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
4 Cites 35 Cited by

AI-Extracted Technical Summary

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 t...
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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.

Application Domain

Technology Topic

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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

Examples

  • Experimental program(16)

Example Embodiment

[0013] Specific implementation mode 1: The preparation method of activated sludge blended with fly ash fire-free ceramsite is carried out in the following steps: 1. Fly ash, cementitious material and admixtures are pretreated according to the mass ratio of 7-9 :6~8:1~3 mix to obtain powder; 2. Mix the sludge of the second settling tank of the municipal sewage plant with the mass of 35%-65% of the cementing material with the powder, and then put it into the pelletizing machine, The pelletizing and granulating machine runs for 30-50min under the conditions of the angle of the pelletizing disc at 45~75° and the rotating speed of 30~70r/min. During the operation, the process of crushing, mixing and pelletizing again needs to be repeated 3~5 Secondly, the ceramsite with a particle size of 5-8mm is obtained; 3. The ceramsite obtained in step 2 is cured by covering a moist straw mat for 14-18 hours to obtain primary ceramsite; fourth, the primary ceramsite is 80-85℃ After 6-10 hours of steam curing, the ceramsite is not burnt, that is, the preparation of the activated sludge blended with fly ash and burn-free ceramsite is completed; the cementing material in step one is Portland cement, and the admixture is quicklime.
[0014] In the first step of this embodiment, the pretreatment is to grind the fly ash, cementitious material and admixtures through a 100-mesh sieve separately; the purpose is to reduce the difference in particle size of different raw materials, and finally make the raw materials mixed. The density and particle size are different and re-layered, avoiding individual differences in the final product.
[0015] The mixing in Step 1 of this embodiment is dry mixing.
[0016] In the first step of this embodiment, the cementing material is Portland cement, which is various types of Portland cement on the market.
[0017] In the second step of this embodiment, the sludge in the second settling tank of the municipal sewage plant is mixed with powder, and then put into the pelletizing machine. A large amount of particles are generated immediately, but at this time, the particles have low strength, different sizes, and mutual adhesion. Repeat the process of crushing, mixing and balling again 3 to 5 times to ensure that the individual ceramsites do not stick to each other.

Example Embodiment

[0018] Specific embodiment two: this embodiment is different from specific embodiment one in that in step one, the fly ash, cementitious material and admixture are pretreated and mixed at a mass ratio of 7:8:3. Other steps and parameters are the same as in the first embodiment.

Example Embodiment

[0019] Specific embodiment three: this embodiment is different from specific embodiment one in that in step one, the fly ash, cementitious material and admixture are pretreated and mixed at a mass ratio of 9:6:1. Other steps and parameters are the same as in the first embodiment.
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PUM

PropertyMeasurementUnit
Particle size5.0 ~ 8.0mm
Particle size6.0mm
Strength>= 5.0MPa
tensileMPa
Particle sizePa
strength10

Description & Claims & Application Information

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