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| Removal of Iron(Ⅱ) from NdFeB Waste Hydrochloric Acid Priority Solution by NaClO3 Oxidation-NaOH Precipitation Combination Process |
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Received:July 06, 2020
Revised:July 13, 2020
Accepted:July 15, 2020
Published Online:October 31, 2020
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| DOI：doi：10.3969/j.issn.1007-7545.2020.11.006 |
| KeyWord:NaClO3; NaOH; NdFeB waste; hydrochloric acid priority solution; Fe2+ removal |
| Author | Institution |
| Deng Cao-feng |
赣州稀土友力科技开发有限公司 |
| Xiao Wei-dong |
赣州稀土友力科技开发有限公司 |
| Xiong Yong-de |
赣州稀土友力科技开发有限公司 |
| Xie Chun-bao |
赣州稀土友力科技开发有限公司 |
| Hu Wei-zhong |
赣州稀土友力科技开发有限公司 |
| Chen Jie-liang |
赣州稀土友力科技开发有限公司 |
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| Abstract: |
| Fe2+ removal efficiency of NdFeB waste hydrochloric acid priority solution by sodium chlorate oxidation - NaOH precipitation combined process was studied. Effects of sodium chlorate dosage, pH value of reaction end point, reaction temperature, reaction time and aging time on iron removal rate were investigated. The results show that Fe2+ removal rate is 99% above and Fe2+ content in filtrate solution is 120 mg/L below under the optimum conditions including sodium chlorate dosage of 1.1 times of theoretical dosage, reaction temperature of 70 ℃, reaction time of 2 h, pH value of precipitation end point of 3.50, and aging time of 8 h. The process has been successfully applied in our company to remove Fe2+ from hydrochloric acid priority solution. |
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