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Sulfuric acid refining preprocessing method of life refuse burning flying ash

A technology for incineration and pretreatment of domestic waste, applied in the field of environmental engineering, can solve problems such as hindering cement hydration and clogging of cement kilns, achieve the effects of harmless landfill resource utilization, and reduce leaching toxicity

Inactive Publication Date: 2008-08-13
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since a large amount of hydrochloride in fly ash will hinder the hydration of cement, and volatile heavy metals will cause clogging of cement kilns, reducing the content of hydrochloride and some heavy metals in fly ash has become a key issue for fly ash resource utilization

Method used

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  • Sulfuric acid refining preprocessing method of life refuse burning flying ash
  • Sulfuric acid refining preprocessing method of life refuse burning flying ash
  • Sulfuric acid refining preprocessing method of life refuse burning flying ash

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Under normal temperature and pressure conditions, add 100g of domestic waste incineration fly ash dried at 105°C for 24 hours into a beaker, add 1000mL of nitric acid solution with a concentration of 0.5% by mass, and start the stirrer to fully mix the two. Stir for 20-60 minutes, stand still for 10-20 minutes, separate the upper layer of acid solution and fly ash, analyze the concentration of heavy metals in the acid solution, and analyze the residual chlorine content in the fly ash. Then pickle the pretreated fly ash with nitric acid with a concentration of 1%, 2%, 3%, 4%, and 5% by mass percentage respectively, and repeat the above operation steps. The experimental results are shown in Tables 1 and 2.

[0014] Table 1 Effect of nitric acid pickling fly ash

[0015]

[0016] Table 2 Concentration of heavy metals in nitric acid solution after pretreatment of fly ash (mg / L)

[0017]

Embodiment 2

[0019] Under normal temperature and pressure conditions, add 100g of domestic waste incineration fly ash dried at 105°C for 24 hours into a beaker, add 1000mL of sulfuric acid solution with a concentration of 0.5% by mass, and start the stirrer to fully mix the two. Stir for 20-60 minutes, stand still for 10-20 minutes, separate the upper layer of acid solution and fly ash, analyze the concentration of heavy metals in the acid solution, and analyze the residual chlorine content in the fly ash. Then pickle the pretreated fly ash with sulfuric acid with a mass percent concentration of 1%, 2%, 3%, 4%, and 5%, respectively, and repeat the above operation steps. The experimental results are shown in Tables 3 and 4.

[0020] Table 3 Effect of sulfuric acid pickling fly ash

[0021]

[0022] Table 4 Concentration of heavy metals in sulfuric acid solution after pretreatment of fly ash (mg / L)

[0023]

Embodiment 3

[0025] Under normal temperature and pressure conditions, add 100g of domestic waste incineration fly ash dried at 105°C for 24 hours into a beaker, add 1000mL of acetic acid solution with a concentration of 0.5% by mass, and start the stirrer to fully mix the two. Stir for 20-60 minutes, stand still for 10-20 minutes, separate the upper layer of acid solution and fly ash, analyze the concentration of heavy metals in the acid solution, and analyze the residual chlorine content in the fly ash. Then pickling the pretreated fly ash with 1%, 2%, 3%, 4% and 5% acetic acid in concentration by mass percentage respectively, and repeating the above operation steps. The experimental results are shown in Tables 5 and 6. See Tables 7, 8, 9 and 10 for the test results of citric acid and phosphoric acid pickling fly ash.

[0026] Table 5 Effect of acetic acid pickling fly ash

[0027]

[0028] Table 6 Concentration of heavy metals in acetic acid solution after pr...

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Abstract

The present invention provides an acid cleaning pretreatment method of household garbage fly ash, belonging to the environmental engineering technical field. The method is separating supernatant fluid to fly ash by mixing the household garbage fly ash with sulphuric acid, hydrochloric acid, citric acid, phosphoric acid etc under the normal temperature, blending and static settlement. The invention also can remove a mass of contamination such as soluble chloride salt and part heavy metalin the household garbage fly ash; the fly ash after acid cleaning achieves harmless aim, futher filled or resource utilization.

Description

technical field [0001] The invention relates to a pickling pretreatment method for incineration fly ash of domestic garbage, which belongs to the technical field of environmental engineering. Background technique [0002] The fly ash produced by municipal solid waste incineration is hazardous waste numbered HW18 in the National Hazardous Waste List. Fly ash is polluted by a large amount of chloride salts, heavy metals and dioxin / furan organic matter. At present, most countries adopt the treatment method of cement solidification and stabilization of fly ash and then landfill, which not only consumes a large amount of cement materials, but also limits its popularization and use due to the high volumetric ratio after solidification. [0003] The main components of incineration fly ash are CaO, Al 2 o 3 , SiO 2 etc., which are basically the same as the raw materials required for cement production, so fly ash can be used in cement concrete and other building material industri...

Claims

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Application Information

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IPC IPC(8): B01J15/00
Inventor 杨晓燕钱光人陈建辉孙福成
Owner SHANGHAI UNIV
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