Comprehensive utilization method of waste and old cathode carbon blocks of aluminium electrolytic bath

An aluminum electrolytic cell waste and cathode carbon block technology, which is applied in the removal of solid waste and other directions, can solve the problems of serious slag loss of aggregates, inability to make full use of waste cathodes, and difficulty in ensuring the purity of carbon materials, etc., so as to save resources and reduce production. cost effect

Inactive Publication Date: 2011-08-24
陈俊贤
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it is only mentioned that the fluoride salt and alumina in the carbon material are deashed by the flotation method, and it is difficult to ensure the purity of the carbon material only by the flotation method in actual production; the other patent mentions that the obtained carbon powder is used as a powder used to produce carbon products
[0007] The article "Recycling and Utilization of Waste Cathode Lining of Aluminum Electrolytic Cells" published in the fourth issue of 2001 in "Mineral Protection and Utilization" mentioned that

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0018] Example 1

[0019] A method for producing blast furnace carbon blocks from waste cathode carbon blocks from aluminum electrolytic cells, and its operation steps are as follows:

[0020] (1) Crush the waste cathode carbon blocks of the aluminum electrolytic cell, and separate out the steel rods, refractories, electrolytes, etc.

[0021] (2) Use a jaw crusher to crush the waste cathodes of the aluminum electrolysis cell to a particle size of 10-50mm. The jaw crusher is crushed by an impact crusher. The crushed material of the impact crusher is divided into +12 through a three-stage vibrating screen. , 12~6mm, 6~3mm, 3-0mm several kinds of grain grades for use (greater than 12mm particle size is fed back to the crusher), and then use the high-pressure suspension roller mill to crush part of the cathode carbon block to 200 mesh powder.

[0022] (3) The grinded aluminum electrolytic cell waste cathode particle size material and powder material are reacted with caustic alkali solutio...

Example Embodiment

[0026] Example 2

[0027] A method for producing electric furnace carbon blocks from waste cathode carbon blocks of aluminum electrolytic cells, the operation steps of this embodiment are:

[0028] (1) Crush the waste cathode carbon blocks of the aluminum electrolytic cell, and separate out the steel rods, refractories, electrolytes, etc.

[0029] (2) Use a jaw crusher to crush the waste cathodes of the aluminum electrolytic cell to a particle size of 10-50mm. The jaw crusher is crushed by an impact crusher, and the crushed material from the impact crusher is divided into +8 through a double-layer vibrating screen. , 8~4mm, 4~0mm, and then use a high-pressure suspension roller mill to crush the cathode carbon block to 200 mesh powder.

[0030] (3) Add various particle size materials and waste cathode powders of aluminum electrolytic cells ground by a mill into concentrated hydrochloric acid and keep stirring. After 30 minutes of reaction, the leached solubles are filtered out.

[0031]...

Example Embodiment

[0034] Example 3

[0035] A method for producing paste from waste cathode carbon blocks in an aluminum electrolytic cell, and its operation steps are as follows:

[0036] (1) Crush the waste cathode carbon blocks of the aluminum electrolytic cell, and separate out the steel rods, refractories, electrolytes, etc.

[0037] (2) Use a jaw crusher to crush the filtered waste cathodes of aluminum electrolysis cells to 10-50mm particle size materials, and use a high-pressure suspension roller mill to crush part of the cathode carbon block particle size materials to 200 mesh powder materials.

[0038] (3) React the ground aluminum electrolytic cell waste cathode powder with concentrated hydrochloric acid, and then filter.

[0039] (4) The processed aluminum electrolytic cell waste cathode powder obtained by filtration is dried by a dryer. The dried waste cathode powder requires a carbon content of 85% or more (wt), which includes additives and other impurities. The total mass of the substances...

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Abstract

The invention relates to a comprehensive utilization method of waste and old cathode carbon blocks of an aluminium electrolytic bath, which is characterized in that after being treated by sorting, crushing, pulverizing, ash removing and drying, the waste and old cathode carbon blocks are used as raw materials for producing blast furnace carbon blocks, electric furnace carbon blocks, electrolytic bath cathode carbon blocks, electrolytic bath side carbon blocks, electrolytic carbon blocks, self-roasting carbon blocks or carbon paste. In the comprehensive utilization method, the recycling of dangerous waste and the cathode carbon block different for being practically disposed and applied, the harmless treatment and comprehensive utilization of the waste and old cathode carbon blocks are realized, the waste becomes valuable, simultaneously the use of anthracite, metallurgical coke, tar coke and petroleum coke is reduced, the resource is saved and the production cost is reduced.

Description

technical field [0001] The invention relates to a comprehensive utilization method of waste and old cathode carbon blocks of an aluminum electrolytic cell, belonging to the technical field of non-ferrous metallurgy and environmental protection. Background technique [0002] The waste cathode carbon block used in the aluminum electrolysis process generally contains carbon, sodium fluoride, cryolite, aluminum fluoride, calcium fluoride, alumina, etc., of which the carbon content is about 50-70%, electrolyte (including fluoride salt and alumina ) is about 50-30%, and the cyanide content is about 0.2%; the fluorine content of the leaching liquid of solid waste of electrolytic aluminum cathode furnace materials (mainly cathode carbon blocks and refractory materials) can reach 6000 mg / L, CN - The content can reach 10-40 mg / L, exceeding the standard requirements of the national "Hazardous Waste Identification Standard-Leach Toxicity Identification" (F - <50 mg / L, CN - >1 m...

Claims

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Application Information

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IPC IPC(8): B09B3/00C25C3/08C04B35/52C04B35/528
Inventor 陈俊贤王建军
Owner 陈俊贤
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