【摘要】 采用氯气同步氧化除去镍盐溶液中铁、钴，研究了氯气氧化过程中金属离子的电位及pH值变化规律，结合热力学分析，得到氯气同步除铁、钴的适宜电位区间，同时考察了pH值、温度等因素对除杂效果的影响。结果表明，反应温度对铁、钴去除率影响不大，pH值对铁、钴去除率有较大影响。氯气一次氧化同时去除铁、钴的优化实验条件为：反应温度50℃、反应时间140 min、搅拌速率400 r/min、初始pH值1.6、最高pH值4.0～4.5、除铁段控制电位0.62～0.64 V、除钴段控制电位1.08 V,此条件下可以将混合镍盐溶液中铁、钴含量分别降至0.4 mg/L、1 mg/L以下，铁、钴去除率接近100%,达到了国内某公司实际生产要求的指标(含铁小于1 mg/L、含钴小于2 mg/L),净化过程中镍的损失约0.5%。更多还原

【Abstract】 The impurities of iron and cobalt in nickel sulfate mixture solution were removed by oxidation with chlorine, and the varying pattern for the potential of metal ions and pH value during the chlorine oxidation was investigated. Based on the thermodynamic analysis, the proper potential range for removing iron and cobalt was determined. Meanwhile, the effects of pH value, temperature among other factors on impurity removal were also investigated. Results show that the reaction temperature has little influence on the removal effect of iron and cobalt, but pH value can bring great impact. It is found that under the following optimal conditions, including reaction at 50 ℃ for 140 min, agitation at a rate of 400 r/min, pH value initially at 1.6 and maximally at 4.0-4.5, potential controlled within the range of 0.62-0.64 V for the stage of iron removal and at 1.08 V for the stage of cobalt removal, the content of iron and cobalt in the solution of nickel sulfate mixture can be reduced to less than 0.4 mg/L and 1 mg/L, respectively. It indicates that the removal rates of iron and cobalt approach 100%, meeting the requirement in the actual production of a domestic company(with iron content less than 1 mg/L and cobalt content less than 2 mg/L). Furthermore, the loss of nickel in this removal process is around 0.5%.更多还原