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The paper presents the main factories which determine the environment pollution at hot dip galvanization process of steel sheet and developing of recycling technologies of zinc by-product, with a view to recovering metal zinc or different sub- products, and returning them in the production cycle. By th e recycling of zinc by- products the prime material consumption is reduced and enviro nmental protection is improved. Industrial wastes generated in the hot dip galvanization pr ocess of steel sheet are: zinc ash, d...