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Method for reclaiming and treating electronic waste

A technology for electronic waste and recycling, which is applied in the direction of electronic waste recycling, solid waste removal, recycling technology, etc., to achieve the effects of improving energy utilization, direct and efficient use of microwave energy, and low energy consumption

Inactive Publication Date: 2011-05-25
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] So far, there is no patent report on the use of direct pyrolysis characterized by the coupling effect of microwave overall heating and corona discharge combined with physical and mechanical methods to separate and recover pyrolysis residues to achieve comprehensive recycling of electronic waste

Method used

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  • Method for reclaiming and treating electronic waste
  • Method for reclaiming and treating electronic waste
  • Method for reclaiming and treating electronic waste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The waste computer main board is broken to less than 3cm×3cm and placed in the quartz reaction container 4 in the center of the microwave heating furnace 3, and sealed by a tetrafluoroethylene flange. Connected to each other, pass nitrogen for 30 minutes to make the air in the reactor as clean as possible, set the microwave power to 500W-700W, and the irradiation time to be 10-30min, so that the electronic waste undergoes thermal decomposition reaction, and the volatile matter is condensed by the condensing device 5 and enter The scrubber 6 equipped with NaOH solution is finally collected by the gas collection bag 7 to obtain gas, liquid and solid products respectively, and their yields are shown in Table 1. The composition of the analyzed gas is shown in Table 2, the composition of the oil product after treatment is shown in Table 3, the composition of the solid product is shown in Table 4, and the form is as follows image 3 shown.

[0024] Table 1 The yield of micro...

Embodiment 2

[0033] The solid product obtained in Example 1 was crushed with a high-speed rotating crushing device, the blade speed was 20000r / min, the glass fiber-reinforced matrix material was crushed, and the glass fiber cloth was crushed into fibers. Ensure that the conversion rate of glass fiber cloth broken into glass fiber reaches more than 95%.

[0034] The separation of metal and non-metal adopts the aforementioned cyclone flotation separation process. The metal recovery rate is above 98%, and the metal component content in the recovered metal mixture is over 91%, while the glass fiber recovery rate is high, the purity is good, and the fiber characteristics are good. The main composition of the recovered metal mixture is shown in Table 5.

[0035] Table 5 Main composition of recovered metal mixture

[0036] Cu

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Abstract

The invention relates to a method for reclaiming and treating electronic waste, which comprises the steps of crushing, sealing, nitrogen introduction, microwave radiation, separation and the like, wherein the microwave radiation is directly adopted for pyrolysis, and in the separation, solid residues are subjected to a mechanical crushing-physical separation process. The conventional external heating mode is replaced by adopting an 'internal heating' mode of coupling microwave heating and corona discharge, the corona discharge is excited by the microwave radiation, and the defect of low efficiency in conventional external heating due to the factors such as large material size, more pores, low heat conducting efficient and the like is overcome at the same time of promoting microwave heating by the discharge heat; therefore, the pyrolysis process is quickened, the utilization rate of energy is greatly improved, the metals in pyrolysis residues are separated and reclaimed by adopting a mechanical mode rather than a metallurgical mode, the energy consumption is relatively low, meanwhile, high temperature is avoided, and release of toxic or harmful substances is effectively suppressed.

Description

technical field [0001] The invention relates to a treatment of electronic waste, in particular to a method for recycling and processing of electronic waste. Background technique [0002] In recent years, with the rapid upgrading or elimination of various electronic products and electrical appliances, the amount of electronic waste in the world has increased alarmingly, and the current annual production has reached 20,000,000 to 50,000,000 tons, which has become a major problem that plagues the global environment. The coexistence of resources and pollution is a characteristic of electronic waste. It is mainly composed of metals, ceramics, glass, plastics, etc., especially containing a certain amount of precious metals. There are many recyclable components, but if not handled properly, the heavy metals inside , polymers, etc. are extremely likely to cause environmental pollution. Some areas in southern my country have used relatively elementary means to dispose and recycle a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00B09B5/00C10B53/00C10B57/00
CPCY02W30/82
Inventor 王文龙孙静马春元刘振董勇
Owner SHANDONG UNIV
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