Unlock instant, AI-driven research and patent intelligence for your innovation.

Separation and recovery method of mixed metal-enriched body after shredding and sorting electronic waste

A technology of electronic waste and mixed metals, which is applied in the field of metal recycling and harmless treatment, can solve the problems of waste electrolyte pollution and other problems, and achieve the effects of less process flow, improved recovery rate and purity, and simple operation

Inactive Publication Date: 2016-05-18
SHANGHAI JIAOTONG UNIV
View PDF9 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, harmful gases such as hydrogen fluoride, carbon monoxide, and sulfur dioxide are produced during the electrolysis process, and waste electrolyte seriously pollutes the environment.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Separation and recovery method of mixed metal-enriched body after shredding and sorting electronic waste
  • Separation and recovery method of mixed metal-enriched body after shredding and sorting electronic waste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Firstly, the mixed metal enrichment bodies such as copper, lead, cadmium and zinc after electronic waste crushing and sorting are put into the pyrolysis equipment. Under nitrogen condition, heat to 550°C for pyrolysis treatment. The heating time lasted for 35 minutes, and the condensed pyrolysis oil and non-condensable pyrolysis gas were collected. The pyrolyzed mixed metals and residual carbon are taken out and put into a vacuum continuous separation and recovery device. Keep the pressure of the vacuum furnace at 1 Pa, then heat the device to 600°C and keep it warm for 1 hour. The cadmium is condensed on the condensation tray, the recovery rate is 95%, and the purity is 99%, thereby separating the cadmium from the mixed metal. Replace the condensing pan, and continue to heat the device to 700°C, then keep the temperature constant to evaporate the zinc in the mixed metal, and the evaporation time is 1 hour. Zinc condenses on the condensation pan with a recovery rate o...

Embodiment 2

[0048] Firstly, the mixed metal enrichment bodies such as copper, lead, cadmium and zinc after electronic waste crushing and sorting are put into the pyrolysis equipment. Under vacuum conditions, the air pressure is kept at 50Pa, heated to 250°C for pyrolysis treatment. The heating time lasted for 40 minutes, and the condensed pyrolysis oil and non-condensable pyrolysis gas were collected. The pyrolyzed mixed metals and residual carbon are taken out and put into a vacuum continuous separation and recovery device. Keep the pressure of the vacuum furnace at 0.1Pa, then heat the device to 650°C and keep it warm for 1 hour. The cadmium will condense on the condensation plate, the recovery rate is over 96%, and the purity is 99%, thereby separating cadmium from mixed metals. Replace the condensation pan, and continue to heat the device to 750°C, then keep the temperature constant to evaporate the zinc in the mixed metal, and the evaporation time is 1 hour. Zinc condenses on the c...

Embodiment 3

[0050] Firstly, the mixed metal enrichment bodies such as copper, lead, cadmium and zinc after electronic waste crushing and sorting are put into the pyrolysis equipment. Under nitrogen condition, heat to 600°C for pyrolysis treatment. The heating time lasted for 30 minutes, and the condensed pyrolysis oil and non-condensable pyrolysis gas were collected. The pyrolyzed mixed metals and residual carbon are taken out and put into a vacuum continuous separation and recovery device. Keep the pressure of the vacuum furnace at 0.01Pa, then heat the device to 680°C and keep it warm for 2 hours. The cadmium condenses on the condensing plate, with a recovery rate of over 97% and a purity of 99%, thereby separating cadmium from mixed metals. Replace the condensing pan, and continue to heat the device to 780°C, then keep the temperature constant to evaporate the zinc in the mixed metal, and the evaporation time is 2 hours. The zinc condenses on the condensation pan with a recovery rate...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a method for separating and recovering a mixed metal concentrate obtained after an electronic waste is crushed and separated. The method comprises the following steps of: (1) adding the mixed metal concentrate obtained after the electronic waste is crushed and separated to a pyrolyzing furnace, and carrying out pyrolysis treatment on the mixed metal concentrate under the condition of nitrogen introduction or vacuumizing; (2) adding a mixed metal and carbon residues which are obtained through pyrolysis to a vacuum continuous-separation recovery device together for vacuum distillation and condensation collection treatment, and directly casting the rest of liquid metal copper into a copper ingot product at high temperature. The method disclosed by the invention has the characteristics of few process flow, easiness for operation, high efficiency and no pollution, does not discharge any harmful waste water and waste gas to the environment in an integral treatment process, ensures that the metal condensing equipment is not disturbed by pyrolysis oil by removing organic components contained in the mixed metal by utilizing nitrogen pyrolysis or vacuum pyrolysis, prolongs the service life of metal distillation equipment, reduces the maintenance cost, enhances the metal purity and enhances the recovery rate during metal distillation.

Description

technical field [0001] The invention relates to the technical field of metal recovery and harmless treatment in electronic waste, in particular to a method for separating and recycling mixed metal enriched bodies such as copper, lead, cadmium and zinc after electronic waste is crushed and sorted. Background technique [0002] With the continuous development of electronic information technology, electronic products have penetrated into all aspects of people's production and life. As a short-life cycle product, the number of scrapped electronic products has also increased exponentially in recent years. It is estimated that there are more than 50 million household appliances such as refrigerators, washing machines, and air conditioners scrapped every year in my country, with an average annual growth rate of 20%. . [0003] In electronic waste, the metal content is as high as about 60%, while in nature, the metal content reaches 3-5%, which can be called a rich ore. The metal c...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00
Inventor 许振明马恩方文熊
Owner SHANGHAI JIAOTONG UNIV