Research and Design on Building Mud of Using Hot-pressing Drying Dehydration

Abstract

In the process of urban construction, a large number of mud is produced. But the current treatment and disposal method of building mud has low efficiency and high cost. In order to facilitate the effective treatment of the subsequent mud, mud dewatering need to reduce the processing cost and realize the goal of sludge reduction as an important pre process to meet the requirements of national environmental protection. From the analysis of comprehensive index of energy consumption, investment operation cost of technology and economy, sludge hot-pressing drying technology will be one of the key development areas. Through the analysis of the composition and the dewatering performance of the building mud, the inorganic components were mainly SiO2 and Al2O3, which was similar to the clay and was difficult to deal with.The pilot test was conducted with the method of heating, pressure, adding filter aid, etc. Research showed that the main factors affecting the height of mud cake formation were the mud particle size, the dynamic viscosity, the initial sludge concentration, etc. The effect of heating and pressing was remarkable. By using the similar amplification principle, the mud treatment equipment, which was based on hot-pressing drying technology, was designed. And the mud water content was controlled within 30%.