A method of disposal of graphite tailings

Abstract

The application discloses a graphite tailing disposal method, belongs to the tailing treatment technical field, and aims to solve the problems of large pipeline engineering quantity, a large amount of work needing to be done in the underground mine, high filling cost and time-consuming and laborious caused by the filling pipeline arranged in the production line of the underground mine for filling the goaf. The drilling sequence is installed, the filling device is used to fill the mine material slurry into the abandoned coal mine goaf from the previous filling well, the suction device is used to suck the accumulated water from the second filling well, a pressure loop is formed in the filling process, the mine material slurry is filled into the abandoned coal mine goaf in the pressure loop, the filling degree of the tailing is judged by testing whether the accumulated water contains the graphite tailing slurry, and the ground filling is achieved to overcome the defects of the underground filling.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of tailings treatment, and particularly relates to a disposal method of graphite tailings. BACKGROUND

[0002] The part of the product of the sorting operation of ore dressing that has a low content of useful target components and cannot be used for production is called tailings. Graphite tailings are mainly composed of quartz, aluminum oxide, calcium oxide and magnesium oxide, and although they have a certain utilization value, the utilization cost is high and the conversion rate is low, so that the current disposal method of the tailings sorted out by graphite ore dressing is still to be piled up on the ground, which not only occupies land resources, but also pollutes the environment.

[0003] The coal mine goaf is the underground space left after mining, and if not filled, it will cause ground subsidence. Filling the goaf can reduce ground subsidence and eliminate instability factors.

[0004] Using graphite tailings as filling aggregate to fill the coal mine goaf is not only a method to solve the land occupation of graphite tailings, but also a method to fill the coal mine goaf.

[0005] At present, the technology of disposing tailings in the form of filling is mainly applied underground. Graphite tailings are used as the main filling material and mixed with a cementing agent to arrange a filling pipeline in the underground mine production line of the coal mine goaf, and the filling pipeline is used for filling to realize the solidification and filling of the goaf. This method has the advantages of small loss rate, low dilution rate and high safety. With the development of filling mining technology, especially cemented filling mining technology, many complex technical problems of mines have been well solved. However, the engineering quantity of arranging the filling pipeline is large, and a large amount of work needs to be done underground in the mine, which makes the filling cost high and time-consuming. SUMMARY

[0006] The purpose of the present application is to provide a disposal method of graphite tailings to solve the problem that when disposing graphite tailings, the coal mine goaf is filled by arranging a filling pipeline in the underground mine production line of the coal mine goaf, the engineering quantity of arranging the filling pipeline is large, a large amount of work needs to be done underground in the mine, and the filling cost is high and time-consuming. The technical scheme adopted by the present application is as follows:

[0007] A disposal method of graphite tailings, comprising the following steps:

[0008] Step 1: using geophysical exploration technology to explore the current rock occurrence state, stratum break structure and stratum sequence change of the abandoned coal mine goaf;

[0009] Step 2: analyzing and researching the influencing factors of filling the abandoned coal mine goaf;

[0010] Step 3: determine the fillability evaluation criteria;

[0011] Step 4: according to the influencing factors of step 2, the feasibility of filling the abandoned coal mine goaf is comprehensively analyzed and evaluated, and the feasibility of the graphite tailings as filling aggregate is researched through the fillability evaluation criteria of step 3;

[0012] Step 5: according to the analysis and research results of step 2, the aggregate category, the concentration of the mineral material slurry, the pumping pressure parameters of the filling device, the filling radius and the displacement of the suction device are determined;

[0013] Step 6: the position of the first underground filling well without hydraulic connection is determined on the surface within the range of the abandoned coal mine goaf, and the position of the second filling well is determined by taking the filling radius as the distance from the first filling well;

[0014] Step 7: according to the method of step 6, the position of the next filling well is determined by taking the filling radius as the distance from the previous filling well, and a plurality of filling wells are drilled in this way;

[0015] Step 8: when the first filling well is used for filling, the second filling well is used for pumping and pressure relief, the mineral material slurry is filled into the abandoned coal mine goaf from the first filling well through the filling device, and the accumulated water is pumped from the second filling well through the suction device, so as to form a pressure loop in the filling process, so that the mineral material slurry completes directional filling of the abandoned coal mine goaf in the pressure loop, and the filling degree of the abandoned coal mine goaf is judged by testing whether the accumulated water extracted contains graphite mineral material slurry;

[0016] Step 9: after the first filling well completes filling, it is closed and treated;

[0017] Step 10: according to the drilling order of the filling wells, the mineral material slurry is filled into the coal mine goaf from each filling well in turn according to the method of step 8, and when the previous filling well is used for filling, the next filling well is used for pumping and pressure relief, until the overall filling of the abandoned coal mine goaf is completed.

[0018] Further, the filling device comprises a feeder, a mixing bin, a booster and a filling pipe connected in sequence.

[0019] Further, the feeder is a screw conveyor or a bucket elevator.

[0020] Further, the booster is a mud pump.

[0021] Further, the suction device is a water pump.

[0022] Compared with the prior art, the beneficial effects of the present application are:

[0023] 1. The purpose of the present application is to overcome the shortcomings of the prior art, realize the filling of graphite tailings slurry from the ground to the abandoned coal mine goaf through the filling well, and solve the problems of large amount of filling pipe arrangement engineering and a large amount of work needing to be done in the underground mine, high filling cost and time-consuming by reasonably determining the drilling position of the filling well.

[0024] 2. The method cooperates to complete the material replacement in the goaf by other filling wells for pressure relief to realize the directional filling of graphite tailings slurry in the goaf, solve the problems of uncontrolled graphite tailings filling slurry flow and unknown filling degree, realize the consumption of a large amount of graphite tailings, reduce the land occupation area of graphite tailings, reduce the management cost and environmental pollution, avoid disasters and accidents, promote the survival and development of graphite enterprises, change the abandoned land of coal mine goaf into planned land, and restore the ecological environment of the mine. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a structural schematic diagram of the present application;

[0026] Figure 2 is a structural schematic diagram of the filling device.

[0027] In the figure: 1-filling device, 11-feeder, 12-mixing bin, 13- booster, 14-filling pipe, 2-suction device, 3-filling well, 4-abandoned coal mine goaf. DETAILED DESCRIPTION

[0028] To make the purpose, technical scheme and advantages of the present application more clear and explicit, the present application will be described below through specific embodiments shown in the drawings. However, it should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present application. In addition, in the following description, the description of known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present application.

[0029] The connection mentioned in the present application is divided into fixed connection and detachable connection. The fixed connection, i.e. non-detachable connection, includes but is not limited to conventional fixed connection modes such as flange connection, rivet connection, adhesive connection and welding connection. The detachable connection includes but is not limited to conventional detachable modes such as bolt connection, buckle connection, pin connection and hinge connection. When the specific connection mode is not explicitly limited, at least one connection mode can be found in the existing connection mode to realize the function, which can be selected by the person skilled in the art as needed. For example, the fixed connection selects welding connection, and the detachable connection selects bolt connection.

[0030] The present application will be further described in detail below with reference to the drawings. The following embodiments are an explanation of the present application, and the present application is not limited to the following embodiments.

[0031] Embodiment: As shown in Figure 1 , 2 A disposal method of graphite tailings, comprising the following steps:

[0032] Step 1: The current rock occurrence state, stratum break structure and stratum sequence change of the abandoned coal mine goaf 4 are explored by using geophysical exploration technology;

[0033] Step 2: The influencing factors of filling the abandoned coal mine goaf 4 are analyzed and researched, specifically, the two-dimensional profile of apparent resistivity obtained by step 1 is used to analyze the influencing factors of filling the abandoned coal mine goaf 4, such as the spatial occurrence state, whether there is a geological structure water channel, the occurrence structure and stress state of the broken block in the abandoned coal mine goaf 4, etc., to determine the range of the goaf and select the region with relatively independent hydraulic connection;

[0034] Step 3: The evaluation standard of fillability is determined, specifically, the physical and chemical properties and composition of graphite tailings are determined, the stability of the tailings suitable for filling aggregate is analyzed, different filling materials and active excitation are prepared, the filling slurry is selected by using ICAR rheometer, and the flowability, bleeding rate and compressive strength of the slurry under different concentrations are determined. Under the conditions of meeting the requirements of injectability, diffusion range and stone strength, the flowability, bleeding rate, initial and final setting time, and 28d uniaxial compressive strength are determined;

[0035] Step 4: The feasibility of filling the abandoned coal mine goaf 4 is comprehensively analyzed and evaluated according to the influencing factors of step 2, and the feasibility of using graphite tailings as filling aggregate is researched according to the evaluation standard of fillability of step 3;

[0036] Step 5: According to the analysis and research results of step 2, the aggregate type, concentration of mineral aggregate slurry, pumping pressure parameters of filling device 1, filling radius and displacement of suction device 2 are determined;

[0037] Step 6: The position of the first underground filling well 3 without hydraulic connection is determined on the surface within the range of the abandoned coal mine goaf 4, and the filling radius is used as the distance from the first filling well 3 to determine the position of the second filling well 3;

[0038] Step 7: According to the method of step 6, the filling radius is used as the distance from the previous filling well 3 to determine the position of the next filling well 3, and several filling wells 3 are drilled in this way;

[0039] Step 8: when the first filling well 3 is used for filling, the second filling well 3 is used for pumping pressure relief, the mine material slurry is filled from the first filling well 3 to the abandoned coal mine goaf 4 through the filling device 1, and the water pumping is carried out through the second filling well 3, so that the pressure loop is formed in the filling process, the mine material slurry is filled to the abandoned coal mine goaf 4 in the pressure loop, and the filling degree of the abandoned coal mine goaf 4 is judged by testing whether the pumped water contains the graphite mine material slurry;

[0040] Step 9: after the filling of the first filling well 3 is completed, the first filling well 3 is closed;

[0041] Step 10: according to the drilling sequence of the filling well 3, the mine material slurry is filled to the coal mine goaf in sequence according to the method of step 8, when the previous filling well 3 is used for filling, the subsequent filling well 3 is used for pumping pressure relief, until the overall filling of the abandoned coal mine goaf 4 is completed.

[0042] The filling device 1 comprises a feeder 11, a stirring bin 12, a booster 13 and a filling pipe 14 connected in sequence.

[0043] The feeder 11 is a screw conveyor or a bucket elevator.

[0044] The booster 13 is a mud pump.

[0045] The pumping device 2 is a water pump.

[0046] The purpose of the present application is to overcome the shortcomings of the prior art, realize that the graphite tailing mine material slurry is filled from the ground to the abandoned coal mine goaf through the filling well, reasonably determine the drilling position of the filling well, and realize that the coal mine goaf is filled by arranging the filling pipe in the underground mine production line of the coal mine goaf 4, the pipe arrangement engineering quantity is large, and a large amount of work needs to be done in the underground mine, the filling cost is high and the work is time-consuming and laborious.

[0047] And the method cooperates with the material replacement in the goaf by pumping the water in the goaf through the other filling well 3 for pressure relief, realizes the directional filling of the goaf by the graphite tailing mine material slurry, solves the problems that the flow direction of the graphite tailing filling slurry is not easy to control and the filling degree is unknown, realizes the consumption of a large amount of graphite tailing, reduces the land occupation area of the graphite tailing, reduces the management cost and environmental pollution, avoids disasters and accidents, promotes the survival and development of coal enterprises, changes the abandoned land of the coal mine goaf into a planned land, and restores the ecological environment of the mine.

[0048] The above examples are only illustrative of the patent, and do not limit the protection scope thereof, and the person skilled in the art can also change part of it, as long as it does not exceed the spirit and essence of the patent, and is within the protection scope of the patent.

Claims

1. A method of disposal of graphite tailings, characterized by, The method comprises the following steps: Step 1: exploring the current rock occurrence state, stratum break structure and stratum sequence variation of the abandoned coal mine goaf (4) by using geophysical exploration technology; Step 2: analyzing and researching the influencing factors of filling the abandoned coal mine goaf (4); Step 3: determining the fillability evaluation standard; Step 4: comprehensively analyzing and evaluating the feasibility of filling the abandoned coal mine goaf (4) according to the influencing factors of Step 2, and researching the feasibility of using the graphite tailings as filling aggregate according to the fillability evaluation standard of Step 3; Step 5: determining the aggregate type, concentration of the mineral material slurry, pumping pressure parameter of the filling device (1), filling radius and displacement of the suction device (2) according to the analysis and research results of Step 2; Step 6: determining the position of the first underground filling well (3) without hydraulic connection on the ground surface within the range of the abandoned coal mine goaf (4), and determining the position of the second filling well (3) by taking the filling radius as the distance from the first filling well (3); Step 7: determining the position of the next filling well (3) by taking the filling radius as the distance from the previous filling well (3) according to the method of Step 6, and drilling a plurality of filling wells (3) in this way; Step 8: when the first filling well (3) is used for filling, the second filling well (3) is used for pumping and pressure relief, the mineral material slurry is filled from the first filling well (3) to the abandoned coal mine goaf (4) by the filling device (1), and the accumulated water is pumped by the second filling well (3) by the suction device (2), so as to form a pressure loop in the filling process, so that the mineral material slurry completes directional filling of the abandoned coal mine goaf (4) in the pressure loop, and the filling degree of the abandoned coal mine goaf (4) is judged by testing whether the graphite mineral material slurry is contained in the pumped accumulated water; Step 9: closing the first filling well (3) after the filling is completed; Step 10: filling the mineral material slurry from each filling well (3) to the coal mine goaf in turn according to the drilling order of the filling well (3) and according to the method of Step 8, the previous filling well (3) is used for filling, and the next filling well (3) is used for pumping and pressure relief, until the overall filling of the abandoned coal mine goaf (4) is completed.

2. A method of disposal of graphite tailings according to claim 1, characterized in that: The filling device (1) comprises a feeder (11), a mixing bin (12), a booster (13) and a filling pipe (14) connected in sequence.

3. A method of disposal of graphite tailings according to claim 2, characterised in that: The feeder (11) is a screw conveyor or a bucket elevator.

4. A method of disposal of graphite tailings as claimed in claim 1, wherein: The booster (13) is a slurry pump.

5. A method of disposal of graphite tailings according to any one of claims 1-4, characterized in that: The suction device (2) is a water pump.

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