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| Determination of Free Copper Oxide in Mixed Copper Ores by Electrogravimetry |
| Received:December 05, 2013 Revised:December 26, 2013 |
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| DOI：doi:10.3969/j.issn.2095-1035.2014.02.009 |
| KeyWord:mixed copper ore;free copper oxide; Electrogravimetry method;copper iodimetry method |
| Author | Institution |
| LIU Jiumiao |
中国有色矿业集团有限公司 卢安夏铜业有限公司，北京 |
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| Abstract: |
| A method suitable for determination of free copper oxide in mixed copper ores was established. The sample was leached in the sulfuric acid solution (10%) containing (6 g/L) sodium sulfite for two hours, and copper oxide was selectively dissolved. The leaching solution was filtered and the filtrate was boiled and diluted with deionized water for electrodeposition. Copper in solution was electrically deposited to the platinum cathode. The content of the residual copper in spent electrolyte was determined by flame atomic absorption spectrophotometry. The copper deposited on the cathode was dissolved by nitric acid(1+1), and the content of the impurity elements which were deposited to the cathode together with the copper during the electroplate process are determined by flame atomic absorption spectrophotometry. The acid-soluble copper content in copper oxide was calculated by subtracting the content of the impurity elements on the platinum cathode from the sum of the weight difference for the platinum cathode before and after cathodic electrodeposition and the residual copper in the spent electrolyte. Compared with GB copper iodometry method, in which a titration end is determined by observation of the color change of the titration solution using naked eyes, this method has less human errors. In addition, the results measured by electrogravimetry are more stable and accurate. The results for testing Canadian Certified Reference Materials AMIS 0050 (n=12) indicate that this method is accurate and reliable. The fifteen batches of oxide copper ores were selected and tested and the results were satisfactory compared with the classical copper iodometric method. |
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