Heavy metal stabilization method in garbage incineration ash

A technology of waste incineration and heavy metals, which is applied in the removal of solid wastes, etc., can solve the problems of poor hexavalent chromium effect, no effect of stabilizing heavy metals in grinding, and achieve the effect of improving sintering effect and preventing pollution.

Active Publication Date: 2009-02-04
TAMKANG UNIVERSITY
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As for the elution amount of hexavalent Cr before grinding is 0.02ppm, the elution amount after grinding for 2 hours is 0.51ppm, 0.8ppm for 4 hours, and 0.06ppm for 8 hours, so the effect of the grinding step on hexavalent chromium is not good. good
[0006] In addition to the above-mentioned documents published in Japan, other countries also have researches on the application of water extraction and grinding technology to incineration ash, but the purpose of grinding is the same as that of ceramic technology. It was found that grinding has the effect of stabilizing heavy metals [see for example Park, Y.J. and J.Heo, Conversion to glass-ceramics from glasses made by MSW incinerator fly ash for recycling. Ceramics International, 2002.28 (6): p.689-694; Cheng, T.W. and Y.S.Chen, On formation of CaO-Al2O3-SiO2 glass-ceramics by vitrification of incinerator fly ash. Chemosphere, 2003.51(9): p.817-824; Karamanov, A., et al., Sintered glass-ceramics from incinerator fly ashes. Part II. The influence of the particle size and heat-treatment on the properties. Journal of the European Ceramic Society, 2003.23(10): p.1609-1615; Karamanov, A., M.Pelino, and A.Hreglich, Sintered glass-ceramics from Municipal Solid Waste-incinerator flyashes--part I: the influence of the heating rate on the sinter-crystallisation. Journal of the European Ceramic Society, 2003.23(6): p.827-832]

Method used

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  • Heavy metal stabilization method in garbage incineration ash

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] Ordinary ball milling equipment (model: BM-104 (manufactured by OPTIMUMINSTRUMEN APPLICATI CO LTD) in Taiwan), the size of the grinding tank is 20.6 cm long, 20.5 cm inner diameter, and the volume is 6.8 liters, the grinding tank speed is 93rpm, grinding The material of the ball is alumina, the particle size is 5mm and 15mm, the combination of grinding balls is a mixture of two particle sizes and half the weight of each, and the filling volume of the grinding ball is 50% of the volume of the grinding tank (actually about 27% of the volume of the grinding tank) , The concentration of the grinding slurry (including the fly ash and water extracted by water, and the liquid-solid weight ratio of water to fly ash is 9) is 10% by weight (the liquid weight is 9 parts, and the solid weight is 1 part, so after conversion The weight concentration is 10% by weight), the slurry is about 33% of the grinding tank volume, the grinding dispersant is water, and the grinding time is 96 hou...

Embodiment 2

[0082] Take high-energy ball milling equipment, with planetary grinding equipment (Germany Retsch company manufacture, model: PM 100), rotating speed: 400rpm, time: 30 minutes, grinding slurry (comprising the fly ash after water extraction and water, water and fly ash Liquid-solid weight ratio is 5.67) weight concentration is 15% (water is 5.67 weight parts, and fly ash is 1 weight part, so weight concentration after conversion is 15 weight %), uses water as the wet grinding of grinding dispersant, fly after grinding Gray heavy metal TCLP concentration: lead below 0.2mg / L, copper below 0.1mg / L, zinc below 0.3mg / L, chromium below 0.6mg / L, cadmium below 0.01mg / L.

Embodiment 3

[0084] The volatilization rates of heavy metals in the fly ash after water extraction are: more than 25% of lead, more than 15% of copper, and more than 40% of cadmium at high temperature of 1000°C. Then adopt high-energy ball milling equipment, planetary grinding equipment (manufactured by German Retsch company, model: PM 100), speed: 400rpm, time: 30 minutes, use different grinding dispersants for wet grinding, respectively, can reduce the volatilization rate of heavy metals: lead It can be reduced to less than 4% (grinding with 0.8mole / L phosphoric acid solution), copper can be reduced to less than 3% (30% alumina is added, and water is used as a grinding dispersant to grind together), cadmium can be reduced to less than 6% ( Grinding with 0.2mole / L phosphoric acid solution).

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Abstract

The present invention relates to a method for stabilizing heavy metal in garbage cremated slag. The method comprises a water extraction step for removing soluble salt contained in the garbage cremated slag by water extraction cremated slag and a wet lapping step which ensures that the heavy metal contained in the garbage cremated slag is stabilized, so as to prevent the pollution to the environment caused by the heavy metal, promote the subsequent sintering effect and ensure that the disposed slag can be fired into regrown material by a sintering technology.

Description

technical field [0001] The present invention relates to a method for stabilizing heavy metals in waste incineration ash by means of water extraction and wet grinding, and the processed ash is made into recycled materials by sintering technology, such as conventional weight building aggregates, lightweight The use of building aggregates, various bricks or backfilling materials, etc. Background technique [0002] After municipal solid waste is incinerated, what remains in the incinerator bed or what is produced by the hearth during the incineration process is called bottom ash (Bottom Ash); and the incineration process will produce a large amount of waste gas, which is controlled by air pollution The material collected by the equipment is generally referred to as fly ash. The bottom slag can be subdivided into Grate Ash and Grate Siftings or Riddling. Hearth ash is the residue on the hearth after garbage incineration, mainly non-combustible inorganic substances, such as glas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B5/00B09B3/00
Inventor 高思怀孙常荣李明国何志轩庄家荣黄彦为
Owner TAMKANG UNIVERSITY
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