Method for recovering rare precious metals from solution

Abstract

The invention relates to a method for recovering rare precious metals from a solution, which recovers the rare precious metals from the solution by adopting an SO2 direct-reduction process. The method comprises the following steps of: regulating the acidity of the solution containing the rare precious metals, adding a compound containing chloridions, introducing SO2 to react for a certain time under a heating condition, and then filtering to obtain rare precious metal slag; lixiviating the rare precious metal slag by using a Na2SO3 solution, and filtering to obtain separated selenium slag and a solution containing selenium; adding sulfuric acid to the solution containing the selenium, heating, and then filtering to obtain selenium slag; lixiviating the separated selenium slag by using a mixed solution of the sulfuric acid and hydrogen peroxide, and filtering to obtain precious metal concentrates and a solution containing tellurium; adding the compound containing the chloridions to the solution containing the tellurium, introducing SO2 for reduction, and filtering to obtain tellurium powder. The invention recovers the rare precious metals contained in the solution through the reduction by using the SO2; and in addition, compared with a zinc powder reduction method, the method has the advantages of simplicity, easy operation, low cost and high comprehensive utility ratio.

Description

technical field [0001] The invention relates to a solution resource recycling technology containing rare precious metals, which realizes the recovery of rare precious metals from the solution. Background technique [0002] Selenium (Se) and tellurium (Te) are both rare elements. Selenium is a solid with metallic luster, which can conduct electricity and heat, and its conductivity can change sharply with the intensity of light. The chemical properties of selenium are similar to that of sulfur, but its metallicity is stronger than that of sulfur. The most remarkable property of selenium is its photoelectric effect, which can be used in photovoltaic cells; in addition, it is also used in metallurgy, glass, rubber industry and other fields. Tellurium is a silver-gray semi-metal with high resistivity, a diamagnetic metal, and a good semiconductor material. The chemical properties of tellurium are similar to selenium, the difference is that tellurium hardly interacts with hydro...

AI Technical Summary

Problems solved by technology

However, the content of platinum and palladium in the platinum palladium concentrate obtained by the zinc powder replacement method is low, and the loss of platinum and palladium is large when reclaiming platinum and palladium, resulting in the loss of selenium and tellurium, and the amount of zinc powder is large