The invention provides a harmless and comprehensive utilization method of secondary aluminum
dross and relates to a harmless and comprehensive utilization method of secondary aluminum
dross produced in an aluminum
dross treating process. The harmless and comprehensive utilization method is characterized in that
slurry is prepared from the secondary aluminum dross produced in the aluminum dross treating process and water, a stirring
deamination reaction is performed, and
ammonia gas formed through the reaction is condensed or absorbed by water;
slurry after the reaction is subjected to liquid-
solid separation, separated
liquid phase is subjected to evaporative
crystallization, and a
chlorate and
fluoride salt mixture is obtained; separated
solid phase is used for producing a
calcium aluminate material. With adoption of the method, the aluminum dross can be treated harmlessly, useful components in the aluminum dross are recovered efficiently, the harmless secondary aluminum dross can replace high-
alumina bauxite for preparing a
calcium aluminate product, production cost is reduced greatly, zero-release utilization of the aluminum dross is realized, the process is simple, the operation is convenient, the cost is low,
environmental protection is realized, and the method has wide applicability.