Comprehensive utilization method of aluminum electrolytic carbon residue

A technology of aluminum electrolysis and carbon slag, applied in the field of aluminum electrolysis, can solve the problems of slowing down the dissolution rate of alumina, taking away electrolyte and heat, incomplete recovery, etc., achieving the effect of easy separation, easy control, and reduced power consumption

Inactive Publication Date: 2019-05-17
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When a large amount of carbon slag floats on the surface of the aluminum electrolyte, a current path will pass through, and the carbon slag will form between the carbon anode and the cathode, resulting in current loss; when the carbon slag content in the electrolyte exceeds a certain range, the alumina dissolution rate will slow down. Slow, deposits on the bottom of the furnace, leading to deterioration of tank conditio

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A comprehensive utilization method of aluminum electrolytic carbon slag, comprising the following steps:

[0039] (1) Crushing and screening: 10kg of aluminum electrolytic carbon slag (specific composition: Na 3 AlF 6 45wt.%, CaF 2 9wt.%, Al 2 o 3 8wt.% and C 38wt.%) are roughly crushed by a jaw crusher to obtain carbon slag particles below 10mm; then ball milled in a ball mill for 4 hours and passed through a 200 mesh sieve to obtain carbon slag powder, wherein the carbon slag particles with a particle size of less than 200 mesh Slag not less than 80%;

[0040](2) Flotation: put the carbon slag powder that step (1) makes into flotation cell, add 17kg water to adjust slurry, obtain the slurry that concentration is 37wt.%; Add 13.5% to the slurry of flotation cell earlier gram inhibitor water glass, dosing and stirring time is 8min; Then add 8.64 grams of collector kerosene, dosing and stirring time is 8min; Then under the condition of 2000rpm in flotation machin...

Embodiment 2

[0048] A comprehensive utilization method of aluminum electrolytic carbon slag, comprising the following steps:

[0049] (1) Crushing and screening: 10kg of aluminum electrolytic carbon slag (specific composition: Na 3 AlF 6 47wt.%, CaF 2 9wt.%, Al 2 o 3 6wt.% and C 39wt.%) are roughly crushed by a jaw crusher to obtain carbon slag particles below 10mm; then ball milled in a ball mill for 4 hours and passed through a 200 mesh sieve to obtain carbon slag powder, wherein the carbon slag particles with a particle size of less than 200 mesh Slag not less than 80%;

[0050] (2) Flotation: put the carbon slag powder prepared in step (1) into the flotation cell, add 18.6kg water to adjust the slurry, and obtain a slurry with a concentration of 35wt.%; first add 14.0 grams of inhibitor water glass, dosing and stirring time is 5min; Add 8.87 grams of collector kerosene again, dosing and stirring time is 10min; Then under the condition of 1800rpm in flotation machine speed, carry...

Embodiment 3

[0058] A comprehensive utilization method of aluminum electrolytic carbon slag, comprising the following steps:

[0059] (1) Crushing and screening: 10kg of aluminum electrolytic carbon slag (specific composition: Na 3 AlF 6 48wt.%, CaF 2 7wt.%, Al 2 o 3 9wt.% and C 36wt.%) are roughly crushed by a jaw crusher to obtain carbon slag particles below 10mm; then ball milled in a ball mill for 4 hours and passed through a 200 mesh sieve to obtain carbon slag powder, wherein the carbon slag particles with a particle size of less than 200 mesh Slag not less than 80%;

[0060] (2) Flotation: put the carbon slag powder that step (1) makes into the flotation cell, add 15kg water to adjust slurry, obtain the slurry that concentration is 40wt.%; Add 12.75% to the slurry of flotation cell earlier gram inhibitor water glass, dosing and stirring time is 10min; Add 8.25 grams of collector kerosene again, dosing and stirring time is 5min; Then under the condition of 2500rpm in flotatio...

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PUM

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Abstract

The invention relates to the technical field of aluminum electrolysis, in particular to a comprehensive utilization method of aluminum electrolytic carbon residue. According to the comprehensive utilization method, the aluminum electrolytic waste carbon residue is crushed, screened and ball-milled, then floatation is conducted, water glass is treated as a depressor, kerosene is treated as a capture agent, and carbon is obtained; an electrolyte discharged from the bottom of a floatation tank is filtered, and a filter-out material is obtained; a mixed solution containing HNO3 and Al(NO3)3 is added in the filter-out material, a reaction is conducted under 60-65 DEG C for 1-1.5 h, and a solid-liquid mixture is obtained; and solid-liquid separation is conducted on the solid-liquid mixture, filter residue is obtained, the filter residue is leached with a high concentration hydrofluoric acid solution, solid-liquid separation is conducted, and AlF3 is obtained. According to the comprehensive utilization method, carbon powder and the electrolyte in the aluminum electrolytic wasted carbon residue are effectively separated, and environment pollution caused by fluorine emission is avoided. Therecycled carbon powder and aluminum fluorine can be returned to be used for aluminum electrolysis, raw material consumption of aluminum electrolysis is lowered, and the environmental benefits and theeconomic benefits are remarkable.

Description

technical field [0001] The invention relates to the technical field of aluminum electrolysis, in particular to a comprehensive utilization method of aluminum electrolysis carbon slag. Background technique [0002] Modern large-scale prebaked aluminum electrolytic cells usually use carbon products as anodes for electrolytic production. The carbon anode working in the electrolyte sometimes has different degrees of particle shedding, resulting in the formation of carbon residue, which will greatly affect the performance of the electrolyte and production indicators. [0003] As the production capacity of aluminum electrolysis continues to increase, the demand for carbon anodes continues to increase, resulting in a gradual decline in the quality of carbon anodes. During aluminum electrolysis, due to the selective oxidation of the carbon anode, the aggregate particles are not completely burned, but enter the electrolyte solution, and carbon slag is thus produced. Normally, the c...

Claims

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Application Information

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IPC IPC(8): B09B3/00B09B5/00B03D1/02B03D1/018C25C3/06B03D101/02B03D101/06
Inventor 刘海涛王维王可桢陈位杰黄运红
Owner HENAN UNIV OF SCI & TECH
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