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Method for synchronously recycling cryolite and carbon powder from electrolytic aluminum waste residue

A technology for electrolysis of aluminum waste residue and cryolite, which is applied in the preparation/purification of carbon, aluminum fluoride, aluminum halide, etc., can solve the problems of large capital investment and equipment, and is not a simple method of recycling cryolite and carbon powder. , to achieve the effect of low recycling cost, environmental protection and great social benefits

Active Publication Date: 2013-07-10
内蒙古霍煤鸿骏铝电有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] It can be seen from the above patent application that any method is not a simple and feasible method for recovering cryolite and carbon powder, and requires large capital investment and equipment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0018] Embodiment, carry out according to the following steps:

[0019] 1. Select the cathode material slag, waste cathode carbon block, cathode paste, and scum removed during electrolysis of aluminum from the electrolytic aluminum waste slag, and manually remove the furnace wall refractory material and silicon carbide material from the electrolytic aluminum waste slag;

[0020] 2. Pulverize the selected electrolytic aluminum waste residue and pass it through a 70-mesh sieve to obtain powder;

[0021] 3. Take 40Kg of powder, 50Kg of water, 6Kg of kerosene and 4Kg of ethanol by weight to make slurry A;

[0022] 4. Take 10Kg of sodium silicate and 20Kg of sodium aluminate according to the weight ratio, dissolve them in 70Kg of water, and prepare the aqueous solution B, which is called the separating agent;

[0023] 5. Add 40Kg of slurry A to 60Kg of aqueous solution B, stir for 2 minutes, and let stand for 5-10 minutes until the material is completely divided into upper, middle...

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PUM

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Abstract

The invention discloses a method for synchronously recycling cryolite and carbon powder from electrolytic aluminum waste residue, and belongs to the technical fields of chemical industry and environment friendliness. The method comprises the following steps of: crushing the electrolytic aluminum waste residues into a powder material, mixing with a size prepared from kerosene, ethanol and water; adding the size into a water solution containing sodium silicate and sodium aluminate; stirring and standing until the solution has upper, middle and low layers; taking the solution at the upper layer to eccentrically dewater, wash and dry so as to obtain the carbon powder; and taking the settlement at the lower layer to filter, wash and dry so as to obtain the cryolite, wherein the middle layer is the water solution containing sodium silicate and sodium aluminate. The method needs no larger fund investment, needs no expensive instruments and equipment, is simple and convenient to operate and low in cost, the fluorine pollution is reduced, the environment is protected, and the fluorine resource is saved, so that the method has large social and economic benefits.

Description

technical field [0001] The invention belongs to the technical fields of aluminum chemical industry and environmental protection, and specifically relates to a method for simultaneously recovering cryolite and carbon powder in electrolytic aluminum waste slag, which solves the problems of environmental pollution and waste slag recycling by electrolytic aluminum waste slag. Background technique [0002] Electrolytic aluminum waste slag includes electrolytic cell waste cathode slag, waste cathode carbon block, cathode paste, anode paste, scum taken out during electrolysis of aluminum, and tank wall refractory materials with cathode paste attached. According to estimates, every ton of aluminum produced will produce 10-20Kg of waste residue. Taking Guizhou as an example, the annual output of waste residue is more than 100,000 tons. Since these waste residues are fluorine-containing waste residues, they cannot be recycled in a simple way. Landfill for disposal. It has caused seri...

Claims

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Application Information

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IPC IPC(8): C01F7/54C01B31/02C01B32/05
Inventor 陈俊良骆相全
Owner 内蒙古霍煤鸿骏铝电有限责任公司