云南澜沧县银锰矿中银的化学物相分析探讨

Discussion on the chemical phase analysis method of silver in Lancang silver-manganese ore,Yunnan Province

银的化学物相分析主要是分析银在各载体矿物中的含量。以往银的化学物相分析研究主要集中在铅锌矿,银锰矿中银的化学物相分析报道很少。实验通过对云南澜沧县银锰矿中锰的化学物相分析后,确定了该矿中银主要分为碳酸锰中银、与锰结合银、自然银、硫化银、铁氧化物中银和硅酸盐中银6相。选取醋酸溶液浸取碳酸锰中银,亚硫酸溶液浸取与锰结合银,硝酸铁溶液浸取金属银,硫脲-硫酸溶液浸取硫化银,硝酸浸取硫化物中的银,最后残渣测定硅酸盐中的银。通过对该矿进行6次分析,得到其各相态中银的含量,分析结果稳定,各相态银的相对标准偏差(RSD)均小于10%,满足物相分析的误差要求,且各相态银加和等于总银,说明分相正确。

The chemical phase analysis of silver is mainly to analyze the content of silver in various carrier minerals.The previous studies on the chemical phase analysis of silver were mainly focused on lead-zinc ores,while there were few reports on the chemical phase analysis of silver in silver-manganese ore.The chemical phases of silver in Lancang silver-manganese ore of Yunnan Province were analyzed.It was found that the silver in this ore mainly contained six phases,including the silver in manganese carbonate,the silver combined with manganese,the native silver,the silver sulfide,the silver in iron oxides and the silver in silicates.The silver in manganese carbonate was leached with acetic acid solution.The silver combined with manganese was leached with sulfurous acid solution.The metallic silver was leached with ferric nitrate solution.The silver sulfide was leached with thiourea-sulfuric acid solution.The silver in sulfide was leached with nitric acid solution.Finally,the silver in silicates was determined in residue.This ore was determined for 6 times.The content of silver in each phase was obtained.The analytical results were stable and the relative standard deviations(RSDs)were all less than 10%,which could meet the error requirements of phase analysis.Moreover,the sum of silver content in each phase was equal to the total silver,indicating that the analysis of each phase was correct.