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Method for preparing haydite from wet sludge and incineration fly ash

A technology for incinerating fly ash and ceramsite, applied in applications, ceramic products, household appliances, etc., can solve the problems of restricted popularization and promotion, single disposal object, limited application scope, etc., to achieve large demand in the construction industry and reduce defective products. rate, and the effect of preventing bursting

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.
At present, the method of using sludge to prepare ceramsite mainly uses dried sludge as raw material, but the process of sludge drying is complicated and the investment and operation costs are high, which seriously limits the popularization and promotion of this method.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 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.

[0022] Table 1 The main chemical components of incineration fly ash of Tianjin Shuanggang Waste Incineration Power Plant

[0023] 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

[0024] 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.

[0025] Table 2 Main chemical components of dewatered sludge from sewage treatment plants in Tianjin Economic-Technological De...

Embodiment 2

[0035] 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.

[0036] 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.

[0037] Table 5 The main chemical components of the dewatered sludge of Tianjin Jizhuangzi Wastewater Treatment Plant

[0038] chemical composition

[0039] The bentonite used in this example is in powder form, and its main chemical composition is shown in Table 3.

[0040] Mix the dewatered sludge, fly ash, and bentonite evenly according to the mass ratio of 15:5:2, and then extrude them with a screw granulator; the molding pressure is 6.5MPa, and a cylinder with a diameter of about 2cm and a height of about 1cm is obtained; after molding, the blank is passed throug...

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Abstract

The invention discloses a method for preparing haydite from wet sludge and incineration fly ash, belonging to solid hazardous waste treatment and recycling technology. The method comprises the following steps: proportionally and uniformly mixing municipal sludge of which the water content is 75-85%, incineration fly ash and bentonite; carrying out extrusion forming on the mixture to obtain a haydite blank; drying the blank for a period of time; preheating the blank for a period of time; roasting the blank at high temperature for a period of time; and naturally cooling to room temperature to obtain the haydite product. In the invention, the wet sludge (municipal sludge of which the water content is 75-85%) and other raw materials are directly mixed, formed and granulated; and thus, the invention avoids the problem of sludge drying, and facilitates forming and granulation based on the viscosity of the wet sludge. The invention has the advantages of simple process, low investment, low operating cost, high demand for the haydite product and the like, thereby having wide development prospects and high popularization value.

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 wet 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. Wast...

Claims

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Application Information

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IPC IPC(8): C04B38/00
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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