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Acid washing pretreatment method for domestic garbage incineration ash

A technology for incineration and pretreatment of domestic waste, applied in the direction of protection devices against harmful chemicals, etc., can solve problems such as hindering cement hydration, clogging of cement kilns, etc., to achieve harmless landfill or further resource utilization, The effect of reducing leaching toxicity

Inactive Publication Date: 2019-01-01
马井芳
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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 ash will hinder the hydration of cement, and volatile heavy metals will cause blockage of cement kilns, reducing the content of hydrochloride and some heavy metals in ash has become a key issue in ash resource utilization.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Under normal temperature and pressure conditions, add 100g of domestic waste incineration ash dried at 115°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 30-60 minutes, let stand for 15-20 minutes, separate the acid solution and ash in the upper layer, analyze the concentration of heavy metals in the acid solution, and analyze the residual chlorine content in the ash. Then pickling the pretreatment ashes with nitric acid with a mass percent concentration of 1%, 2%, 3%, 4%, and 5% respectively, and repeating the above operation steps.

Embodiment 2

[0014] Under normal temperature and pressure conditions, add 100g of domestic waste incineration ash dried at 115°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 30-60 minutes, stand still for 15-20 minutes, separate the upper layer of acid solution and ash, analyze the concentration of heavy metals in the acid solution, and analyze the residual chlorine content in the ash. Respectively with the mass percent concentration of 1%, 2%, 3%, 4%, 5% sulfuric acid pickling pretreatment ash, repeat the above steps.

Embodiment 3

[0016] Under normal temperature and pressure conditions, add 100g of domestic waste incineration ash dried at 115°C for 24 hours into a beaker, add 1000mL of 0.5% acetic acid solution by mass, and start the stirrer to fully mix the two. Stir for 30-60 minutes, stand still for 15-20 minutes, separate the upper layer of acid solution and ash, analyze the concentration of heavy metals in the acid solution, and analyze the residual chlorine content in the ash. Respectively with mass percent concentration of 1%, 2%, 3%, 4%, 5% acetic acid pickling pretreatment ashes, repeat the above steps.

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PUM

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Abstract

The invention discloses an acid washing pretreatment method for domestic garbage incineration ash. According to the present invention, different kinds of different concentrations of nitric acids, sulfuric acids, acetic acids, citric acids and phosphoric acids are added to ash based on the solubility of a large amount of chlorine salts in the ash, a large amount of the chlorine salts, the partial heavy metals and other pollutants in the garbage incineration ash are removed through mechanical stirring, and the ash being subjected to acid washing treatment achieves the harmless pretreatment purpose, and can be further landfilled or can be used for ecological cement raw material preparation and other resource utilizations; and through the acid washing, the ash can be treated with industrially-produced waste acids and the like so as to treat the waste with the waste.

Description

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

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A62D3/36
CPCA62D3/36A62D2101/43A62D2101/49
Inventor 马井芳
Owner 马井芳