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
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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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