Recovery process of rhodium-containing waste catalyst solution

Abstract

The invention relates to the field of catalyst recycling in chemical industry, in particular to a recovery process of rhodium-containing waste catalyst solution. The process adopts strong base as precipitation reagent so that rhodium in the solution is separated from waste catalyst solution in precipitation form. The strong base is selected from any one of sodium hydroxide, potassium hydroxide and cesium hydroxide. The solution of the strong base is added to rhodium-containing waste catalyst solution and heating and stirring are carried out for 1-5h at the temperature of 80-100 DEG C so that a precipitation reaction occurs, namely, solid rhodium hydroxide can be obtained. The mol ratio of rhodium to strong base in the waste catalyst solution is 1: (6-12). By adopting the principle that the dissolution constant of rhodium hydroxide in water solution is extremely small, rhodium in the solution is separated from the waste catalyst solution in precipitation form; and the recycling method is efficient and quick, and the recovery rate of rhodium is more than 97%.

Description

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AI Technical Summary

Benefits of technology

This new technology makes it possible for ruthenium (Rh) metal powders that were previously used only once or twice before being discarded into landfills quickly recovering more than 97 percent of its original content.

Problems solved by technology

This patents describes different ways to extract or separate valuable metals like silver (Ag) from various materials containing these compounds. One way involves burning them down into ash after they have been extracted through evaporation techniques. Other options involve separating the pyrolysis products formed due to decomposition reactions between oxygenated bases and other substances produced when decomposing certain types of molecules called organochlorine monomers. These technical problem addressed by this patented technology include finding efficient processes for efficiently removing unwanted residues while minimizing damage caused by excessively strong reducing agents commonly found on zirconia based catalysis systems.