Preparation method of high-purity superfine rhodium powder

By employing hydrochloric acid dissolution, weak alkaline reduction, and precisely controlled reduction processes, the problems of high purity, ultrafine particle size, and low alkali metal impurities in rhodium powder preparation have been solved, resulting in high-purity ultrafine rhodium powder suitable for high-end catalyst applications.

CN122099352APending Publication Date: 2026-05-29CHENGDU GUANGMING PAITE PRECIOUS METAL CO LTD
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
CHENGDU GUANGMING PAITE PRECIOUS METAL CO LTD
Filing Date
2026-03-17
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

Existing methods for preparing rhodium powder cannot simultaneously achieve high purity, ultrafine particle size, and low alkali metal impurity content.

Method used

Rhodium powder is dissolved by reacting hydrochloric acid with chlorine gas, and the pH value is controlled at 7-10. A weak alkaline reducing agent such as hydrazine hydrochloride is used for reduction. Combined with stirring and hydrogen reduction treatment, the addition rate of the reducing agent and the stirring intensity are precisely controlled to avoid the introduction of alkali metal impurities.

Benefits of technology

High-purity ultrafine rhodium powder with a purity of β‰₯99.99%, sodium content ≀50ppm, potassium content ≀50ppm, and particle size ≀10ΞΌm was prepared, which reduced equipment corrosion and operating costs and broadened its application prospects in high-end catalysis.

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Abstract

The application discloses a preparation method of high-purity superfine rhodium powder and belongs to the technical field of precious metal separation. The method is specifically as follows: high-purity rhodium powder is mixed with hydrochloric acid, chlorine gas is introduced to heat, dissolve and filter and concentrate to obtain a rhodium trichloride solution; alkali liquor is added to the solution to adjust the pH to 7-10, the stirring speed is controlled after heating, and a reducing agent is added at a specific rate to carry out a reduction reaction, alkali liquor is supplemented to maintain the pH stable during the process, and the rhodium is completely converted into rhodium black until the end; finally, the obtained rhodium black is washed, dried and treated by hydrogen reduction to obtain high-purity superfine rhodium powder. The high-purity rhodium powder with high purity, low sodium and potassium content and superfine particle size is obtained by adopting high-purity raw materials, controlling the reaction system in a weak alkali environment and cooperatively controlling the adding rate of the reducing agent and the stirring intensity.
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