A method for recovering rhodium from organic waste liquid containing acetylacetone rhodium

By using decompression enrichment and sulfide precipitation techniques to break down chelated organic rhodium complexes under mild conditions, the problem of difficult rhodium recovery was solved, achieving efficient rhodium recovery and solvent resource utilization, while reducing safety risks and solvent consumption.

CN122038775BActive Publication Date: 2026-07-07YUNNAN PRECIOUS METALS LAB CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
YUNNAN PRECIOUS METALS LAB CO LTD
Filing Date
2026-04-03
Publication Date
2026-07-07

AI Technical Summary

Technical Problem

Existing technologies are unable to effectively break down chelated organorhodium complexes under mild conditions, resulting in difficulties in rhodium recovery and easy loss due to entrainment, as well as safety and equipment corrosion risks.

Method used

A method of depressurization enrichment-synergistic complex breaking and phase inversion-controlled sulfidation precipitation is adopted. Low-boiling-point organic components are removed by depressurization evaporation, and easily soluble rhodium complexes are formed in the aqueous phase using chlorine-containing complex exchange agents and alkaline complex breaking agents. Rhodium sulfide precipitates are generated by controlling the pH value and the sulfidation precipitant, thereby achieving interphase migration and solid-liquid separation.

Benefits of technology

It achieves efficient rhodium recovery under mild conditions, reduces entrainment losses, minimizes solvent consumption and hazardous waste generation, and improves recovery efficiency and process safety.

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Abstract

The present application relates to a kind of method for enriching and recovering rhodium from organic waste liquid containing rhodium acetylacetone, belong to the technical field of secondary resources recovery of precious metal.The organic waste liquid containing rhodium acetylacetone is evaporated under reduced pressure, and low-boiling organic components are separated and recovered by condensation to obtain distillation residue containing rhodium acetylacetone;Rhodium acetylacetone is broken down by adding water phase breakage system and stirring reaction in the distillation residue, and rhodium is transferred into the water phase, the organic phase and the water phase are separated, and the water phase containing rhodium is obtained;The water phase containing rhodium is adjusted by alkaline solution under stirring condition, and the pH is stably controlled to be 6-9, while the solution of sulfidation precipitant is added dropwise, and the rhodium sulfide precipitate containing rhodium is generated by reaction and aging treatment for 0.5-4 h, and the rhodium enrichment product is obtained by solid-liquid separation, and the rhodium enrichment product is washed and dried to obtain rhodium enrichment product.The process of the present application is simple, and the rhodium in the organic waste liquid containing rhodium acetylacetone can be efficiently transferred and enriched.
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