Ammonia leaching zinc oxide zinc electrowinning

The present invention discloses a preparation of ammonia leaching zinc oxide zinc electrowinning method, belonging to hydrometallurgy. Ammonia leaching of zinc oxide of the present invention is made to take zinc electrowinning, including ammonia leaching, purification, flash, acid hydrolysis, electrowinning, the specific procedure: immersion solution containing the ammonium zinc oxide, after a period of time, filtered, the filtrate to give net the resulting filtrate was purified to give ammonia leaching solution obtained was subjected to flash ammonia leaching net deamination resulting flashed recovered gaseous ammonia was added to the slurry after flashing concentrated sulfuric acid and / or sulfur trioxide (of SO3) gas , acidolysis, ZnSO4 solution obtained, while the fluoro, chloro volatiles removed after electrowinning ZnSO4 resulting solution was cooled to obtain a zinc electrowinning. Ammonia leaching of zinc oxide of the present invention is made to take a zinc electrowinning with conventional ammonia oxidation to take zincate zinc electrowinning process increases the recovery of ammonia and the acid flash process free of fluorine, chlorine, avoiding fluoro, chloro equipment and adversely affect the electrowinning process, the higher the quality of the resulting zinc electrowinning, cathode zinc resultant sheet structure denser.