采用碳酸氢铵-氨水混合沉淀剂制备碳酸镧的研究

发布时间：2018-05-14 07:41

  本文选题：碳酸镧 + 碳酸氢铵　； 参考：《稀有金属与硬质合金》2017年02期

【摘要】：以碳酸氢铵-氨水作为混合沉淀剂,氯化镧溶液为料液,采用并流沉淀法制备碳酸镧产品,考察了底液中稀土浓度、反应时间及沉淀废水回用对产品质量的影响,并对产品物相结构和形貌进行了表征,最后与采用碳酸氢铵作为沉淀剂的工艺进行了技术指标对比。结果表明,在控制底液中稀土浓度为30g/L,反应时间为7h,沉淀废水回用的条件下,产品的主要成分为La_2(CO_3)3·8H_2O,Cl~-含量0.07%,稀土总量≥45%。沉淀1t稀土氧化物产出5.9m~3沉淀废水,废水中氯化铵含量为169g/L。与采用碳酸氢铵作为沉淀剂的工艺相比,采用混合沉淀剂一方面大幅降低了废水的产出量,进而减少了废水的治理成本;另一方面有效利用了C元素,从而降低了温室气体CO_2的排放量和碳酸氢铵的使用量,具有良好的经济和环境效益。
[Abstract]:Using ammonium bicarbonate and ammonia as mixed precipitating agent and lanthanum chloride solution as feed solution, lanthanum carbonate products were prepared by parallel flow precipitation method. The effects of rare earth concentration, reaction time and reuse of precipitation wastewater on product quality were investigated. The phase structure and morphology of the product were characterized and compared with the technology using ammonium bicarbonate as precipitant. The results showed that under the conditions of controlling the concentration of rare earth in the solution of 30 g / L, reaction time of 7 h and the reuse of precipitation wastewater, the main component of the product was La_2(CO_3)3 _ 8H _ 2O _ 2O _ (Cl-O _ (-) -0.07%), and the total amount of rare earth was 鈮，

本文编号：1886983