Method for recycling carbon from aluminum electrolytic waste cathode through ultrasonic-assisted pressure acid leaching
An aluminum electrolytic cell waste and ultrasonic technology, applied in the removal of solid waste, etc., can solve the problems of high environmental protection pressure, serious equipment corrosion, complex process, etc., and achieve the effects of accelerating the reaction speed, improving the effect of acid leaching, and shortening the reaction time
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Embodiment 1
[0036] Take 10g of waste cathode carbon blocks from an aluminum electrolytic cell in a domestic factory, and the measured main element contents are (wt%): C 65.46, Al9.47, O 6.39, F 7.51, Na 6.28.
[0037] step one
[0038] Crushing the waste cathode carbon blocks of the aluminum electrolytic cell to obtain spare powder, the particle size of which is less than 200 mesh;
[0039] step two
[0040] The spare powder obtained in step 1 and water are formulated into a slurry according to the liquid-solid ratio of 2:1, and the slurry is treated in an ultrasonic wave for 15 minutes, with an ultrasonic frequency of 40KHz and a power of 200W;
[0041] step three
[0042] Add H to the ultrasonic pretreatment powder according to the liquid-solid ratio of 8:1 2 SO 4 In the lye with a concentration of 2mol / L, the acid leaching process was carried out in an autoclave under pressure, with a constant temperature of 180°C, a stirring speed of 600rpm, and a reaction time of 45min. After fil...
Embodiment 2
[0067] Take 20g of waste cathode carbon blocks from an aluminum electrolytic cell in a domestic factory, and the measured main element contents are (wt%): C 65.46, Al9.47, O 6.39, F 7.51, Na 6.28.
[0068] step one
[0069] Crushing the waste cathode carbon blocks of the aluminum electrolytic cell to obtain spare powder, the particle size of which is less than 200 mesh;
[0070] step two
[0071] The standby powder obtained in step 1 and water are formulated into a slurry according to the liquid-solid ratio of 2:1, and the slurry is treated in an ultrasonic wave for 20 minutes, with an ultrasonic frequency of 40KHz and a power of 200W;
[0072] step three
[0073] Add H to the ultrasonic pretreatment powder according to the liquid-solid ratio of 10:1 2 SO 4 In the lye with a concentration of 3mol / L, the acid leaching process was carried out under pressure in an autoclave, with a constant temperature of 180°C, a stirring speed of 800rpm, and a reaction time of 90min. After ...
Embodiment 3
[0078] Take 30g of waste cathode carbon blocks from an aluminum electrolytic cell in a domestic factory, and the measured content of main elements is (wt%): C 65.46, Al9.47, O 6.39, F 7.51, Na 6.28.
[0079] step one
[0080] Crushing the waste cathode carbon blocks of the aluminum electrolytic cell to obtain spare powder, the particle size of which is less than 200 mesh;
[0081] step two
[0082] The spare powder obtained in step 1 and water are formulated into a slurry according to the liquid-solid ratio of 1:1, and the slurry is treated in an ultrasonic wave for 15 minutes, with an ultrasonic frequency of 25KHz and a power of 200W;
[0083] step three
[0084] Add H to the ultrasonic pretreatment powder according to the liquid-solid ratio of 5:1 2 SO 4 In the lye with a concentration of 1mol / L, the acid leaching process was carried out under pressure in an autoclave, with a constant temperature of 100°C, a stirring speed of 800rpm, and a reaction time of 180min. After ...
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