Extraction reprocessing of fluoride-sulphuric acid solutions resulting from plumbomicrolite concentrate decomposition

The paper discusses solvent extraction of high-purity tantalum and niobium compounds from fluoridesulphuric acid solutions resulting from the acidic decomposition of plumbomicrolite concentrate, proposing a flowsheet for sequential selective extraction of target components. The extraction of Ta(V) was studied using triisoamylphosphate and octanol-1 (OCL-1). The latter has proved to be effective for extracting both Ta(V) and Nb(V). There have been selected optimal regimes for all extraction stages to provide a high quality of target products (Ta2O5, K2TaF7, Nb2O5).