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| Efficient Recovery of Potassium and Sodium from Dust of Rotary Hearth Furnace |
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Received:May 10, 2024
Revised:June 07, 2024
Accepted:June 11, 2024
Published Online:August 08, 2024
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| DOI：doi：10.3969/j.issn.1007-7545.2024.08.014 |
| KeyWord:dust of rotary hearth furnace; potassium; sodium; water leaching; fluorine; thallium |
| Author | Institution |
| FAN Yanqing |
矿冶科技集团有限公司 |
| LIU Wei |
矿冶科技集团有限公司 |
| PENG Cheng |
宝武集团环境资源科技有限公司 |
| LIU Changzheng |
宝武集团环境资源科技有限公司 |
| WANG Ling |
北京科技大学 |
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| Abstract: |
| Aiming at the dust of rotary hearth furnace, a high efficient recovery process of potassium and sodium by heating and water leaching was proposed. The effects of various factors on the recovery of potassium and sodium during water leaching were investigated, and the leaching conditions of harmful elements fluoride and thallium were analyzed. The results show that under the conditions of water leaching temperature of 80 ℃, liquid-solid ratio of 6, time of one hour and stirring speed of 500 r/min, the leaching rate of potassium and sodium is both above 99%, and the leaching rate of zinc, fluorine and thallium is 10.03%, 18.35% and 81.89%, respectively. The optimal conditions for zinc deposition from water leaching solution are as follows: the temperature is 40 ℃, the time is 60 min, the stirring speed is 350 r/min, the dosage of Na2CO3 is 12 g/L, and the pH value of the solution is 8.37. At this condition, the zinc content in the purification solution is 0.3 mg/L with the zinc removal rate of 99.99%, and the contents of impurity calcium and magnesium are 5.72 mg/L and 1.3 mg/L, respectively. The purified solution was evaporated and crystallized to prepare potassium chloride, and the product meets the national standard (GB 6549—2011) for industrial potassium chloride superior product standard. |
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