| 自动电位滴定技术精确测定铜矿石中高含量铜的方法研究 |
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| 引用本文： | 赵怀颖,吕庆斌,巩爱华,孙红宾,马新荣.自动电位滴定技术精确测定铜矿石中高含量铜的方法研究[J].岩矿测试,2015,34(6):672-677. |
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| 作者姓名： | 赵怀颖 吕庆斌 巩爱华 孙红宾 马新荣 |
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| 作者单位： | 国家地质实验测试中心, 北京 100037,北京市计量检测科学研究院, 北京 100029,国家地质实验测试中心, 北京 100037,国家地质实验测试中心, 北京 100037,国家地质实验测试中心, 北京 100037 |
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| 基金项目： | 中国地质大调查项目(12120113014300) |
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| 摘 要： | 铜矿石中百分含量铜的分析通常采用手动目视滴定法,该方法借助化学指示剂判定终点,存在终点判断和人为操作等误差,精密度、可靠性相对较差。基于此,本文建立了精确测定铜矿石中高含量铜的分析方法,采用智能型自动电位滴定仪自动判定终点,高分辨加液器精确控制硫代硫酸钠标准溶液加入量至0.001 m L,并且通过加大碘化钾用量使得滴定中产生的碘化亚铜被高浓度的I-溶解,消除对碘的吸附影响。本法应用于铜含量为24.2%~59.09%的铜精矿、黄铜矿、铅黄铜国家标准物质分析,相对标准偏差(RSD,n=10)0.3%,极差仅为0.13%、0.21%、0.29%,优于手动目视滴定法。本法提高了铜矿石分析的自动化程度,适用于精确测定铜含量大于0.5%尤其是10%以上的铜矿石。
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| 关 键 词： | 铜矿石 铜 硫代硫酸钠标准溶液 自动电位滴定法 |
| 收稿时间： | 2014/6/13 0:00:00 |
| 修稿时间： | 9/8/2015 12:00:00 AM |
Accurate Measurement of High Copper in Copper Ores with Automatic Potentiometric Titration Technique |
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| Institution: | National Research Center for Geoanalysis, Beijing 100037, China,Beijing Institute of Metrology and Testing, Beijing 100029, China,National Research Center for Geoanalysis, Beijing 100037, China,National Research Center for Geoanalysis, Beijing 100037, China and National Research Center for Geoanalysis, Beijing 100037, China |
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| Abstract: | Copper in copper ores is commonly determined by a manual visual titration method. The method has large errors, poor precision and poor reliability due to the need to gauge the end of the chemical reaction by a chemical indicator. Based on these disadvantages, a high precision determination method for high Cu content in Cu ores has been developed. In this new method, the terminal point is determined by intelligent potentiometric titrator automatically and the amount of sodium thiosulfate standard solution is accurate to 0.001 mL by a high-resolution dosing device. Moreover, the amount of potassium iodide is increased to eliminate the absorption of iodine with copper iodide which was produced during titration, as the copper iodide can be dissolved by high concentrations of iodide. National standard materials such as copper concentrate,chalcopyrite and lead brass with copper content ranging from 24.2% to 59.09% are determined using this method. The relative standard deviation is lower than 0.3%(n=10). The extreme differences are 0.13%, 0.21% and 0.29%, better than manual visual titration. The proposed method improves the automation for accurate determination of ores with Cu content greater than 0.5%, especially for those with Cu content more than 10%. |
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| Keywords: | copper ore copper sodium thiosulfate automatic potentiometric titration |
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