Comprehensive recycling method of platinum-rhenium containing reformed spent catalyst

Abstract

The invention relates to a comprehensive recycling method of a platinum-rhenium containing reformed spent catalyst. The comprehensive recycling method is used for leaching rhenium by pressurizing and alkaline-dissolving, is used for enriching platinum by normal-pressure acid dissolving, and is also used for comprehensively recycling aluminum oxide. The main flow comprises: (1), grinding material, namely, grinding the platinum-rhenium containing reformed spent catalyst to obtain powder materials with a grain size of 30-100 meshes; (2), pressurizing and alkaline-dissolving, namely, leaching rhenium by adopting a pressurizing method under an alkaline system to obtain leaching liquor L1 and leaching residue S1; (3), refining and rhenium extracting, namely, adding soluble sylvite to the leaching liquor L1 for refining the rhenium; (4), carrying out acid dissolving, namely, dissolving the leaching residue S1 by using an acid solvent to obtain leaching liquor L2 and leaching residue S2; (5), carrying out platinum refining, namely, refining the platinum in the leaching residue S2 to obtain metal platinum; and (6), carrying out aluminum sulfate recycling, namely, crystallizing the aluminum sulfate in the leaching liquor L2 to obtain a water purifying agent. The comprehensive recycling method of the platinum-rhenium containing reformed waste catalyst is simple in process flow and high in platinum and rhenium comprehensive recovery rate, wherein the platinum comprehensive recovery rate is higher than 99%, and the rhenium comprehensive recovery rate is higher than 92%. Meanwhile, the carrier is comprehensively recycled and utilized, so that the comprehensive recycling method is relatively environment-friendly.

Description

Technical field [0001] The invention relates to the field of rare and precious metal recovery, in particular to a comprehensive recovery method of platinum, rhenium and alumina in a platinum-rhenium reforming waste catalyst. Background technique [0002] my country's primary resources are scarce of platinum and rhenium, and the annual output of mines is far from meeting the needs of industrial production. Therefore, it is of great significance to recover platinum and rhenium from secondary resources. The reforming catalyst is an indispensable catalytic catalyst in the petrochemical industry. The platinum-rhenium catalyst is used more in domestic oil refining and reforming devices. With the development of the petrochemical industry, the amount of platinum-rhenium catalyst is also becoming larger and larger. , Recycling platinum and rhenium from waste platinum-rhenium catalyst has significant economic and social benefits. [0003] There are two main types of processes for recovering...

AI Technical Summary

Problems solved by technology

[0003] There are mainly two types of processes for recovering platinum and rhenium from spent platinum-rhenium catalysts. One is to selectively dissolve precious metals platinum and rhenium (the carrier does not dissolve). The advantage of this process is that the carrier can be reused after treatment. The disadvantage is that platinum, The recovery rate of rhenium is low; the second type is to dissolve all platinum, rhenium and alumina carriers, that is, the platinum-rhenium spent catalyst is dissolved step by step in different solvents to extract platinum and rhenium. The recovery rate of platinum and rhenium in this method is Higher, and aluminum can also be comprehensively recycled

However, the existing treatment process has disadvantages such as difficult separation of platinum and rhenium in the later stage, and low dissolution efficiency.

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