Method for reducing osmium secondary absorption liquid

Abstract

The invention discloses a method for reducing secondary osmium absorption liquid, which comprises the following steps: adjusting the pH value of the secondary osmium absorption liquid to 5-7, and controlling the concentration of the secondary osmium absorption liquid to be 25-30g / L; and heating the secondary osmium absorption liquid to 55-65 DEG C, adding an ethanol solution, reacting for 1-2 hours at the constant temperature of 55-65 DEG C, filtering and washing to obtain the metal osmium. The ethanol solution is used for replacing hydrazine hydrate reduction osmium secondary absorption liquid, so that the cost is reduced. According to the method, the pH of the osmium secondary absorption liquid is adjusted before the ethanol solution is added, so that the osmium precipitation rate of the osmium absorption liquid can be effectively controlled; hydrazine hydrate is replaced with an ethanol solution, and due to the fact that hydrazine hydrate is a strong reducing agent and has certain dangerousness, the safety risk is reduced; according to the method, the osmium absorption liquid is heated to 55-65 DEG C before the ethanol solution is added for reduction, the reduction efficiency is effectively improved, the osmium reduction rate is larger than or equal to 99%, and the content of osmium in the liquid after reaction is smaller than or equal to 0.01 g / L.

Description

technical field [0001] A method for reducing osmium secondary absorbing liquid, in particular to a method for reducing osmium-containing absorbing liquid, belonging to the field of precious metal metallurgy. Background technique [0002] Precious metals, especially platinum group metals, have unique physical and chemical properties and have become important materials for modern industry and national defense construction. They are widely used in national defense, fine chemicals, petrochemicals, medicine, energy, waste gas purification, biological engineering, metallurgical industry field. The application of precious metals in the above-mentioned fields is realized by their compounds or complexes as carriers, and there are many kinds of products and wide applications. At present, osmium refining uses the osmium primary absorption liquid produced by distillation as a raw material, and performs reduction, secondary distillation, and osmium powder products are produced after ref...

AI Technical Summary

Problems solved by technology

But because hydrazine hydrate is a kind of strong reducing agent, there is certain potential safety hazard; And hydrazine hydrate is expensive, causes cost too high; And hydrazine hydrate reacts violently in the reduction process, and the reaction process is more difficult to control; And the addition of hydrazine hydrate Difficult to control, it is difficult to grasp the end point of judging the complete restoration

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