Method for extracting osmium, iridium and ruthenium

Abstract

The present invention relates to extraction and refining process of noble metal in the metallurgical industry. Said process includes the following steps: using zinc and aluminium alloy to break mineral material, using pyrogenic process to distil osmium, steaming residue and using sodium peroxide to make alkali fusion, leaching-out and using ethyl alcohol to settle ruthenium from leaching-out liquor. Said ivnention can reduce dose of breaking agent, its osmium distillation process does not consume oxidation reagent, it can obtain good effect for separating osmium and ruthenium, after alkali fusion the ruthenium can be enriched, so that it is favorable for extraction. Said invention is suitable for treating iridosmine, osmium-iridium mine, nitro-muriatic acid insoluble mineral material containing noble metals of ruthenium and irdium and mineral material containing osmium, ruthenium and iridium.

Description

Technical field: [0001] The invention relates to the extraction and refining of precious metals in the field of metallurgy, in particular to a method for extracting osmium, iridium and ruthenium from aqua regia insoluble materials. Background technique: [0002] The traditional treatment method is to first form an alloy with zinc or aluminum, which is often called "crushing", and then dissolve the zinc or aluminum with hydrochloric acid or sulfuric acid to obtain active precious metal powder, and then carry out wet distillation of osmium and ruthenium; [0003] Or the crushed material is melted with a mixture of sodium peroxide and sodium hydroxide, and the frit is subjected to wet distillation to distill osmium and ruthenium. See "Platinum Group Metal Mining and Metallurgy" edited by Liu Shijie, pages p285-288 and p294-300, which was published by Metallurgical Industry Press in 2001. [0004] But there is following defect in above-mentioned method: [0005] ①Using zinc fr...

AI Technical Summary

Problems solved by technology

[0005] ①Using zinc fragmentation, the amount of zinc used is relatively large, and the oxidation of zinc is serious at high temperature, resulting in poor fragmentation effect;

[0006] ② Using aluminum fragmentation, the reagent consumption is large when dissolving aluminum, and the solid-liquid separation after dissolution is difficult;

[0007] ③ Separation of osmium and ruthenium by wet distillation not only needs to consume a large amount of more expensive sodium bromate or sodium chlorate, but because the osmium is distilled out earlier in the separation process, a large amount of chloride ions or bromide ions are retained in the solution, and The distillation effect of ruthenium is poor; and, in the distillation process of osmium and ruthenium, part of iridium and other precious metals, such as platinum, palladium, and gold, enter the solution, and the other part remains in the slag, resulting in the dispersion and loss of precious metals

Images