[China Aluminum Industry Network] 1 lack of cyanide and hydroxide; 2 There are insufficient impurities or additives in the solution; 3 excessive accumulation of carbonate; 4 light electrolyte used too long. Approach: 1 Supplementary cyanide and hydroxide; 2 add additives; 3 Add crucible crucible or reduce the temperature to crystallize the carbonate, then filter the electrolyte to remove; 4 If the light emitting electrolyte is used for too long, it is recommended to replace the light emitting electrolyte.