A paste filling device suitable for rapid downhole filling and transfer

Abstract

This invention provides a paste filling device suitable for rapid underground filling and transfer, belonging to the field of mine filling technology. The device includes a material addition system, a mixing and pumping system, a concentration monitoring system, and a mobile platform, all integrated on the mobile platform. The material addition system includes a cement addition system, a waste rock addition system, a rod mill sand addition system, and a water addition system; the mixing and pumping system includes a primary mixer, a secondary mixer, and a filling pump. After initial mixing in the primary mixer, the materials enter the secondary mixer for deep mixing, and then flow through pipelines to the filling pump. The paste is pressurized by the filling pump and then transported to the goaf; the concentration monitoring system includes a circulation pipeline, a differential pressure concentration meter, and circulation pipeline control valves. This device has a simple structure and high mobility, and can monitor and adjust the concentration of the output paste according to needs, which helps to improve mine recovery rate and reduce mine production costs.

Description

Technical Field

[0001] This invention relates to the field of mine backfilling technology, and in particular to a paste backfilling device suitable for rapid backfilling and transfer underground. Background Technology

[0002] Mineral resources are indispensable raw materials for human production and development. More than 95% of the world's primary energy, more than 80% of industrial raw materials, and more than 70% of agricultural production materials come from mineral resources. However, the development of mineral resources has also caused many negative impacts, such as large-scale mining subsidence, land collapse, water loss, and the accumulation of large amounts of solid waste.

[0003] Paste backfilling is an effective way to solve the above problems. It has advantages such as high recovery rate, safety, and environmental friendliness, effectively promoting sustainable mine development and green mineral resource development, and has been widely used worldwide. Paste backfill material is first mixed at a surface backfilling station, then pumped and pressurized before being transported to the goaf through a pipeline system. Existing backfilling systems have the following problems: ① Pipeline laying is required before filling each goaf, which is a time-consuming and labor-intensive task; ② Long-distance transportation affects the performance of the backfill slurry, leading to stratification of the backfill body, as well as problems such as pipe blockage, pipe bursts, and blockage of backfill boreholes, seriously affecting production efficiency; ③ When dealing with small, dispersed ore bodies, laying a large number of pipelines and constructing a backfilling system will result in significant resource waste and increased production costs. Therefore, it is necessary to study a paste backfilling device suitable for rapid underground backfilling and transfer. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a paste filling device suitable for rapid downhole filling and transfer.

[0005] The device includes a material addition system, a stirring and pumping system, a concentration monitoring system, and a mobile platform, with the material addition system, stirring and pumping system, and concentration monitoring system integrated on the mobile platform;

[0006] The material addition system includes a cement addition system, a waste rock addition system, a rod mill sand addition system, and a water addition system. The cement addition system includes a cement addition port, a cement addition control valve, and a plate flow meter. The waste rock addition system includes a waste rock addition port, a vibrating screen, a waste rock addition control valve, and a plate flow meter. The rod mill sand addition system includes a rod mill sand addition port, a rod mill sand addition control valve, and a plate flow meter. The water addition system includes an external water pipe and an electromagnetic metering valve.

[0007] The mixing and pumping system includes a primary mixer, a secondary mixer, and a filling pump;

[0008] The concentration monitoring system includes a circulation pipeline, a differential pressure concentration meter, and circulation pipeline control valves;

[0009] A cement addition control valve is installed below the cement addition port, and a punch-plate flow meter is installed below the cement addition control valve. Cement is added to the primary mixer through the cement addition port. An external water pipe is connected to the primary mixer. A vibrating screen is installed at the bottom of the waste rock addition port. An aggregate addition control valve and a punch-plate flow meter are installed sequentially on the conveying pipe below the vibrating screen. Waste rock aggregate is added to the primary mixer through the waste rock addition port. The bottom of the rod mill sand addition port is directly connected to the conveying pipe. A rod mill sand addition control valve and a punch-plate flow meter are installed sequentially on the conveying pipe. Rod mill sand is added to the primary mixer through the rod mill sand addition port.

[0010] A secondary mixer is installed below the primary mixer. After the material is initially mixed in the primary mixer, it enters the secondary mixer for deep mixing. Then it enters the filling pump through the pipeline. After being pressurized by the filling pump, the slurry is transported to the goaf.

[0011] A discharge valve and a pumping valve are installed between the secondary mixer and the filling pump, as well as at the outlet of the filling pump, to control the filling feed.

[0012] The signal control terminals for all valves and flow meters are used to monitor concentration and control material addition.

[0013] The main structure of the mobile platform is a tire-mounted chassis, equipped with a box-type structure to house the necessary equipment for paste filling, reducing dust dispersion during the filling process. Hydraulic supports are installed at the four corners of the box-type structure near the ground to ensure the stability of the filling equipment during paste filling. A driver's cab is located at the front of the mobile platform, with a control terminal installed inside for real-time monitoring of the paste filling material concentration. Feeding is controlled via a flow meter and solenoid valves to meet different filling requirements.

[0014] The cement inlet is an inverted cone shape with a pipe at the bottom for adding materials. After the cement is transported to the cement inlet by a loader, it passes through the cement addition control valve and the flow meter under its own weight and reaches the primary mixer. During the filling operation, the flow meter measures and weighs the cement, provides feedback, and dynamically adjusts the cement addition control valve to achieve quantitative cement feeding.

[0015] The waste rock inlet is a quadrilateral with a sloping base to facilitate the transport of aggregates under their own weight. The vibrating screen is arranged on the diagonal of the waste rock inlet to facilitate the full screening of waste rock. The punch plate flow meter measures and weighs the aggregates, provides feedback, and dynamically adjusts the waste rock inlet control valve to achieve quantitative feeding of waste rock.

[0016] The feeding process for rod mill sand is the same as that for waste rock.

[0017] The water used for filling mainly comes from the water tank and is pumped to the primary mixer. During the filling operation, the water flow rate is measured and fed back by an electromagnetic flow valve, which is then dynamically adjusted to achieve quantitative water feeding.

[0018] The primary mixer is located above the secondary mixer. The primary mixer has a discharge port at its lower left corner, where aggregates, cement, and water are collected and fed into the secondary mixer.

[0019] The main structure of the concentration monitoring system is a circulation pipeline, on which a circulation control valve is installed. The pipeline inlet connects to the outlet pipeline of the filling pump, and the slurry returns to the secondary mixer under the pressure of the filling pump. The differential pressure concentration meter mainly consists of two pressure tapping chambers spaced 0.5m apart and a pressure gauge. Each pressure tapping chamber is equipped with a rubber diaphragm, which separates the clean water from the flowing slurry while simultaneously transferring the static pressure of the slurry at that point to the clean water.

[0020] Differential pressure concentration gauges are mainly installed in the vertical section of the circulation pipeline. When the filling pump starts working, the control valve of the circulation pipeline is opened, and the slurry flows from bottom to top through the two pressure taps of the differential pressure concentration gauge. The pressure difference between the two pressure taps is proportional to the slurry concentration, and the actual slurry concentration can be calculated from this pressure difference. The filling pump, primary mixer, and secondary mixer can all be computer-controlled to adjust the pumping and mixing frequencies to meet different filling requirements.

[0021] The primary mixer adopts a paddle-type structure, with paddles arranged at 90° phase on two parallel rotating shafts in the tank. The blade installation angle is 45°. The material is lifted, mixed, sheared and ground by the rotation and impact of the paddles, and the slurry is pushed forward into the secondary mixer.

[0022] The secondary mixer is a compound continuous mixer with twin-shaft impellers and a 1 / 4 spiral ribbon. The impellers and spiral ribbons on the two parallel rotating shafts are installed at 90° phase. On a single rotating shaft, the impellers and spiral ribbons face each other, while between the two rotating shafts, the impellers and spiral ribbons face opposite directions.

[0023] The primary mixer has a mixing shaft speed of 0-50 r / min and a power of 60 kW; the secondary mixer has the same equipment parameters as the primary mixer.

[0024] The concentration monitoring system calculates the slurry concentration value by extrapolating the pressure difference measured by the differential pressure concentration meter through the control terminal, thereby realizing feedback on the filling concentration.

[0025] The beneficial effects of the above-mentioned technical solution of the present invention are as follows:

[0026] 1. Ensure backfill quality. Thixotropic pastes, when transported over long distances via pipelines, can lead to segregation, causing stratification of the backfill and affecting overall stability. 2. Reduce accident rate. Long-distance transport of pastes requires drilling and laying extensive pipelines, which can result in pipe and borehole blockages. This device effectively reduces pipeline length and minimizes the occurrence of pipeline wear and blockages. 3. Improve recovery rate and reduce production costs. Constructing permanent backfill systems is impractical in the mining of small, dispersed ore bodies. This device effectively reduces the recovery costs of such ore bodies. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of the downhole mobile integrated stirring and charging device of the present invention.

[0028] The components are as follows: 1-Mobile platform; 2-Cement addition port; 3-Cement addition control valve; 4-Plate flow meter I; 5-Waste rock addition port; 6-Vibrating screen; 7-Waste rock addition control valve; 8-Plate flow meter II; 9-Rock mill addition port; 10-Rock mill addition control valve; 11-Plate flow meter III; 12-External water pipe; 13-Solenoid metering valve; 14-Primary mixer; 15-Secondary mixer; 16-Circulation pipeline; 17-Differential pressure concentration meter; 18-Circulation pipeline control valve; 19-Discharge valve; 20-Filling pump; 21-Pumping valve; 22-Control terminal. Detailed Implementation

[0029] To make the technical problems, technical solutions and advantages of the present invention clearer, a detailed description will be given below in conjunction with the accompanying drawings and specific embodiments.

[0030] This invention provides a paste filling device suitable for rapid downhole filling and transfer.

[0031] like Figure 1 As shown, the device includes a material addition system, a stirring and pumping system, a concentration monitoring system, and a mobile platform 1, which are integrated on the mobile platform 1.

[0032] The material addition system includes a cement addition system, a waste rock addition system, a rod mill sand addition system, and a water addition system. The cement addition system includes a cement addition port 2, a cement addition control valve 3, and a punch plate flow meter 4. The waste rock addition system includes a waste rock addition port 5, a vibrating screen 6, a waste rock addition control valve 7, and a punch plate flow meter 8. The rod mill sand addition system includes a rod mill sand addition port 9, a rod mill sand addition control valve 10, and a punch plate flow meter 11. The water addition system includes an external water pipe 12 and an electromagnetic metering valve 13.

[0033] The mixing and pumping system includes a primary mixer 14, a secondary mixer 15, and a filling pump 20;

[0034] The concentration monitoring system includes a circulation pipeline 16, a differential pressure concentration meter 17, and a circulation pipeline control valve 18.

[0035] A cement adding control valve 3 is installed at the bottom of the cement adding port 2, and a punch plate flow meter 4 is installed at the bottom of the cement adding control valve 3. Cement is added to the primary mixer 14 through the cement adding port 2. An external water pipe 12 is connected to the primary mixer 14 via an electromagnetic metering valve 13. A vibrating screen 6 is installed at the bottom of the waste rock adding port 5. An aggregate adding control valve 7 and a punch plate flow meter 8 are installed sequentially on the conveying pipe below the vibrating screen 6. Waste rock aggregate is added to the primary mixer 14 through the waste rock adding port 5. The bottom of the rod mill sand adding port 9 is directly connected to the conveying pipe. A rod mill sand adding control valve 10 and a punch plate flow meter 11 are installed sequentially on the conveying pipe. Rod mill sand is added to the primary mixer 14 through the rod mill sand adding port 9.

[0036] A secondary mixer 15 is installed below the primary mixer 14. After the material is initially mixed in the primary mixer 14, it enters the secondary mixer 15 for deep mixing. Then it enters the filling pump 20 through the pipeline. After the slurry is pressurized by the filling pump 20, it is transported to the goaf.

[0037] A discharge valve 19 and a pumping valve 21 are respectively installed between the secondary mixer 15 and the filling pump 20 and at the outlet of the filling pump 20 to control the filling feed.

[0038] The signal control terminals for all valves and flow meters are used to monitor concentration and control material addition.

[0039] The main structure of the mobile platform 1 is a tire-mounted mobile chassis, equipped with a box-type structure for housing the equipment required for paste filling to reduce dust diffusion during the filling process. Hydraulic supports are installed at the four corners of the box-type structure near the ground to ensure the stability of the filling equipment during paste filling.

[0040] The cement inlet 2 is an inverted cone shape, with a pipe at the bottom for adding materials. The cement is metered and weighed by a plate flow meter 4, which provides feedback and dynamically adjusts the cement adding control valve 3 to achieve quantitative cement feeding.

[0041] The waste rock inlet 5 is a quadrilateral with a sloping bottom to facilitate the transport of aggregates under their own weight. The vibrating screen 6 is arranged on the diagonal of the waste rock inlet 5 to facilitate the full screening of waste rock. The punch plate flow meter 8 measures and weighs the aggregates, provides feedback, and dynamically adjusts the waste rock inlet control valve 7 to achieve quantitative feeding of aggregates.

[0042] The main structure of the concentration monitoring system is a circulation pipeline 16, on which a circulation pipeline control valve 18 is installed. The pipeline inlet is connected to the outlet pipeline of the filling pump 20, and the slurry returns to the secondary mixer 15 under the pressure of the filling pump 20. The differential pressure concentration meter 17 mainly consists of two pressure tapping chambers spaced 0.5m apart and a pressure gauge. The pressure tapping chambers are equipped with rubber diaphragms, which separate the clean water from the flowing slurry and simultaneously transfer the static pressure of the slurry at that point to the clean water.

[0043] The differential pressure concentration meter 17 is mainly installed in the vertical section of the circulation pipeline 16. When the filling pump 20 starts working, the circulation pipeline control valve 18 is opened, and the slurry flows from bottom to top through the two pressure tapping chambers of the differential pressure concentration meter. The pressure difference between the two pressure tapping chambers is proportional to the slurry concentration. The actual slurry concentration can be calculated based on this pressure difference.

[0044] The primary mixer 14 adopts a paddle-type structure, with paddles arranged at 90° phase on two parallel rotating shafts in the tank. The blade installation angle is 45°. The material is lifted, mixed, sheared and ground by the rotation and impact of the paddles, and the slurry is pushed forward into the secondary mixer.

[0045] The secondary mixer 15 is a compound continuous mixer with a dual-shaft impeller and a 1 / 4 spiral ribbon. The impeller and spiral ribbon on the two parallel rotating shafts are installed at 90° phase. On a single rotating shaft, the impeller and spiral ribbon face each other, while between the two rotating shafts, the impeller and spiral ribbon face opposite directions.

[0046] The concentration monitoring system calculates the slurry concentration value by extrapolating the pressure difference measured by the differential pressure concentration meter 17 through the control terminal 22, thereby realizing feedback of the filling concentration.

[0047] The mobile platform 1 is equipped with a driver's cab at the front end. The control terminal 22 is installed in the driver's cab to facilitate real-time observation of the concentration of the paste filling material and to control the feeding regulation by controlling the punch flow meter and solenoid valve to meet different filling requirements.

[0048] The primary mixer 14 has a mixing shaft speed of 0-50 r / min and a power of 60 kW; the secondary mixer 15 has the same equipment parameters as the primary mixer 14.

[0049] The following details the usage of the paste filling device suitable for rapid downhole filling and transfer, including the following steps:

[0050] S1: Material Preparation. The cementing materials and rod mill sand required for paste filling are transported to the underground storage bin via the auxiliary shaft for storage. Excavated waste rock is crushed to a particle size of 6mm at the underground crushing station for use. During filling, a loader is used to transport the aggregate to the filling point.

[0051] S2: Transfer of filling equipment and pipeline laying. Before filling the goaf, the filling equipment needs to be moved to the blind end of the main roadway closest to the goaf. After stopping, the hydraulic props are turned on and power is supplied to the equipment via electrical wires. The filling pump outlet is connected to the goaf using a 130mm thickened PVC pipe and secured accordingly. At the same time, external water pipes are connected and small belt conveyors are installed at each aggregate inlet to facilitate feeding the filling system.

[0052] S3: Filling. Before filling, first open solenoid valve 11 to add water to the mixer, then turn on the filling pump to send water to the goaf through the pipeline, thereby lubricating the pipeline and reducing the resistance of the paste transport. After lubricating the pipeline, calculate the material ratio according to the required filling concentration (as shown in the table below), add and mix the materials to form a paste, and finally turn on the filling pump to fill.

[0053] Table 1. Paste Formulation Parameters (per m³) 3 ).

[0054] Fly ash: coarse aggregate mass concentration % cement kg waste rock kg rod grinding kg fly ash kg water kg 5:5 79 310 324.075 324.075 648.15 427 6:4 79 310 259.25 259.25 777.8 427 6:6 79 310 388.9 388.9 518.5 427

[0055] S4: Post-filling treatment. After the material is filled, water is added to the mixer through an external water pipe. Then, the pipeline is cleaned by pressurizing the filling pump. After power is cut off, the pipeline is disassembled and the filling device is transferred to the next goaf for filling work.

[0056] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A paste filling device suitable for rapid downhole filling and transfer, characterized in that, It includes a material addition system, a mixing and pumping system, a concentration monitoring system, and a mobile platform, with the material addition system, mixing and pumping system, and concentration monitoring system integrated on the mobile platform; The material addition system includes a cement addition system, a waste rock addition system, a rod mill sand addition system, and a water addition system. The cement addition system includes a cement addition port, a cement addition control valve, and a plate flow meter. The waste rock addition system includes a waste rock addition port, a vibrating screen, a waste rock addition control valve, and a plate flow meter. The rod mill sand addition system includes a rod mill sand addition port, a rod mill sand addition control valve, and a plate flow meter. The water addition system includes an external water pipe and an electromagnetic metering valve. The mixing and pumping system includes a primary mixer, a secondary mixer, and a filling pump; The concentration monitoring system includes a circulation pipeline, a differential pressure concentration meter, and circulation pipeline control valves; A cement addition control valve is installed below the cement addition port, and a punch-plate flow meter is installed below the cement addition control valve. Cement is added to the primary mixer through the cement addition port. An external water pipe is connected to the primary mixer. A vibrating screen is installed at the bottom of the waste rock addition port. An aggregate addition control valve and a punch-plate flow meter are installed sequentially on the conveying pipe below the vibrating screen. Waste rock aggregate is added to the primary mixer through the waste rock addition port. The bottom of the rod mill sand addition port is directly connected to the conveying pipe. A rod mill sand addition control valve and a punch-plate flow meter are installed sequentially on the conveying pipe. Rod mill sand is added to the primary mixer through the rod mill sand addition port. A secondary mixer is installed below the primary mixer. After the material is initially mixed in the primary mixer, it enters the secondary mixer for deep mixing. Then it enters the filling pump through the pipeline. After being pressurized by the filling pump, the slurry is transported to the goaf. A discharge valve and a pumping valve are installed between the secondary mixer and the filling pump, as well as at the outlet of the filling pump, to control the filling feed. The signal control terminals for all valves and flow meters are used to monitor concentration and control material addition.

2. The paste filling device for rapid downhole filling and transfer according to claim 1, characterized in that, The main structure of the mobile platform is a tire-type mobile chassis, and it is equipped with a box-type structure to house the equipment required for paste filling in order to reduce the spread of dust during the filling process; hydraulic supports are installed at the four corners of the box-type structure near the ground to ensure the stability of the filling equipment during the paste filling process.

3. The paste filling device for rapid downhole filling and transfer according to claim 1, characterized in that, The cement inlet is an inverted cone shape, with a pipe at the bottom for adding materials. A plate flow meter measures and weighs the cement, provides feedback, and dynamically adjusts the cement adding control valve to achieve quantitative cement feeding.

4. The paste filling device for rapid downhole filling and transfer according to claim 1, characterized in that, The waste rock inlet is a quadrilateral with a sloping bottom to facilitate the conveying of waste rock under its own weight. The vibrating screen is arranged on the diagonal of the waste rock inlet to facilitate the full screening of waste rock. The punch plate flow meter measures and weighs the waste rock, provides feedback, and dynamically adjusts the waste rock addition control valve to achieve quantitative feeding of aggregate.

5. The paste filling device for rapid downhole filling and transfer according to claim 1, characterized in that, The main structure of the concentration monitoring system is a circulation pipeline. A circulation pipeline control valve is installed on the circulation pipeline. The pipeline inlet is connected to the outlet pipeline of the filling pump. The slurry returns to the secondary mixer under the pressure of the filling pump. The differential pressure concentration meter consists of two pressure tapping chambers spaced 0.5m apart and a pressure gauge. The pressure tapping chamber is equipped with a rubber diaphragm, which separates the clean water and the flowing slurry, and at the same time transmits the static pressure of the slurry at that point to the clean water.

6. The paste filling device for rapid downhole filling and transfer according to claim 5, characterized in that, The differential pressure concentration meter is installed in the vertical section of the circulation pipeline. When the filling pump starts working, the control valve of the circulation pipeline is opened, and the slurry flows from bottom to top through the two pressure tapping chambers of the differential pressure concentration meter. The pressure difference between the two pressure tapping chambers is proportional to the slurry concentration, and the actual slurry concentration can be calculated based on this pressure difference.

7. The paste filling device for rapid downhole filling and transfer according to claim 1, characterized in that, The primary mixer has a mixing shaft speed of 0-50 r / min and a power of 60 kW; the secondary mixer has the same equipment parameters as the primary mixer.

8. The paste filling device for rapid downhole filling and transfer according to claim 1, characterized in that, The primary mixer adopts a paddle-type structure, with paddles arranged at 90° phase on two parallel rotating shafts in the tank. The blade installation angle is 45°. The material is lifted, mixed, sheared and ground by the rotation and impact of the paddles, and the slurry is pushed forward into the secondary mixer.

9. The paste filling device for rapid downhole filling and transfer according to claim 1, characterized in that, The secondary mixer is a continuous mixer with a dual-shaft impeller and a 1 / 4 spiral ribbon. The impeller and spiral ribbon on the two parallel rotating shafts are installed at 90° phase. On a single rotating shaft, the impeller and spiral ribbon face each other, while on the two rotating shafts, the impeller and spiral ribbon face opposite directions.

10. The paste filling device for rapid downhole filling and transfer according to claim 6, characterized in that, The concentration monitoring system calculates the slurry concentration value by extrapolating the pressure difference measured by the differential pressure concentration meter through the control terminal, thereby realizing feedback of the filling concentration.

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