Method for preparing ceramsite from sludge in sewage plant

Abstract

The invention discloses a method for preparing ceramsite by using sludge in a sewage plant, which comprises the following steps: step 1, dewatering municipal sludge, adding a certain amount of cationic polyacrylamide sludge dewatering agent into the sludge, mixing and stirring, and carrying out filter pressing and drying treatment by using a high-pressure membrane filter press to obtain the municipal sludge; 2, selecting raw materials, namely selecting a certain amount of dewatered sludge, kaolin, black clay, pulverized coal ash and plant ash in the step 1, and crushing and grinding; the plant ash and the adhesive are added into the raw materials of the prepared ceramsite, and the plant ash can be fully mixed with the sludge, so that the adhesive property of the ceramsite is effectively improved, the hardness of the prepared ceramsite is improved, and the phenomenon that the ceramsite is dispersed due to water loss in the sintering process is effectively avoided; meanwhile, the plant ash in the ceramsite contains higher potassium carbonate, so that when the ceramsite is used as a fertilizer, the potash fertilizer required by crops can be increased, and the use of the ceramsite prepared from the sludge in agricultural fertilizers is improved.

Description

technical field [0001] The invention relates to a method for preparing ceramsite, in particular to a method for preparing ceramsite from sludge in a sewage plant, and belongs to the technical field of sludge treatment. Background technique [0002] Ceramsite, as the name suggests, is ceramic particles. Most of the appearance characteristics of ceramsite are round or oval spheres, but some imitation gravel ceramsites are not round or elliptical spheres, but irregular gravel shapes, and the shapes of ceramsite vary with different processes. Its surface is a hard shell, which is pottery or enamel, which has the function of water-proof and air-retaining, and gives ceramsite high strength. [0003] When the current sludge is recycled to prepare ceramsite, the prepared ceramsite is widely used, but when the current sludge is used to prepare ceramsite, the adhesion of ceramsite is not strong, and it is prone to loose particles during the sintering process. At the same time, the w...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a kind of method that sewage plant utilizes sludge to prepare ceramsite, to solve the present sludge that proposes in the above-mentioned background technology when preparing ceramsite, the cohesiveness of ceramsite is not strong, in the process of sintering In the middle, the phenomenon of loose particles is easy to appear, and the water absorption rate of the prepared ceramsite is low at the same time.