Method for collecting and recycling platinum group metal in waste catalyst by pyrogenic process

Abstract

The invention discloses a method for capturing and recycling platinum group metal in a waste catalyst by a pyrogenic process, which comprises the following steps: preparing a platinum group metal capturing agent from copper and manganese according to an element molar ratio of 1: (0.3-1.5), and uniformly mixing the waste catalyst, the capturing agent, a slagging flux and a reducing agent according to a set proportion; smelting the uniformly mixed materials at the temperature of 1100-1300 DEG C, reacting for a preset time, floating slag on the surface of an alloy phase, and carrying out solid-liquid separation to obtain a copper-manganese alloy phase containing the platinum group metal; and recovering the obtained copper-manganese alloy phase containing the platinum group metal to obtain the platinum group metal. According to the method of the invention, multi-metal synergistic trapping is utilized, the recovery rate of the platinum group metal is high, copper and manganese can form low-melting-point alloy with the melting temperature lower than 1000 DEG C, and the melting temperature is reduced. The method has the advantages of low energy consumption, low cost, high recovery rate and the like, and is beneficial to industrial application.

Description

technical field [0001] The invention belongs to the field of recovery of platinum group metals, and relates to a method for collecting and recovering platinum group metals in spent catalysts by pyrotechnics. Background technique [0002] Platinum group metals have excellent physical and chemical properties such as high stability, high temperature resistance and good catalytic activity, and are widely used in automobiles, petroleum, chemical industry, aerospace and other fields. However, the reserves of platinum group metals in my country are small, the consumption is large, the dependence on foreign countries is high, and the contradiction between supply and demand is very prominent. How to efficiently recover platinum group metals from spent catalysts is a key technology that needs to be solved urgently. [0003] Currently, recovery methods for spent catalyst platinum group metals include wet method and pyrolysis method, among which wet dissolution is the main method, that...

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Problems solved by technology

[0009] Aiming at the waste catalyst recovery platinum group metal wet method in the prior art, there is a large consumption of reagents, difficult wastewater treatment, heavy metal pollution in the nickel-lead capture method in pyromelting, high temperature and high energy consumption in the high-temperature iron capture method Technical problem, the purpose of the present invention is to provide a method for capturing and recovering platinum group metals in spent catalysts by means of pyrotechnics, using the metal capture method to realize the method of recovering platinum group metals in spent catalysts at a lower temperature, reducing the difficulty of smelting operations and energy consumption, to achieve green, low cost, less slag and high recovery rate of platinum group metals

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