Method for recycling noble metal from spent catalyst

Abstract

The invention discloses a method for recovering noble metal from a noble metal waste catalyst. The method essentially comprises the following steps: the waste catalyst containing noble metal is pre-treated; the noble metal is leached in solution; the noble is purified and recovered from the solution, wherein, the immersion fluid contains sodium hypochlorite, hydrogen ion, sulfate ion and phosphate ion with low cost, small pollution and small danger, and is easy to be industrialized; in addition, the mixed acid of sulphuric acid and phosphoric acid in appropriate ratio is characterized by stable performance, no volatilization, strong noble metal dissolution capability and the like. What is more, the pre-treatment of the waste catalyst containing noble metal is sectional calcinations, so that the carbon accumulated on the waste catalyst is burned more clearly and more thoroughly, which is good for the recovery of the noble metal in the follow-up step and improves the recovery rate of the noble metal.

Description

A method for recovering precious metals from spent catalysts 1. Technical field The invention belongs to a method for recovering metal components from spent catalysts, in particular to a method for recovering precious metals from spent catalysts containing precious metals. 2. Background technology With the advancement of science and technology and the improvement of environmental regulations, precious metals are not limited to making decorations and playing a role in economics and finance, but also have been used in industrial production processes, especially in the catalysts used in petrochemical processes. application. Solid-phase noble metal catalysts generally use inorganic refractory oxides such as alumina, silica, and molecular sieves as carriers, and noble metals are loaded on the carriers. Since precious metal resources are scarce and expensive, it is very necessary to recover precious metals from spent catalysts containing precious metals, which can not only mak...

AI Technical Summary

Problems solved by technology

The immersion liquid used in the above two methods still has the problems of being volatile, endangering operators, and polluting the environment, and the leaching effect of the immersion liquid on precious metals also needs to be further improved.

In addition, in the above-mentioned methods, waste materials containing precious metals are treated at high temperature. For catalysts deactivated by carbon deposits, especially spent catalysts with a large amount of carbon deposits, due to the concentrated heat release and improper temperature control during high-temperature calcination, It will make it difficult to completely remove the carbon deposit attached to the catalyst, and then carry out conventional leaching, which will inevitably lead to a low recovery rate of precious metals