The Study And Preparation Of Environmental Simple Brick

In order to utilize industrial solid wastes, environmental simple bricks with high performances were made from industrial solid wastes such as red mud, fly ash and poor clay shale as main raw materials in this paper. Some additives were used to improve the properties, and pressing and extruding were used respectively.By the test of performances and microstructure of raw materials including red mud, fly ash and poor clay shale, the results show that bricks are not made only from red mud because of its chemical composition (the content of SiO2 and Al2O3 are too low and the content of CaO is too high), but only from fly ash and poor clay shale respectively.By the test of performances and microstructure of samples in the system of the initial simple bricks, it was found that the samples were deformed notable when the content of the red mud was more than 80%.In addition, the results show that the porosity of the sample is 43.03%, the bending strength is 66.83MPa and the compression strength is 108.58MPa., when the content of the red mud is 40%.By the test of performances and microstructure of samples in the system of the K₂O-MgO-Al₂O₃SiO₂ simple bricks, the results show that the porosity of the sample is 61.21%, the compression strength is 21.26MPa, when the content of the red mud is 70%.In addition, the result that the performances of the samples were declined remarkably when the content of the red mud is added more than 80% is proved.By the test of performances and microstructure of samples in the system of the K₂O-MgO-Al₂O₃-SiO₂ simple bricks, the results show that the porosity of the sample is 60.27%, the bending strength is 37.92MPa and the compression strength is 54.9 IMPa, when the content of the red mud is 70%. And it is found that the performances and fired temperatures are affected by the formation pressure and reasonable size-grading grogs are improved the deformation and crack of the samples.By the primary study of the simple bricks that were made by extrusion, the plasticity and drying sensitivity of the bodies were remarkably affected by the ageingtimes. The plasticity of the bodies were the best when the ageing times were two days and the drying sensitivity of the bodies were good when the ageing times were not more than four days.