A method for preparing cement from waste sintered shale
A shale and cement technology, which is applied in the field of cement preparation from waste sintered shale, can solve the problems of easy cracking and poor mechanical properties of ordinary cement, and achieve the problems of easy cracking, increased flexural strength, improved mechanical properties and durability Effect
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Embodiment 1
[0025] A method for preparing cement by using waste sintered shale, the specific steps are as follows:
[0026] ① After crushing waste sintered shale bricks, coal gangue and waste rubber, put them in a drying oven to dry to constant weight, and then grind them to ultra-fine powder respectively to obtain waste sintered shale brick powder, coal gangue powder and waste rubber pink;
[0027] ② Mix and stir the waste sintered shale brick powder and coal gangue powder prepared in step ① in a weight ratio of 50:10, place them in a high-temperature electric furnace at 1000°C, and calcinate them for 2 hours; 30°C environment and 30°C environment for 3 hours each, the number of cycles is 8 times, and the activated ultrafine powder is obtained;
[0028] ③According to parts by weight, mix 150 parts of ordinary Portland cement clinker and 50 parts of 5% dihydrate gypsum and use a ball mill to grind the ultrafine cement to a particle size of 300 mesh; then place the ultrafine cement in a h...
Embodiment 2
[0030] A method for preparing cement by using waste sintered shale, the specific steps are as follows:
[0031] ① After crushing waste sintered shale bricks, coal gangue and waste rubber, put them in a drying oven to dry to constant weight, and then grind them to ultra-fine powder respectively to obtain waste sintered shale brick powder, coal gangue powder and waste rubber pink;
[0032] ② Mix and stir the waste sintered shale brick powder and coal gangue powder prepared in step ① in a weight ratio of 80:20, place them in a high-temperature electric furnace at 1200°C, and calcinate them for 3 hours; 30°C environment and 30°C environment for 3 hours each, the number of cycles is 12 times, and the activated ultrafine powder is obtained;
[0033] ③According to parts by weight, mix 150 parts of ordinary Portland cement clinker and 50 parts of 5% dihydrate gypsum and use a ball mill to grind the ultrafine cement to a particle size of 300 mesh; then place the ultrafine cement in a ...
Embodiment 3
[0035] ① After crushing waste sintered shale bricks, coal gangue and waste rubber, put them in a drying oven to dry to constant weight, and then grind them to ultra-fine powder respectively to obtain waste sintered shale brick powder, coal gangue powder and waste rubber pink;
[0036] ② Mix the waste sintered shale brick powder and coal gangue powder prepared in step ① in a weight ratio of 70:15 and place them in a high-temperature electric furnace at 1100°C for 2.5 hours; take them out and cool them to room temperature, and circulate the prepared ultrafine powder in -30°C environment and 30°C environment for 3 hours each, the number of cycles is 10 times, and the activated ultrafine powder is obtained;
[0037]③According to parts by weight, mix 150 parts of ordinary Portland cement clinker and 50 parts of 5% dihydrate gypsum and use a ball mill to grind the ultrafine cement to a particle size of 300 mesh; then place the ultrafine cement in a high-temperature electric furnace,...
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