A method for preparing prebaked anode using aluminum electrolysis waste cathode carbon block
A technology of waste cathode carbon blocks and prebaked anodes, which is applied in the field of reuse of waste cathode carbon blocks in aluminum electrolysis, and can solve problems such as aggravating anode slag drop, limited purification effect, and deterioration of cell conditions
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Embodiment 1
[0034] (1) The raw materials are mixed according to the mass ratio of aluminum electrolysis waste cathode carbon block: electric calcined anthracite: pitch equal to 80:5:15; among them, the particle size of electric calcined anthracite is 13-6mm, and the particle size of aluminum electrolysis waste cathode carbon block is divided into 6 ~3mm, 3~1mm, and -0.15mm are three grades, and the carbon blocks of each grade account for 25%, 25%, and 50% of the total mass of aluminum electrolysis waste cathode carbon blocks, respectively.
[0035] (2) Mix and knead the materials prepared in step (1) at 170° C., and then extrude to obtain the raw carbon block.
[0036] (3) The carbon block raw material is roasted in the carbon monoxide atmosphere according to the following heating system: room temperature ~ 300 ° C heating rate 11 ° C / h, 300 ~ 700 ° C heating rate 3 ° C / h, 700 ~ 1200 ° C heating rate 10 ° C / h , 1200-1900°C heating rate 5°C / h, heat preservation at 1900°C for 30 hours...
Embodiment 2
[0043] (1) The raw materials are mixed according to the mass ratio of aluminum electrolysis waste cathode carbon block: electric calcined anthracite: coal tar: pitch equal to 75:5:2:8; among them, the particle size of electric calcined anthracite is 13 ~ 6mm, and the aluminum electrolysis waste cathode carbon block The particle size is divided into three grades: 6-3mm, 3-1mm, and -0.15mm, and the carbon blocks of each grade account for 25%, 35%, and 40% of the total mass of aluminum electrolysis waste cathode carbon blocks respectively.
[0044] (2) Mix and knead the material prepared in step (1) at 120° C., and then mold it to obtain a raw carbon block.
[0045] (3) The carbon block raw meal is roasted in a helium atmosphere according to the following heating system: room temperature to 300 ° C heating rate 9 ° C / h, 300 ~ 700 ° C heating rate 2 ° C / h, 700 ~ 1200 ° C heating rate 9 ° C / h , 1200-1700°C heating rate 4°C / h, 1700°C heat preservation for 35 hours, 1700°C-700°...
Embodiment 3
[0052] (1) The raw materials are mixed according to the mass ratio of aluminum electrolysis waste cathode carbon block: electric calcined anthracite: phenolic resin is equal to 70:10:20; the electric calcined anthracite particle size is 13 ~ 6mm, and the aluminum electrolysis waste cathode carbon block particle size is divided into There are three grades of 6-3mm, 3-1mm, and -0.15mm, and the carbon blocks of each grade account for 30%, 15%, and 55% of the total mass of aluminum electrolysis waste cathode carbon blocks, respectively.
[0053] (2) Mix and knead the material prepared in step (1) at 30° C., and then vibrate and form it to obtain raw carbon block.
[0054] (3) The carbon block raw material is roasted in the hydrogen atmosphere according to the following heating system: room temperature to 300 ° C heating rate 7 ° C / h, 300 ~ 700 ° C heating rate 1 ° C / h, 700 ~ 1200 ° C heating rate 8 ° C / h, 1200-1500°C heating rate 4°C / h, 1500°C heat preservation for 40 hours,...
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