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Pyrogenic treatment method for hazardous waste incineration ash

A technology for incineration of ash and slag and fire treatment, which is applied in combustion methods, chemical instruments and methods, incinerators, etc., can solve the problems of difficult transportation, limited wide application, low metal recovery rate, etc., to avoid secondary pollution, The effect of reducing dust pollution and high metal recovery rate

Inactive Publication Date: 2021-06-22
中节能(汕头)再生资源技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the fast-developing chelating organic heavy metal stabilizing agent has been proved by experiments to stabilize various heavy metal pollutants, but its long-term stability needs further investigation
In addition, the price of chelating agent is relatively expensive, and the stabilization effect on dioxin is not obvious, and the dehydration filtrate after fly ash treatment needs to be processed twice, which limits its wide application
[0007] Chinese patent CN 107338358A discloses a method for removing heavy metals and dioxins from incineration fly ash. A molten pool smelting device is used to smelt the fly ash, but the method has the following problems: When the air is used as the medium and sprayed into the molten pool smelting device, the form of fly ash will be unstable, and secondary pollution will easily occur
(2) The source of heat in the smelting process is coal powder, fuel oil, natural gas, etc., and the processing cost is relatively high
(3) The recovery rate of metals is low, and the additives of resmelting materials are electroplating sludge, tailings and smelting slag, etc., which are difficult to transport, and the operating costs for hazardous waste enterprises are high
(4) The patent only involves the treatment of fly ash and does not describe the process of hazardous waste incineration slag

Method used

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  • Pyrogenic treatment method for hazardous waste incineration ash

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Reaction raw materials: Hazardous waste incineration slag and flue gas system smoke and fly ash, waste circuit boards.

[0045] The reaction flux is quartz stone, limestone, pellets, pulverized coal and cement.

[0046] The oxygen-enriched air content in the spray gun is 30%, and the fuel sources are diesel oil blown into the spray gun, pulverized coal supplied by the raw material system, and waste circuit boards.

[0047] The solidified ash and waste circuit boards are mixed at a ratio of 1:1, and then transported by a belt into the top-blown melting pool melting furnace for melting. During the melting process, quartz stone, limestone and pulverized coal are added. The temperature of the melting process is controlled at 1100°C. It is CaO-SiO2-A12O3-FeO quaternary slag type, the iron-silicon ratio is controlled at 1.0-1.5 during the top blowing smelting process, and the oxygen-material ratio is 0.35.

[0048] The flue gas produced by smelting enters the flue gas system...

Embodiment 2

[0051] Reaction raw materials: Hazardous waste incineration slag and flue gas system smoke and fly ash, resin powder.

[0052] The reaction flux is quartz stone, limestone, pellets, pulverized coal and cement.

[0053] The oxygen-enriched air content in the spray gun is 65%, and the fuel source is diesel oil blown into the spray gun, pulverized coal and resin powder supplied by the raw material system.

[0054] After the solidified ash and resin powder are mixed according to the ratio of 1:2, they are transported by a belt into the top-blown melting pool melting furnace for melting. During the melting process, quartz stone, limestone and pulverized coal are added. The temperature of the melting process is controlled at 1000°C. CaO-SiO2-A12O3-FeO quaternary slag type, the iron-silicon ratio is controlled at 1.0-1.5 during the top blowing smelting process, and the smelting oxygen-material ratio is 0.5.

[0055] The flue gas produced by smelting enters the flue gas system and is...

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Abstract

The invention relates to a pyrogenic treatment method for hazardous waste incineration ash. The method comprises the following steps: adding a curing agent into ash for curing treatment, mixing the cured ash with waste circuit boards and other combustible materials according to a certain ratio to form a mixed raw material, adding a flux into the mixed raw material, and feeding the mixed raw material into a smelting system for pyrogenic smelting to obtain slag, crude copper and other metal phases adsorbed in the crude copper; purifying flue gas generated by smelting by a flue gas system and then discharging the purified flue gas after the purified flue gas reaches the standard; and enabling soot generated by the flue gas system to enter a raw material workshop to be subjected to raw material proportioning again and then carrying out secondary smelting. The method can be used for industrial and large-scale production, the treatment cost is low, the ash utilization rate is high, secondary pollution is avoided, the metal recycling rate is high, and recycling and harmless treatment of the ash is achieved essentially.

Description

technical field [0001] The invention relates to a technical field related to hazardous waste incineration, in particular to a pyroprocessing method for hazardous waste incineration ash. Background technique [0002] With the strengthening of environmental protection supervision and the improvement of hazardous waste management system, the annual output of hazardous waste in my country is increasing year by year, and the amount of hazardous waste treatment is also increasing steadily. It is still a problem to be overcome. The output of fly ash is large, and at the same time, fly ash contains a large amount of heavy metal elements, salts, and dioxins with high toxic equivalents. disposal. In 2016, the amount of hazardous waste incineration in my country was 1.1 million tons. At present, the fly ash of hazardous waste incineration is mainly solidified and safely landfilled. However, compared with the rapid growth of hazardous waste output at an annual rate of 12%, The limited ...

Claims

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Application Information

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IPC IPC(8): B09B3/00F23G7/00C22B7/02
CPCC22B7/004C22B7/02B09B2101/30B09B3/40Y02W30/82Y02P10/20
Inventor 类鸣栾海桥黄文施建龙
Owner 中节能(汕头)再生资源技术有限公司
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