Low-carbon and efficient waste circuit board total reclamation cleaning recycling method

Abstract

The invention discloses a low-carbon and efficient waste circuit board total reclamation cleaning recycling method. According to the method, a waste circuit board is arranged in a pyrolyzing furnace, the pyrolyzing furnace is inflated with oxygen and fuel gas to conduct oxygen debt insufficient combustion, a heat source and atmosphere are provided for pyrolysis of the waste circuit board, the temperature in the pyrolyzing furnace is controlled to be continuously increased, soldering tin is recycled in a liquid state form, pyrolysis residues are enriched at the furnace bottom, and pyrolysis gas is recycled from the furnace top; and after pyrolytic oil is recycled through the pyrolysis gas via condensation, condensated waste gas is washed through alkali liquor and then serves as fuel gas to return to the pyrolyzing furnace. According to the method, operation is simple, energy consumption is low, and low-carbon and efficient waste circuit board total reclamation cleaning recycling and utilizing can be achieved.

Description

technical field [0001] The invention relates to a resource recovery method of waste circuit boards, in particular to a low-carbon and high-efficiency full resource recovery method of waste circuit boards, which belongs to the field of resource recovery and reuse of waste electronic and electrical products. Background technique [0002] With the continuous development of the global economy, the pressure on resources and energy is increasing, and economic transformation and industrial restructuring are becoming more and more urgent. At present, in the era of rapid development of the electronic information industry, the upgrading of electronic information products is accelerating, resulting in a large amount of electronic waste. Waste circuit boards are an important part of electronic waste, and its low-carbon and full-resource clean treatment has become a huge challenge facing the world. Waste circuit boards are different from other hazardous wastes, in addition to having hug...

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Problems solved by technology

[0003] The recycling of waste circuit boards has attracted extensive attention from industry experts. At present, the widely used technical method is to remove the components of waste circuit boards first, and then crush and sort the substrates to recover valuable metal elements such as copper. There are components in this method The high energy consumption in the dismantling and substrate crushing stages and the non-metallic components produced cannot be recycled well, and the technical means are backward; the use of hydrometallurgy to recycle waste circuit boards is also a method that has attracted widespread attention. The hydrometallurgical system can recover valuable metal components in waste circuit boards, but there is also the problem that non-metallic components cannot be recycled well. In addition, a large amount of waste liquid generated by hydrometallurgical processes requires additional treatment. The problem to be solved; pyrolysis technology is an important focus of waste circuit board recycling technology at present. The existing pyrolysis process needs to remove the components on the waste circuit board in advance, and perform pyrolysis in an inert atmosphere such as vacuum or nitrogen. The pyrolysis source adopts secondary energy electricity or combustion indirect heating to supply heat, which has high energy consumption and low pyrolysis efficiency

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