METHOD FOR PRODUCING HIGH-PURITY NANOMETER ZINC OXIDE FROM ELECTROLYTIC ZINC ACID-LEACHING RESIDUES BY AMMONIA DECARBURIZATION

摘要

Disclosed is a method for producing a high-purity nanometer zinc oxide from electrolytic zinc acid-leaching residues by ammonia decarburization. The method comprises: adding 0.3-0.5kg of sodium fluorosilicate to per cubic meter of ammonia water-ammonium bicarbonate solution when leaching, and then adding 30-60kg of slaked lime to per cubic meter of a leaching agent for performing decarburization and refining treatment. The obtained nanometer zinc oxide powder has purity of 99.7% or more, uniform particle size distribution (average particle size of 10-30nm), specific surface area of 105 m2/g or more, good fluidity and good dispersity. The treatment method is characterized by low energy consumption and high efficiency; all valuable and harmful heavy metals in the electrolytic zinc acid-leaching residues are leached out to be reasonably utilized and cleaned with water, so that the obtained final leaching residues are converted from electrolytic zinc acid-leaching residues as high hazard wastes into ordinary solid wastes.