An intelligent automatic control system for the dosing concentration in quartz sand ore dressing

Abstract

The present invention discloses an intelligent automatic control system for dosing concentration in quartz sand beneficiation, which includes a dosing machine, a concentration detector, a particle size analyzer and a controller. The dosing pipeline of the concentration detector and the dosing machine is placed in a thickener. The thickener is provided with a pulp outlet and a water inlet, and an electric valve is arranged at the water inlet. The particle size analyzer is arranged at the pulp outlet. Both the concentration detector and the particle size analyzer are connected to the signal acquisition port of the controller, and both the electric valve and the dosing valve of the dosing machine are connected to the IO control port of the controller; the controller collects the concentration and particle size of the pulp and adjusts the opening degrees of the dosing valve of the dosing machine and the water pipe electric valve through the PID algorithm to obtain the pulp with a preset concentration ratio. The advantages of the present invention are as follows: it realizes the automatic control of the dosing concentration, has a good concentration ratio effect, stable production indexes, improves the quality of concentrate, does not require personnel to be on duty beside the equipment, saves human resources, has a high degree of automation, and can realize remote automatic control.

Description

Technical Field

[0001] The present invention relates to the technical field of quartz ore processing, and more particularly to an intelligent automatic control system for dosing concentration in quartz sand ore dressing. Background Art

[0002] During the natural formation process of ores or during the crushing and grinding process, fine particles and slime will be generated. Research shows that the scrubbing concentration of quartz sand ore is good between 50% - 60%, but to a certain extent, it also increases the difficulty of quartz ore dressing and purification. In principle, the scrubbing time is based on initially meeting the product quality requirements and should not be too long. A too long time will increase equipment wear, energy consumption, and the cost of ore dressing and purification. For example, a production process for processing super white sand from marine sedimentary natural quartz sand disclosed in Chinese Patent Publication No. CN102320748A adds a NaOH solution with a mass percentage concentration of 50 - 60% for alkali scrubbing, with an addition amount of 4 - 6 Kg / t and a scrubbing time of 10 - 20 min. However, at present, most quartz ore dressing plants use manual experience to judge and control the scrubbing concentration of the pulp in the thickener.

[0003] The traditional dosing concentration control system is manually controlled. In the actual production process of quartz sand ore dressing plants, it is necessary to manually adjust the dosing valve of the dosing (NaOH) machine and the opening degree of the electric water valve to achieve the mixing of medicine and water, thereby achieving the control of the scrubbing concentration. In the production process, the situation of unstable feed and water flow often occurs, resulting in the concentration of the mixed solution not meeting the requirements. Therefore, traditional manual experience cannot be accurately controlled, resulting in poor concentration ratio effect, unstable production indexes, seriously affecting the quality of concentrate, and requiring personnel to be on duty beside the equipment, wasting human resources, having a low degree of automation, and being difficult to achieve remote automatic control. With the development of mechanization, automation, and intelligence, the requirements of each production enterprise for the automatic and intelligent operation of equipment are gradually increasing. It is very necessary to design an automatic control system for dosing concentration. Summary of the Invention

[0004] The technical problem to be solved by the present invention is that in quartz sand ore dressing plants, manual experience is used to control the dosing concentration, resulting in poor concentration ratio effect, unstable production indexes, seriously affecting the quality of concentrate, and requiring personnel to be on duty beside the equipment, wasting human resources, having a low degree of automation, and being difficult to achieve remote automatic control.

[0005] The present invention realizes the solution of the above technical problems through the following technical means: An intelligent automatic control system for dosing concentration in quartz sand beneficiation, including a dosing machine, a concentration detector, a particle size analyzer, and a controller. The dosing pipeline of the concentration detector and the dosing machine is placed in a thickener. The thickener is provided with a pulp outlet and a water inlet. An electric valve is provided at the water inlet. The particle size analyzer is arranged at the pulp outlet. The concentration detector and the particle size analyzer are both connected to the signal acquisition port of the controller. The electric valve and the dosing valve of the dosing machine are both connected to the IO control port of the controller. The controller collects the concentration and particle size of the pulp and adjusts the opening degrees of the dosing valve of the dosing machine and the electric valve of the water pipe through the PID algorithm to obtain the pulp with a preset concentration ratio.

[0006] The present invention respectively detects the dosing concentration and the particle size through a concentration detector and a particle size analyzer, and feeds them back to the controller. The controller collects the concentration and particle size of the pulp and adjusts the opening degrees of the dosing valve of the dosing machine and the electric valve of the water pipe through the PID algorithm to obtain the pulp with a preset concentration ratio, realizing the automatic control of the dosing concentration. The concentration ratio effect is good, the production indexes are stable, the concentrate quality is improved, no personnel need to be on duty beside the equipment, human resources are saved, the automation degree is high, and remote automatic control can be realized.

[0007] Further, the intelligent automatic control system for dosing concentration in quartz sand beneficiation further includes an electromagnetic flowmeter. The electromagnetic flowmeter is arranged in the pipeline where the water inlet of the thickener is located. The electromagnetic flowmeter is connected to the sampling port of the controller and is used to detect the water flow rate and feed it back to the controller for facilitating the real-time monitoring of the water addition amount.

[0008] Further, when the scrubbing concentration and particle size of the pulp in the thickener are within the set value range, the controller controls the opening degrees of the dosing valve of the dosing machine and the electric valve according to the PID algorithm. When the scrubbing concentration and particle size are outside the set value range, a system alarm will be generated, and the dosing valve and the electric valve will be closed.

[0009] Even further, when a system alarm occurs, the system automatically switches to manual control for manual troubleshooting.

[0010] Even further, the intelligent automatic control system for dosing concentration in quartz sand beneficiation further includes a host computer. The host computer is connected to the controller, and the main interface of the host computer displays the system alarm information in the form of a pop-up window.

[0011] Even further, when the fault is eliminated and it is necessary to restore the normal operation state, click the alarm reset button on the main interface of the host computer to switch the system to the automatic mode.

[0012] Even further, the PID algorithm includes:

[0013] The controller collects the concentration and particle size of the pulp, compares them with the preset concentration and particle size respectively to obtain the concentration deviation value and the particle size deviation value, obtains the first ratio of the preset chemical addition amount and water addition amount according to the concentration deviation value, obtains the second ratio of the preset chemical addition amount and water addition amount according to the particle size deviation value. When the concentration deviation value is positive, compare the first ratio and the second ratio, and select the smaller one of the first ratio and the second ratio for output to adjust the concentration and particle size. When the concentration deviation value is negative, compare the first ratio and the second ratio, and select the larger one of the first ratio and the second ratio for output to adjust the concentration and particle size.

[0014] Further, a first electric actuator is provided on each of the electric valves. The controller collects the concentration and particle size of the pulp, obtains the ratio of the chemical addition amount and water addition amount through the PID algorithm, multiplies it by the preset share coefficient to obtain the water addition amount, converts it into a 4-20 mA current signal and outputs it to the first electric actuator to adjust the opening degree of the electric valve of the water pipe.

[0015] Further, a second electric actuator is provided on the chemical addition valve. The controller collects the concentration and particle size of the pulp, obtains the ratio of the chemical addition amount and water addition amount through the PID algorithm, multiplies it by the preset share coefficient to obtain the chemical addition amount, converts it into a 4-20 mA current signal and outputs it to the second electric actuator to adjust the opening degree of the chemical addition valve of the chemical addition machine.

[0016] Further, the pulp outlet is arranged at the bottom of the thickener, and the water inlet is arranged on the side of the lower part of the thickener.

[0017] The advantages of the present invention are as follows:

[0018] (1) In the present invention, the chemical addition concentration and particle size are respectively detected by a concentration detector and a particle size analyzer and fed back to the controller. The controller collects the concentration and particle size of the pulp and adjusts the opening degrees of the chemical addition valve of the chemical addition machine and the electric valve of the water pipe through the PID algorithm to obtain the pulp with a preset concentration ratio, realizing the automatic control of the chemical addition concentration. The concentration ratio effect is good, the production indexes are stable, the concentrate quality is improved, no personnel need to be on duty beside the equipment, human resources are saved, the automation degree is high, and remote automatic control can be realized.

[0019] (2) In the present invention, the opening degrees of the chemical addition valve of the chemical addition machine and the electric valve are intelligently adjusted through the PID algorithm to realize the efficient and accurate concentration ratio of materials, effectively improving the quality and qualification rate of products.

[0020] (3) When the scrubbing concentration and particle size are outside the set value range in the present invention, the system will give an alarm, and the chemical addition valve and the electric valve will be closed. The main interface of the upper computer will display the system alarm information in the form of a pop-up window, which is convenient for the staff to detect faults in time.

[0021] (4) The present invention obtains the first ratio of the preset chemical dosing amount and water addition amount based on the concentration deviation value, and obtains the second ratio of the preset chemical dosing amount and water addition amount based on the particle size deviation value. When the concentration deviation value is positive, it indicates that the concentration exceeds the preset value and the particle size is lower than the preset value. At this time, the chemical dosing amount should be reduced to make the concentration and particle size meet the requirements. However, only one of the two calculated ratios can be selected for the final output control. Therefore, compare the first ratio and the second ratio, and select the smaller one of the first ratio and the second ratio for output concentration and particle size adjustment to ensure that the selected ratio can meet both the concentration requirement and the particle size requirement. Similarly, when the concentration deviation value is negative, compare the first ratio and the second ratio, and select the larger one of the first ratio and the second ratio for output concentration and particle size adjustment. Brief Description of the Drawings

[0022] Figure 1 It is a schematic structural diagram of an intelligent chemical dosing concentration automatic control system for quartz sand ore dressing disclosed in an embodiment of the present invention. Detailed Embodiments

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0024] As Figure 1 shown, an intelligent chemical dosing concentration automatic control system for quartz sand ore dressing includes a concentration detector 1, a chemical dosing machine, an electromagnetic flowmeter, a particle size analyzer 5, a controller 6, and a host computer. The concentration detector 1 and the chemical dosing pipeline 2 of the chemical dosing machine are both placed in the thickener 3. The concentration detector 1 is inserted into the thickener 3 from left to right, and the chemical dosing pipeline 2 of the chemical dosing machine is vertically inserted into the thickener from above the thickener 3. The thickener 3 is provided with a pulp outlet 301 and a water inlet 302. The pulp outlet 301 is arranged at the bottom of the thickener 3, and the water inlet 302 is arranged on the side of the lower part of the thickener 3. An electric valve 4 is arranged at the water inlet 302. The particle size analyzer 5 is arranged at the pulp outlet 301. The electromagnetic flowmeter is arranged in the pipeline where the water inlet 302 of the thickener 3 is located. The electromagnetic flowmeter is connected to the sampling port of the controller 6 for detecting the water flow rate and feeding it back to the controller 6 to facilitate real-time monitoring of the water addition amount. Both the concentration detector 1 and the particle size analyzer 5 are connected to the signal acquisition port of the controller 6. The electric valve 4 and the chemical dosing valve 7 of the chemical dosing machine are both connected to the IO control port of the controller 6. The host computer is connected to the controller 6. Figure 1It is a schematic structural diagram of the automatic control system provided by the present invention. The dashed part in the figure is the electric control part.

[0025] The controller 6 collects the concentration and particle size of the pulp and adjusts the dosing valve 7 of the dosing machine and the opening degree of the electric valve 4 of the water pipe through the PID algorithm to obtain the pulp with a preset concentration ratio. The following details the process of dosing concentration control:

[0026] In practical applications, for the set value ranges of the preset drug amount and water amount, if it exceeds the set range, it indicates that the control system has a fault and the automatic control should be stopped. Therefore, when the scrubbing concentration and particle size of the pulp in the thickener 3 are within the set value range, the controller 6 controls the opening degrees of the dosing valve 7 of the dosing machine and the electric valve 4 according to the PID algorithm. When the scrubbing concentration and particle size are outside the set value range, a system alarm will be generated, and the dosing valve 7 and the electric valve 4 will be closed.

[0027] When a system alarm is generated, a pop-up window on the main interface of the upper computer shows that an alarm has occurred. At this time, the dosing valve 7 and the electric valve 4 are closed, and the system automatically switches to manual control for manual troubleshooting. When the fault is eliminated and it is necessary to resume the normal operation state, click the alarm reset button on the main interface of the upper computer to switch the system to the automatic mode. The automatic control system of the present invention includes control modes such as manual, semi-automatic, and automatic, which can not only achieve remote control, improve the automation level of the concentrator, but also be operated nearby for emergency handling.

[0028] The processing process of the PID algorithm includes:

[0029] The controller 6 collects the concentration and particle size of the pulp, compares them with the preset concentration and particle size respectively to obtain the concentration deviation value and the particle size deviation value. According to the concentration deviation value, the first ratio of the preset drug amount and water amount is obtained, and according to the particle size deviation value, the second ratio of the preset drug amount and water amount is obtained. When the concentration deviation value is positive, compare the first ratio and the second ratio, and select the smaller one of the first ratio and the second ratio for output concentration and particle size adjustment. When the concentration deviation value is negative, compare the first ratio and the second ratio, and select the larger one of the first ratio and the second ratio for output concentration and particle size adjustment.

[0030] For example, the controller 6 collects the concentration of the pulp as 125 and the particle size as 38, and compares them with the preset concentration of 115 and particle size of 45 respectively to obtain a concentration deviation value of 10 and a particle size deviation value of -7. According to the concentration deviation value and the corresponding relationship between the concentration deviation value stored in the controller 6 and the ratio, the first ratio of the preset drug addition amount and water addition amount is obtained as 5:7. According to the particle size deviation value and the corresponding relationship between the particle size deviation value stored in the controller 6 and the ratio, the second ratio of the preset drug addition amount and water addition amount is obtained as 4:9. The positive concentration deviation value indicates that the concentration exceeds the preset value and the particle size is lower than the preset value. At this time, the drug addition amount should be reduced to make the concentration and particle size meet the requirements. However, only one of the two calculated ratios can be selected for the final output control. In order to make the finally selected ratio meet both the concentration control requirements and the particle size control requirements, the second ratio of 4:9 is selected for output concentration and particle size adjustment. Similarly, the controller 6 collects the concentration of the pulp as 100 and the particle size as 50, and compares them with the preset concentration of 115 and particle size of 45 respectively to obtain a concentration deviation value of -15 and a particle size deviation value of 5. According to the concentration deviation value and the corresponding relationship between the concentration deviation value stored in the controller 6 and the ratio, the first ratio of the preset drug addition amount and water addition amount is obtained as 8:3. According to the particle size deviation value and the corresponding relationship between the particle size deviation value stored in the controller 6 and the ratio, the second ratio of the preset drug addition amount and water addition amount is obtained as 7:3. The negative concentration deviation value indicates that the concentration is lower than the preset value and the particle size is higher than the preset value. At this time, the drug addition amount should be increased to make the concentration and particle size meet the requirements. However, only one of the two calculated ratios can be selected for the final output control. In order to make the finally selected ratio meet both the concentration control requirements and the particle size control requirements, the first ratio of 8:3 is selected for output concentration and particle size adjustment. The above values are only examples randomly selected to facilitate the understanding of the technical principle of the present invention, and corresponding settings are made according to the actual situation in actual applications.

[0031] After obtaining the ratio of the drug addition amount and water addition amount as above, it is necessary to control the opening degrees of the electric valve 4 and the drug addition valve 7 to achieve this ratio. The electric valve 4 is provided with a first electric actuator. After the controller 6 collects the concentration and particle size of the pulp and obtains the ratio of the drug addition amount and water addition amount through the PID algorithm, it multiplies by a preset share coefficient to obtain the water addition amount. For example, in the case of a ratio of 8:3, multiplying by the preset share coefficient of 10, the drug addition amount is obtained as 80 and the water addition amount is 30. The controller 6 converts the water addition amount of 30 into a 4-20 mA current signal and outputs it to the first electric actuator to adjust the opening degree of the water pipe electric valve 4.

[0032] The dosing valve 7 is provided with a second electric actuator. The controller 6 collects the concentration and particle size of the pulp and obtains the ratio of the dosing amount and the water addition amount through the PID algorithm, multiplies it by a preset share coefficient to obtain the dosing amount. For example, when the ratio is 8:3, multiplying by the preset share coefficient 10, the dosing amount is 80 and the water addition amount is 30. The controller 6 converts the dosing amount 80 into a 4-20 mA current signal and outputs it to the second electric actuator to adjust the opening of the dosing valve 7 of the dosing machine.

[0033] Through the above technical solutions, in the present invention, the concentration detector 1 and the particle size analyzer 5 respectively detect the dosing concentration and the particle size, and feedback them to the controller 6. The controller 6 collects the concentration and particle size of the pulp and adjusts the opening of the dosing valve 7 of the dosing machine and the water pipe electric valve 4 through the PID algorithm to obtain the pulp with a preset concentration ratio, realizing the automatic control of the dosing concentration, having a good concentration ratio effect, stable production indexes, improving the concentrate quality, not requiring personnel to be on duty beside the equipment, saving human resources, having a high degree of automation, and being able to realize remote automatic control.

[0034] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. An intelligent automatic control system for dosing concentration in quartz sand beneficiation, characterized in that, it includes a dosing machine, a concentration detector, a particle size analyzer and a controller. The dosing pipeline of the concentration detector and the dosing machine is placed in the thickener. The thickener is provided with a pulp outlet and a water inlet. An electric valve is provided at the water inlet. The particle size analyzer is arranged at the pulp outlet. The concentration detector and the particle size analyzer are both connected to the signal acquisition port of the controller. The electric valve and the dosing valve of the dosing machine are both connected to the IO control port of the controller; the controller collects the concentration and particle size of the pulp and adjusts the opening degrees of the dosing valve of the dosing machine and the water pipe electric valve through the PID algorithm to obtain the pulp with a preset concentration ratio; when the scrubbing concentration and particle size of the pulp in the thickener are within the set value range, the controller controls the opening degrees of the dosing valve of the dosing machine and the electric valve according to the PID algorithm. When the scrubbing concentration and particle size are outside the set value range, a system alarm will be generated, and the dosing valve and the electric valve will be closed; when a system alarm occurs, the system will automatically switch to manual control for manual troubleshooting; it also includes a host computer, which is connected to the controller, and the main interface of the host computer displays the system alarm information in the form of a pop-up window; the PID algorithm includes: the controller collects the concentration and particle size of the pulp, compares them with the preset concentration and particle size respectively to obtain the concentration deviation value and the particle size deviation value, obtains the first ratio of the preset dosing amount and water addition amount according to the concentration deviation value, obtains the second ratio of the preset dosing amount and water addition amount according to the particle size deviation value. When the concentration deviation value is positive, compare the first ratio and the second ratio, and select the smaller one of the first ratio and the second ratio for output concentration and particle size adjustment. When the concentration deviation value is negative, compare the first ratio and the second ratio, and select the larger one of the first ratio and the second ratio for output concentration and particle size adjustment.

2. The intelligent automatic control system for dosing concentration in quartz sand beneficiation according to claim 1, characterized in that, it further includes an electromagnetic flowmeter, which is arranged in the pipeline where the water inlet of the thickener is located. The electromagnetic flowmeter is connected to the sampling port of the controller and is used to detect the water flow rate and feedback it to the controller.

3. The intelligent automatic control system for dosing concentration in quartz sand beneficiation according to claim 1, characterized in that, when the fault is eliminated and it is necessary to restore the normal operation state, click the alarm reset button on the main interface of the host computer to switch the system to the automatic mode.

4. The intelligent automatic control system for dosing concentration in quartz sand beneficiation according to claim 1, characterized in that, a first electric actuator is provided on each of the electric valves. The controller collects the concentration and particle size of the pulp and obtains the ratio of the dosing amount and water addition amount through the PID algorithm, multiplies it by the preset share coefficient to obtain the water addition amount, converts it into a 4-20mA current signal and outputs it to the first electric actuator to adjust the opening degree of the water pipe electric valve.

5. The intelligent automatic control system for dosing concentration in quartz sand beneficiation according to claim 1, characterized in that, A second electric actuator is provided on the chemical dosing valve. The controller collects the concentration and particle size of the pulp, obtains the ratio of the chemical dosing amount and the water addition amount through the PID algorithm, multiplies it by a preset share coefficient to obtain the chemical dosing amount, converts it into a 4-20 mA current signal and outputs it to the second electric actuator to adjust the opening of the chemical dosing valve of the chemical dosing machine.

6. An intelligent chemical dosing concentration automatic control system for quartz sand beneficiation according to claim 1, characterized in that the pulp outlet is arranged at the bottom of the thickener, and the water inlet is arranged on the side of the lower part of the thickener.

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