Preparation method for multiphase gel foam for controlling coal autogeneous combustion

Abstract

The invention relates to a preparation method of multi-phase gel foam for controlling the spontaneous combustion of coal. The multi-phase gel foam with multiple components of medium is made by adding a slight amount of thickener into the fly ash or the yellow mud slurry to form thickening mud with certain viscosity, adding certain amount of cross-linking agent and foaming agent into the thickening mud, and introducing nitrogen to carry out the physical and mechanical foaming. The bubble wall of the multi-phase gel foam has high viscosity and good elasticity, the fly ash or yellow mud adhere to the bubble wall, and the bubble is internally covered with nitrogen. The multi-phase gel foam is delivered to the mined-out area through the grouting pipeline of the mine, evenly covers the float coal in the mined-out area, and blocks the fractures of the coal body. The method can effectively hinder the oxygen absorption for goal and prevent the oxidization of the coal. The preparation method is simple, and the prepared multi-phase gel foam has low cost and significant effects on fire prevention and extinguishing; the preparation method does not only have the advantages of mud injection, nitrogen injection, two-phase foam injection, gel injection and composite gel injection on fire prevention and extinguishing, and also overcomes the deficiency, which has wide practicality.

Description

technical field [0001] The invention relates to a method for preparing a multiphase gel foam, in particular to a method for preparing a multiphase gel foam for preventing and controlling coal spontaneous combustion. Background technique [0002] Coal spontaneous combustion is one of the main spontaneous combustion disasters in coal mining in my country. In recent years, the fully mechanized top coal caving technology has been vigorously promoted and applied, which has greatly improved the production efficiency of coal mines. However, this coal mining method has a large caving height, a large amount of residual coal left in the goaf, and serious air leakage, which makes the mine coal spontaneously ignite. Happens frequently. my country's Xinjiang, Ningxia, Inner Mongolia and other provinces still have large-scale coalfield fires, which burn 10-13.6 million tons of coal every year, and the economic loss exceeds 20 billion yuan. Spontaneous combustion of coal produces a large...

AI Technical Summary

Problems solved by technology

At the same time, for mines where coal spontaneous combustion and gas hazards coexist, if the prevention and control of coal spontaneous combustion is not in place, it is easy to cause a gas explosion due to the spontaneous combustion of coal, resulting in particularly heavy casualties and economic losses

For the control of coal spontaneous combustion, fire prevention and extinguishing technologies such as grouting, nitrogen injection, spraying inhibitors, gel injection and composite colloids are usually used: with grouting technology, the grout only flows along the low terrain in the goaf and cannot cover it evenly The coal body cannot be piled up at a high place, and it is easy to form a "ditch" phenomenon; using nitrogen injection technology, because it is difficult to form a closed space, nitrogen is easy to escape with air leakage, and its ability to extinguish and cool down is also weak; using spraying inhibitor technology, Inhibitors corrode underground equipment and endanger workers' physical and mental health, and the fire prevention effect is not very ideal; using gel injection and composite colloid technology, the flow rate is small, the cost is high, and the diffusion range is small