氯化锌浸出液纤铁矿法沉铁及除杂的研究

采用纤铁矿沉淀法净化氯化锌浸出液中的铁和其他杂质离子,考察了反应温度、pH值、Fe³⁺浓度和氯化锌溶液加料速度等因素对杂质去除效果的影响。结果表明,在反应pH值3.5,溶液Fe3+浓度5.0 g/L,纤铁矿晶种添加量0.1 g,搅拌速度300 r/min,反应温度25 ℃,氯化锌溶液加料速度7.5 mL/min、溶液总体积300 mL时,铁(Ⅲ)、铬(Ⅲ)、砷(Ⅴ)、氟去除率分别可达99.96%、99.54%、99.80%和60.38%,锌损失率仅为0.86%。

Removal of Iron and Other Impurities from Zinc Chloride Solution by Lepidocrocite Method

Iron and other impurities were removed from zinc chloride solution by precipitation with lepidocrocite method. Influences of reaction temperature, pH value, Fe³⁺ concentration, and adding speed of zinc chloride, on the removal effect were investigated. Results showed that, under the following optimal conditions, including pH value for reaction at around 3.5, Fe³⁺ concentration at 5.0 g/L, dosage of lepidocrocite seeds of 0.1 g, agitation speed at 300 r/min, reaction temperature of 25 ℃, adding speed of zinc chloride solution at 7.5 mL/min with its total volume of 300 mL, the removal rate of Fe(Ⅲ)、Cr(Ⅲ)、As(Ⅴ)、F reached 99.96%, 99.54%, 99.80% and 60.38%, respectively, and Zn loss rate was just 0.86%.