阅读说明：本技术 一种利用铝灰制备棕刚玉生产原料的方法 (Method for preparing brown corundum production raw material by using aluminum ash ) 是由 佟玉鹏 于 2020-05-20 设计创作，主要内容包括：本发明涉及工业固体废弃物资源化利用领域,尤其涉及一种利用铝灰制备棕刚玉生产原料的方法：将待处理的铝灰破碎成50目全部过筛的铝灰粉末；将粒度符合50目全部过筛的铝灰粉末装入加热设备内；铝灰粉末装入加热设备后,首先将容器内的铝灰加热到≥550℃,并维持时间大于等于10分钟；设备内送入氧气进行加热和吹氧处理,使容器中的铝灰保持在大于等于700℃,经过0.2～2h加热和吹氧处理之后,铝灰即成为替代铝矾土制备棕刚玉的原料。本方法处理过的铝灰,杂质少并且氧化铝含量高,可以替代铝矾土生产棕刚玉,实现工业固体废弃物—铝灰的资源化利用,变废为宝。(The invention relates to the field of resource utilization of industrial solid wastes, in particular to a method for preparing a brown corundum production raw material by using aluminum ash, which comprises the following steps: crushing the aluminum ash to be treated into 50-mesh aluminum ash powder which is completely sieved; putting the aluminum ash powder which is completely sieved and has the granularity of 50 meshes into heating equipment; after the aluminum ash powder is loaded into heating equipment, firstly heating the aluminum ash in a container to more than or equal to 550 ℃, and maintaining for more than or equal to 10 minutes; and feeding oxygen into the equipment for heating and oxygen blowing treatment, keeping the aluminum ash in the container at the temperature of more than or equal to 700 ℃, and after heating and oxygen blowing treatment for 0.2-2 h, obtaining the aluminum ash as a raw material for replacing bauxite to prepare brown alumina. The aluminum ash treated by the method has less impurities and high aluminum oxide content, can replace bauxite to produce brown corundum, realizes resource utilization of industrial solid waste aluminum ash, and changes waste into valuable.)

1. A method for preparing brown corundum production raw materials by using aluminum ash is characterized by comprising the following steps: the method comprises the following steps:

step one, crushing the aluminum ash to be treated into 50-mesh aluminum ash powder which is completely sieved;

step two, filling all sieved aluminum ash powder with the granularity of 50 meshes into heating equipment;

step three, after the aluminum ash powder is loaded into heating equipment, firstly heating the aluminum ash in the container to be more than or equal to 550 ℃, and maintaining for more than or equal to 10 minutes;

and step four, feeding oxygen into the equipment for heating and oxygen blowing treatment, keeping the aluminum ash in the container at the temperature of more than or equal to 700 ℃, and after heating and oxygen blowing treatment for 0.2-2 h, obtaining the aluminum ash as a raw material for replacing bauxite to prepare brown corundum.

2. The method for preparing brown corundum production raw material by using aluminum ash according to claim 1, is characterized in that: in the third step and the fourth step, the pressure in the heating equipment is kept between-100 Pa and +100 Pa.

3. The method for preparing brown corundum production raw material by using aluminum ash according to claim 1, is characterized in that: the heating equipment adopts internal heating type indirect heating, and the heat source of the indirect heating is coal gas or electric heat or corundum furnace tail gas.

4. The method for preparing brown corundum production raw material by using aluminum ash according to claim 3, is characterized in that: the heat source for indirect heating is corundum furnace tail gas.

5. The method for preparing brown corundum production raw material by using aluminum ash according to claim 1, is characterized in that: the heating equipment is powder drying equipment.

6. The method for preparing brown corundum production raw material by using aluminum ash according to claim 1, is characterized in that: the heating and oxygen blowing treatment process of the fourth step is intermittent, namely the charging and discharging are intermittent, the charging is carried out for one time, the discharging is carried out after the whole heating and oxygen blowing treatment process is finished, the treatment of one batch is finished, then the next batch is charged, and the treatment of the next batch is started.

7. The method for preparing brown corundum production raw material by using aluminum ash according to claim 1, is characterized in that: the heating and oxygen blowing treatment process in the fourth step is continuous, namely the charging, the heating and oxygen blowing and the discharging are continuously carried out, the charging is continuously carried out at the charging hole, and the discharging is continuously carried out at the discharging hole.

8. A heating apparatus for use in the method of claim 1, wherein: the whole horizontal shell (7) of heating equipment can the structure of gyration, shell (7) are equipped with inside feed inlet (1) of intercommunication, discharge gate (2), air inlet (3), gas outlet (4), heat medium entry (5) and heat medium export (6), feed inlet (1) is located the upside of the one end of shell (7), discharge gate (2) are located the downside of the other end of shell (7), air inlet (3) are located the downside of shell (7) middle part, gas outlet (4) are located the upside of the one end the same with discharge gate (2) of shell (7), heat medium entry (5) and heat medium export (6) are located the both sides of shell (7).

9. The heating apparatus according to claim 8, wherein: the inner shell (8) is arranged in the outer shell (7), and the inner shell (8) is a heat medium pipe (9) or the heat medium pipe (9) is coiled between the outer shell (7) and the inner shell (8).

10. The heating apparatus according to claim 8 or 9, characterized in that: the downside of shell (7) is equipped with one base (11), shell (7) are equipped with support cover (14) outward, one side support cover (14) of shell (7) are equipped with wide narrow supporting leg (10) down, the bottom of supporting leg (10) is the arc contact surface, the bottom support of supporting leg (10) is on base (11), base (11) are equipped with one spacing recess (13) with supporting leg (10) cooperation department, the opposite side of shell (7) is for keeping away from one side of discharge gate (2), be connected with slewing drive machine (12), the bottom of slewing drive machine (12) is connected on base (11).

Technical Field

The invention relates to the field of resource utilization of industrial solid wastes, in particular to a method for preparing a brown corundum production raw material by using aluminum ash and equipment for treating the aluminum ash by using the method.

Background

The aluminum ash is slag generated in the production processes of electrolytic aluminum, metal aluminum alloy casting, metal aluminum recovery and the like, and is solid waste in industrial production. The aluminum ash mainly contains Al₂O₃、SiO₂、CaO、Fe₂O₃MgO and elemental Al and some nitrides and chlorides. At present, except for extracting metal aluminum by a refining or mechanical method, most of the residual aluminum ash is treated by a landfill method, which is easy to cause environmental pollution. Albeit withA small amount of aluminum ash is used in the fields of producing aluminum sulfate, synthesizing polyaluminium chloride, synthesizing alumina for printing ink, basic aluminum chloride (water purifying agent) and the like, but the occasions of the application of the aluminum ash also have the problem of secondary pollution.

The brown fused alumina is made up by using bauxite and coke (anthracite) as main raw material and adopting high-temp. smelting process in electric arc furnace, and is a high-grade abrasive material and high-grade refractory material. The market demand of the brown corundum is great, and the resource of high-quality bauxite which is a raw material for producing the brown corundum is less and less. The main component of the aluminum ash is alumina, and in addition to the above applications, the aluminum ash can be used for preparing brown alumina instead of bauxite after being treated. Such as a method (200610148219.1) for producing brown fused alumina by using aluminum ash, a treatment process (201310205937.8) for producing the aluminum ash for the brown fused alumina, an aluminum ash treatment system (201510123613.9) for producing the corundum, a method (201310205936.3) for producing the brown fused alumina by using aluminum ash through low-temperature smelting, a method (201611069568.4) for preparing raw materials for producing the brown fused alumina by using the aluminum ash and the like. However, the known methods for producing brown corundum by using aluminum ash to replace bauxite still have the problems of complex production process, high energy consumption, secondary pollution or low physical and chemical indexes of brown corundum products and the like.

Therefore, it is necessary to develop a recycling technology for aluminum ash with simple process, low energy consumption and no secondary pollution, and improve the physical and chemical indexes of the product, thereby improving the recycling value of the aluminum ash, which is an industrial solid waste.

Disclosure of Invention

Object of the Invention

In order to solve the problems of high impurity content and low alumina content when the aluminum ash is used as a raw material for producing brown fused alumina instead of bauxite in the prior art, the invention provides a method for preparing the raw material for producing the brown fused alumina by using the aluminum ash. The aluminum ash treated by the method has less impurities and high aluminum oxide content, can replace bauxite to produce brown corundum, realizes resource utilization of industrial solid waste aluminum ash, and reduces adverse effects on the environment.

Technical scheme

A method for preparing brown corundum production raw materials by using aluminum ash comprises the following steps:

step one, crushing the aluminum ash to be treated into 50-mesh aluminum ash powder which is completely sieved;

step two, filling all sieved aluminum ash powder with the granularity of 50 meshes into heating equipment;

step three, after the aluminum ash powder is loaded into heating equipment, firstly heating the aluminum ash in the container to be more than or equal to 550 ℃, and maintaining for more than or equal to 10 minutes;

and step four, feeding oxygen into the equipment for heating and oxygen blowing treatment, keeping the aluminum ash in the container at the temperature of more than or equal to 700 ℃, and after heating and oxygen blowing treatment for 0.2-2 h, obtaining the aluminum ash as a raw material for replacing bauxite to prepare brown corundum.

In the third step and the fourth step, the pressure in the heating equipment is kept between-100 Pa and +100 Pa.

The heating equipment adopts internal heating type indirect heating, and the heat source of the indirect heating is coal gas or electric heat or corundum furnace tail gas. The heat source for indirect heating is preferably corundum furnace tail gas.

The heating equipment is powder drying equipment.

The heating and oxygen blowing treatment process of the fourth step is intermittent, namely the charging and discharging are intermittent, the charging is carried out for one time, the discharging is carried out after the whole heating and oxygen blowing treatment process is finished, the treatment of one batch is finished, then the next batch is charged, and the treatment of the next batch is started.

The heating and oxygen blowing treatment process in the fourth step can also be continuous, namely the charging, the heating and oxygen blowing and the discharging are continuously carried out, the charging is continuously carried out at the charging hole, and the discharging is continuously carried out at the discharging hole.

The heating equipment used in the method is of a horizontal shell rotatable structure, the shell is provided with a feed inlet, a discharge outlet, an air inlet, an air outlet, a heat medium inlet and a heat medium outlet which are communicated with the interior of the shell, the feed inlet is positioned at one end of the shell, the discharge outlet is positioned at the lower side of the other end of the shell, the air inlet is positioned in the middle section of the shell, the air outlet is positioned at the upper side of the same end of the shell as the discharge outlet, and the heat medium inlet and the heat medium outlet are positioned at two ends of the shell.

The inner shell is arranged in the outer shell, namely the heat medium pipe or the heat medium pipe is coiled between the outer shell and the inner shell.

The downside of shell is equipped with a base, and the shell is equipped with the support cover outward, and one side support cover of shell is equipped with wide supporting leg down, and the bottom of supporting leg is the arc contact surface, and the bottom of supporting leg supports on the base, and the base is equipped with a spacing recess with supporting leg cooperation department, and the opposite side of shell is for keeping away from one side of discharge gate, is connected with the gyration driving machine, and the bottom of gyration driving machine is connected on the base.

Advantages and effects

The aluminum ash treated by the method has less impurities and high content of aluminum oxide, and can replace bauxite to produce brown corundum. In the treatment process, no solution is used, and no secondary pollution is caused. Compared with other aluminum ash treatment methods, the method has the advantages of energy saving and low cost. The method is beneficial to resource utilization of industrial solid wastes, solves the problem of gradual shortage of high bauxite resources, and greatly reduces the cost of raw materials; the method is favorable for improving the content of alumina in the brown corundum finished product prepared from the aluminum ash and improving the physical and chemical indexes of the brown corundum product prepared from the aluminum ash.

Drawings

FIG. 1 is a flow chart of a method for preparing a raw material for producing brown fused alumina from aluminum ash;

FIG. 2 is a perspective view of an apparatus used in the method for preparing a raw material for producing brown fused alumina from aluminum ash;

FIG. 3 is a schematic plan view of the apparatus of FIG. 2 with the support structure attached to the lower end thereof;

FIG. 4 is a schematic view showing the construction of the apparatus in a state in which the heat medium pipe is coiled;

FIG. 5 is a schematic view showing the structure of the apparatus in the case where the heat medium pipe is an inner shell.

The reference numbers illustrate: 1. the device comprises a feed inlet, a discharge outlet, a gas inlet, a gas outlet, a heat medium inlet, a heat medium outlet, a heat medium outer shell, a heat medium inner shell, a heat medium pipe, support legs, a base, a rotary driving machine, a limiting groove and a support sleeve, wherein the feed inlet is 2, the discharge outlet is 3, the gas inlet is 4, the gas outlet is 5.

Detailed Description

The technical solutions of the present invention will be described in further detail with reference to the accompanying drawings and specific implementations, and all the portions of the present invention that are not described in detail are the prior art.

As shown in figure 1, a method for preparing brown fused alumina production raw materials by using aluminum ash comprises the following steps:

step one, crushing the aluminum ash to be treated into 50-mesh aluminum ash powder which is completely sieved;

step two, putting all sieved aluminum ash powder with the granularity of 50 meshes into heating equipment through a closed pipeline;

step three, after the aluminum ash powder is loaded into heating equipment, firstly heating the aluminum ash in the container to be more than or equal to 550 ℃, and maintaining for more than or equal to 10 minutes;

and step four, feeding oxygen into the equipment for heating and oxygen blowing treatment, and controlling the heating amount and the oxygen blowing amount to keep the aluminum ash in the container at a temperature of more than or equal to 700 ℃, wherein the aluminum ash is used as a raw material for replacing bauxite to prepare brown alumina after heating and oxygen blowing treatment for 0.2-2 hours.

In the third step and the fourth step, the pressure in the heating equipment is kept between-100 Pa and +100 Pa.

In order to prevent the heat source for heating from polluting the aluminum ash being treated, the heating equipment adopts internal heating type indirect heating, the heat source for indirect heating is coal gas or electric heat or corundum furnace tail gas, and preferably, the heat source for indirect heating is corundum furnace tail gas. The heating device may use a powder drying device of the related art. Such as fluidized bed dryers, rotary dryers, flash dryers, ebullating dryers, and the like, or variations of these types of dryers.

The heating and oxygen blowing treatment process in the fourth step is intermittent or continuous. Intermittent means that the charging and discharging are intermittent, the charging is carried out once, the discharging is carried out after the whole heating and oxygen blowing treatment process is finished, the treatment of one batch is finished, then the next batch is charged, and the treatment of the next batch is started. Continuous means that charging, heating and oxygen blowing and discharging are continuously carried out without pause in the middle.

A heating device used in a method for preparing a brown corundum production raw material by using aluminum ash, the whole heating device is of a horizontal shell 7 rotatable structure, the shell 7 is provided with a feed inlet 1, a discharge outlet 2, an air inlet 3, an air outlet 4, a heat medium inlet 5 and a heat medium outlet 6 which are communicated with the interior of the shell, the feed inlet 1 is positioned at one end of the shell 7, the discharge outlet 2 is positioned at the lower side of the other end of the shell 7, the air inlet 3 is positioned at the middle part of the shell 7, the air outlet 4 is positioned at the upper side of the same end of the shell 7 as the discharge outlet 2, the feed inlet 1 is used for feeding materials, the discharge outlet 2 is used for discharging materials, the air inlet 3 is used for feeding gas, when the device is used in the method, oxygen or air; the heating medium inlet 5 and the heating medium outlet 6 are positioned at two ends of the shell 7, and the heating medium pipe 9 is a pipeline arranged in the heating equipment or the shell 7 is the heating medium pipe 9. The heat medium inlet 5 and the heat medium outlet 6 are respectively used for introducing and discharging heat media, when the heating equipment is used, the gas outlet 4 is connected with the induced draft fan, and the pressure in the heating equipment can be controlled through the induced draft quantity of the induced draft fan. The shell 7 is provided with a structure for opening the end cover so as to be convenient for cleaning the inside, and is designed conventionally in the technical field.

Preferably, an inner shell 8 is arranged inside the outer shell 7, the inner shell 8 is a heat medium pipe 9 or the heat medium pipe 9 is coiled between the outer shell 7 and the inner shell 8, and the feed inlet 1, the discharge outlet 2, the air inlet 3 and the air outlet 4 are all communicated into the inner shell 8. The structure can prevent the heat medium from polluting the treated material, and the quality of the material is easier to guarantee.

Further preferably, the downside of shell 7 is equipped with a base 11, be equipped with support cover 14 outside shell 7, one side support cover 14 of shell 7 is equipped with wide supporting leg 10 narrow down, the bottom of supporting leg 10 is the arc contact surface, the bottom of supporting leg 10 supports on base 11, base 11 is equipped with a spacing recess 13 with supporting leg 10 cooperation department, such structure makes this heating equipment position more stable when using, the opposite side of shell 7 is the one side of keeping away from discharge gate 2, the bottom that is connected with rotary driving machine 12 is connected on base 11, rotary driving machine 12 is the prior art driving machine, the driving machine that can be used for prior art rotary kiln, the shell is driven down at rotary driving machine 12 together with the inner shell, can rotate around the shell axis under the support of support. The material reacts under the rotating condition, and the reaction efficiency is high. Preferably, the end of the housing having the inlet is higher than the end of the outlet 2, so that the material can be discharged from the apparatus more easily.

It should be understood that the detailed description of the present invention is only for illustrating the present invention and is not limited by the technical solutions described in the embodiments of the present invention, and all embodiments cannot be exhaustive, and those skilled in the art should understand that the present invention can be modified or substituted equally to achieve the same technical effects; as long as the use requirements are met, the method is within the protection scope of the invention.