|
| Determination of lithium in cryolite for electrolytic aluminium by Flame Atomic Absorption Spectrometry |
| Received:August 01, 2019 Revised:August 01, 2019 |
| View Full Text View/Add Comment Download reader |
| DOI：doi:10.3969/j.issn.2095-1035.2020.02.012 |
| KeyWord:electrolytic aluminum; cryolite; lithium; perchloric acid; atomic absorption spectrometry |
| Author | Institution |
| WU Yuqiang |
中铝郑州有色金属研究院有限公司 |
| SHI Lei;ZHANG Yingying |
中铝郑州有色金属研究院有限公司 |
|
| Hits: 1020 |
| Download times: 761 |
| Abstract: |
| Lithium-containing cryolite is widely used in electrolytic aluminum industry instead of lithium salt. Its quality directly affects the electrolytic efficiency of electrolytic aluminum industry, the energy consumption per ton of aluminum and the quality of electrolytic aluminum products. Controlling lithium content in cryolite is an important measure to ensure product quality and to cope with the impact of waste electrolyte regeneration on fluoride market. The content of lithium in platinum crucible was determined by flame atomic absorption spectrometry (FAAS) at 670.80 nm after adding a certain amount of perchloric acid to the platinum crucible, heating, smoking and fluoride removal at high temperature, then adding hydrochloric acid to acidify and completely dissolve the salts. The method avoids the interference of fluorine matrix, and chooses a certain amount of Al-Na matrix matching to ensure the sensitivity and accuracy of the test; the recovery rate of lithium is 102.2% through standard addition recovery experiment; the linear correlation coefficient of lithium calibration curve is more than 0.9994; the detection limit of lithium is 0.0065 ug/mL; the lithium standard of lithium-containing cryolite with different content The deviations were less than 0.01%. The results obtained by this method are in agreement with those by ICP-AES. The method is accurate, reliable, simple and easy to operate, and meets the needs of production analysis in aluminum electrolysis industry. |
| Close |