氧化铋法从硫酸锌溶液中除氯的研究

以硫酸锌溶液为研究对象, 研究了氧化铋脱除硫酸锌溶液中氯的工艺条件, 结果表明, 较佳的工艺条件为;pH值约2.0, 50 ℃, 氧化铋用量为理论计算值的1.5倍, 反应时间2 h, 此条件下除氯后溶液中Cl含量为0.28 g/L, Bi含量为0.96 mg/L。同时研究了氯氧铋转化的工艺参数条件, 较佳的工艺条件为;NaOH用量为计算值2倍当量, 初始碱浓度1 mol/L, 反应时间4 h, 常温, 在此条件下可达到转化率93.97%、余铋浓度约2.35 mg/L的较好转化效果。进行了6周期工业实验, 与模似实验结果重现性好。本工艺操作简单, 能有效降低硫酸锌溶液中氯的浓度, 且铋损失较小。

Dechlorination of Zinc Sulfate Solution by Bismuth Oxide

Processing parameters for dechlorination of zinc sulfate solution by bismuth oxide were investigated, and the results show that dechlorination can be accomplished after 2 h reaction in a pulp with pH value of 2.0 at 50 ℃ by bismuth oxide with weight 1.5 times the theoretically calculated dosage. The chlorine concentration can be reduced to 0.28 g/L with the residue bismuth concentration at 0.96 mg/L. The conversion conditions of bismuth oxychloride were also studied and optimized as follows: initial alkali concentration at 1 mol/L, twofold calculated NaOH dosage, 4 h reaction at room temperature, with which, good conversion effect can be achieved as the conversion rate amounted to93.97% with the residue bismuth concentration around 2.35 mg/L. A six-period commercial test was conducted, leading to results consistent with that from laboratory tests. This processing technique is easy to operate, with which chlorine concentration in zinc sulfate solution can be effectively reduced with less loss of bismuth.