Method for preparing sulphoaluminate cement by using fluorine-containing sludge
A technology for sulfoaluminate cement and sludge is applied in the field of environmental engineering, which can solve the problems of waste of resources and occupation of landfill resources, and achieve the effect of saving energy and protecting the environment.
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[0012] Example 1: (1) Solidification and drying of fluorine-containing sludge. The sludge with a large fluorine content obtained from the sewage treatment plant was added with a curing agent and a stabilizer, and then mechanically stirred to make the sludge and The curing stabilizer is mixed uniformly. Obtain solidified fluorine-containing sludge. (2) Production of sulphoaluminate cement; 1) Preparation of raw meal. The raw materials used for sulphoaluminate cement are limestone, alumina and gypsum. The specific proportions are: limestone 45%, Al2O3 25%, SiO2 15%, gypsum 12%, fluorine-containing sludge 3%; 2) Clinker firing, raw meal is generally calcined in a rotary kiln at a temperature of 1300~1400℃ The clinker formation process is as follows: at 950℃, C4A3S and C2AS begin to form; at 1100℃, C2S appears; at 1200℃, C2AS disappears and 2C2S·CaSO appears 4 ; At 1250℃, C2S increases; at 1300~1400℃, 2C2S·CaSO 4 Disappear and the clinker burns. 3) Cement preparation, sulphoalumi...
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[0013] Example 2: (1) Solidification and drying of fluorine-containing sludge. The sludge with a large fluorine content obtained from the sewage treatment plant was added with a curing agent and a stabilizer, and then mechanically stirred to make the sludge and The curing stabilizer is mixed uniformly. Obtain solidified sludge. (2) Production of sulphoaluminate cement, 1) preparing raw meal. The raw materials used for sulphoaluminate cement are limestone, alumina and gypsum. The specific proportions are: limestone 50%, Al2O325%, SiO2 10%, gypsum 14%, fluorine-containing sludge 1%; 2) Clinker firing, raw meal is generally calcined in a rotary kiln, the temperature is 1300~1400℃ During calcination, the clinker formation process is: at 950℃, C4A3S and C2AS begin to form; at 1100℃, C2S appears; at 1200℃, C2AS disappears and 2C2S·CaSO appears 4 ; At 1250℃, C2S increases; at 1300~1400℃, 2C2S·CaSO 4 Disappear and the clinker burns. 3) Cement preparation, sulphoaluminate cement is mi...
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