Reading guidance：With the increase of sludge production, sludge into the available material, realize the resource utilization of the sludge is particularly important. The use of sewage sludge ceramisite material is a n

    With the increase of sludge production, sludge into the available material, realize the resource utilization of the sludge is particularly important. The use of sewage sludge ceramisite material is a new implementation of sludge resource utilization, to open up new ceramic raw material, has an important significance in the development of new light ceramsite, and city sludge a great amount of production, for the aggregate production can be achieved great economic and environmental benefits. The ceramsite with high strength, thermal insulation sound insulation and fire resistance to chemical corrosion, is used in construction, metallurgy and other industries. In addition, ceramic because of its large specific surface area, high porosity, high mechanical strength, rough surface, strong adsorption ability, has the advantages of good biological compatibility and easy biofilm, wastewater treatment was used as filter material, is widely used. Ceramsite in wastewater treatment mainly as microbial carrier and adsorption The specific surface area is one of the important conventional indicators to evaluate the performance of water treatment filter. The larger the surface area, the more favorable to the adhesion of microorganisms and the effect of the adsorption and retention.  
    Dehydrated sludge ceramisite fabrication can handle the sewage generated in the process of sludge treatment, to achieve the purpose of resource utilization of waste, and the process can make full use of the calorific value of the organic matter in the sludge and reduce the ceramic sintering process cost. At present the ceramic market in China is still mainly to clay ceramsite shale ceramsite, less environmental protection ceramic, the development of high quality dehydrated sludge ceramsite to fill the vacancies in the market, has good prospects for development.
   This study to sewage treatment plant sludge as raw material, the fly ash and bentonite as auxiliary materials, developed a with high specific surface area of light ceramsite. The sintering process to improve the sludge ceramisite fabrication process provides technical support, for the sewage treatment plant sludge processing ideas, to enhance the economic value of sludge at the same time, but also improve the sewage treatment plant sludge treatment enthusiasm.
   1. The influence caused by incineration temperature to ceramic particle’s quality
  A. Ceramic packing density first increased and then decreased with increasing sintering temperature, in the sintering temperature for 1100 degrees Celsius to minimum with sintering temperature continues to rise, bulk density gradually increased. This is because when the temperature is less than 1100 degrees Celsius, ceramic material continuous gasification, but he couldn't break through adhesive formed during the melting of the liquid film, so that the haydite by sintering and expanding, bulk density decreased; when the sintering temperature reaches 1100 degrees Celsius, ceramic bonding agent to the formation of a liquid phase membrane rupture. Therefore, the bulk density and with the increase of sintering temperature increases.
 B. Aggregate ratio surface area increases with the sintering temperature increasing and decreasing. It is because of the higher temperature, liquid phase amount is large and liquid viscosity decreased, the sintering in the formation of liquid phase easier to fill the hole, which makes the gap of the ceramsite roughness lower, so the ratio surface area with increasing temperature decreases. When the sintering temperature reaches 1100 degrees Celsius, after the breakup of the liquid film, ceramic internal voids are more likely to be liquid filling, resulting in specific surface area of the sag.
 C. Ceramic cylinder compressive strength increases gradually with the increase of sintering temperature. When the calcination temperature of 1100, the raw material of bonding agent does not melt, ceramic structure is loose, cylinder compressive strength is very low; and when the temperature continues to rise, sticky adhesive melt cooling, bonding agent to the formation of a liquid phase membrane rupture after ceramsite become more compact, thus cylinder compressive strength increases with the increase of sintering temperature.
   The experimental results show that the relationship between the 3 performance indexes and the sintering temperature is in line with the theory of ceramic sintering, and the sintering temperature is controlled at about 1100 degrees centigrade.
  2. The influence caused by baking to ceramic particle’s quality
   In the process of sintering ceramsite baking stage is a preheating process, this process mainly has 2 functions: one is the raw material of most organic pyrolysis gas removal, the light ceramsite; two is removed from the raw material in the water, avoid heating water evaporation process as a result of rapid burst of raw materials, impact strength properties of sintered body in the curing stage. The free water in the raw material and combined with water is evaporated, and organic matter in raw material can be decomposed, resulting in the release of large amounts of gas to produce ceramic porous structure, the surface of the liquid phase and the expansion of gas dynamic balance, and ultimately the formation of high-quality porous ceramsite. A large number of gas containing substances and fresh sludge in the interior of a huge hole after the gas, sludge drying material is greatly reduced, so as to achieve good results.
  3. the influence caused by the composition of raw materials to ceramic particle’s quality
   In the raw material of producing haydite, fly ash as prop-pant, bentonite as binder.When the prop-pant (fly ash) and binder(bentonite) suitable proportion, ceramsite specific surface area and achieve the optimal cylinder pressure.Too much when the proppant (fly ash), gas break through liquid phase, prop-pant particles between binder agent, lead to ceramsite increasing specific surface area and the cylinder pressure;When binder agent (bentonite) too much, binder agent after liquid molten filling the gap, reduce ceramsite specific surface area, after the melt solidifies hardness is not as good as prop-pant particles, causing ceramsite cylinder pressure is also reduced.
 

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