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| Determination of arsenic content in tungsten tailings by potassium dichromate volumetric method with sodium hypophosphite separation |
| Received:September 25, 2023 Revised:February 04, 2024 |
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| DOI：10.3969/j.issn.2095-1035.2024.07.004 |
| KeyWord:solid waste;sodium hypophite;potassium dichromate;tungsten tailings;arsenic |
| Author | Institution |
| LVChangKuan |
中国有色桂林矿产地质研究院有限公司 |
| LuoJianHua |
恒晟水环境治理股份有限公司 |
| TangLiFu |
中国有色桂林矿产地质研究院有限公司 |
| TangBiYu |
中国有色桂林矿产地质研究院有限公司 |
| ZengZhiPing |
中国有色桂林矿产地质研究院有限公司 |
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| Abstract: |
| Tungsten tailings produced in mineral processing are piled up for a long time,and after being washed by rain,the arsenic in tungsten tailings will enter the water and soil,causing environmental pollution.Accurate determination of the arsenic content in tungsten tailings is conducive to monitoring the degree of environmental pollution caused by arsenic in tungsten tailings.The sample was decomposed with nitrate and potassium chlorate saturated solution and ammonium fluoride solution,and then smoked with sulfuric acid solution to drive out nitric acid. In hydrochloric acid medium,with copper sulfate as catalyst,sodium hypophosphite was used to reduce arsenic ions to elemental state,and the precipitated arsenic was filtered and separated to remove other impurities.In sulfuric acid solution,the dissolved elemental arsenic was titrated with excess potassium dichromate standard solution,and the excess potassium dichromate was reversed titrated with ferrous sulfate standard solution using sodium diphenylamine sulfonate as an indicator.A method for the determination of arsenic content in tungsten tailings by sodium hypophosphite separation-potassium dichromate volumetric method was established by optimizing the conditions of sample dissolution and arsenic precipitation reduction.The effect of arsenic content in filtrate on the results of arsenic determination was investigated,and arsenic content could be ignored.The results showed that arsenic precipitated completely in the experiment.Arsenic was separated from impurity by precipitation and filtration,and the influence of impurity on arsenic determination was eliminated.The potassium dichromate volumetric method was used to determine arsenic in three tungsten tailings samples,and the standard recovery test was carried out.The relative standard deviation (RSD, n=11) of determination results were between 0.14% and 2.1%.The recoveries were between 97% and 101%.The method is simple, accurate and suitable for the determination of high arsenic content in tungsten tailings.The results were basically consistent with those of alkali-melt separation and iodimetry. |
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