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Method for preparing non-sintered ceramsite from activated sludge blended with fly ash

A technology of activated sludge and fly ash, which is applied in the direction of ceramic products, manufacturing tools, ceramic molding machines, etc., can solve the problems of large pollution, high cost of ceramsite, high density of non-fired ceramsite, etc., and achieve low cost and high density Lightweight, high porosity effect

Active Publication Date: 2012-02-15
HARBIN INST OF TECH
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  • Description
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  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problems of high cost, heavy pollution and high density of unfired ceramsite in the preparation of ceramsite by sintering method, and to provide a preparation method of activated sludge mixed with fly ash unfired ceramsite

Method used

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  • Method for preparing non-sintered ceramsite from activated sludge blended with fly ash
  • Method for preparing non-sintered ceramsite from activated sludge blended with fly ash

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specific Embodiment approach 1

[0013] Specific embodiment one: the preparation method of activated sludge blending fly ash unfired ceramsite in this embodiment is carried out according to the following steps: 1. After pretreatment, fly ash, cementitious material and admixture are carried out according to mass ratio 7~9 : 6~8: 1~3 mixes, obtains powder; 2, the secondary settling tank sludge of urban sewage plant with 35%~65% of cementitious material quality is mixed with powder, then puts into the ball granulator, Under the condition that the angle of the ball forming disc is 45-75° and the rotation speed is 30-70r / min, the ball-forming granulator runs for 30-50 minutes. During the operation, the process of crushing, mixing and re-balling needs to be repeated for 3-5 The second step is to obtain ceramsite with a particle size of 5-8mm; 3. The ceramsite obtained in step 2 is cured for 14-18 hours by covering the wet straw mat to obtain the primary ceramsite; Steam curing for 6 to 10 hours to obtain unfired ce...

specific Embodiment approach 2

[0018] Embodiment 2: The difference between this embodiment and Embodiment 1 is that in step 1, the fly ash, the cementitious material and the admixture are pretreated and then mixed in a mass ratio of 7:8:3. Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0019] Embodiment 3: This embodiment is different from Embodiment 1 in that in step 1, the fly ash, cementitious material and admixture are pretreated and then mixed in a mass ratio of 9:6:1. Other steps and parameters are the same as those in Embodiment 1.

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Abstract

A method for preparing a non-sintered ceramsite from activated sludge blended with fly ash relates to a preparation method of ceramsite and solves problems of high costs, huge pollution and large density of non-sintered ceramsite prepared by a sintering method. The method comprises steps of: 1. pretreating and mixing fly ash, gelling material and additive to obtain a powder; 2. mixing sludge froma secondary clarifier of a municipal sewage factory with the powder, putting into a balling comminutor to obtain the ceramsite; 3. curing the ceramsite by covering a moistening straw mat to obtain a first curing ceramsite; 4. curing the first curing ceramsite with steam. The invention employs sludge from the secondary clarifier of a municipal sewage factory and combusted fly ash from thermal power plant as raw materials to realize resource utilization and overcome disadvantages of high costs and severe pollution of the sintering method for preparing ceramsite; because of addition of sludge, the ceramsite has advantages of light unit weight high and increased amount of porosity reaching 45-60%, and can load a large biomass when used as a carrier in a processing engineering.

Description

technical field [0001] The invention relates to a preparation method of ceramsite. Background technique [0002] China is a large coal-producing country in the world. So far, the output of fly ash as the largest industrial waste has exceeded 100 million tons. The discharge of fly ash not only occupies land resources and causes a waste of funds, but more importantly, it causes serious air pollution, soil pollution and water pollution, endangering the natural environment and human health. Therefore, it has obvious research value and social significance to carry out comprehensive research on fly ash and rationally reuse fly ash that is discharged at will for the protection of resources, the protection of the environment, and the benefit of mankind. [0003] In the process of sewage treatment, a large amount of sludge is produced, which accounts for about 0.3% to 0.5% of the treated water (based on a water content of 97%). With the economic development and the enhancement of e...

Claims

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Application Information

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IPC IPC(8): C04B38/00C04B28/04C04B18/30B28B1/00
CPCY02W30/91
Inventor 马放黄旭邱珊徐善文刘子述
Owner HARBIN INST OF TECH
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