A low-carbon and high-efficiency clean recycling method for full resource recycling of waste circuit boards

Abstract

The invention discloses a low-carbon and high-efficiency full-resource clean recovery method of waste circuit boards. The method is to place the waste circuit boards in a pyrolysis furnace, and feed oxygen and gas into the pyrolysis furnace to perform insufficient oxygen deficiency. Combustion provides a heat source and atmosphere for the pyrolysis of waste circuit boards, controls the temperature in the pyrolysis furnace to continue to rise, the solder is recovered in liquid form, the pyrolysis slag is enriched at the bottom of the furnace, the pyrolysis gas is recovered from the top of the furnace, and the pyrolysis gas is recovered through condensation After the oil is pyrolyzed, the condensed residual gas is washed with lye and returned to the pyrolysis furnace as gas. This method is simple to operate, low in energy consumption, and can realize low-carbon, high-efficiency, and full-resource clean recycling of waste circuit boards.

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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