Alite crystal modulation process in metasilicate cement clinker
A Portland cement and clinker technology, applied in clinker production, cement production and other directions, can solve the problems of low cement quality and affect the life of concrete projects, and achieve the effect of improving performance and simple and feasible process
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Embodiment 1
[0022] (1) Heat up the prepared Portland cement raw meal to 1450° C. for calcination for 1 hour; cool;
[0023] (2) Heat up at a rate of 5°C per minute, keep warm for 30 minutes when the temperature rises to 1450°C, and then cool naturally;
[0024] (3) The cooled clinker starts to heat up at 800°C, and heats up at a rate of 10°C per minute. When the temperature rises to 1100°C, it is kept for 60 minutes, and then naturally cooled;
[0025] (4) Grind the cooled clinker into a specific surface area of 340m through a ball mill 2 / kg of powder; the XRD patterns of Alite minerals in clinker and the XRD patterns of Alite minerals in the clinker of Xuzhou Huaihai Cement Plant without heat treatment are shown in Figure 1 and Figure 2; as can be seen from the figure, Huaihai cement After the Portland cement clinker in the factory was calcined at 1100°C for 60 minutes and heat-treated, the Alite crystal form changed from M3 to M1.
[0026] (5) Weigh 96g of the final product clinker...
Embodiment 2
[0030] (1) Heat up the prepared Portland cement raw meal to 1480° C. for calcination for 0.5 hours; cool;
[0031] (2) Heat up at a rate of 10°C per minute, keep warm for 60 minutes when the temperature rises to 1500°C, and then cool naturally;
[0032] (3) The cooled clinker starts to heat up at 700°C, and heats up at a rate of 15°C per minute. When the temperature rises to 1000°C, it is kept for 90 minutes, and then naturally cooled; the specific surface area is 350m after being ground by a ball mill. 2 / kg of powder;
[0033] (4) Weigh 96g of the final product clinker, add 4g of gypsum, mix well, add 29ml of water (water-cement ratio w / c=0.29) to stir and shape, the size of the test piece is 20×20×20mm, measure the 3d and 28d compression resistance strength. The test block is first cured in a curing box with a relative humidity of 90% and a temperature of 20±2°C for 24 hours, and then the demoulded test block is placed in a water curing box at 20±1°C for curing. The stre...
Embodiment 3
[0037] (1) Heat up the prepared Portland cement raw meal to 1450° C. for 1 hour for calcination; cool,
[0038] (2) Heat up at a rate of 5°C per minute, keep warm for 60 minutes when the temperature rises to 1450°C, then enter the cooling machine, and cool down at a rate of 55°C per minute;
[0039] (3) When the temperature is cooled to 1000°C, keep it warm for 60 minutes;
[0040] (4) Then cool naturally; the cooled clinker is ground into a specific surface area of 360m through a ball mill 2 / kg of powder;
[0041] (5) Weigh 96g of the final product clinker, add 4g of gypsum, mix well, add 29ml of water (water-cement ratio w / c=0.29) to stir and shape, the size of the test piece is 20×20×20mm, measure the 3d and 28d compression resistance strength. The test block is first cured in a curing box with a relative humidity of 90% and a temperature of 20±2°C for 24 hours, and then the demoulded test block is placed in a water curing box at 20±1°C for curing. The strength compa...
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