NaClO3氧化-NaOH沉淀联合法去除钕铁硼废料盐酸优溶液中的铁(Ⅱ)

Removal of Iron(Ⅱ)from NdFeB Waste Hydrochloric Acid Priority Solution by NaClO3 Oxidation-NaOH Precipitation Combination Process

研究了NaClO3氧化-NaOH沉淀联合法对钕铁硼废料盐酸优溶液中Fe^2+去除效果,考察了氯酸钠用量、反应终点pH、反应温度、反应时间和陈化时间对Fe^2+去除率的影响。结果表明,在下述最佳工艺条件下,Fe^2+的去除率超过99%,除铁后滤液中Fe^2+含量小于120mgL:NaClO3用量为理论计算质量1.1倍、反应温度70℃、反应时间2h、沉淀终点pH=3.50、陈化时间8h。该工艺已成功应用于本公司盐酸优溶液除Fe^2+工艺中。

Fe^2+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 Fe^2+removal rate is 99%above and Fe^2+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 Fe^2+from hydrochloric acid priority solution.