Method for recovering precious metal from precious metal-containing waste catalyst
AssigneeHeraeus Precious Metal Technology (China) Co., Ltd.
InventorsBin Zhang, Chen Chen
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Abstract
A method for recovering a precious metal from a precious metal-containing waste catalyst includes the following steps: i) at least partially dissolving a precious metal-containing waste catalyst in an alkaline aqueous solution; ii) performing filtering to obtain a precious metal-containing filtrate and a precious metal; iii) treating the filtrate with a reducing agent; and iv) separating the precious metal from the filtrate after treatment, wherein step iii) is performed under a pressure of 8-12 bar at a temperature of 190-210° C. for 2-4 h. The method provided in the present invention has a simple process and a high recovery rate. The filtrate obtained from separation comprises a precious metal of 1 ppm or less by weight.
Claims20
A method for recovering a precious metal from a precious metal-containing waste catalyst, the method comprising the following steps:
- i) at least partially dissolving a precious metal-containing waste catalyst in an alkaline aqueous solution, where the precious metal-containing waste catalyst is a supported catalyst comprising an SiO2 carrier and a precious metal, where the precious metal is one or more of platinum, palladium, rhodium, iridium, osmium, ruthenium, gold, and silver;
- ii) performing filtering to obtain a precious metal-containing filtrate and the precious metal;
- iii) treating the filtrate with a reducing agent;
- and
- iv) separating the precious metal from the filtrate after treatment,
- wherein step iii) is performed under a pressure of 8-12 bar at a temperature of 190-210° C. for 2-4 h.
Dependencies are inferred from the claim text.