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High-Efficiency Recovery of Platinum Group Precious Metals

     

Method for High-Efficiency Recovery of Platinum Group Precious Metals from Platinum-Containing Organic Alcohol Waste Liquor

To solve the defects of existing methods such as complex process, low platinum recovery rate, high energy consumption, environmental unfriendliness, poor product purity and potential safety hazards:

The method comprises the following steps: filter the platinum-containing organic alcohol waste liquor, remove filter residues to obtain a clear filtrate, and adjust the pH of the filtrate to 1.0-2.0 with acid or alkali liquor;

Under continuous stirring, add excess weak reducing agent into the pretreated platinum-containing organic alcohol waste liquor for reaction. The weak reducing agent refers to a reducing reagent whose reduction potential under the acidic condition of pH=1.0-2.0 can reduce metals with metal activity equal to or lower than platinum, but is not sufficient to reduce metals with potential higher than H⁺ potential;

Filter the reacted solution to obtain filter residues and tail liquor. The filter residues are washed and roasted to obtain powdery platinum group precious metals. The recovery process has the advantages of simple operation, short flow, high recovery rate, high product purity and low cost, and is of great industrial application value.

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