Preparation method of high-purity rhodium powder

Abstract

The invention provides a preparation method of high-purity rhodium powder. The preparation method of the high-purity rhodium powder comprises the following steps: 1. dissolving platinum-rhodium alloy in a mixed solution of concentrated hydrochloric acid and concentrated nitric acid, then heating the solution and carrying out acid and nitrate removal, and determining a nitrate removal degree; 2, adding alkali into the solution obtained in the step 1 to adjust the pH value to be 17, and filtering; 3, adding a reducing agent and a rhodium coordination agent into the filtrate obtained in the step 2, carrying out a heating reaction, and filtering to obtain a filter cake of a rhodium compound; 4, adding water into the filter cake obtained in the step 3 to carry out slurry mixing, adding alkali to adjust the pH value to be 17, and carrying out suction filtration after heating and stirring to obtain a high-purity filter cake of the rhodium compound; 5, dissolving the filter cake obtained in the step 4 with hydrochloric acid, then adjusting the pH value to 26 with sodium hydroxide, and slowly adding hydrazine hydrate for reduction to obtain rhodium black; and 6, introducing hydrogen into the rhodium black obtained in the step 5 for reduction to obtain the high-purity rhodium powder. According to the invention, the high-purity rhodium powder is prepared by rapidly purifying from the precious metal platinum-rhodium alloy, and the process is simple.

Description

technical field [0001] The invention belongs to the technical field of recovery and purification of precious metals, and in particular relates to a preparation method of high-purity rhodium powder. Background technique [0002] Because of their excellent characteristic charm and eternal value, precious metals play an extremely important role in the long civilized world of human beings. widely used. For example: Platinum-rhodium alloys are used industrially for temperature measuring element thermocouples, thermal resistances, crucibles and vessels used in the production of high-quality optical glass, and catalyst materials. [0003] In recent years, more and more attention has been paid to the application of precious metals in emerging cutting-edge industries, and they are called the vitamins of today's industries. In particular, the application of high-purity precious metals is more prominent, but the process of preparing high-purity precious metals is very complicated, es...

AI Technical Summary

Problems solved by technology

In particular, the application of high-purity precious metals is more prominent, but the process of preparing high-purity precious metals is very complicated, especially the purification of rhodium from platinum-rhodium alloys, and the preparation of high-purity rhodium powder requires a very complicated process, such as acid-base hydrolysis, resin Repeated work such as exchange, organic solvent extraction, etc.

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