火试金重量法与AAS湿法结合测定砂金矿中金的含量

砂金矿中二氧化硅和金的含量较高,本文用传统的火试金重量法与AAS湿法相结合来测定砂金矿中的金含量,用以得到较为精确的结果。本文用科学的配料方法,调节好熔渣的硅酸度,得到品质更好的熔渣与铅扣。再通过二次补正收集分散在熔渣中的金,之后进行三次补正收集灰皿中残留的金含量,然后用原子吸收光谱—AAS湿法测定三次补正得到的金银合粒与分金液中金的含量,从而得到更精确的结果。此方法操作简便、适用性广、精密度与准确度较高。通过加标测试此方法金的回收率在99.2%～100.3% 之间,金的相对标准偏差(RSD)在0.24%～0.6%之间。

Determination of gold in placer gold by fire assay gravimetric method combined with AAS wet method

The content of silicon dioxide and gold in placer gold is high. In this paper, the gold content in placer gold is determined by the combination of traditional fire assay gravimetric method and AAS wet method to obtain more accurate results. In this paper, by using scientific method of proportioning, the silicic acid degree of slag can be adjusted to obtain better quality slag and lead button. Then, the gold dispersed in the slag is collected by secondary correction, and then the residual gold content in the ash dish is collected for three times. Then, the gold content in the gold and silver composite particles and gold separation solution obtained by the three times of correction is determined by atomic absorption spectrometry AAS, so as to obtain more accurate results. This method is easy to operate, wide applicability, high precision and accuracy. The recovery of gold is 99.2% - 100.3%, and the relative standard deviation (RSD) of gold is between 0.24% - 0.6%.