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Treatment of aluminum electrolytic-cell waste lining

An aluminum electrolytic cell and waste cell lining technology, which is applied in the removal of solid waste and other directions, can solve the problems of low production efficiency and slow reaction speed, and achieve the effects of low processing cost, low price and easy industrialization.

Active Publication Date: 2007-01-17
河南华慧有色工程设计有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of industrial implementation, this method is limited by the operating performance of the rotary kiln, and has the disadvantages of slow reaction speed and low production efficiency.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Add 1,000 grams of waste tank lining, 100 grams of quicklime, and 50 grams of fly ash to the raw materials for making dough, mix the three materials evenly, grind them until the particle size is less than 0.074mm, make dough, and put the dough into the shaft kiln Or roast in a fluidized furnace, the roasting temperature is 900°C, and the roasting time is 90 minutes. After roasting, the material is ground, leached with 5% lime water, filtered, and the filtrate is sent to alumina production, and the filter residue is used as cement raw material.

Embodiment 2

[0018] Mix 1,000 grams of waste tank lining, 230 grams of quicklime, and 140 grams of fly ash into the raw materials for pellet making, mix the three materials evenly, grind them until the particle size is less than 0.074mm, make pellets, and put the pellets into the shaft kiln Or roast in a fluidized bed furnace, the roasting temperature is 1000°C, the roasting time is 60 minutes, the roasted material is pulverized, leached with 1.5% lime water, filtered, the filtrate is sent to the soda ash production process, and the filter residue is used as a refractory material or cement raw material.

Embodiment 3

[0020] Mix 1,000 grams of waste tank lining, 400 grams of quicklime, and 250 grams of fly ash into the raw materials for pellet making, mix the three materials evenly, grind them until the particle size is less than 0.074mm, and make pellets, and put the pellets into the shaft kiln Or roast in fluidized furnace, roasting temperature is 1100°C, roasting time is 30min, after roasting, the material is pulverized, leached with 0.5% lime water, filtered, the filtrate is sent to alumina production, and the filter residue is used as a raw material for refractory materials.

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PUM

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Abstract

A process for reclaiming the used liner of aluminum electrolyzer includes such steps as crushing, mixing it with powdered coal ash and calcium lime, grinding, sphericizing, calcining, grinding, immersing in lime milk for removing residual soluble Fe ions, and filtering to obtain NaOH solution and the dregs used as the raw material to prepare cement and refractory.

Description

technical field [0001] A method for treating waste linings of aluminum electrolytic cells, which relates to the waste electrolytic cell linings in the process of electrolytic production of metal aluminum, especially the harmless treatment of all waste cell linings including waste cathode carbon blocks and waste refractory materials. treatment method. Background technique [0002] The waste tank lining produced in the production process of electrolytic aluminum contains a large amount of soluble fluoride and cyanide, which is directly stacked in the open air and pollutes the atmosphere, and is mixed with rainwater into rivers to pollute surface water sources; landfill treatment also pollutes the soil, and infiltrates into underground pollution with rainwater Groundwater seriously endangers human health and causes great harm to the growth of animals and plants. The pollution of waste tank linings has become one of the important issues affecting the comprehensive, coordinated ...

Claims

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Application Information

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IPC IPC(8): B09B3/00C25C3/08
Inventor 李旺兴陈喜平王玉赵清杰罗钟生
Owner 河南华慧有色工程设计有限公司
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