Processing of plumbomicrolite of amazonite deposit Ploskaya Gora (Kola Peninsula)

A plumbomicrolite concentrate (PMC) was decomposed with the mixture of HF and H2SO4, HF and HCl, HF and HNO3 acids. Optimal conditions ensuring high recovery of tantalum and niobium (99%) into solution, and radionuclides into insoluble residue were determined. Fluoride-sulfuric acid and fluoride-nitric acid schemes were proposed for PMC processing with an extraction separation of tantalum form niobium, lead and impurities and production of high-purity tantalum compounds.采用氢氟酸（HF）与硫酸（H₂SO₄）、氢氟酸与盐酸（HCl）、氢氟酸与硝酸（HNO₃）的混合酸体系，对铅细晶石精矿（plumbomicrolite concentrate, PMC）进行分解。确定了可实现钽与铌的溶液回收率达99%、放射性核素富集于不溶残渣中的最佳工艺条件。针对PMC的处理，提出了氟-硫酸体系与氟-硝酸体系两种工艺方案，通过萃取分离实现钽与铌、铅及杂质的分离，并制备得到高纯钽化合物。