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Industrial aluminum ash recycling method

An aluminum ash and industrial technology, which is applied in the field of harmless treatment and resource utilization of hazardous waste, can solve the problems of high energy consumption, large reuse limitations, and low content of effective substances in the recycling process of aluminum ash, achieving Significant social and economic benefits, simple process, and high effective substance content

Active Publication Date: 2018-07-03
ZHENGZHOU JINGWEI TECH & IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a method for recycling industrial aluminum ash, which aims to solve the problem of high energy consumption, serious environmental pollution, complicated procedures, high impurity content and effective substance content in the recycled materials prepared in the prior art. Technical problems of low performance, poor performance stability, and large reuse limitations

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Embodiment 1

[0024] A method for recycling industrial aluminum ash. The specific process steps of the method are: directly grind the aluminum ash to 270 mesh with a grinder; then put the ground powder into a regeneration furnace, and activate and regenerate it at a temperature of 1100°C 15h; after discharging, dump the regenerated powder into a pool for cooling water washing 12 times, each time the liquid-solid mass ratio is 1:7, and the washing water is recycled; the washed raw material is dried at 150°C to obtain the recycled industrial raw material A, Its XRD pattern is as follows figure 1 shown. According to the XRF component test, the alumina content in the recycled industrial raw material A is ≥80%, and the Na+K content is <1%. Recycled industrial raw material A has a wide range of applications, and can be used as a raw material in refractory materials, ceramic materials, abrasive materials, thermal insulation materials, and coarse industrial alumina industries.

Embodiment 2

[0026] A method for recycling industrial aluminum ash, which mainly includes the following process steps: mixing aluminum ash and high-purity silicon dioxide in proportions of 60% and 40% respectively, grinding the mixture to 325 meshes with a grinder; Put the powder into the regeneration furnace, activate and regenerate at 500°C for 24 hours; after discharging, pour the powder into a cold water pool for washing 15 times, each time the liquid-solid mass ratio is 1:10, and the washing water is recycled; after washing The raw material is dried at 200°C to obtain the recycled industrial raw material B. The XRF component test of the recycled industrial raw material B shows that the alumina content is ≥50%, and the Na+K content is <1%. This raw material can also be used in refractory materials, ceramic materials, Abrasive materials, thermal insulation materials, and coarse-grade industrial alumina industries are used as raw materials.

Embodiment 3

[0028] A method for recycling industrial aluminum ash, which mainly includes the following steps: mixing aluminum ash, aluminum hydroxide, and nano-α-alumina in proportions of 50%, 30%, and 20% respectively, and grinding the mixture to 200 mesh with a grinder ; Then put the ground powder into the regeneration furnace, and activate and regenerate at 800°C for 20 hours; after discharging, pour the powder into a cold water pool for washing 10 times, each time the liquid-solid mass ratio is 1:6, The washing water is recycled; and then dried at 80°C to obtain the recycled industrial raw material C. According to the XRF composition test, the alumina content in recycled industrial raw material C is ≥95%, and the Na+K content is less than 1%. This raw material can be used as a raw material in refractory materials, ceramic materials, abrasive materials, thermal insulation materials, and coarse industrial alumina .

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Abstract

The invention discloses an industrial aluminum ash recycling method, and belongs to the field of harmless treatment and recycling of hazardous waste. By adoption of the industrial aluminum ash recycling method, the problem that when an existing technique is used for resourceful treatment of aluminum ash, the procedures are complex, energy consumption is high, environmental pollution is caused, andprepared raw materials are poor in quality, high in impurity content and instable in performance are solved. The industrial aluminum ash recycling method comprises the steps that aluminum ash, a compound and an auxiliary are mixed in proportion and ground into powder with the granularity of 50-325 meshes; the ground mixed powder is activated for 1-24 hours at the temperature of 500-2500 DEG C; and then the activated powder is washed and dried according to the solid-to-liquid ratio of 1:1-10, and thus an aluminum renewable industrial raw material which is stable in performance, high in effective substance content, low in impurity content and good in economic benefit is prepared. According to the industrial aluminum ash recycling method, operation is easy, pollution is avoided, and the utilization rate of elements in aluminum ash is high; and the prepared industrial raw material is wide in application range and can be applied to the industries of refractory materials, ceramic materials,grinding materials, thermal insulation materials and coarse industrial aluminum oxide.

Description

technical field [0001] The invention relates to the technical field of harmless treatment and resource utilization of hazardous waste, in particular to a method for recycling industrial aluminum ash. Background technique [0002] Aluminum ash is a hazardous solid waste of the aluminum industry with a huge output. In the production process of the electrolytic aluminum industry, due to the process of anode replacement, electrolytic tank overhaul, high-temperature alumina melting and other processes, a large amount of aluminum-containing waste residue will be produced, and its main components are metallic aluminum, aluminum oxide, aluminum nitride, silicon dioxide, Magnesium Oxide, Calcium Oxide, etc. The aluminum ash taken out from the electrolytic cell is called primary aluminum ash, which contains a relatively high content of metal aluminum. Generally, the primary aluminum ash needs to be fried at high temperature to recover metal aluminum, and the remaining waste residue i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00B09B5/00
CPCB09B3/00B09B5/00Y02W30/20
Inventor 王旭东冯晓强牛文军王立志张敬一
Owner ZHENGZHOU JINGWEI TECH & IND
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