Method for processing waste cell-lining of aluminum cell using coal slack

An aluminum electrolytic cell and waste cell lining technology, applied in the field of electrolysis, can solve the problems of low production efficiency, high relative cost, slow reaction speed, etc., and achieve the effects of reduced processing cost, low price and wide source.

Inactive Publication Date: 2009-02-04
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This technology allows us to efficiently recycle different types of material during the production of anodes made up mainly by molybdenum (Mo) metal. By adding certain chemicals like silicon dioxide containing calcium oxides onto this mixture, it becomes more effective at reducing emissions compared with traditional methods such as burning off slags. Additionally, we found out how these chemistries were able to transform waste into valuable products - called sinterings – through processes similar to those described earlier. These technical results help reduce costs while improving efficiency in processing waste.

Problems solved by technology

This patented describes various techniques related to improving the disposability and recovery value of spent battery tissue containing metallurgical elements like iron, manganese, copper, zinc, chromite, calcium, ceramics, and rare earth stones. However, these processes involve different chemical compositions and concentrations depending upon factors like acid mist neutrality. These challengments require efficient and economically feasible solutions without generating excessive effluents during their cleanup operations.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The waste aluminum electrolytic cell lining and coal gangue are pre-broken and ground, and 1000 grams of waste tank lining with a particle size of less than 0.2 mm, 100 grams of coal gangue with a particle size of less than 0.5 mm, and 350 grams of quicklime are weighed, and the three materials are mixed evenly. The mixed material is sent into a roasting furnace of the prior art for roasting, at a roasting temperature of 900° C., the roasting reaction time is 70 minutes, the roasted material is pulverized, and the fine powder roasted product is immersed in 5% lime water with a concentration of 5%, and leached for 30 min. After filtering by the method of the prior art, the filtrate NaOH can be used for industrial production, and the main component of the filter residue is CaF 2 , CaSiO 4 , Ca 4 Si 2 o 7 f 2 , Nepheline and β-alumina, used as cement raw materials or solid materials for road filling materials.

Embodiment 2

[0028] The waste aluminum electrolytic cell liner and coal gangue are crushed and ground in advance, and 1000 grams of waste tank liner with a particle size of less than 0.2 mm, 150 grams of coal gangue with a particle size of less than 0.5 mm, and 250 grams of quicklime are weighed, and the three materials are mixed evenly. Put the mixed material into the existing roasting device for roasting, the roasting temperature is 1000°C, the roasting reaction time is 60min, the material after roasting is pulverized, and the calcined material with a concentration of 3% is immersed in the superfine powder roasted material, leached for 40min, and passed through the existing Method After filtering, the filtrate NaOH can be used for industrial production, and the filter residue can be used as cement raw material or solid material for road filling materials.

Embodiment 3

[0030] The waste aluminum electrolytic cell liner and coal gangue are crushed and ground in advance, and 1000 grams of waste tank liner with a particle size of less than 0.2 mm, 200 grams of coal gangue with a particle size of less than 0.5 mm, and 150 grams of quicklime are weighed, and the three materials are mixed evenly. Put the mixed material into the roasting device of the prior art for roasting, the roasting temperature is 1100°C, the roasting reaction time is 50min, the material after roasting is pulverized, and the calcined product is submerged in lime water with a concentration of 1.5%, leached for 50min, and filtered , the filtrate NaOH can be used for industrial production, and the filter residue can be used as a cement raw material or a solid material for road filling materials.

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Abstract

The present invention provides a method for using coal gangue to dispose an aluminum reduction cell waste slot liner. The method comprises the steps as follows: after being crushed and milled, the coal gangue with the adding quantity of 10 percent to 30 percent of the quantity of the waste slot liner and quick lime with the adding quantity of 5 percent to 35 percent of the quantity of the waste slot liner are mixed with the waste slot liner uniformly; the material is calcined for 40-70 minutes at the temperature of 900-1200 DEG C; the calcined material is milled until the granularity is less than 0.074mm; residual soluble F<-> is leached by limewater with the concentration of 0.5 percent to 5 percent, the leaching time is 30-60 minutes; then the material is filtered; filtrate is used for other purpose; filter residue is recycled as usable material. The method achieves the comprehensive using purpose of treating a waste with another waste and changing waste into valuable. The method has the advantages of reliable technology and wide source and low price of raw material, is easy for industrial treatment and also completely and effectively uses the self thermal value of waste electrode and the thermal value of the coal gangue during the disposing process, thereby ensuring the disposing cost to be reduced and disposal effect to be good. The treatment filtrate is recycled and reused, and the filter residue is directly used as cement raw material or filling material for road construction.

Description

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Claims

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Application Information

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Owner KUNMING UNIV OF SCI & TECH
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