Pelletizing method and pelletizing system for sludge ceramsites

Abstract

The invention discloses a pelletizing method and a pelletizing system for sludge ceramsites. The pelletizing method comprises the following steps: sludge is fed into a granulator in an atomization manner, high-speed airflow is adopted for feeding other finely ground raw materials into the granulator, and ball cores with the diameter being smaller than 1 mm are formed after mixed granulation process is completed; the ball cores are fed into a pelletizer for forming mixture balls with the diameter being small than 10 mm, so as to finish primary pelletization; and clay and the mixture balls obtained in the second step are fed into the pelletizer for forming clay coated balls with the diameter being larger than 10 mm, so as to finish secondary pelletization. The clay coated balls formed by adopting the method are characterized in that an outer layer is the clay and an inner layer is a mixture of the sludge, the clay and coal ash. According to method provided by the invention, dewatered sludge discharged from municipal sewage plants is taken as a raw material, no extra water is required to be added, the sludge is prepared into the clay coated balls, and the clay coated balls are placedin a high temperature environment and baked into ceramsites; and the combustibility of organic matters in the sludge is utilized for realizing the combination of internal combustion and external combustion during ceramsite calcination, thereby not only saving the energy, but also avoiding the secondary pollution caused by the prior preparation process of the sludge ceramsites.

Description

technical field [0001] The invention belongs to the technical field of sludge treatment and inorganic non-metallic materials, and particularly relates to a method and a system for pelletizing sludge ceramsite. Background technique [0002] Sludge is an associated product of sewage treatment plants, which is large in volume, large in output, complex in composition, easy to corrupt, and has a foul odor. At present, the main treatment methods are landfill, incineration, etc., but there are problems of secondary pollution. Relatively speaking, the use of high-temperature environments such as cement kilns, boilers in thermal power plants, brick and ceramic kilns, etc. to complete the co-processing of sludge is currently the best treatment method. However, in the process of co-processing, the addition of sludge will affect the production of the original product, especially the presence of a large amount of water in the sludge, which will destroy the balance of the original therma...

AI Technical Summary

Problems solved by technology

[0004] At present, in the industrial production of ceramsite prepared from sludge, due to the high viscosity of sludge, it is difficult to mix well with raw materials such as clay, which limits the increase in the amount of sludge mixed.

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