火试金-重量法测定冰铜中的金和银

Fire Assay-Gravimetric Determination of Gold and Silver in Matte

冰铜(也叫铜锍)是铜精矿冶炼制铜过程中的重要产物,其成分以硫化铁硫化亚铜聚合物(FeS.Cu:S)为主,并含有不同含量的金、银。如今,火试金重量法作为分析矿石中金和银等贵金属含量的重要方法之一,其具有准确性高、稳定性好的优点。冰铜与适量的溶剂经高温熔融得到富集金和银的铅扣,铅扣经灰吹得到金、银合粒,合粒经硝酸溶解,用重量法称量金的含量,用电感耦合等离子体发射光谱(ICP-OES)法测量硝酸银溶液中的杂质量(铅、铋、铂、钯等)和金量,合粒质量减去金总量及杂质总量即为银的含量。此方法准确度高,精密度好。金、银的加标回收率保持在98.7%~100.4%,其可以准确地测量冰铜中金、银含量。

Copper matte(also called copper matte)is an important product in the process of smelting copper from copper concentrates,its composition is mainly iron sulfide-cuprous sulfide polymer(FeS.Cu:S),and contains different contents of gold and silver.Nowadays,the fire test weight method is one of the important methods for analyzing the content of precious metals such as gold and silver in ore,which has the advantages of high accuracy and good stability.The copper matte and an appropriate amount of solvent are melted at a high temperature to obtain a lead button enriched in gold and silver,the lead button is blown to obtain gold and silver particles,the pellets are dissolved in nitric acid,the gold content is weighed by gravimetric method,and the amount of impurities(lead,bismuth,platinum,palladium,etc.)and gold in the silver nitrate solution are measured by inductively coupled plasma atomic emission spectroscopy(ICP-OES),the aggregate mass minus the total amount of gold and total impurities is the silver content,and this method has high accuracy and good precision.The standard recovery rate of gold and silver is maintained at 98.7%~100.4%,which can accurately measure the gold and silver content in matte.