Method for recovering noble metal from waste noble metal catalyst

一种从废弃贵金属催化剂中回收贵金属的方法

Abstract

The invention discloses a method for recovering noble metal from a waste noble metal catalyst. Precipitates can be formed by added sodium sulphide and activated carbon and noble metal ions separated from carriers in the use process, then the precipitates are adsorbed to activated carbon, part of noble metal is prevented from being lost, and the recovery rate is increased; the activated carbon and organic matter are removed through high-temperature combustion, the size is reduced, and beneficial conditions are provided for subsequent noble metal dissolution; smashing is conduced for enlarging the reaction area and improving the reaction completion rate; due to the dissolution by means of hydrochloric acid and hydrogen peroxide, the situation that other impurity elements are brought into a final solution and influence the direct use of the noble metal salt solution can be reduced; the method is easy to operate, the recovery extraction rate of noble metal is greatly increased, and the recovery rate can reach 99.0% or above; compared with a traditional noble metal recovery method, the emission of harmful gases is reduced, the pollution to the environment is reduced, and the method is worthy of popularization.
本发明公开了一种从废弃贵金属催化剂中回收贵金属的方法,加入硫化钠和活性炭可以与在使用过程中脱离载体的贵金属离子形成沉淀,进而吸附在活性炭上,防止该部分贵金属的流失,提高回收率;通过高温焚烧除去活性炭和有机物,减少体积,为后续贵金属溶解提供有利条件,粉碎的目的是为了增大反应面积,提高反应完成率,利用盐酸和双氧水溶解可以减少给最终溶液中带入其他杂质元素,影响贵金属盐溶液的直接使用,本方法操作简单,大大提高了贵金属的回收提取率,回收率可以达到99.0%以上,相比于传统的贵金属回收方法减少了有害气体的排放,降低了对环境的污染,值得推广。

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