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Dump leaching processing method for waste furnace-constructing refractory materials of aluminum electrolytic bath

A technology for waste and refractory materials of aluminum electrolytic cells, which is applied in chemical instruments and methods, alkali metal fluorides, carbonate preparations, etc. cost effect

Inactive Publication Date: 2017-11-03
YUNNAN RUNXIN ALUMINUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most electrolytic aluminum enterprises mainly use landfill or storage for waste furnace building refractory materials, which not only needs to occupy a lot of land, invest a lot of operating funds and management costs, but also cause pollution to the ecological environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A method for heap leaching treatment of waste furnace building refractory materials in aluminum electrolytic cells, the method steps are as follows:

[0018] A. Sorting the slag from the overhaul of the aluminum electrolytic cell, and selecting the waste refractory materials for furnace construction;

[0019] B. Use a jaw crusher to crush the waste refractory materials for furnace construction, and use a 50-mesh sieve to screen after the crushing is completed;

[0020] C. Perform one pre-leaching, one leaching, and four washings of the waste furnace building refractory materials with a particle size of 0.15cm to 0.8cm after crushing; After soaking for 3 days in a closed pre-leaching tank with a 2% NaOH solution, transfer the pre-soaked slag and the pre-soaked solution to the subsequent leaching tank, and send the ammonia gas generated by the pre-leaching into the sulfuric acid washing system Ammonium sulfate is produced as a by-product; the bulk specific gravity of pre...

Embodiment 2

[0024] A method for heap leaching treatment of waste furnace building refractory materials in aluminum electrolytic cells, the method steps are as follows:

[0025] A. Sorting the slag from the overhaul of the aluminum electrolytic cell, and selecting the waste refractory materials for furnace construction;

[0026] B. Use a jaw crusher to crush waste refractory materials for furnace construction, and then screen after crushing;

[0027] C. Perform one pre-leaching, one leaching, and four washings of the waste furnace refractories with a particle size of 0.3cm to 1cm after crushing; when the first batch of waste furnace refractories is processed, the first pre-leaching is to send the waste furnace refractories into In the closed pre-leaching tank, the NaOH solution with a mass concentration of 4% is used to spray and soak for 3 days, and then the pre-soaking residue and the pre-soaking liquid are transferred to the subsequent leaching tank. By-product ammonium sulfate; the he...

Embodiment 3

[0031] A method for heap leaching treatment of waste furnace building refractory materials in aluminum electrolytic cells, the method steps are as follows:

[0032] A. Sorting the slag from the overhaul of the aluminum electrolytic cell, and selecting the waste refractory materials for furnace construction;

[0033] B. Use a jaw crusher to crush waste refractory materials for furnace construction, and then screen after crushing;

[0034] C. Perform one pre-leaching, one leaching, and four washings of the waste furnace building refractory materials with a particle size of 1cm to 1.5cm after crushing; when the first batch of waste furnace building refractory materials is processed, the first pre-leaching is to send the waste furnace building refractory materials into In the closed pre-leaching tank, the NaOH solution with a mass concentration of 3% is used to spray and soak for 3 days, and then the pre-soaked slag and the pre-soaked liquid are transferred to the subsequent leach...

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Abstract

Disclosed is a d ump leaching processing method for waste furnace-constructing refractory materials of an aluminum electrolytic bath. The method comprises the following steps that the waste furnace-constructing refractory materials which are sorted from bath residues generated in overhaul the aluminum electrolytic bath are crushed and screened, and then pre-leaching, dump leaching and washing are circularly conducted on the waste furnace-constructing refractory materials; generated pre-leached liquid and dump leached liquid are subjected to oxidative decyanide treatment and then are filter-pressed; and CO2 gas is led in filter-pressed filtered liquid, then the filter-pressed filtered liquid is subjected to carbon-neutralization treatment, through concentration and crystallization, sodium salt is recovered, and mixture of fluorinated NaHCO3, fluorinated Na2CO3 and NaF is obtained. By means of the dump leaching processing method, innocent treatment and comprehensive using of the waste furnace-constructing refractory materials of the aluminum electrolytic bath can be achieved.

Description

technical field [0001] The invention relates to the technical field of processing methods for aluminum electrolysis waste furnace building refractory materials. Background technique [0002] The electrolytic cell of the electrolytic aluminum factory is the core equipment for the production of electrolytic aluminum. During the production process of aluminum electrolysis, the waste and old refractory materials for furnace construction are caused by the penetration and corrosion of the inner lining of the electrolytic cell due to the penetration and corrosion of the high temperature electrolyte, resulting in deformation and cracking of the lining structure of the aluminum electrolytic cell. etc., when the high-temperature aluminum liquid and electrolyte penetrate into the tank lining from these deformed and cracked cracks, resulting in the failure of the normal production of the electrolytic tank and the shutdown of the tank for repair. Because the refractory material of the ta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/06C01C1/242C01D3/02C01D7/07
CPCC25C3/06C01C1/242C01D3/02C01D7/07
Inventor 杨大锦杨万章梁可陈本松张燕刘俊场徐加泉江俊
Owner YUNNAN RUNXIN ALUMINUM
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