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A method for comprehensive utilization of aluminum ash

A technology of aluminum ash and aluminum hydroxide, which is applied in the field of green recycling of solid waste, can solve the problems of long nitrogen removal time, no good process method, poor effect, etc., and achieve the effect of recycling

Active Publication Date: 2020-05-22
SHENYANG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among the various methods of processing aluminum ash, the key to avoiding secondary environmental pollution is to deal with the problem of aluminum nitride. The existing public information shows that the treatment of aluminum nitride is generally carried out by adding aluminum ash to hot water. Denitrification by hydrolysis, but the nitrogen removal time is long and the effect is not good
In particular, there is no better process for the treatment of fluoride ions

Method used

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  • A method for comprehensive utilization of aluminum ash
  • A method for comprehensive utilization of aluminum ash
  • A method for comprehensive utilization of aluminum ash

Examples

Experimental program
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Effect test

Embodiment 1

[0043] After the aluminum ash is ground and passed through a 20-mesh sieve, it is mixed with ammonium bisulfate solution with a mass concentration of 30%, and the mixed slurry is heated to 200°C in a closed reaction kettle for reaction. The reaction time is 10 min. Ammonium bisulfate and aluminum ash The molar ratio of alumina in the medium is 4. During the heating reaction process, AlN is completely hydrolyzed, and the ammonia gas produced by AlN hydrolysis is completely absorbed by ammonium bisulfate to generate ammonium sulfate, thereby realizing zero discharge of ammonia gas. After the reaction, solid-liquid separation and washing are carried out to obtain a leaching solution with aluminum ammonium sulfate as the main component and a leaching residue with corundum as the main mineral composition to achieve 100% decomposition of aluminum nitride and ammonia gas absorption. Ammonia water or ammonia gas is passed into the obtained leaching solution for neutralization reaction...

Embodiment 2

[0045] The aluminum ash was ground and passed through a 20-mesh sieve and mixed with ammonium bisulfate solution with a mass concentration of 80%. The mixed slurry was heated to 70°C in a closed reaction kettle for reaction. The reaction time was 200 min. Ammonium bisulfate and aluminum ash The molar ratio of alumina in the medium is 16. During the heating reaction process, AlN is completely hydrolyzed, and the ammonia gas produced by AlN hydrolysis is completely absorbed by ammonium bisulfate to generate ammonium sulfate, thereby realizing zero discharge of ammonia gas. After the reaction, solid-liquid separation and washing are carried out to obtain a leaching solution with aluminum ammonium sulfate as the main component and a leaching residue with corundum as the main mineral composition to achieve 100% decomposition of aluminum nitride and ammonia gas absorption. Pass ammonia water or ammonia gas into the obtained leaching solution for neutralization reaction, solid-liquid...

Embodiment 3

[0047] The aluminum ash was ground and passed through a 20-mesh sieve and mixed with ammonium bisulfate solution with a mass concentration of 40%. The mixed slurry was heated to 180°C in a closed reaction kettle for reaction. The reaction time was 30 min. Ammonium bisulfate and aluminum ash The molar ratio of aluminum oxide in the medium is 8. During the heating reaction process, AlN is completely hydrolyzed, and the ammonia gas produced by AlN hydrolysis is completely absorbed by ammonium bisulfate to generate ammonium sulfate, thereby realizing zero discharge of ammonia gas. After the reaction, solid-liquid separation and washing are carried out to obtain a leaching solution with aluminum ammonium sulfate as the main component and a leaching residue with corundum as the main mineral composition to achieve 100% decomposition of aluminum nitride and ammonia gas absorption. Ammonia water or ammonia gas is passed into the obtained leaching solution for neutralization reaction, f...

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Abstract

The invention relates to a method for comprehensively utilizing aluminum ash, which belongs to the field of green recycling of solid waste. The steps are as follows: mixing aluminum ash and ammonium bisulfate solution, heating and reacting; carrying out solid-liquid separation; feeding ammonia water or ammonia gas into the obtained leaching solution for neutralization reaction and then solid-liquid separation; washing and heat preservation of the leaching residue obtained in the steps; Sodium sulfate is added to the ammonium sulfate solution obtained in the step; the ammonium sulfate solution obtained in the step is evaporated to obtain ammonium sulfate solid, and the ammonium sulfate solid is thermally decomposed at a low temperature to obtain ammonia gas and ammonium bisulfate liquid; the ammonia gas obtained in the step enters the Said step is the raw material source of ammonia gas or ammonia liquor; the obtained ammonium bisulfate liquid enters said step and is the raw material source of ammonium bisulfate solution. The invention has low energy consumption, strong process feasibility, complete AlN hydrolysis, no waste liquid and waste gas discharge in the process, and can realize efficient and green resource utilization of aluminum ash.

Description

technical field [0001] The invention relates to a method for comprehensively utilizing aluminum ash, which belongs to the field of green recycling of solid waste. Background technique [0002] Aluminum ash is produced in all aluminum melting processes such as aluminum electrolysis, aluminum processing, and recycled aluminum processing. It is listed as hazardous solid waste because it contains a certain amount of fluorine salts. At present, the utilization of aluminum ash is basically to recycle the metal aluminum in it, and most of the aluminum ash after the extraction of metal aluminum is directly stockpiled or landfilled. The accumulation of aluminum ash will occupy a large amount of land resources, and the harmless treatment will also cause toxic metal ions to flow into the groundwater to pollute water resources, especially the aluminum ash contains about 15~30% aluminum nitride, and aluminum nitride meets water. The stench produced by the decomposition of ammonia gas is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/34C01F7/44C01F7/54C04B35/10C04B35/626C04B35/66C04B35/622C04B38/00
CPCC01F7/34C01F7/441C01F7/54C01P2004/61C01P2006/80C04B35/10C04B35/62204C04B35/626C04B35/66C04B38/00C04B2235/656C04B2235/77C04B2235/96C04B2235/9607C04B38/0074C04B38/0067
Inventor 吴玉胜李来时
Owner SHENYANG POLYTECHNIC UNIV
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