Coal-based solid waste grouting fire preventing and extinguishing slurry preparation system

Abstract

The utility model discloses a coal-based solid waste grouting fire preventing and extinguishing slurry preparation system which comprises a material distribution bin, a constant feeder, a vibration classifying screen, a jaw crusher, a belt conveyor, a bucket elevator, a double-roller sand making machine, a middling bin, a ball mill, a drum screen, a recycling chute, a discharging chute, a stirring barrel and a grouting pump. An outlet of the distributing bin is communicated with an inlet of the constant feeder, and an outlet of the constant feeder is communicated with an inlet of the vibration classifying screen; an oversize product outlet of the vibration classifying screen is communicated with an inlet of the jaw crusher, an undersize product outlet of the vibration classifying screen is communicated with an inlet of the rubber belt conveyor through a discharging chute, and an outlet of the jaw crusher is communicated with the inlet of the rubber belt conveyor; an outlet of the belt conveyor is communicated with an inlet of the double-roller sand making machine, an outlet of the double-roller sand making machine is communicated with an inlet of the ball mill, and an outlet of the ball mill is communicated with an inlet of the drum screen; a screen underflow outlet of the drum screen is communicated with an inlet of the stirring barrel, and an outlet of the stirring barrel is communicated with an inlet of the grouting pump.

Description

Technical Field

[0001] The utility model relates to the technical field of coal gangue treatment, in particular to a coal-based solid waste grouting fire prevention and extinguishing slurry preparation system. Background Art

[0002] Coal is my country's basic energy and important raw material. Coal mining faces many safety, environmental protection, ecological and other issues. In recent years, as environmental issues have become increasingly prominent, the concept of green development has gradually gained popularity. Coal mines are facing the main hazards of waste rock discharge, waste rock mountain nature, and fire in the goaf of underground coal mining faces, which have become the main hazards restricting the safe mining of coal.

[0003] In the past, the fire prevention and extinguishing of waste rock piles and underground goafs had the following problems: 1. The accumulation volume of waste rock piles is large, and the fire prevention and extinguishing project is large. After large-scale excavation of waste rock piles, it is easy to form an increased contact area and an increased oxygen content, causing serious fires in the waste rock pile in a short period of time, and the toxic and harmful gases produced have serious impacts on people and the atmosphere; 2. The yellow mud grouting used for fire prevention and extinguishing in underground goafs requires a lot of manpower and material resources for loess, other fire extinguishing materials, slurry equipment, and pipelines after mining in some mines. The high cost often restricts the grouting volume and fails to achieve the effect of fire prevention and extinguishing; 3. Since the disaster gases generated by incomplete combustion in the goaf are all CO, etc., it is easy for on-site personnel to misjudge the root cause of the disaster gas, which leads to the aggravation of the disaster and even triggers other secondary disasters; 4. In the past, for fire prevention and extinguishing in goafs, it was necessary to lay pipelines in advance, but as the working face advanced, a caving area was formed behind the goaf, and maintenance personnel could not reach it. When the pipeline is broken or blocked, grouting operations cannot be carried out in the old goaf. Utility Model Content

[0004] The utility model aims to provide a coal-based solid waste grouting fire prevention and extinguishing slurry preparation system.

[0005] The utility model is implemented by the following technical scheme: a coal-based solid waste grouting fire prevention slurry preparation system, which includes a material distribution bin, a quantitative feeder, a vibrating grading screen, a jaw crusher, a belt conveyor, a bucket elevator, a roller sand making machine, a middle coal bin, a ball mill, a cylindrical screen, a recovery chute, a discharge chute, a mixing barrel, and a grouting pump;

[0006] The outlet of the sub-bin is communicated with the inlet of the quantitative feeder, and the outlet of the quantitative feeder is communicated with the inlet of the vibrating grading screen;

[0007] The outlet of the vibrating grading screen for the oversize material is connected to the inlet of the jaw crusher, the outlet of the vibrating grading screen for the undersize material is connected to the inlet of the belt conveyor through a material discharge chute, and the outlet of the jaw crusher is connected to the inlet of the belt conveyor;

[0008] The outlet of the belt conveyor is communicated with the inlet of the roller sand making machine, the outlet of the roller sand making machine is communicated with the inlet of the ball mill, and the outlet of the ball mill is communicated with the inlet of the cylindrical screen;

[0009] The outlet of the drum screen for the oversize material is communicated with the inlet of the recovery chute, the outlet of the recovery chute is communicated with the inlet of the bucket elevator, the outlet of the bucket elevator is communicated with the inlet of the discharge chute, and the outlet of the discharge chute is communicated with the inlet of the middle coal bunker;

[0010] The outlet of the undersize material of the cylindrical screen is communicated with the inlet of the mixing barrel, and the outlet of the mixing barrel is communicated with the inlet of the grouting pump.

[0011] Furthermore, the ball mill is an overflow ball mill.

[0012] The advantages of the utility model are as follows: the gangue is crushed by a jaw crusher and a double-roller sand making machine for secondary crushing, and the crushed gangue is sent to a ball mill for ball milling, and ground to less than 300 meshes, so that the prepared gangue particles are finer and have strong water permeability, forming gangue slurry. The gangue slurry below 300 meshes has the performance of preventing fire extinguishing, so it can wrap the floating coal in the goaf and the gangue coal in the gangue mountain, effectively isolate the air, and achieve the purpose of preventing fire extinguishing.

[0013] The gangue coal / medium coal screened out by the drum screen is sent to the medium coal bunker by the bucket elevator. Since the gangue content in this part of the gangue coal is low, it can be mixed with commercial coal for sale.

[0014] There is no waste of raw coal in the entire treatment process. At the same time, the gangue is effectively utilized, which reduces the difficulty of gangue treatment and achieves the resource utilization and harmless disposal of coal-based solid waste. The cost and workload of the current yellow mud grouting are saved. According to actual needs, the gangue slurry can be delivered to the goaf or gangue mountain by a grouting pump, and there is no need to lay pipelines in advance. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 It is a structural schematic diagram of the utility model;

[0017] In the figure: material distribution bin 1, quantitative feeder 2, vibrating grading screen 3, jaw crusher 4, unloading chute 5, belt conveyor 6, double roller sand making machine 7, ball mill 8, drum screen 9, recovery chute 10, bucket elevator 11, unloading chute 12, middle coal bin 13, mixing barrel 14, grouting pump 15. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] like Figure 1 As shown, the coal-based solid waste grouting fire prevention and extinguishing slurry preparation system includes a material distribution bin 1, a quantitative feeder 2, a vibrating grading screen 3, a jaw crusher 4, a belt conveyor 6, a bucket elevator 11, a roller sand making machine 7, a middle coal bin 13, a ball mill 8, a cylindrical screen 9, a recovery chute 10, a discharge chute 12, a mixing barrel 14, and a grouting pump 15;

[0020] The outlet of the sub-bin 1 is communicated with the inlet of the quantitative feeder 2, and the outlet of the quantitative feeder 2 is communicated with the inlet of the vibrating grading screen 3;

[0021] The outlet of the vibrating grading screen 3 for the oversize material is connected to the inlet of the jaw crusher 4, the outlet of the vibrating grading screen 3 for the undersize material is connected to the inlet of the belt conveyor 6 through the unloading chute 5, and the outlet of the jaw crusher 4 is connected to the inlet of the belt conveyor 6;

[0022] The outlet of the belt conveyor 6 is connected to the inlet of the double-roller sand making machine 7, the outlet of the double-roller sand making machine 7 is connected to the inlet of the ball mill 8, the outlet of the ball mill 8 is connected to the inlet of the cylindrical screen 9, and the ball mill 8 is an overflow ball mill 8.

[0023] The outlet of the drum screen 9 for the oversize material is connected to the inlet of the recovery chute 10, the outlet of the recovery chute 10 is connected to the inlet of the bucket elevator 11, the outlet of the bucket elevator 11 is connected to the inlet of the discharge chute 12, and the outlet of the discharge chute 12 is connected to the inlet of the middle coal bunker 13;

[0024] The outlet of the cylindrical screen 9 for the undersize material is communicated with the inlet of the mixing barrel 14 , and the outlet of the mixing barrel 14 is communicated with the inlet of the grouting pump 15 .

[0025] The specific operation process of this embodiment is as follows:

[0026] The gangue is crushed by a jaw crusher 4 and a roller sand making machine 7, and then sent to a ball mill 8 for ball milling to a size of less than 300 meshes, so that the prepared gangue particles are finer and have stronger water permeability, forming gangue slurry.

[0027] There is a density difference between the density of the inter-gangue coal and the density of the gangue slurry. The inter-gangue coal is suspended in the slurry and is limitedly affected by the grinding body in the ball mill 8. It maintains a certain shape (larger than the particle size of the gangue slurry) and passes through the cylinder of the ball mill 8 to reach the cylindrical screen 9 at the discharge end of the ball mill 8. After screening by the cylindrical screen 9, the inter-gangue coal / medium coal and gangue in the coal gangue are separated. The gangue slurry can be sent to the mixing barrel 14 for use as a fire-proof material. The gangue slurry below 300 mesh has fire-proof performance, so it can wrap the floating coal in the goaf and the inter-gangue coal in the gangue mountain, effectively isolating the air and achieving the purpose of fire prevention.

[0028] At the same time, the gangue coal / medium coal screened by the drum screen 9 is sent to the medium coal bin 13 by the bucket elevator 11. Since the gangue content in this part of the gangue coal is low, it can be mixed with commercial coal for sale.

[0029] There is no waste of raw coal in the whole processing process, and the gangue is effectively utilized, which reduces the difficulty of gangue processing and saves the cost and workload of using yellow mud grouting at present. The gangue slurry can be sent to the goaf or gangue mountain for use by the grouting pump 15 according to actual needs, and there is no need to lay pipelines in advance.

[0030] Gangue slurry can replace traditional fire prevention and extinguishing materials, making full use of coal-based solid waste to "turn waste into treasure", meeting the requirements of fire prevention and extinguishing above and below the mine, and at the same time, realizing the resource utilization and harmless disposal of coal-based solid waste. It solves the problems of high cost and single process of traditional fire prevention and extinguishing materials. It has obvious economic efficiency, environmental protection efficiency and social efficiency.

[0031] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A coal-based solid waste grouting fire prevention and extinguishing slurry preparation system, characterized in that: It includes material bin, quantitative feeder, vibrating grading screen, jaw crusher, belt conveyor, bucket elevator, roller sand making machine, middle coal bin, ball mill, drum screen, recovery chute, discharge chute, mixing barrel, grouting pump; The outlet of the sub-bin is communicated with the inlet of the quantitative feeder, and the outlet of the quantitative feeder is communicated with the inlet of the vibrating grading screen; The outlet of the vibrating grading screen for the oversize material is connected to the inlet of the jaw crusher, the outlet of the vibrating grading screen for the undersize material is connected to the inlet of the belt conveyor through a material discharge chute, and the outlet of the jaw crusher is connected to the inlet of the belt conveyor; The outlet of the belt conveyor is communicated with the inlet of the roller sand making machine, the outlet of the roller sand making machine is communicated with the inlet of the ball mill, and the outlet of the ball mill is communicated with the inlet of the cylindrical screen; The outlet of the drum screen for the oversize material is communicated with the inlet of the recovery chute, the outlet of the recovery chute is communicated with the inlet of the bucket elevator, the outlet of the bucket elevator is communicated with the inlet of the discharge chute, and the outlet of the discharge chute is communicated with the inlet of the middle coal bunker; The outlet of the undersize material of the cylindrical screen is communicated with the inlet of the mixing barrel, and the outlet of the mixing barrel is communicated with the inlet of the grouting pump.

2. The coal-based solid waste grouting fire prevention and extinguishing slurry preparation system according to claim 1 is characterized in that: The ball mill is an overflow ball mill.

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