不同介质中锌还原氯化银的研究

Researches on the Reduction of Silver Chloride by Zine in Different Media

本文研究了在不同介质中锌还原氯化银制取金属银的影响。结果表明金属锌还原氯化银的最佳硫酸浓度为0.05～0.5mol/L,在此浓度范围内具有较快的反应速度,银的产率达99％。在氯化钠溶液中锌能较好地还原氯化银,在硝酸钠溶液中锌不能还原氯化银。提出了应该在百分之一的氯化钠溶液中用锌还原氯化银制取金属银的结论。

In this paper, reduction of silver chloride by zine in different media is desoribed. Experimental results show that the most favorable concentration of sulphuric acid is between 0.05～0.5mol/L. Within this range, the rate of reaction is fast, the yield of silver reaches 99%. Zine reduce silver chloride fairly in the solotion of sodium nitrate(1% and 5%), but not in the solution of sodium chloride(1% and 5%). It is concluded that it is necessary to reduce silver chioride by zine in the solution of sodium chloride(1%).