The hydrometallurgy technics of Zinc system in the Northwestern Lead and Zinc Smelter uses the purification of reverse adding Antimony salt to get rid of the impurity in the Zinc Sulfate solution.
西北铅锌冶炼厂锌系统湿法冶炼工艺采用反向锑盐法净化除去硫酸锌溶液中的杂质。
Local officials have promised that the smelter, which produces lead and zinc, will not reopen until it meets pollution standards.
当地官方承诺，排放铅和锌的该冶炼厂在达到污染排放标准之前不会重新开工。
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