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| Determination of Iron in Sodium Jarosite |
| Received:November 13, 2015 Revised:February 22, 2016 |
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| DOI：doi:10.3969/j.issn.2095-1035.2016.02.019 |
| KeyWord:sodium jarosite; potassium dichromate; iron; titanium trichloride; sodium hydroxide solution; inductively coupled plasma-atomic emission spectrum |
| Author | Institution |
| WANG Yunguang |
成都理工大学 地球科学学院， 成都 |
| WANG Tong |
成都理工大学 材料与化工工程学院，成都 |
| TANG Gengfei |
广西大锰锰业有限公司，南宁 |
| FENG Fangbing |
成都理工大学 地球科学学院， 成都 |
| XU Jinyong |
成都理工大学 地球科学学院， 成都 |
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| Abstract: |
| Rapid and accurate determination of iron content is conducive to control iron hydrometallurgical processes. In this paper, the sodium jarosite sample was decomposed by sodium hydroxide solution, and the residue was dissolved in a 10 % hydrochloric acid medium. Excess acid was removed by evaporation. Ammonia was used to separate copper, nickel, cobalt and other elements from precipitation of?iron hydroxide, and then the precipitation was dissolved in hydrochloric acid. In hydrochloric acid medium, a large amount of Fe (III) is reduced to Fe (II) by SnCl2. Choosing sodium tungstate as an indicator, the solution titanium trichloride was added until the solution turned blue. Then, the potassium dichromate solution was added to oxidize the excess of titanium (III) until the solution became colorless. Total iron contents were determined by titration with potassium dichromate standard solution by using diphenylamine sulfonate as an indicator. The results showed that most of coexisting elements in the sodium jarosite were separated. The values determined by this method were consistent with those by inductively coupled plasma-atomic emission spectrum. The relative standard deviation (RSD, n=9) was less than 0.1%. |
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