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Waste and old circuit board exhaust-gas treatment technology and device thereof

A waste circuit board and waste gas treatment technology, applied in combustion methods, dispersed particle filtration, lighting and heating equipment, etc., can solve the problem of waste circuit board recycling waste gas pollution, etc., to facilitate continued processing, save pipeline costs, and avoid load generation Effect

Inactive Publication Date: 2017-05-10
JIANGXI GREEN ECO MFG RESOURCE CYCLE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] In order to overcome the deficiencies of the prior art, the purpose of the present invention is to provide a waste circuit board exhaust gas treatment process and its device to solve the serious problem of existing waste circuit board recovery exhaust gas pollution

Method used

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  • Waste and old circuit board exhaust-gas treatment technology and device thereof

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Embodiment 1

[0031] A waste circuit board exhaust gas treatment process, comprising the following steps:

[0032] Step 1. Combusting the waste gas produced by cracking; the waste gas is combusted in the second combustion chamber at a temperature of 900-1150° C. and the combustion time is 2-5 s.

[0033] Step 2, blowing and diluting the exhaust gas burned in the second combustion chamber, and then spraying the exhaust gas with urea, spraying a urea solution with a mass percentage of 28% to 40%;

[0034] Step 3: sending the waste gas after spraying the urea solution into the waste heat boiler to recover heat and cool down, so that the temperature of the waste gas drops to 180-220°C. ,

[0035] Step 4. Purify the waste gas after recovering heat, and spray NaHCO into the waste gas 3 powder, spraying activated carbon into the exhaust

[0036] Step 5. Send the purified exhaust gas to the bag filter for dust removal, and then discharge it.

[0037] Of course, the concentration of the urea sol...

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Abstract

The invention relates to a waste and old circuit board exhaust-gas treatment technology. The waste and old circuit board exhaust-gas treatment technology comprises the following the steps: 1) combusting: combusting exhaust gas generated by cracking; 2) spraying with urea: spraying an urea solution on the combusted exhaust gas; 3) cooling: cooling the exhaust gas after spraying with the urea solution; 4) purifying: purifying the cooled exhaust gas, spraying NaHCO3 powder; and 5) dedusting: dedusting the purified exhaust gas and then discharging the exhaust gas. According to the invention, dioxins in exhaust gas can be eliminated through combustion, nitrogen oxide in exhaust gas is eliminated by spraying the urea solution, sodium bicarbonate powder is continuously sprayed after cooling, and the pollutants such as halogen hydride in the exhaust gas is neutralized, so that the cracked exhaust gas can reach a discharge standard, and the pollution is not generated.

Description

technical field [0001] The invention relates to the technical field of recycling waste circuit boards, in particular to a waste gas treatment process and device for waste circuit boards. Background technique [0002] As an important component of electronic waste, waste printed circuit boards contain various heavy metals and harmful substances such as lead, cadmium, polyvinyl chloride plastic, and brominated flame retardants on the one hand, which have potential environmental pollution; on the other hand, they contain copper , gold, silver and other common metals and rare precious metals, with high recycling value. [0003] With the implementation of my country's sustainable development strategy, higher requirements are put forward for environmental protection, and the recycling and utilization of electronic waste has become a thorny issue faced by most countries. At present, my country has become a big country in the production and consumption of household electrical applia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01D53/83B01D53/10B01D46/02F23G7/06
Inventor 许开华鲁习金
Owner JIANGXI GREEN ECO MFG RESOURCE CYCLE
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