Fire prevention and extinguishing gel material for mine and preparation method thereof

Abstract

The invention discloses a fire prevention and extinguishing gel material for a mine and a preparation method thereof. The material is formed by mixing a solid mixture and water according to the water-solid ratio of (6-16): 1, wherein the solid mixture is prepared from the following components in parts by weight: 11 to 14 parts of solid water glass, 6 to 8 parts of a coagulant, 12 to 16 parts of fly ash, 10 to 14 parts of an activating agent, 4 to 8 parts of aluminum-magnesium silicate and 40 to 60 parts of sodium bentonite; the modulus of the solid water glass is 2.0 to 2.5; the water-solid ratio is adjusted and the water is added into the solid mixture, so that fire prevention and extinguishing gel with strong water-retaining property, high mechanical strength and adjustable gel forming time is provided; and the gel forming time of the gel can be relatively conveniently adjusted and the wide-ratio requirements of short-distance filling and long-distance conveying are met. The fire prevention and extinguishing gel has a physical moisture-keeping effect and can be used for locking the water injected into coal bodies relatively well; meanwhile, gaps between the coal bodies can be filled and coal-oxygen contact is reduced, so that the combustion of coal is inhibited relatively well.

Description

technical field [0001] The invention relates to the field of coal fire prevention and control, in particular to a mine fire prevention and extinguishing gel material and a preparation method thereof. Background technique [0002] Gel is a special material between solid and liquid. It has the property that solid cannot flow at the macroscopic level, and behaves like a solution at the molecular level. The water-fixing property of the gel can fix a certain amount of water molecules in the colloidal network structure, and reduce the surface temperature of the coal through the evaporation of water; at the same time, it can also adhere to the surface of the coal body to form a dense film to isolate the coal from oxygen. In addition, the gel transported to the fire area can also play the role of filling and plugging, reducing the amount of air that can control the coal in the area and improving the fire prevention and extinguishing efficiency. Therefore, the gel material It is one...

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Problems solved by technology

Although this inorganic gel is cheap, it releases ammonia gas during the preparation of the gel, which has a very pungent odor and endangers the health of underground workers; Insufficiency of too fast glue time, in view of these problems, scholars have conducted extensive research

[0004] Jia Boyu developed an environmentally friendly FA coagulant based on colloid chemistry and Lewis acid-base electron theory, and prepared a new type of amine-free gel with water glass, FA coagulant and fly ash as raw materials. The experimental results show that the material is strong. It is relatively high and no harmful gas is produced during preparation, but the FA coagulant needs to be made into a solution in advance, which is not convenient for the transportation and storage of raw materials

Sui Tao used water, sodium bicarbonate, water glass and fly ash to prepare fly ash fire extinguishing gel. The gelation time of the gel can be controlled by changing the ratio of the coagulant, but whenever the gelation time is adjusted If there is no adjustment, the raw materials need to be re-prepared, which will easily cause waste of raw materials in practical applications.

Wang Xu used CMC cross-linked fly ash to prepare mine fly ash-CMC composite gel. After low-temperature oxidation experiments and plugging tests, it was found that it has good fire prevention and extinguishing effects, but the gelation time is generally long, which is not convenient for short distances. filling

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