A method for preparing ecological aggregate by coating and modifying coal gangue
A coal gangue and ecological technology, which is applied in the field of preparation of new building materials, can solve the problems of large market gap, few high-quality lime resources, low output, etc., and achieves the effects of excellent durability, low cost and reduced production cost.
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[0049] In the preparation method of the gelled material, the calcination temperature is 1250° C. and the calcination time is 2 hours.
[0050] The specific surface area of the solid waste-based gelling material is 400-450kg / m 2 .
[0051] Use a 0.08mm square hole sieve to control the residual percentage below 3%.
[0052] Preferably, in parts by mass, the amount of the solid waste-based cementitious material is 10%-20% and the ratio of the massive coal gangue is 1:9-2:8.
[0053] Further preferably, the water-cement ratio of the water consumption to the cementitious material is between 0.28-0.32.
[0054] Further preferably, the coating equipment adopts a disc granulator. Driven by the motor, the disc rotates to drive the gangue block to rotate, spray water while rotating, wait for the surface of the gangue, and then spray solid waste-based gelling material powder. Until the surface of the coal gangue is coated with a uniform and dense shell.
[0055] The method has the...
Embodiment 1
[0064] The above process steps are used for preparation, and the specific parameters, calculation results and tests are as follows: based on the mass of each raw material, solid waste-based active material powder, coal gangue with a particle size of 5-25 mm, and tap water are weighed in a ratio of 1:9:0.28. First, put the weighed lump coal gangue in the disc of the granulator and let it rotate and roll with the disc. Then inject the quantitative water weighed in proportion into the watering can, and spray the solid waste-based cementitious material powder weighed in proportion after the coal gangue surface is wet. Sprinkle water while spraying powder. After the water spraying is completed, take it out and dry it naturally to obtain a coal gangue ecological aggregate with a uniform surface coating. The obtained coal gangue aggregate product has a particle diameter of 5-25mm and a bulk density of 1.28kg / m 3 , apparent density 2830kg / m 3 , in line with relevant indicators, the...
Embodiment 2
[0066] The above process steps are used for preparation, and the specific parameters, calculation results and tests are as follows: based on the mass of each raw material, solid waste-based active material powder, coal gangue with a particle size of 5-25mm, and tap water are weighed in a ratio of 1:8.5:0.29. First, put the weighed lump coal gangue in the disc of the granulator and let it rotate and roll with the disc. Then inject the quantitative water weighed in proportion into the watering can, and spray the solid waste-based cementitious material powder weighed in proportion after the coal gangue surface is wet. Sprinkle water while spraying powder. After the water spraying is completed, take it out and dry it naturally to obtain a coal gangue ecological aggregate with a uniform surface coating. The particle diameter of the obtained coal gangue aggregate product is 5-25mm, and the bulk density is 1.30kg / m 3 , apparent density 2880kg / m 3 , which meet the relevant indicato...
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