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中国无机分析化学:2019,9(4):31-35
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铜精矿中铜的电解重量法测定及其与碘量法测定的比较
颜立新, 刘金优, 杨琛, 冯晓青, 程堆强
(通标标准技术服务有限公司)
Determination of Copper Content in Copper Concentrates by Electrogravimetric Method and Its Comparison with Iodometric Method
YAN Lixin, LIU Jinyou, YANG Chen, FENG Xiaoqing, CHENG Duiqiang
(SGS-CSTC Standards Technical Services Co.,Ltd.)
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投稿时间:2019-03-08    修订日期:2019-06-11
中文摘要: 本文采用电解重量法,以硝酸、硫酸消解试样,加入氢溴酸除去杂质元素,氨水分离过滤,含铜滤液进行电解称重,并辅以电感耦合等离子体原子发射光谱仪测定残渣、残液中的回收铜,得到铜精矿中的铜含量。通过标准样品准确度实验,可知电解重量法测定铜精矿铜含量准确可靠,并抽取10个铜精矿检测样与经典碘量法对比,绝对偏差均在±0.15%以内,测定结果吻合。通过精密度比较发现,电解重量法所得标样GBW07166和检测样Cu-10相对标准偏差分别为0.20%、0.19%,均较碘量法0.34%、0.28%小,具有更高的精密度。因此,推广电解重量法测定铜精矿中铜含量很有必要。
中文关键词: 铜精矿  电解重量法  铜含量  碘量法
Abstract:In this paper, the copper content in copper concentrates is determined by electrogravimetric method. The sample is digested with nitric acid and sulfuric acid. Impurity elements are removed by adding hydrobromic acid. The solution is added with excess ammonia and filtered. The copper-containing filtrate is then electrolyzed and deposited copper weighted. The trace of copper in the residue and residual liquid is determined by inductively coupled plasma atomic emission spectrometry. From the experiment of accuracy, it can be concluded that electrogravimetric method is accurate and reliable. The results of 10 copper concentrate samples are in consistent with those by iodometric method, with deviations all less than 0.15%. In the precision experiment, the RSD results by electrogravimetric method of sample GBW07166 and Cu-10 are 0.20%, 0.19%, respectively, less than 0.34%, 0.28% by iodometric method,indicating a higher precision of electrogravimetric method. Therefore, it is necessary to promote the electrogravimetric method to determine the copper content in copper concentrates area.
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颜立新,刘金优,杨琛,冯晓青,程堆强.铜精矿中铜的电解重量法测定及其与碘量法测定的比较[J].中国无机分析化学,2019,9(4):31-35.
YAN Lixin,LIU Jinyou,YANG Chen,FENG Xiaoqing,CHENG Duiqiang.Determination of Copper Content in Copper Concentrates by Electrogravimetric Method and Its Comparison with Iodometric Method[J].Chinese Journal of Inorganic Analytical Chemistry,2019,9(4):31-35.

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