Regeneration treatment method for waste cathode carbon blocks of aluminum electrolytic cell

A technology of waste cathode carbon block and aluminum electrolytic cell, which is applied in the field of solid waste treatment of aluminum electrolysis industry and can solve the problems of large secondary pollution and the like

Inactive Publication Date: 2018-04-13
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this kind of treatment method needs to be filtered and washed many times during the treatment process, resulting in a large amount of cyanide-containing and fluorine-containing wastewater, causing

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] In the untreated waste cathode carbon block, the fluorine content (percentage by weight) is 7.12%, the cyanide content (leach solution content) is 23.77mg / L, and the ash content is 30.52%. Put it into the heat treatment resistance furnace in block form (40-50mm), adjust the atmosphere by introducing nitrogen gas, and then heat it at 1700°C for 2 hours under normal pressure, then cool it naturally. Percentage by weight) is less than 0.01%, cyanide is not detected, and ash content (percentage by weight) is 0.5%.

Embodiment 2

[0024] In the untreated waste cathode carbon block, the fluorine content (percentage by weight) is 7.12%, the cyanide content (leach solution content) is 23.77mg / L, and the ash content is 30.52%. After the waste is crushed and screened, the waste is crushed and ground into particles Form (0.3 ~ 0.5mm), mixed with 50% anthracite, put it into the heat treatment resistance furnace, adjust the atmosphere by introducing nitrogen, and control the pressure in the furnace at 0.05atm, after 2 hours of treatment at 1500 ° C, cool naturally, and waste In the cathode carbon block, the fluorine content (weight percentage) is less than 0.1%, cyanide is not detected, and the ash content (weight percentage) is 0.7%.

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PUM

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Abstract

The invention discloses a regeneration treatment method for waste cathode carbon blocks of an aluminum electrolytic cell and belongs to the technical field of solid waste treatment in the aluminum electrolysis industry. The main treatment process comprises the steps of crushing, screening, toxicity inhibition, batching and pressure-controlled heat treatment. After waste cathode carbon block materials of the aluminum electrolytic cell are crushed and screened, toxic inhibitors of hydrogen peroxide, potassium permanganate, hypochlorite and the like are added, then carbonaceous materials of anthracite, calcined petroleum coke, waste anode carbon blocks, anode scraps and the like are blended to serve as furnace-in raw materials, and the furnace-in raw materials are placed in a resistance furnace to be subjected to heat treatment at the ordinary pressure (1200-1800 DEG C) or the control pressure (1000-1600 DEG C and 0.01-0.5 atm). Fluoride volatilized from flue gas can be used for producingfluoride salt electrolytes after being cooled and crystallized, treated materials do not contain any contaminant, the carbon content is up to 99%, the conductivity is good, the specific surface areais large, the treated materials can be used for producing various carbon products, waste is turned into wealth, and environment-friendly resource application of overhaul of the waste cathode carbon blocks of the aluminum electrolytic cell is achieved.

Description

technical field [0001] The invention belongs to the technical field of solid waste treatment in the aluminum electrolysis industry, and in particular relates to a treatment and regeneration technology of a waste cathode carbon block material of an aluminum electrolysis cell. technical background [0002] In the production of aluminum electrolysis, large prebaked anode electrolytic cells are commonly used, and the bottom cathode uses carbonaceous graphite materials. In aluminum electrolysis production, the graphite cathode will absorb a large amount of fluoride salt when it is eroded by electrolyte and aluminum metallurgy, and a small amount of cyanide will be generated near the steel rod. At present, the life of the electrolytic cell is about 6 to 8 years. During the overhaul, the lining of the electrolytic cell needs to be replaced, and a large amount of solid waste including cathode carbon blocks will be produced, which contain about 10 to 30% of fluoride, Spent cathode c...

Claims

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Application Information

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IPC IPC(8): C25C3/08C25C3/18
CPCC25C3/08C25C3/18
Inventor 刘风琴赵洪亮王焕雪刘伟张拥军王玲
Owner UNIV OF SCI & TECH BEIJING
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