氯氧铋湿法还原制备海绵铋的研究

研究了氯氧铋湿法还原制备海绵铋的方法。将氯氧铋置于盐酸溶液中搅拌溶解,溶解过程中加入铁粉还原铋离子,最后得到铋含量80%左右的海绵铋。研究了盐酸浓度、液固比、铁粉加入前反应时间、铁粉用量、铁粉加入后反应时间、反应温度对铋还原效果的影响,得出反应最佳条件为:盐酸浓度2.5 mol/L、液固比5∶1、铁粉加入前反应时间0.5 h、铁粉用量为理论量1.25倍、铁粉加入后反应时间3 h、反应温度常温,此时海绵铋中铋含量为84.93%。

Preparation of Sponge Bismuth with Bismuth Oxychloride by Wet Reduction Technique

The method for preparing sponge bismuth with bismuth oxychloride by wet reduction technique was studied and presented. Bismuth oxychloride was firstly put into HCl solution and stirred for dissolution, and iron powder was then added during the process of dissolution to reduce bismuth ion. A sponge bismuth with bismuth content around 80% was finally obtained. In the study, effects of HCl concentration, liquid-solid ratio, reaction time before and after the addition of iron powder, dosage of iron powder and reaction temperature on the reduction of bismuth were investigated. It is found that reaction with the following optimum conditions, including HCl concentration of 2.5 mol/L, liquid-solid ratio of 5∶1, 0.5 h-reaction and 3 h-reaction respectively before and after the addition of iron powder, the dosage of iron powder at 1.25 times the theoretical amount, reaction at an ambient temperature, produced the sponge bismuth with bismuth content at 84.93%.