Method for extracting and recovering precious metal and rare metal from wastes

Abstract

The invention relates to a method for extracting and recovering precious metal and rare metal from wastes, in particular relates to a method for extracting precious metal and rare metal from wastes generated from electronic products and in the production process of the electronic products. According to the method, Comprehensive ionization equipment is adopted and different acid liquors are used for ionizing according to the chemical properties of different metals, thus realizing the continuous operation; aiming at the mixture liquor of metal ions, sectional nanofiltration membrane permeation is adopted according to the particle size difference of metal ions, and therefore the separation of metal ions with different particle sizes can be realized and the following refined purification technique can be simplified. By the method, the precious metal elements in the wastes can be extracted, the remaining waste plastic and water after extraction can both be recovered, and the resource utilization rate is high.

Description

technical field [0001] The invention relates to a method for refining and recycling precious and rare metals in waste, in particular to a method for extracting precious and rare metals from wastes produced in electronic products and their production processes, which adopts a comprehensive physical-chemical multi-process Heavy metals copper, lead, zinc, nickel, tin, cadmium, chromium and rare and precious metals gold, silver, platinum, palladium in electronic waste are ionized by acid solution, filtered and classified by differential nanofiltration, and finally obtained by reduction or electrolysis. Background technique [0002] Heavy metals are mostly non-degradable toxic substances without natural purification ability, and once they enter the environment, they are difficult to remove from the environment. At present, heavy metal pollution is quite serious, which is extremely harmful to the environment and organisms, and is easy to accumulate through the food chain, directly...

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the problems in the prior art of serious pollution, risk of toxicity, single types of recovered metals and low utilization rate, the present invention adopts physical-chemical comprehensive multiple If it is electronic solid components such as circuit boards obtained from the dismantling of electronic waste, it needs to be pretreated by two steps of mechanical crushing and granulation and acidolysis ionization. If it is sludge containing heavy metals, it needs to go through acidolysis ionization Pretreatment, and then preliminary filtration with the waste liquid containing metal ions, nanofiltration classification according to the difference in the particle size of metal ions, and finally targeted reduction or electrolytic purification to obtain heavy metals copper, lead, zinc, nickel, tin, cadmium, Chromium and high-purity rare and precious metals such as gold, silver, platinum, palladium, etc.

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