阅读说明：本技术 一种易下浮的速溶增碳剂及其制备方法 (Instant carburant easy to float downwards and preparation method thereof ) 是由 王顺瑞 王峰 于 2019-09-26 设计创作，主要内容包括：本发明公开了一种易下浮的速溶增碳剂,包括人造晶体石墨、石油焦粉和生铁,粒度在60-65μm,包括如下重量份数比：人造晶体石墨的含量70-80g、石油焦粉的含量为20-30g和生铁的含量为4-8g。一种易下浮的速溶增碳剂的制备方法,采用了速溶增碳剂在里面加入的生铁,使其比重增加,不易上浮,并且在铁水中极易熔化,铁的熔点低,熔化吸收时间仅有常见增碳剂的五分之一,达到了快速增碳的目地。解决了当前在出炉前补充碳量的难题。(The invention discloses an easy-floating instant carburant, which comprises artificial crystal graphite, petroleum coke powder and pig iron, wherein the granularity is 60-65 mu m, and the grain size comprises the following components in parts by weight: 70-80g of artificial crystal graphite, 20-30g of petroleum coke powder and 4-8g of pig iron. The preparation method of the instant carburant easy to float downwards adopts the pig iron added in the instant carburant, so that the proportion of the pig iron is increased, the pig iron is difficult to float upwards, the pig iron is easy to melt in molten iron, the melting point of the iron is low, the melting and absorption time is only one fifth of that of the common carburant, and the aim of rapid carburant is achieved. The problem of supplementing carbon amount before discharging is solved.)

1. The easy-floating instant carburant is characterized by comprising artificial crystal graphite, petroleum coke powder and pig iron, wherein the granularity is 60-65 mu m, and the quick-floating instant carburant comprises the following components in parts by weight: 70-80g of artificial crystal graphite, 20-30g of petroleum coke powder and 4-8g of pig iron.

2. The instant recarburizer according to claim 1, wherein the artificial crystal graphite, the petroleum coke powder and the pig iron have a particle size of not more than 64 μm and comprise the following components in parts by weight: 75g of artificial crystal graphite, 25g of petroleum coke powder and 6g of pig iron.

3. The instant recarburizer according to claim 1, wherein the artificial crystal graphite, the petroleum coke powder and the pig iron have a particle size of not more than 62 μm and comprise the following components in parts by weight: 80g of artificial crystal graphite, 30g of petroleum coke powder and 8g of pig iron.

4. The preparation method of the easy-floating instant carburant is characterized by comprising the following steps:

s1: weighing 70-80g of artificial crystal graphite and 20-30g of petroleum coke powder, pouring the artificial crystal graphite and the petroleum coke powder into an open container, wherein the speed of a stirrer in the container is 20-30r/min, the temperature is raised to 70-74 ℃, weighing 50-60g of electrode powder, and pouring 100-120g of charcoal powder into the open container, wherein the speed of the stirrer in the container is 10-20 r/min;

s2: opening the submerged arc furnace, pouring a mixture of artificial crystal graphite and petroleum coke powder from a furnace mouth of the submerged arc furnace, closing a furnace door, burning and heating fuel at the bottom of the furnace, raising the temperature of a catalyst bed layer in the submerged arc furnace to 1300-plus-one 1500 ℃, preserving the heat for 1-1.5h, naturally cooling the submerged arc furnace to room temperature, and sieving the cooled catalyst bed layer with a 210-plus-230-mesh sieve to obtain a graphite raw material;

s3: under the nitrogen atmosphere, heating the graphite raw material from room temperature to 1800 plus 2800 ℃ at the heating rate of 5.0-30.0 ℃/min, preserving the heat for 0.5-30.0h, then naturally cooling the inside of the furnace to the room temperature, and sieving the graphite raw material by a 200-mesh sieve to obtain the graphite material;

s4: the sintering temperature of the graphite material medium-temperature ore-smelting furnace is raised to 2000-;

s5: pouring the raw material prepared in the step S5 into a belt dryer, uniformly spreading the raw material on a 13-14-mesh steel wire mesh, and drying the granulated raw material by hot air through a built-in hot air system in the moving process of the steel wire mesh;

s6: pouring the carburant into a crusher, colliding with a crushing hammer in the crusher at high speed under the action of high-speed centrifugal force, crushing at high density, mutually striking, rubbing and crushing for multiple times, discharging from the lower part of the crusher, and screening the carburant by using a filter screen to obtain the carburant with the granularity of 2-5 mu m.

S7: and pouring the dried granulating raw material into a double-screw granulator, fully plasticizing and melting the granulating raw material in a machine barrel by utilizing the thread space between the double screws during heating, and extruding the granulating raw material by a forming wheel arranged on an extrusion port to obtain the formed carburant.

5. The instant recarburizer according to claim 4, wherein in step S7, the heater for heating by the twin screw uses a three-phase mains frequency alternating current to supply the alternating current flowing through the capacitor and the induction coil.

6. The instant recarburizer according to claim 4, wherein in step S4, the pig iron is placed in a pulverizer and added after being pulverized into particles of 200 mesh in diameter.

Technical Field

The invention relates to the field of smelting, in particular to an instant carburant easy to float downwards and a preparation method thereof.

Background

In the casting process, the molten iron needs to be recarburized so as to meet the requirements of iron materials with different specifications on fixed carbon content, and the recarburizing agent is mainly added. The existing commercial carburant comprises pig iron, an asphalt coke carburant, a graphite electrode carburant, a petroleum coke carburant, a coal carburant, an artificial graphite carburant and the like, but the respective carburant has performance defects, and the market acceptance needs to be improved. The pig iron has high price, high sulfur content and silicon content and low carbon absorption rate. The impurity contained in the carburant which is formed by calcining petroleum coke, pitch coke and the like through fossil fuel is difficult to remove, the structure is too compact, the absorption rate is low, and the production process can cause great pollution. The artificial graphite is the best carburant in quality at present, but the cost is very expensive, and the environment is also greatly polluted in the production process, and all the carburants at present have the defects that the melting absorption time is long, the floating burning loss is easy to occur, and the carburant cannot be added to the upper part of an electric furnace. Even if the melting time is added, it is time-consuming and power-consuming, and the absorption rate is extremely low.

Disclosure of Invention

In order to solve the problems, the pig iron added with the instant recarburizing agent is adopted, so that the pig iron has the advantages of increased specific gravity, difficult floating, easy melting in molten iron, low melting point of iron and melting and absorption time which is only one fifth of that of the common recarburizing agent. The aim of rapid recarburization is achieved. The problem of carbon supplement before discharge at present is solved.

Therefore, according to one aspect of the invention, an instant carburant easy to float downwards is provided, which comprises artificial crystal graphite, petroleum coke powder and pig iron, wherein the particle size is 60-65 μm, and the weight parts of the following components are included: 70-80g of artificial crystal graphite, 20-30g of petroleum coke powder and 4-8g of pig iron.

In some embodiments, the artificial crystalline graphite, petroleum coke powder and pig iron have a particle size of not more than 64 μm, including the following weight parts: 75g of artificial crystal graphite, 25g of petroleum coke powder and 6g of pig iron.

In some embodiments, the artificial crystalline graphite, petroleum coke powder and pig iron have a particle size of not more than 62 μm, and comprise the following parts by weight: 80g of artificial crystal graphite, 30g of petroleum coke powder and 8g of pig iron.

According to another aspect of the invention, a preparation method of the instant carburant easy to float downwards is provided, which comprises the following steps:

s1: weighing 70-80g of artificial crystal graphite and 20-30g of petroleum coke powder, pouring the artificial crystal graphite and the petroleum coke powder into an open container, wherein the speed of a stirrer in the container is 20-30r/min, the temperature is raised to 70-74 ℃, weighing 50-60g of electrode powder, and pouring 100-120g of charcoal powder into the open container, wherein the speed of the stirrer in the container is 10-20 r/min;

s2: opening the submerged arc furnace, pouring a mixture of artificial crystal graphite and petroleum coke powder from a furnace mouth of the submerged arc furnace, closing a furnace door, burning and heating fuel at the bottom of the furnace, raising the temperature of a catalyst bed layer in the submerged arc furnace to 1300-plus-one 1500 ℃, preserving the heat for 1-1.5h, naturally cooling the submerged arc furnace to room temperature, and sieving the cooled catalyst bed layer with a 210-plus-230-mesh sieve to obtain a graphite raw material;

s3: under the nitrogen atmosphere, heating the graphite raw material from room temperature to 1800 plus 2800 ℃ at the heating rate of 5.0-30.0 ℃/min, preserving the heat for 0.5-30.0h, then naturally cooling the inside of the furnace to the room temperature, and sieving the graphite raw material by a 200-mesh sieve to obtain the graphite material;

s4: the sintering temperature of the graphite material medium-temperature ore-smelting furnace is raised to 2000-;

s5: pouring the raw material prepared in the step S5 into a belt dryer, uniformly spreading the raw material on a 13-14-mesh steel wire mesh, and drying the granulated raw material by hot air through a built-in hot air system in the moving process of the steel wire mesh;

s6: pouring the carburant into a crusher, colliding with a crushing hammer in the crusher at high speed under the action of high-speed centrifugal force, crushing at high density, mutually striking, rubbing and crushing for multiple times, discharging from the lower part of the crusher, and screening the carburant by using a filter screen to obtain the carburant with the granularity of 2-5 mu m.

S7: and pouring the dried granulating raw material into a double-screw granulator, fully plasticizing and melting the granulating raw material in a machine barrel by utilizing the thread space between the double screws during heating, and extruding the granulating raw material by a forming wheel arranged on an extrusion port to obtain the formed carburant.

In some embodiments, the heater for heating by twin screw is a three-phase industrial frequency ac current, and supplies an alternating current flowing through a capacitor and an induction coil in step S7.

In some embodiments, the pig iron is placed in a pulverizer and added after grinding to 200 mesh diameter particles in step S4.

Compared with the prior art, the invention has the beneficial effects that: the preparation method of the easy-floating instant carburant provided by the invention adopts the pig iron added in the instant carburant, so that the proportion of the pig iron is increased, the pig iron is not easy to float, the pig iron is easy to melt in molten iron, the melting point of the iron is low, and the melting and absorption time is only one fifth of that of the common carburant. The aim of rapid carburetion is achieved, and the problem of carbon supplement before tapping is solved.

Drawings

Fig. 1 is a flow chart of an easy-to-float instant recarburizer and a preparation method thereof according to an embodiment of the invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.