The preparation of sulfate heptahydrate and copper sulfate pentahydrate from calcined zincblende was investigated.

用经高温煅烧后的闪锌矿石与稀硫酸反应制备七水硫酸锌和五水硫酸铜.

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Modified polymerized sulphate flocculating agent was made with ferrous sulphate heptahydrate, sulphate acid, natrium chlorate etc.

以七水硫酸亚铁 、 硫酸 、 氯酸钠等原料,制备了改性聚合硫酸铁絮凝剂.

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