A kind of method that reclaims rhodium and prepares rhodium chloride from burning waste rhodium slag

Abstract

The invention provides a method for preparing rhodium chloride through recovering rhodium from incinerated waste rhodium residues. The method comprises the steps of firstly carrying out aerobic high-temperature roasting on waste catalyst roasting rhodium residues with incompletely removed organic matters, thus thoroughly removing the organic matters, and obtaining rhodium ash; then adding hydrofluoric acid and perchloric acid into the rhodium ash for pretreating, adding hydrochloric acid and hydrogen peroxide for directly dissolving the rhodium residues, and filtering to obtain a coarse rhodium acid solution; finally adopting an ion exchange method for the coarse chlororhodic acid solution to remove ion impurities such as Fe, Ni and Ca, and then concentrating and drying to obtain rhodium chloride hydrate. According to the method provided by the invention, a roasted rhodium residue post-treatment process is simplified, the efficiency is high, the rhodium loss is less, and the rhodium yield is larger than 99 percent.

Description

Technical field: [0001] The invention relates to the technical field of precious metal recovery, and more precisely provides a method for recovering rhodium from incinerated waste rhodium slag to prepare rhodium chloride hydrate. Background technique: [0002] Oxylation technology has become one of the most active frontier fields in the development of catalytic technology, and has become the development direction of modern chemical industry. Rhodium catalyst is the most commonly used catalyst for the oxo reaction of olefins. In industrial production operations, rhodium catalysts are easily poisoned by trace impurities and deactivated. The deactivated rhodium-containing catalyst waste liquid needs to be discharged at regular intervals. Rhodium resources are scarce and expensive, and rhodium in spent catalysts must be recovered. Rhodium chloride hydrate is the basic raw material for preparing rhodium compounds such as rhodium catalysts, and it is of great significance to recl...

AI Technical Summary

Problems solved by technology

However, although these methods can increase the yield of rhodium, the harsh temperature control conditions have too high requirements for industrial production operations, which is not conducive to production stability, and based on the consideration of rhodium overburning, there are still some organics that cannot be removed by incineration. deal with complex