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Treatment method for waste circuit board pyrolysis recovery

The technology of a waste circuit board and a treatment method, which is applied in the treatment field of waste circuit board pyrolysis recovery, can solve problems such as environmental pollution, and achieve the effects of improving metal recovery rate, avoiding dioxin production, and reducing processing cost.

Inactive Publication Date: 2018-04-03
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The technical problem to be solved by the present invention is to overcome the deficiencies and defects mentioned in the above background technology, provide a method for effectively avoiding the environmental pollution caused by dioxins in the waste circuit board recycling process, and realize the waste Recycling and energy-based clean recycling of circuit boards

Method used

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  • Treatment method for waste circuit board pyrolysis recovery
  • Treatment method for waste circuit board pyrolysis recovery
  • Treatment method for waste circuit board pyrolysis recovery

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Embodiment

[0043] A treatment method for waste circuit board pyrolysis recovery of the present invention, such as figure 1 and 2 shown, including the following steps:

[0044] (1) Use the first rotary hammer crusher 1 to crush the entire waste circuit board into small pieces with a diameter of 1-2mm, and then use the first high-voltage electrostatic metal separator 2 to carry out electrostatic separation, so that the waste The total content of resin and glass fiber in the circuit board is reduced from 60% to 80% to 20% to 30%, and metal-containing concentrates and small plastic plates are obtained;

[0045] (2) Precisely control the temperature of the fine material obtained after the electrostatic sorting in the step (1) and perform pyrolysis treatment under the anaerobic condition of 600°C. The pyrolysis treatment is carried out in the pyrolysis furnace 3, and the pyrolysis time is 10 -15min, to obtain flue gas and carbon-containing polymetallic powder formed by pyrolysis;

[0046] (...

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Abstract

The invention discloses a treatment method for waste circuit board pyrolysis recovery. The method comprises the following steps that waste circuit boards are subjected to crushing, electrostatic separation and pyrolysis treatment to obtain flue gas and carbon-containing multi-metal materials, the carbon-containing multi-metal materials are subjected to electrostatic separation to obtain carbon powder and multi-metal materials, and the flue gas is subjected to secondary combustion, selective catalytic reduction treatment, quenching treatment, adsorption treatment and dust removal treatment to obtain the flue gas superior to the emission standard. By means of the treatment method, metal and non-metal substances in the waste circuit boards can be effectively separated, industrial continuous treatment of the waste circuit boards and recycling of resources are achieved, and the metal recovery rate reaches nearly 99.9%; besides, dioxin can be effectively prevented from being generated, and the dioxin removal efficiency is higher than 99.9%.

Description

technical field [0001] The invention belongs to the technical field of resource recovery, and in particular relates to a treatment method for pyrolysis recovery of waste circuit boards. Background technique [0002] With the rapid development of the electronic information industry, the replacement speed of electronic products is gradually accelerating, and electronic waste is growing at a rate of 3% to 5% per year, and has become one of the fastest growing types of municipal solid waste. A huge amount of electronic waste has brought a huge threat to the global ecological environment and has become a new environmental problem that plagues global sustainable development. As the main component of electronic waste, the recycling of waste circuit boards is the basis and difficulty for the recycling and reuse of electronic waste. Circuit boards have dual potentials of "environmental pollution" and "resource regeneration". On the one hand, they contain heavy metals such as lead an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00C10B53/00C10B57/00B01D53/86
CPCB01D53/8625B01D53/8668C10B53/00C10B57/00B09B3/80B09B3/40Y02W30/82
Inventor 郭学益张婧熙田庆华李栋
Owner CENT SOUTH UNIV
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