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Method and device for controlling flotation cell liquid level

A control method and flotation cell technology, applied in liquid level control, adaptive control, general control system, etc., can solve the problems of mutual influence, unstable flotation process, difficult to stabilize flotation process, etc., to achieve synergy control effect

Inactive Publication Date: 2011-04-20
BEIJING GENERAL RES INST OF MINING & METALLURGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In the process of realizing the present invention, the inventor finds that the single-loop PID control method of the flotation tank liquid level in the prior art has the following problems at least: the method only focuses on the stability of the liquid level of the flotation tank of a single operation, and in the In the flotation process, due to the existence of various interference sources, the series distribution of flotation operations and the return of intermediate ore, the flotation operations are coupled and affect each other
For example, when the control of the liquid level of the flotation tank of an operation is unstable, it not only affects the liquid level of the flotation tank of the subsequent operation, but also affects the liquid level of the flotation tank of the previous operation through the return of middling ore, and then Make the whole flotation process in an unstable state
Therefore, it is difficult to achieve the stability of the entire flotation process by only performing single-loop PID control on the liquid level of the flotation tank for a single operation

Method used

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  • Method and device for controlling flotation cell liquid level
  • Method and device for controlling flotation cell liquid level
  • Method and device for controlling flotation cell liquid level

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Embodiment 1

[0025] The schematic diagram of the principle of a method for controlling the liquid level of a flotation cell proposed in this embodiment is as follows figure 1 As shown, the processing flow of the control method is as follows figure 2 As shown, the following processing steps are included:

[0026] Step 21, establish the control model of the liquid level of the flotation cell, and obtain the transfer function H of the liquid level of the flotation cell i (s).

[0027] The interference source of the liquid level of the flotation tank mainly comes from the pulp flow entering the flotation, the flow of the circulating pump, and the opening degree change of the regulating valve.

[0028] First, establish the control model of the liquid level of the flotation cell, the control module mainly includes: the transfer function H of the liquid level of the flotation cell i (s), the H i (s) is calculated as follows:

[0029] H i ( ...

Embodiment 2

[0059] In practical applications, due to the characteristics of the flotation process, the impact of interference is transitive. In order to eliminate the impact of interference and ensure the stability of the flotation process, the feed-forward feedback function needs to be implemented at the correct time. The feed-forward feedback function If it is too early, it will easily cause new fluctuations, and if it is too late, it will not be able to counteract the influence of interference. Therefore, the embodiment of the present invention proposes a delay action algorithm, so that the feedforward feedback action can be implemented correctly.

[0060] The valve adjustments of the liquid levels of multiple flotation tanks are stored in sequence according to the set time intervals. After the time intervals corresponding to the adjustments of each valve arrive, the adjustments of each valve are sequentially taken out, and the valve adjustments are adjusted according to the taken out va...

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Abstract

The embodiment of the invention provides a method and a device for controlling a flotation cell liquid level. The method mainly comprises the following steps of: obtaining a transfer function of the floatation cell liquid level according to a pre-established control model of the floatation cell liquid level; calculating a feedforward function of the floatation cell liquid level according to the transfer function of the floatation cell liquid level and a pre-established feedforward feedback control model; and calculating the feedforward feedback regulating quantity of the opening degree of a valve of the floatation cell liquid level according to a feedforward function of a feedforward controller of the floatation cell liquid level and the input ore pulp flow. In the method and the device provided by the embodiment of the invention, a feedforward feedback control algorithm and a delay effect algorithm are adopted, so cooperative control of the floatation flow liquid level is realized and the floatation flow is stabilized integrally through the cooperative action of the opening degree of each floatation cell tailings valve and the pump speed of an intermediate pump in the floatation flow.

Description

technical field [0001] The invention is applied to the field of industrial automatic control, especially to the flotation process, and is a method for stabilizing the flotation process based on the control of the flotation liquid level. Background technique [0002] The flotation process is one of the important links in mineral processing production. The stability of the flotation process directly affects the flotation production indicators and the economic benefits of the entire mineral processing plant. Therefore, it is extremely important and meaningful to realize the stable control of the flotation process Work. The stable control of the flotation process mainly depends on the stable control of the flotation liquid level, and the stable control of the flotation liquid level is a difficult problem in the flotation production. [0003] The commonly used control method for the liquid level of the flotation cell in the prior art is to control the liquid level of the flotati...

Claims

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Application Information

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IPC IPC(8): G05D9/12G05B13/04
Inventor 周俊武王焕钢徐宁徐文立李映根王赫
Owner BEIJING GENERAL RES INST OF MINING & METALLURGY
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