Control method of ore grinding unit

Abstract

The invention discloses a control method of an ore grinding unit. The method comprises the steps that the particle size ratio of target mineral aggregate output by the cyclone set from the second outlet is obtained, the mineral aggregate particle size of the target mineral aggregate is smaller than or equal to a preset particle size threshold value, and the particle size ratio is the ratio of the content of the target mineral aggregate to the content of total mineral aggregate output by the second outlet; if the particle size ratio is not within the preset particle size ratio range, the water adding rate entering the first slurry pumping pool is adjusted till the particle size ratio is within the particle size ratio range, and the water adding rate and the particle size ratio are in positive correlation. According to the invention, the classification precision of the cyclone group can be improved.

Description

Technical Field

[0001] The present application belongs to the technical field of ore grinding, and in particular to a control method for an ore grinding unit. Background Art

[0002] In the grinding process, the cyclone is a commonly used classification equipment. Its working principle is to classify the ore. The coarse particles are separated and returned to the grinder for further grinding. This can effectively prevent the overly coarse particles from mixing into the subsequent selection process, thereby ensuring that the product particle size is more uniform and stable.

[0003] During the grinding process, the properties of the ore often change. For example, changes in ore hardness, mineral composition, etc., or unstable operation of the previous process, etc., will make it difficult to keep the feed situation constant, which brings challenges to the accurate control of the classification accuracy of the cyclone. Summary of the invention

[0004] The embodiments of the present application provide a control method for a grinding mill group, thereby being able to improve the classification accuracy of a cyclone group at least to a certain extent.

[0005] Other features and advantages of the present application will become apparent from the following detailed description, or may be learned in part by the practice of the present application.

[0006] According to a first aspect of an embodiment of the present application, a control method for a grinding mill group is provided, wherein the grinding mill group includes a first process equipment, wherein the first process equipment includes: a grinding mill, a first pump sump and a cyclone group, wherein the grinding mill is provided with a return port and a discharge port, wherein the first pump sump is connected to the return port, wherein the first pump sump is connected to the cyclone group, wherein the cyclone group is provided with a first outlet and a second outlet, wherein the first outlet is connected to the return port, wherein the particle size of the ore outputted from the second outlet is smaller than the particle size of the ore outputted from the first outlet, wherein the method includes:

[0007] Obtaining a particle size ratio of a target mineral material outputted from the second outlet of the cyclone group, wherein the mineral material particle size of the target mineral material is less than or equal to a preset particle size threshold, and the particle size ratio is a ratio between the content of the target mineral material and the content of the total mineral material outputted from the second outlet;

[0008] If the particle size ratio is not within the preset particle size ratio range, the water addition rate entering the first pump slurry pool is adjusted until the particle size ratio is within the particle size ratio range, wherein the water addition rate is positively correlated with the particle size ratio.

[0009] Optionally, the first pump tank includes a water adding valve, and the water adding rate entering the first pump tank is adjusted until the particle size ratio is within the particle size ratio range, comprising:

[0010] The opening of the water adding valve is adjusted according to a preset first step length, and the particle size ratio is reacquired after each adjustment of the opening until the particle size ratio is within the particle size ratio range, and the adjustment of the opening of the water adding valve is stopped, wherein the opening of the water adding valve is positively correlated with the particle size ratio.

[0011] Optionally, the first pump slurry tank is provided with a first motor, and after the particle size ratio is within the particle size ratio range, the method further comprises:

[0012] Obtaining the current liquid level of the first pump slurry pool;

[0013] If the current liquid level is not within the preset liquid level range, the frequency of the first motor is adjusted until the current liquid level is within the liquid level range, wherein the frequency of the first motor is negatively correlated with the current liquid level.

[0014] Optionally, the adjusting the frequency of the first motor until the current liquid level is within the liquid level range includes:

[0015] The frequency of the first motor is adjusted according to a preset second step length, and the current liquid level is reacquired after each adjustment of the frequency until the current liquid level is within the liquid level range, and the frequency of the first motor is stopped from being adjusted.

[0016] Optionally, the cyclone group includes a plurality of cyclones, and after the step of waiting until the current liquid level is within the liquid level range, the method further includes:

[0017] Obtain the feed pressure of the cyclone;

[0018] If the feed pressure is not within a preset pressure range, the opening and closing state of at least one of the cyclones is adjusted, wherein the feed pressure is negatively correlated with the number of cyclones in the open state, or the feed pressure is positively correlated with the number of cyclones in the closed state.

[0019] Optionally, adjusting the opening and closing state of at least one of the cyclones comprises:

[0020] If the feed pressure is less than the pressure range, the cyclones are closed one by one, and the feed pressure is re-acquired after each cyclone is closed, until the feed pressure is within the pressure range, and the closing of the remaining cyclones is stopped;

[0021] If the feed pressure is greater than the pressure range, the cyclones are opened one by one, and the feed pressure is re-acquired after each opening of the cyclone until the feed pressure is within the pressure range, and the opening of the remaining cyclones is stopped.

[0022] Optionally, the first pumping pool is provided with a pumping pipeline, the pumping pipeline is connected to the cyclone group, and in the process of adjusting the water addition rate entering the first pumping pool, the method further comprises:

[0023] Detecting the ore concentration fed from the first pump slurry pool to the cyclone group through the pump slurry pipeline;

[0024] If the feed concentration exceeds a preset feed concentration range, the water addition rate is stopped from being adjusted and an alarm is issued.

[0025] Optionally, after the step of adjusting the particle size ratio until the particle size ratio is within the particle size ratio range, the method further comprises:

[0026] Obtaining the current liquid level of the first pump slurry pool;

[0027] If the current liquid level is not within the preset liquid level range, the feed rate entering the first pump pool is adjusted until the current liquid level is within the liquid level range, wherein the feed rate is positively correlated with the current liquid level.

[0028] Optionally, the grinding mill group further includes a second process equipment. In the grinding process flow, the second process equipment operates in the next process of the first process equipment. After the particle size ratio is within the particle size ratio range, the method further includes:

[0029] obtaining a circulating load of the second process equipment;

[0030] If the circulating load is less than a preset load range, controlling the first process equipment to operate according to the lower limit value of the particle size ratio range;

[0031] If the circulating load is greater than the load range, the first process equipment is controlled to operate according to the upper limit value of the particle size ratio range.

[0032] Optionally, the second process equipment includes a second pump slurry tank and a second motor, and obtaining the circulation load of the second process equipment includes:

[0033] The liquid level of the second pump slurry pool or the current of the second motor is obtained, wherein the liquid level of the second pump slurry pool is positively correlated with the circulating load, and the current of the second motor is positively correlated with the circulating load.

[0034] According to a second aspect of an embodiment of the present application, an electronic device is provided, comprising one or more processors and one or more memories, wherein at least one program code is stored in the one or more memories, and the at least one program code is loaded and executed by the one or more processors to implement the operations performed by any of the methods described in the first aspect.

[0035] According to a third aspect of an embodiment of the present application, a computer-readable storage medium is provided, in which at least one computer program instruction is stored. The at least one computer program instruction is loaded and executed by a processor to implement the operations performed by any method described in the first aspect.

[0036] One or more technical solutions provided by the embodiments of the present invention achieve at least the following technical effects or advantages:

[0037] The present application obtains the particle size ratio of the target mineral material output from the second outlet of the cyclone group, the mineral material particle size of the target mineral material is less than or equal to the preset particle size threshold, and the particle size ratio is the ratio between the content of the target mineral material and the content of the total mineral material output from the second outlet; if the particle size ratio is not within the preset particle size ratio range, the water addition rate entering the first pump slurry pool is adjusted until the particle size ratio is within the particle size ratio range, wherein the water addition rate is positively correlated with the particle size ratio. Therefore, the embodiment of the present application adjusts the water addition rate of the first pump slurry pool so that the particle size ratio of the mineral material output from the cyclone group is always within the particle size ratio range, thereby improving the classification accuracy of the cyclone group.

[0038] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The drawings herein are incorporated into the specification and constitute a part of the specification, showing embodiments consistent with the present application, and together with the specification, are used to explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0040] Figure 1 A schematic structural diagram of a grinding mill set according to an embodiment of the present application is shown;

[0041] Figure 2 A flow chart showing a method for controlling a grinding mill according to an embodiment of the present application is shown;

[0042] Figure 3 A schematic diagram of the structure of a computer system suitable for implementing an electronic device of an embodiment of the present application is shown. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0044] In addition, described feature, structure or characteristic can be combined in one or more embodiments in any suitable manner. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present application. However, those skilled in the art will appreciate that the technical scheme of the present application can be put into practice without one or more of the specific details, or other methods, components, devices, steps, etc. can be adopted. In other cases, known methods, devices, realizations or operations are not shown or described in detail to avoid blurring the various aspects of the application.

[0045] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically separate entities. That is, these functional entities may be implemented in software form, or in one or more hardware modules or integrated circuits, or in different models and / or processor devices and / or microcontroller devices.

[0046] The flowcharts shown in the accompanying drawings are only exemplary and do not necessarily include all the contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps can be decomposed, and some operations / steps can be combined or partially combined, so the actual execution order may change according to actual conditions.

[0047] It should also be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the objects used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those shown or described.

[0048] At present, mineral processing manufacturers usually adopt closed-circuit grinding process for many reasons, such as improving the quality of grinding products to meet the requirements of subsequent separation operations for material particle size, improving grinding efficiency to reduce energy consumption and production costs, stabilizing the production process to ensure the orderly connection of various links, and adapting to different ore properties and product requirements. In the closed-circuit grinding process system, the cyclone is a commonly used classification equipment. Its working principle is to classify the grinding products, and the coarse particles are separated and returned to the mill for re-grinding. This can effectively prevent over-coarse particles from mixing into the subsequent separation process, thereby ensuring that the product particle size is more uniform and stable. At the same time, the timely separation of qualified fine-grained materials with the help of the cyclone can significantly reduce the phenomenon of over-crushing, allowing the mill to focus its main energy on the grinding of coarse particles, thereby effectively improving the grinding efficiency.

[0049] However, the cyclone faces many difficult problems in the actual control process. On the one hand, its classification accuracy is affected by the interaction of multiple factors such as feed pressure, concentration and particle size, which is extremely complicated. Fluctuations in feed pressure will cause significant changes in classification particle size. In actual production scenarios, due to the constant changes in ore properties, such as changes in ore hardness, mineral composition, etc., or the unstable operation of the previous process, such as fluctuations in feed amount, it is difficult to keep the feed situation constant, which poses a huge challenge to the precise control of the classification accuracy of the cyclone. On the other hand, with the continuous expansion of the scale of mineral processing plants, equipment has shown a trend of large-scale development, and cyclones have also been correspondingly used in the form of cyclone groups to match this large-scale demand. However, at present, there is a lack of mature and complete control standards for the number of cyclone groups in operation, and manual intervention and adjustment are often required. This not only increases the labor intensity and workload of manual operation, but also due to the limitations of manual judgment and operation, it is difficult to accurately and timely optimize the number of cyclone groups to be started according to the actual production situation, which is not conducive to the continuous and stable performance of the grinding and classification efficiency, and easily leads to increased fluctuations and unstable factors in the production process, which in turn has an adverse impact on the production efficiency and product quality of the entire ore dressing plant.

[0050] In view of this, an embodiment of the present application provides a control method for a grinding mill, which can improve the classification accuracy of the grinding mill at least to a certain extent. The method is described in detail below with reference to specific drawings.

[0051] Figure 1 A schematic structural diagram of a grinding mill set according to an embodiment of the present application is shown; Figure 2 A flow chart of a method for controlling a grinding mill according to an embodiment of the present application is shown.

[0052] like Figure 1As shown, the grinding mill 1 group includes a first process equipment, and the first process equipment includes: a grinding mill 1, a first pump slurry pool 11 and a cyclone group. The grinding mill 1 is provided with a return port and a discharge port. The first pump slurry pool 11 is connected to the return port. The first pump slurry pool 11 is connected to the cyclone group. The cyclone group is provided with a first outlet and a second outlet. The first outlet is connected to the return port. The particle size of the ore output by the second outlet is smaller than the particle size of the ore output by the first outlet.

[0053] It should be noted that the working principle of the first process equipment can be: the pump 3 slurry pool transports the slurry to the cyclone group, the cyclone group classifies the slurry, and the ore with smaller particle size that meets the selection standard of this process section is output through the second outlet, for example, entering the next process; the slurry with too large particle size is transported to the return port through the first outlet, enters the grinding machine 1 for further grinding, and the ground slurry enters the first pump slurry pool 11, and the above process is repeated until the particle size of the slurry output from the current process section meets the standard.

[0054] In some embodiments, the first pump pool 11 is provided with a flow meter 9 and a water adding valve 10, the flow meter 9 is used to detect the flow of water entering the first pump pool 11, and the water adding valve 10 is used to control the amount of water entering the pump 3 pool.

[0055] In some embodiments, the first pump slurry pool 11 includes a motor, a pump 3 and a pump 3 slurry pipeline, the pump 3 slurry pipeline is connected to the cyclone group, the motor is configured to drive the pump 3 to work, and the pump 3 transfers the slurry in the first pump slurry pool 11 into the cyclone group through the pump 3 slurry pipeline.

[0056] In some embodiments, the first pumping tank 11 is provided with a liquid level meter 2 , and the liquid level meter 2 is configured to detect the current liquid level of the slurry in the first pumping tank 11 .

[0057] In some embodiments, the cyclone group includes a plurality of cyclones, each of which is connected to the slurry pipeline via a branch pipe, and the branch pipe is provided with a switch valve 4, and the switch valve 4 is used to control the connection or closing of the branch pipe.

[0058] In some embodiments, the cyclone group is provided with a pressure sensor 5 configured to detect the feed pressure on the cyclone group.

[0059] In some embodiments, the cyclone group is provided with a concentration meter 6 configured to detect the concentration of the slurry in the cyclone group.

[0060] In some embodiments, the second outlet is provided with a pipeline sampler 7 and a particle size analyzer 8, the pipeline sampler 7 is used to sample the mineral material output from the second outlet, and the particle size analyzer 8 is used to detect the particle size ratio of the sampled mineral material.

[0061] like Figure 2 As shown, according to the first aspect of the embodiment of the present application, a control method for a grinding mill group is provided, and the method can be executed on a control device at a grinding process site, such as an industrial computer, and the method includes but is not limited to:

[0062] Step S1. Obtaining a particle size ratio of a target ore outputted from the second outlet of the cyclone group, wherein the particle size of the target ore is less than or equal to a preset particle size threshold, and the particle size ratio is a ratio between the content of the target ore and the content of the total ore outputted from the second outlet;

[0063] For example, the particle size ratio of the target mineral material output from the second outlet is detected by the particle size analyzer.

[0064] Step S2. If the particle size ratio is not within the preset particle size ratio range, the water addition rate entering the first pump slurry pool is adjusted until the particle size ratio is within the particle size ratio range, wherein the water addition rate is positively correlated with the particle size ratio.

[0065] It can be understood that if the particle size ratio is not within the preset particle size ratio range, it means that the ratio of the target ore material less than or equal to the preset particle size threshold (for example, 3 mm) is too large or too small. If it is too large, the particle size of the ore slurry output from the second outlet to the next process is too fine, which is not conducive to the selection of the next process. If it is too small, the particle size of the ore slurry output from the second outlet to the next process is too coarse, and the grinding efficiency is low.

[0066] It should be noted that the positive correlation between the water addition rate and the particle size ratio means that the greater the water addition rate, the greater the particle size ratio, and the smaller the water addition rate, the smaller the particle size ratio. It can be understood that when the slurry concentration and the feed pressure are within a certain range, the greater the water addition rate, the lower the slurry concentration in the first pump slurry pool, so that the classification effect of the cyclone group is better, the content of the ore below the preset particle size threshold will increase, and the particle size ratio will increase.

[0067] In some embodiments, the first pump tank includes a water adding valve, and the water adding rate entering the first pump tank is adjusted until the particle size ratio is within the particle size ratio range, including:

[0068] The opening of the water adding valve is adjusted according to a preset first step length, and the particle size ratio is reacquired after each adjustment of the opening until the particle size ratio is within the particle size ratio range, and the adjustment of the opening of the water adding valve is stopped, wherein the opening of the water adding valve is positively correlated with the particle size ratio.

[0069] For example, the preset particle size ratio range is Gmin (lower limit of particle size ratio) to Gmax (upper limit of particle size ratio), the particle size detection time interval T, T can be 1 minute, 2 minutes, 5 minutes, 10 minutes, etc., the water filling valve opening adjustment range ΔZ, ΔZ can be 2%, 5%, 10%, etc. The above values ​​can be adjusted in the system and are not limited here.

[0070] During the grinding process, the particle size analyzer samples the overflow particle size ratio of the cyclone group at the detection time interval T, and the sampling result is set as the particle size ratio G.

[0071] If Gmin<G<Gmax, the existing control parameters are maintained unchanged.

[0072] If G≥Gmax, it means that the overflow of the cyclone group is too fine, which is not conducive to the efficiency of the grinding and classification process. It is necessary to increase the cyclone feed concentration to make the overflow particle size coarser and improve the passing capacity of the grinding and classification process. Reduce the opening of the water adding valve according to the adjustment range ΔZ, reduce the water adding rate of the first pump slurry pool, thereby increasing the cyclone feed concentration D, and then reduce the classification effect of the cyclone group, so that the content of the ore below the preset particle size threshold will decrease, thereby reducing the particle size ratio. After the detection time interval T, continue to detect and compare the particle size ratio. If G≥Gmax, continue to adjust according to the above steps until G<Gmax.

[0073] If G≤Gmin, it means that the overflow of the cyclone group is coarse, which is not conducive to the efficiency of the next process. It is necessary to reduce the cyclone feed concentration to make the overflow particle size finer and improve the classification effect of the grinding and classification process. Increase the opening of the water adding valve according to the adjustment range ΔZ, increase the water adding rate of the first pump slurry pool, thereby reducing the cyclone feed concentration D, and then increase the classification effect of the cyclone group, so that the content of the ore below the preset particle size threshold will increase, thereby increasing the particle size ratio. After the detection time interval T, continue to detect and compare the overflow particle size. If G≤Gmin, continue to adjust according to the above steps until G>Gmin.

[0074] In some embodiments, the first pump slurry tank is provided with a first motor, and after the step of waiting until the particle size ratio is within the particle size ratio range, the method further comprises:

[0075] Step S3. Obtaining the current liquid level of the first pump slurry pool;

[0076] For example: the current liquid level of the first pump slurry pool is detected by a liquid level meter.

[0077] Step S4. If the current liquid level is not within the preset liquid level range, the frequency of the first motor is adjusted until the current liquid level is within the liquid level range, wherein the frequency of the first motor is negatively correlated with the current liquid level.

[0078] It is understandable that after adjusting the water addition rate of the first pump slurry tank, the liquid level of the first pump slurry tank will change. In order to prevent the pump tank from being emptied or the ore is full, the motor frequency needs to be adjusted.

[0079] The negative correlation between the frequency of the first motor and the current liquid level means that the smaller the frequency of the first motor is, the larger the current liquid level is, and the larger the frequency of the first motor is, the smaller the current liquid level is.

[0080] In some embodiments, adjusting the frequency of the first motor until the current liquid level is within the liquid level range includes:

[0081] The frequency of the first motor is adjusted according to a preset second step length, and the current liquid level is reacquired after each adjustment of the frequency until the current liquid level is within the liquid level range, and the frequency of the first motor is stopped from being adjusted.

[0082] For example, the preset liquid level range is Llow (liquid level lower limit) to Lhigh (liquid level upper limit), and the frequency adjustment amplitude of the first motor is ΔS, and ΔS can be 5Hz, 10Hz, 15Hz, etc. The above values ​​can be adjusted in the system and are not limited here.

[0083] During the grinding process, the current liquid level L is compared with the liquid level range. If Llow<L<Lhigh, no adjustment is made.

[0084] If L≤Llow, reduce the frequency S of the first motor according to the adjustment amplitude ΔS to reduce the pump delivery capacity, thereby preventing the frequency of the first motor from being too high when the liquid level is too low, resulting in the pump slurry being emptied; after a certain interval, such as 10s, 15s, etc., compare the liquid level L with the liquid level range again until Llow<L<Lmax.

[0085] If L≥Lhigh, increase the frequency S of the first motor according to the adjustment amplitude ΔS to increase the pump delivery capacity, thereby preventing the frequency of the first motor from being too low when the liquid level is too high, resulting in a full tank. After a certain interval, such as 10s, 15s, etc., compare the liquid level L with the liquid level range again until Llow<L<Lmax.

[0086] In some embodiments, the cyclone group includes a plurality of cyclones, and after the step of waiting until the current liquid level is within the liquid level range, the method further includes:

[0087] Step S5. Obtaining the feed pressure of the cyclone;

[0088] For example: Use a pressure sensor to detect the feed pressure of the cyclone.

[0089] It should be noted that each cyclone can be connected to the pump slurry pipeline (main pipe) through a branch pipe. When the configuration parameters of each cyclone are the same, the feed pressure of each cyclone is basically the same. The above-mentioned feed pressure can refer to the remaining pressure after deducting the pressure loss from the main pipe to the branch pipe inlet and the resistance loss of the branch pipe itself from the main pipe pressure.

[0090] Step S6. If the feed pressure is not within the preset pressure range, the opening and closing state of at least one of the cyclones is adjusted, wherein the feed pressure is negatively correlated with the number of cyclones in the open state, or the feed pressure is positively correlated with the number of cyclones in the closed state.

[0091] The negative correlation between the feed pressure and the number of cyclones in the open state means that the more cyclones in the open state, the smaller the feed pressure. In other words, the feed pressure can be reduced by increasing the number of cyclones in the open state.

[0092] The positive correlation between the feed pressure and the number of cyclones in the closed state means that the more cyclones in the closed state, the greater the feed pressure. In other words, the feed pressure can be increased by increasing the number of cyclones in the closed state.

[0093] It is understandable that, after the frequency of the first motor is adjusted so that the liquid level of the first pump slurry pool is within the preset liquid level range, the pressure of the slurry provided by the first pump slurry pool to the cyclone group through the pump slurry pipeline is constant, that is, the pressure in the pump slurry pipeline is constant. Then, under the condition that the pressure of the pump slurry pipeline remains unchanged, the more outlets of the main pipe (that is, the more branches in the open state), the total flow in the main pipe will be distributed at multiple outlets, and the flow will be dispersed, so the pressure at each main pipe outlet will be reduced. Therefore, it is necessary to adjust the open or closed state of the cyclone according to the actual working conditions so that the feed pressure of the cyclone is kept within the preset pressure range.

[0094] In some embodiments, adjusting the opening and closing state of at least one of the cyclones comprises:

[0095] Step S61. If the feed pressure is less than the pressure range, the cyclones are closed one by one, and the feed pressure is re-acquired after each cyclone is closed, until the feed pressure is within the pressure range, and the remaining cyclones are stopped from being closed;

[0096] Step S62: if the feed pressure is greater than the pressure range, the cyclones are opened one by one, and the feed pressure is re-acquired after each opening of the cyclone, until the feed pressure is within the pressure range, and the opening of the remaining cyclones is stopped.

[0097] For example, the feed pressure P of the cyclone group detected by the pressure sensor is compared with the preset pressure range (Plow to Pmax). If Plow<P<Pmax, no adjustment is made.

[0098] If P≤Pmin, close the switch valve of one cyclone at a time, and check the feed pressure again after a certain interval (for example, 2 minutes, 3 minutes, 4 minutes, etc.). If P≤Pmin is still true, continue to close the switch valve of one cyclone until Plow<P<Pmax.

[0099] If P≥Pmax, then open one cyclone switch valve each time, and check the pressure again after a certain period of time (e.g., 2 minutes, 3 minutes, 4 minutes, etc.). If P≥Pmax still, then continue to open one cyclone switch valve until Plow<P<Pmax.

[0100] In some embodiments, the first pumping pool is provided with a pumping pipeline, the pumping pipeline is connected to the cyclone group, and in the process of adjusting the water addition rate entering the first pumping pool, the method further includes:

[0101] Detecting the ore concentration fed from the first pump slurry pool to the cyclone group through the pump slurry pipeline;

[0102] If the feed concentration exceeds a preset feed concentration range, the water addition rate is stopped from being adjusted and an alarm is issued.

[0103] It is understandable that the feed concentration is allowed to be adjusted within the set range, that is, Dmin<D<Dmax. If the concentration value D exceeds the set range after the water addition rate of the first pump slurry tank is adjusted, but the detected particle size ratio G still does not reach the preset particle size ratio range, the water addition rate of the first pump slurry tank will no longer be adjusted, and an alarm may be issued, such as a pop-up alarm window, to remind the operator to check.

[0104] In addition, in order to ensure the stability of the liquid level of the first pump slurry pool and prevent the first pump slurry pool from being emptied or full, the minimum warning liquid level Lmin and the maximum warning liquid level Lmax are preset. If the current liquid level L≥Lmax detected, the supplementary water flow rate is immediately reduced and the pump operation frequency is increased to prevent the pump pool from being full; if the current liquid level L≤Lmin detected, the supplementary water flow rate is immediately increased and the pump operation frequency is reduced to prevent the pump from being emptied. In addition, liquid level warnings can also be performed, such as popping up an alarm window to remind the operator to check.

[0105] In some embodiments, after the step of waiting until the particle size ratio is within the particle size ratio range, the method further comprises:

[0106] Obtaining the current liquid level of the first pump slurry pool;

[0107] If the current liquid level is not within the preset liquid level range, the feed rate entering the first pump pool is adjusted until the current liquid level is within the liquid level range, wherein the feed rate is positively correlated with the current liquid level.

[0108] It is understandable that the first pump slurry pool can be fed by the previous process, such as the sorting process, the belt transportation process or the weighing process to control the feeding amount. For example: when the overflow particle size of the cyclone meets the standard, that is, Gmin<G<Gmax, but the current liquid level L of the first pump slurry pool ≤ the lower limit of the liquid level Llow, the feeding amount of the previous process can be increased according to the set adjustment range. For another example: when the overflow particle size of the cyclone meets the standard, that is, Gmin<G<Gmax, but the current liquid level L of the first pump slurry pool > the upper limit of the liquid level Lmax, the feeding amount of the previous process can be reduced according to the set adjustment range.

[0109] In some embodiments, the grinding mill group further includes a second process equipment. In the grinding process flow, the second process equipment operates in the next process of the first process equipment. After the particle size ratio is within the particle size ratio range, the method further includes:

[0110] Step S71. Obtaining the circulating load of the second process equipment;

[0111] It is understandable that the second process equipment can be a process section equipment for further fine grinding or screening of the ore outputted from the first process equipment. For example, the second process equipment includes a grinding mill, a second pump slurry tank and a screening equipment. The screening equipment receives the ore from the second pump slurry tank for screening, outputs the ore with a larger particle size back to the grinding mill for further grinding, and outputs the ore with a particle size that meets the final particle size requirement.

[0112] Therefore, the circulating load may refer to: the ratio between the content of mineral material returned from the screening equipment in the closed-loop circulation of the second process equipment and the amount of raw ore feed (the content of mineral material output from the first process equipment to the second process equipment).

[0113] In some embodiments, the second process equipment includes a second pump tank and a second motor, and obtaining the circulating load of the second process equipment includes:

[0114] The liquid level of the second pump slurry pool or the current of the second motor is obtained, wherein the liquid level of the second pump slurry pool is positively correlated with the circulating load, and the current of the second motor is positively correlated with the circulating load.

[0115] It can be understood that the smaller the liquid level of the second pump slurry pool, the less slurry the second pump slurry pool provides, and therefore the smaller the circulating load is. Conversely, the larger the liquid level of the second pump slurry pool, the larger the slurry the second pump slurry pool provides, and therefore the larger the circulating load is. In addition, the smaller the current of the second motor, the less slurry the second pump slurry pool provides, and therefore the smaller the circulating load is. Conversely, the larger the current of the second motor, the larger the slurry the second pump slurry pool provides, and therefore the larger the circulating load is.

[0116] Step S72. If the circulating load is less than the preset load range, the first process equipment is controlled to operate according to the lower limit of the particle size ratio range;

[0117] That is to say, when the circulation load of the second process equipment is too small, the overflow particle size G of the cyclone is reduced and controlled according to the lower limit of the particle size Gmin, so as to improve the throughput of the grinding and classification process, put the circulation load on the later process, and at the same time, implement the aforementioned mill feed chain control to increase the feed of the previous process.

[0118] Step S73. If the circulating load is greater than the load range, the first process equipment is controlled to operate according to the upper limit value of the particle size ratio range.

[0119] That is to say, when the circulation load of the second process equipment is too large, the overflow particle size G of the cyclone is increased and controlled according to the particle size upper limit Gmax to improve the grading effect of the grinding and grading process. At the same time, the aforementioned mill feed rate interlocking control is implemented to reduce the feed rate of the previous process.

[0120] It is understandable that the returned mineral content all enters the second pump slurry pool. If the returned mineral content is greater, the liquid level of the second pump slurry pool will be greater. If the first process equipment is not adjusted, in order to prevent the second pump slurry pool from running away, it is necessary to reduce the water replenishment of the second pump slurry pool or increase the motor frequency of the second pump slurry pool. The above adjustment method may cause the screening efficiency of the screening equipment to decrease, which in turn causes the returned mineral content to increase further, resulting in a vicious cycle. Therefore, in the embodiment of the present application, when the circulating load of the second process equipment is not within the load range, the particle size ratio of the mineral output from the first process equipment to the second process equipment is adjusted to keep the circulating load of the second process equipment within the preset load range.

[0121] In some embodiments, a minimum particle size ratio warning value and a maximum particle size ratio warning value are set, the minimum particle size ratio warning value is less than the lower limit of the particle size ratio range, and the highest particle size ratio warning value is greater than the upper limit of the particle size ratio range.

[0122] When the circulation load of the second process equipment is normal, the overflow particle size of the cyclone is controlled according to the preset particle size ratio range. When the circulation load of the second process equipment is too large, the overflow particle size G of the cyclone is increased, and it is controlled in the range from the upper limit of the particle size ratio range to the maximum particle size ratio warning value, so as to improve the grading effect of the grinding and grading process, and at the same time, the aforementioned mill feed chain control is performed to reduce the feed of the previous process. When the circulation load of the second process equipment is too small, the overflow particle size G of the cyclone is reduced, and it is controlled in the range from the lowest particle size ratio warning value to the lower limit of the particle size ratio range, so as to improve the passing capacity of the grinding and grading process, and put the circulation load to the later process, and at the same time, the aforementioned mill feed chain control is performed to increase the feed of the previous process.

[0123] Figure 3 A schematic diagram of the structure of a computer system suitable for implementing an electronic device of an embodiment of the present application is shown.

[0124] According to a second aspect of an embodiment of the present application, an electronic device is provided, comprising one or more processors and one or more memories, wherein at least one program code is stored in the one or more memories, and the at least one program code is loaded and executed by the one or more processors to implement operations performed by any method of the first aspect.

[0125] like Figure 3 As shown, the electronic device 400 is in the form of a general computing device. The components of the electronic device 400 may include but are not limited to: at least one processing unit 410, at least one storage unit 420, and a bus 430 connecting different system components (including the storage unit 420 and the processing unit 410).

[0126] The storage unit stores program codes, which can be executed by the processing unit 410, so that the processing unit 410 executes the steps described in the above “Embodiment Method” section of this specification according to various exemplary implementations of the present application.

[0127] The storage unit 420 may include a readable medium in the form of a volatile storage unit, such as a random access memory unit (RAM) 421 and / or a cache 422 , and may further include a read-only memory unit (ROM) 423 .

[0128] The storage unit 420 may also include a program / utility 424 having a set (at least one) of program modules 425, such program modules 425 including but not limited to: an operating system, one or more application programs, other program modules, and program data, each of which or some combination may include an implementation of a network environment.

[0129] Bus 430 may represent one or more of several types of bus structures, including a memory unit bus or memory unit controller, a peripheral bus, an accelerated graphics port, a processing unit, or a local bus using any of a variety of bus architectures.

[0130] The electronic device 400 may also communicate with one or more external devices 500 (e.g., keyboards, pointing devices, Bluetooth devices, etc.), may also communicate with one or more devices that enable a user to interact with the electronic device 400, and / or communicate with any device that enables the electronic device 400 to communicate with one or more other computing devices (e.g., routers, modems, etc.). Such communication may be performed through an I / O (input / output) interface 450, wherein the I / O interface 450 may also be connected to a display unit 440 to display the communication content through the display unit 440. In addition, the electronic device 400 may also communicate with one or more networks (e.g., a local area network (LAN), a wide area network (WAN), and / or a public network, such as the Internet) through a network adapter 460. As shown in the figure, the network adapter 460 communicates with other modules of the electronic device 400 through the bus 430. It should be understood that, although not shown in the figure, other hardware and / or software modules may be used in conjunction with the electronic device 400, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems.

[0131] The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored as one or more instructions or codes on a computer-readable medium or transmitted via a computer-readable medium. Other examples and implementations are within the scope and spirit of the present invention and the appended claims. For example, due to the nature of software, the functions described above may be implemented using software executed by a processor, hardware, firmware, hard wiring, or a combination of any of these. In addition, each functional unit may be integrated into a processing unit, each unit may exist physically separately, or two or more units may be integrated into one unit.

[0132] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only schematic. For example, the division of units can be a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0133] The units described as separate components may or may not be physically separated, and the components of the control device may or may not be physical units, that is, they may be located in one place or distributed in multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0134] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, server or network device, etc.) to perform all or part of the steps of the methods of each embodiment of the present invention. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic disk or optical disk, etc., which can store program code.

[0135] According to a third aspect of an embodiment of the present application, a computer-readable storage medium is provided, in which at least one computer program instruction is stored. The at least one computer program instruction is loaded and executed by a processor to implement the operations performed by any method described in the first aspect.

[0136] The computer readable storage medium may be a portable compact disk read-only memory (CD-ROM) and include program code, and may be run on a terminal device, such as a personal computer. However, the computer readable storage medium of the present application is not limited thereto, and in the present application, the readable storage medium may be any tangible medium containing or storing a program, which may be used by or in combination with an instruction execution system, apparatus, or device.

[0137] The readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination thereof. More specific examples of readable storage media (a non-exhaustive list) include: an electrical connection with one or more conductors, a portable disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof.

[0138] Program code for performing the operations of the present application may be written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Java, C++, etc., and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user computing device, partially on the user device, as a separate software package, partially on the user computing device and partially on a remote computing device, or entirely on a remote computing device or server. In the case of a remote computing device, the remote computing device may be connected to the user computing device through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computing device (e.g., via the Internet using an Internet service provider).

[0139] The above description is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present application shall be included in the scope of the claims of the present application.

Claims

1. A control method for a grinding mill, characterized in that: The grinding mill group includes a first process equipment, the first process equipment includes: a grinding mill, a first pump sump and a cyclone group, the grinding mill is provided with a return port and a discharge port, the first pump sump is connected to the return port, the first pump sump is connected to the cyclone group, the cyclone group is provided with a first outlet and a second outlet, the first outlet is connected to the return port, the ore material particle size output by the second outlet is smaller than the ore material particle size output by the first outlet, the method includes: Obtaining a particle size ratio of a target mineral material outputted from the second outlet of the cyclone group, wherein the mineral material particle size of the target mineral material is less than or equal to a preset particle size threshold, and the particle size ratio is a ratio between the content of the target mineral material and the content of the total mineral material outputted from the second outlet; If the particle size ratio is not within the preset particle size ratio range, the water addition rate entering the first pump slurry pool is adjusted until the particle size ratio is within the particle size ratio range, wherein the water addition rate is positively correlated with the particle size ratio.

2. The method according to claim 1, characterized in that The first pump pool includes a water adding valve, and the water adding rate entering the first pump pool is adjusted until the particle size ratio is within the particle size ratio range, including: The opening of the water adding valve is adjusted according to a preset first step length, and the particle size ratio is reacquired after each adjustment of the opening until the particle size ratio is within the particle size ratio range, and the adjustment of the opening of the water adding valve is stopped, wherein the opening of the water adding valve is positively correlated with the particle size ratio.

3. The method according to claim 1, characterized in that The first pump slurry tank is provided with a first motor. After the particle size ratio is within the particle size ratio range, the method further comprises: Obtaining the current liquid level of the first pump slurry pool; If the current liquid level is not within the preset liquid level range, the frequency of the first motor is adjusted until the current liquid level is within the liquid level range, wherein the frequency of the first motor is negatively correlated with the current liquid level.

4. The method according to claim 3, characterized in that The adjusting the frequency of the first motor until the current liquid level is within the liquid level range includes: The frequency of the first motor is adjusted according to a preset second step length, and the current liquid level is reacquired after each adjustment of the frequency until the current liquid level is within the liquid level range, and the frequency of the first motor is stopped from being adjusted.

5. The method according to claim 3, characterized in that: The cyclone group includes a plurality of cyclones. After the step of waiting until the current liquid level is within the liquid level range, the method further includes: Obtain the feed pressure of the cyclone; If the feed pressure is not within a preset pressure range, the opening and closing state of at least one of the cyclones is adjusted, wherein the feed pressure is negatively correlated with the number of cyclones in the open state, or the feed pressure is positively correlated with the number of cyclones in the closed state.

6. The method according to claim 5, characterized in that The step of adjusting the opening and closing state of at least one of the cyclones comprises: If the feed pressure is less than the pressure range, the cyclones are closed one by one, and the feed pressure is re-acquired after each cyclone is closed, until the feed pressure is within the pressure range, and the closing of the remaining cyclones is stopped; If the feed pressure is greater than the pressure range, the cyclones are opened one by one, and the feed pressure is re-acquired after each opening of the cyclone until the feed pressure is within the pressure range, and the opening of the remaining cyclones is stopped.

7. The method according to claim 1, characterized in that The first pumping pool is provided with a pumping pipeline, and the pumping pipeline is connected to the cyclone group. In the process of adjusting the water addition rate entering the first pumping pool, the method further includes: Detecting the ore concentration fed from the first pump slurry pool to the cyclone group through the pump slurry pipeline; If the feed concentration exceeds the preset feed concentration range, the water addition rate is stopped from being adjusted and an alarm is issued.

8. The method according to claim 1, characterized in that After the step of waiting until the particle size ratio is within the particle size ratio range, the method further comprises: Obtaining the current liquid level of the first pump slurry pool; If the current liquid level is not within the preset liquid level range, the feed rate entering the first pump pool is adjusted until the current liquid level is within the liquid level range, wherein the feed rate is positively correlated with the current liquid level.

9. The method according to claim 1, characterized in that: The grinding mill group further includes a second process equipment. In the grinding process flow, the second process equipment is operated in the next process of the first process equipment. After the particle size ratio is within the particle size ratio range, the method further includes: obtaining a circulating load of the second process equipment; If the circulating load is less than a preset load range, controlling the first process equipment to operate according to the lower limit value of the particle size ratio range; If the circulating load is greater than the load range, the first process equipment is controlled to operate according to the upper limit value of the particle size ratio range.

10. The method according to claim 9, characterized in that The second process equipment includes a second pump slurry tank and a second motor, and obtaining the circulation load of the second process equipment includes: The liquid level of the second pump slurry pool or the current of the second motor is obtained, wherein the liquid level of the second pump slurry pool is positively correlated with the circulating load, and the current of the second motor is positively correlated with the circulating load.

Images