Method for inhibiting reaction loss of metallic aluminum in process of extracting aluminum by using aluminum ash wet method

A technology of metal aluminum and aluminum ash, which is applied in the field of aluminum ash recycling, can solve the problems of metal aluminum loss and solution pH increase, and achieve the effects of reducing safety hazards and inhibiting chemical reactions

Active Publication Date: 2021-05-18
洛阳天瑞环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Then, because aluminum nitride in aluminum ash is very easy to undergo hydrolysis reaction in aqueous solution, ammonia gas is released. After ammonia gas dissolves in water, the pH value of the solution increases, thereby triggering a chemical reaction of metal aluminum and loss

Method used

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  • Method for inhibiting reaction loss of metallic aluminum in process of extracting aluminum by using aluminum ash wet method
  • Method for inhibiting reaction loss of metallic aluminum in process of extracting aluminum by using aluminum ash wet method
  • Method for inhibiting reaction loss of metallic aluminum in process of extracting aluminum by using aluminum ash wet method

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Primary aluminum ash in a place in Henan was selected as raw material (see Table 1 for specific composition), mixed and beaten according to the mass ratio of aluminum ash and water at a ratio of 1:1, and then the mixed slurry was spirally transported to a ball mill for wet grinding and crushing. The pH of the slurry was measured regularly at the outlet of the ball mill. When the slurry pH > 8.5, slowly add aluminum chloride solid into the ball mill inlet or beating tank, and stop adding aluminum chloride when the slurry pH shows a downward trend. figure 2 As shown; the discharge from the end of the ball mill is conveyed to the feed port of the vibrating sieve by a screw, and the screen is sprayed and washed with water on the upper part of the screen during the screening process, and the above-sieve aluminum powder rich in metal aluminum components and the under-sieve low metal aluminum components are obtained respectively. Slurry, the metal aluminum powder on the sieve...

Embodiment 2

[0041] Primary aluminum ash in a certain place in Henan was selected as the raw material (see Table 1 for the specific composition), mixed and beaten according to the ratio of aluminum ash to water mass ratio of 1:2, and then the mixed slurry was spirally transported to a ball mill for wet grinding and crushing. The pH of the slurry was measured regularly at the outlet of the ball mill. When the slurry pH>8.5, slowly add 5% dilute hydrochloric acid into the ball mill inlet or beating tank, stop adding dilute hydrochloric acid when the slurry pH shows a downward trend, and regularly detect the pH of the ball mill discharge, and ball mill before and after adding additives The change trend of slurry pH value is as follows: image 3As shown, the pH value of the slurry is kept close to neutral; the discharge from the end of the ball mill is conveyed to the feed port of the vibrating screen by a screw, and the screen is sprayed and washed with water on the upper part of the screen d...

Embodiment 3

[0048] The aluminum ash produced by an aluminum processing factory in Gongyi was selected as the raw material, and its metal aluminum content was determined to reach 49.21%. Since it contained many large pieces of aluminum, it was picked out by hand in advance. The remaining aluminum ash and water are mixed and beaten according to the mass ratio of 1:0.8, and then the mixed slurry is poured into a ball mill for ball milling and crushed, and the pH of the slurry is regularly measured at the outlet of the ball mill; when the pH of the slurry is > 8.5 , slowly add 10% dilute acetic acid into the feed port of the ball mill or the beating tank, and stop adding dilute acetic acid when the pH of the slurry shows a downward trend. Spray water on the upper part of the sieve for washing to obtain the over-sieve aluminum powder rich in metallic aluminum components and the under-sieve paddle with low metallic aluminum components. The over-sieved aluminum powder is dehydrated and then sent ...

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Abstract

The invention discloses a method for inhibiting the reaction loss of metallic aluminum in the process of extracting aluminum by using an aluminum ash wet method. The method for inhibiting the reaction loss of the metallic aluminum in the process of extracting the aluminum by using the aluminum ash wet method mainly comprises the following steps that mixing and pulping are carried out on aluminum ash and water according to a certain proportion, then the slurry is conveyed into a ball mill for crushing, and a certain amount of additive is added in the crushing process to adjust the property of the slurry, oversize aluminum powder rich in metal aluminum components and undersize slurry low in metal aluminum components are separated from the slurry subjected to ball milling by adopting a screening manner, and after oversize aluminum powder is washed and dried, a metal aluminum powder product is obtained. According to the method for inhibiting the reaction loss of the metallic aluminum in the process of extracting the aluminum by using the aluminum ash wet method, through chemical property adjustment of the slurry in the aluminum ash wet grinding and separation process, the increase of the pH value of the slurry caused by the hydrolysis reaction of aluminum nitride is controlled, the reaction loss of metal aluminum is greatly reduced, and the economical efficiency of wet-process aluminum extraction is improved; and in addition, the process that the metal aluminum participates in the reaction is inhibited, so that the amount of hydrogen generated in the grinding and separation process is greatly reduced, and the operation safety is further greatly improved.

Description

technical field [0001] The invention relates to the technical field of aluminum ash recovery and utilization, in particular to a method for suppressing the reaction loss of metal aluminum in the process of using aluminum ash to extract aluminum by wet method. Background technique [0002] Aluminum ash is produced in all processes of molten aluminum, mainly including: primary aluminum production (electrolytic aluminum), aluminum alloy production, waste aluminum recycling and aluminum ash treatment process. Generally, aluminum ash can be divided into primary aluminum ash and secondary aluminum ash according to the content of metal aluminum in aluminum ash. The aluminum slag picked out from the smelting furnace is called primary aluminum ash, which is off-white in appearance and is mainly a mixture of metal aluminum and aluminum oxide. The aluminum content can reach 15%-70%, and its recycling value is relatively large; Secondary aluminum ash is the waste after extracting metal...

Claims

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Application Information

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IPC IPC(8): C22B7/02C22B21/00C01F7/02
CPCC22B7/02C22B7/006C22B21/0023C01F7/02Y02P10/20
Inventor 刘宇锋田登超姬国强邱江涛
Owner 洛阳天瑞环保科技有限公司
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