Technology for extracting noble metals from rutheniridosmine

Abstract

A related technology for extracting noble metals from rutheniridosmine comprises crushing rutheniridosmine, using a fire method to oxidize and volatilize the vast majority of Os and using a NaOH solution to absorb Os, fusing residue with sodium peroxide and leaching with water, then using ethanol to reduce Ru, and sending the leaching slag to an iridium extraction process. The purity of products obtained in the technology are all larger than 99.9%, the noble metal total recovery rate is larger than 90%, the iridium recovery rate is larger than 95%, and relatively good economic benefit is obtained.

Description

technical field [0001] The invention relates to the field of ore extraction, in particular to a process for extracting precious metals from ruthenium iridium osmium ore. Background technique [0002] Ruthenium iridium osmium ore is a natural alloy of Ru, Ir and Os. It is silvery white, with a specific gravity of 17-21g / cm3. It is brittle and hard, and its chemical properties are very stable. Even if it is heated in aqua regia for several hours, it will not dissolve. It is characterized by high content of Os and Ru, which brings many difficulties to the metallurgical process. [0003] The traditional method of treating ruthenium, iridium and osmium ore is to first fuse with Zn or Al to form an alloy, then water quench to obtain fine alloy particles, then dissolve Zn or Al with hydrochloric acid or sulfuric acid to obtain active precious metal powder, and then oxidize and distill Os in aqueous solution and Ru. The disadvantage is that when zinc is used for alloying, the amou...

AI Technical Summary

Problems solved by technology

The disadvantage is that when zinc alloying is used, the amount of zinc is large, and the oxidation and burning loss is serious at high temperature, resulting in poor fragmentation effect; when aluminum alloying, the amount of hydrochloric acid to dissolve aluminum is large, and the solution is difficult to filter

In addition, when Os and Ru are oxidatively distilled, the operation time is >60h, and the distillation is not clean, and a large amount of oxidant is consumed

For example, when sodium bromate or sodium chlorate is used to oxidize and separate Os and Ru, Os is first distilled out in the form of OsO4, leaving a large amount of chloride or bromide in the solution, making the distillation of Ru very difficult.

Part of the material enters the steaming raffinate, and part remains in the slag, resulting in low recovery rate and dispersion of precious metals, long processing time, complicated process and high production cost