氯化焙烧法处理宜春锂云母矿提取锂钾的研究

采用氯气作氯化剂氯化焙烧江西宜春锂云母矿提取锂、钾, 研究了氯化焙烧温度、时间及添加剂对锂云母氯化效率的影响, 并采用XRD对焙烧后物料进行了物相分析。结果表明: 以氯气处理锂云母, 氯化焙烧温度为850 ℃, 时间为3 h时, 锂、钾的提取率分别为92.49%和71.06%; XRD结果表明, 焙烧后物料主要物相为LiAl(SiO₃)₂、SiO₂、KCl、NaCl、K(Si₃Al)O₈。当添加与锂云母质量比为0.7的氧化钙后, 物料的熔点明显提高, 900 ℃下氯化焙烧30 min时, 锂的浸出率为92.5%, 钾的提取率提高到96.7%。添加氧化钙焙烧后浸出渣主要物相为Ca_0.65Na_0.35(Al_1.65Si_2.35O₈)、CaF₂、SiO₂。

Extraction of Lithium and Potassium from Yichun Lepidolite by Chloridizing Roasting

Yichun lepidolite from Jiangxi was roasted by chlorine to extract lithium and potassium.The effects of chloridizing roasting temperature,time and additive on the chloridizing efficiency were studied.X-ray diffraction(XRD) was employed to characterize the residues.The results showed that the extraction efficiencies of lithium and potassium were 92.4% and 71.06% respectively after the chloridizing roasting of lepidolite at 850 ℃ for 3 hours.The XRD analysis indicated that the main phases of the residues were LiAl(SiO3)2,SiO2,KCl,NaCl and K(Si3Al)O8.After adding calcium oxide with a mass ratio to lepidolite of 0.7,the melting point was increased obviously.The extraction efficiency of lithium was about 92.5% while the extraction efficiency of potassium was increased to 96.7% after roasting at 900 ℃ for 30 mins.The main phases of residues were Ca0.65Na0.35(Al1.65Si2.35O8),CaF2 and SiO2.