A waste rock cemented simple filling system

Abstract

The utility model discloses a kind of waste rock cementation simple filling systems, belong to mine filling mining technical field.The utility model aims at solving the problems of unstable filling body quality, coarse aggregate slurry conveying difficulty, serious pipeline wear and high cost in existing waste rock filling technology.The system includes waste rock crushing storage and feeding system, cementing material storage feeding system, intermittent preparation system, slurry conveying system and metering control system.Its core is that mining waste rock is made into aggregate less than 6mm by two-stage crushing, and high concentration slurry is made in mixer according to accurate proportioning with cementing material, water, additive etc., and concrete conveying drag pump is used to replace traditional filling industrial pump, and slurry is pumped to underground goaf through pipeline.The utility model has the characteristics of simple process flow, low cost and convenient operation, effectively solves the conveying problem of coarse aggregate high concentration slurry, reduces the risk of pipeline blockage, and ensures the stability of filling body quality.

Description

Technical Field

[0001] This utility model relates to the field of mining technology, specifically to a simple waste rock cementation backfilling system. Background Technology

[0002] Mining waste rock generated during the mining process, if piled on the surface, not only occupies a large amount of land but may also cause environmental and safety risks such as landslides and dust storms. Using waste rock as aggregate to backfill underground goaf areas is an important way to realize the resource utilization of mine solid waste and promote the construction of green mines.

[0003] Currently, there are two main methods for cemented backfilling of waste rock:

[0004] Waste rock cement slurry backfilling: This method involves separately transporting waste rock and cement slurry to the goaf for mixing. Its advantages are simple process and low cost. However, its disadvantages are also significant: the ratio of waste rock to cement slurry is difficult to control precisely, and the slurry's penetration within the waste rock pile depends on the porosity of the waste rock and the fluidity of the slurry, making it difficult to guarantee the quality of the final backfill.

[0005] Cemented waste rock backfill: This method is similar to concrete preparation, where crushed waste rock is mixed with materials such as cement and then pumped through pipelines or allowed to flow by gravity to the goaf. This method allows for precise measurement of material proportions, resulting in higher strength and better quality backfill. However, this method also presents challenges. To control equipment and costs, the crushed waste rock particle size is usually relatively large, which leads to difficulties in conveying the slurry in pipelines, easy segregation, and severe wear on the pipelines, especially when conveying high concentrations, where flow resistance increases significantly.

[0006] In summary, existing waste rock cemented backfilling technology faces three major technical challenges: insufficient strength of the backfill body due to unreasonable waste rock gradation, high cost of cementitious materials, and difficulty in transporting coarse-particle slurry. Utility Model Content

[0007] The purpose of this utility model is to provide a simple waste rock cemented backfilling system to solve the technical problems of insufficient strength of the backfill body due to unreasonable waste rock gradation, high cost of cementing materials, and difficulty in conveying coarse particle slurry in traditional waste rock cemented backfilling technology.

[0008] To achieve the above objectives, the technical solution adopted by this utility model is: to provide a simple waste rock cemented backfilling system, the waste rock cemented backfilling system comprising:

[0009] Waste rock processing units for crushing and processing quarry waste rock into aggregates of predetermined particle size; and,

[0010] The material storage and supply unit includes an aggregate bin for storing the aggregate, a powder bin for storing the cementitious material, a production water tank, and an admixture storage device.

[0011] The metering and preparation unit includes metering equipment connected to the outlets of the aggregate bin and the powder bin, and a mixer for mixing aggregate, cementitious material, water and admixtures metered according to a preset ratio.

[0012] The buffer and conveying unit includes a slurry buffer silo located below the mixer and a concrete conveying trailer pump connected to the outlet of the slurry buffer silo. The concrete conveying trailer pump conveys the prepared slurry to the underground goaf through a filling pipeline.

[0013] In one embodiment, the aggregate particle size processed by the crushing system in the waste rock treatment unit is less than 6 mm.

[0014] In one embodiment, the mixer is a twin-shaft horizontal mixer.

[0015] In one embodiment, the system further includes an online monitoring system for real-time monitoring of the slurry preparation and conveying process.

[0016] In one embodiment, the metering device is a bone feeder.

[0017] The above-described technical solutions in the embodiments of this utility model have at least the following technical effects or advantages:

[0018] The simplified waste rock cemented backfilling system provided in this embodiment simplifies equipment configuration and process flow by replacing traditional industrial backfilling pumps with a mature concrete conveying trailer pump, reducing initial investment and operating costs. Through optimized aggregate gradation (less than 6mm) and high-concentration slurry ratio (81-83% by mass), combined with the concrete conveying trailer pump, it effectively solves the problem of conveying high-concentration slurry with coarse aggregate, reducing the risk of pipe blockage and pipeline wear. Furthermore, the system employs static metering, allowing precise control of material ratios and ensuring the uniformity and stability of the slurry, thereby guaranteeing the strength and quality of the final backfill. Finally, it achieves on-site resource utilization of mining waste rock underground, reducing land occupation and environmental risks associated with surface stockpiling, aligning with the concept of green mining development. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model, 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 this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 A schematic diagram of the process flow of the simple waste rock cementation backfilling system provided in this embodiment of the utility model. Detailed Implementation

[0021] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0022] In the description of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0024] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0025] Please see Figure 1This application provides a simplified waste rock cementing backfilling system, which adopts a process mode of static metering, periodic preparation, and continuous conveying. The system mainly consists of a waste rock processing unit, a material storage and supply unit, a metering and preparation unit, and a buffering and conveying unit.

[0026] The waste rock processing unit is responsible for transforming raw mining waste rock into finished aggregate that meets backfill requirements. Its physical structure consists of a series of continuously operating equipment, specifically including receiving and temporary storage structures, feeding equipment, crushing systems, and conveying and storage structures.

[0027] The receiving and temporary storage structure includes a waste rock dump for receiving and temporarily storing large chunks of quarry waste rock transported by truck.

[0028] The feeding equipment is usually a loader, which is responsible for grabbing the raw materials from the waste rock dump and feeding them into the feed inlet of the crushing system.

[0029] The crushing system is the core of this unit. It consists of two-stage crushing equipment connected in series and can process waste rock into aggregate with a particle size of less than 6mm.

[0030] The conveying and storage structure is used to transport the crushed finished aggregate to the finished product stockpile for storage via belt conveyor for later use.

[0031] The material storage and supply unit is responsible for centrally storing various raw materials required for slurry preparation and supplying them to the metering unit according to instructions. Its structure consists of multiple independent storage containers and auxiliary equipment, specifically including aggregate storage and supply department, cementitious material storage and supply department, water supply storage department, and admixture storage department.

[0032] The aggregate storage and supply unit includes an aggregate bin for storing finished aggregates. The bin is typically a steel structure with a receiving port at the top, into which a loader feeds aggregates from the finished product yard. A discharge port is located at the bottom of the bin.

[0033] The cementitious material storage and supply section mainly consists of one or more enclosed powder silos (usually cement silos), which are fed by pneumatic conveying from tank trucks. A conveying screw is connected to the bottom outlet for metered output of the powder.

[0034] The water supply storage section is a production water tank, which serves as a water source reserve for the preparation of slurry.

[0035] The admixture storage section consists of dedicated admixture storage tanks or ton containers used to store liquid additives such as polycarboxylate superplasticizers.

[0036] The metering and preparation unit is crucial for ensuring the quality of the filling slurry, responsible for the precise proportioning and uniform mixing of each component. It has a compact structure, arranged in a hierarchical manner, and specifically includes metering and preparation structures.

[0037] Among them, the metering structure adopts a static metering method and consists of multiple independent weighing devices, including an aggregate batching device (aggregate metering hopper) located below the aggregate bin, a powder metering scale at the outlet of the conveying spiral of the powder bin, and a water metering scale and an admixture metering scale respectively supporting the production water tank and the admixture storage tank.

[0038] The core equipment of the preparation structure is a double-shaft horizontal mixer. This mixer is located below all metering devices, and its top is provided with a feed inlet for receiving all accurately metered materials. Through the forced stirring of two horizontal stirring shafts in the machine body, the materials are mixed to prepare a uniform slurry.

[0039] The buffer and conveying unit is responsible for buffering the prepared slurry and continuously pumping it to the underground at high pressure. Its structure reflects the technological characteristics of "periodic preparation and continuous conveying". The buffer and conveying unit specifically includes a buffer structure, a conveying pump, and a conveying pipeline.

[0040] The buffer structure includes a slurry buffer bin, which is directly set below the double-shaft horizontal mixer for receiving the slurry discharged after stirring. This buffer bin has a certain taper and may be equipped with a stirring device to prevent segregation, providing a stable and continuous material source for the subsequent trailer pump.

[0041] The conveying pump includes a concrete conveying trailer pump, whose suction port is connected to the discharge port of the slurry buffer bin. This device replaces the traditional filling industrial pump and is specifically designed for pumping high-concentration slurries containing aggregates with a particle size less than 6mm.

[0042] The conveying pipeline is a wear-resistant pipeline system connected to the outlet of the trailer pump, responsible for transporting the slurry from the ground filling station to the designated goaf underground.

[0043] The specific technological process of the waste rock cementing simple filling system provided by this application is as follows:

[0044] 1. Waste rock treatment: Trucks transport the excavated waste rock to the waste rock yard. The loader feeds the waste rock into the crushing system. After two-stage crushing, the waste rock is processed into aggregates with a particle size less than 6mm, and the content of fine powder (the part with a particle size less than a specific value) is controlled at 25 - 35%. The crushed finished aggregates are transported to the finished product yard by a belt conveyor.

[0045] 2. Material preparation: The loader transfers the aggregates from the finished product yard to the aggregate bin. At the same time, tank trucks transport cement and other cementitious materials to the powder bin for standby.

[0046] 3. Metering and stirring: After the system is started, the aggregates and powders are accurately weighed through the metering hoppers below them respectively, and then put into the double-shaft horizontal mixer. At the same time, the water and admixture in the production water tank are also metered and added to the mixer.

[0047] 4. Slurry preparation: All materials are thoroughly mixed in a mixer to prepare a high-concentration, high-flowability slurry with a mass concentration of 81-83% and a slump of 26-28cm.

[0048] 5. Buffering and Pumping: The prepared slurry is discharged into the slurry buffer silo below, which serves to buffer and stabilize the supply. Subsequently, the concrete conveying trailer pump draws the slurry from the buffer silo and pumps it through pipelines to the goaf area to be filled underground.

[0049] In this embodiment, the cementitious material consists of 20% cement and 0.25% (by mass of cement) polycarboxylate superplasticizer. The filling material prepared using this system achieves a 3-day strength of over 1.5 MPa, a 28-day strength of no less than 3.0 MPa, and a bleeding rate of less than 5%. The entire system is monitored and controlled in real time through a central control system to ensure continuous and stable production.

[0050] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A simple waste rock cemented backfilling system, characterized in that, The simple waste rock cemented backfill system includes: Waste rock processing units for crushing and processing quarry waste rock into aggregates of predetermined particle size; and, The material storage and supply unit includes an aggregate bin for storing the aggregate, a powder bin for storing the cementitious material, a production water tank, and an admixture storage device. The metering and preparation unit includes metering equipment connected to the outlets of the aggregate bin and the powder bin, and a mixer for mixing aggregate, cementitious material, water and admixtures metered according to a preset ratio. The buffer and conveying unit includes a slurry buffer silo located below the mixer and a concrete conveying trailer pump connected to the outlet of the slurry buffer silo. The concrete conveying trailer pump conveys the prepared slurry to the underground goaf through a filling pipeline.

2. The simple waste rock cemented backfilling system according to claim 1, characterized in that: The aggregate particle size after being processed by the crushing system in the waste rock treatment unit is less than 6 mm.

3. The simple waste rock cemented backfilling system according to claim 1, characterized in that: The mixer is a twin-shaft horizontal mixer.

4. The simple waste rock cemented backfilling system according to claim 1, characterized in that: The system also includes an online monitoring system for real-time monitoring of the slurry preparation and conveying process.

5. The simple waste rock cemented backfilling system according to claim 1, characterized in that: The metering device is a bone material batching device.

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