Filling slurry preparation system and preparation process combining continuous feeding and static metering

Abstract

The present invention provides a filling slurry preparation system and a preparation process that combine continuous feeding and static metering. The preparation system includes a feeding and metering system and a stirring system connected to the discharge port end of the feeding and metering system; the feeding and metering system includes a tailings mortar feeding and metering system, a binder feeding and metering system, a water feeding and metering system, and a crushed stone feeding and metering system; the tailings mortar feeding and metering system includes a tailings mortar continuous feeding system, a buffer and intermittent feeding system, and a tailings mortar metering hopper connected in sequence; the tailings mortar continuous feeding system continuously feeds the tailings mortar into the buffer and intermittent feeding system, and through the quantitative feeding of the buffer and intermittent feeding system, the tailings mortar is fed into the tailings mortar metering hopper to achieve the accurate metering of the tailings mortar. The present invention realizes the accurate metering of the tailings mortar under the dual control of the buffer and intermittent feeding system and the tailings mortar metering hopper; at the same time, the electric gate valve has small wear and long service life.

Description

Technical Field

[0001] The present invention relates to the technical field of mine filling, and particularly relates to a filling slurry preparation system and a preparation process combining continuous feeding and static metering. Background Art

[0002] With the increasing attention of the country to mining safety, more and more mines adopt the filling mining method for mining. The filling mining method means that as the mining face advances, tailings, cementitious materials, crushed stones and water are mixed to prepare filling slurry, and the filling slurry is filled into the goaf for ground pressure management, controlling the caving of surrounding rocks and surface movement, and at the same time, mining is carried out on or under the protection of the formed filling body.

[0003] The preparation of filling slurry is mainly divided into two preparation processes: continuous preparation and static metering preparation. In the continuous preparation process, the whole system is always in a dynamic process, that is, the thickener continuously discharges tailing slurry dynamically, the cementitious material is fed dynamically, and the production water is added dynamically. Each material enters the mixing tank in the form of dynamic balance and is prepared into filling slurry, and is filled into the underground by self-flow or pumping. The continuous preparation process is mainly used to prepare filling slurry from wet tailings. At the same time, the tailing slurry and the filling slurry enter and exit while working, and the working efficiency is high. However, the proportioning accuracy of each material in the dynamic balance process is relatively low, which will affect the quality of the filling slurry and the filling operation. The static metering preparation process is mainly to weigh each material through static metering, strictly control the proportioning, and then prepare each material into filling slurry by means of intermittent preparation, and fill it into the underground by self-flow or pumping. The static metering preparation process is mainly used to prepare filling slurry from filter-pressed tailings. In this process, it is necessary to filter the tailing slurry to obtain filter-pressed tailings, which is not only cumbersome to operate, but also the current cost of filtering the tailing slurry with filter equipment is much higher than the cost of thickening the tailings into high-concentration slurry with thickening equipment.

[0004] In order to obtain filling slurry with accurate proportioning, save production costs and improve work efficiency, the staff realized that the continuous preparation process and the static metering preparation process can be combined, directly using the tailing slurry for the static metering process, accurately measuring the tailing slurry, and preparing the filling slurry by means of static metering intermittent preparation.

[0005] At present, the common way to combine the two processes is to directly put the tailings slurry in the thickener into the metering system for weighing. The preparation process is as follows: Open the valve controlling the thickener to make it flow into the corresponding metering hopper. When the metering hopper reaches the preset value, the electric sluice valve of the thickener is controlled by the computer system to close. Through this way of opening and closing, the intermittent feeding of the tailings slurry is realized. Then, the tailings slurry in the hopper is stirred with other aggregates to prepare the filling slurry. The following problems will occur in this process: (1) Although the accuracy of this process has been improved, during the closing process of the electric sluice valve, it cannot be closed instantaneously, and often too much tailings slurry will enter the metering hopper, thus affecting the accurate metering of the tailings slurry; (2) This process requires frequent opening and closing of the valve of the electric sluice valve, usually once every 2 - 3 minutes. This way of frequently opening and closing the valve will keep the electric sluice valve in a very large wear state (the tailings slurry is in a state of high flow rate and high pressure), thus shortening the service life of the electric sluice valve and making it need to be replaced frequently (long for about one month, short for about one week). This not only requires high maintenance costs but also affects the production tasks underground.

[0006] In view of this, it is necessary to design an improved filling slurry preparation system and preparation process that combines continuous feeding and static metering to solve the above problems. Summary of the Invention

[0007] The purpose of the present invention is to provide a filling slurry preparation system and preparation process that combines continuous feeding and static metering. By setting up a buffer and intermittent feeding system, the tailings slurry continuous feeding system continuously feeds the tailings slurry into the buffer and intermittent feeding system. At the same time, the buffer and intermittent feeding system quantitatively feeds the tailings slurry into the tailings slurry metering hopper. Through the quantitative control of the buffer and intermittent feeding system and the metering of the tailings slurry metering hopper, under the dual control of the buffer and intermittent feeding system and the tailings slurry metering hopper, the accurate metering of the tailings slurry is realized; the direct impact of the high pressure and large flow rate of the thickener on the electric sluice valve is converted into impacts in multiple regions, small volumes, low pressures, and small flow rates, reducing the wear of the electric sluice valve and increasing the service life of the equipment.

[0008] To achieve the above invention purpose, the present invention provides a filling slurry preparation system that combines continuous feeding and static metering, including a feeding and metering system and a stirring system connected to the outlet end of the feeding and metering system; the feeding and metering system includes a tailings slurry feeding and metering system, a binder feeding and metering system, a water feeding and metering system, and a crushed stone feeding and metering system; the tailings slurry feeding and metering system includes a tailings slurry continuous feeding system, a buffer and intermittent feeding system, and a tailings slurry metering hopper connected in sequence; the tailings slurry continuous feeding system continuously feeds the tailings slurry into the buffer and intermittent feeding system, and through the quantitative feeding of the buffer and intermittent feeding system, the tailings slurry is fed into the tailings slurry metering hopper to realize the accurate metering of the tailings slurry.

[0009] As a further improvement of the present invention, the filling slurry preparation system combining continuous feeding and static metering further includes a first automatic control system, which controls the tailings mortar feeding and metering system, the binder feeding and metering system, the water feeding and metering system, and the gravel feeding and metering system to feed materials to the mixing system, and controls and adjusts the set operating parameters of each feeding and metering system; the buffer and intermittent feeding system includes a main feeding system and a supplementary feeding system; the main feeding system puts a fixed amount of tailings mortar into the tailings mortar metering hopper, and the first automatic control system controls the tailings mortar metering hopper to measure the mass of the tailings mortar entering the tailings mortar metering hopper. At the same time, by comparing the deviation between the tailings mortar in the tailings mortar metering hopper and the system preset value, the feeding amount of the supplementary feeding system controlled by the first automatic control system is adjusted.

[0010] As a further improvement of the present invention, the main feeding system includes a buffer mixing barrel, a dischargeable metering barrel, and a second automatic control system; the feed port end of the buffer mixing barrel is connected to the discharge port end of the tailings mortar continuous feeding system, and the discharge port end is connected to the dischargeable metering barrel; the discharge port end of the dischargeable metering barrel is connected to the feed port end of the tailings mortar metering hopper; the second automatic control system controls the buffer mixing barrel to quantitatively feed materials into the dischargeable metering barrel, and at the same time controls the dischargeable metering barrel to quantitatively feed materials into the tailings mortar metering hopper.

[0011] As a further improvement of the present invention, a first sensor and a second sensor are sequentially arranged on the barrel wall of the buffer mixing barrel from top to bottom; a third sensor is arranged on the barrel wall of the dischargeable metering barrel; the second sensor and the third sensor are on the same horizontal plane; a second electric gate valve and a first concentration meter are arranged on the connecting pipe between the buffer mixing barrel and the dischargeable metering barrel; the tailings mortar continuous feeding system continuously feeds materials into the buffer mixing barrel. When the liquid level of the tailings mortar in the buffer mixing barrel reaches the plane where the first sensor is located, the second automatic control system controls the discharge port of the dischargeable metering barrel to close, and at the same time controls the second electric gate valve to open, and the tailings mortar in the buffer mixing barrel flows into the dischargeable metering barrel. When the liquid level of the tailings mortar in the buffer mixing barrel reaches the plane where the second sensor is located, and the liquid level of the tailings mortar in the dischargeable metering barrel reaches the plane where the third sensor is located, the second automatic control system controls the second electric gate valve to close, and at the same time controls the discharge port of the dischargeable metering barrel to open, and quantitatively feeds materials into the tailings mortar metering hopper.

[0012] As a further improvement of the present invention, the replenishment and feeding system includes a buffer secondary barrel; the feeding port end of the buffer secondary barrel is connected to the discharging port end of the buffer stirring barrel, and the discharging port end is connected to the feeding port end of the tail mortar metering hopper; a third electric gate valve is provided on the connecting pipe between the buffer secondary barrel and the tail mortar metering hopper; when the tail mortar in the tail mortar metering hopper is lower than the system preset value, the first automatic control system controls the third electric gate valve to open and feed materials into the tail mortar metering hopper until the tail mortar in the tail mortar metering hopper reaches the system preset value.

[0013] As a further improvement of the present invention, a second flowmeter and a second concentration meter are also provided on the connecting pipe between the buffer secondary barrel and the tail mortar metering hopper. Through the joint control of the second flowmeter, the second concentration meter and the tail mortar metering hopper, the tail mortar in the tail mortar metering hopper reaches the system preset value, realizing the accurate metering of the tail mortar.

[0014] As a further improvement of the present invention, the continuous tail mortar feeding system includes a thickener; the discharging port of the thickener is connected to the feeding port of the buffer stirring barrel, and the thickener continuously feeds materials into the buffer stirring barrel; a first electric gate valve and a first flowmeter for measuring the flow rate of the tail mortar are provided on the connecting pipe between the thickener and the buffer stirring barrel.

[0015] As a further improvement of the present invention, the binder feeding and metering system includes a binder metering hopper; the water feeding and metering system includes a water metering hopper; the crushed stone feeding and metering system includes a crushed stone metering hopper.

[0016] To achieve the above-mentioned invention purpose, the present invention also provides a preparation process of filling slurry combining continuous feeding and static metering, which is carried out by using the continuous feeding and static metering combined filling slurry preparation system described above, and includes the following steps:

[0017] S1. Filling material feeding:

[0018] S11. Feed materials into the tail mortar metering hopper through the tail mortar feeding and metering system, and measure the tail mortar through the tail mortar metering hopper until the tail mortar in the tail mortar metering hopper reaches the system preset value;

[0019] S12. Feed materials into the binder metering hopper through the binder feeding and metering system, and measure the binder through the binder metering hopper until the binder in the binder metering hopper reaches the system preset value;

[0020] S13. Feed materials into the crushed stone metering hopper through the crushed stone feeding and metering system, and measure the crushed stone through the crushed stone metering hopper until the crushed stone in the crushed stone metering hopper reaches the system preset value;

[0021] S14. Feed water into the water measuring hopper through the water feeding and metering system, and measure the crushed stones through the water measuring hopper until the water in the water measuring hopper reaches the preset value of the system;

[0022] S2. Mix the filling materials:

[0023] The first automatic control system controls the tailings mortar measuring hopper, the binder measuring hopper, the water measuring hopper and the crushed stone measuring hopper to discharge materials into the mixing system; the mixing system mixes various filling materials evenly to prepare the filling slurry.

[0024] As a further improvement of the present invention, the step S11 is specifically: the continuous tailings mortar discharging system continuously discharges tailings mortar into the main discharging system, and then the main discharging system discharges a fixed amount of tailings mortar into the tailings mortar measuring hopper. When the tailings mortar in the tailings mortar measuring hopper is within the deviation range of the preset value of the system, the first automatic control system controls the tailings mortar measuring hopper to discharge the tailings mortar into the mixing system; when the tailings mortar in the tailings mortar measuring hopper is lower than the deviation range of the preset value of the system, the first automatic control system controls the supplementary discharging system to discharge materials into the tailings mortar measuring hopper until the tailings mortar in the tailings mortar measuring hopper reaches the preset range of the system, and then the first automatic control system controls the tailings mortar measuring hopper to discharge the tailings mortar into the mixing system. At the same time, the first automatic control system correspondingly adjusts the discharging amount of the water measuring hopper; when the tailings mortar in the tailings mortar measuring hopper is higher than the deviation range of the preset value of the system, the first automatic control system correspondingly adjusts the discharging amounts of the other filling materials to prepare the filling slurry.

[0025] The beneficial effects of the present invention are:

[0026] (1) By setting up the buffer and intermittent discharging system, the continuous tailings mortar discharging system continuously discharges tailings mortar into the buffer and intermittent discharging system. During this process, the continuous tailings mortar discharging system is always in a working state, and there is no need to switch the corresponding electric gate valve, reducing the continuous wear of the electric gate valve by the tailings mortar under high flow rate and high pressure, and prolonging the service life of the electric gate valve.

[0027] The tail mortar is stored in the buffer and intermittent feeding system. The buffer and intermittent feeding system can feed the tail mortar metering hopper quantitatively. Through the quantitative control of the buffer and intermittent feeding system and the metering of the tail mortar metering hopper, under the dual control of the buffer and intermittent feeding system and the tail mortar metering hopper, the accurate metering of the tail mortar is achieved. In addition, by using the buffer and intermittent feeding system, the direct impact of the electric slide gate valve by the high pressure and large flow of the thickener is converted into impacts in multiple regions, small volumes, low pressures, and small flows, minimizing the resistance of the electric slide gate valve as much as possible, thereby reducing the wear of the electric slide gate valve, ensuring the stable and reliable operation of each device, and increasing the service life of the device.

[0028] (2) Through the synergistic effect of the main feeding system and the supplementary feeding system, the present invention feeds the tail mortar metering hopper more accurately. When using the main feeding system to feed, under the dual control of the quantitative control of the main feeding system and the metering of the tail mortar metering hopper, the accurate metering of the tail mortar is achieved; when using the supplementary feeding system to feed, through the real-time monitoring of the tail mortar concentration by the concentration meter and the quantitative control of the flow meter, under the joint control of the flow meter, the concentration meter and the tail mortar metering hopper, the accurate metering of the tail mortar is achieved.

[0029] In this process, not only the content of the tail mortar is compared, but also the content of the tailings and water in the tail mortar is compared. Through the comparison of multiple parameters, the accurate metering of the tail mortar is further controlled. At the same time, by setting two concentration meters, the concentration of the tail mortar in each container is detected more carefully, and the accuracy of the accurate metering of the tail mortar is higher. Description of the Drawings

[0030] Figure 1 It is a schematic structural diagram of the filling slurry preparation system combining continuous feeding and static metering of the present invention.

[0031] Figure 2 is Figure 1 a schematic structural diagram of the tail mortar feeding and metering system in

[0032] Reference Signs

[0033] 1 - Stirring system; 2 - Tail mortar feeding and metering system; 3 - Binder feeding and metering system; 4 - Water feeding and metering system; 5 - Crushed stone feeding and metering system; 21 - Tail mortar continuous discharging system; 22 - Tail mortar metering hopper; 23 - Main discharging system; 24 - Supplementary discharging system; 31 - Binder metering hopper; 32 - Screw feeder; 41 - Water metering hopper; 42 - Water pump; 51 - Crushed stone metering hopper; 52 - Belt feeder; 211 - Thickener; 212 - First electric gate valve; 213 - First flowmeter; 214 - First manual gate valve; 231 - Buffer mixing tank; 232 - Dischargeable metering tank; 233 - First sensor; 234 - Second sensor; 235 - Third sensor; 236 - Second electric gate valve; 237 - First concentration meter; 238 - Second manual gate valve; 241 - Buffer secondary tank; 242 - Third electric gate valve; 243 - Second flowmeter; 244 - Second concentration meter; 245 - Third manual gate valve. Detailed implementation manners

[0034] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] Here, it should also be noted that in order to avoid obscuring the present invention due to unnecessary details, only the structures and / or processing steps closely related to the solution of the present invention are shown in the drawings, while other details less related to the present invention are omitted.

[0036] In addition, it should also be noted that the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device.

[0037] Please refer to Figure 1 and Figure 2As shown in the figure, the present invention provides a filling slurry preparation system combining continuous feeding and static metering, which includes a feeding and metering system and a stirring system 1 connected to the discharge port end of the feeding and metering system. The feeding and metering system includes a tailing slurry feeding and metering system 2, a binder feeding and metering system 3, a water feeding and metering system 4, and a crushed stone feeding and metering system 5. The tailing slurry feeding and metering system 2 includes a tailing slurry continuous feeding system 21, a buffer and intermittent feeding system, and a tailing slurry metering hopper 22 connected in sequence. With such a setting, first, the tailing slurry continuous feeding system 21 continuously feeds the tailing slurry into the buffer and intermittent feeding system. During this process, the tailing slurry continuous feeding system 21 is always in a working state, and there is no need to switch the corresponding electric gate valve, reducing the continuous wear of the electric gate valve by the tailing slurry under high flow rate and high pressure, and extending the service life of the electric gate valve. Second, the tailing slurry is stored in the buffer and intermittent feeding system, and the buffer and intermittent feeding system can quantitatively feed the tailing slurry into the tailing slurry metering hopper 22. Through the quantitative control of the buffer and intermittent feeding system and the metering of the tailing slurry metering hopper 22, precise metering of the tailing slurry is achieved under the dual control of the buffer and intermittent feeding system and the tailing slurry metering hopper 22.

[0038] The filling slurry preparation system combining continuous feeding and static metering further includes a first automatic control system, which controls the tailing slurry feeding and metering system 2, the binder feeding and metering system 3, the water feeding and metering system 4, and the crushed stone feeding and metering system 5 to quantitatively feed materials into the stirring system 1, and at the same time controls and adjusts the set operating parameters of each feeding and metering system, and real-time controls and adjusts the feeding amounts of each filling material.

[0039] As Figure 1 shown in the figure, the binder feeding and metering system 3 includes a binder metering hopper 31 and a screw feeder 32 for feeding (binder) into the binder metering hopper 31. The water feeding and metering system 4 includes a water metering hopper 41 and a water pump 42 for feeding (water) into the water metering hopper 41. The crushed stone feeding and metering system 5 includes a crushed stone metering hopper 51 and a belt feeder 52 for feeding (crushed stone) into the crushed stone metering hopper 51.

[0040] As Figure 2 shown in the figure, the tailing slurry continuous feeding system 21 includes a thickener 211, the discharge port of the thickener 211 is connected to the buffer and intermittent feeding system, and the thickener 211 continuously feeds the tailing slurry into the buffer and intermittent feeding system. A first electric gate valve 212 and a first flowmeter 213 are provided on the connecting pipe between the thickener 211 and the buffer and intermittent feeding system, and the first flowmeter 213 can measure the volume of the tailing slurry flowing into the buffer and intermittent feeding system per unit time.

[0041] The buffer and intermittent feeding system includes a main feeding system 23 and a supplementary feeding system 24; both the main feeding system 23 and the supplementary feeding system 24 can achieve quantitative feeding into the tail mortar metering hopper 22. After the main feeding system 23 puts a certain amount of tail mortar into the tail mortar metering hopper 22, the first automatic control system controls the tail mortar metering hopper 22 to measure the mass of the tail mortar entering it. At the same time, the first automatic control system adjusts the feeding amount of the supplementary feeding system 24 by comparing the deviation between the mass of the tail mortar measured by the tail mortar metering hopper 22 and the preset value of the system, so as to achieve accurate measurement of the tail mortar.

[0042] The main discharging system 23 includes a buffer stirring tank 231, a dischargeable metering tank 232 and a second automatic control system. Two discharge ports are arranged on the barrel wall of the buffer stirring tank 231 from top to bottom. The feed port end of the buffer stirring tank 231 is connected to the tail mortar continuous discharging system 21. The upper discharge port is connected to the dischargeable metering tank 232, and the lower discharge port is connected to the supplementary discharging system 24. The discharge port end of the dischargeable metering tank 232 is connected to the feed port end of the tail mortar metering hopper 22. The second automatic control system controls the buffer stirring tank 231 to discharge materials into the dischargeable metering tank 232 quantitatively, and at the same time controls the dischargeable metering tank 232 to discharge materials into the tail mortar metering hopper 22 quantitatively. Specifically, a first sensor 233 and a second sensor 234 are arranged on the barrel wall of the buffer stirring tank 231 from top to bottom in sequence. A third sensor 235 is arranged on the upper barrel wall of the dischargeable metering tank 232. The second sensor 234 and the third sensor 235 are on the same horizontal plane. A second electric gate valve 236 and a first concentration meter 237 (used to measure the mass concentration of the tail mortar flowing into the dischargeable metering tank 232, and this concentration can be regarded as the mass concentration of the tail mortar flowing from the main discharging system 23 into the tail mortar metering hopper 22, that is, the mass percentage of the tail sand in the tail mortar) are arranged on the connecting pipe between the buffer stirring tank 231 and the dischargeable metering tank 232. The tail mortar continuous discharging system 21 continuously discharges materials into the buffer stirring tank 231. When the liquid level of the tail mortar in the buffer stirring tank 231 reaches the plane where the first sensor 233 is located, the second automatic control system controls the discharge port of the dischargeable metering tank 232 to close, and at the same time controls the second electric gate valve 236 to open. The tail mortar in the buffer stirring tank 231 flows into the dischargeable metering tank 232. When the liquid level of the tail mortar in the buffer stirring tank 231 reaches the plane where the second sensor 234 is located, according to the principle of communicating vessels, at this time, the liquid level of the tail mortar in the dischargeable metering tank 232 reaches the plane where the third sensor 235 is located (because the second sensor 234 and the third sensor 235 are on the same horizontal plane, and the volume between the plane where the first sensor 233 is located and the plane where the second sensor 234 is located in the buffer stirring tank 231 is slightly smaller than the volume from the plane where the third sensor 235 is located to the bottom of the dischargeable metering tank 232). The second automatic control system controls the second electric gate valve 236 to close, and at the same time controls the discharge port of the dischargeable metering tank 232 to open, and discharges materials into the tail mortar metering hopper 22 quantitatively.

[0043] The supply and discharging system 24 includes a buffer secondary barrel 241; the feeding port end of the buffer secondary barrel 241 is connected to the discharging port end of the buffer stirring barrel 231 (a stirring system for stirring the tail mortar is provided in both the buffer stirring barrel 231 and the buffer secondary barrel 241 to prevent the tail mortar from stratifying), and the discharging port end of the buffer secondary barrel 241 is connected to the feeding port end of the tail mortar metering hopper 22 (the connecting pipes between the buffer stirring barrel 231, the dischargeable metering barrel 232, the buffer secondary barrel 241 and the tail mortar metering hopper 22 are all steel pipes, preferably 16Mn steel pipes). As Figure 2 shown, the volume of the buffer secondary barrel 241 is smaller than that of the buffer stirring barrel 231, and the highest plane of the buffer secondary barrel 241 is lower than the plane where the second sensor 234 is located in the buffer stirring barrel 231. According to the principle of communicating vessels, the buffer secondary barrel 241 is usually filled with tail mortar, so as not to affect the quantitative discharging of the buffer stirring barrel 231 to the dischargeable metering barrel 232. A third electric gate valve 242, a second flowmeter 243 and a second concentration meter 244 are provided on the connecting pipe between the buffer secondary barrel 241 and the tail mortar metering hopper 22 (used to measure the mass concentration of the tail mortar flowing from the buffer secondary barrel 241 into the tail mortar metering hopper 22, that is, the mass percentage content of the tail sand in the tail mortar). The first automatic control system controls and compares the deviation between the mass of the tail mortar metered by the tail mortar metering hopper 22 (the tail mortar put in by the main discharging system 23) and the system preset value, and then adjusts the discharging amount of the supply and discharging system 24 to achieve accurate metering of the tail mortar.

[0044] As shown in Table 1, the following parameters can be displayed in the first automatic control system,

[0045] Table 1 Parameters Displayed in the First Automatic Control System

[0046]

[0047] Among them: the tail mortar is composed of tail sand and water; the system preset value m w of the tail sand in the tail mortar refers to the mass of the tail sand preset in the system; the system preset value m s of the water in the tail mortar refers to the mass of the water preset in the system; the tail mortar in the tail mortar metering hopper 22 only refers to the tail mortar put in by the main discharging system 23; the measured value m c of the tail mortar in the tail mortar metering hopper 22 is directly measured by the tail mortar metering hopper 22; the actual value m 1 of the tail sand and the actual value m 2 of the water in the tail mortar in the tail mortar metering hopper 22 are calculated according to the first concentration meter 237.

[0048] The adjustment of the first automatic control system to the main discharging system 23 and the supply and discharging system 24 is specifically as follows:

[0049] (1) When the deviation between the measured value m c and the system preset value m z is within the range allowed by the system, the replenishment feeding system 24 does not operate.

[0050] (2) When the deviation between the measured value m c and the system preset value m z is not within the range allowed by the system, at this time, the actual value m 1 is compared with the system preset value m w . When the deviation between the actual value m 1 and the system preset value m w is within the range allowed by the system, the replenishment feeding system 24 also does not operate.

[0051] (3) When the deviation between the measured value m c and the system preset value m z is not within the range allowed by the system, and the deviation between the actual value m1 and the system preset value m w is also not within the range allowed by the system, at this time, there are two cases:

[0052] a) The actual value m 1 is lower than the system preset value m w . At this time, the first automatic control system controls the replenishment feeding system 24 to feed materials into the tail mortar metering hopper 22 until the actual value m 1 and the system preset value m w are within the range allowed by the system, and at the same time, the water feeding amount is regulated (achieved by controlling the water metering hopper 41).

[0053] b) The actual value m1 is higher than the system preset value mw. At this time, the first automatic control system will automatically adjust the feeding amounts of the remaining materials.

[0054] In this process, through the volume flow of the second flowmeter 243 and the metering of the tail mortar metering hopper 22, dual control is carried out to make the tail mortar in the tail mortar metering hopper 22 reach the system preset range, realizing the accurate metering of the tail mortar.

[0055] In some embodiments, the second concentration meter 244 may not be provided. Since the tail mortar in the buffer mixing barrel 231 and the buffer secondary barrel 241 is always in a stirred state, it can be approximately considered that the mass concentration of the tail mortar flowing from the buffer secondary barrel 241 into the tail mortar metering hopper 22 is the same as the mass concentration of the tail mortar flowing from the main feeding system 23 into the tail mortar metering hopper 22.

[0056] In some embodiments, a first manual gate valve 214 is provided upstream of the first electric gate valve 212, a second manual gate valve 238 is provided upstream of the second electric gate valve 236, and a third manual gate valve 245 is provided upstream of the third electric gate valve 242. With such an arrangement, the presence of the manual gate valve can cooperate with the electric gate valve. Under normal circumstances, the work is controlled by the electric gate valve, and the manual gate valve is in the open state for a long time. When the electric gate valve fails, the manual gate valve is closed to facilitate the repair and replacement of the electric gate valve.

[0057] The connection relationships of the components controlled by the first automatic control system and the second automatic control system are as follows: each component is respectively connected to the control box through a connecting wire, and then connected to the automatic control system through the control box to achieve automatic control. The automatic control system is set up to facilitate operation. In the case where there is no automatic control system, the accurate measurement of the tail mortar can be achieved through the control of the corresponding components by the staff.

[0058] The present invention also provides a preparation process of filling slurry combining continuous feeding and static metering, which is carried out by using the continuous feeding and static metering combined filling slurry preparation system described above, and includes the following steps:

[0059] S1. Filling material feeding:

[0060] S11. Feed materials into the tail mortar metering hopper 22 through the tail mortar feeding and metering system 2, and meter the tail mortar through the tail mortar metering hopper 22 until the tail mortar in the tail mortar metering hopper 22 reaches the system preset range.

[0061] S12. Feed materials into the binder metering hopper 31 through the screw feeder 32, and meter the binder through the binder metering hopper 31 until the binder in the binder metering hopper 31 reaches the system preset range.

[0062] S13. Feed materials into the crushed stone metering hopper 51 through the belt feeder 52, and meter the crushed stone through the crushed stone metering hopper 51 until the crushed stone in the crushed stone metering hopper 51 reaches the system preset range.

[0063] S14. Feed materials into the water metering hopper 41 through the water pump 42, and meter the crushed stone through the water metering hopper 41 until the water in the water metering hopper 41 reaches the system preset range. (The feeding of various filling materials can be carried out simultaneously)

[0064] S2. Filling material mixing:

[0065] The first automatic control system controls the tail mortar metering hopper 22, the binder metering hopper 31, the water metering hopper 41 and the crushed stone metering hopper 51 to put the filling materials in a preset proportion into the mixing system 1; the mixing system 1 stirs and mixes various filling materials to prepare the filling slurry.

[0066] The following takes a certain mine filling as an example for illustration.

[0067] The filling slurry preparation system combining continuous feeding and static metering of the present invention is used for the filling slurry preparation process combining continuous feeding and static metering. The filling slurry preparation process combining continuous feeding and static metering includes the following steps: (The filling slurry is composed of tailings mortar, binder, crushed stones and water; and the ratios of tailings mortar, binder, crushed stones and water are preset in the system. Among them, the system preset values of tailings mortar include the mass m z of tailings mortar, the mass m w of tailings in the tailings mortar and the mass m s of water.)

[0068] S1. Feeding of filling materials:

[0069] S11. Open the first manual gate valve 214, the first electric gate valve 212, the second manual gate valve 238 and the third manual gate valve 245 (the manual gate valve is in the open state throughout the process), close the second electric gate valve 236 and the third electric gate valve 242. The tailings mortar in the thickener 211 continuously flows into the buffer mixing tank 231 through the connecting pipe and fills the buffer secondary tank 241.

[0070] As the tailings mortar continuously flows in, the liquid level of the tailings mortar in the buffer mixing tank 231 continuously rises until it rises to the plane where the first sensor 233 is located. At this time, the second automatic control system starts to work. The second automatic control system first monitors whether the discharge port at the bottom of the dischargeable metering bucket 232 is closed. If it is not closed, it first closes the discharge port at the bottom of the dischargeable metering bucket 232; then the second automatic control system controls the second electric gate valve 236 to open, and the tailings mortar in the buffer mixing tank 231 flows into the dischargeable metering bucket 232. When the liquid level of the tailings mortar in the buffer mixing tank 231 reaches the plane where the second sensor 234 is located, the liquid level of the tailings mortar in the dischargeable metering bucket 232 just reaches the plane where the third sensor 235 is located. At this time, the second automatic control system controls the second electric gate valve 236 to close, and at the same time controls the discharge port at the bottom of the dischargeable metering bucket 232 to open, and the tailings mortar flows from the dischargeable metering bucket 232 into the tailings mortar metering hopper 22. At this time, the tailings mortar metering hopper 22 measures the mass of the incoming tailings mortar.

[0071] (1) When the deviation between the measured value m c of the tailings mortar in the tailings mortar metering hopper 22 and the system preset value m z of the tailings mortar is within the allowable range of the system, the first automatic control system controls the tailings mortar metering hopper 22 to put the tailings mortar into the mixing system 1.

[0072] (2) When the measured value mc Deviation from the system preset value m of the tail mortar z is not within the range allowed by the system. At this time, the first automatic control system will compare the actual value m of the tailings in the tail mortar in the tail mortar metering hopper 22 1 with the system preset value m of the tailings w . If the deviation between the actual value m 1 and the system preset range m of the tailings w is within the range allowed by the system, it can be roughly considered that the tail mortar meets the metering requirements at this time, and the first automatic control system will also control the tail mortar metering hopper 22 to put the tail mortar into the mixing system 1. In this case, it is also necessary to compare the system preset value m of the water s with the actual value m of the water in the tail mortar metering hopper 22 2 , and deduct or add the corresponding water according to the deviation between the two (by adjusting the water metering hopper 41).

[0073] These comparison and adjustment processes are all realized by a computer. Calculation formulas are input in advance in the computer. The specific calculation formulas are as follows:

[0074] Given: The volume between the plane where the first sensor 233 is located and the plane where the second sensor 234 is located in the buffer mixing tank 231 is V 1 (fixed value), the volume flowing through per unit time measured by the first flowmeter 213 is Q 1 , the time S used for filling the tail mortar in the dischargeable metering bucket 232 from the bottom to the plane where the third sensor 235 is located 1 (adjustable value), the mass percentage content C of the tailings in the tail mortar measured by the first concentration meter 237 1 , the specific gravity of the tailings is △ 1 (fixed value);

[0075] Then: The volume V of the tail mortar in the dischargeable metering bucket 232 = V 1 +Q 1 ×S 1 , that is, the volume of the tail mortar put into the tail mortar metering hopper 22 by the main discharging system 23;

[0076] The specific gravity of the tail mortar in the tail mortar metering hopper 22

[0077] The actual value of the tailings in this part of the tail mortar

[0078] The actual value of the water in this part of the tail mortar

[0079]

[0080] (3) When the measured value m of the tail mortar in the tail mortar metering hopper 22 cDeviation from the system preset value m z is not within the range allowed by the system, and the actual value m of the tailings in the tailings mortar metering hopper 22 1 Deviation from the system preset value m w is also not within the range allowed by the system. At this time, there are two cases:

[0081] If the actual value m 1 is lower than the system preset value m w , it means that the content of tailings in the tailings mortar in the tailings mortar metering hopper 22 is insufficient. At this time, the first automatic control system controls the third electric gate valve 242 to open, and the tailings mortar in the buffer secondary bucket 241 enters the tailings mortar metering hopper 22 until the actual value m 1 Deviation from the system preset value m w is within the range allowed by the system. The first automatic control system controls the third electric gate valve 242 to close, and at the same time controls the tailings mortar metering hopper 22 to put the tailings mortar into the mixing system 1. At this time, it is also necessary to compare the system preset range m of water s with the actual value m of water in the tailings mortar metering hopper 22 3 (the water put into the tailings mortar metering hopper 22 by the main discharging system 23 and the supplementary discharging system 24 together), and deduct or add the corresponding water according to the deviation between the two (by adjusting the water metering hopper 41).

[0082] These comparison and adjustment processes are all realized by a computer. The calculation formula is input in the computer in advance. The specific calculation formula is:

[0083] Given that the volume of the tailings mortar flowing through per unit time measured by the second flowmeter 243 is Q 2 and the mass percentage of tailings in the tailings mortar in the buffer secondary bucket 241 measured by the second concentration meter 244 is C 2 ;

[0084] Then the tailings still needed in the mortar metering hopper 22 is m w -m 1 ;

[0085] The specific gravity of the tailings mortar in the buffer secondary bucket 241

[0086] Q 2 The tailings content in the volume of tailings mortar is △ 3 ×Q 2 ×C 2 ;

[0087] The opening time of the third electric gate valve 242

[0088] S 2 The mass of water flowing into the tailings mortar metering hopper 22 within the time 3×Q 2 ×S 2 ×(1 - C 2 );

[0089] The total mass of water in the tailings mortar measuring hopper 22 (the water put into the tailings mortar measuring hopper 22 by the main discharging system 23 and the supplementary discharging system 24 together)

[0090]

[0091] If the actual value m 1 is higher than the system preset value m w , it indicates that the content of tailings in the tailings mortar in the tailings mortar measuring hopper 22 is too high. At this time, the first automatic control system adjusts the preset values of the binder measuring hopper 31, the water measuring hopper 41, and the crushed stone measuring hopper 51 to make them reach the preset ratio again.

[0092] (The comparison and regulation process of the first automatic control system are all automatically realized)

[0093] S12. Turn on the switch of the screw feeder 32 to feed the binder into the binder measuring hopper 31, and measure the binder through the binder measuring hopper 31 until the binder in the binder measuring hopper 31 reaches the system preset value. The first automatic control system controls the binder measuring hopper 31 to put the binder into the mixing system 1.

[0094] S13. Turn on the switch of the belt feeder 52 to feed the crushed stone into the crushed stone measuring hopper 51, and measure the crushed stone through the crushed stone measuring hopper 51 until the crushed stone in the crushed stone measuring hopper 51 reaches the system preset value. The first automatic control system controls the crushed stone measuring hopper 51 to put the crushed stone into the mixing system 1.

[0095] S14. Turn on the water pump 42 to feed water into the water measuring hopper 41, and measure the water through the water measuring hopper 41 until the water in the water measuring hopper 41 reaches the system preset value. The first automatic control system controls the water measuring hopper 41 to put the water into the mixing system 1. (The feeding of various filling materials can be carried out simultaneously, and for the addition of other filling materials, the traditional static weighing method is directly adopted)

[0096] S2. Mixing of filling materials:

[0097] The first automatic control system controls the tailings mortar measuring hopper 22, the binder measuring hopper 31, the water measuring hopper 41, and the crushed stone measuring hopper 51 to put the filling materials in a preset ratio into the mixing system 1; the mixing system 1 stirs and mixes various filling materials to prepare the filling slurry. The prepared filling slurry is filled into the mine shaft in the form of self-flow or pumping.

[0098] In summary, the present invention provides a filling slurry preparation system and preparation process that combines continuous feeding and static metering. By setting up a buffer and intermittent feeding system, the tailings slurry continuous feeding system continuously feeds the tailings slurry into the buffer and intermittent feeding system. At the same time, the buffer and intermittent feeding system quantitatively feeds the tailings slurry into the tailings slurry metering hopper. Through the quantitative control of the buffer and intermittent feeding system and the metering of the tailings slurry metering hopper, under the dual control of the buffer and intermittent feeding system and the tailings slurry metering hopper, accurate metering of the tailings slurry is achieved; the direct impact of the electric gate valve by the high pressure and large flow rate of the thickener is converted into impacts in multiple regions, small volumes, low pressures, and small flow rates, reducing the wear of the electric gate valve and increasing the service life of the equipment.

[0099] The above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A filling slurry preparation system combining continuous feeding and static metering, characterized in that: it includes a feeding and metering system and a stirring system connected to the discharge port end of the feeding and metering system; the feeding and metering system includes a tailing slurry feeding and metering system, a binder feeding and metering system, a water feeding and metering system, and a crushed stone feeding and metering system; the tailing slurry feeding and metering system includes a tailing slurry continuous feeding system, a buffer and intermittent feeding system, and a tailing slurry metering hopper connected in sequence; the tailing slurry continuous feeding system continuously feeds the tailing slurry into the buffer and intermittent feeding system, and through the quantitative feeding of the buffer and intermittent feeding system, the tailing slurry is fed into the tailing slurry metering hopper to achieve the accurate metering of the tailing slurry; the filling slurry preparation system combining continuous feeding and static metering further includes a first automatic control system; the buffer and intermittent feeding system includes a main feeding system and a supplementary feeding system; the main feeding system feeds a fixed amount of tailing slurry into the tailing slurry metering hopper, and the first automatic control system controls the tailing slurry metering hopper to measure the mass of the tailing slurry entering the tailing slurry metering hopper. At the same time, by comparing the deviation between the tailing slurry in the tailing slurry metering hopper and the system preset value, the feeding amount of the supplementary feeding system is adjusted; the main feeding system includes a buffer stirring tank, a dischargeable metering tank, and a second automatic control system; the inlet end of the buffer stirring tank is connected to the discharge port end of the tailing slurry continuous feeding system, and the outlet end of the buffer stirring tank is connected to the dischargeable metering tank; the outlet end of the dischargeable metering tank is connected to the inlet end of the tailing slurry metering hopper; the second automatic control system controls the buffer stirring tank to quantitatively feed the tailing slurry into the dischargeable metering tank, and at the same time controls the dischargeable metering tank to quantitatively feed the tailing slurry into the tailing slurry metering hopper; the buffer stirring tank is sequentially provided with a first sensor and a second sensor from top to bottom on the tank wall; the dischargeable metering tank is provided with a third sensor on the tank wall; the second sensor and the third sensor are on the same horizontal plane; a second electric gate valve and a first concentration meter are provided on the connecting pipe between the buffer stirring tank and the dischargeable metering tank; the tailing slurry continuous feeding system continuously feeds the tailing slurry into the buffer stirring tank. When the tailing slurry liquid level in the buffer stirring tank reaches the plane where the first sensor is located, the second automatic control system controls the outlet of the dischargeable metering tank to close, and at the same time controls the second electric gate valve to open, and the tailing slurry in the buffer stirring tank flows into the dischargeable metering tank. When the tailing slurry liquid level in the buffer stirring tank reaches the plane where the second sensor is located, and the tailing slurry liquid level in the dischargeable metering tank reaches the plane where the third sensor is located, the second automatic control system controls the second electric gate valve to close, and at the same time controls the outlet of the dischargeable metering tank to open, and quantitatively feeds the tailing slurry into the tailing slurry metering hopper.

2. The filling slurry preparation system combining continuous feeding and static metering according to claim 1, characterized in that: The first automatic control system controls the tailings mortar feeding and metering system, the binder feeding and metering system, the water feeding and metering system, and the crushed stone feeding and metering system to discharge materials to the mixing system, and controls and adjusts the set operating parameters of each feeding and metering system.

3. The filling slurry preparation system combining continuous feeding and static metering according to claim 1, characterized in that: The supplementary feeding system includes a buffer secondary barrel; the feed inlet end of the buffer secondary barrel is connected to the discharge outlet end of the buffer mixing barrel, and the discharge outlet end is connected to the feed inlet end of the tailings mortar metering hopper; a third electric gate valve is provided on the connecting pipe between the buffer secondary barrel and the tailings mortar metering hopper; when the tailings mortar in the tailings mortar metering hopper is lower than the system preset value, the first automatic control system controls the third electric gate valve to open and discharge materials into the tailings mortar metering hopper until the tailings mortar in the tailings mortar metering hopper reaches the system preset value.

4. The filling slurry preparation system combining continuous feeding and static metering according to claim 3, characterized in that: A second flow meter and a second concentration meter are also provided on the connecting pipe between the buffer secondary barrel and the tailings mortar metering hopper. Through the joint control of the second flow meter, the second concentration meter and the tailings mortar metering hopper, the tailings mortar in the tailings mortar metering hopper reaches the system preset value, realizing the precise metering of the tailings mortar.

5. The filling slurry preparation system combining continuous feeding and static metering according to claim 1, characterized in that: The tailings mortar continuous feeding system includes a thickener; the discharge outlet of the thickener is connected to the feed inlet of the buffer mixing barrel, and the thickener continuously discharges materials into the buffer mixing barrel; a first electric gate valve and a first flow meter for measuring the flow rate of the tailings mortar are provided on the connecting pipe between the thickener and the buffer mixing barrel.

6. The filling slurry preparation system combining continuous feeding and static metering according to claim 2, characterized in that: The binder feeding and metering system includes a binder metering hopper; the water feeding and metering system includes a water metering hopper; the crushed stone feeding and metering system includes a crushed stone metering hopper.

7. A filling slurry preparation process combining continuous feeding and static metering, characterized in that: It is carried out by using the filling slurry preparation system combining continuous feeding and static metering according to claim 6, and includes the following steps: S1. Filling material feeding: S11. Feed materials into the tailings mortar metering hopper through the tailings mortar feeding and metering system, and measure the tailings mortar through the tailings mortar metering hopper until the tailings mortar in the tailings mortar metering hopper reaches the system preset value; S12. Feed materials into the binder metering hopper through the binder feeding and metering system, and measure the binder through the binder metering hopper until the binder in the binder metering hopper reaches the system preset value; S13. Feed materials into the crushed stone metering hopper through the crushed stone feeding and metering system, and measure the crushed stone through the crushed stone metering hopper until the crushed stone in the crushed stone metering hopper reaches the system preset value; S14. Feed the water metering hopper through the water feeding and metering system, and measure the crushed stones through the water metering hopper until the water in the water metering hopper reaches the system preset value; S2. Filling material mixing: The first automatic control system controls the tailings mortar metering hopper, the binder metering hopper, the water metering hopper and the crushed stone metering hopper to discharge materials into the mixing system; the mixing system mixes various filling materials to prepare a filling slurry.

8. The filling slurry preparation process combining continuous feeding and static metering according to claim 7, characterized in that: The step S11 is specifically as follows: the tailings mortar continuous feeding system continuously discharges tailings mortar into the main feeding system, and then the main feeding system discharges a certain amount of tailings mortar into the tailings mortar metering hopper. If the tailings mortar in the tailings mortar metering hopper is within the deviation range of the system preset value, the first automatic control system controls the tailings mortar metering hopper to discharge the tailings mortar into the mixing system; if the tailings mortar in the tailings mortar metering hopper is below the deviation range of the system preset value, the first automatic control system controls the supplementary feeding system to discharge materials into the tailings mortar metering hopper until the tailings mortar in the tailings mortar metering hopper reaches the system preset range, and then the first automatic control system controls the tailings mortar metering hopper to discharge the tailings mortar into the mixing system, and at the same time the first automatic control system correspondingly adjusts the discharge amount of the water metering hopper; if the tailings mortar in the tailings mortar metering hopper is above the deviation range of the system preset value, the first automatic control system correspondingly adjusts the discharge amounts of the other filling materials to make the various filling materials reach the preset ratio again to prepare a filling slurry.

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