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rhodium refining process

     

rhodium compounds are added to the reaction vessel, followed by King's solution for dissolution. After the reaction is complete, high-precision filters are used for filtration. The rhodium liquid is pumped back into the reaction vessel and treated with a base for water washing. After completion of the rhodium washing, high-precision filters are again employed for filtration. The rhodium wash residue is then added to the reaction vessel and acidified for dissolution. The filtered chlororhodium solution is transferred to a tank for concentration. Subsequently, it enters an off-centered extractor for rhodium extraction. The reverse extraction liquid undergoes reduction to yield rhodium powder, which is sent to a hydrogenation unit for further processing.

After extraction of rhodium, the waste water is treated with activated carbon and pumped into storage tanks for settling. Regularly, the sludge is removed through the settler unit for water replacement.

In the King's solution dissolution process, high-concentration nitrogen oxides are collected via a condenser and fed into a tower scrubber for absorption. Gases generated from the reaction vessel (both overhead and filter residues) are collected by a hood system and treated in the tower scrubber. Additionally, alkaline waste gases from rhodium washing and leaching exhaust fumes pass through the tower scrubber for final treatment before being released. The process ensures all emissions meet environmental standards and are discharged appropriately.

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