【摘要】 微山稀土精矿经固氟后,采用氯化铵法回收稀土. 通过单因素条件实验确定了矿物固氟和氯化焙烧的较宜条件:固氟温度为550oC,固氟剂用量与精矿质量比为1:20,固氟焙烧时间50 min; 氯化剂用量与精矿质量比为1.2:1,氯化焙烧温度480oC,氯化时间60 min. 在较宜条件下,稀土的浸出回收率在87.8%以上. 利用X射线衍射探讨了固氟过程中可能发生的反应.更多还原

【Abstract】 A process for recovery of RE from the Weishan rare earth concentrate was developed by incorporation of fluorine-fixing and RE concentrate chlorinating with ammonium chloride. The suitable conditions were determined as follows: Fluorine-fixing time of 50 min, MgO dosage mMgO/more=1:20 at 550oC. Chlorinating the fluorine-fixed calcine by 60 min, with NH4Cl dosage mNH4Cl/more=1.2:1 at 480oC, the leaching recovery of RE reaches 87.8% under the above conditions. The possible reactions in the fluorine-fixing process were discussed with the X-ray diffraction spectrum.更多还原