The invention discloses a method for harmless disposal and recycling of aluminum ash. The method comprises steps of
raw material water immersion nitrogen and
chlorine removal,
calcination fluorine removal, alkali fusion
sintering,
sintering material dissolving-out and purifying
impurity removal. Aluminum ash generated in
metal aluminum
smelting process is employed as a
raw material, after
metal aluminum is recycled through secondary
processing, nitrides are removed through
water immersion, fluorides are removed through calcinations, alkali fusion
sintering is carried out, the sintering materials are dissolved out, impurities are removed through a
sodium aluminate solution, the processed aluminum ash is employed as a
raw material for producing sand-shaped aluminum
oxide.
Ammonia gas generated in the aluminum ash harmless disposal process can be employed as an
ammonium production raw material, a chlorination liquid generated can be employed as a
chlorate production raw material, and
silicon fluoride gas generated in the
calcination process is absorbed by an
aqueous solution. The method is simple and practical,
environmental protection benefits are high, the production efficiency is high, the device investment is low, and
energy consumption is low. Harmless and recycling disposal of hazardous wastes can be achieved. The obtained product can be applied in practical production.