Recycling method for valuable metal in electronic waste

A technology for recycling and processing electronic waste, applied in the field of resources and the environment, can solve problems such as increased separation of precious metals, difficulty in purification, complex alloy phase composition, and limitations in process applicability, so as to improve processing capacity and raw material adaptability, and reduce energy consumption Effect

Active Publication Date: 2016-02-24
CHANGSHA RES INST OF MINING & METALLURGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method has the ability to recycle precious metals in waste mobile phone circuit boards and waste automobile catalysts at the same time, it also has the following problems: (1) The smelting process needs to add waste mobile phone circuit boards and waste automobile catalysts at the same time, which cannot be recycled separately Electronic waste with huge output and reserves (such as waste mobile phone circuit boards) has limited process applicability; (2) Although wast...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A method for recycling and processing valuable metals in electronic waste of the present invention, comprising the following steps:

[0026] Electronic waste (Cu20%, Sn4%, Fe8%, Au1000g / t, Ag2000g / t, Pd5g / t, Al2%, Al 2 o 3 6%; SiO 2 15%) mixed with a slagging agent to obtain a mixed material. Among them, the electronic waste is composed of dismantled and broken waste computers, circuit boards and waste cameras, etc., and the slagging agent is composed of copper smelting slag (Cu1wt%, TFe42wt%, SiO 230%, CaO5%) and limestone (CaO99%); in the aforementioned mixture, CaO / SiO 2 =0.55, the quality of electronic waste accounts for 70%;

[0027] Put the above mixed material into the smelting furnace for smelting, control the smelting temperature at 1350°C, and smelting time for 30 minutes, and smelt and produce Cu-Sn alloy and CaO-SiO 2 -Al 2 o 3 -FeO quaternary slag, CaO / SiO in slag 2 =0.48; the copper slag provides SiO for slag making during the smelting process 2 an...

Embodiment 2

[0030] A method for recycling and processing valuable metals in electronic waste of the present invention, comprising the following steps:

[0031] Electronic waste (Cu35%, Sn6%, Fe8%, Au5g / t, Ag415g / t, Pt500g / t, Al15%, SiO 2 8wt%) and a slagging agent to obtain a mixed material, in which the electronic waste is composed of simply broken waste mobile phones, circuit boards and scrap copper materials, and the slagging agent is composed of copper smelting slag (Cu0.69wt%, TFe42wt%, SiO 2 30%, CaO5%, limestone (CaO90%) and silica (SiO 2 98%) mixed, in the mixed material, CaO / SiO 2 =0.71, the mass of electronic waste accounts for 55%;

[0032] Put the above mixed material into the melting furnace for high-temperature melting, and feed an appropriate amount of oxygen into the melting furnace, control the melting temperature to 1400 °C, and the melting time is 25 minutes to produce Cu-Sn alloy and CaO-SiO 2 -Al 2 o 3 -FeO quaternary slag, in which slag CaO / SiO 2 =0.69;

[003...

Embodiment 3

[0035] A method for recycling and processing valuable metals in electronic waste of the present invention, comprising the following steps:

[0036] Electronic waste (Cu55%, Sn8%, Fe12%, Au5g / t, Ag415g / t, Pt500g / t, Al15%, SiO 2 8wt%) and a slagging agent to obtain a mixed material, in which electronic waste is composed of discarded circuit boards and metal wires after simple crushing and sorting, and the slagging agent is composed of limestone (CaO90%) and silica (SiO 2 98%) composition, CaO / SiO in mixed materials 2 =1.15, the quality of electronic waste accounts for 40%;

[0037] Put the above mixed material into the melting furnace for melting, and feed an appropriate amount of oxygen into the melting furnace, control the melting temperature at 1450°C, and the melting time for 15 minutes to produce Cu-Sn alloy and CaO-SiO 2 -Al 2 o 3 Ternary system slag;

[0038] The contents of Cu, Sn and Fe in the smelting output alloy were 81.30%, 4.34% and 7.68%, respectively, and th...

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PUM

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Abstract

A recycling method for valuable metal in electronic waste includes the following steps that the electronic waste and a slag former are mixed to obtain a mixed material, wherein the electronic waste accounts for at least 10% of the mass of the mixed material; the mixed material is put into a smelting furnace for high-temperature smelting, wherein the smelting temperature is controlled to range from 1300 DEG C to 1450 DEG C, and the smelting time is longer than 10 min; and an oxidizing agent is added into the furnace in the high-temperature smelting process, and Cu-Sn alloy and furnace slag containing CaO and SiO2 are generated through smelting, wherein Fe accounts for less than 15% of the Cu-Sn alloy, and the CaO or SiO2 accounts for more than 0.25% of the furnace slag. The recycling method has the beneficial effects that the technological operation is simple, the waste is sufficiently utilized, the valuable metal recycling rate is high, energy consumption and cost are low, and the economic and environmental benefits are good.

Description

technical field [0001] The invention relates to the technical field of resources and the environment, in particular to a method for recovering valuable metals from waste materials, the valuable metals particularly including copper, tin, gold, silver and the like. Background technique [0002] In recent years, the frequent replacement of products in the electronics and information industries has resulted in the generation of a large amount of electronic waste, especially the number of discarded printed circuit boards, which is increasing year by year at an astonishing rate. Printed circuit boards are the foundation of the electronics industry and an indispensable and important part of various electronic products. Printed circuit boards are mainly composed of organic reinforced resin, glass fiber, copper foil and electronic components, which contain a large amount of valuable metals (such as copper, tin, iron, aluminum, lead, etc.), and also contain precious metals (such as go...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B15/00C22B25/06C22B11/00
CPCC22B7/001C22B11/00C22B15/0028C22B25/06Y02P10/20
Inventor 肖松文任国兴潘炳王鹏
Owner CHANGSHA RES INST OF MINING & METALLURGY
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