(1. 昆明理工大学 材料与冶金工程学院,昆明650093;
2. 云南冶金集团总公司 技术中心,昆明650031)
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。
关键字: 铬;硫酸铬(III);浸出率;还原
magnesium chromite
(1. Faculty of Materials and Metallurgical Engineering,
Kunming University of Science and Technology, Kunming 650093, China;
2. The Technique Center of Yunnan Metallurgy Co. Ltd., Kunming 650031, China)
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.
Key words: chromium; chromium sulfate; leaching ratio; reduction