A method for treating aluminum electrolytic waste
cathode carbon blocks by an acid and alkali
combination method is characterized by comprising the following steps: (1) aluminum electrolytic waste
cathode is added to concentrated basic solution for reaction; a filtered
solid phase is obtained by filtering and is added to concentrated acid for reaction; and carbon
powder is obtained after
filtration; (2) filtrates are mixed and dropwise added with the concentrated basic solution, the pH value thereof is adjusted to 9, the obtained mixture is kept standing and filtered to obtain
cryolite; (3) the filtrate is added with saturated
bleach solution, kept standing and filtered to obtain
calcium fluoride; (4) the fourth filtrates is heated, evaporated and crystallized to obtain
sodium chloride solid. With the purposes of waste utilization and
environmental protection, the method successfully provides the process for treating aluminum electrolytic waste
cathode by the acid and alkali method, which causes the waste cathode to not be the conventional waste and
pollutant and to become artificial mineral resources. The method solves the problem of waste utilization in
aluminum electrolysis industry, improves benefit, and improves the comprehensive level of the
aluminum electrolysis industry of China.