Foam type stopping agent for preventing mine coal spontaneous combustion and its use method

Abstract

The invention discloses a foam retardant for preventing mine well from spontaneously combusting and a using method thereof. The retardant is characterized in that according to the gross mass of a chemical retardant, 0.5 to 2 percent of oxidizing agent is dissolved in water, and then 1 to 1.5 percent of foaming agent, 0.2 to 0.4 percent of foam stabilizing agent, 0.05 to 0.1 percent of thickening agent and 0.05 to 0.1 percent of emulsifying agent are sequentially added and stirred uniformly so as to prepare the chemical retardant; according to the gross mass of a physical retardant, 10 to 15 percent of inorganic salt and other compositions are added by the same method as the former so as to prepare the physical retardant; when the retardant is used, the chemical retardant is diluted into an aqueous solution with a concentration of between 1.76 and 4.1 weight percent first, and the aqueous solution is sprayed to a target coal layer area; after 30 minutes to 1 hour, the physical retardant which is diluted into an aqueous solution with a concentration of between 11.06 and 16.9 weight percent is sprayed into the same area; and inhibition foams are covered on the surface of the coal layer so as to achieve the effect of preventing the spontaneous combustion for a long time on the coal layer of the area.

Description

technical field [0001] The invention belongs to the technical field of preventing and controlling spontaneous combustion of mine coal, and in particular relates to a foam-type inhibitor containing an oxidizing agent, an inorganic salt and a surfactant and a use method thereof. Background technique [0002] The existing inhibitors for preventing spontaneous combustion of mine coal can be divided into two categories: physical inhibitors and chemical inhibitors. Physical inhibitors are mainly inorganic salts, including sodium chloride (NaCl), calcium chloride (CaCl 2 ) and magnesium chloride (MgCl 2 ) etc.; because these inorganic salts have strong water absorption, when they attach to the surface of coal, they can absorb moisture in the air, thereby reducing the temperature of the coal seam and forming a water-containing liquid film on the surface of coal particles, preventing the coal from contacting oxygen. Contact, play the role of oxygen barrier resistance. Chemical inh...

AI Technical Summary

Problems solved by technology

[0003] Although the traditional method of spraying and pouring inhibitors can play a certain role in the prevention and control of coal spontaneous combustion, it has great limitations, especially for some long and narrow mine roadways, liquid inhibitors (including physical Inhibitors and chemical inhibitors) are sprayed and poured into designated areas, and it is difficult to achieve uniform distribution, and the flame retardant time is also limited; the current method of using the two chemical inhibitors alone is suitable for mines with high requirements for the prevention and control of spontaneous combustion Coal is difficult to achieve effective flame retardant control effect

The existing above-mentioned traditional methods are difficult to achieve ideal prevention and control effects on mine coal with high requirements for spontaneous combustion of coal