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A method for energy-saving and harmless treatment of waste electrical circuit boards

A technology for harmless treatment and circuit boards, which is applied in waste treatment, combustion methods, incinerators, etc., to achieve the effect of simple waste recycling process, good environmental benefits, and thorough resource utilization.

Active Publication Date: 2016-06-22
长沙紫宸科技开发有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0039] Based on this, there is an urgent need for a new method that can utilize existing general equipment to deal with the rapidly growing problem of energy-based and harmless utilization of waste electrical circuit boards.

Method used

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  • A method for energy-saving and harmless treatment of waste electrical circuit boards
  • A method for energy-saving and harmless treatment of waste electrical circuit boards
  • A method for energy-saving and harmless treatment of waste electrical circuit boards

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0082] In this example, a test is carried out on a fluidized bed furnace (designed as a small fluidized bed boiler) (with a heat exchange water pipe network installed inside the furnace) on an industrial trial production line for roasting stone coal to extract vanadium for power generation. The fluidized fluidized furnace is equipped with a main combustion chamber, flue settlement chamber and cyclone dust collector and electric dust collector, the flue gas from the main combustion chamber is drawn into the cyclone dust collector through the flue settling chamber, and then drawn into the electric dust collector through the flue gas pipe for dust removal and then emptied. Before the test, the power generation system of the fluidized fluidized furnace was technically improved: an alkalizing agent metering device, a central furnace inlet air duct, a thermocouple in the lower, middle and upper parts of the furnace, and O 2 Content real-time detector, flue settling chamber heat excha...

Embodiment 2

[0093]The present embodiment is carried out on the fluidized bed boiler power generation industrial test line of the embodiment 1, comprising the following steps:

[0094] 1) Preparation of materials: take waste electrical appliances including circuit boards from a storage yard and use a hammer crusher to crush them into block materials with a particle size of less than 200mm; 10 times water and stir well for later use;

[0095] 2) Alkalinization incineration: Feed block materials and alkalizing agent continuously and evenly into the fluidized bed boiler. The alkalizing agent is quicklime powder and calcium nitrate, and the dosage is equivalent to 5% of the mass of waste electrical circuit boards as raw materials, of which quicklime Powder: Calcium nitrate is mixed evenly at a mass ratio of 9:1; the alkalizing agent is fine grain or powder with a particle size of less than 5mm; the alkalization incineration temperature in the furnace is 1080°C to 1200°C;

[0096] 3) Enrichmen...

Embodiment 3

[0101] This example is tested in a new dry-process cement production plant with a cement kiln waste heat power generation system and a fluidized bed furnace for drying. The fluidized bed furnace of the cement plant was originally used to supply hot air for drying raw materials. "Flue + cyclone dust collector", the hot flue gas in the furnace is drawn into the rotary drum dryer through the flue, cyclone dust collector and then through the flue gas pipeline. The waste gas from the waste heat boiler of the waste heat power generation system of the original cement kiln is emptied after being dusted by the bag filter.

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PUM

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Abstract

The invention discloses an energy-regeneration pollution-free disposal method for a waste electrical appliance circuit board. The energy-regeneration pollution-free disposal method comprises the following steps: coarsely crushing the waste electrical appliance circuit board, performing alkalization and incineration at a temperature of 870-1400 DEG C to enrich multiple metals; cooling the incineration smoke in a hierarchical manner to coarsely separate the enriched metal oxides; collecting dust through a pipeline membrane process, removing dust through a dust collector, discharging after performing catalytic oxidative purifying, heating boiler stream through incineration heat energy to drive a steam turbine to generate power. The energy-regeneration pollution-free disposal method is simple and reliable, free of emission of harmful residues, waste gas and wastewater and free of secondary pollution; moreover, multiple metals in the waste circuit board can be completely enriched and recycled.

Description

technical field [0001] The invention relates to the field of environmental protection and waste utilization, in particular to a method for energy-saving and harmless treatment of waste electrical circuit boards. Background technique [0002] With the development of modern technology, a large number of household appliances have been replaced and upgraded, and the waste electrical circuit boards have grown at an average annual rate of about 18%, and have become the fastest growing garbage in the world today, especially waste circuit boards, because of their complex composition, Improper handling will cause irreversible damage to the environment. [0003] The waste circuit boards include waste copper clad laminates (CCL), waste printed circuit boards (PCB), printed circuit boards with integrated circuits and electronic devices (generally called waste circuit boards). Among them: copper clad laminate (CCL) is the raw material for the production of printed circuit boards, mainly...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09B3/00B09B5/00F23G7/00F23G5/30
CPCY02E20/12Y02W30/20Y02W30/82
Inventor 尹小林郭学益田庆华李栋
Owner 长沙紫宸科技开发有限公司
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