A method for removing impurity lead from rhodium-iridium displacement slag

By reacting EDTA solution with rhodium-iridium replacement slag, the problem of efficient and stable removal of lead from rhodium-iridium replacement slag was solved, achieving efficient removal of lead and low loss of precious metals, simplifying the process flow, and making it suitable for the platinum group metals refining industry.

CN122445947APending Publication Date: 2026-07-24金川集团铜贵股份有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
金川集团铜贵股份有限公司
Filing Date
2026-04-10
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

In existing technologies, the lead removal effect in rhodium-iridium replacement slag is unstable, the lead removal rate is low, and the loss of precious metals is serious, which cannot meet the requirements of industrial production.

Method used

EDTA solution was mixed with rhodium-iridium displacement residue, with the solid-liquid ratio controlled at 1:5. The mixture was heated to 85-90℃ and kept at a constant temperature for 1.5-2.5 hours to complex lead with EDTA. The mixture was then cooled and separated to obtain lead-free filtrate and lead-free residue. Finally, platinum and palladium were recovered by chlorine gas and polyvinyl alcohol.

Benefits of technology

It achieves efficient and stable lead removal with a lead removal rate of ≥78%, low precious metal loss rate, simple process and compatibility with existing processes, and is easy to apply in industrial applications.

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Abstract

The application belongs to the technical field of platinum group metal refining, and specifically discloses a method for removing impurity lead from rhodium-iridium displacement slag, which solves the technical problem of high lead content in the rhodium-iridium displacement slag interfering with the subsequent platinum-palladium recovery process and product quality. The method comprises the following steps: liquid is prepared according to a solid-liquid ratio of 1:5 for the rhodium-iridium displacement slag, the liquid is heated to 85-90 DEG C, 200 g / L EDTA solution is added for reaction for 2 h, the lead removal liquid is discharged after cooling and filtration, and the filter residue is subjected to slurry, chlorine passing, and addition of solid ammonium chloride and polyvinyl alcohol for platinum-palladium reaction to recover platinum-palladium. The lead removal rate of the application can reach 78.9%, the slag rate is about 70%, the loss rate of precious metals is low, the process flow is short, the operation is simple, no new cumbersome process is needed, the existing upper and lower layer processes for platinum group metal separation and purification can be seamlessly connected, and the application is economic and environmentally friendly, and has important application significance for the separation and purification of platinum group metals.
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