阅读说明：本技术 一种二次铝灰的处理方法 (Method for treating secondary aluminum ash ) 是由 许桂领 于 2020-07-14 设计创作，主要内容包括：本发明公开了一种二次铝灰的处理方法,包括以下步骤：步骤一、按照工艺要求量取一份二次铝灰,3份98%的浓硫酸和5~6份的碳酸氢氨,并分别放置；步骤二、将处理后的铝灰倒入稀释后的硫酸中反应,制取硫酸铝溶液；步骤三、将硫酸铝溶液添加进碳酸氢氨溶液中反应铵；步骤四、待硫酸铝溶液添加完毕后持续搅拌15~20分钟后停止搅拌静置沉淀后过滤；步骤五、将步骤五中过过滤的固体沉淀表面残留的溶液清洗之后通过干燥设备干燥去除多余水分得到碳酸铝胺颗粒；步骤六、将上述干燥后的碳酸铝胺颗粒送入高温窑炉中煅烧1~1.5h得到纳米级氧化铝粉体。通过上述方式,本发明能够提高产品中二次铝灰中的铝元素的回收利用率,而且最终产品为晶型规整的α型氧化铝。(The invention discloses a method for treating secondary aluminum ash, which comprises the following steps: step one, measuring one part of secondary aluminum ash, 3 parts of 98% concentrated sulfuric acid and 5-6 parts of ammonium bicarbonate according to process requirements, and respectively placing; step two, pouring the treated aluminum ash into diluted sulfuric acid for reaction to prepare aluminum sulfate solution; step three, adding an aluminum sulfate solution into an ammonia bicarbonate solution to react ammonium; step four, after the aluminum sulfate solution is added, continuously stirring for 15-20 minutes, stopping stirring, standing, precipitating and filtering; step five, cleaning the solution on the surface of the solid precipitate filtered in the step five, and drying the solution by drying equipment to remove excessive water to obtain aluminum carbonate amine particles; and sixthly, feeding the dried ammonium aluminum carbonate particles into a high-temperature kiln to calcine for 1-1.5 h to obtain the nano-alumina powder. Through the mode, the recovery rate of the aluminum element in the secondary aluminum ash in the product can be improved, and the final product is the alpha-type alumina with regular crystal form.)

1. The method for treating the secondary aluminum ash is characterized by comprising the following steps of:

step one, measuring one part of secondary aluminum ash, 3 parts of 98% concentrated sulfuric acid and 5-6 parts of ammonium bicarbonate according to process requirements, and respectively placing;

step two, diluting 98% concentrated sulfuric acid with water by 8-12 times according to a constant volume mode to obtain a sulfuric acid solution; then, putting the obtained sulfuric acid solution into a first reaction kettle, continuously stirring, slowly pouring pre-crushed secondary aluminum ash into the first reaction kettle for reaction in the stirring process, and filtering and removing slag to obtain an aluminum sulfate solution after the reaction is finished;

step three, putting the ammonium bicarbonate measured in the step one into a second reaction kettle, then adding water with the mass 2-4 times of the total mass of the ammonium bicarbonate into the reaction kettle brown, uniformly stirring to prepare an ammonium bicarbonate solution, then slowly adding the aluminum sulfate solution obtained in the step two into the ammonium bicarbonate solution which is continuously stirred to react, and adjusting the pH value of the solution at any time in the reaction process to keep the reaction environment weakly alkaline;

step four, after the aluminum sulfate solution is added, continuously stirring for 15-20 minutes, stopping stirring, standing, precipitating and filtering;

step five, cleaning the solution on the surface of the solid precipitate filtered in the step five, and drying the solution by drying equipment to remove excessive water to obtain aluminum carbonate amine particles;

and sixthly, feeding the dried ammonium aluminum carbonate particles into a high-temperature kiln to calcine for 1-1.5 h to obtain the nano-alumina powder.

2. The method for treating secondary aluminum ash according to claim 1, wherein the reaction temperature of the first reaction kettle in the reaction in the second step is 80-100 ℃, and the reaction time is 1-1.5 h.

3. The method for treating secondary aluminum ash as recited in claim 1, wherein the pH of the solution is adjusted by ammonia water in the third step.

4. The method for treating secondary aluminum ash as claimed in claim 1, wherein the reaction environment in the third step is pH 9-10.

5. The method for treating secondary aluminum ash according to claim 1, wherein the standing time in the fourth step is 24-48 h.

6. The method for treating secondary aluminum ash as claimed in claim 1, wherein the cleaning in the fifth step is carried out in two steps, the first step is water washing to remove chemical substance residues on the surface of the precipitate by flowing water, the second step is alcohol washing to remove surface moisture and chemical substance residues by mixed washing with alcohol, and then the alcohol is filtered to obtain the aluminum carbonate amine particles.

7. The method for treating secondary aluminum ash as recited in claim 1, wherein the drying equipment used in the fifth step is microwave drying equipment.

8. The method for treating secondary aluminum ash as recited in claim 1, wherein the calcination temperature is 1150 ℃ to 1200 ℃.

Technical Field

The invention relates to the field of resource recovery, in particular to a method for treating secondary aluminum ash.

Background

The secondary aluminum ash is ash which is generated in the regeneration process of waste aluminum and cannot be directly utilized, is rich in aluminum oxide and various other impurities, is difficult to directly recycle through a metallurgical method, can only be directly used as a raw material of refractory bricks and other materials, and inevitably wastes a large amount of aluminum resources. In order to fully utilize the aluminum in the secondary aluminum ash, an acid leaching method is developed in practice, the aluminum element in the ash is leached in a salt form, but the generation amount of ammonia gas is large when the secondary aluminum ash is treated by the common acid leaching method, and the purity of the aluminum oxide serving as a final product is not high.

Disclosure of Invention

The invention mainly solves the technical problem of providing a method for treating secondary aluminum ash, which can improve the utilization rate of aluminum elements in the aluminum ash.

In order to solve the technical problems, the invention adopts a technical scheme that: the method for treating the secondary aluminum ash comprises the following steps:

step one, measuring one part of secondary aluminum ash, 3 parts of 98% concentrated sulfuric acid and 5-6 parts of ammonium bicarbonate according to process requirements, and respectively placing;

step two, diluting 98% concentrated sulfuric acid with water by 8-12 times according to a constant volume mode to obtain a sulfuric acid solution; then, putting the obtained sulfuric acid solution into a first reaction kettle, continuously stirring, slowly pouring pre-crushed secondary aluminum ash into the first reaction kettle for reaction in the stirring process, and filtering and removing slag to obtain an aluminum sulfate solution after the reaction is finished;

step three, putting the ammonium bicarbonate measured in the step one into a second reaction kettle, then adding water with the mass 2-4 times of the total mass of the ammonium bicarbonate into the reaction kettle brown, uniformly stirring to prepare an ammonium bicarbonate solution, then slowly adding the aluminum sulfate solution obtained in the step two into the ammonium bicarbonate solution which is continuously stirred to react, and adjusting the pH value of the solution at any time in the reaction process to keep the reaction environment weakly alkaline;

step four, after the aluminum sulfate solution is added, continuously stirring for 15-20 minutes, stopping stirring, standing, precipitating and filtering;

step five, cleaning the solution on the surface of the solid precipitate filtered in the step five, and drying the solution by drying equipment to remove excessive water to obtain aluminum carbonate amine particles;

and sixthly, feeding the dried ammonium aluminum carbonate particles into a high-temperature kiln to calcine for 1-1.5 h to obtain the nano-alumina powder.

In a preferred embodiment of the present invention, the reaction temperature of the first reaction vessel during the reaction in the second step is 80 ℃ to 100 ℃, and the reaction time is 1 to 1.5 hours.

In a preferred embodiment of the present invention, ammonia is used in the third step to adjust the pH of the solution.

In a preferred embodiment of the present invention, the reaction environment in the third step is pH 9-10.

In a preferred embodiment of the present invention, the standing time in the fourth step is 24 to 48 hours.

In a preferred embodiment of the present invention, the cleaning in the fifth step is divided into two steps, the first step is water washing to remove the chemical substance residue on the surface of the precipitate by flowing water, the second step is alcohol washing to remove the surface moisture and the chemical substance residue by mixed washing with alcohol, and then the alcohol is filtered to obtain the aluminum carbonate amine particles.

In a preferred embodiment of the present invention, the drying device used in the fifth step is a microwave drying device.

In a preferred embodiment of the present invention, the calcination temperature is 1150 ℃ to 1200 ℃.

The invention has the beneficial effects that: according to the invention, the existing acid leaching method is improved, the aluminum carbonate amine is used as an intermediate, and the secondary aluminum ash is used for producing the aluminum oxide, compared with the common secondary aluminum ash treatment process, the utilization rate of aluminum elements in the aluminum ash is high and can reach more than 90%, and the prepared high-purity alpha-phase aluminum oxide with regular aluminum oxide crystal form can reduce the ammonia amount generated by aluminum nitride.

Detailed Description

The following detailed description of the preferred embodiments of the present invention is provided to enable those skilled in the art to more readily understand the advantages and features of the present invention, and to clearly and unequivocally define the scope of the present invention.

The embodiment of the invention comprises the following steps: