Method for preparing coal mine filling paste by utilizing waste concrete
A technology for discarding concrete and coal mines, applied in the field of cemented filling materials, can solve the problems of destroying the ecological environment and occupying land, saving energy, reducing filling costs, and reducing bleeding
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Embodiment 1
[0040] (1) Collect the abandoned building concrete test blocks in the laboratory, sort and remove metal, wood, plastic and waste concrete contaminated by radioactive and heavy metal harmful substances, and then use the jaw crusher to crush the raw materials to make the crushed particles The diameter is mainly distributed below 15mm, and its raw materials are 100kg waste concrete and 50kg coal gangue, and the weight ratio of the two is 1:0.5;
[0041] (2) Sieve the crushed waste concrete and gangue particles with vibrating sieves with meshes of 1mm, 5mm and 15mm to obtain powders less than 1mm, fine aggregates of 1-5mm, and coarse aggregates of 5-15mm. The 15mm particles are sent back for re-crushing;
[0042] (3) Add fly ash and quicklime and gypsum solids mixed at a ratio of 1:0.5 to the powder obtained in step (2) with a particle size of less than 1mm, stir evenly and send it to a ball mill for ball milling, and ball mill for 15 minutes to obtain a ratio Surface area ≥ 300m...
Embodiment 2
[0046](1) Collect the abandoned building concrete test blocks in the laboratory, sort and remove metal, wood, plastic and waste concrete contaminated by radioactive and heavy metal harmful substances, and then use the jaw crusher to crush the raw materials to make the crushed particles The diameter is mainly distributed below 15mm, and its raw materials are 100kg waste concrete and 25kg coal gangue, and the weight ratio of the two is 1:0.25;
[0047] (2) Sieve the crushed waste concrete and gangue particles with vibrating sieves with meshes of 1mm, 5mm and 15mm to obtain powders less than 1mm, fine aggregates of 1-5mm, and coarse aggregates of 5-15mm. The 15mm particles are sent back for re-crushing;
[0048] (3) Add fly ash and quicklime and gypsum solids mixed at a ratio of 1:0.1 to the powder obtained in step (2) with a particle size of less than 1 mm, stir evenly, and then send it to a ball mill for ball milling for 15 minutes to obtain a ratio Surface area ≥ 300m 2 / kg ...
Embodiment 3
[0052] (1) Collect the abandoned building concrete test blocks in the laboratory, sort and remove metal, wood, plastic and waste concrete contaminated by radioactive and heavy metal harmful substances, and then use the jaw crusher to crush the raw materials to make the crushed particles The diameter is mainly distributed below 15mm, and its raw materials are 100kg waste concrete and 100kg coal gangue, and the weight ratio of the two is 1:1;
[0053] (2) Sieve the crushed waste concrete and gangue particles with vibrating sieves with meshes of 1mm, 5mm and 15mm to obtain powders less than 1mm, fine aggregates of 1-5mm, and coarse aggregates of 5-15mm. The 15mm particles are sent back for re-crushing;
[0054] (3) Add fly ash and quicklime and gypsum solids mixed at a ratio of 1:1 to the powder obtained in step (2) with a particle size of less than 1mm, stir evenly and send it to a ball mill for ball milling, and ball mill for 15 minutes to obtain a ratio Surface area ≥ 300m 2...
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