Preparation method for producing lightweight ceramisite from sewage sludge and river sediment through firing

Abstract

A preparation method for producing lightweight ceramisite from sewage sludge and river sediment through firing relates to a preparation method of ceramisite. The method solves the problems of high cost, high density of sintered ceramisite, high water absorption, high hydrochloric acid solubility and low raw material utilization ratio in the preparation of ceramisite. The method comprises the following steps of: 1. drying the sewage sludge and the river sediment; 2. crushing the dried sewage sludge and river sediment, respectively; 3. mixing the crushed sewage sludge particles with the crushed river sediment particles, thereby obtaining a dry mix; 4. mixing an additive and water with the dry mix and then performing extrusion forming on the mixture, thereby obtaining a ceramisite blank; and 5. putting the ceramisite blank in a muffle furnace for sintering, thereby finishing the preparation of the ceramisite. The preparation method has the following advantages that: the sewage sludge and the river sediment are taken as raw materials, so that secondary pollution is effectively prevented and recycling of the sludge and the changing of waste material into things of value are realized; the shortcoming of high cost in ceramisite preparation is overcome; and water glass is further added so that the lightweight ceramisite is high in strength and low in density, and has the advantages of low water absorption, low hydrochloric acid solubility and the like.

Description

technical field [0001] The invention relates to a preparation method of ceramsite. Background technique [0002] Nowadays, due to the increasing amount of sewage treatment, the amount of sludge produced in the process of sewage treatment also increases rapidly correspondingly. The cost of sludge treatment has accounted for a large proportion of the treatment cost of sewage treatment plants. At present, most rivers are polluted to varying degrees, resulting in the enrichment of a large amount of pollutants, especially heavy metals, in the river sediment, which brings certain difficulties to the disposal of the dredged sediment. Therefore, how to dispose of these sewage sludge and river sediments, which are likely to cause environmental pollution, is currently a difficult problem. [0003] At present, the use of sewage sludge or river bottom mud for materialization, such as making concrete fillers, making bricks, making ceramsite, etc., has been studied at home and abroad. ...

AI Technical Summary

Problems solved by technology

However, there is a shortcoming at present that almost all the sludge-made ceramsite used in the study basically uses sludge or river bottom mud as one of the raw material additives, and the utilization rate of the sludge itself is not very high; and even if there is sintered ceramsite There are problems such as high density, high water absorption rate, and high hydrochloric acid soluble rate, which not only restrict the application of ceramsite products, but also seriously limit the development of ceramsite production enterprises.