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Basic Principles of Rhodium Refining

     

Basic Principles of Rhodium Refining:Rhodium refining is entirely conducted in solution. Crude rhodium metal must first be dissolved, and the sodium bisulfate melting-dilute sulfuric acid leaching method is employed to prepare a relatively high-purity chlororhodic acid solution. Rhodium raw material is mixed and melted with sodium bisulfate; after the melt cools, it is leached with dilute sulfuric acid, and rhodium enters the solution as rhodium sulfate. 

The rhodium sulfate solution is neutralized and hydrolyzed with alkali solution to form rhodium hydroxide precipitate, which is then boiled and dissolved in hydrochloric acid to obtain chlororhodic acid solution. Chlororhodic acid solution reacts with sodium nitrite at high temperature to form rhodium nitro complex. Ammonium chloride is added to the filtered solution to precipitate ammonium sodium hexanitrorhodate; the precipitate is dissolved and boiled in hydrochloric acid, then hydrolyzed and reduced with formic acid to obtain rhodium black, and finally high-purity rhodium powder is obtained via hydrogen reduction at high temperature.

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