Method for purifying and separating carbon and fluoride from waste carbon material in aluminum electrolysis tank and prolonging service life of equipment

A technology of aluminum electrolytic cell waste and fluoride, which is applied in the fields of alkali metal fluoride, chemical instruments and methods, aluminum fluoride, etc., can solve problems such as low purity, low resource utilization rate products, and short service life of equipment, and achieve Avoid the volatilization of impurities, improve the utilization efficiency and prolong the service life

Inactive Publication Date: 2018-09-21
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems of low resource utilization rate and / or low product purity and / or short service life of equipment in the existing pyrotechnics for recycling resources from waste cathode carbon blocks, the present invention provides a purification and separation aluminum electrolytic cell The method of prolonging the service life of equipment at the same time by carbon and fluoride in waste carbonaceous materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Step (1): Grinding:

[0039] Use a ball mill to grind the waste cathode carbon blocks to a particle size of 100 mesh, of which -100 mesh accounts for 90%.

[0040] Step (2): Drying:

[0041] Drying the cathode carbon powder obtained by grinding step (1) at 100° C. to reduce the moisture content to 0.3%;

[0042] Step (3): pre-baking:

[0043] Under a protective atmosphere, the cathode carbon powder obtained after drying in step (2) was pre-calcined at 900° C. for 80 minutes;

[0044] Step (4): Roasting:

[0045] Under a protective atmosphere, the product obtained after pre-calcination in step (3) was calcined at 1700 ° C for 50 minutes, and the calcined carbon powder A and fluoride were separated to obtain;

[0046] Step (5): high temperature treatment:

[0047] Under a protective atmosphere, the calcined carbon powder A obtained after the step (4) is roasted is subjected to a high temperature treatment at 2800° C. for 20 minutes to separate and obtain graphitized ...

Embodiment 2

[0114] Step (1): Grinding:

[0115] Use a ball mill to grind the waste cathode carbon blocks to a particle size of 100 mesh, of which -100 mesh accounts for 80%.

[0116] Step (2): Drying:

[0117] Drying the cathode carbon powder obtained by grinding step (1) at 110° C. to reduce the moisture content to 0.5%;

[0118] Step (3): pre-baking:

[0119] Under a protective atmosphere, the cathode carbon powder obtained after drying in step (2) was pre-calcined at 1000° C. for 60 min;

[0120] Step (4): Roasting:

[0121] Under a protective atmosphere, the product obtained after pre-calcination in step (3) was calcined at 1600° C. for 70 minutes to separate and obtain calcined carbon powder A and fluoride;

[0122] Step (5): high temperature treatment:

[0123] Under a protective atmosphere, the calcined carbon powder A obtained after the step (4) is roasted is subjected to a high temperature treatment at 2600° C. for 30 minutes, and the graphitized carbon powder B and ash are ...

Embodiment 3

[0126] Step (1): Grinding:

[0127] Use a ball mill to grind the waste cathode carbon blocks to a particle size of 100 mesh, of which -100 mesh accounts for 85%.

[0128] Step (2): Drying:

[0129] Drying the cathode carbon powder obtained by grinding in step (1) at 130°C to reduce the moisture content to 0.4%;

[0130] Step (3): pre-baking:

[0131] Under a protective atmosphere, the cathode carbon powder obtained after drying in step (2) was pre-calcined at 800° C. for 100 min;

[0132] Step (4): Roasting:

[0133] Under a protective atmosphere, the product obtained after pre-calcination in step (3) was calcined at 1500° C. for 90 minutes to separate and obtain calcined carbon powder A and fluoride;

[0134] Step (5): high temperature treatment:

[0135] Under a protective atmosphere, the roasted carbon powder A obtained after step (4) is roasted under the condition of 2400 ° C, high-temperature treatment for 40 minutes, and the graphitized carbon powder B and ash are sep...

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PUM

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Abstract

The invention discloses a method for purifying and separating carbon and fluoride from a waste carbon material in an aluminum electrolysis tank and prolonging the service life of equipment. The methodcomprises the following steps: crushing and pulverizing the waste carbon material in the aluminum electrolysis tank till particles of 100 meshes accounts for 50 percent or above; then drying the waste carbon material to reduce the moisture content to 0.1 to 0.8 percent; pre-roasting the dried carbon powder at 700 to 1,200 DEG C for 30 to 150 min; roasting a product obtained by pre-roasting at 1,400 to 1,800 DEG C for 20 to 120 min, and separating the product to obtain a roasted carbon powder A and electrolyte; treating the roasted carbon powder A at the high temperature of 2,200 to 3,000 DEGC for 1 to 60 min, and separating the product to obtain graphitized carbon powder B and ash. According to the method for purifying and separating carbon and fluoride from the waste carbon material inthe aluminum electrolysis tank and prolonging the service life of the equipment, the problems of severe corrosion to the equipment due to the high impurity content of the collected volatilized fluoride during high-temperature graphitization of the waste carbon material in the aluminum electrolysis tank are solved, so that improvement on the purity of a carbon material is implemented.

Description

technical field [0001] The invention belongs to the field of charcoal waste recycling, and in particular relates to a method for purifying and separating charcoal and fluoride in waste carbonaceous materials of an aluminum electrolytic cell while prolonging the service life of the equipment. Background technique [0002] A large amount of waste carbonaceous materials will be produced in the production process of electrolytic aluminum. Among them, due to the erosion of electrolyte, about 10kg of waste cathode carbon blocks will be produced for every ton of electrolytic aluminum produced, which has become the main solid in the aluminum electrolysis industry. pollutants. Taking 2017 as an example, the output of electrolytic aluminum in my country has reached 32.25 million tons, and more than 300,000 tons of waste cathode carbon blocks have been produced, which is huge and cannot be ignored. [0003] In waste cathode carbon blocks, the main components are carbon, cryolite, sodi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/205C25C3/18C01F7/50C01D3/02
CPCC01B32/205C01D3/02C01F7/50C01P2006/80C25C3/18
Inventor 赖延清田忠良杨凯辛鑫李劼
Owner CENT SOUTH UNIV
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