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

A technology of electronic waste and non-ferrous metals, which is applied in the field of industrial waste resource treatment, can solve the problems of incomplete resource recovery, environmental secondary pollution, and failure to recycle, and achieve good environmental friendliness, energy saving, and good economic benefits Effect

Inactive Publication Date: 2008-11-26
董蜀希 +1
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  • Abstract
  • Description
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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

Method used

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

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Embodiment Construction

[0009] As shown in Figure 1, the electronic waste powder is re-selected and magnetically separated according to the conventional method to remove the Fe in the mixed metal powder to obtain Pt, Pd, Au, Ag, Ni, Cu, Sb, Zn, Pb, Sn Add the mixed metal powder to the melting pool of the electric melting furnace, turn on the induction heating coil, control the temperature in the melting pool to 900 ℃ and heat for 2 hours, and heat the Pb, Sn, Zn whose melting point is less than 630 ℃ , After Sb is fully melted into a liquid state, turn on the vacuum pump and keep the pressure in the liquid metal collector below the melting pool at 90 Pa, so that the molten lead Pb, tin Sn, zinc Zn, and antimony Sb are passed through with nickel The filter screen made of silk cloth enters the liquid metal collector and then is sent to the vacuum distillation separation furnace. The metal element has the characteristics of different vapor pressures at different temperatures and pressures and different cond...

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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...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B9/02C25C1/08C25C1/12C22B3/00C22B11/00
CPCY02P10/20
Inventor 董蜀希
Owner 董蜀希
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