Comprehensive utilization method of secondary aluminum ash

A technology for secondary aluminum and aluminum ash, which is applied in the fields of aluminum compounds, chemical instruments and methods, preparation of alkali metal aluminate/aluminum oxide/aluminum hydroxide, etc., to achieve harmless treatment of secondary aluminum ash and cheap reaction agents , The effect of improving the recovery rate

Pending Publication Date: 2021-01-29
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a new method for comprehensive utilization of secondary aluminum ash, aiming at aluminum nitride in aluminum ash and a large amount of fluoride in electrolytic refining, to

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  • Comprehensive utilization method of secondary aluminum ash

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Embodiment 1

[0022] A method for comprehensive utilization of secondary aluminum ash, the concrete steps are as follows:

[0023] (1) Crush and grind secondary aluminum ash to 75μm-380μm with a crusher;

[0024] (2) Mix the crushed and finely ground aluminum ash in step (1) with the additives and then roast at 800°C for 4 hours, and recover the sintering gas as nitrogen; the additives are a mixture of sodium carbonate, oxidant sodium nitrate, and calcium carbonate; The molar ratio of sodium carbonate to aluminum oxide in aluminum ash is 1.4, the molar ratio of oxidant sodium nitrate to aluminum nitride in aluminum ash is 1.2, and the total molar ratio of calcium carbonate to fluoride and silicon dioxide in aluminum ash is 2.6 ;

[0025] (3) Dissolve the roasted clinker with sodium carbonate solution, the concentration of sodium carbonate is 2g / L, the liquid-solid ratio mL:g is 2:1, the dissolution temperature is 50°C, the dissolution time is 3h, solid-liquid separation, and the filtrate ...

Embodiment 2

[0029] A method for comprehensive utilization of secondary aluminum ash, the concrete steps are as follows:

[0030] (1) Crush and grind secondary aluminum ash to 75μm-380μm with a crusher;

[0031] (2) Mix the crushed and finely ground aluminum ash in step (1) with additives, and then roast at 800°C for 2 hours, and recover the sintering gas as nitrogen; the additives are a mixture of sodium carbonate, oxidant sodium peroxide, and calcium carbonate The mol ratio of aluminum oxide in sodium carbonate and aluminum ash is 1.8, the mol ratio of oxidant sodium peroxide and aluminum nitride in aluminum ash is 1.7, the total mol ratio of fluoride and silicon dioxide in calcium carbonate and aluminum ash is 3;

[0032] (3) Dissolve the roasted clinker with sodium carbonate solution, the concentration of sodium carbonate is 10g / L, the liquid-solid ratio mL:g is 5:1, the dissolution temperature is 65°C, the dissolution time is 1.5h, and the solid-liquid separation, The filtrate is so...

Embodiment 3

[0036] A method for comprehensive utilization of secondary aluminum ash, the concrete steps are as follows:

[0037] (1) Crush and grind the secondary aluminum ash to 75μm~380μm with a crusher;

[0038] (2) Mix the crushed and finely ground aluminum ash in step (1) with additives and then roast at 1000°C for 4 hours, and recover the sintering gas as nitrogen; the additives are a mixture of sodium carbonate, oxidant sodium percarbonate, and calcium carbonate The mol ratio of aluminum oxide in sodium carbonate and aluminum ash is 2.2, the mol ratio of oxidizer sodium percarbonate and aluminum nitride in aluminum ash is 2, the total mol ratio of fluoride and silicon dioxide in calcium carbonate and aluminum ash is 3.6;

[0039] (3) Dissolve the roasted clinker with sodium carbonate solution, the concentration of sodium carbonate is 5g / L, the liquid-solid ratio mL:g is 8:1, the dissolution temperature is 80°C, the dissolution time is 2h, solid-liquid separation, and the filtrate ...

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Abstract

The invention discloses a comprehensive utilization method of secondary aluminum ash, which comprises the following steps: crushing and grinding the secondary aluminum ash, uniformly mixing the crushed and ground aluminum ash with an additive, roasting, and recovering sintering gas; taking out a roasted clinker, cooling to room temperature, dissolving out by using dilute alkali liquor or water, carrying out solid-liquid separation to obtain a filtrate which is a sodium aluminate crude solution, adding calcium oxide, carrying out seed crystal decomposition and high-temperature calcination on asodium aluminate solution subjected to deep desilicication to obtain aluminum oxide, and returning insoluble filter residues which are fluorine-containing residues to an electrolytic cell for use; according to the method, aluminum oxide, nitride and fluoride in the aluminum ash are effectively separated, an aluminum oxide product is obtained, recycling of the nitride and the fluoride is achieved,and a new way for secondary comprehensive utilization of the aluminum ash is opened up.

Description

technical field [0001] The invention relates to the technical field of resource utilization of aluminum industrial waste, in particular to a new method for comprehensive utilization of secondary aluminum ash. Background technique [0002] The production of aluminum and recycled aluminum will produce a large amount of waste residue, and the annual production of aluminum ash is about 2.5 million tons or more. Aluminum ash can be divided into primary aluminum ash and secondary aluminum ash. The primary aluminum ash has a high aluminum content and is silver gray, also known as white ash; the secondary aluminum ash has a low aluminum content and is black, also known as black ash. The recycling of secondary aluminum ash is the focus of the comprehensive utilization of aluminum industry waste. At present, the recycling of aluminum ash can be mainly divided into the recovery of metal aluminum and alumina in aluminum ash, the recovery of salt in aluminum ash and the production of oth...

Claims

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Application Information

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IPC IPC(8): C01F7/04C01F7/08C01F7/06C01F7/14C01F11/22
CPCC01F7/04C01F7/0613C01F7/062C01F7/0693C01F7/08C01F7/14C01F11/22
Inventor 刘战伟魏杰颜恒维马文会杨万章谢克强吕国强于洁李绍元雷云伍继君魏奎先秦博陈正杰吴丹丹
Owner KUNMING UNIV OF SCI & TECH
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