Heavy metal stabilizing method in process of preparing filler by chemical sludge burning ash

A technology of heavy metal stabilizer and incineration ash residue is applied in the field of chemical sludge recycling and mixing inorganic heavy metal stabilizer to achieve heavy metal stabilization. The effect of less pollution, short disposal cycle and low operating cost

Active Publication Date: 2013-06-12
NANJING UNIV OF TECH
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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for stabilizing heavy metals in the process of preparing packing from chemical sludge incineration ash in order to improve the deficiencies of the prior art, which is combined with the process of making packing from chemical sludge incineration ash to achieve The harmless and resourceful disposal of sludge solves the problems of high operating cost, long disposal cycle, and secondary pollution in the existing chemical sludge treatment and disposal methods

Method used

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  • Heavy metal stabilizing method in process of preparing filler by chemical sludge burning ash
  • Heavy metal stabilizing method in process of preparing filler by chemical sludge burning ash
  • Heavy metal stabilizing method in process of preparing filler by chemical sludge burning ash

Examples

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Effect test

Embodiment 1

[0016] In this example, chemical sludge incineration ash was used as raw material. The schematic diagram of the process flow is shown in Figure 1.

[0017] Table 1 Chemical sludge incineration ash leaching test results

[0018]

[0019] Calcium oxide and potassium dihydrogen phosphate are mixed in a certain proportion, water is added, stirred thoroughly, heated and evaporated to make potassium calcium phosphate cementing material. Then add bentonite to prepare inorganic heavy metal stabilizer. Bentonite accounts for 80% of the mass of the stabilizer, calcium oxide accounts for 15% of the mass of the stabilizer, and potassium dihydrogen phosphate accounts for 5% of the mass of the stabilizer. Chemical sludge incineration ash and clay are ground into powdery particles with uniform particle size, and passed through a 200-mesh sieve after grinding. After grinding and sieving, the sludge incineration ash and clay are mixed with inorganic heavy metal stabilizers in a certain mas...

Embodiment 2

[0025] The raw material of this example is chemical sludge incineration ash, and the heavy metal leaching concentration of chemical sludge incineration ash used in this study is shown in Table 3.

[0026] Table 3 Chemical sludge incineration ash leaching test results

[0027]

[0028] Calcium oxide and potassium dihydrogen phosphate are mixed in a certain proportion, water is added, stirred thoroughly, heated and evaporated to make potassium calcium phosphate cementing material. Then add bentonite to prepare inorganic heavy metal stabilizer. Bentonite accounts for 60% of the mass of the stabilizer, calcium oxide accounts for 30% of the mass of the stabilizer, and potassium dihydrogen phosphate accounts for 10% of the mass of the stabilizer. Chemical sludge incineration ash and clay are ground into powdery particles with uniform particle size, and passed through a 200-mesh sieve after grinding. After grinding and sieving, the sludge incineration ash and clay are mixed with ...

Embodiment 3

[0035] The raw material of this example is chemical sludge incineration ash, and the heavy metal leaching concentration of chemical sludge incineration ash used in this study is shown in Table 5.

[0036] Table 5 Leaching test results of chemical sludge incineration ash

[0037]

[0038] Calcium oxide and potassium dihydrogen phosphate are mixed in a certain proportion, water is added, stirred thoroughly, heated and evaporated to make potassium calcium phosphate cementing material. Then add bentonite to prepare inorganic heavy metal stabilizer. Bentonite accounts for 40% of the mass of the stabilizer, calcium oxide accounts for 45% of the mass of the stabilizer, and potassium dihydrogen phosphate accounts for 15% of the mass of the stabilizer. Chemical sludge incineration ash and shale are ground into powdery particles with uniform particle size, and then passed through a 200-mesh sieve. After grinding and sieving, the sludge incineration ash and shale are mixed with inorg...

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Abstract

The invention relates to a heavy metal stabilizing method in a process of preparing filler by chemical sludge burning ash. An inorganic heavy metal stabilizer is prepared by using calcium oxide and potassium dihydrogen phosphate to prepare a calcium potassium phosphate cementing material supplemented by bentonite; the chemical sludge burning ash is used as a raw material, clay or shale is used as an auxiliary material, and a small amount of the inorganic heavy metal stabilizer is doped; and the raw material, the auxiliary material and the inorganic heavy metal stabilizer are mixed according to a certain proportion and stirred by adding water, pelletted and sintered to prepare the filler with small heavy metal leaching rate. The invention provides the heavy metal stabilizing method which is in good stabilizing effect and has universality to different heavy metal components and shapes. The process for preparing the filler by using the chemical sludge burning ash doped with the inorganic heavy metal stabilizer has the advantages of low operating cost, short disposal period, small secondary pollution, high degree of resources and the like compared with the conventional chemical sludge treatment and disposal manner.

Description

technical field [0001] The invention relates to a harmless and resourceful method of hazardous solid waste, namely a method for stabilizing heavy metals in the process of preparing filler from chemical sludge incineration ash, specifically a process of preparing filler from chemical sludge incineration ash A method for stabilizing heavy metals and recycling chemical sludge by mixing inorganic heavy metal stabilizers in the medium. Background technique [0002] There are more than 100,000 large and small chemical enterprises in my country, and these chemical enterprises produce tens of thousands of tons of chemical surplus sludge every day. Chemical sludge has complex components, contains a variety of toxic and refractory organic matter and heavy metals, and is a hazardous solid waste. The most common way to dispose of chemical sludge is incineration. During the incineration process, the organic matter in the sludge is burned and removed, but the heavy metals remain in the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B33/135C04B33/02
CPCY02P40/60
Inventor 俞敏洁徐炎华胡俊孙婧刘权李溪
Owner NANJING UNIV OF TECH
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