Study on technological parameters of preparation for carbon anode blending waste cathode in aluminum electrolysis
SPL(Spent pot lining)is the toxic and harmful solid waste produced in the process of aluminum electrolysis.The harmless treatment is very important for the sustainable development of aluminum electrolysis industry.In this paper,the waste cathode with par-ticle size<0.074 mm was calcined in argon at 1500℃,and the carbon content of the waste cathode was increased to 97.07%.Carbon anode was prepared by mixing waste cathode after pretreatment.When the kneading temperature was 175℃and the kneading time was 30 min,the ash content of carbon anode was 0.36%,the bulk density was 1.572 g/cm3,the resistivity was 55.07 μΩ·m,the air permea-bility was 0.52 nPm,the compressive strength was 32.0 MPa,the CO2 loss rate was 2.39%and the air loss rate was 15.14%.This study puts forward a new recycling idea for waste cathode recycling,in order to solve the problem of waste cathode storage causing harm to the environment.
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