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Deep hydrolysis method of aluminum nitride in aluminum ash

A technology of aluminum nitride and aluminum ash, which is applied in the direction of chemical instruments and methods, ammonium chloride, ammonium halide, etc., can solve the problems of long cycle, incomplete hydrolysis, and slow hydrolysis speed of aluminum nitride, so as to improve the hydrolysis efficiency, Realize the effect of resource utilization

Active Publication Date: 2018-06-29
INST OF PROCESS ENG CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the above-mentioned deficiencies in the prior art, the main purpose of the present invention is to overcome the problems of slow hydrolysis rate, long cycle and incomplete hydrolysis of aluminum nitride in aluminum ash in the natural state, and provide a kind of hydrolysis of aluminum nitride in aluminum ash. The deep hydrolysis method provides an effective way for the harmless disposal of aluminum nitride in aluminum ash

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] First crush 1kg of aluminum ash with an impact crusher to less than 10mm, then heat the aluminum ash to 200°C, leaching the aluminum ash and water in a wet sealed grinding at a ratio of 3:1, the ammonia gas generated during the grinding process Absorb with water to obtain ammonia water, grind ore for 30 minutes, perform plate-and-frame filter press to obtain filter cake and filtrate, analyze the content of aluminum nitride in the filter cake, it is found that aluminum nitride hydrolyzed aluminum is 99.21%, and the filtrate is evaporated to obtain industrial Salt.

Embodiment 2

[0027] First crush 1kg of aluminum ash to less than 10mm with an impact crusher, then heat the aluminum ash to 300°C, leaching the aluminum ash and water according to the ratio of 1:3 by wet sealed grinding, and the ammonia gas generated during the grinding process Ammonium chloride was obtained by absorption with hydrochloric acid. After grinding for 90 minutes, plate and frame pressure filtration was carried out to obtain filter cake and filtrate. The content of aluminum nitride in the filter cake was analyzed. It was found that the hydrolyzed aluminum of aluminum nitride was 99.31%, and the filtrate evaporated Then get industrial salt.

Embodiment 3

[0029] First crush 1kg of aluminum ash to less than 10mm with an impact crusher, then heat the aluminum ash to 100°C, leaching the aluminum ash and hot water in a wet sealed grinding at a ratio of 2:1, the ammonia generated during the grinding process Ammonium sulfate was obtained by absorbing the gas with sulfuric acid. After grinding for 60 minutes, the plate and frame filter was carried out to obtain the filter cake and filtrate. The content of aluminum nitride in the filter cake was analyzed. It was found that the hydrolyzed aluminum of aluminum nitride was 99.51%, and the filtrate evaporated Then get industrial salt.

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Abstract

The invention discloses a deep hydrolysis method of aluminum nitride in aluminum ash. The deep hydrolysis method comprises the following steps of 1) crushing the aluminum ash to form aluminum ash withthe particle size being 10mm or below, then heating the aluminum ash to a certain temperature, and uniformly mixing the heated aluminum ash and water according to a certain ratio; 2) performing grinding and hydrolyzing on obtained high-temperature slurry, and collecting ammonia gas produced by hydrolyzing at the same time to obtain corresponding ammonia water or ammonium salt; and 3) performing dewatering and filtering on the slurry after hydrolyzing to obtain a filter cake and a filtrate, and performing evaporation to recover industrial salt after circulating enrichment of the filtrate. According to the deep hydrolysis method provided by the invention, through the hydrolysis process of high temperature grinding and strengthening the aluminum nitride, deep hydrolysis of the aluminum nitride is realized, ammonia recovery is realized at the same time, so that a new way of harmless and resource utilization of the aluminum nitride in the aluminum ash is opened up.

Description

technical field [0001] The invention belongs to the technical field of electrolytic aluminum solid waste treatment, in particular, the invention relates to a deep hydrolysis method of aluminum nitride in aluminum ash. Background technique [0002] Aluminum ash is the scum floating on the surface of the aluminum melt during electrolytic aluminum and aluminum smelting. It is in the form of loose ash. Because it contains a large amount of aluminum nitride and fluoride, it poses a great threat to the surrounding environment and is listed as dangerous by the country. waste. my country is a big producer of electrolytic aluminum, accounting for more than half of the world's electrolytic aluminum production, and produces more than 1.5 million tons of waste aluminum ash every year. Therefore, the harmless disposal method of waste aluminum ash has become one of the problems to be solved urgently in my country's environmental protection work. [0003] At present, according to the dif...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01C1/02C01C1/16C01C1/242B09B3/00
CPCB09B3/00C01C1/022C01C1/026C01C1/164C01C1/242
Inventor 郭强李永利刘宇峰齐涛
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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