Floating beneficiation pulp on the flotation index values have a great impact, minerals are only at a suitable value in order to adequately flotation or suppressed; only agent in order to play a full role at an appropriate value. Therefore, the flotation slurry value must be automatically controlled.
There are usually two ways to control pH:
(1) Constant adjustment to keep the pH constant. This is a method that is more commonly used in some domestic factories. The slurry pH automatic adjustment system shown in Figure 5-4-1 consists of PHGF-13 acidity transmitter, PHG-21A industrial acidity meter, electronic potentiometer, regulator, servo amplifier, actuator and so on. The regulating valve is an open type diverting valve, which can clean the sludge in the valve at any time and can always keep the lime milk unblocked. Another type of pH automatic adjustment system is shown in Figure 5-4-2 and Figure 5-4-3. The system features a sampled time regulator in the conditioning system. The entire adjustment process is intermittently performed, thereby overcoming the overshoot and oscillation caused by the long delay time of the adjustment object; the lime milk concentration is automatically adjusted to keep the concentration of the lime water constant. The concentration measurement of lime milk was carried out by electro-mechanical method. Detection and control can also be used with the Model 8701 pH Detector with Microcomputer. It has detection and control functions, and has an electrode automatic cleaning device, which is more suitable for pH detection and control of pulp.
(2) Track the changes in ore properties and adjust the pH value in time to obtain better flotation indicators. For example, in the process of copper- nickel mixed flotation, the pH is adjusted to achieve the maximum possible recovery. The system uses a statistical "attempt method" based tuning algorithm (EVOP) to find the best operating point. It uses a time-sharing computer control program to automatically change the given value of the pH with a predetermined statistical model, allowing the flotation process to enter a new stable operating state, and then using the current-carrying X-ray analyzer to analyze the original, fine, The grade of the tailings, and calculate the export yield, compare it with the previous recovery rate to determine the direction and value of the next pH set value to achieve the best recovery rate. This exploration process is continuous. of. Usually every 6 minutes.
When installing the pH control system, pay attention to the choice of the pH meter probe installation position. Do not install it too close to the place where the lime is added so that the lime milk has not been thoroughly mixed with the slurry for the probe; it is not too far apart, increasing the lag time of the adjustment object. The representativeness of the test point should be considered, which reflects the pH of the entire subject.
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