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Vacuum distillation method for separating aluminium element from mixed metals in worn-out printing circuit board

A printed circuit board and mixed metal technology, which is applied in the field of industrial waste treatment and resource utilization, can solve the problems of large consumption of chemicals, pollution of the environment by waste electrolyte, secondary pollution, etc., and achieves low cost, simple and easy method, The effect of reducing environmental pollution

Inactive Publication Date: 2006-04-19
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the main problem of existence is that the consumption of chemical agent is big, and the treatment of waste liquid will cause secondary pollution, document " present situation of domestic and foreign electronic waste and resource technology thereof " (Wei Jinxiu etc., " Journal of Donghua University " 2005 the 3rd period ) introduced the separation of mixed metals by electrolysis
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

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] First, put 5 kg of raw materials of lead-containing mixed metal powder from broken and used circuit boards into a crucible, and then put the crucible into a vacuum distillation furnace. After the vacuum distillation furnace is sealed, start the vacuum system to pump air, so that the pressure of the vacuum furnace is 1Pa. Start the melting heating body in the vacuum distillation furnace to heat the crucible, and heat the mixed metal powder in the crucible to 800°C. Then keep the temperature unchanged to evaporate the lead element in the raw material, and the evaporation time is 50 minutes. When the lead element evaporates, the condenser in the vacuum distillation furnace is heated to 350°C to condense the lead vapor, and the condensed lead droplets flow into the lead liquid recovery drip tank. 38 grams of lead were obtained. The mixed metal after distillation is continued to be purified and separated in the next step.

Embodiment 2

[0017] First, put 5 kg of raw materials of lead-containing mixed metal powder from broken and used circuit boards into a crucible, and then put the crucible into a vacuum distillation furnace. After the vacuum distillation furnace is sealed, start the vacuum system to pump air, so that the pressure of the vacuum furnace is 5 × 10 -1 Pa. Start the melting heating body in the vacuum distillation furnace to heat the crucible, and heat the mixed metal powder in the crucible to 750°C. Then, keeping the temperature unchanged, the lead element in the raw material is evaporated, and the evaporation time is 60 minutes. When the lead element evaporates, the condenser in the vacuum distillation furnace is heated to 330°C to condense the lead vapor, and the condensed lead droplets flow into the lead liquid recovery drip tank, and the obtained lead is 45 grams. The mixed metal after distillation is continued to be purified and separated in the next step.

Embodiment 3

[0019] First, put 5 kg of lead-containing mixed metal powder raw materials from broken and used circuit boards into a crucible, and then put the crucible into a vacuum distillation furnace. After the vacuum distillation furnace is sealed, start the vacuum system to pump air, so that the pressure of the vacuum furnace is 1×10 -1 Pa. Start the melting heating body in the vacuum distillation furnace to heat the crucible, and heat the mixed metal powder in the crucible to 700°C. Then, keeping the temperature unchanged, the lead element in the raw material is evaporated, and the evaporation time is 75 minutes. When the lead element evaporates, the condenser in the vacuum distillation furnace is heated to 360°C to condense the lead vapor, and the condensed lead droplets flow into the lead liquid recovery drip tank to obtain 23 grams of lead. The mixed metal after distillation is continued to be purified and separated in the next step.

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PUM

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Abstract

A process for separating the Pb from the metallic mixture generated by breaking the used or rejected PCBs by vacuum distillation method includes such steps as heating in vacuum furnace, evaporating Pb at 700-800 deg.C and condensing the Pb vapor at 330-360 deg.C. Its advantages are high effect and no pollution.

Description

technical field [0001] The invention relates to a method for vacuum distillation and separation of lead elements in mixed metals of waste and old printed circuit boards, which is a method for recycling, regenerating and recycling waste and old printed circuit boards. It belongs to the field of industrial waste treatment and resource utilization in the field of environmental protection technology. Background technique [0002] With the rapid development of the electronic information industry, a new type of solid waste - electronic waste has emerged: including various waste computers, communication equipment, TV sets, refrigerators, washing machines and electronic instruments and meters that have been eliminated by units. According to expert estimates, there are more than 28 million refrigerators, washing machines, computers, air conditioners and other electrical appliances that are scrapped each year in my country, and the total amount of waste electronic appliances reaches 1...

Claims

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Application Information

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IPC IPC(8): C22B9/02B01D1/00C22B13/00
CPCY02P10/20
Inventor 许振明郭杰李佳王永清
Owner SHANGHAI JIAO TONG UNIV
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