Curing method for heavy metals in waste incineration ash and application thereof

A technology of waste incineration ash and solidification method, which is applied in the fields of environmental protection and solid waste resource utilization, can solve problems such as environmental and groundwater pollution, threaten human health, etc., and achieve the effect of no waste gas emission and easy control.

Active Publication Date: 2016-09-28
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Generally speaking, bottom ash is considered a safe and stable product, which can be used for roadbed laying, cement, etc. Zn, Cd, Cr, etc., their leaching during the utilization process will cause certain pollution to the environment and groundwater, thereby threatening human health

Method used

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  • Curing method for heavy metals in waste incineration ash and application thereof
  • Curing method for heavy metals in waste incineration ash and application thereof
  • Curing method for heavy metals in waste incineration ash and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0025] This embodiment 1 is solidifying the heavy metals in the fly ash of the waste incineration of the grate furnace, which specifically includes the following steps:

[0026] (1) Get 8g of waste incineration fly ash under the grate furnace incineration mode, dissolve it in 80ml deionized water, mix well, and make a mixed solution;

[0027] (2) Get the grinding balls so that the solid mass ratio of the total mass of the grinding balls to the grate furnace waste incineration ash in step (1) is 12 (that is, the total mass of the grinding balls is 96g). Add the grinding balls to the mixed solution prepared in step (1); the grinding balls with a total mass of 96g can be combined in the following way: 30 small-sized grinding balls with a diameter of 6mm, and 20 large-sized grinding balls with a diameter of 10mm .

[0028] (3) Put the ball mill jar in a planetary ball mill, and work for 24 hours at normal temperature and pressure with a rotating speed of 250 rpm;

[0029] (4) Ta...

Embodiment 2

[0031] This embodiment 2 is to solidify the heavy metals in the fly ash of fluidized bed waste incineration, which specifically includes the following steps:

[0032] (1) Get 8g of waste incineration fly ash under the fluidized bed incineration mode, dissolve in 80ml of deionized water, mix well, and make a mixed solution;

[0033] (2) Take the grinding balls so that the ratio of the total mass of the grinding balls to the solid mass of the waste incineration ash in the step (1) is 12, and add the grinding balls to the mixed solution prepared in the step (1). The grinding balls with the above total mass can be combined in the following manner: 30 small-sized grinding balls with a diameter of 6 mm, and 20 large-sized grinding balls with a diameter of 10 mm.

[0034] (3) Put the ball mill jar in a planetary ball mill, and work for 24 hours at normal temperature and pressure with a rotating speed of 250 rpm;

[0035] (4) Take out the ball milling tank, pour out the solution insi...

Embodiment 3

[0037] This embodiment 3 is to solidify the heavy metals in the fly ash of the waste incineration of the grate furnace, which specifically includes the following steps:

[0038] (1) Get 5g of waste incineration fly ash under the grate furnace incineration mode, dissolve it in 80ml of deionized water, mix evenly, and make a mixed solution;

[0039] (2) Take the grinding balls so that the ratio of the total mass of the grinding balls to the solid mass of the waste incineration ash in the step (1) is 12, and add the grinding balls to the mixed solution prepared in the step (1). The grinding balls with the above total mass can be combined in the following manner: 21 small-sized grinding balls with a diameter of 6 mm, and 12 large-sized grinding balls with a diameter of 10 mm.

[0040] (3) Put the ball mill jar in the planetary ball mill, and work for 6 hours at normal temperature and pressure, with a rotating speed of 350rpm;

[0041] (4) Take out the ball milling tank, pour out ...

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Abstract

The invention discloses a curing method for heavy metals in waste incineration ash and application thereof. The curing method comprises the steps of (1) mixing waste incineration ash with water to form a mixture according to a certain proportion, putting the mixture in a ball milling pot, and then, adding grinding balls into the ball milling pot; and (2) sealing the ball milling pot, then, enabling the ball milling pot to perform ball milling treatment under the driving of a planetary ball mill, then, opening the ball milling pot, separating the grinding balls to obtain a ball milling product, then, filtering the ball milling product, and drying filter residues for 4 h to 24 h at the temperature of 60 DEG C to 85 DEG C, so as to obtain waste incineration ash with cured heavy metals. According to the curing method, key ball milling technologies such as the proportion of the mixture, the mass and diameter specifications of the grinding balls and the reaction conditions of the follow-up treatment technologies are improved, the harmful heavy metals in original waste incineration ash are cured, the leaching is reduced, and the environmental protection application approach of waste incineration ash is expanded.

Description

technical field [0001] The invention belongs to the technical fields of solid waste resource utilization and environmental protection, and more specifically relates to a method for solidifying heavy metals in waste incineration ash and its application. Background technique [0002] With the intensification of urbanization in China, the amount of municipal solid waste generated is increasing year by year; among the large and medium-sized cities, about two-thirds of them are surrounded by waste. Such a large amount of waste generation needs to find a reasonable treatment and disposal method. Under normal circumstances, the waste disposal methods are landfill, composting and incineration. According to literature reports, landfill treatment accounts for about 40% to 50% of waste disposal, but with the reduction of arable land and the increase of landfill costs, and long-term landfills may cause pollutants such as heavy metals in waste to penetrate to the water body, thereby end...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00B09B5/00
CPCB09B3/00B09B5/00B09B2101/30
Inventor 乔瑜李挺豪王文霞周俊波黄经春成珊徐明厚
Owner HUAZHONG UNIV OF SCI & TECH
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