A red mud based filling slurry preparation device and method

Abstract

This application discloses a red mud-based filling slurry preparation apparatus and method, relating to the field of filling material technology. The preparation apparatus includes: a feeder outlet connected to a red mud inlet of a mixing tank A; in the mixing tank A, red mud material entering through the red mud inlet of the mixing tank A and preparation water entering through the preparation water inlet A are stirred and mixed to initially dilute the red mud material; the red mud slurry outlet of the mixing tank A is connected to the inlet of a slurry pump A; the outlet of the slurry pump A is connected to the red mud slurry inlet of a thickener; the underflow outlet of the thickener is connected to the inlet of a slurry pump B; the outlet of the slurry pump B is connected to the red mud slurry inlet of the mixing tank B; and a preparation water inlet B is connected to the red mud slurry inlet of the mixing tank B. This application is applicable to red mud-based filling slurry preparation scenarios.

Description

Technical Field

[0001] This application relates to the field of filling material technology, and in particular to a red mud-based filling slurry preparation apparatus and preparation method. Background Technology

[0002] Red mud is a large amount of solid waste generated during the production of alumina from bauxite. Because it contains a certain amount of harmful components such as alkali and heavy metals, long-term stockpiling can easily cause environmental pollution and land occupation. Red mud particles are extremely fine and have high water retention capacity. In the process of large-scale, safe and resource-based utilization of red mud, it is difficult to carry out rapid thickening treatment, resulting in low efficiency in preparing red mud materials into filling slurry. Summary of the Invention

[0003] In view of this, the present application provides a red mud-based filling slurry preparation apparatus and preparation method, which can improve the efficiency of preparing red mud materials into filling slurry.

[0004] In a first aspect, embodiments of this application provide a red mud-based filling slurry preparation apparatus, comprising: a feeder having an inlet and an outlet; a mixing tank A having a red mud inlet, a preparation water inlet A, and a red mud slurry outlet; the outlet of the feeder being connected to the red mud inlet of the mixing tank A; in the mixing tank A, red mud material entering through the red mud inlet of the mixing tank A and preparation water entering through the preparation water inlet A are stirred and mixed to initially dilute the red mud material; and a slurry pump A, used for the red mud slurry outlet of the mixing tank A. The feed inlet is connected to the inlet of the slurry pump A; a thickener, the thickener having a red mud slurry inlet and an underflow outlet; the outlet of the slurry pump A is connected to the red mud slurry inlet of the thickener; a slurry pump B, the underflow outlet of the thickener being connected to the inlet of the slurry pump B; a mixing tank B, the mixing tank B having a red mud slurry inlet, a cementitious material inlet and a filling slurry outlet, the outlet of the slurry pump B being connected to the red mud slurry inlet of the mixing tank B; and a preparation water inlet B, the preparation water inlet B being connected to the red mud slurry inlet of the mixing tank B.

[0005] Optionally, the preparation device further includes a flocculant additive, the thickener is provided with a flocculant inlet, the flocculant additive is connected to the flocculant inlet of the thickener, and the flocculant is a polyacrylamide-based polymeric flocculant.

[0006] Optionally, the preparation apparatus further includes a curing agent additive, and the mixing tank B is also provided with a curing agent inlet. The outlet of the curing agent additive is connected to the curing agent inlet of the mixing tank B. The curing agent is a composite curing material containing at least one of sulfate, phosphate, and silicate.

[0007] Optionally, the preparation apparatus further includes a water storage tank A, which has an inlet and an outlet; the inlet of the water storage tank A is connected to the overflow outlet of the thickener, and the outlet of the water storage tank A is connected to the preparation water inlet A and the preparation water inlet B.

[0008] Optionally, the preparation apparatus further includes a controller, a detection component A, and a preparation water pump A. The controller is electrically connected to the detection component A, the feeder, and the preparation water pump A. The detection component A is located between the outlet of the slurry pump A and the red mud slurry inlet of the thickener, and is used to detect the flow rate and concentration of the red mud slurry output from the outlet of the slurry pump A. The controller adjusts the input of the feeder and the preparation water pump A based on the detection data of the detection component A.

[0009] Optionally, the preparation apparatus further includes a detection component B and a preparation water pump B. The controller is electrically connected to the detection component B, the thickener, and the preparation water pump B. The detection component B is located between the outlet of the slurry pump B and the red mud slurry inlet of the mixing tank B, and is used to detect the flow rate and concentration of the red mud underflow output from the outlet of the slurry pump B. The controller adjusts the input of the preparation water pump B based on the detection data of the detection component B.

[0010] Optionally, the preparation apparatus further includes a dilution water pump; the thickener is also provided with a dilution water inlet, and the dilution water pump is connected to the dilution water inlet of the thickener; the controller is electrically connected to the dilution water pump, and the controller adjusts the input of the dilution water pump according to the detection data of the detection component A.

[0011] Secondly, embodiments of this application provide a method for preparing red mud-based filling slurry, comprising: inputting red mud material into a mixing tank A, and inputting preparation water A into the mixing tank A for dilution and stirring to obtain red mud slurry of concentration A; pumping the red mud slurry of concentration A into a thickener through a slurry pump A, and thickening and settling the red mud slurry of concentration A in the thickener to form red mud slurry of concentration B; pumping the red mud slurry of concentration B in the thickener into a mixing tank B through a slurry pump B; inputting cementitious material into the mixing tank B, and inputting preparation water B into the mixing tank B, while stirring, to obtain filling slurry.

[0012] Optionally, during the thickening and settling process of the red mud slurry of concentration A in the thickener, the method further includes: diluting the red mud slurry of concentration A in the thickener until a red mud slurry of concentration C is obtained; and adding flocculant to the thickener while obtaining the red mud slurry of concentration C.

[0013] Optionally, the preparation method further includes: real-time detection of whether the concentration A of the red mud slurry output by the slurry pump A meets the concentration requirement A; if it does not meet the concentration requirement A, adjusting the amount of red mud material and / or preparation water A input into the mixing tank A; real-time detection of whether the concentration B of the red mud slurry output by the slurry pump B meets the concentration requirement B; if it does not meet the concentration requirement B, adjusting the amount of cementing material and / or preparation water B input into the mixing tank B.

[0014] This application provides a red mud-based filling slurry preparation apparatus and method. In a mixing tank A, red mud material fed through a feeder and preparation water fed through a preparation water inlet A are stirred and mixed to initially dilute the red mud material into a red mud slurry of suitable concentration. This ensures the fluidity of the red mud slurry, facilitating its transport to subsequent processing equipment and shortening the processing time in the thickener, thus improving the thickener's processing efficiency. The red mud slurry is further processed in the thickener to form a red mud slurry underflow of suitable concentration, which is beneficial for transporting to a mixing tank B for stirring and forming an easily solidified filling slurry. In a mixing tank B, cementitious material fed through a cementitious material inlet and preparation water fed through a preparation water inlet B are stirred together with the red mud slurry underflow to form a filling slurry suitable for filling, thereby improving the efficiency of preparing red mud material into filling slurry. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of a red mud-based filling slurry preparation device according to an embodiment of this application; Figure 2 This is a schematic diagram of a method for preparing red mud-based filling slurry according to an embodiment of this application; In the diagram: 10. Feeder; 11. Inlet; 12. Outlet; 20. Mixing tank A; 21. Red mud inlet; 22. Preparation water inlet A; 23. Red mud slurry outlet; 40. Slurry pump A; 50. Thickener; 51. Red mud slurry inlet A; 52. Underflow outlet; 53. Flocculant inlet; 60. Slurry pump B; 70. Mixing tank B; 71. Red mud slurry inlet B; 72. Cementitious material inlet; 73. Filler slurry outlet. 74. Curing agent inlet; 80. Preparation water inlet B; 90. Flocculant additive; 100. Curing agent additive; 110. Water storage tank A; 111. Water inlet; 112. Water outlet; 120. Detection component A; 121. Flow meter A; 122. Concentration meter A; 130. Detection component B; 131. Flow meter B; 132. Concentration meter B; 140. Detection and adjustment component C; 141. Flow meter C; 142. Electric regulating valve A. Detailed Implementation

[0017] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0018] It should be understood that the described embodiments are merely some, not all, of the embodiments in this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0019] Example 1 See Figure 1This application provides a red mud-based filling slurry preparation device, comprising: a feeder 10, the feeder 10 having an inlet 11 and an outlet 12; a mixing tank A20, the mixing tank A20 having a red mud inlet 21, a preparation water inlet A22, and a red mud slurry outlet 23; the outlet 12 of the feeder 10 is connected to the red mud inlet 21 of the mixing tank A20; in the mixing tank A20, the red mud material entering through the red mud inlet 21 of the mixing tank A20 and the preparation water entering through the preparation water inlet A22 are stirred and mixed to initially dilute the red mud material; and a slurry pump A40, the red mud slurry outlet 23 of the mixing tank A20 being connected to the slurry pump A40. The following components are connected to the inlet of the slurry pump A40: a thickener 50, which has a red mud slurry inlet A51 and an underflow outlet 52; the outlet of the slurry pump A40 is connected to the red mud slurry inlet A51 of the thickener 50; a slurry pump B60, which has the underflow outlet 52 of the thickener 50 connected to the inlet of the slurry pump B60; a mixing tank B70, which has a red mud slurry inlet B71, a cementitious material inlet 72, and a filling slurry outlet 73, and the outlet of the slurry pump B60 is connected to the red mud slurry inlet B71 of the mixing tank B70; and a preparation water inlet B80, which is connected to the red mud slurry inlet B71 of the mixing tank B70.

[0020] In this embodiment, the red mud material is uniformly fed from the red mud inlet 21 of the mixing tank A20 to the mixing tank A20 by the feeder 10. Simultaneously, preparation water is introduced into the mixing tank A20 through the preparation water inlet A22. The red mud material and preparation water are stirred and mixed in the mixing tank A20, and the red mud material is initially diluted to form a red mud slurry of suitable concentration, ensuring the fluidity of the slurry and facilitating its transport to the thickener 50 via the slurry pump A40 and pipelines for processing. The red mud material has extremely fine particles and high water retention capacity, with a large specific surface area and high surface energy, making it prone to agglomeration. If the red mud material is directly mixed with the cementitious material, the agglomerates will contain dry powder, making water penetration difficult, resulting in prolonged effective mixing time and low efficiency. The thickener 50 will then struggle to thicken the red mud material or slurry with high concentrations. The red mud material is then transported to the mixing tank A20. During the initial dilution in thickener 50, the fluid shear force of the preparation water effectively breaks up the agglomerates of red mud material, achieving primary dispersion of particles. This shortens the processing time of the red mud slurry in thickener 50 and improves the efficiency of thickener 50 in processing the red mud slurry. Further processing of the red mud slurry in thickener 50 forms a red mud slurry underflow of suitable concentration, which is then transported from underflow outlet 52 of thickener 50 and slurry pump B60 to mixing tank B70. This facilitates mixing in mixing tank B70 and the formation of easily solidified filling slurry. Cementitious material is added to mixing tank B70 through cementitious material inlet 72 via cementitious material additive, and preparation water is added to mixing tank B70 through preparation water inlet B80. In mixing tank B70, the cementitious material, preparation water, and red mud slurry underflow are mixed together to form a filling slurry suitable for filling, thereby improving the efficiency of preparing red mud material into filling slurry.

[0021] In some embodiments, the outlet 112 of the water storage tank A110 is connected via a pipeline to the pipeline between the outlet of the slurry pump B60 and the red mud slurry inlet B71 of the mixing tank B70. This allows the preparation water flowing from the outlet 112 of the water storage tank A110 to be pre-mixed in the pipeline between the outlet of the slurry pump B60 and the red mud slurry inlet B71 of the mixing tank B70. In the mixing tank B70, only the pre-mixed and homogenized red mud slurry needs to be dispersed, improving the mixing efficiency of the red mud slurry in the mixing tank B70 and avoiding the need for dispersion treatment of the red mud slurry from the thickener 5. The high-concentration red mud slurry output from pump B60 becomes blocked in the pipeline between the outlet of slurry pump B60 and the red mud slurry inlet B71 of the mixing tank B70. Before entering the red mud slurry inlet B71, the red mud slurry is premixed with the preparation water B, so that the red mud slurry can enter the mixing tank B70 with a stable concentration and viscosity. This prevents sudden changes in stirring resistance and splashing of red mud slurry material caused by the high-concentration red mud slurry and the preparation water B entering the mixing tank B70 separately. This is suitable for the stable power operation of each device in continuous production, ensuring the consistent quality of the prepared filling slurry.

[0022] In some embodiments, a red mud slurry with a water content of 10-20% and a mass concentration of 80-90% is fed into a mixing tank A20 via a dual feeder 10, and preparation water A is introduced into the mixing tank A20 for initial dilution, with a dilution range of 20-40%, thereby obtaining a red mud slurry with a concentration of 40-70%. Then, the red mud slurry with a concentration of 40-70% is fed into a thickener 50 via a slurry pump A40 for thickening treatment. The red mud slurry with a mass concentration range of 40-70% can ensure the fluidity of the red mud slurry, which is convenient for the red mud slurry to flow in the slurry pump A40 and the pipeline, and can also improve the efficiency of the red mud slurry in the thickener 50 for thickening treatment.

[0023] In some embodiments, the cementing material is silicate cement, which serves as the main source of strength for the filling material. The cementing material, together with the red mud slurry underflow output from the thickener 50 and the preparation water input from the preparation water inlet B80, is thoroughly stirred in the mixing tank B70 to form a homogeneous, stable, and pumpable red mud cemented filling slurry.

[0024] In some embodiments, the preparation apparatus further includes a flocculant additive 90, and the thickener 50 is provided with a flocculant inlet 53. The flocculant additive 90 is connected to the flocculant inlet 53 of the thickener 50, and the flocculant is a polyacrylamide-based polymeric flocculant. The flocculant is added to the thickener 50 through the flocculant additive 90 to promote the rapid sedimentation and concentration of fine red mud particles, forming clear overflow water and high-concentration red mud slurry underflow, thereby obtaining a red mud slurry underflow of suitable concentration.

[0025] In some embodiments, the red mud slurry is thickened to a concentration of 58-62% in the thickener 50, and then the red mud slurry underflow with a concentration of 58-62% is conveyed to the mixing tank B70 to meet the strength requirements of the filling body formed by the filling slurry; in the mixing tank B70, the red mud slurry underflow, the cementing material and the preparation water B are stirred together to form a filling slurry with a concentration of 60-62%.

[0026] Residual free alkali and potentially harmful components in the red mud material may be released with the backfill water, polluting the underground environment. In some embodiments, the preparation device further includes a curing agent additive 100, and the mixing tank B70 is also provided with a curing agent inlet 74. The outlet of the curing agent additive 100 is connected to the curing agent inlet 74 of the mixing tank B70. The curing agent is a composite curing material containing at least one of sulfate, phosphate, and silicate. Curing agent is added to the mixing tank B70 through the curing agent inlet 74 and the curing agent additive 100. The curing agent is used to fix the free alkali and heavy metals in the red mud slurry formed by the red mud material, thereby reducing the harm of harmful components in the final filling slurry to the underground environment and enabling the resource utilization and harmless treatment of the red mud material. The curing agent is a composite curing material containing at least one of sulfate, phosphate and silicate. Through the physical encapsulation and chemical reaction of the curing agent, it is fully stirred together with the cementing material in the mixing tank B70 to effectively fix the free alkali, fluoride and heavy metal ions and other harmful components in the red mud slurry.

[0027] The process of preparing filling slurry using red mud consumes a large amount of water, and the overflow water generated by the thickener 50 also needs to be treated to render it harmless. This increases the workload of the filling slurry preparation process and leads to water waste. In some embodiments, the preparation device further includes a water storage tank A110, which has an inlet 111 and an outlet 112. The inlet 111 of the water storage tank A110 is connected to the overflow outlet of the thickener 50. The outlet 112 of the thickener 50 is connected to the preparation water inlet A22 and the preparation water inlet B80, storing the overflow water of the thickener 50 in the storage tank A110. During the preparation of filling slurry in the mixing tank A20 and the mixing tank B70, when preparation water is needed, the overflow water stored in the storage tank A110 is preferentially used for the preparation of filling slurry, which can save water resources and reduce the harmless treatment process steps of the overflow wastewater of the thickener 50, thereby improving the filling slurry preparation efficiency.

[0028] In some embodiments, the preparation apparatus further includes a controller, a detection component A120, and a preparation water pump A. The controller is electrically connected to the detection component A120, the feeder 10, and the preparation water pump A. The detection component A120 is located between the outlet of the slurry pump A40 and the red mud slurry inlet A51 of the thickener 50, and is used to detect the flow rate and concentration of the red mud slurry output from the outlet of the slurry pump A40. The controller adjusts the feeder 10 and the preparation water pump A based on the detection data from the detection component A120. Input quantity: The detection component A120, located on the conveying pipeline between the outlet of the slurry pump A40 and the red mud slurry inlet A51 of the thickener 50, detects in real time the flow rate and concentration of the red mud slurry output from the outlet of the slurry pump A40 after being stirred by the mixing tank A20. The flow rate and concentration data detected by the detection component A120 are transmitted to the controller. The controller adjusts the input quantity of the feeder 10 and the preparation water pump A based on the flow rate and concentration data from the detection component A120 to ensure that the concentration of the red mud slurry entering the thickener 50 meets the preset requirements.

[0029] In some embodiments, the feeder 10 is a twin-screw feeder. The rotation speed of the feeder 10 can be controlled by a controller to accurately control the amount of red mud material fed into the mixing tank A20 according to the ratio of red mud material required for preparing the filling slurry.

[0030] In some embodiments, the detection component A120 includes a flow meter A121 and a concentration meter A122, which respectively detect the flow rate and concentration of the red mud slurry output from the outlet of the slurry pump A40, and transmit the detected flow rate and concentration data to the controller, which adjusts the input of the feeder 10 and the preparation water pump A according to the flow rate and concentration data of the detection component A120.

[0031] In some embodiments, the flow meter is an electromagnetic flow meter, which uses the principle of electromagnetic induction to detect the flow rate of the slurry. The measurement results are not affected by changes in physical parameters such as slurry pressure, temperature, density and viscosity. It responds quickly, can reflect changes in flow rate in real time, and ensures measurement accuracy.

[0032] In some embodiments, the preparation apparatus further includes a detection component B130 and a preparation water pump B. The controller is electrically connected to the detection component B130, the thickener 50, and the preparation water pump B. The detection component B130 is located between the outlet of the slurry pump B60 and the red mud slurry inlet B71 of the mixing tank B70, and is used to detect the flow rate and concentration of the red mud underflow output from the outlet of the slurry pump B60. The controller adjusts the input of the preparation water pump B based on the detection data of the detection component B130. By using the detection component B130 located between the outlet of the slurry pump B60 and the red mud slurry inlet B71 of the mixing tank B70 to detect the flow rate and concentration data of the red mud underflow output from the outlet of the slurry pump B60, the controller controls and adjusts the input of the preparation water pump B based on the flow rate and concentration data of the detection component B130 to ensure that the concentration of the red mud slurry entering the mixing tank B70 meets the preset requirements.

[0033] In some embodiments, the detection component B130 includes a flow meter B131 and a concentration meter B132, which respectively detect the flow rate and concentration of the red mud slurry underflow output from the outlet of the slurry pump B60, and transmit the detected flow rate and concentration data to the controller; the controller adjusts the pumping rate of the preparation water pump B, the flocculant addition amount of the flocculant additive 90, the addition amount of the solidifying agent additive 100, and the power of the slurry pump A40 according to the flow rate and concentration data of the detection component B130.

[0034] In some embodiments, the preparation apparatus further includes a detection and adjustment component C140, which is disposed between the outlet 112 of the water storage tank A110 and the preparation water inlet B80, and is electrically connected to the controller. The detection and adjustment component C140 is used to detect the flow rate data of the water delivered from the outlet 112 of the water storage tank A110 to the preparation water inlet B80, and transmit it to the controller. The controller can also control the detection and adjustment component C140 to adjust the flow rate output from the water storage tank A110 to the preparation water inlet B80.

[0035] In some embodiments, the detection and regulation component C140 includes a flow meter C141 and an electric regulating valve A142, both of which are electrically connected to the controller. The flow meter C141 detects the flow rate data of water delivered from the outlet 112 of the water storage tank A110 to the preparation water inlet B80 and transmits it to the controller. The controller controls the opening degree of the electric regulating valve A142, thereby controlling the detection and regulation component C140 to regulate the flow rate output from the water storage tank A110 to the preparation water inlet B80.

[0036] In some embodiments, the preparation apparatus further includes a dilution water pump; the thickener 50 is also provided with a dilution water inlet, and the dilution water pump is connected to the dilution water inlet of the thickener 50; the controller is electrically connected to the dilution water pump; the controller adjusts the input of the dilution water pump according to the detection data of the detection component A120; the controller can combine the concentration and flow rate of the red mud slurry output from the mixing tank A20 detected by the detection component A120 and the required concentration of the red mud slurry before thickening in the thickener 50, calculate the amount of dilution water input by the dilution water pump into the thickener 50, and further accurately control the amount of dilution water input by the dilution water pump into the thickener 50, so that the red mud slurry input from the mixing tank A20 to the thickener 50 is diluted to a suitable concentration before thickening in the thickener 50.

[0037] In some embodiments, the red mud slurry with a concentration of 40-70% input by the slurry pump A40 is diluted and adjusted to an optimal dilution concentration of 10-20% in the thickener 50, and flocculant is added to the thickener 50 so that the flocculant can fully contact the red mud particles in the red mud slurry in the thickener 50, promote the rapid settling of the red mud particles, and improve the treatment efficiency of the thickener 50 in settling the red mud slurry.

[0038] In some embodiments, the controller is electrically connected to the detection component A120, detection component B130, detection adjustment component C140, feeder 10, preparation water pump A, slurry pump A40, dilution water pump, flocculant additive 90, curing agent additive 100, slurry pump B60, preparation water pump B, and cementitious material additive. The controller dynamically optimizes and controls the rotational speed of feeder 10, the pumping flow rate of preparation water pump A, the pumping flow rate of slurry pump A40, the pumping flow rate of dilution water pump, the addition rate of flocculant additive 90, the addition rate of curing agent additive 100, the pumping flow rate of slurry pump B60, the pumping flow rate of preparation water pump B, and the addition rate of cementitious material additive through a preset algorithm based on the real-time data detected by detection components A120 and B130.

[0039] In some embodiments, the dilution degree of the red mud material in the mixing tank A20 ranges from 20% to 40%. Specifically, if the concentration of the red mud material input into the mixing tank A20 is 80% and the dilution degree is 20%, the concentration of the diluted red mud slurry is 60%; if the concentration of the red mud material input into the mixing tank A20 is 80% and the dilution degree is 30%, the concentration of the diluted red mud slurry is 50%; if the concentration of the red mud material input into the mixing tank A20 is 80% and the dilution degree is 35%, the concentration of the diluted red mud slurry is 45%; if the concentration of the red mud material input into the mixing tank A20 is 80% and the dilution degree is 40%, the concentration of the diluted red mud slurry is 40%. That is, when the concentration of the red mud material input into the mixing tank A20 is 80%,... With the red mud material diluted to a concentration range of 20-40%, the final red mud slurry concentration ranges from 40-60%. If the concentration meter A122 detects that the concentration of the red mud slurry output from the mixing tank A20 is higher than 60%, the speed of the feeder 10 is reduced and / or the pumping flow rate of the water pump connected to the preparation water inlet A22 is increased according to a preset algorithm to dilute the red mud material in the mixing tank A20. If the concentration meter A122 detects that the concentration of the red mud slurry output from the mixing tank A20 is lower than 40%, the speed of the feeder 10 is increased according to a preset algorithm to increase the amount of red mud material entering the mixing tank A20 and / or the pumping flow rate of the water pump connected to the preparation water inlet A22 is reduced to increase the concentration of the red mud material in the mixing tank A20, ensuring that the concentration of the red mud slurry output from the mixing tank A20 remains within the target range.

[0040] If the concentration of the red mud material input into mixing tank A20 is 90% and the dilution degree of the red mud material is 20%, then the concentration of the red mud slurry obtained after dilution is 70%; if the concentration of the red mud material input into mixing tank A20 is 90% and the dilution degree of the red mud material is 30%, then the concentration of the red mud slurry obtained after dilution is 60%; if the concentration of the red mud material input into mixing tank A20 is 90% and the dilution degree of the red mud material is 40%, then the concentration of the red mud slurry obtained after dilution is 50%. That is, when the concentration of the red mud material input into mixing tank A20 is 90%, and the dilution degree of the red mud material is in the range of 20~40%, the final concentration range of the red mud slurry obtained is 50~70%.

[0041] In some embodiments, both the mixing tank A20 and the mixing tank B70 are equipped with a mixer to ensure that the input materials are fully mixed in the mixing tank A20 and the mixing tank B70, thereby ensuring uniform mixing of the slurry.

[0042] Example 2 See Figure 2This application provides a method for preparing red mud-based filling slurry, comprising: S100. The red mud material is fed into the mixing tank A, and the preparation water A is added into the mixing tank A for dilution and stirring to obtain red mud slurry of concentration A. S101. The red mud slurry of concentration A is pumped to a thickener by slurry pump A, and the red mud slurry of concentration A is thickened and settled in the thickener to form red mud slurry of concentration B. S102. The red mud slurry of concentration B in the thickener is pumped to the mixing tank B by slurry pump B. S103. Input the cementitious material into the mixing tank B, and input the preparation water B into the mixing tank B, while stirring, to obtain the filling slurry.

[0043] In this embodiment, red mud material and preparation water A are input into mixing tank A. The red mud material and preparation water A are diluted and stirred in mixing tank A to make the red mud material into a red mud slurry of suitable concentration, ensuring the fluidity of the red mud slurry and facilitating its transport to the thickener via slurry pump A and pipelines. Diluting the red mud material in mixing tank A with preparation water A shortens the processing time of the red mud slurry in the thickener, improving the efficiency of the thickener. The red mud slurry of concentration A is pumped to the thickener via slurry pump A for thickening and settling to obtain red mud slurry of concentration B, which is easier to transport to mixing tank B and facilitates stirring in mixing tank B. A filling slurry that is easy to solidify is formed; the cementing material and preparation water B are transported to the mixing tank B, and the cementing material and preparation water B are stirred with red mud slurry of concentration B in the mixing tank B to obtain the filling slurry; then the red mud slurry obtained in the mixing tank B is transported to the filling area through pipeline by the filling industrial pump to complete the filling operation; it can be understood that the above description of preparation water A and preparation water B is to distinguish that the preparation water input into the mixing tank A and the mixing tank B does not mean that the two are different water sources. Under the premise that the preparation water A and preparation water B can meet the water source quality requirements for preparing the filling slurry, the preparation water A and preparation water B can be the same water source or different water sources.

[0044] In some embodiments, the thickening and settling process of red mud slurry of concentration A in the thickener further includes: diluting the red mud slurry of concentration A in the thickener until a red mud slurry of concentration C is obtained; adding flocculant to the thickener while obtaining the red mud slurry of concentration C; further diluting the red mud slurry of concentration A to red mud slurry of concentration C in the thickener is beneficial for the flocculant and red mud slurry to undergo a flocculation reaction in the thickener, thereby promoting the flocculation and settling efficiency of the red mud slurry. Therefore, further diluting the red mud slurry to concentration C in the thickener and adding flocculant to the thickener while obtaining the red mud slurry of concentration C.

[0045] In some embodiments, the preparation method further includes: real-time detection of whether the concentration A of the red mud slurry output by the slurry pump A meets the concentration requirement A; if it does not meet the concentration requirement A, adjusting the amount of red mud material and / or preparation water A input into the mixing tank A; real-time detection of whether the concentration B of the red mud slurry output by the slurry pump B meets the concentration requirement B; if it does not meet the concentration requirement B, adjusting the amount of cementing material and / or preparation water B input into the mixing tank B; diluting the red mud material to a concentration A red mud slurry in the mixing tank A is beneficial for the transport of the red mud slurry and improves the processing efficiency of the thickener for thickening the red mud slurry, therefore, detecting whether the concentration A of the red mud slurry output by the slurry pump A meets the concentration requirement A is necessary. If the concentration requirement A is not met, the amount of red mud material and / or preparation water A input to the mixing tank A is adjusted so that the red mud slurry output after mixing in the mixing tank A is red mud slurry of concentration A. Thickening the red mud slurry to concentration B in the thickener facilitates its transport to the mixing tank B for mixing and the formation of easily solidified filling slurry, which is beneficial to improving the efficiency of preparing red mud material into filling slurry. Therefore, it is necessary to check whether the concentration B of the red mud slurry output by the slurry pump B meets the concentration requirement B. If it does not meet the concentration requirement B, the amount of cementitious material and / or preparation water B input to the mixing tank B is adjusted so as to ensure that the filling slurry formed after mixing in the mixing tank B meets the quality requirements of filling slurry.

[0046] In some embodiments, the mass concentration range of the red mud slurry of concentration A is 40-70%; the mass concentration range of the red mud slurry of concentration B is 58-62%; the concentration requirement A is a requirement that the mass concentration range of the red mud slurry of concentration A is 40-70%, and the concentration requirement B is a requirement that the mass concentration range of the red mud slurry of concentration B is 58-62%.

[0047] In some embodiments, the mass concentration range of the concentration C red mud slurry is 10-20%.

[0048] 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 a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element. The terms “center,” “longitudinal,” “lateral,” “length,” “width,” “thickness,” “upper,” “lower,” “front,” “rear,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” “outer,” “clockwise,” “counterclockwise,” “axial,” “radial,” and “circumferential” indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to 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 the embodiments of this application.

[0049] The above description is merely a specific implementation of the embodiments of this application, but the protection scope of the embodiments of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the embodiments of this application should be included within the protection scope of the embodiments of this application. Therefore, the protection scope of the embodiments of this application should be determined by the protection scope of the claims.

Claims

1. A red mud-based filling slurry preparation device, characterized in that, include: The feeder is provided with a feed inlet and a discharge outlet; A mixing tank A is provided with a red mud inlet, a preparation water inlet A, and a red mud slurry outlet; the outlet of the feeder is connected to the red mud inlet of the mixing tank A; in the mixing tank A, the red mud material entering through the red mud inlet of the mixing tank A and the preparation water entering through the preparation water inlet A are stirred and mixed to initially dilute the red mud material; Slurry pump A, the red mud slurry outlet of the mixing tank A is connected to the inlet of the slurry pump A; A thickener is provided with a red mud slurry inlet and an underflow outlet; the outlet of the slurry pump A is connected to the red mud slurry inlet of the thickener. Slurry pump B, the underflow outlet of the thickener is connected to the inlet of slurry pump B; A mixing tank B is provided with a red mud slurry inlet, a cementitious material inlet, and a filling material slurry outlet. The outlet of the slurry pump B is connected to the red mud slurry inlet of the mixing tank B. The water inlet B is connected to the red mud slurry inlet of the mixing tank B.

2. The red mud-based filling slurry preparation apparatus according to claim 1, characterized in that, It also includes a flocculant additive, the thickener is provided with a flocculant inlet, the flocculant additive is connected to the flocculant inlet of the thickener, and the flocculant is a polyacrylamide-based polymeric flocculant.

3. The red mud-based filling slurry preparation apparatus according to claim 1, characterized in that, It also includes a curing agent additive, and the mixing tank B is also provided with a curing agent inlet. The outlet of the curing agent additive is connected to the curing agent inlet of the mixing tank B. The curing agent is a composite curing material containing at least one of sulfate, phosphate, and silicate.

4. The red mud-based filling slurry preparation apparatus according to claim 1, characterized in that, It also includes a water storage tank A, which has an inlet and an outlet; the inlet of the water storage tank A is connected to the overflow outlet of the thickener, and the outlet of the water storage tank A is connected to the preparation water inlet A and the preparation water inlet B.

5. The red mud-based filling slurry preparation apparatus according to any one of claims 1-4, characterized in that, It also includes a controller, a detection component A, and a preparation water pump A. The controller is electrically connected to the detection component A, the feeder, and the preparation water pump A. The detection component A is located between the outlet of the slurry pump A and the red mud slurry inlet of the thickener, and is used to detect the flow rate and concentration of the red mud slurry output from the outlet of the slurry pump A. The controller adjusts the input of the feeder and the preparation water pump A based on the detection data of the detection component A.

6. The red mud-based filling slurry preparation apparatus according to claim 5, characterized in that, It also includes a detection component B and a preparation water pump B. The controller is electrically connected to the detection component B, the thickener, and the preparation water pump B. The detection component B is located between the outlet of the slurry pump B and the red mud slurry inlet of the mixing tank B, and is used to detect the flow rate and concentration of the red mud underflow output from the outlet of the slurry pump B. The controller adjusts the input of the preparation water pump B according to the detection data of the detection component B.

7. The red mud-based filling slurry preparation apparatus according to claim 5, characterized in that, It also includes a dilution water pump; the thickener is further provided with a dilution water inlet, and the dilution water pump is connected to the dilution water inlet of the thickener; the controller is electrically connected to the dilution water pump, and the controller adjusts the input of the dilution water pump according to the detection data of the detection component A.

8. A method for preparing red mud-based filling slurry, characterized in that, include: Red mud material is fed into mixing tank A, and preparation water A is added to mixing tank A for dilution and stirring to obtain red mud slurry of concentration A. The red mud slurry of concentration A is pumped to a thickener by slurry pump A, and the red mud slurry of concentration A is thickened and settled in the thickener to form red mud slurry of concentration B. The red mud slurry of concentration B in the thickener is pumped to the mixing tank B by slurry pump B. A cementitious material is introduced into the mixing tank B, and preparation water B is introduced into the mixing tank B while stirring is performed to obtain a filling slurry.

9. The method for preparing red mud-based filling slurry according to claim 8, characterized in that, The thickening and settling process of red mud slurry of concentration A in the thickener also includes: The red mud slurry of concentration A is diluted in the thickener until a red mud slurry of concentration C is obtained; A flocculant is added to the thickener while obtaining the red mud slurry of concentration C.

10. The method for preparing red mud-based filling slurry according to claim 8, characterized in that, Also includes: Real-time monitoring of whether the concentration A of the red mud slurry output by the slurry pump A meets the concentration requirement A; If the concentration requirement A is not met, adjust the amount of red mud material and / or preparation water A input into the stirring tank A; Real-time monitoring of whether the concentration of the red mud slurry output by the slurry pump B meets the concentration requirement B; If the concentration requirement B is not met, adjust the amount of the gelling material and / or preparation water B input into the mixing tank B.

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