Abstract: Separation of Cr3+ and Fe3+ from in sulfuric acid leaching solution of chromite with goethite was studied with experiments. The result show that Fe(OH)3 produced by adding appropriate amount of mineralizing agent (KOH) into Fe2(SO4)3 solution can be transformed into goethite inoculating crystals in good crystalline form under the conditions of 8 h heating at 120℃. After diluting the sulfuric acid leaching solution of chromite to the concentration of Fe3+ at 1 g/L and then adding goethite inoculating crystals to the solution, the separation between Fe3+ and Cr3+ can be accomplished under the conditions of pH 2.5 and 90℃ heating for 4 h. 97% of iron is precipitated and 33% of chromium lost.

Key words: chromite, sulfuric acid leaching, goethite, Cr3+, Fe3+, separation

摘要： 采用针铁矿法分离铬铁矿硫酸浸出溶液中的Cr3+与Fe3+. 结果表明，以Fe2(SO4)3溶液中加入适量KOH后生成的Fe(OH)3为前驱体，在120℃的水热条件下保温8 h后可制备出晶体发育良好的针铁矿晶种. 将铬铁矿硫酸浸出液的Fe3+浓度稀释至1 g/L以下并加入针铁矿晶种，在pH=2.5、温度90℃条件下保温4 h后，Fe3+以针铁矿晶体沉淀析出，能实现铁与铬的分离，除铁率为97%，铬损失率为33%.

关键词: 铬铁矿, 硫酸浸出, 针铁矿, Cr3+, Fe3+, 分离