Flotation liquid level control method

Abstract

The invention belongs to the technical field of mineral separation, and particularly relates to a flotation liquid level control method in the froth flotation process. The problem that the flotation liquid level is unstable in the foam flotation process, and then the flotation effect is affected is solved. The method mainly comprises a total liquid level control part and a balance liquid level control part, the total liquid level control part is characterized in that all the flotation cells connected in series are regarded as a whole, and the total amount of ore pulp in all the flotation cells is controlled by controlling a liquid level adjusting device at the tail end; and the balance liquid level control is realized by controlling other liquid level adjusting devices except the liquid level adjusting device at the tail end, so that the balance control of the liquid levels of the flotation cell where the adjusting devices are located and the next flotation cell is realized.

Description

Technical Field

[0001] The invention belongs to the technical field of mineral processing, and in particular relates to a flotation liquid level control method in a froth flotation process. Background Art

[0002] Froth flotation plays an absolutely important role in the contemporary mineral processing field and is the main process for processing and recovering fine and micro-fine minerals. During the entire flotation process, the stability of the liquid level of each flotation cell is one of the main factors affecting the separation effect of the flotation process. A large part of the existing flotation level control system adopts the strategy of independently controlling the liquid level of a single flotation cell, without considering multiple flotation cells connected in series as a whole, and the control effect is poor. Summary of the invention

[0003] The invention aims to solve the problem of unstable flotation liquid level in the froth flotation process.

[0004] In order to achieve the above goals, a new flotation level control method is proposed, which mainly adopts the following technical measures: Firstly, the actual liquid level of each flotation tank and the actual opening of each liquid level regulating device are obtained in real time through the liquid level sensor and the opening feedback device of the liquid level regulating device.

[0005] Then, the total liquid level of all the flotation cells connected in series is controlled by controlling the liquid level regulating device at the very end; all the flotation cells connected in series are regarded as a whole, the target liquid level values ​​of all the flotation cells are summed up, and the result is used as the target value of the total liquid level; the actual liquid level values ​​of all the flotation cells are summed up, and the result is used as the actual value of the total liquid level; based on the target value and actual value of the total liquid level, the liquid level regulating device at the very end is controlled so that the actual value of the total liquid level approaches the target value of the total liquid level, thereby controlling the total amount of slurry in all the flotation cells and further realizing the total liquid level control.

[0006] At the same time, through the controller, by controlling other liquid level regulating devices except the terminal liquid level regulating device, balanced control of the liquid levels of the flotation cell where the regulating device is located and the next flotation cell is achieved. First, the difference in liquid level deviation between the flotation cell where the liquid level regulating device is located and the next flotation cell is calculated. The calculation formula is: difference in liquid level deviation = (actual liquid level of the flotation cell where the liquid level regulating device is located - target liquid level of the flotation cell where the liquid level regulating device is located) - (actual liquid level of the next flotation cell after the liquid level regulating device - target liquid level of the next flotation cell after the liquid level regulating device). Based on the difference in liquid level deviation, other liquid level regulating devices except the terminal liquid level regulating device are controlled to make the difference in liquid level deviation approach 0, thereby achieving balanced control of the liquid levels of the flotation cell where the regulating device is located and the next flotation cell.

[0007] The controller is executed periodically at a specific time, and the liquid level adjustment device is activated once every cycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] In order to more clearly illustrate the specific implementation of the present invention or the technical solution in the prior art, the drawings required for use in the specific implementation or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are an implementation of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0009] Figure 1 This is a control logic diagram of Example 1 of the present invention.

[0010] In the figure: 1-controller, 2-1# flotation tank liquid level regulating device, 3-2# ​​flotation tank liquid level regulating device, 4-3# flotation tank liquid level regulating device, 5-flotation sorting process, 6-1# flotation tank liquid level sensor, 7-2# flotation tank liquid level sensor, 8-3# flotation tank liquid level sensor, 9-1# flotation tank liquid level regulating device opening feedback device, 10-2# flotation tank liquid level regulating device opening feedback device, 11-3# flotation tank liquid level regulating device opening feedback device. DETAILED DESCRIPTION

[0011] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0012] Firstly, the actual liquid level of 1# flotation tank, the actual liquid level of 2# flotation tank, the actual liquid level of 3# flotation tank, the opening of 1# flotation tank level regulating device, the opening of 2# flotation tank level regulating device and the opening of 3# flotation tank level regulating device are obtained in real time through 1# flotation tank level sensor 6, 2# flotation tank level sensor 7, 3# flotation tank level sensor 8, 1# flotation tank level regulating device opening feedback device 9, 2# flotation tank level regulating device opening feedback device 10 and 3# flotation tank level regulating device opening feedback device 11.

[0013] Then, the actual value SUM_PV of the total liquid level and the target value SUM_SP of the total liquid level are calculated through controller 1. The calculation formula of the actual value SUM_PV of the total liquid level is: SUM_PV=actual liquid level of 1# flotation tank+actual liquid level of 2# flotation tank+actual liquid level of 3# flotation tank, and the calculation formula of the target value SUM_SP of the total liquid level is: SUM_SP=target value of 1# flotation tank liquid level+target value of 2# flotation tank liquid level+target value of 3# flotation tank liquid level.

[0014] Then, the controller 1 calculates the adjustment amplitude Step 3 of the 3# liquid level regulating device 4. Here, all the flotation cells connected in series are regarded as a whole. The total amount of slurry in all flotation cells is controlled by the last 3# liquid level regulating device 4 at the tail end to achieve total liquid level control.

[0015] Furthermore, in Example 1, the control strategy of proportional control is used, and the calculation formula of the adjustment amplitude Step3 is: Step3=K1 (SUM_PV-SUM_SP). K1 is the proportional coefficient of proportional adjustment, and its value range is: K1>0, which needs to be determined in the actual debugging process.

[0016] Furthermore, the opening output Out3 of the 3# liquid level regulating device 4 is calculated.

[0017] Furthermore, the calculation formula of Out3 is: Out3=opening of 3# flotation tank liquid level regulating device+Step3.

[0018] At the same time, the difference PC1 of the liquid level deviation between the 1# flotation tank and the 2# flotation tank, and the difference PC2 of the liquid level deviation between the 2# flotation tank and the 3# flotation tank are calculated through the controller 1. The calculation formula of the difference PC1 of the liquid level deviation between the 1# flotation tank and the 2# flotation tank is: PC1=(actual liquid level of the 1# flotation tank-target liquid level of the 1# flotation tank)-(actual liquid level of the 2# flotation tank-target liquid level of the 2# flotation tank), and the calculation formula of the difference PC2 of the liquid level deviation between the 2# flotation tank and the 3# flotation tank is: PC2=(actual liquid level of the 2# flotation tank-target liquid level of the 2# flotation tank)-(actual liquid level of the 3# flotation tank-target liquid level of the 3# flotation tank).

[0019] At the same time, the controller 1 calculates the adjustment amplitude Step 1 of the 1# liquid level regulating device 2. The function of the 1# liquid level regulating device 2 is to balance the liquid levels of the 1# flotation tank and the 2# flotation tank, thereby achieving balanced liquid level control of the 1# flotation tank and the 2# flotation tank.

[0020] Furthermore, in Example 1, the control strategy of proportional control is used, and the calculation formula of the adjustment amplitude Step1 is: Step1=K2 PC1. K2 is the proportional coefficient of proportional adjustment, and its value range is: K2>0, which needs to be determined in the specific actual debugging process.

[0021] Furthermore, the opening output Out1 of the 1# liquid level regulating device 2 is calculated.

[0022] Furthermore, the calculation formula of Out1 is: Out1=1# flotation tank liquid level regulating device opening+Step1.

[0023] At the same time, the controller 1 calculates the adjustment amplitude Step 2 of the 2# liquid level regulating device 3. The function of the 2# liquid level regulating device 3 is to balance the liquid levels of the 2# flotation tank and the 3# flotation tank, thereby achieving balanced liquid level control of the 2# flotation tank and the 3# flotation tank.

[0024] Furthermore, in Example 1, the control strategy of proportional control is used, and the calculation formula of the adjustment amplitude Step2 is: Step2=K3 PC2. K3 is the proportional coefficient of proportional adjustment, and its value range is: K3>0, which needs to be determined in the specific actual debugging process.

[0025] Furthermore, the opening output Out2 of the 2# liquid level regulating device 3 is calculated.

[0026] Furthermore, the calculation formula of Out2 is: Out2=2# flotation tank liquid level regulating device opening+Step2.

[0027] Furthermore, the controller 1 is executed periodically at a specific time T. After each cycle T, the output of each liquid level regulating device is refreshed once, and each liquid level regulating device is adjusted once. The cycle time T needs to be determined in the specific actual debugging process, and the value range is: 20s ≤ T ≤ 180s.

Claims

1. A flotation level control method, Features: First, the actual liquid level of each flotation tank and the actual opening of each liquid level regulating device are obtained in real time through the liquid level sensor and the opening feedback device of the liquid level regulating device. Then, the total liquid level of all the flotation tanks connected in series is controlled by controlling the last liquid level regulating device. By controlling other liquid level regulating devices except the last liquid level regulating device, the balance control of the flotation tank where the regulating device is located and the next flotation tank is achieved. The method of controlling the total liquid level of all the flotation tanks connected in series by controlling the liquid level regulating device at the end is: All the flotation cells connected in series are regarded as a whole, the target liquid level values ​​of all the flotation cells are summed up, and the result is used as the target value of the total liquid level. The actual liquid level values ​​of all the flotation cells are summed up, and the result is used as the actual value of the total liquid level. Based on the target value and actual value of the total liquid level, the liquid level regulating device at the end is controlled to make the actual value of the total liquid level approach the target value of the total liquid level, so as to realize the control of the total amount of slurry in all flotation cells, and then realize the total liquid level control.

2. The flotation level control method according to claim 1, Features: The method for achieving balanced control of the liquid levels of the flotation tank where the regulating device is located and the next flotation tank by controlling the other liquid level regulating devices except the last liquid level regulating device is as follows: First, calculate the difference in liquid level deviation between the flotation cell where the liquid level regulating device is located and the next flotation cell. The calculation formula is: Liquid level deviation difference = (actual liquid level of the flotation cell where the liquid level regulating device is located - target liquid level of the flotation cell where the liquid level regulating device is located) - (actual liquid level of the next flotation cell after the liquid level regulating device - target liquid level of the next flotation cell after the liquid level regulating device). Based on the difference in liquid level deviation, control the other liquid level regulating devices except the last liquid level regulating device to make the difference in liquid level deviation approach 0, thereby achieving balanced control of the liquid levels of the flotation cell where the regulating device is located and the next flotation cell.

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