碘量法测定银精矿中的铜

Determination of copper in silver concentrate by iodometry

银精矿样品除了含有银、铅、硫等主成分外,还伴生多种可以回收利用的金属元素。实验将样品采用10ml盐酸和10ml氢溴酸低温蒸干处理两次,消除了砷锑等元素对铜测定的干扰,硝硫混酸溶解样品,加热冒烟近干,盐酸溶解,吹水,饱和乙酸铵溶液调节酸度,氟化氢铵掩蔽铁,建立碘量法测定银精矿中铜的分析方法。铜测定的条件:乙酸铵饱和溶液用量、氟化氢铵饱和溶液用量、碘化钾用量、硫氰酸钾用量对测定铜的影响,并对2%~16%之间的银精矿样品进行了多次测定,加标回收率在99.32%~100.33%之间,用于银精矿的测定,准确度高。

In addition to the silver,lead,sulfur and other main components,the silver concentrate samples are accompanied by a variety of metal elements that can be recycled.In the experiment,the samples were treated with 10ml hydrochloric acid and 10ml hydrobromic acid at low temperature to dry twice,eliminating the interference of arsenic and antimony and other elements on the determination of copper.The ammonium solution adjusts the acidity,the ammonium bifluoride masks the iron,and establishes an iodometric method for the determination of copper in silver concentrate.Copper determination conditions:the amount of ammonium acetate saturated solution,ammonium bifluoride saturated solution,potassium iodide,potassium thiocyanate used to determine copper,and the silver concentrate samples between 2%~16%were measured multiple times,The recovery rate of standard addition is between 99.32%~100.33%,which is used for the determination of silver concentrate with high accuracy.