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Method for preparing ceramsite by utilizing dried sludge and burnt fly ash

A technology for incinerating fly ash and dry sludge, which is applied in the direction of dehydration/drying/concentrated sludge treatment, etc. It can solve the problems of limited scope of application and single disposal object, and achieve high demand, reduce defective rate, and prevent bursting Effect

Inactive Publication Date: 2011-05-18
TIANJIN TEDA ENVIRONMENTAL PROTECTION +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the preparation of ceramsite is a very promising treatment and resource utilization method for incineration fly ash and municipal sludge. However, the method described in the above patent also has problems such as single disposal object and limited scope of application.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The incineration fly ash in this example comes from the flue gas purification system of Tianjin Shuanggang Waste Incineration Power Plant, and its main chemical composition is shown in Table 1.

[0023] Table 1 The main chemical components of incineration fly ash of Tianjin Shuanggang Waste Incineration Power Plant

[0024] chemical composition

SiO 2

Al 2 o 3

Fe 2 o 3

CaO

MgO

K 2 o

Na 2 o

SO 3

Cl -

Loss on ignition

content(%)

45.05

15.84

4.27

13.28

3.36

2.81

2.26

3.23

1.72

8.28

[0025] The municipal sludge in this example comes from the dewatered sludge of the sewage treatment plant in Tianjin Economic-Technological Development Zone, with a moisture content of 79.6%. The main chemical components are shown in Table 2.

[0026] Table 2 The main chemical components of the dewatered sludge of the sewage treatment plant in Tianjin Economic-Techn...

Embodiment 2

[0036] The incineration fly ash in this example comes from the flue gas purification system of Tianjin Shuanggang Waste Incineration Power Plant, and its main chemical composition is shown in Table 1.

[0037] The municipal sludge in this example comes from the dewatered sludge of Tianjin Jizhuangzi Sewage Treatment Plant, with a water content of 81.4%. The main chemical components are shown in Table 5.

[0038] Table 5 The main chemical components of the dewatered sludge of Tianjin Jizhuangzi Wastewater Treatment Plant

[0039] chemical composition

[0040] The binder bentonite used in this example is a powder body, and its main chemical composition is shown in Table 3.

[0041] Dry the dewatered sludge at 105°C, pulverize it with a pulverizer, and pass it through a sieve with an aperture of 45 μm; mix the fly ash, dry sludge, and bentonite evenly in a mass ratio of 40:50:10; extrude the mixture with a powder tablet press, The molding pressure is 7.5MPa, and a cyli...

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Abstract

The invention discloses a method for preparing ceramsite by utilizing dried sludge and burnt fly ash, belonging to the technology of reduction, harmless treatment and disposal and recycling of dangerous solid waste. The method comprises the following steps of: drying dewatered sludge with moisture content of 75-85% to obtain dry sludge; crushing the dry sludge, and then screening; mixing the screened dry sludge, burnt fly ash and bentonite uniformly according to a certain proportion to obtain a mixture; injecting the mixture into a powder pressing machine for extruding and forming to obtain a blank; preheating the blank at certain time; roasting the blank at high temperature at certain time; and naturally cooling to room temperature to obtain a ceramsite product. Simultaneous reduction, harmless treatment and disposal and recycling of two dangerous wastes of the burnt fly ash and municipal sludge are realized with the method, and the produced ceramsite product conforms to the standard of toxic leaching and meets the requirement of lightweight aggregate of buildings. The method has the advantages of simplicity in process, less investment, low operating cost, large required quantity of the produced ceramsite products and the like.

Description

technical field [0001] The invention relates to the technical field of solid hazardous waste treatment and resource utilization, in particular to a method for preparing ceramsite by using dried sludge and incineration fly ash. Background technique [0002] With the rapid increase of population and the acceleration of urbanization process, the amount of domestic waste generated in my country and the discharge of municipal sewage are increasing day by day. According to statistics, the per capita daily waste generated by urban residents in my country is about 1.2kg, and it is increasing at an annual rate of 8% to 10%. Statistics show that my country's sewage discharge increased from 43.29 billion tons in 2001 to 53.68 billion tons in 2006, with an annual growth rate of 4.39%, of which municipal sewage discharge increased by 30.1%. [0003] At present, the treatment and disposal technologies of municipal solid waste are mainly sanitary landfill, composting and incineration. Wa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/12C04B35/00
Inventor 高亮张曙光徐朝阳郝永俊韩檬杨健董楠董珂
Owner TIANJIN TEDA ENVIRONMENTAL PROTECTION
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