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Fly ash coated sludge ceramsite and preparation method therefor

A technology for sludge ceramsite and fly ash, which is applied to ceramic products, clay products, other household appliances, etc., to achieve the effect of inhibiting escape and reducing production costs

Active Publication Date: 2016-05-04
INST OF PROCESS ENG CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In addition, the present invention not only provides a method for resourceful comprehensive utilization of urban sewage plant sludge and fly ash to prepare fly ash-coated sludge ceramsite, the most important thing is that it can solve the problem of sewage plant sludge outlet pressure, so that The utilization of urban sewage plant sludge is developing in the direction of harmlessness, reduction and resource utilization

Method used

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  • Fly ash coated sludge ceramsite and preparation method therefor
  • Fly ash coated sludge ceramsite and preparation method therefor

Examples

Experimental program
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Effect test

Embodiment 1

[0032] A fly ash-coated sludge ceramsite and a preparation method thereof, comprising the following steps:

[0033] (1) The sludge was dried and pulverized in a drying oven at 110°C, and 45.0g of dewatered sludge, 30.8g of shale, 22.0g of feldspar powder, and 2.2g of silicon carbide were accurately weighed according to the composition ratio. Put the accurately weighed dewatered sludge, shale, feldspar powder and silicon carbide into the mixer and mix evenly to obtain the sludge ceramsite basic mixture;

[0034] (2) Granulate the sludge ceramsite base mixture to make spherical particles with a diameter of 5-20 mm, and then coat a layer of fly ash layer on the surface of the spherical particles to obtain fly ash-coated sludge Ceramsite green body;

[0035] (3) The obtained fly ash-coated sludge ceramsite green body is placed in an oven at 110° C. for drying;

[0036] (4) Sintering the fly ash-coated sludge ceramsite green body in the step (3), the firing system is: heating up ...

Embodiment 2

[0039] A fly ash-coated sludge ceramsite and a preparation method thereof, comprising the following steps:

[0040] (1) The sludge was dried and pulverized in a drying oven at 110°C, and 46.0g of dewatered sludge, 32.8g of shale, 18.7g of feldspar powder, and 2.5g of silicon carbide were accurately weighed according to the composition ratio. Put the accurately weighed dewatered sludge, shale, feldspar powder and silicon carbide into the mixer and mix evenly to obtain the sludge ceramsite basic mixture;

[0041] (2) Granulate the sludge ceramsite base mixture to make spherical particles with a diameter of 5-20 mm, and then coat a layer of fly ash layer on the surface of the spherical particles to obtain fly ash-coated sludge Ceramsite green body;

[0042] (3) The obtained fly ash-coated sludge ceramsite green body is placed in an oven at 120° C. for drying;

[0043] (4) Sintering the fly ash-coated sludge ceramsite green body in the step (3), the firing system is: heating up ...

Embodiment 3

[0046] A fly ash-coated sludge ceramsite and a preparation method thereof, comprising the following steps:

[0047] (1) The sludge was dried and pulverized in a drying oven at 110°C, and 50.0g of dewatered sludge, 31.2g of shale, 16.1g of feldspar powder, and 2.7g of silicon carbide were accurately weighed according to the composition ratio. Put the accurately weighed dewatered sludge, shale, feldspar powder and silicon carbide into the mixer and mix evenly to obtain the sludge ceramsite basic mixture;

[0048] (2) Granulate the sludge ceramsite base mixture to make spherical particles with a diameter of 5-20 mm, and then coat a layer of fly ash layer on the surface of the spherical particles to obtain fly ash-coated sludge Ceramsite green body;

[0049] (3) The obtained fly ash-coated sludge ceramsite green body is placed in an oven at 130° C. for drying;

[0050] (4) Burning the fly ash-coated sludge ceramsite green body in the step (3), the firing system is: heating up to...

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Abstract

The invention relates to fly ash coated sludge ceramsite and a preparation method therefor. According to the fly ash coated sludge ceramsite, sludge serves as a main raw material, shale, feldspar powder and a foamer serve as auxiliary raw materials, and the mixed amount of dry sludge in the raw materials of the ceramsite is 35.0-58.0wt.%. The preparation method comprises the steps of firstly accurately weighing the dry sludge or wet sludge with certain moisture, the shale, the feldspar powder and the foamer according to a designed ingredient proportioning ratio, then, carrying out uniform mixing, granulating the mixture, coating the surface of each unburnt sludge ceramsite with a layer of fly ash, meanwhile, adding a certain volume of fly ash into a rotary kiln, then, carrying out foaming burning on the fly ash coated unburnt sludge ceramsites, and carrying out annealing cooling, thereby obtaining the sludge ceramsite. According to the fly ash coated sludge ceramsite and the preparation method therefor, the ceramsite is prepared by taking the sludge as the main raw material; due to fly ash coated sludge ceramsites, the mutual adhesion among the ceramsites in a dynamic burning process can be effectively prevented, so that the rate of final ceramsite products is increased; and meanwhile, the utilization of the sludge of sewage plants is developed towards a harmless, volume-reducing and resource-converting direction, so that the fly ash coated sludge ceramsite and the preparation method therefor have remarkable economic, environmental and social benefits.

Description

technical field [0001] The present invention relates to a kind of sludge ceramsite and its preparation method, especially to a kind of fly ash coated sludge ceramsite and its preparation method. Artificial lightweight aggregate building materials. Background technique [0002] Sludge from urban sewage treatment plants is an associated product of sewage treatment, with extremely complex composition, large volume, easy corruption and foul smell. With the rapid development of social economy and the continuous improvement of the level of urbanization, the discharge of industrial sewage and urban domestic sewage in our country is increasing day by day, the rate of sewage collection and treatment and the depth of treatment are constantly improving, and the output of sludge is also increasing rapidly at a rate of 10% per year. Increase. Due to the common phenomenon of "heavy water and light mud" in the construction of sewage plants in our country, the treatment of sludge is still...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/02C04B18/02C04B20/00
CPCC04B18/027C04B20/002C04B38/02C04B2235/3463C04B2235/349C04B2235/3826C04B2235/422C04B2235/656C04B2235/6567C04B33/1321C04B33/1352
Inventor 曹建尉赵庆朝王志严明明马连涛温鹏
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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