Method for recycling a plurality of metals from electronic wastes

Abstract

The invention provides a method for recycling a plurality of metals from electronic wastes. The method comprises the following steps: grinding electronic wastes, soaking the grinded electronic wastes in a nitric acid solution to dissolve the metals in the electronic wastes; processing the obtained solution by a polybipyridine functional polymer material to enrich and separate the nonferrous metals such as copper, lead, nickel, and the like; soaking the residues in hydrochloric acid and aqua regia, filtering to directly remove the plastic component; processing the obtained solution by a heteroatom-containing conductive functional polymer material or a composite material composed of the conductive functional polymer material and graphene so as to enrich and reduce the precious metal ions, and finally melting the obtained metals at a high temperature so as to obtain high-purity precious metals. Compared to the prior art, the provided method can recycle a plurality of nonferrous metals such as copper, lead, nickel, tin, and the like, and precious metals such as gold, silver, platinum, palladium, mercury, and the like in different batches in sequence, largely increases the species of recycled metals, greatly improves the recovery efficiency, and fully recovers and utilizes the electronic wastes.

Description

technical field [0001] The invention belongs to the technical field of recycling and processing of electronic waste, and in particular relates to a method for recovering various nonferrous and precious metals from electronic waste. Background technique [0002] In recent years, my country has entered the peak period of elimination of electronic products. At least 2.3 million tons of solid electronic waste including 20 million computers and 60 million mobile phones have to be scrapped every year. It is the second largest electronic waste in the world after the United States. Producing countries. Electronic waste (especially waste printed circuit boards) contains a large amount of non-ferrous metals and precious and rare metals such as gold, silver, palladium, platinum, etc., and its grade is dozens of times that of ordinary primary ores, so the recycling of electronic waste has become Today, the sunrise industry of the metal recycling industry at home and abroad contains huge...

AI Technical Summary

Problems solved by technology

The hydrometallurgical process puts the crushed electronic waste particles into acidic or alkaline liquids, and then obtains high-purity metals through a series of processes such as extraction, precipitation, replacement, ion exchange, filtration, and distillation. However, the recovery process The waste liquid, waste gas and recycled waste slag in the waste water pollute the environment more seriously

The biotechnology method mainly utilizes the adsorption of some microorganisms on the solid surface and the oxidation of microorganisms to make the active metals become soluble and enter the solution, and then expose and extract the low-content precious metals in electronic waste, which has the advantages of simple process, low cost, The advantage of convenient operation, but due to the long leaching time and low leaching rate, it is still under research and has not yet been put into use

[0004] In addition, most electronic waste contains a wide variety of metals, including various non-ferrous metals (copper, lead, nickel, tin, etc.) and precious metals (gold, silver, platinum, palladium, mercury, copper, tin, etc.) However, the current research is mostly focused on the recovery of a single or a few metals, and the green recovery of multiple metals in an orderly and orderly manner to improve the types and recovery efficiency of metals in electronic waste is still rare. to report

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