Production of Metallic Oxide and Metal Powders by Crystallization Stripping Applying Solvent Extraction

Abstract

The fundamental studies on production of metallic oxide and metal powders with crystallization-stripping using NH₄HF₄, (NH₄) ₂S04 and pressurized C0₂ gas as crystallization-stripping agent in solvent extraction were carried out in order to develop a new production method of fine powders.

The reaction significantly relates to the stripability of the extracted metal tons and the solubility of the metal compounds formed in crystallization process. Furthermore, the reaction depends on the various factors, such as extractant concentration, metal concentration in the organic phase, the sort of stripping solution and still more CO₂ pressure in the pressurized CO₂ process.

The resultant crystallized products can be converted to fine powders of high-purity metallic oxide and metal in micron order by thermal decomposition in air or hydrogen atmosphere, respectively.