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Study on Technological Conditions of Red Mud-Coal Gangue Lightweight Pottery Sand

The technological conditions for preparation of red mud-coal gangue lightweight pottery sand were studied. The formulation of the lightweight pottery sand was determined by comparing the sintering images. The results indicated that as to the mixture of red mud and coal gangue, the expansion temperature of mixture decreased with increasing the content of red mud. The composition of 30% red mud and 70% coal gangue was determined to have the best expanding performance in this study and selected. The optimal technological conditions of lightweight pottery sand was systematically studied through orthogonal experiment method and accordingly the lightweight pottery sand with bulk density of 617.89kg/m3, water absorption of 0.14%, the single particle compressive strength of 2.95MPa, the softening coefficient of 0.98 was successfully prepared with the selected composition after preheated at 550°C for 20 min and then sintered at 1300°C for 20min.