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

[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.

[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.

[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.