Process for recovering non-ferrous metal and noble metal from electronic waste material

Abstract

A method for reclaiming nonferrous metals and noble metals in electronic scrap belongs to the technical field of resourceful disposal for industrial waste. The method comprises the following steps: the electronic scrap is crushed and separated to get mixed metal powder containing Pt, Pd, Au, Ag, Ni, Cu, Sb, Zn, Pb and Sn; the powder is fused in two steps; after each step, the fused material is collected by vacuum press-filtering; then the fused material is separated by vacuum distillation separation method to obtain the Sb, Zn, Pb and Sn; the Cu and Ni are extracted by electrolysis; the Au, Ag, Pt and Pd are extracted by hydrometallurgy. The method has the advantages of more through separation and collection, complete recovery of various metals in the electronic scrap, low cost, low energy consumption and high efficiency.

Description

Technical field [0001] The invention relates to a method for recycling and separating electronic waste. It belongs to the technical field of industrial waste resource treatment. Background technique [0002] Experts estimate that the total amount of discarded electronic appliances in my country is 1 million tons per year, of which 4% are waste printed circuit boards; and about 6 million computers are scrapped, including about 3,500 tons of computer boards. According to statistics, there are about 272Kg plastic, 130Kg copper (Cu), 41Kg iron (Fe), 29Kg lead (Pb), 20Kg tin Sn, 18Kg nickel (Ni), 10Kg antimony (Sb), 9Kg silver (Ag), 0.45Kg gold (Au), platinum (Pt), palladium (Pd) and other precious metals. How to recover these metals from waste printed circuit boards, Chinese invention patent 02121434.4 discloses a "process for recovering metal and non-metallic materials from copper-rich electronic waste", which roughly crushes and pulverizes electronic waste. Water is used as the med...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that only the metals such as Cu, Pt, Pd, Au, and Ag are recovered, and the metals such as Ni, Sb, Pb, Zn, and Sn contained in the computer board are not recovered.

Moreover, one-time use of a converter to melt and cast the electrode will cause the metal at the low melting point to melt at a high temperature, resulting in high energy consumption and high cost.

[0003] In addition, the "precious metal recycling method for electronic waste" disclosed in Chinese invention patent 03137220.3 can only regenerate precious metals in electronic waste, and there is also the problem of incomplete resource recovery.

And the discarded supernatant and leaching process have secondary pollution to the environment

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