A method for coordinated operation of ore body pumping

Abstract

This invention relates to a method for coordinated ore body pumping operations, comprising the following steps: S1, screening of various stationary materials; S2, slurry preparation; S3, slurry filtration; S4, pressurizing and conveying the paste filling slurry to the filling pipe via a slurry filling pump for feeding; S5, arranging filling pipelines at the filling location or extending them to the filling location via ground drilling for filling. This method for coordinated ore body pumping operations effectively integrates and utilizes each step, facilitating strict control of the raw material parameters for paste slurry preparation, resulting in a higher pass rate for the prepared paste slurry compared to the concentration of general paste filling materials, thus improving the filling effect.

Description

Technical Field

[0001] This invention relates to the field of ore body pumping and filling technology, and in particular to a method for coordinated operation of ore body pumping. Background Technology

[0002] Green mining is an inevitable trend in mining development. Employing tailings-free backfilling mining methods can improve mineral recovery rates, reduce land depletion, fully utilize resources, effectively control ground pressure, prevent building and surface subsidence, and allow for underground mining. Paste backfilling technology has also been innovated and developed during the continuous transformation and development of backfilling mining methods. Paste backfilling involves processing coal gangue, low-quality soil, and fly ash from power plants into a paste-like slurry on the surface, then pumping it through pipelines to the underground working face using high-density solid backfilling pumps and gravity to fill the goaf in a timely manner. The key to paste backfilling is to form an overburden support system based on paste slurry in the goaf of the underground working face, effectively controlling surface subsidence within permissible limits for buildings, protecting groundwater from damage, improving coal resource recovery rates, and improving mine safety conditions.

[0003] The main advantages of paste pumping cemented backfilling are: high tailings utilization rate, which can save most of the cost of collecting and processing backfill material; reduced tailings dam infrastructure, operation and maintenance costs; reduced cement consumption, which lowers backfilling costs; improved underground working environment, and savings in drainage and sewage fees. When using it, the slurry must not settle, bleed, or segregate. The most important requirement for this is strict control of the preparation parameters. However, in existing paste backfilling methods, it is not easy to control the raw material preparation parameters, control the quality, and ensure the filling quality.

[0004] To address these issues, we propose a collaborative ore body pumping operation method. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing paste filling methods, such as difficulty in controlling raw material preparation parameters, quality control, and filling quality, and to propose a method for coordinated operation of ore body pumping.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A method for coordinated ore body pumping operations includes the following steps:

[0008] S1. Screening of various fixed materials: Select suitable raw materials in the soil storage yard. The aggregates are mainly crushed gangue and soil. Screening is carried out by screening machinery to select aggregates of different sizes.

[0009] S2. Slurry preparation: Different raw materials are fed into a quantitative feeder using a loader, and then screened by a vibrating screen on the tailings feeder. The prepared materials that have been screened again are added to a mixing tank via a conveyor belt to mix the raw materials of different coarseness. The initially mixed raw materials are then added to a pulping machine, and water is added to the pulping machine using a water pump. The pulping machine is then used to prepare slurry.

[0010] S3. Slurry filtration: The slurry is filtered by a slurry filter. The filtered residue is then transported to a suitable storage location by a loading loader. The purpose of the slurry filter is to facilitate the filtration of impurities in the slurry and prevent the filtered impurities from damaging the slurry filling pump and other filling equipment.

[0011] The filtered slurry undergoes a viscosity-adjusting process. Specifically, cement and fly ash are added to the slurry to adjust its consistency, and the mixture is halved using a high-speed mixer to enhance its gelling activity. This results in a slurry volume concentration greater than 50%, forming a stable, toothpaste-like paste that moves as a whole within the pipe like a plastic structure. This prevents the solid particles in the paste from settling and avoids interlayer exchange, instead exhibiting a "plastic plug" motion. The specific rheological characteristics of the paste slurry can be seen in the following formula:

[0012]

[0013] τ is the shear stress, in Pa; S represents the velocity gradient or shear rate. -1 ;K、τ y , n represent the fluid viscosity, initial shear stress, and flow index, respectively, and K and τ y , n, which are the fluid viscosity, initial shear stress and flow index, are collectively referred to as the rheological parameters of the slurry;

[0014] Viscosity K: When a slurry moves, the faster-moving part of the slurry will accelerate the slower-moving part that comes into contact with it, and conversely, the slower-moving part of the slurry will slow down the faster-moving part that comes into contact with it. This property is called the viscosity of the slurry, and the measure of this viscosity is called viscosity.

[0015] Initial shear stress τ y A suspension containing a certain number of fine particles will form a three-dimensional flocculated structure with a certain rigidity in a static state, generating cohesion, i.e., initial shear stress, which can resist a certain shear force. When the shear force is less than the initial shear stress, the slurry will not flow; when the shear force is greater than the initial shear stress, the slurry begins to undergo plastic flow. The initial shear stress is related to factors such as the concentration of the slurry, temperature, particle size and gradation of solid particles, fine particle content, and particle density.

[0016] Flow index n: The flow index, also known as the flow state coefficient, indicates the degree to which a non-Newtonian body deviates from a Newtonian body. For Newtonian bodies, n equals 1; for dilatant bodies, n is greater than 1; and for pseudoplastic bodies, n is between 0 and 1.

[0017] S4. Feeding slurry: The paste filling slurry is pressurized and delivered to the filling pipe by the slurry filling pump.

[0018] S5. Filling: Arrange filling pipelines at the filling location or extend them to the filling location via ground drilling. The slurry filling pumping process includes the following steps: checking the filling system, slurry pushing water, and filling slurry pushing slurry.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] The ore body pumping collaborative operation method proposed in this application can effectively integrate and utilize each step during use, which facilitates strict control of the raw material parameters for paste slurry preparation, resulting in a higher qualified rate of paste slurry preparation than the concentration of general paste filling materials, and improving the filling effect. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other embodiments can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a general flowchart of a ore body pumping collaborative operation method according to an embodiment of the present invention;

[0023] Figure 2 This is a flowchart illustrating the screening steps of various stationary materials in a ore body pumping collaborative operation method according to an embodiment of the present invention.

[0024] Figure 3 This is a detailed flowchart of slurry preparation for a ore body pumping collaborative operation method according to an embodiment of the present invention.

[0025] Figure 4 This is a detailed flowchart of a slurry filtration method for a ore body pumping collaborative operation according to an embodiment of the present invention.

[0026] Figure 5 This is a flowchart illustrating the slurry filling and pumping process in a ore body pumping collaborative operation method according to an embodiment of the present invention. Detailed Implementation

[0027] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0028] like Figure 1 The diagram shown is a general flow chart of a ore body pumping collaborative operation method according to an embodiment of the present invention. The ore body pumping collaborative operation method of the present invention includes the following steps:

[0029] S1. Screening of various stationary materials.

[0030] Specifically, Figure 2 This is a flowchart illustrating the screening steps of various stationary materials in a ore body pumping collaborative operation method according to an embodiment of the present invention, as shown below. Figure 2 As shown, the specific process for screening various stationary materials includes:

[0031] S1.1 Select suitable raw materials at the soil storage site. The aggregates are mainly crushed gangue and soil.

[0032] S1.2. Use screening machinery to select aggregates of different sizes.

[0033] S2, Slurry preparation.

[0034] Specifically, Figure 3 This is a flowchart illustrating the slurry preparation process in a ore body pumping collaborative operation method according to an embodiment of the present invention. Figure 3 As shown, the specific process for slurry preparation includes:

[0035] S2.1. Use a loader to feed different raw materials to the quantitative feeder;

[0036] S2.2, The tailings are then screened through a vibrating screen installed on the tailings feeder;

[0037] S2.3 The prepared materials that are screened again are added to the mixing tank via a conveyor belt to mix the raw materials of different coarseness. Then the raw materials that have been mixed initially are added to the pulping machine. At the same time, water is added to the pulping machine using a water pump, and the pulping machine is used to prepare slurry.

[0038] S3, Slurry filtration.

[0039] Specifically, Figure 4 This is a detailed flowchart of slurry filtration in a ore body pumping coordinated operation method according to an embodiment of the present invention. Figure 3 As shown, the specific process of slurry filtration includes:

[0040] S3.1 The slurry is filtered using a slurry filter, and the filtered residue is then stockpiled. The purpose of the slurry filter is to facilitate the removal of impurities from the slurry, preventing these impurities from damaging the slurry filling pump and other filling equipment. The filtered residue is then transported to a suitable stockpiling location using a loader.

[0041] S3.2. Thicken the filtered slurry.

[0042] Specifically, cement and fly ash, which can adjust the consistency, are added to the filtered slurry, and then mixed using a high-speed mixer to improve the slurry's gelling activity, resulting in a volume concentration greater than 50%. This causes the slurry to become a stable, toothpaste-like paste, moving as a whole within the pipe like a plastic structure. This prevents the solid particles in the paste from settling and prevents interlayer exchange, instead exhibiting a "plunger-like" motion. See the rheological mechanical characteristic model formula for the paste slurry for details.

[0043]

[0044] Where τ is the shear stress, in Pa; S represents the velocity gradient or shear rate. -1 ;K、τ y , n represent the fluid viscosity, initial shear stress, and flow index, respectively, and K and τ y , n, which are the fluid viscosity, initial shear stress, and flow index, are collectively referred to as the rheological parameters of the slurry.

[0045] (1) Viscosity K: When a slurry moves, the faster-moving part of the slurry will accelerate the slower-moving part that comes into contact with it, and conversely, the slower-moving part of the slurry will slow down the faster-moving part that comes into contact with it. This property is called the viscosity of the slurry, and the measure of this viscosity is called viscosity.

[0046] (2) Initial shear stress τ y A suspension containing a certain number of fine particles will form a three-dimensional flocculated structure with a certain rigidity when at rest, generating cohesion, i.e., initial shear stress, which can resist a certain shearing action. When the shear force is less than the initial shear stress, the slurry will not flow; when the shear force is greater than the initial shear stress, the slurry begins to undergo plastic flow. The initial shear stress is related to factors such as the concentration of the slurry, temperature, particle size and gradation of solid particles, fine particle content, and particle density.

[0047] (3) Flow index n: The flow index, also known as the flow state coefficient, indicates the degree to which a non-Newtonian body deviates from a Newtonian body. For Newtonian bodies, n equals 1; for dilatant bodies, n is greater than 1; for pseudoplastic bodies, n is between 0 and 1.

[0048] (4) The main parameters are as follows:

[0049]

[0050]

[0051] S4, feeding slurry;

[0052] The paste filling slurry is pressurized and delivered to the filling pipe by a slurry filling pump.

[0053] S5. Filling, the filling method is to arrange filling pipes at the filling location, or

[0054] The holes drilled manually on the ground by machines extend to the filling location for coordinated operation;

[0055] S5.1, Slurry filling and pumping.

[0056] Figure 5 This is a flowchart illustrating the slurry filling and pumping process in a ore body pumping collaborative operation method according to an embodiment of the present invention.

[0057] like Figure 5 As shown, the specific procedures include the following:

[0058] S5.1.1 Inspect the filling system to ensure that the filling system equipment is working properly and that the filling pipeline is filled with clean water;

[0059] S5.1.2 Grout pushing water: Grout made of cement and fly ash is used to push out the clean water that fills the filling pipeline. At the same time, the grout can isolate the filling slurry and clean water in the next filling pipeline, so as to lubricate the pipeline and prevent the filling slurry from segregating and blocking the pipeline.

[0060] S5.1.3 Filling slurry and mortar: Prepare filling slurry according to the normal ratio and pump it. When the clean water, cement and fly ash slurry in the pipeline are drained and a high concentration of slurry flows out from the drain outlet of the filling pipeline, normal working face filling operation can begin.

[0061] S5.2 During backfilling, the support system consisting of the support, backfill, and coal wall is used to jointly bear the force applied by the direct roof and the basic roof at the filling position. The load on the support is reduced, the required working resistance is reduced, and the hydraulic support with lower resistance mainly supports the roof, balances the force of the overlying strata, controls the roof subsidence, maintains the roof at a relatively high position, maximizes the filling space, and improves the filling rate. The two main types of hydraulic supports used in the existing technology are dedicated hydraulic supports for backfilling and backfilling isolation supports.

[0062] The purpose of step S5.2 above is to improve the filling rate of backfilling mining and achieve the ideal filling effect. Before backfilling in the working face, it is necessary to strictly control the subsidence of the roof above the filling area, keep the roof at a high position, and require the backfilling support to have high working resistance.

[0063] Thus, the present invention facilitates strict control over the raw material parameters for the preparation of pastes and slurries, resulting in a higher pass rate for the preparation of pastes and slurries than the concentration of general paste filler materials, thereby improving the filling effect.

[0064] The hydraulic support for filling is a conventional four-column support with a fixed telescopic column at the base. This column is a non-hydraulic control structure and mainly serves to fix the top beam of the support. The filling isolation support adopts a segmented structure, consisting of a front telescopic beam, a top beam, and a rear telescopic beam. The front telescopic beam provides support for the coal mining area of ​​the working face, the top beam is the main body of the hydraulic support, and the rear telescopic beam provides support for the filling area of ​​the working face. All parts are connected by jacks. The front telescopic beam is equipped with side guards, and the rear telescopic beam is connected to a telescopic isolation device controlled by a hydraulic device. The telescopic isolation device can adapt to the terrain of the filling area, fully contact the ground, and thus form a closed filling space, which isolates the filling area from the production area and protects the filling material.

[0065] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.

Claims

1. A method of ore body pumping co-operation, c h a r a c t e r i s e d in that, The method comprises the following steps: S1, screening of a plurality of fixed body materials, specifically selecting suitable raw materials in a stock yard, and then screening through screening machinery to select aggregates of different coarseness; specifically comprising: S1.1, selecting suitable raw materials in a stock yard, the aggregate is mainly broken gangue and soil; S1.2, screening through screening machinery to select aggregates of different coarseness; S2, slurry preparation, different raw materials are fed to a quantitative feeder by a loading shovel, and then screened again through a vibrating screen arranged on the tailings feeder, and the prepared materials screened are added to a stirring mixing barrel through a conveying belt, so that the raw materials of different coarseness are mixed and stirred; specifically comprising: S2.1, different raw materials are fed to a quantitative feeder by a loading shovel; S2.2, screening again through a vibrating screen arranged on the tailings feeder; S2.3, the prepared materials screened again are added to a stirring mixing barrel through a conveying belt, so that the raw materials of different coarseness are mixed and stirred, and then the primary stirred raw materials are added to a pulper, water is added to the pulper by a water pump, and slurry is prepared by the pulper; S3, slurry filtration, the slurry is filtered through a filter; S3.1, the slurry is filtered through a filter, and the residue after filtration is stacked; the filter is used to facilitate the filtration of impurities in the slurry, prevent the filtered impurities from damaging the filling equipment such as the slurry filling pump, and transport the residue after filtration to a suitable stacking position by a loading shovel; S3.2, viscous treatment of the filtered slurry; specifically, cement and fly ash with adjustable consistency are added to the filtered slurry, and a high-speed stirrer is used for stirring and mixing to improve the cementing activity of the slurry, so that the volume concentration of the slurry is greater than 50%, the slurry becomes a stable toothpaste-like paste, and the paste moves as a whole in the pipeline like a plastic structure, so that the solid particles in the paste do not settle, there is no exchange between layers, and the paste presents a "plunger-like" movement state, which can be seen from the paste slurry rheological mechanics characteristic model formula: ； wherein Pa is the shear stress; is the flow velocity gradient or shear rate, K, n represent the viscosity, the initial shear stress and the flow index of the fluid, respectively, K, n, that is, the viscosity, the initial shear stress and the flow index of the fluid, are collectively referred to as the rheological parameters of the slurry; S4, when feeding the slurry, the paste filling slurry is pressurized and conveyed to the filling pipe by a slurry filling pump; S5, during filling, an upper filling pipeline is arranged at the filling position or is extended and connected to the filling position through a surface borehole, and specifically, the slurry filling pumping comprises the following procedures: S5.1: check the filling system to ensure that the filling system equipment is working properly and that the filling pipeline is filled with clean water; S5.2: mortar pushes water, the mortar made of cement and fly ash pushes out the clean water filled in the filling pipeline, and at the same time, the mortar can isolate the filling slurry in the filling pipeline in the next process from the clean water, so as to achieve the effects of lubricating the pipeline and preventing the filling slurry from segregating and blocking the pipeline; S5.3: filling slurry pushes mortar, the mortar made of cement and fly ash pushes out the clean water filled in the filling pipeline, and at the same time, the mortar can isolate the filling slurry in the filling pipeline in the next process from the clean water, so as to achieve the effects of lubricating the pipeline and preventing the filling slurry from segregating and blocking the pipeline.

2. A method of pumping in conjunction with a mineral body according to claim 1, characterized in that, According to S1, the raw materials are mainly broken gangue and soil.

3. A method of pumping ore bodies in cooperation according to claim 1, characterized by, According to S2, the initial stirred raw materials are added to the pulper, and water is added to the pulper by using a water pump, and a slurry is prepared by the pulper.

4. A method of pumping ore bodies in cooperation according to claim 1, characterized by, According to S3, the filtered residue is transported to a suitable stacking treatment position by using a loading shovel.

5. A method of pumping ore bodies in cooperation according to claim 1, characterized by, According to S5, the filling system is checked to ensure that the filling system equipment is in good working condition, and the filling pipeline is filled with clean water.

6. A method of pumping ore bodies in cooperation according to claim 1, characterized by, According to S5, the mortar pushes the water, and the mortar made of cement and fly ash pushes the clean water filled in the filling pipeline, and the mortar can isolate the filling slurry in the filling pipeline in the next process, so as to achieve the effects of lubricating the pipeline and preventing the segregation of the filling slurry and the blockage of the pipeline.

7. A method of pumping ore bodies in cooperation according to claim 1, characterized by, According to S5, the filling slurry pushes the mortar, and the filling slurry prepared according to the normal ratio is pumped, and when the clean water, the cement and fly ash mortar in the pipeline is emptied, and the filling pipeline drain has a higher concentration of slurry, the normal working face filling operation can be started.

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