This work proposes the roasting of amblygonite with calcium sulfate followed by water leaching to extract lithium and phosphorus. Various roasting parameters including roasting temperature, the mass ratio CaSO/ore, roasting time as well as leaching parameters, such as the liquid/solid ratio, temperature and time, have been carefully investigated. The lithium extraction efficiency can be as high as 99.8% with a mass ratio of CaSO/ore of 0.85 after roasting at 775 °C for 1 h and water leaching at a liquid/solid ratio of 3 mL/g at 100 °C for 2 h. The XRD analysis demonstrates that the fluoride in the amblygonite can be converted into Ca(PO)F and CaF. Lithium in the leach liquor can be recovered as LiCO. Meanwhile, the phosphorus in the water leach residue can be recovered as FePO with a high recovery of 96.6% after acid dissolution and precipitation, which can be further treated to produce LiFePO.

中文翻译：

---

硫酸钙焙烧水浸从锂磷锂石中提取锂和磷

这项工作提出用硫酸钙焙烧锂辉石，然后水浸以提取锂和磷。对各种焙烧参数（包括焙烧温度、CaSO4/矿石质量比、焙烧时间）以及浸出参数（如液固比、温度和时间）进行了仔细研究。775 ℃焙烧1 h，100 ℃液固比3 mL/g水浸2次后，CaSO4/矿石质量比为0.85，提锂效率高达99.8%。 H。XRD分析表明，锂锂石中的氟化物可以转化为Ca(PO)F和CaF。浸出液中的锂可以以 LiCO 的形式回收。同时，水浸渣中的磷经酸溶沉淀后可以以磷酸铁的形式回收，回收率高达96.6%，并可进一步处理生产磷酸铁锂。