China Nonferrous Metallurgy

At present, dechlorination of zinc oxide for dust collection mainly adopts fire method dechlorination in China, which has many disadvantages, such as large equipment investment, large cleaning workload, environmental pollution. Zinc oxide for dust collection in zinc hydrometallurgy has high chlorine content and cannot be directly reused in the wet system. Based on the above, the two wet recovery schemes of zinc oxide water washingwater washing solution zinc precipitation and zinc oxide acidic leachingacid leaching solution copper residue dechlorination were studied, and the test results of the two schemes were compared and analyzed, and the wet recovery process parameters were optimized.The results show the zinc oxide water washingwater washing solution zinc precipitation scheme has the problems of low decolorination efficiency, bad zinc precipitation effect, etc.; and zinc oxide acidic leachingacid leaching solution copper residue dechlorination scheme has the advantages of good decolorination, high zinc recovery rate and low cost, and it is proved that the process is feasible.