水合肼还原-重量法测定氯化浸金液中金含量

Determination of gold content in chlorinated gold leaching solution by hydrazine hydrate reduction-gravimetric method

采用水合肼还原氯化浸金液(氯金酸溶液)中的金,称量析出海绵金的质量,实现了海绵金的准确测定,考查了反应温度、试液金浓度、水合肼使用量等对于测定结果的影响,并与其它测定方法进行了比对。调整氯化浸金液金浓度约为40 g/L,加入水合肼(用量1.5 mL/g-Au)还原后加热溶液微沸20 min,损失在滤液中的金量可忽略。测定结果的相对标准偏差(RSD)小于0.2%。方法操作简便,可满足生产分析的要求。

By using hydrazine hydrate to reduce the gold in chlorinated gold leaching solution(chloro-gold acid solution)and weighing the mass of the precipitated sponge gold,the accurate determination of sponge gold was realized.The effects of reaction temperature,the concentration of gold in the test solution and the amount of hydrazine hydrate on the determination results were investigated and compared with other determination methods.Adjust the gold concentration of chlorinated gold leaching solution to about 40g/L,add hydrazine hydrate(dosage:1.5 mL/g-Au)and heat the solution after reduction for 20 min,and the gold loss in the filtrate can be ignored.The relative standard deviation(RSD)of the results was less than 0.2%.The method is simple to operate and can meet the requirements of production analysis.