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Method for harmlessly and deeply treating waste circuit boards and recycling metals

A technology for waste circuit boards and advanced treatment, which is applied to the improvement of process efficiency, photography technology, instruments, etc., can solve the difficulties in the recycling and processing of waste circuit boards, the inability to realize industrial production of waste circuit boards, and the absence of key technologies in the main process Solve and other problems, to achieve the effect of reducing mineral mining, good social and economic benefits, and improving the production environment

Pending Publication Date: 2016-07-27
HENAN GONGXIN ENVIRONMENTAL PROTECTION & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, due to the complex composition of waste circuit boards, various precious metals in the boards exist in the form of compounds, and the content is also very low. In addition, the key technology of the main process has not been solved, and the entire recycling process of waste circuit boards cannot be achieved continuously. Large-scale industrial production makes it difficult to recycle waste circuit boards

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The method for the harmless advanced treatment of waste circuit boards to recycle metal in this embodiment includes the following steps:

[0045] (1) One-step leaching and separation of copper and tin: the waste circuit boards are crushed and screened to obtain metal powder; the metal powder is added to sulfuric acid with a concentration of 180g / L, and a stage of leaching is carried out under the conditions of heating and aeration, and the liquid-solid ratio is 5:1, leaching temperature 90°C, leaching time 2h, copper and tin enter the leaching solution, Cu in the leaching solution 2+ The content is 40-50g / L, and part of the tin is suspended in the leachate in the form of tin dioxide; a stage of leachate and a stage of leach residue are obtained through primary filtration;

[0046] Use hydrogen peroxide and sulfuric acid to carry out the second-stage leaching of the first-stage leaching residue. Under the condition of heating and stirring, the liquid-solid ratio is 2:1, ...

Embodiment 2

[0073] The method for the harmless advanced treatment of waste circuit boards to recycle metal in this embodiment includes the following steps:

[0074] (1) One-step leaching and separation of copper and tin: the waste circuit boards are crushed and screened to obtain metal powder; the metal powder is added to sulfuric acid with a concentration of 250g / L, and a stage of leaching is carried out under the conditions of heating and aeration, and the liquid-solid ratio is 5:1, leaching temperature 90°C, leaching time 2h, copper and tin enter the leaching solution, Cu in the leaching solution 2+ The content is 40-50g / L, and part of the tin is suspended in the leachate in the form of tin dioxide; a stage of leachate and a stage of leach residue are obtained through primary filtration;

[0075] Use hydrogen peroxide and sulfuric acid to carry out the second-stage leaching of the first-stage leaching residue. Under the condition of heating and stirring, the liquid-solid ratio is 4:1, ...

Embodiment 3

[0102] The method for the harmless advanced treatment of waste circuit boards to recycle metal in this embodiment includes the following steps:

[0103] (1) One-step leaching and separation of copper and tin: the waste circuit boards are crushed and screened to obtain metal powder; the metal powder is added to sulfuric acid with a concentration of 200g / L, and a stage of leaching is carried out under the conditions of heating and aeration, and the liquid-solid ratio is 3:1, leaching temperature 90°C, leaching time 2h, copper and tin enter the leaching solution, Cu in the leaching solution 2+ The content is 40-50g / L, and part of the tin is suspended in the leachate in the form of tin dioxide; a stage of leachate and a stage of leach residue are obtained through primary filtration;

[0104] Use hydrogen peroxide and sulfuric acid to carry out the second-stage leaching of the first-stage leaching residue. Under the condition of heating and stirring, the liquid-solid ratio is 3:1, ...

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Abstract

The invention discloses a method for harmlessly and deeply treating waste circuit boards and recycling metals, and belongs to the technical field of wet metallurgy. The method comprises the following process steps: (1) low-temperature pulverizing and electrostatic separation, (2) sulfuric acid leaching and extracting, (3) liquid cleaning, (4) direct electrodeposition of copper in a jet flow state, (5) liquid purifying and gathering after electrodeposition, and (6) precious metal extraction, wherein the precious metal extraction is divided into gold extraction, palladium extraction and silver extraction. By the method, a technological process is simplified, various advanced technologies including direct electrodeposition in the jet flow state, continuous ion exchange and the like and various kinds of advanced equipment are combined, metals in raw materials are comprehensively recycled, meanwhile, the production environment of a workshop is improved, energy is saved, and emission is reduced. The whole process is simple and reasonable in operation, and running costs are reduced.

Description

technical field [0001] The invention relates to a method for harmless advanced treatment of waste circuit boards to recover metal, and belongs to the technical field of hydrometallurgy. Background technique [0002] Printed circuit boards are the basic materials of the electronics industry. In the era of the electronics industry, the annual output of waste circuit boards at home and abroad reaches 500,000 tons per year. The waste circuit boards contain lead, chromium, cadmium, mercury and other heavy metals that cause great harm to the environment. In addition, there are also halogen-containing elements. Hazardous substances such as flame retardants, if waste circuit boards are not properly disposed of, will cause great harm to the environment. Waste circuit boards are defined as hazardous waste in the National Hazardous Waste Catalog, and the code is HW-49. [0003] At present, due to the complex composition of waste circuit boards, various precious metals in the boards e...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B15/00C25C1/12C22B25/06C22B11/00C25C1/20
CPCC22B7/007C22B11/046C22B15/0071C22B25/04C22B25/06C25C1/12C25C1/20Y02P10/20
Inventor 邱建宁仼常景
Owner HENAN GONGXIN ENVIRONMENTAL PROTECTION & TECH CO LTD
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