A device for preparing a red mud-based filling material

Abstract

The utility model discloses a kind of preparation devices of red mud-based filling material, it is related to solid waste resource utilization and building material production equipment field, including being sequentially arranged along material flow: red mud supply unit, including red mud storehouse, double-shaft screw feeder is installed in the discharge end of red mud storehouse;Dry powder storage supply unit, including powder storehouse, screw weigher is installed in the discharge end of powder storehouse;Continuous type stirring host, continuous type stirring host includes cascade first-stage double-shaft mixer and second-stage single-shaft mixer;The feed inlet of first-stage double-shaft mixer is communicated with the discharge outlet of red mud supply unit and dry powder storage supply unit;The feed inlet of second-stage single-shaft mixer and the discharge outlet of first-stage double-shaft mixer are communicated, and the upper portion of second-stage single-shaft mixer is equipped with liquid adding port;Control unit is respectively connected with the signal of the driving device of double-shaft screw feeder, screw weigher, first-stage double-shaft mixer, second-stage single-shaft mixer.

Description

Technical Field

[0001] This utility model relates to the fields of solid waste resource utilization and building material production equipment, and in particular to a preparation device for red mud-based filling materials. Background Technology

[0002] Red mud is a highly alkaline solid waste produced during alumina production, with approximately 1.0-1.8 tons of red mud generated for every ton of alumina produced. Global red mud stockpiles are enormous and continue to increase. The high alkalinity and heavy metal content of red mud can lead to groundwater and soil pollution. To ensure the safe large-scale disposal and resource utilization of red mud, current treatment methods primarily involve modifying the red mud with materials such as gypsum, mineral powder, and activators, and then using it as a mine filling material.

[0003] With the application of bulk industrial solid wastes such as red mud in backfill materials, traditional intermittent mixing equipment has revealed many problems in its suitability:

[0004] The materials have complex properties: wet red mud is viscous and prone to caking, which can easily cause problems such as material sticking and blockage in traditional belt conveyors or bucket elevators. Powdered slag and gypsum are prone to dust generation.

[0005] Uneven mixing: The red mud and dry powder have large differences in density and particle size, making it difficult for conventional mixers to mix them evenly in a short time. This can easily lead to the formation of red mud clumps or powder clumps, which affects the material properties.

[0006] Capacity and efficiency limitations: Intermittent production mode (mixing one batch at a time) is inefficient and cannot meet the large-scale, continuous material supply needs of mine filling.

[0007] Therefore, there is an urgent need to develop a complete preparation device specifically designed for the characteristics of red mud-based materials, capable of continuous feeding, efficient mixing, and preventing sticking and dust dispersion. Utility Model Content

[0008] The purpose of this invention is to overcome the shortcomings of the prior art and provide a preparation device for red mud-based filling materials that is highly automated, mixes evenly, and can continuously produce materials.

[0009] An apparatus for preparing a red mud-based filling material includes the following components arranged sequentially along a material flow path:

[0010] A red mud feeding unit includes a red mud bin, and a twin-shaft screw feeder is installed at the discharge end of the red mud bin;

[0011] A dry powder material storage and supply unit includes a powder silo, and a screw weighing scale is installed at the discharge end of the powder silo.

[0012] A continuous mixing host, the continuous mixing host comprising a primary twin-shaft mixer and a secondary single-shaft mixer connected in series;

[0013] The feed inlet of the first-stage twin-shaft mixer is connected to the discharge outlet of the red mud feeding unit and the dry powder storage and feeding unit.

[0014] The feed inlet of the secondary single-shaft mixer is connected to the discharge outlet of the primary twin-shaft mixer, and the upper part of the secondary single-shaft mixer is provided with a liquid addition port;

[0015] The control unit is connected to the drive devices of the twin-shaft screw feeder, the screw metering scale, the first-stage twin-shaft mixer, and the second-stage single-shaft mixer, respectively.

[0016] Furthermore, both the red mud bin and the twin-screw feeder have their casings lined with ultra-high molecular weight polyethylene sheets.

[0017] Furthermore, the inner side of the casing of the primary twin-shaft mixer is equipped with a sensor for monitoring the state of the material.

[0018] Furthermore, the sensor is an ultrasonic level sensor or a microwave moisture meter.

[0019] Furthermore, the liquid addition port is connected to a liquid activator storage tank via a pipeline, and a water flow meter and a solenoid valve are installed on the pipeline. Both the water flow meter and the solenoid valve are signal-connected to the control unit.

[0020] Furthermore, all connection interfaces of the red mud-based filling material preparation device are sealed connections.

[0021] Furthermore, the control unit is a PLC controller.

[0022] Compared with the prior art, the beneficial technical effects of this utility model are as follows:

[0023] Continuous production: overcomes the drawbacks of intermittent production, has high production efficiency, and can be perfectly matched with continuous downhole filling operations.

[0024] Highly targeted: Specifically designed for the "sticky and wet" characteristics of red mud and the "fine and dry" characteristics of mineral powder, the dual-shaft feeder prevents sticking, and the two-stage mixing (dry mixing first and then wet mixing) ensures uniform mixing and eliminates clumping.

[0025] Automation and Precision Control: Through PLC system integration control, precise proportioning and linkage adjustment of various solid and liquid materials are achieved, resulting in stable and reliable product quality.

[0026] Environmentally friendly and clean: The fully sealed design effectively controls alkaline dust pollution and improves the working environment. Attached Figure Description

[0027] The present invention will be further described below with reference to the accompanying drawings.

[0028] Figure 1 This is a schematic diagram of the preparation device for the red mud-based filling material of this utility model.

[0029] Explanation of reference numerals in the attached drawings: 1. Red mud feeding unit; 11. Red mud bin; 12. Twin-shaft screw feeder; 2. Dry powder storage and supply unit; 21. Powder bin; 22. Screw weighing scale; 3. Continuous mixing host; 31. First-stage twin-shaft mixer; 32. Second-stage single-shaft mixer; 311. Sensor; 321. Liquid addition port; 322. Liquid activator storage tank; 323. Water flow meter; 324. Solenoid valve; 4. Control unit. Detailed Implementation

[0030] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0031] like Figure 1 As shown, an apparatus for preparing a red mud-based filling material includes the following components arranged sequentially along the material flow path:

[0032] The red mud feeding unit 1 includes a red mud bin 11, and a twin-shaft screw feeder 12 is installed at the discharge end of the red mud bin 11.

[0033] The dry powder storage and supply unit 2 includes a powder silo 21, and a screw weighing scale 22 is installed at the discharge end of the powder silo 21.

[0034] The continuous mixing host 3 includes a primary twin-shaft mixer 31 and a secondary single-shaft mixer 32 connected in series.

[0035] The feed inlet of the first-stage twin-shaft mixer 31 is connected to the discharge outlet of the red mud feeding unit 1 and the dry powder storage and feeding unit 2.

[0036] The feed inlet of the secondary single-shaft mixer 32 is connected to the discharge outlet of the primary twin-shaft mixer 31, and the upper part of the secondary single-shaft mixer 32 is provided with a liquid addition port 321.

[0037] The control unit 4 is connected to the drive devices of the twin-shaft screw feeder 12, the screw weighing scale 22, the first-stage twin-shaft mixer 31, and the second-stage single-shaft mixer 32.

[0038] In specific implementation, multiple dry powder storage and supply units 2 can be set up. Among them, the powder silo 21 can be used to store dry powders such as mineral powder and gypsum. The powder silo 21 is equipped with a silo cover to prevent dust from escaping.

[0039] The feed inlet of the primary twin-shaft mixer 31 receives red mud from the red mud feeding unit 1 and dry powder from the dry powder storage and supply unit 2. The primary twin-shaft mixer 31 has multiple sets of counter-rotating mixing blades on its internal twin shafts to perform forced shearing and convective mixing of the viscous red mud and dry powder, thus completing the dry mixing process.

[0040] The two-stage single-shaft mixer 32 is equipped with turbine blades, which are used to shear and stir water, activator solution and dry mixture at high speed to complete the wet mixing homogenization process and finally form a uniform slurry.

[0041] Specifically, the housings of both the red mud bin 11 and the twin-screw feeder 12 are lined with ultra-high molecular weight polyethylene sheets.

[0042] The ultra-high molecular weight polyethylene sheet is used to prevent sticking.

[0043] In practice, a wall vibrator can be installed on the outer wall of the red mud bin 11 to break the arch.

[0044] Specifically, the inner side of the casing of the primary twin-shaft mixer 31 is equipped with a sensor 311 for monitoring the state of the material.

[0045] Specifically, the sensor 311 is an ultrasonic level sensor or a microwave moisture meter, used to monitor the level and moisture content of the mixture in real time, and feed the signal back to the control system as the basis for adjusting the water supply in the subsequent secondary single-shaft mixer 32.

[0046] Specifically, the liquid addition port 321 is connected to a liquid activator storage tank 322 via a pipeline. A water flow meter 323 and a solenoid valve 324 are installed on the pipeline. Both the water flow meter 323 and the solenoid valve 324 are signal connected to the control unit 4.

[0047] In specific implementation, a water inlet pipe can also be set at the liquid addition port 321. A solenoid valve connected to the control unit 4 is installed on the water inlet pipe, which, together with the sensor 311 in the first-stage dual-shaft mixer 31, enables controllable water inlet adjustment.

[0048] Specifically, the connection interfaces of the preparation device for the red mud-based filling material are sealed connections.

[0049] Specifically, the control unit 4 is a PLC controller.

[0050] The control unit 4 also includes a human-machine interface. The PLC controller and the human-machine interface are used to automatically adjust the feeding speed of each material according to the preset ratio to achieve automatic continuous production.

[0051] The workflow of this system is as follows:

[0052] Wet red mud is stored in red mud bin 11 and is stably and evenly fed out by a twin-shaft screw feeder 12 under the bin (the flow rate is controlled by a variable frequency motor). Dry powder materials such as slag powder and desulfurized gypsum are stored in multiple powder bins 21 and are accurately measured by a screw weighing scale 22 at the bottom before being fed out.

[0053] Red mud and dry powder are fed together into a primary twin-shaft mixer 31 for thorough dry premixing. The mixed material then falls into a secondary single-shaft mixer 32. Simultaneously, water and a liquid activator (a pre-prepared solution) are pumped into the secondary single-shaft mixer 32 at a set flow rate through a liquid inlet 321. Under the intense agitation of the high-speed turbine, all components are mixed into a homogeneous slurry in a very short time.

[0054] The slurry flows out from the discharge port of the secondary single-shaft mixer 32 and can be directly transported to the filling wellhead through pipeline or loaded into a mixing transport vehicle.

[0055] The speed of all feeding equipment in the entire process is centrally controlled by a PLC controller. Operators only need to set the target ratio and output on the human-machine interface, and the system can run automatically.

[0056] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0057] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A device for preparing a red mud-based filling material, characterized in that, Including those set sequentially along the material flow: A red mud feeding unit includes a red mud bin, and a twin-shaft screw feeder is installed at the discharge end of the red mud bin; A dry powder material storage and supply unit includes a powder silo, and a screw weighing scale is installed at the discharge end of the powder silo. A continuous mixing host, the continuous mixing host comprising a primary twin-shaft mixer and a secondary single-shaft mixer connected in series; The feed inlet of the first-stage twin-shaft mixer is connected to the discharge outlet of the red mud feeding unit and the dry powder storage and feeding unit. The feed inlet of the secondary single-shaft mixer is connected to the discharge outlet of the primary twin-shaft mixer, and the upper part of the secondary single-shaft mixer is provided with a liquid addition port; The control unit is connected to the drive devices of the twin-shaft screw feeder, the screw metering scale, the first-stage twin-shaft mixer, and the second-stage single-shaft mixer, respectively.

2. The apparatus for preparing red mud-based filling material according to claim 1, characterized in that: Both the red mud bin and the twin-screw feeder have their casings lined with ultra-high molecular weight polyethylene sheets.

3. The apparatus for preparing red mud-based filling material according to claim 1, characterized in that: The inner side of the casing of the primary twin-shaft mixer is equipped with sensors for monitoring the state of the materials.

4. The apparatus for preparing red mud-based filling material according to claim 3, characterized in that: The sensor is an ultrasonic level sensor or a microwave moisture meter.

5. The apparatus for preparing red mud-based filling material according to claim 1, characterized in that: The liquid addition port is connected to a liquid activator storage tank via a pipeline. A water flow meter and a solenoid valve are installed on the pipeline, and both the water flow meter and the solenoid valve are signal-connected to the control unit.

6. The apparatus for preparing red mud-based filling material according to claim 1, characterized in that: The connection interfaces of the red mud-based filling material preparation device are sealed.

7. The apparatus for preparing red mud-based filling material according to claim 1, characterized in that: The control unit is a PLC controller.

Images