Method for preparing light porous ceramsite from municipal sewage sludge
A technology for urban sewage and porous ceramics, which is applied in the field of building materials to achieve the effects of simple system, saving energy consumption for sintering, and good social and economic benefits
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Embodiment 1
[0016] The invention provides a method for preparing lightweight porous ceramsite by using urban sewage sludge. First, the raw materials are weighed according to weight percentage: 70% of urban dewatered sludge, 20% of coal gangue powder, 3% of silicon carbide, and 7% of calcium phosphate. Among them, the particle size of coal gangue powder is 500 mesh; the particle size of silicon carbide powder is 500 mesh, and the purity is 96%; the particle size of calcium phosphate powder is 300 mesh, and the purity is 85%. Raw balls with a particle size of 10-20mm are made on a granulator, and the molding pressure is 10Mpa. After molding, they are dried in an air atmosphere at 100°C for 40 minutes, placed in a sintering furnace, and heated slowly at 120°C-600°C for 80 minutes, and then continue to The temperature can be raised to about 1060°C at a speed of 5°C / min and slowly cooled down. The water absorption rate of the obtained ceramsite is 8%, and the bulk density range is 500kg / m 3 ,...
Embodiment 2
[0018] The invention provides a method for preparing lightweight porous ceramsite by using urban sewage sludge. First, the raw materials are weighed according to weight percentage: 80% of urban dewatered sludge, 15% of coal gangue powder, 1% of silicon carbide, 4% of calcium phosphate, Among them, the particle size of coal gangue powder is 600 mesh; the particle size of silicon carbide powder is 400 mesh, and the purity is 98%; the particle size of calcium phosphate powder is 500 mesh, and the purity is 90%. Raw meal balls with a particle size of 10-20mm are made on a granulator, and the molding pressure is 12Mpa. After molding, they are dried in an air atmosphere at 120°C for 40 minutes, placed in a sintering furnace, and heated slowly at 120°C-600°C for 80 minutes, and then continue to The temperature can be raised to about 1060°C at a speed of 5°C / min and slowly cooled down. The obtained ceramsite has a water absorption rate of 10% and a bulk density of 400kg / m 3 , Cylinde...
Embodiment 3
[0020] The invention provides a method for preparing lightweight porous ceramsite by using urban sewage sludge. First, the raw materials are weighed according to weight percentage: 75% of urban dewatered sludge, 18% of coal gangue powder, 2% of silicon carbide, 5% of calcium phosphate, Among them, the particle size of coal gangue powder is 400 mesh; the particle size of silicon carbide powder is 600 mesh, and the purity is 98%; the particle size of calcium phosphate powder is 600 mesh, and the purity is 90%. Raw balls with a particle size of 10-20mm are made on a granulator, and the molding pressure is 8Mpa. After molding, they are dried in an air atmosphere at 110°C for 40 minutes, placed in a sintering furnace, and heated slowly at 120°C-600°C for 80 minutes, and then continue to 8°C / min speed up to about 1060°C and slowly cool down. The water absorption rate of the obtained ceramsite is 8%, and the bulk density range is 450kg / m 3 , Cylinder compressive strength 0.6MPa. Th...
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