Acidification roasting method for efficiently treating aluminum electrolysis solid waste

A solid waste, acidification roasting technology, applied in the direction of alumina/hydroxide preparation, hydrogen fluoride, fluorine/hydrogen fluoride, etc., can solve the problems such as the conversion rate of fluoride that is not mentioned, and achieve thorough and efficient roasting reaction, convenient operation, The effect of avoiding pollution

Active Publication Date: 2022-02-11
NORTHEASTERN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above-mentioned prior art aims at electrolytic aluminum waste slag, and prepares cryolite or lithium carbonate with electrolytic aluminum waste slag and concentrated sulfuric acid as raw materials, so that the resources in electrolytic aluminum waste slag can be recovered to a certain extent, but does not mention the fluoride in the process of acidification and roasting conversion rate of

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  • Acidification roasting method for efficiently treating aluminum electrolysis solid waste

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Effect test

Embodiment 1

[0025] An acidification and roasting method for efficiently treating aluminum electrolytic solid waste, the specific operation is as follows:

[0026] Take 20g of pure cryolite and prepare it in the form of particles less than 200 mesh; mix it with alumina at a mass ratio of 1:1; prepare sulfuric acid with a concentration of 98%: mix the mixed material with concentrated sulfuric acid at a mass ratio of 1 : 4 mixed into the crucible, placed in a roasting device, at a temperature of 250°C, with a stirring speed of 500r / min, roasted for 2h; during the roasting process, use aluminum hydroxide to absorb the hydrogen fluoride gas generated by the reaction; after the roasting reaction is completed and cooled , add 400ml of deionized water to the roasted product, stir and react at room temperature for 1h, filter to obtain the filtrate and filter residue; the filter residue is washed and dried; the obtained filtrate is a solution containing sodium sulfate and aluminum sulfate, and the f...

Embodiment 2

[0029] An acidification and roasting method for efficiently treating aluminum electrolytic solid waste, the specific operation is as follows:

[0030] Take 20g of waste solid aluminum electrolyte, crush, ball mill, and sieve to make it standby in the form of particles smaller than 200 mesh; mix it with alumina at a mass ratio of 2:1; prepare sulfuric acid with a concentration of 98%: mix the The uniform material and concentrated sulfuric acid are mixed into the crucible at a mass ratio of 1:1, placed in a roasting device, and roasted for 1 hour at a temperature of 150°C with a stirring speed of 500r / min; during the roasting process, aluminum hydroxide, adsorption reaction Generated hydrogen fluoride gas; after the roasting reaction is finished and cooled, add 400ml of deionized water to the roasted product, stir and react at room temperature for 1h, filter to obtain the filtrate and filter residue; wash and dry the filter residue; the obtained filtrate It is a sulfate solution...

Embodiment 3

[0032] An acidification and roasting method for efficiently treating aluminum electrolytic solid waste, the specific operation is as follows:

[0033] Take 20g of waste solid aluminum electrolyte, crush, ball mill, and sieve to make it ready for use in the form of particles smaller than 200 mesh; mix it with alumina at a mass ratio of 1:1; prepare sulfuric acid with a concentration of 98%: put the mixed The uniform material and concentrated sulfuric acid are mixed into the crucible at a mass ratio of 1:3, placed in a roasting device, and roasted for 2 hours at a temperature of 250°C with a stirring speed of 500r / min; during the roasting process, aluminum hydroxide, adsorption reaction Generated hydrogen fluoride gas; after the roasting reaction is finished and cooled, add 400ml of deionized water to the roasted product, stir and react at room temperature for 1h, filter to obtain the filtrate and filter residue; wash and dry the filter residue; the obtained filtrate It is a sul...

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Abstract

The invention discloses an acidification roasting method for efficiently treating aluminum electrolysis solid waste, and belongs to the technical field of resourceful treatment of the aluminum electrolysis solid waste. The method is characterized in that the specific treatment process comprises the following steps: uniformly mixing the aluminum electrolysis solid waste and aluminum oxide according to a ratio, acidizing and roasting, and finally carrying out wet-process water leaching treatment. According to the method, the aluminum electrolysis solid waste serves as a raw material and is mixed with a certain amount of aluminum oxide, sulfating roasting-water leaching treatment is carried out, finally, valuable elements are sufficiently and efficiently converted into the sulfate solution, and meanwhile the aluminum oxide solid is separated and recycled. According to the method, the aluminum electrolysis solid waste is directly utilized, aluminum oxide is added, so that the fluoride is acidified and roasted more sufficiently, finally, harmlessness is achieved, valuable elements, aluminum oxide, fluorine resources, lithium and potassium resources and the like in the aluminum electrolysis solid waste can be effectively recycled, waste is turned into wealth, the process is simple, and industrial implementation is easy.

Description

technical field [0001] The invention belongs to the technical field of recycling treatment of aluminum electrolysis solid waste, and in particular relates to an acidification and roasting method for efficiently treating aluminum electrolysis solid waste. Background technique [0002] In recent years, my country's electrolytic aluminum industry has developed rapidly. With the increase in the production of electrolytic aluminum, the solid waste produced in the electrolysis process, in addition to waste cathode carbon blocks, such as waste aluminum electrolyte, electrolytic cell furnace bottom precipitation, aluminum electrolysis anode covering materials and other solid waste slag containing fluoride, is also rapidly produced. rise. At present, the annual solid waste generated by my country's electrolytic aluminum industry is about 250,000 tons, and there are more than 2 million tons of accumulated solid waste. Under the current technical conditions, electrolytic aluminum pla...

Claims

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Application Information

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IPC IPC(8): C01F7/32C01B7/19C01D5/02C01D15/06
CPCC01F7/32C01B7/191C01D5/02C01D15/06
Inventor 陶文举吴少华王兆文葛辉郑晏辰杨酉坚石忠宁高炳亮胡宪伟
Owner NORTHEASTERN UNIV
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