Filling mining method for preventing spontaneous combustion of coal bearing seam of coal mine and removing hydrogen sulfide

A mining method, hydrogen sulfide technology, applied in the direction of fire prevention, dust prevention, mining equipment, etc., can solve the problems of short stabilization time, large loss, easy flow away, etc., to achieve increased ductility, stable strength, and crack prevention Effect

Inactive Publication Date: 2014-06-18
LIAONING TECHNICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] For a long time, there have always been several major problems in the mining of coal resources: first, there are a lot of toxic gases in coal seam mining, such as hydrogen sulfide and explosive, second, the effect of surface subsidence control is not ideal, and third, the recovery rate of coal seam mining areas is low
The first method is unsatisfactory for goafs with high hydrogen sulfide content. The second method has a short injection distance of liquid absorbent, and the spraying is greatly affected by the spatial layout. , the stabilization time is short and the loss is large
[0004] In addition, the control of surface subsidence is mainly through local mining and filling with consolidation materials. At present, some mining adopts filling roadways and gob-side retaining roadways, but the mining width of retaining roadways is generally smaller than that of filling roadways, resulting in low recovery rate, and the current filling materials Most of them are cement, gangue, fly ash, magnesium powder (expansion agent) and other mixed materials. Due to the high cost of using a large amount of cement, and the filling material is easy to crack under the influence of ground pressure after consolidation, and the control of surface settlement is limited, especially in There will still be large subsidence under buildings and railways, which will seriously affect the safety of surface facilities in mining areas

Method used

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  • Filling mining method for preventing spontaneous combustion of coal bearing seam of coal mine and removing hydrogen sulfide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0026] A filling mining method for preventing spontaneous combustion of coal-bearing seams in coal mines and removing hydrogen sulfide, the specific steps are:

[0027] (1) Excavate the air inlet lane 2 and the air return lane 1 at a distance of 1-1.5m from the coal seam floor. The air inlet lane 2 and the air return lane 1 are arranged in parallel. One end of the two roadways is connected to the working surface, and the other One end is respectively connected to the main air inlet lane 5 and the main air return lane 6, and a connecting lane 4 is arranged at the connection between the air inlet lane 2 and the main air inlet lane 5, and the air return lane 1 and the main return air lane 6. The connecting lane 4 It is perpendicular to the air inlet lane 2 and the air return lane 1, and a damper is set in the connection lane 4 to form an air inlet and exhaust system in the mining area;

[0028] (2) According to the conditions of the mining area, design the mining width of the fil...

Embodiment 2

[0037] Example 2 is the same as Example 1, except that in the liquid foam with hydrogen sulfide removal and flame retardant functions, the hydrogen sulfide alkaline absorbent is sodium bicarbonate, potassium bicarbonate and calcium bicarbonate. Mixture, accounting for 0.5% of the total mass of the liquid foam, the inorganic salt inhibitor is a mixture of zinc chloride and sodium chloride, accounting for 20% of the total mass of the liquid foam, and the composite blowing agent is anionic-nonionic surface active Agent compound system, accounting for 35% of the total mass of the liquid foam, in which the anionic surfactant is a mixture of Φ-ester sodium sulfonate and alkyl sulfosuccinate, accounting for 60% of the mass of the composite foaming agent, non-ionic surface active agent The active agent is a mixture of polyoxyethylene alkylamine and sodium alcohol ether sulfate, which accounts for 40% of the composite blowing agent quality, and the auxiliary agent accounts for 15% o...

Embodiment 3

[0039] Example 3 is the same as Example 1, except that in the liquid foam with hydrogen sulfide removal and flame retardant functions, the hydrogen sulfide alkaline absorbent is sodium hydroxide, which accounts for 60% of the total mass of the liquid foam , the inorganic salt inhibitor is sodium carbonate, accounting for 10% of the total mass of the liquid foam, and the composite blowing agent is an anionic-nonionic surfactant compound system, accounting for 0.1% of the total mass of the liquid foam, Among them, the anionic surfactant is sodium acyl oxane sulfonate, accounting for 99.5% of the mass of the composite blowing agent, and the nonionic surfactant is a mixture of polyoxyethylene ether and ammonium lauryl polyoxyethylene ether sulfate, accounting for 99.5% of the composite blowing agent. 0.5% of the mass, the auxiliary agent accounts for 5% of the total mass of the liquid foam, specifically a foam stabilizer and a solubilizer, and the foam stabilizer is that the ratio ...

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Abstract

The invention belongs to the field of coal mining safety, and particularly relates to a filling mining method for preventing spontaneous combustion of a coal bearing seam of a coal mine and removing hydrogen sulfide. According to the filling mining method, the positions 1-1.5 m away from a coal floor are excavated to form an air intake roadway and an air return roadway, the mining width of a filling roadway and the mining width of a remained roadway along a gob are designed, and the filling roadway is mined by adopting a coal cutter; after recovery of each layer is finished, liquid foam with the function of removing hydrogen sulfide and retarding flames is sprayed onto the coal seam immediately, and the gob of the filling roadway is filled with filling material slurry. By means of the filling mining method, in a mining process, harmful gas is effectively prevented from injuring people or exploding; besides, it is prevented that strength is reduced because filling materials crack after being solidified, the recovery rate is increased, mining efficiency is improved, waste is utilized, and mining cost is lowered; the filling mining method is particularly suitable for the thick coal seam out of which a great deal of hydrogen sulfide overflows.

Description

technical field [0001] The invention belongs to the field of coal mining safety, and in particular relates to a filling mining method for preventing spontaneous combustion of coal-bearing seams of coal mines and removing hydrogen sulfide. Background technique [0002] For a long time, there have always been several major problems in the mining of coal resources: first, there are a lot of toxic gases in coal seam mining, such as hydrogen sulfide, which is explosive; second, the effect of surface subsidence control is not ideal; [0003] At present, the main methods for removing hydrogen sulfide in mines are: establishing an independent ventilation system to dilute or drain hydrogen sulfide, instilling or spraying hydrogen sulfide absorption solution. The first method is unsatisfactory for goafs with high hydrogen sulfide content. The second method has a short injection distance of liquid absorbent, and the spraying is greatly affected by the spatial layout. , the stabilizati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21F5/04E21F5/06
Inventor 杨森孙凯孟亚雯杨绍斌
Owner LIAONING TECHNICAL UNIVERSITY
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