Metal and non-metal pyrogenation separation method on waste printed plate board

A printed circuit board and separation method technology, applied in the direction of solid waste removal, electronic waste recycling, recycling technology, etc., can solve the problem of failure to meet resource recovery and environmental protection, effective recycling of usable materials, and reduction of metal recycling issues such as efficiency and purity, to achieve the effect of facilitating sorting and recycling, reducing energy consumption, and overcoming metal loss

Inactive Publication Date: 2009-03-18
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, both of these two treatment processes have relatively serious environmental pollution problems. Among them, chemical hydrometallurgy also introduces pollutants such as toxic and harmful chemical solutions, and other usable materials cannot be effectively recovered, so it can no longer meet the needs of resource recovery. and environmental protection requirements; the mechanical physical treatment method is to sort the various components according to their different physical properties, but a large amount of dust containing glass fibers and resins will be produced during the mechanical crushing process, and the flame retardant contains Bromine, etc. will also emit toxic gas due to heat during the continuous crushing process, which seriously damages the environmen...

Method used

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  • Metal and non-metal pyrogenation separation method on waste printed plate board

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Experimental program
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Effect test

Embodiment 1

[0024] Put the waste printed circuit boards into the furnace of the pyrolysis device, close the furnace door and let nitrogen gas flow for 4 minutes, the nitrogen flow rate is 40 liters / min, so as to completely discharge the air in the furnace to form an anaerobic environment; The heating rate of min is to heat the material in the furnace. After the temperature rises to 700°C, keep the temperature for 25 minutes and stop the furnace. During the heating process of the material, the inlet valve is closed, and the opening of the outlet valve is adjusted. Keep 2~3mmH in the furnace 2 Slight positive pressure of O and irregular stirring of the materials; the pyrolysis products are discharged from the pyrolysis device, and the liquid and gas products are separated by the container after heat exchange with tap water at 15°C as the cooling medium. be collected.

[0025] After testing: the recovery rate of metals can reach more than 96%, and the recovery rate of available non-metals c...

Embodiment 2

[0027] Put the waste printed circuit boards into the furnace of the pyrolysis device, close the furnace door and let nitrogen gas flow for 3 minutes, the nitrogen flow rate is 50 liters per minute, so as to completely discharge the air in the furnace to form an anaerobic environment; The heating rate of min is to heat the material in the furnace. After the temperature rises to 650°C, keep the temperature for 20 minutes and stop the furnace. During the heating process of the material, the inlet valve is closed, and the opening of the outlet valve is adjusted. Keep 1.8~2.8mmH in the furnace 2Slight positive pressure of O and irregular stirring of the material; the pyrolysis product is discharged from the pyrolysis device, and the liquid and gas products are separated by the container after heat exchange with tap water at 20°C as the cooling medium. be collected.

[0028] After testing: the recovery rate of metals can reach more than 96%, and the recovery rate of non-metals can ...

Embodiment 3

[0030] Put the waste printed circuit boards into the furnace of the pyrolysis device, close the furnace door and let nitrogen gas flow for 5 minutes, the nitrogen flow rate is 30 liters per minute, so as to completely discharge the air in the furnace to form an anaerobic environment; The heating rate of min is to heat the material in the furnace. After the temperature rises to 600°C, keep the temperature for 30 minutes and stop the furnace. During the heating process of the material, the inlet valve is closed, and the opening of the outlet valve is adjusted. Keep 2.5-3.8mmH in the furnace 2 Slight positive pressure of O and irregular stirring of the materials; the pyrolysis products are discharged from the pyrolysis device, and the liquid and gas products are separated by the container after heat exchange with tap water at 25°C as the cooling medium. be collected.

[0031] After testing: the recovery rate of metals can reach more than 96%, and the recovery rate of available n...

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Abstract

The invention discloses a pyrolysis and separation method of metals and non-metals in waste printed circuit boards. The method comprises the following steps: waste printed circuit boards are placed into a furnace cavity of a pyrolysis device, after the furnace door is tightly closed, nitrogen gas is introduced; the material in the furnace cavity is heated at the heating rate of 15-20 DEG C per minute, the temperature thereof is raised to 600-700 DEG C and kept for 20-30min, then the furnace is shut down, micro-positive pressure is kept in the furnace cavity in the process of heating the material, and the material are stirred irregularly; (3) the pyrolysis product is discharged from the pyrolysis device, and a liquid product and a gaseous product are separated after the pyrolysis product exchanges heat with a cooling medium. The method can realize effective separation of the metals and non-metals in the waste PCB, and realize harmless thermal separation of solid wastes; and the method avoids environmental pollution caused by waste water, waste gas, waste liquid, and the like, produced in the treatment process of the prior art; and the recovery purity of the metals is higher.

Description

technical field [0001] The invention relates to resource recovery and recycling of waste printed circuit boards, in particular to a pyrolytic separation method for metal and nonmetal in waste printed circuit boards. Background technique [0002] With the popularization and elimination of home appliances, the number of discarded printed circuit boards (PCBs) is increasing dramatically. Due to the characteristics of high hazard, high value, and refractory disposal of waste PCBs, more and more attention has been paid to the harmless and resourceful treatment of waste PCBs. [0003] At present, the processing methods for waste printed circuit boards at home and abroad mainly include pyrometallurgy, chemical hydrometallurgy, mechanical physical method and incineration method. The main goal of pyrometallurgy and chemical hydrometallurgy is to recover precious metals such as platinum, palladium, gold, silver, lead, and copper. However, both of these two treatment processes have r...

Claims

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Application Information

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IPC IPC(8): B09B3/00
CPCY02W30/82
Inventor 马洪亭张于峰邓娜
Owner TIANJIN UNIV
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