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Method for secondary aluminum ash recycling

A secondary aluminum and resource-based technology, applied in the field of resources and environment, can solve the problems of inability to extract, accumulate and occupy, pollute the environment, etc., achieve high practical value, reduce operating costs and energy consumption.

Active Publication Date: 2019-04-26
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Secondary aluminum ash still contains 5-8% elemental aluminum, which cannot be further extracted by frying ash
The amount of secondary aluminum ash is very large, which leads to accumulation of land and serious environmental pollution. However, the alumina content in secondary aluminum ash accounts for 60-70%, and some even as high as 80-90%, which is higher than that of alumina in bauxite. It is even higher, so it is a pity to dispose of it as garbage
However, since aluminum ash contains active substances such as elemental aluminum, aluminum nitride, and aluminum carbide, a large amount of hydrogen, methane, and ammonia will be released when environmental conditions, especially acid-base conditions, change, so the chemical stability of the product clear water brick is quite Difference

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  • Method for secondary aluminum ash recycling

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Effect test

Embodiment 1

[0029] The secondary aluminum ash is ground and passed through a 10-mesh sieve; add 15% caustic soda (NaOH) solution to it according to 15% sieved material and 1% anti-boiling agent (the mass ratio of activated carbon and porous synthetic phenolic resin is 1:2) , fully react under normal pressure, the elemental aluminum in the aluminum ash reacts with caustic soda to produce hydrogen (H 2 ), elemental aluminum is oxidized into sodium metaaluminate, and aluminum carbide and aluminum nitride in aluminum ash react with caustic soda to produce methane (CH 4 ) and ammonia (NH 3 ), under stirring conditions until no bubbles are seen, the ammonia gas becomes ammonium fertilizer after being absorbed by hydrochloric acid, and the remaining hydrogen and methane are collected, which can be used for system heating; type of alumina; filter the undissolved aluminum slag, and make bricks from the filter residue, and dilute the obtained filtrate to 1.5 times to increase the unsaturation of a...

Embodiment 2

[0031] The secondary aluminum ash is ground and passed through a 20-mesh sieve; add 20% caustic soda (NaOH) solution according to 25% of the sieved material and 3% of the anti-boiling agent (the mass ratio of activated carbon and porous synthetic phenolic resin is 2:2), Fully react under normal pressure, the elemental aluminum in the aluminum ash reacts with caustic soda to produce hydrogen (H 2 ), elemental aluminum is oxidized into sodium metaaluminate, and aluminum carbide and aluminum nitride in aluminum ash react with caustic soda to produce methane (CH 4 ) and ammonia (NH 3), under stirring conditions until no bubbles are seen, the ammonia gas becomes ammonium fertilizer after being absorbed by sulfuric acid, and the remaining hydrogen and methane are collected, which can be used for system heating; type of alumina; filter the undissolved aluminum slag, and make bricks from the filter residue, and dilute the obtained filtrate to 2.5 times to increase the unsaturation of...

Embodiment 3

[0033] The secondary aluminum ash is ground and passed through a 40-mesh sieve; add 25% caustic soda (NaOH) solution and 5% anti-boiling agent (the mass ratio of activated carbon and porous synthetic phenolic resin is 1:2) according to 35% of the sieved material, Fully react under normal pressure, the elemental aluminum in the aluminum ash reacts with caustic soda to produce hydrogen (H 2 ), elemental aluminum is oxidized into sodium metaaluminate, and aluminum carbide and aluminum nitride in aluminum ash react with caustic soda to produce methane (CH 4 ) and ammonia (NH 3 ), under stirring conditions until no bubbles are seen, ammonia gas becomes ammonium fertilizer after being absorbed by phosphoric acid, and the remaining hydrogen and methane are collected and can be used as energy materials for export; under 500°C high-pressure closed conditions, further stripping Alumina with insoluble crystal form; filter the undissolved aluminum slag, and use the obtained filter residu...

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Abstract

The invention relates to the field of resources and environments, in particular to a method for secondary aluminum ash recycling. The method comprises the following steps that S1, secondary aluminum ash is ground and then sieved, a caustic soda (NaOH) solution and an anti-boiling agent are added into a sieved object, a full reaction is conducted at the normal pressure till no bubble is generated,and ammonia, hydrogen and methane are collected; and S2, under the condition of the high temperature and high pressure, filtrate obtained after filtering is diluted, the diluted filtrate is cooled tothe room temperature, and aluminum hydroxide crystals are separated out; and aluminum hydroxide obtained after filtering is calcined and dehydrated to obtain aluminum oxide. The method for efficientlyrecycling the secondary aluminum ash is provided.

Description

technical field [0001] The invention relates to the field of resources and environment, in particular to a method for secondary aluminum ash recycling. Background technique [0002] Aluminum ash is a solid waste that is inevitably produced in the production process of electrolytic aluminum, cast aluminum and other aluminum industries. According to estimates, the secondary aluminum ash produced by my country's aluminum industry reaches 3.5-4 million tons per year. The primary aluminum ash contains 15-30% metallic aluminum, and the secondary aluminum ash is formed after most of the elemental aluminum is recovered by the ash frying method. Secondary aluminum ash still contains 5-8% elemental aluminum, which cannot be further extracted by the method of frying ash. The amount of secondary aluminum ash is very large, which leads to accumulation of land and serious environmental pollution. However, the alumina content in secondary aluminum ash accounts for 60-70%, and some even as...

Claims

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Application Information

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IPC IPC(8): C01F7/14C01F7/44C01B3/08C01C1/02C05C3/00C07C1/32C07C9/04
CPCC01B3/08C01C1/026C01F7/144C01F7/441C05C3/00C07C1/327C07C9/04Y02E60/36
Inventor 靳强单爱党
Owner SHANGHAI JIAO TONG UNIV
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