阅读说明：本技术 制备陶瓷纤维竖式熔制炉专用焦的方法和陶瓷纤维竖式熔制炉专用焦及其应用 (Method for preparing special coke for ceramic fiber vertical melting furnace, special coke for ceramic fiber vertical melting furnace and application of special coke ) 是由 孙占龙 赵宝龙 于 2021-01-19 设计创作，主要内容包括：本发明涉及陶瓷纤维竖式熔制炉专用焦生产技术领域,具体公开一种制备陶瓷纤维竖式熔制炉专用焦的方法和陶瓷纤维竖式熔制炉专用焦及其应用,该方法包括,将配合煤、粘结剂和增块剂进行干馏；其中,所述增块剂具有如下粒径分布：以增块剂的总量为基准,粒径≤0.1mm的部分占1-6重量％,粒径在0.1-0.5mm的部分占54-69重量％,粒径在0.5mm-1mm的部分占30-35重量％,粒径＞1mm的部分不超过5重量％。本发明在保证陶瓷纤维竖式熔制炉专用焦质量的情况下,能够提升陶瓷纤维竖式熔制炉专用焦大块焦(粒径≥80mm)产率,其他指标满足陶瓷纤维用焦标准。(The invention relates to the technical field of production of special coke for a ceramic fiber vertical melting furnace, and particularly discloses a method for preparing the special coke for the ceramic fiber vertical melting furnace, the special coke for the ceramic fiber vertical melting furnace and application thereof, wherein the method comprises the steps of performing dry distillation on blended coal, a binder and an additive; wherein the block additive has the following particle size distribution: based on the total amount of the anticaking agent, the part with the particle diameter of less than or equal to 0.1mm accounts for 1-6 wt%, the part with the particle diameter of 0.1-0.5mm accounts for 54-69 wt%, the part with the particle diameter of 0.5-1mm accounts for 30-35 wt%, and the part with the particle diameter of more than 1mm does not exceed 5 wt%. Under the condition of ensuring the quality of the coke special for the ceramic fiber vertical melting furnace, the method can improve the yield of the coke bulk coke (the grain diameter is more than or equal to 80mm) special for the ceramic fiber vertical melting furnace, and other indexes meet the standard of the coke for the ceramic fiber.)

1. A method for preparing the special coke of vertical melting furnace of ceramic fiber, said method comprises, carry on the dry distillation to mix coal, agglomerant and anticaking agent; wherein the block additive has the following particle size distribution:

based on the total amount of the anticaking agent, the part with the particle diameter of less than or equal to 0.1mm accounts for 1-6 wt%, the part with the particle diameter of 0.1-0.5mm accounts for 54-69 wt%, the part with the particle diameter of 0.5-1mm accounts for 30-35 wt%, and the part with the particle diameter of more than 1mm does not exceed 5 wt%.

2. The process according to claim 1, wherein the fraction having a particle size of 0.1 to 0.3mm is 14 to 34% by weight and the fraction having a particle size of 0.3 to 0.5mm is 35 to 40% by weight, based on the total amount of the block additive;

preferably, the part with the particle diameter of 0.1-0.2mm accounts for 11-32 wt% and the part with the particle diameter of 0.2-0.3mm accounts for 2-3 wt% based on the total amount of the anticaking agent;

preferably, the portion with the particle diameter of 0.3-0.4mm accounts for 15-21 wt% and the portion with the particle diameter of 0.4-0.5mm accounts for 19-25 wt% based on the total amount of the anticaking agent;

preferably, the portion with the particle diameter of less than or equal to 0.074mm accounts for 0-3 wt% and the portion with the particle diameter of 0.074-0.1mm accounts for 1-3 wt% of the total amount of the anticaking agent.

3. The process of claim 1 or 2, wherein the anticaking agent is petroleum coke;

preferably, the anticaking agent is at least one of calcined petroleum coke, semi-graphitized petroleum coke and graphitized petroleum coke;

preferably, the anti-caking agent satisfies: ash content is less than or equal to 1 wt%, sulfur content is less than or equal to 0.45 wt%, volatile matter is less than or equal to 1.2 wt%, and water content is less than 0.1 wt%.

4. The method of any one of claims 1-3, wherein the blended coal has a particle size distribution as follows:

based on the total amount of the blended coal, the part with the particle size of less than or equal to 0.5mm accounts for 5-10 wt%, the part with the particle size of 0.5-2mm accounts for 85-95 wt%, and the part with the particle size of 2-3mm accounts for 0-5 wt%;

preferably, the part with the particle diameter of 0.5-1mm accounts for 35-75 wt% and the part with the particle diameter of 1-2mm accounts for 20-50 wt% based on the total amount of the blended coal;

preferably, the blended coal is at least one of coking coal, 1/3 coking coal, lean coal, fat coal, gas coal, long flame coal, weakly caking coal and anthracite;

preferably, the blended coal comprises coking coal, fat coal, 1/3 coking coal and lean coal;

preferably, based on the total amount of blended coal, the content of the coking coal is 40-85 wt%, the content of the fat coal is 10-15 wt%, the content of the 1/3 coking coal is 0-30 wt%, and the content of the lean coal is 5-15 wt%.

5. The method of any of claims 1-4, wherein the binder has a particle size distribution of:

based on the total amount of the binder, the part with the particle size of less than or equal to 0.1mm accounts for 0-10 wt%, the part with the particle size of 0.1-1mm accounts for 70-100 wt%, and the part with the particle size of 1-1.5mm accounts for 0-20 wt%;

preferably, the fraction having a particle size of 0.1 to 0.5mm is 20 to 50% by weight and the fraction having a particle size of 0.5 to 1mm is 50 to 80% by weight, based on the total amount of the binder.

6. The method of any of claims 1-5, wherein the binder is at least one of coal pitch, coal tar, and petroleum pitch;

preferably, the binder satisfies: ash content is less than or equal to 2 wt%, sulfur content is less than or equal to 2 wt%, volatile matter is 40-60 wt%, softening point is 100-;

preferably, the binder satisfies: 25-30 wt% of beta resin, 63-72 wt% of gamma resin and 3-7 wt% of alpha resin.

7. The process of any one of claims 1-6, wherein the weight ratio of the blended coal, binder and anticaking agent is from 85-93:2 to 10: 1-10;

preferably, the weight ratio of the blended coal to the binder to the caking agent is 100:2-12: 1-12.

8. The method according to any of claims 1-7, wherein the retorting comprises: firstly, heating to the required dry distillation temperature, and then carrying out constant-temperature dry distillation;

preferably, the dry distillation temperature is 950-;

preferably, the constant-temperature dry distillation time is 160-190 h;

preferably, the rate of heating up is 0.5-1.2 ℃/min;

preferably, the heating process includes: heating from room temperature;

alternatively, the temperature rise heating is started in an environment of 700-750 ℃.

9. The special coke for the vertical melting furnace of the ceramic fiber prepared by the method of any one of claims 1 to 8.

10. Use of the special coke for the ceramic fiber vertical melting furnace of claim 9 for producing ceramic fibers.

Technical Field

The invention relates to the technical field of production of special coke for a ceramic fiber vertical melting furnace, in particular to a method for preparing special coke for the ceramic fiber vertical melting furnace, the special coke for the ceramic fiber vertical melting furnace and application thereof.

Background

Ceramic fibers are a new generation of inorganic heat insulating materials emerging in recent years, and due to their nonflammable properties, the amount of ceramic fibers used is rapidly increasing as green and environmentally friendly building materials, and ceramic fibers are also widely used in the fields of agricultural planting, industrial heat insulation, ship manufacturing, sound insulation, and the like. The ceramic fiber products are made of high-quality basalt, dolomite and the like as main raw materials, are melted at a high temperature of over 1450 ℃, are subjected to high-speed centrifugation by an international advanced four-shaft centrifuge to form fibers, are sprayed with a certain amount of binder, dustproof oil and water repellent, are collected by a cotton collecting machine, are subjected to a pendulum bob process, are paved by a three-dimensional method, and are solidified and cut to form ceramic fiber products with different specifications and purposes.

The equipment for producing the ceramic fiber is generally a vertical melting furnace which is a vertical hearth and is called as the vertical melting furnace because the opening of the furnace top is upward; the feeding was carried out as a continuous feed. The production of the ceramic fiber, the most important is the stable furnace conditions, wherein the material level in the furnace is stable, and the temperature in the furnace can ensure that the melt flows out of the melting furnace at low viscosity (10 poise) (the melt temperature is 1400 ℃ C. and 1500 ℃ C.). In order to achieve the above conditions, the composition of the raw materials, the quality and quantity of the coke specially used for the vertical melting furnace for ceramic fibers, the blast temperature, the blast volume and the like are factors influencing the stable operation of the melting furnace. In a vertical furnace that is stable in operation, there is a balance between raw materials, fuel and blast air, which is the most important factor in the overall furnace system. To achieve this balance, it is necessary to ensure the proper size and porosity of the raw materials. In production, the chemical composition, granularity, impurity content and the like of raw materials need to be controlled, and the special coke for the vertical melting furnace of the cast ceramic fiber with high heat value, uniform granularity and high mechanical strength is generally used as fuel.

The quality parameters of the coke for the existing ceramic fiber are as follows: calorific value > 7000Kcal/Kg, crushing strength: m40 is more than 87 percent, the abrasion resistance is M10 less than 10 percent, the fixed carbon content is more than 88 percent by weight, the ash content is less than 8 percent by weight, the volatile content is less than 1 percent by weight, the sulfur content is less than 0.6 percent by weight, and the water content is less than 2 percent by weight; granularity: the most preferred range is 80-140mm, the particle sizes > 140mm and < 80mm amounting to not more than 10% by weight. The above partial quality parameters refer to the top grade coke standard in GB/T8729-2017 foundry coke standard, and indexes such as heat value, strength, fixed carbon, ash content, volatile matter, sulfur, water and the like are relatively easy to realize.

However, in the existing production process, the particle size of the special coke for the ceramic fiber vertical melting furnace is difficult to control within the optimal particle size distribution range of the coke for the ceramic fiber, and the manufacturers of the special coke for the ceramic fiber vertical melting furnace can only sell the ceramic fiber coke according to the particle size ratio after sieving and grading the particle size of the special coke for the ceramic fiber vertical melting furnace. In the existing production process, the yield of the coke special for the ceramic fiber vertical melting furnace with the particle size of more than or equal to 80mm can only be maintained at about 70 percent, the requirement of the vertical melting furnace for ceramic fiber production on the use specification of the particle size of the coke special for the ceramic fiber vertical melting furnace is not met, the improvement of the coke discharging bulk rate is a technical problem which is urgently needed to be solved by the coke manufacturer special for the ceramic fiber vertical melting furnace at present, and the method is also an effective way for reducing the cost of the coke for the ceramic fiber.

Disclosure of Invention

The invention aims to overcome the defects that the conventional method for producing the special coke for the ceramic fiber vertical melting furnace in the prior art is low in coke discharging block rate, the yield of products with the particle size of more than or equal to 80mm is about 70 percent, and the requirement of the vertical melting furnace for ceramic fiber production on the special coke particle size use specification of the vertical melting furnace for ceramic fiber production is not met, and provides a method for preparing the special coke for the ceramic fiber vertical melting furnace, the special coke for the ceramic fiber vertical melting furnace and application thereof.

In order to achieve the above object, the present invention provides in a first aspect a method for producing a coke specifically for use in a vertical melting furnace for ceramic fibers, comprising dry distilling blended coal, a binder and an anticaking agent; wherein the block additive has the following particle size distribution:

based on the total amount of the anticaking agent, the part with the particle diameter of less than or equal to 0.1mm accounts for 1-6 wt%, the part with the particle diameter of 0.1-0.5mm accounts for 54-69 wt%, the part with the particle diameter of 0.5-1mm accounts for 30-35 wt%, and the part with the particle diameter of more than 1mm does not exceed 5 wt%.

The second aspect of the invention provides the special coke for the vertical melting furnace for ceramic fibers prepared by the method of the first aspect.

In a third aspect, the invention provides the use of the coke specially used for the vertical melting furnace of ceramic fibers described in the second aspect in the production of ceramic fibers.

According to the invention, by adopting the coal blending, introducing the anticaking agent with specific particle size distribution and matching with other technical characteristics, under the condition of ensuring the quality of the special coke for the ceramic fiber vertical melting furnace, the yield of the special coke bulk coke (the particle size is more than or equal to 80mm) for the ceramic fiber vertical melting furnace can be improved, and other indexes meet the standard of the special coke for the ceramic fiber; the method has simple process, no need of new equipment, and low coal blending cost. The inventors have found that, under the same conditions, when the particle size distribution of the caking additive does not satisfy the above conditions, the coke-forming lump ratio is low.

Detailed Description

The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.

The invention provides a method for preparing special coke for a vertical melting furnace for ceramic fibers, which comprises the steps of performing dry distillation on blended coal, a binder and an additive agent; wherein the block additive has the following particle size distribution:

based on the total amount of the anticaking agent, the part with the particle diameter of less than or equal to 0.1mm accounts for 1-6 wt%, the part with the particle diameter of 0.1-0.5mm accounts for 54-69 wt%, the part with the particle diameter of 0.5-1mm accounts for 30-35 wt%, and the part with the particle diameter of more than 1mm does not exceed 5 wt%.

In the present invention, the fraction having a particle size of A-Bmm means a fraction having a particle size of > Amm and < Bmm; for example, the fraction having a particle size of 0.1 to 0.5mm means a fraction having a particle size of > 0.1mm and < 0.5 mm. In the invention, the particle size distribution is obtained by testing with a Dandongbaut laser particle sizer BT-9300S.

According to the invention, the proportion of particles having a diameter of 0.1 to 0.3mm is preferably from 14 to 34% by weight and the proportion of particles having a diameter of 0.3 to 0.5mm is preferably from 35 to 40% by weight, based on the total amount of the antiblocking agent. By adopting the preferred scheme of the invention, the regulation and control effect on the yield of the special coke lump coke (the grain diameter is more than or equal to 80mm) for the ceramic fiber vertical melting furnace can be further fully exerted.

According to the invention, it is further preferred that the fraction having a particle size of from 0.1 to 0.2mm is from 11 to 32% by weight and the fraction having a particle size of from 0.2 to 0.3mm is from 2 to 3% by weight, based on the total amount of the block-enhancing agent.

According to the invention, it is further preferred that the fraction having a particle size of from 0.3 to 0.4mm is from 15 to 21% by weight and the fraction having a particle size of from 0.4 to 0.5mm is from 19 to 25% by weight, based on the total amount of the antiblocking agent.

According to the invention, it is preferred that the proportion of particles having a particle size of 0.074mm or less is 0 to 3% by weight and the proportion of particles having a particle size of 0.074 to 0.1mm is 1 to 3% by weight, based on the total amount of the block-enhancing agent.

According to a preferred embodiment of the invention, the block additive has the following particle size distribution:

based on the total amount of the anticaking agent, the part with the particle diameter of less than or equal to 0.074mm accounts for 0-3 wt%, the part with the particle diameter of 0.074-0.1mm accounts for 1-3 wt%, the part with the particle diameter of 0.1-0.2mm accounts for 11-32 wt%, the part with the particle diameter of 0.2-0.3mm accounts for 2-3 wt%, the part with the particle diameter of 0.3-0.4mm accounts for 15-20 wt%, the part with the particle diameter of 0.4-0.5mm accounts for 20-25 wt%, the part with the particle diameter of more than 0.5mm accounts for 30-35 wt%, and the part with the particle diameter of more than 1mm does not exceed 5 wt%. By adopting the preferable scheme of the invention, the function of the caking agent can be fully exerted, and the yield of the bulk coke with the particle size of more than 80mm is improved.

The selectable range of the caking agent is wider, and the caking agent is beneficial to improving the yield of large coke with the particle size of more than 80 mm; preferably, the anticaking agent is petroleum coke.

According to the present invention, preferably, the anticaking agent is at least one of calcined petroleum coke, semi-graphitized petroleum coke and graphitized petroleum coke. In the invention, the calcined petroleum coke, the semi-graphitized petroleum coke and the graphitized petroleum coke have the conventional definitions in the field and are not described herein again; the semi-graphitized petroleum coke and the graphitized petroleum coke are resistance materials or heat preservation materials in the production process of Acheson furnace graphitized electrodes or graphite cathode materials, and belong to tailings of the Acheson furnace graphitizing process; can be obtained by commercial production or actual production.

According to the invention, preferably, the block-increasing agent satisfies: ash content is less than or equal to 1 wt%, sulfur content is less than or equal to 0.45 wt%, volatile matter is less than or equal to 1.2 wt%, and water content is less than 0.1 wt%.

In a preferred embodiment of the present invention, the blended coal has the following particle size distribution:

based on the total amount of the blended coal, the part with the particle size of less than or equal to 0.5mm accounts for 5-10 wt%, the part with the particle size of 0.5-2mm accounts for 85-95 wt%, and the part with the particle size of 2-3mm accounts for 0-5 wt%. The inventor further researches and discovers that the yield of the special coke lump coke (the grain diameter is more than or equal to 80mm) for the ceramic fiber vertical melting furnace can be further improved by controlling the grain diameter distribution of the blended coal.

More preferably, according to the present invention, the fraction having a particle size of 0.5 to 1mm is 35 to 75% by weight and the fraction having a particle size of 1 to 2mm is 20 to 50% by weight, based on the total amount of blended coal. Under the preferred scheme, the method can further fully play a role in regulating and controlling the yield of the special coke lump coke (the grain diameter is more than or equal to 80mm) for the ceramic fiber vertical melting furnace.

In the present invention, preferably, the blended coal is at least one of coking coal, 1/3 coking coal, lean coal, fat coal, gas coal, long flame coal, weakly caking coal, and anthracite.

In a preferred embodiment of the present invention, the blended coal includes coking coal, fat coal, 1/3 coking coal and lean coal. Under the preferred scheme, the special coke for the ceramic fiber vertical melting furnace, which meets the standard of the coke for ceramic fiber, can be prepared, and the coal blending cost can be further reduced.

According to the present invention, preferably, the content of the coking coal is 40-85 wt%, the content of the fat coal is 10-15 wt%, the content of the 1/3 coking coal is 0-30 wt%, and the content of the lean coal is 5-15 wt% based on the total amount of the blended coal.

According to the invention, preferably, coke powder can be also introduced into the blended coal, and the content of the coke powder in the blended coal is 0-10 wt%, more preferably 1-5 wt%. In the present invention, the coke powder has the conventional meaning in the art, and can be obtained commercially or in production, and is not described herein again.

According to the present invention, preferably, the binder has the following particle size distribution:

based on the total amount of the binder, the part with the particle size of less than or equal to 0.1mm accounts for 0-10 wt%, the part with the particle size of 0.1-1mm accounts for 70-100 wt%, and the part with the particle size of 1-1.5mm accounts for 0-20 wt%. The inventor further researches and discovers that the yield of the special coke block coke (the grain diameter is more than or equal to 80mm) for the ceramic fiber vertical melting furnace can be further improved by controlling the grain diameter distribution of the binder.

More preferably, the fraction having a particle size of 0.1 to 0.5mm is 20 to 50% by weight and the fraction having a particle size of 0.5 to 1mm is 50 to 80% by weight, based on the total amount of the binder. Under the preferred scheme, the method can further fully play a role in regulating and controlling the yield of the special coke lump coke (the grain diameter is more than or equal to 80mm) for the ceramic fiber vertical melting furnace.

According to the invention, the selectable range of the adhesive is wide; preferably, the binder is at least one of coal pitch, coal tar and petroleum pitch. The softening point of the coal tar pitch is preferably 100 ℃ to 170 ℃.

Preferably, the binder satisfies: ash content is less than or equal to 2 wt%, sulfur content is less than or equal to 2 wt%, volatile matter is 40-60 wt%, softening point is 100-. In the present invention, the moisture content of the binder is preferably < 1% by weight.

According to the invention, the composition of the binder can be selected within a wide range, and preferably the binder satisfies: 25-30 wt% of beta resin, 63-72 wt% of gamma resin and 3-7 wt% of alpha resin. The inventor researches and discovers that by adopting the preferable scheme of the invention, the yield of the special coke bulk coke (the grain diameter is more than or equal to 80mm) for the ceramic fiber vertical smelting furnace can be further improved, and the reactivity and the strength of the special coke for the ceramic fiber vertical smelting furnace can be further improved; whereas the prior art has a beta resin content of generally below 20 wt.%.

In the invention, the moisture, ash content, softening point, coking value and extraction components (beta resin, gamma resin and alpha resin) are measured according to GB/T2290-2012, the volatile components are measured according to GB/T2290-94, and the sulfur content is measured by coulometry according to GB/T214-2007.

According to the invention, the weight ratio of the blended coal, the binder and the caking agent is preferably 85-93:2-10: 1-10.

More preferably, the weight ratio of the blended coal, the binder and the caking agent is 100:2-12: 1-12. Under the preferred scheme, the yield of the special coke lump coke (the grain diameter is more than or equal to 80mm) for the ceramic fiber vertical melting furnace can be further improved.

In the present invention, preferably, the method further comprises: mixing the blended coal and the binder to obtain a mixture, optionally mixing the mixture with the anticaking agent, and performing dry distillation. The "optional mixing with the anticaking agent" and the dry distillation may be carried out simultaneously or sequentially in steps.

In the invention, the G value (caking index) of the mixture is 65-75, and the Y value (maximum gelatinous layer thickness) is 10-15 mm.

According to the invention, the optional range of the dry distillation is wider, and the yield of the special coke bulk coke (the grain diameter is more than or equal to 80mm) for the ceramic fiber vertical melting furnace is improved; preferably, the process of retorting comprises: firstly heating to the required dry distillation temperature, and then carrying out constant temperature dry distillation. Under the preferred scheme, the yield of the special coke lump coke (the grain diameter is more than or equal to 80mm) for the ceramic fiber vertical melting furnace can be improved.

In the invention, the dry distillation temperature is preferably 950-. The inventor researches and finds that the preferable scheme can be beneficial to the yield of the large lump coke.

In the invention, the selectable range of the constant-temperature dry distillation time is wider, and the technical personnel in the field can be adaptively adjusted by combining the application of the special coke for the ceramic fiber vertical melting furnace; the special coke for the vertical melting furnace for the ceramic fiber is particularly suitable for the ceramic fiber, and preferably, the constant-temperature dry distillation time is 160-190 h.

According to the invention, the optional range of the heating rate is wide, and the yield of the special coke bulk coke (the grain diameter is more than or equal to 80mm) for the ceramic fiber vertical melting furnace can be improved; preferably, the rate of heating at elevated temperature is 0.5-1.2 ℃/min.

In the present invention, preferably, the temperature raising and heating process includes: heating from room temperature;

alternatively, the temperature rise heating is started in an environment of 700-750 ℃. In the present invention, the room temperature means 25. + -. 5 ℃. The inventor researches and discovers that the two optimal schemes can be beneficial to fully exerting the regulation and control function on the yield of the special coke lump coke (the grain diameter is more than or equal to 80mm) for the vertical melting furnace of the ceramic fiber. In the invention, the starting of heating at 700-750 ℃ environment refers to heating the material at 700-750 ℃.

According to a preferred embodiment of the present invention, the method for preparing the coke specially used for the vertical melting furnace of the ceramic fiber comprises the steps of performing dry distillation on blended coal, a binder and an anticaking agent; the weight ratio of the blended coal to the binder to the caking agent is 100:2-12: 1-12; the dry distillation process comprises the following steps: firstly, heating to the required dry distillation temperature, and then carrying out constant-temperature dry distillation;

wherein the block additive has the following particle size distribution:

based on the total amount of the anticaking agent, the part with the particle diameter of less than or equal to 0.1mm accounts for 1-6 wt%, the part with the particle diameter of 0.1-0.5mm accounts for 54-69 wt%, the part with the particle diameter of 0.5-1mm accounts for 30-35 wt%, and the part with the particle diameter of more than 1mm does not exceed 5 wt%;

the blended coal has the following particle size distribution:

based on the total amount of the blended coal, the part with the particle size of less than or equal to 0.5mm accounts for 5-10 wt%, the part with the particle size of 0.5-2mm accounts for 85-95 wt%, and the part with the particle size of 2-3mm accounts for 0-5 wt%;

the binder has the following particle size distribution:

based on the total amount of the binder, the part with the particle size of less than or equal to 0.1mm accounts for 0-10 wt%, the part with the particle size of 0.1-1mm accounts for 70-100 wt%, and the part with the particle size of 1-1.5mm accounts for 0-20 wt%. By adopting the preferred scheme of the invention, the regulation and control function of the yield of the special coke bulk coke (the grain diameter is more than or equal to 80mm) for the ceramic fiber vertical smelting furnace can be fully exerted, so that the yield improvement degree of the special coke bulk coke (the grain diameter is more than or equal to 80mm) for the ceramic fiber vertical smelting furnace is higher.

According to a particularly preferred embodiment of the present invention, the method for preparing the coke specially used for the vertical melting furnace of the ceramic fiber comprises the steps of performing dry distillation on blended coal, a binder and an anticaking agent; the weight ratio of the blended coal to the binder to the caking agent is 100:4-6: 7-8; the dry distillation process comprises the following steps: firstly, heating to the required dry distillation temperature, and then carrying out constant-temperature dry distillation;

wherein the block additive has the following particle size distribution:

based on the total amount of the anticaking agent, the part with the particle diameter of less than or equal to 0.074mm accounts for 0-3 wt%, the part with the particle diameter of 0.074-0.1mm accounts for 1-3 wt%, the part with the particle diameter of 0.1-0.2mm accounts for 11-32 wt%, and the part with the particle diameter of 0.2-0.3mm accounts for 2-3 wt%; 15-21 wt% of the fraction with particle size of 0.3-0.4mm, 19-25 wt% of the fraction with particle size of 0.4-0.5mm, 30-35 wt% of the fraction with particle size of more than 0.5mm, and not more than 5 wt% of the fraction with particle size of more than 1 mm;

the blended coal has the following particle size distribution:

based on the total amount of the blended coal, the part with the particle size of less than or equal to 0.5mm accounts for 5-10 wt%, the part with the particle size of 0.5-1mm accounts for 35-75 wt%, the part with the particle size of 1-2mm accounts for 20-50 wt%, and the part with the particle size of 2-3mm accounts for 0-5 wt%;

the binder satisfies: 25-30 wt% of beta resin, 63-72 wt% of gamma resin and 3-7 wt% of alpha resin; and the binder has the following particle size distribution:

based on the total amount of the binder, the part with the particle size of less than or equal to 0.1mm accounts for 0-10 wt%, the part with the particle size of 0.1-0.5mm accounts for 20-50 wt%, the part with the particle size of 0.5-1mm accounts for 50-80 wt%, and the part with the particle size of 1-1.5mm accounts for 0-20 wt%. By adopting the preferred scheme of the invention, the regulation and control function of the yield of the special coke bulk coke (the grain diameter is more than or equal to 80mm) for the ceramic fiber vertical smelting furnace can be fully exerted, so that the yield improvement degree of the special coke bulk coke (the grain diameter is more than or equal to 80mm) for the ceramic fiber vertical smelting furnace is better.

The second aspect of the invention provides the special coke for the vertical melting furnace for ceramic fibers prepared by the method of the first aspect. In the special coke for the ceramic fiber vertical melting furnace, the yield of products with the particle size of more than or equal to 80mm is improved, and the requirement of the vertical melting furnace for ceramic fiber production on the use specification of the particle size of the special coke for the ceramic fiber vertical melting furnace is met; meanwhile, the quality of the coke special for the vertical melting furnace for the ceramic fiber meets the quality of the coke for the ceramic fiber.

In a third aspect, the invention provides the use of the coke specially used for the vertical melting furnace of ceramic fibers described in the second aspect in the production of ceramic fibers.

The present invention will be described in detail below by way of examples. Wherein, the contents of moisture, ash and extraction components (beta resin, gamma resin and alpha resin), softening point and coking value are measured according to GB/T2290-2012, the volatile matter is measured according to GB/T2290-94, and the sulfur content is measured by adopting Coulomb titration method and referring to GB/T214-2007; the particle size distribution was measured by the Dandongbaut laser granulometer BT-9300S test. In the following examples, Xinjing, Xinyuan, Xinjiang 2#, Xinjiang 9+10#, and coke powder were purchased from Shanxi Qin New energy group, Inc.

The coal pitch (β resin content 26.2 wt%, γ resin content 68.9 wt%, and α resin content 4.9 wt%) was obtained from shenhua reduos coal oil production, and had an ash content of 0.68 wt%, a sulfur content of 0.22 wt%, a volatile matter content of 44.45 wt%, a softening point of 172 ℃, and a coking value of 66.52%.

The graphitized petroleum coke is from Shandong sunshine Cross bridge trade company, and has ash content of 0.66 wt%, sulfur content of 0.34 wt%, volatile component of 0.86 wt% and water content of 0 wt%.

The semi-graphitized petroleum coke is from a new science and technology division of Shanxi Qin New energy group, and comprises 0.93 wt% of ash, 0.3 wt% of sulfur, 1.19 wt% of volatile matter and 0.05 wt% of water.

The calcined petroleum coke is obtained from a Jinzhou petrochemical refinery, and the raw coke is calcined at 1400 ℃, and has 0.78 wt% of ash, 0.41 wt% of sulfur, 0.28 wt% of volatile components and 0.04 wt% of moisture.

Example 1

Firstly, mixing the blended coal and the binder to obtain a mixture, and then sequentially mixing and performing dry distillation on the mixture and the anticaking agent to obtain the special coke for the ceramic fiber vertical melting furnace; the dry distillation process comprises the following steps: heating to 950 deg.C (i.e. dry distillation temperature) at 1 deg.C/min from room temperature, and performing constant temperature dry distillation for 190 h. The weight ratio of the blended coal to the binder to the caking agent is 100:5:7.

Wherein, the composition of the blended coal is as follows: 49.5 wt% new well (i.e., coking coal), 28.5 wt% new source (i.e., 1/3 coking coal), 12 wt% new liter # 2 (i.e., fat coal), 6 wt% new liter # 9+10 (i.e., lean coal), 4 wt% coke fines. The blended coal has a particle size distribution: based on the total amount of the blended coal, the part with the particle size of less than or equal to 0.5mm accounts for 7.6 wt%, the part with the particle size of 0.5-1mm accounts for 57.2 wt%, the part with the particle size of 1-2mm accounts for 31.4 wt%, and the part with the particle size of 2-3mm accounts for 3.8 wt%.

The binder is coal tar pitch, and has the following particle size distribution:

based on the total amount of the binder, the fraction with the particle size of less than or equal to 0.1mm accounts for 4.4 wt%, the fraction with the particle size of 0.1-0.5mm accounts for 32.5 wt%, the fraction with the particle size of 0.5-1mm accounts for 59.6 wt%, and the fraction with the particle size of 1-1.5mm accounts for 3.5 wt%.

The anticaking agent is graphitized petroleum coke; the anticaking agent had the following particle size distribution:

based on the total amount of the anticaking agent, the part with the particle diameter of less than or equal to 0.074mm accounts for 2.99 weight percent, the part with the particle diameter of 0.074-0.1mm accounts for 2.37 weight percent, the part with the particle diameter of 0.1-0.2mm accounts for 21.26 weight percent, the part with the particle diameter of 0.2-0.3mm accounts for 2.75 weight percent, the part with the particle diameter of 0.3-0.4mm accounts for 16.38 weight percent, the part with the particle diameter of 0.4-0.5mm accounts for 19.95 weight percent, and the part with the particle diameter of more than 0.5mm accounts for 34.30 weight percent.

The grain size of the obtained special coke for the vertical melting furnace of the ceramic fiberThe distribution and the yield of the special coke (the grain diameter is more than or equal to 80mm) for the large ceramic fiber vertical melting furnace are shown in table 1. The quality index of the coke specially used for the vertical melting furnace for ceramic fiber obtained by the test is shown in Table 2, wherein ash content (A)_d) Sulfur (S)_td) Crushing strength (M)₄₀) Abrasion resistance (M)₁₀) Reactivity (CRI) and post-reaction strength (CSR) were measured according to GB/T1996-2017 metallurgical coke, and drop strength and apparent porosity (P)_s) Measured according to GB/T8729-2017 foundry coke.

Example 2

The procedure was carried out in analogy to example 1, except that the amount of the antiblocking agent was varied and was 7.5% by weight relative to the coal blend. The test results are shown in tables 1 and 2.

Example 3

The procedure was carried out in analogy to example 1, except that the amount of the antiblocking agent was varied and was 7.2% by weight relative to the coal blend. The test results are shown in tables 1 and 2.

Example 4

The procedure was carried out analogously to example 1, except that:

mixing the blended coal and the binder (coal tar) to obtain a mixture, mixing the mixture with the anticaking agent (semi-graphitized petroleum coke), and performing dry distillation to obtain the special coke for the ceramic fiber vertical melting furnace; the dry distillation process comprises the following steps: heating to 950 deg.C (i.e. dry distillation temperature) at 0.8 deg.C/min from 700 deg.C, and dry distilling at constant temperature for 160 h. The weight ratio of the blended coal to the binder to the caking agent is 100:5: 7.5.

Wherein, the composition of the blended coal is as follows: 60.5 wt% new well (i.e., coking coal), 17.5 wt% new source (i.e., 1/3 coking coal), 10 wt% new liter # 2 (i.e., fat coal), 12 wt% new liter # 9+10 (i.e., lean coal).

Example 5

The procedure was carried out analogously to example 1, except that:

mixing the blended coal and the binder (coal tar pitch) to obtain a mixture, mixing the mixture with an anticaking agent (calcined petroleum coke) and then carrying out dry distillation to obtain the special coke for the ceramic fiber vertical melting furnace; the dry distillation process comprises the following steps: heating to 1000 deg.C (i.e. dry distillation temperature) at 0.9 deg.C/min from 700 deg.C, and performing constant temperature dry distillation for 190 h. The weight ratio of the blended coal to the binder to the caking agent is 100:5: 7.5.

Wherein, the composition of the blended coal is as follows: 63% by weight of virgin well (i.e., coking coal), 7% by weight of virgin source (i.e., 1/3 coking coal), 15% by weight of virgin 2# (i.e., fat coal), and 15% by weight of virgin 9+10# (i.e., lean coal).

Example 6

The procedure was carried out in a similar manner to example 1, except that the distribution of the portion of the block additive having a particle diameter of 0.1 to 0.5mm was varied, specifically, the portion having a particle diameter of 0.1 to 0.3mm accounted for 50% by weight and the portion having a particle diameter of 0.3 to 0.5mm accounted for 10.34% by weight, based on the total amount of the block additive. The test results are shown in table 2.

Example 7

The procedure was carried out in a similar manner to example 1, except that the distribution of the portion of the block having a particle diameter of from 0.1 to 0.3mm was varied, specifically, the portion having a particle diameter of from 0.1 to 0.2mm accounted for 2.75% by weight and the portion having a particle diameter of from 0.2 to 0.3mm accounted for 21.26% by weight, based on the total amount of the block. The test results are shown in table 2.

Example 8

The procedure was carried out in a similar manner to example 1, except that the distribution of the portion of the block additive having a particle diameter of from 0.3 to 0.5mm was varied, specifically, the portion having a particle diameter of from 0.3 to 0.4mm accounted for 25% by weight and the portion having a particle diameter of from 0.4 to 0.5mm accounted for 11.33% by weight, based on the total amount of the block additive. The test results are shown in table 2.

Example 9

The procedure was carried out in a similar manner to that in example 1 except that the blended coal had a different particle size distribution, specifically, the fraction having a particle size of 0.5mm or less accounted for 3.5% by weight, the fraction having a particle size of 0.5 to 1mm accounted for 18.7% by weight, the fraction having a particle size of 1 to 2mm accounted for 15.5% by weight, and the fraction having a particle size of 2 to 3mm accounted for 62.3% by weight, based on the total amount of the blended coal. The test results are shown in table 2.

Example 10

The procedure was carried out in a similar manner to example 1, except that the particle size distribution of the binder was varied, specifically, based on the total amount of the binder, 67% by weight of the fraction having a particle size of 0.1mm or less, 15.5% by weight of the fraction having a particle size of 0.1 to 0.5mm, 13.8% by weight of the fraction having a particle size of 0.5 to 1.5mm and 3.7% by weight of the fraction having a particle size of 1 to 1.5mm were used. The test results are shown in table 2.

Example 11

The procedure was carried out in a similar manner to example 1, except that the binder was different, specifically, the binder was a coal-based modified asphalt (available from Shanxi coking group Co., Ltd.) satisfying: the beta resin content was 20 wt%, the gamma resin content was 72.5 wt%, and the alpha resin content was 7.5 wt%.

Comparative example 1

The procedure was carried out analogously to example 1, except that the particle size distribution of the antiblocking agent was different, in particular the antiblocking agent had the following particle size distribution: based on the total amount of the anticaking agent, 95.88 wt% of the part with particle diameter of less than or equal to 0.1mm, 2.37 wt% of the part with particle diameter of 0.1-0.5mm, and 1.75 wt% of the part with particle diameter of more than 0.5 mm.

Comparative example 2

The procedure was carried out analogously to example 1, except that the particle size distribution of the antiblocking agent was different, in particular the antiblocking agent had the following particle size distribution: based on the total amount of the anticaking agent, the part with the particle diameter of less than or equal to 0.1mm accounts for 5.87 weight percent, the part with the particle diameter of 0.1-0.5mm accounts for 13.75 weight percent, and the part with the particle diameter of more than 0.5mm accounts for 80.38 weight percent.

TABLE 1

TABLE 2

As can be seen from the results in tables 1 and 2, the embodiment of the invention has a significantly better large block rate and other comprehensive properties; while other conditions are the same, the solution without the specific particle size distribution of the present invention is significantly less effective, especially in terms of bulk fraction.

Among them, it can be seen from comparative example 1 and examples 6 to 8 that a more preferable effect can be obtained by adopting the technical scheme of the present invention in which the caking agent having a specific particle size distribution is preferable. It can be seen from comparison of example 1 and example 9 that better effects can be obtained by employing the preferred specific particle size distribution of the blended coal of the present invention. It can be seen from comparison of example 1 and example 10 that a better effect can be obtained by using the binder of the present invention in which a specific particle size distribution is preferred. It can be seen from comparison of example 1 and example 11 that better results can be obtained with the binder of the present invention preferably having a specific composition.

The preferred embodiments of the present invention have been described above in detail, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention, including combinations of various technical features in any other suitable way, and these simple modifications and combinations should also be regarded as the disclosure of the invention, and all fall within the scope of the invention.