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Harmless disposal method of dangerous waste slag

A technology of harmless treatment and waste residue, applied in cement production and other directions, can solve problems such as lack of treatment methods, and achieve the effect of recycling

Inactive Publication Date: 2019-07-23
佛山领成环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods can recover most of the harmful substances in the hazardous waste residue, but there are still a small part of harmful substances that cannot be smoked into the smoke and remain in the slag. For this part of harmful substances, there is no effective treatment method in the prior art

Method used

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  • Harmless disposal method of dangerous waste slag
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  • Harmless disposal method of dangerous waste slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] like figure 1 As shown, this embodiment provides a treatment method for hazardous waste residues, using high-temperature fuming and volatilization methods to volatilize most of the harmful substances into the dust, and the remaining small amount of unvolatile harmful substances and vitrification auxiliary materials form insoluble salts, which are processed by Quenched by water to form a vitreous body, forming a harmless general solid waste. Specific steps are as follows:

[0034] Step 1: Mix hazardous waste slag and vitrification auxiliary materials evenly, place them in a fuming furnace, inject pulverized coal and air for high-temperature fuming, and obtain flue gas and slag.

[0035] Step 2: Harmful substances are recovered from the flue gas; the slag is water-quenched in a closed water quenching chamber to obtain vitrified water-quenched slag, high-temperature water vapor and water-quenched wastewater, vitrified water-quenched slag is used for cement production, hig...

Embodiment 2

[0037] like figure 1 As shown, this embodiment provides a treatment method for hazardous waste residue containing arsenic, using high-temperature fuming and volatilization method to make most of the arsenic volatilize into the soot, and the remaining small amount of unvolatile arsenic forms insoluble with vitrification auxiliary materials iron and calcium. Salts are rapidly cooled by water to form a vitreous body, forming harmless general solid waste. Specific steps are as follows:

[0038] Step 1: Collect hazardous waste residue containing arsenic, detect the content of arsenic in the hazardous waste residue according to the method in the prior art, then mix the hazardous waste residue and vitrification auxiliary materials evenly, place in the fuming furnace, spray pulverized coal and air, Fume at 1200°C for 40 minutes to obtain flue gas and slag. Among them, the vitrification auxiliary materials are iron reagent and calcium reagent, and the mass ratio of iron, calcium and ...

Embodiment 3

[0041] like figure 1 As shown, this embodiment provides a treatment method for hazardous waste residue containing arsenic, using high-temperature fuming and volatilization method to make most of the arsenic volatilize into the soot, and the remaining small amount of unvolatile arsenic forms insoluble with vitrification auxiliary materials iron and calcium. Salts are rapidly cooled by water to form a vitreous body, forming harmless general solid waste. Specific steps are as follows:

[0042]Step 1: Collect hazardous waste residue containing arsenic, detect the content of arsenic in the hazardous waste residue according to the method in the prior art, then mix the hazardous waste residue and vitrification auxiliary materials evenly, place in the fuming furnace, spray pulverized coal and air, Fume at 1400°C for 20 minutes to obtain flue gas and slag. Wherein, vitrification auxiliary materials are iron reagent and calcium reagent, and the mass ratio of iron, calcium and arsenic ...

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Abstract

The invention discloses a harmless disposal method of dangerous waste slag, and relates to the technical field of environmental protection. The method includes the steps that the dangerous waste slagand auxiliary materials are mixed to be uniform, the mixture is put in a fuming furnace, powdered coal and air are sprayed for high-temperature fuming, and flue gas and furnace slag are obtained; harmful substances are recovered from the flue gas; and the furnace slag is water-quenched, and vitrified water-quenched slag, high-temperature vapor and water-quenched waste water are obtained, wherein the vitrified water-quenched slag is used for cement production, and the high-temperature vapor and the water-quenched waste water are recovered and reused. By means of the method, a high-temperature fuming volatilizing method is adopted, most harmful substances in the dangerous waste slag volatilize into smoke dust, the harmful substances are recovered from the smoke dust, insoluble salt is generated by a small part of the harmful substances and the vitrified auxiliary materials in the fuming process, thus, the harmful substances are left in the furnace slag, more stable vitreous bodies are formed through water-quenching and rapid cooling, the purpose of solidifying dangerous waste is achieved, recovery of resources is achieved, harmless disposal is achieved, and the method is especially suitable for disposing the dangerous waste slag containing arsenium or lead.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a harmless treatment method for hazardous waste residue. Background technique [0002] According to statistics, the annual hoarding of arsenic-containing waste residues in my country reaches more than 2 million tons, and the amount of lead-zinc residues reaches as much as 4 million tons. These dangerous weapons not only occupy a large amount of land resources during the open-air stacking process, but also the arsenic, lead, and zinc in the waste residue are easily released into the natural environment after natural weathering and leaching, causing damage to the surrounding ecological environment such as soil, surface water, and groundwater. Serious pollution and potential hazards will eventually directly or indirectly endanger human life and health. [0003] Due to the high industrial value of arsenic, lead and other substances, the recovery of these substances ...

Claims

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Application Information

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IPC IPC(8): C22B7/00C04B7/147
CPCC04B7/147C22B7/001Y02P40/10
Inventor 贺子凯
Owner 佛山领成环境科技有限公司