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Method for selectively leaching and separating tin, lead and copper from waste circuit board

A waste circuit board, selective technology, applied in the direction of process efficiency improvement, etc., can solve the problems of high energy consumption, high equipment requirements, high processing costs, etc., and achieve the effect of saving operating costs and saving separation operations

Inactive Publication Date: 2010-10-20
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent CN101225476A uses sulfuric acid to leaching copper under high temperature and high pressure oxidation, and the lead remains in the slag in the form of lead sulfate. This method requires high temperature and high pressure, high requirements on equipment, and high processing costs
Chinese patent CN1072218A uses molten salt containing sodium chloride and potassium chloride to soak at high temperature to remove lead and tin on the copper surface to separate copper, lead and tin. This method requires high temperature and has high requirements on the material and design of the equipment. , so the equipment investment is large, the processing cost is high, and the tin and lead are not completely separated
Chinese patent CN1093756A uses a submerged arc furnace to reduce and smelt copper smelting waste slag at high temperature to produce an alloy of tin, lead, and copper. After oxidation roasting and selective sulfuric acid leaching, tin dioxide, lead sulfate mixed slag and copper sulfate solution are produced. The method not only needs to be oxidized and roasted, but consumes a lot of energy, and tin and lead cannot be separated

Method used

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  • Method for selectively leaching and separating tin, lead and copper from waste circuit board

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Effect test

Embodiment 1

[0021] 1) Use waste circuit boards with an average particle size of 0.5mm and containing copper (5000mg / kg), tin (1000mg / kg) and lead (1000mg / kg) as raw materials, and use 0.5mol / L hydrochloric acid as the leaching agent to extract The temperature is 50°C, the leaching rate is 10 minutes, the leaching rate of copper is less than 0.06%, the leaching rate of tin is more than 91%, and the leaching rate of lead is less than 1%.

[0022] 2) Using hydrochloric acid leaching residue as raw material, using 0.005mol / L copper chloride as leaching agent, leaching temperature is 45°C, leaching for 300 minutes, lead leaching rate > 97%.

Embodiment 2

[0024] 1) Use waste circuit boards with an average particle size of 50mm and containing copper (70000mg / kg), tin (8000mg / kg) and lead (20000mg / kg) as raw materials, use 2.0mol / L hydrochloric acid as the leaching agent, and the leaching temperature leaching for 30 minutes at 35°C, copper leaching rate 93%, lead leaching rate < 0.4%.

[0025] 2) Using hydrochloric acid leaching residue as raw material, using 0.03mol / L copper chloride as leaching agent, leaching temperature is 50°C, leaching for 60 minutes, lead leaching rate > 97%.

Embodiment 3

[0027] 1) Use waste circuit boards with an average particle size of 100mm, containing copper (100000mg / kg), tin (12000mg / kg) and lead (10000mg / kg) as raw materials, use 2.5mol / L hydrochloric acid as the leaching agent, and the leaching temperature leaching for 300 minutes at 15°C, copper leaching rate 98%, lead leaching rate < 1.2%.

[0028] 2) Using hydrochloric acid leaching residue as raw material, using 0.05mol / L copper chloride as leaching agent, leaching temperature is 40°C, leaching for 10 minutes, lead leaching rate > 96%.

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Abstract

The invention discloses a method for selectively leaching and separating tin, lead and copper from a waste circuit board, which is characterized by comprising the following steps of: mixing and stirring particles of the waste circuit board and a leaching agent hydrochloric acid for a certain time at a certain temperature, and selectively dissolving the tin into the solution; and mixing and stirring residues and another leaching agent copper chloride for a certain time, selectively dissolving the lead into the solution, and keeping the residual copper in the circuit board. The technical process has the advantages of simplicity, no need of high temperature and high pressure, the capacity of effectively separating the tin, the lead and the copper from the waste circuit board and saving subsequent separation operation, no other introduced impurities and running cost saving.

Description

technical field [0001] The invention belongs to the field of metal recycling of waste electronic circuit boards, in particular to a method for selectively leaching and separating tin, lead and copper in waste circuit boards. Background technique [0002] With the increasing demand for electronic products in people's daily life, people pay more and more attention to the impact of waste electronic products on the environment and their recycling value. Generally speaking, discarded circuit boards (hereinafter referred to as PCBs) are composed of electronic components and epoxy resin and are regarded as secondary resources. PCBs contain about 28% of valuable metals including copper, aluminum, tin, etc., and the purity of valuable metals is 10 times higher than that of corresponding concentrates. Therefore, recycling PCBs can not only reduce environmental pollution, but also recover valuable metals. [0003] Currently, there are various methods based on pyro-refining or hydrome...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B3/10C22B15/00C22B25/06C22B13/00
CPCY02P10/20
Inventor 曹宏斌张小娟李鑫钢林晓张懿
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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