从铬精矿中制备硫酸铬(Ⅲ)的新工艺
来源期刊：中国有色金属学报2008年增刊第1期
论文作者：李荣兴 谢刚 杨大锦 林艳
文章页码：64 - 69
关键词：铬；硫酸铬(III)；浸出率；还原
Key words：chromium; chromium sulfate; leaching ratio; reduction
摘 要：介绍一种从铬精矿中制备硫酸铬的新工艺。实验确定烧结、浸出、除铝、还原和分解等工艺步骤的最佳条件，并对产品(硫酸铬(Ⅲ))的性质进行分析。结果表明，采用本工艺制备的硫酸铬(III)纯度高，铬含量达到150~ 250 g/L。其中，适宜的烧结条件为：温度1 050~1 150 ℃，时间60~90 min；适宜的浸出条件为：温度80 ℃，时间120~130 min；适宜的除铝条件为：温度80 ℃，pH 7~8，时间120~150 min。
Abstract: The overall flow-sheet of producing chromium (Ⅲ) sulfate was described. The suitable conditions of each process such as sintering, leaching, aluminum removal, reduction, and decomposition conditions were experimentally studied. The results show that it is reasonable to produce high-purity chromium (III) sulfate by the flow-sheet pointed out. The ultimate product is Cr2(SO4)3 solution containing 150-250 g/L Cr. Finally, the optimum parameters of sintering, leaching and aluminum-removal are temperature of 1 050-1 150 ℃, period of 60-90 min; temperature of 80 ℃, period of 120-130 min; and temperature of 80 ℃, pH of 7-8, period of 120-150 min, respectively.
