Method for directional reduction and recycling of platinum in waste liquid

Abstract

This application provides a method for the targeted reduction and resource recycling of platinum in waste liquid. A weak reducing agent with a standard electrode potential between 0 and 0.7 V is slowly added dropwise to the solution to be treated. The solution is stirred while maintaining the pH value between 1 and 3 at an environment of 30℃-60℃. 4+ Directional reduction to Pt 2+ A first reducing solution is formed; the first reducing solution is introduced into the adsorption device of the chelating resin, whereby the chelating resin can selectively adsorb Pt. 2+ This process forms a platinum-supported resin; the platinum-supported resin is then desorbed to obtain a Pt-rich product. 2+ The second reducing solution is adjusted to a pH between 4 and 6, and then a reducing agent is added to reduce Pt. 2+ The above method precipitates elemental platinum by selecting a weak reducing agent and under mild reducing conditions. 4+ Directional reduction to Pt 2+ Further Pt 2+ This method reduces the substance to elemental Pt, avoiding the problem of increased impurities in the solution caused by the reducing agent itself transforming into metal ions, as is common in active metal displacement methods.

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