The invention relates to a method for mutual separation of platinum group elements, which can effectively separate impurities from palladium, platinum, iridium, ruthenium and rhodium by using high safety compounds and procedures to prevent the increase of impurities in mother liquor relative to platinum group elements and the decomposition of chlorine complex. Is characterized by including the pge contents of containing impurities leaching process 1 and 2 of impurities generated from leaching liquid extraction process, liquid extracted from residual solvent extraction of palladium 3 process, from the extraction raffinate solvent extraction process 4 of cationic impurity elements, hydrolysis extraction raffinate separation of platinum 5 processes, from the precipitation leaching 6 process, and solvent extraction separation of ruthenium The seventh step in which iridium is extracted to obtain the back extraction solution containing iridium and the extraction residue containing rhodium.
Separation method between pge and is involved in detail from pge contents containing impurity elements from each other in the platinum group elements, the method of using compound and technology of the high security, prevent the impurity element relative to the platinum group elements in the mother liquor containing rate rising and chlorinated complex decomposition, effectively removing the impurity elements, Palladium, platinum, iridium, ruthenium and rhodium can be separated from each other with product purity.
Pge is scarce resources elements, from platinum ore containing high concentrations of pge class production of natural mineral, pge industrial production materials, mostly from copper, nickel, cobalt and other non-ferrous metal smelting by-products and, from automobile exhaust catalyst using the spent catalyst, etc.
By-products from the nonferrous metal smelting, by containing trace amounts in the smelting raw material of platinum, palladium, iridium, rhodium, ruthenium and osmium of pge because of its chemical properties is concentrated in the main metals such as copper, nickel sulfide concentrate and thick metal, and then in the main metal recycling processes such as electrolytic refining as residue to contain platinum group elements such as isolated in the form of precious metal concentrations.
In general, the concentration contains noble metals such as gold and silver, VI elements such as selenium and tellurium, and V elements such as arsenic, which are other component elements, in high concentrations compared with platinum elements. Then, after the recovery of gold and silver, platinum group elements containing impurities can be obtained, the separation and recovery of platinum group elements. For industrial separation of platinum group elements from the above platinum group element contents, usually using immersion in liquid, using solvent extraction, adsorbent and other separation technologies to separate each other and recovery after refining.
