Method for processing waste circuit board

A technology of waste circuit boards and treatment methods, which is applied in the field of waste circuit boards, can solve the problems of complex equipment, low metal recovery rate, and low purity, and achieve the effects of high recovery rate, high purity, and simple processing equipment

Active Publication Date: 2014-09-10
SINOPEC SHANGHAI ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is that the prior art has the problems of low metal recovery rate, low purity and complex equipment, and provides a new method for processing waste circuit boards.

Method used

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  • Method for processing waste circuit board

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Effect test

Embodiment 1

[0033] A processing method for processing waste circuit boards, the steps are as follows:

[0034] Plastic carbonization. The waste circuit board is heated to 600°C in a heating furnace, and the atmosphere in the heating furnace is an inert atmosphere of carbon dioxide. Burn time 2 hours.

[0035] Ball milling separates plastics and metals. Put the burnt circuit board into a ball mill for ball milling, the ratio of ball to material is 1:1, and the ball milling time is 2 hours. The material after ball milling is separated from plastic powder and metal by sieving machine. The plastic content in metal has been reduced from 30% to 2.5%.

[0036] Alkali roasting. The metal after the separation of plastics is mixed with NaOH and then roasted with alkali in a rotary kiln. The roasting temperature is 400°C and the roasting time is 2 hours. The amount of alkali added is 1.4 times the amount of tin, antimony and lead in the metal. The calcined material is ground and then soaked in...

Embodiment 2

[0041] A processing method for processing waste circuit boards, the steps are as follows:

[0042]Plastic carbonization. The waste circuit board was heated to 550° C. in a heating furnace, and the atmosphere in the heating furnace was nitrogen inert atmosphere. Burn time 2 hours.

[0043] Ball milling separates plastics and metals. Put the burnt circuit board into a ball mill for ball milling, the ball-to-material ratio is 1:2, and the ball milling time is 3 hours. The material after ball milling is separated from plastic powder and metal by sieving machine. The plastic content in metal has been reduced from 30% to 1.5%.

[0044] Alkali roasting. The metal after the plastic separation is mixed with NaOH and then roasted with alkali in a rotary kiln. The roasting temperature is 350°C and the roasting time is 2 hours. The amount of alkali added is 1.5 times the amount of tin, antimony and lead in the metal. The calcined material is ground and then soaked in water at a temp...

Embodiment 3

[0049] A processing method for processing waste circuit boards, the steps are as follows:

[0050] Plastic carbonization. The waste circuit board is heated to 600° C. in a heating furnace, and the atmosphere in the heating furnace is a vacuum atmosphere. Burn time 3 hours.

[0051] Ball milling separates plastics and metals. Put the burnt circuit board into a ball mill for ball milling, the ball-to-material ratio is 1:2, and the ball milling time is 3 hours. The material after ball milling is separated from plastic powder and metal by sieving machine. Plastic content in metal reduced from 30% to 3%.

[0052] Alkali roasting. The metal after the plastic separation is mixed with NaOH and then roasted with alkali in a rotary kiln. The roasting temperature is 450°C and the roasting time is 2 hours. The amount of alkali added is 1.5 times the amount of tin, antimony and lead in the metal. The calcined material is ground and then soaked in water at a temperature of 90° C. and ...

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Abstract

The invention relates to a method for processing a waste circuit board, which solves the problems of low metal recovery rate, low purity and complex equipment in prior art. The method comprises the following steps: heating the circuit board, carbonizing the plastic in the circuit board under vacuum environment or inert atmosphere; then performing ball milling in a bowl mill, sorting the material through ball milling, and separating metal and plastic, then adding alkali in metal for roasting, then performing water leaching for leaching metals such as tin, antimony and lead, electrorefining to obtain copper, and recovering precious metal by anode mud; the steps better solve the problems. The method provided in the invention is used for industrial production for processing the waste circuit board.

Description

technical field [0001] The invention relates to a method for processing electronic waste, in particular to a method for processing waste circuit boards. Background technique [0002] Waste circuit boards are a mixture of glass fibers, reinforced resins, and various metals, and are typical electronic waste. Ordinary circuit boards contain a large number of toxic and harmful chemical substances to the human body. The following are the chemical components of circuit boards in computers: [0003] [0004] The main components of circuit boards are plastic, copper, iron and aluminum. The ones with economic value are copper, tin, precious metals, etc. Processing circuit boards can not only reduce the damage of heavy metals in circuit boards to the environment, but also recover copper, precious metals, tin, etc., and generate economic value. Recycling waste circuit boards is of great significance. [0005] There are many treatment processes for waste circuit boards, and the t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00C22B7/00
CPCY02P10/20Y02W30/82
Inventor 杜军
Owner SINOPEC SHANGHAI ENG
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