Phosphorus-based grouting filling material suitable for old goaf treatment

Abstract

The invention discloses a phosphorus-based grouting filling material suitable for old goaf treatment. The phosphorus-based grouting filling material is prepared through the following steps: uniformly mixing, by weight, 40-60 parts of phosphorus slag powder, 30-40 parts of fly ash, 6-10 parts of an active activator and 3-8 parts of an expanding agent, adding the above obtained mixture, 0.5-1.5 parts by weight of a water reducer, 0.5-1 part by weight of a water retaining agent and 30-50 parts by weight of water to a stirring pool, uniformly stirring, adding 100-200 parts by weight of phosphorus tailings, and uniformly stirring. The phosphorus-based grouting filling material has the advantages of fast strength development, high filling efficiency, no shrinkage, and suitableness for long-distance pumping, the initial setting time is not smaller than 70min, the final setting time is not greater than 200min, the initial fluidity is not smaller than 300mm, the 30min fluidity retention value is not smaller than 260mm, the 1d compressive strength is not smaller than 4.9MPa, the 7d comprehensive strength is not smaller than 8.8MPa, the 28d compressive strength is not smaller than 12.9MPa, and the vertical expansion rate is not smaller than 0.1%.

Description

technical field [0001] The invention relates to the technical field of chemical engineering of cement-based cementitious materials, in particular to a preparation method of an alkali-free and chlorine-free accelerator with high aluminum content. Background technique [0002] In the phosphorus chemical industry, a large amount of solid waste—phosphorus slag and mine tailings discharged from yellow phosphorus production are mostly stored in the open air, which not only takes up a lot of land, but also due to the phosphorus, fluorine, and organic matter in the solid waste And other soluble impurities are dissolved out and infiltrated into the soil, leading to land degradation and vegetation destruction, directly threatening the living environment of human beings. The dust generated from phosphorous tailings also seriously pollutes the air in the surrounding areas. The treatment and utilization of these solid wastes is a practical problem that must be solved in the current phos...

AI Technical Summary

Problems solved by technology

CN104556917A discloses an early-strength coal mine goaf filling material, the main components of which are fast-hardening sulphoaluminate cement, fly ash and coal gangue, which have the advantages of high early strength and long-distance pumping, but the cement cost Higher, and the production process pollutes the environment; CN104211313A discloses a phosphogypsum-based cementitious material used for backfilling in mine goafs. dose

Although these two methods utilize a large amount of industrial waste, their strength is too low and their development is slow, they are not suitable for long-distance pumping, and their filling efficiency is too low

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