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Process for preparing sludge autoclaved aerated concrete building block

A technology of concrete blocks and autoclaved gas filling, applied in the field of environmental engineering, can solve the problems of incomplete and effective treatment of harmful substances and affect the normal operation of sewage treatment plants, so as to protect cultivated land resources, eliminate the spread of epidemic diseases, The effect of increasing porosity

Inactive Publication Date: 2010-10-06
HUNAN UNIV OF SCI & TECH
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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.

Method used

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  • Process for preparing sludge autoclaved aerated concrete building block
  • Process for preparing sludge autoclaved aerated concrete building block
  • Process for preparing sludge autoclaved aerated concrete building block

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Embodiment Construction

[0027] The present invention will be described in further detail below in conjunction with specific embodiments and accompanying drawings.

[0028] First, the sludge with a water content of ≤85% in the sewage treatment plant is mixed evenly with quicklime, ferric chloride solution, and potassium permanganate, and then dried in a dryer, then pulverized by a ball mill, and sieved by a sieving machine for use. Among them, the mass percentages of raw materials are: 89.68% sludge, 10% quicklime, 0.2% ferric chloride solution, 0.12% potassium permanganate, the homogeneous mixture is aerobically digested for 8 hours, and the drying temperature of the dryer is 120 ° C ~ 160 ° C , After sieving with a 0.63mm sieving machine, the standby dried sludge is obtained.

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B28B1/14B28B11/24C04B38/02C04B28/14C02F11/14
CPCC04B28/14Y02W30/91C04B7/00C04B18/08C04B18/305C04B22/04C04B22/064C04B22/08C04B22/12C04B38/02C04B40/0028C04B40/024C04B18/0418
Inventor 任伯帜邓仁建王西峰侯宝林陈文文张良科
Owner HUNAN UNIV OF SCI & TECH
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