Fly ash-based cemented filling material and preparation method thereof
A technology for filling materials and fly ash, which is applied in the field of filling materials for mining and their preparation, can solve the problems of high cost, slow solidification, low top connection rate, etc., and achieves the effects of easy operation, significant growth, and reduction of initial investment.
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Example Embodiment
[0020] Specific embodiment one: The fly ash-based cemented filling material of this embodiment ranges from 450 to 485 parts of waste fly ash, 705 to 725 parts of underground waste water, 15 to 20 parts of activator, 4 to 6 parts of lime, 32 parts by mass. ~40 parts of desulfurized gypsum, 11~14 parts of early strength agent, 90~112 parts of sulphoaluminate cement and 128~148 parts of composite Portland cement;
[0021] The activator is one or several mixtures of desulfurized gypsum, alum, water glass and slaked lime;
[0022] The early strength agent is Na 2 CO 3 , NaNO 2 , Na 2 SO 4 , Li 2 CO 3 , Li 2 SO 4 , One or several mixtures of triethanolamine.
[0023] In this embodiment, when the activator and the early-strength agent are a mixture, the components can be mixed in any ratio.
[0024] In this embodiment, fly ash is activated by an activator, and the activated fly ash and an appropriate amount of composite Portland cement can replace part of the sulfoaluminate cement, reducing ...
Example Embodiment
[0025] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the fly ash 45 μm square hole sieve residue is less than or equal to 45%. Other raw materials are the same as in the first embodiment.
[0026] The waste fly ash used in this embodiment is dry or wet discharged fly ash, which is low calcium ash.
Example Embodiment
[0027] Specific embodiment three: This embodiment is different from specific embodiment one or two in that the pH value of the downhole wastewater is 5-14, and the particle size of solid impurities in the wastewater is not greater than 2 cm. Other raw materials are the same as in the first or second embodiment.
[0028] The underground wastewater used in this embodiment is coal mine underground water or metal mine underground water that cannot be directly utilized.
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