Process for preparing sludge autoclaved aerated concrete building block

Abstract

The invention belongs to the technical field of environmental engineering, and particularly relates to a process for preparing a sludge autoclaved aerated concrete building block. The process mainly comprises the following steps of: (1) quickly stirring and mixing spare dried sludge, water and lime, coal ash, cement, gypsum and aluminum powder with physical and chemical properties meeting the brick making requirements in a certain ratio and in turn; (2) feeding the mixture obtained in the step (1) into a die, and putting the die into a thermostatic curing box of 40 DEG C or 60 DEG C to perform foaming and curing for 4 hours; (3) putting the blank foamed and cured in the step (2) into an autoclave, and curing the blank for over 8 hours by adopting a stepwise buck-boost curing mode; and (4)piling the product discharged from the autoclave outdoors for over 2 days. The process can reach hazard-free and recycling treatment of urban sludge, save clay resources and save the brick making cost, and has remarkable economic, social and environmental benefits.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering, and in particular relates to a method for preparing sludge autoclaved aerated concrete blocks. Background technique [0002] my country is the world's largest developing country with a large population, and the resulting water pollution is becoming more and more serious. Therefore, water pollution prevention and control has attracted widespread attention. According to the fourth annual series report of China Water Network, it is estimated that by the end of 2010, at least nearly 3,000 sewage treatment plants in my country will be in operation, and a huge amount of sludge will be produced at that time; at the same time, the composition of sludge is complex, and it is a variety of microorganisms. The aggregate formed by the gelatin group and its adsorbed organic matter and inorganic matter contains not only a large amount of water (up to 99%), but also refractory organic matter, he...

AI Technical Summary

Problems solved by technology

[0009] However, these methods have not completely and effectively treated the harmful substances in the municipal sludge, and there are the following problems:

[0011] Through the above analysis, it can be seen that the current sludge disposal methods have some defects, and there is a gap with the national requirements for sludge treatment and disposal, which affects the normal operation of the sewage treatment plant.

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