火试金法测定锌精矿的金银含量

Fire Assay Determination of Gold and Silver Content in Zinc Concentrate

本研究采用火试金法富集锌精矿中的贵金属,通过熔炼、灰吹、称重得到合粒的质量,然后用电感耦合等离子体发射光谱(ICP-OES)法测定硝酸分金液的杂质含量,退火称重得到金质量。合粒质量减去金质量和杂质质量,即可得到银质量。该方法金加标回收率为98.1%~100.5%,银加标回收率为98.2%~99.2%。金的相对标准偏差为1.45%~1.98%,银的相对标准偏差为0.50%~0.83%。

In this study,the fire assay method is used to enrich the precious metals in the zinc concentrate,and the combined pellet quality is obtained through smelting,ash blowing and weighing,then inductively coupled plasma-optical emission spectroscopy(ICP-OES)method is used to determine the impurity content of the nitric acid gold separation solution,and the gold quality is obtained by annealing and weighing.The quality of silver can be obtained by subtracting the quality of gold and impurities from the quality of the aggregated grains.The gold standard recovery rate of this method is 98.1%~100.5%,and the silver standard recovery rate is 98.2%~99.2%.The relative standard deviation of gold is 1.45%~1.98%,and the relative standard deviation of silver is 0.50%~0.83%.