Method for comprehensively utilizing 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: 2018-10-26
SHENYANG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

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  • Method for comprehensively utilizing aluminum ash
  • Method for comprehensively utilizing aluminum ash
  • Method for comprehensively utilizing aluminum ash

Examples

Experimental program
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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 pollution-free recycling of solid wastes. The process comprises the following steps: (1) mixing aluminum ash and an ammonium bisulfate solution, heating, and reacting; (2) performing the solid-liquid separation; (3) introducing ammonia water or ammonia gas into the obtained leachate to performing the neutralization reaction, and then performing the solid-liquid separation; (4) washing and thermally preserving the leaching residues obtained in step (2); (5) adding sodium sulfate into theammonium sulfate solution obtained in step (3); (6) evaporating the ammonium sulfate solution obtained in step (5), then obtaining ammonium sulfate solids, thermally decomposing the ammonium sulfate solids at a low temperature, and obtaining ammonia gas and ammonium hydrogen sulfate solution; (7) enabling the ammonia gas obtained in step (6) to enter the step (3) to be the raw material source of the ammonia gas or ammonium water, wherein the obtained ammonium hydrogen sulfate solution enters step (1) to be the raw material source of the ammonium hydrogen sulfate solution. The process is low inenergy consumption, high in process implementability, capable of realizing the complete ALN hydrolysis, free from emission of waste liquid and waste gas in the process, and capable of realizing efficient and pollution-free recycling of the 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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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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