SU755303A1 - Method of automatic control of single-stage cycle of wet disintegrating - Google Patents

Description

The invention relates to the field of automatic control of technological enrichment processes, and more specifically, to methods of automatic process control, wet grinding in a ball mill operating in a closed loop with a spiral classifier, and can be used in enrichment plants of color and ferrous metallurgy, having similar feedstock processing cycles.

There is a method of automatic control of one-stage cycle of wet grinding, including regulator. The weight of ore consumption at the mill inlet is corrected by the magnitude of the circulating load and the water flow control at the mill inlet [Ϊ]. However, this method does not provide * control.

There is another method of automatic control of a single-stage wet grinding cycle, including stabilizing the flow rate of the original ore into the mill by changing the ore consumption with a correction for changing the amount of water supplied to the classifier, stabilizing the size of the discharge of

the fixer change? - ’of water consumption in the classifier and stabilization of the ore-water ratio by changing the water flow in the mill [2]. In this method, the correction of water flow in the mill is carried out according to the change in the size of the graded sand. This method is closer to the described invention, however, its disadvantage is not that you can from t to t 5; I’m married to ikaln about the possible performance of the finished product of a given class with a note; x s i f i s i k o - m e x a c h i n e c c and x characteristics of the feedstock. This is due to the fact that the management does not support the optimum pulp density of the mill, which is in line with the quality of the raw material, because the mill size parameter used to correct ore consumption and the mill does not fully characterize the change in the type of initial ores, due to the fact that, firstly, the existing means of controlling the size of the sands of the classifier are imperfect, they give a large error, and secondly, with regard to e nn about th ρ a b a tokeno with; ι F and r. ί ί apparatus, size of sand on average

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is constant, and only their volume changes, i.e. Circulating cycle load. As a result of this corrective action on the size of the sands of the classifier, it is not enough to bring the grinding unit to the area of optimal modes, and therefore (significant fluctuations in the technological parameters and low quality of the grinding process control are observed.

The aim of the invention is to improve the control accuracy.

This is achieved by the fact that in the automatic control method of a single-stage wet grinding cycle, including stabilizing the flow rate of the original ore in the mill by changing the ore consumption with a correction for changing the amount of water supplied to the classifier, stabilizing the size of the classifier discharge by changing the water consumption to the classifier and stabilizing the ore- water "by changing the flow rate of water in the mill, additionally measure the density of the pulp. in the discharge of the classifier and adjust the flow of water and ore in the mill, depending on the density of the pulp in the discharge of the classifier.

The method of automatic control of a single-stage cycle of wet grinding can be implemented using a device whose scheme is shown in the drawing.

The scheme includes:

- a system for stabilizing the flow rate of the original ore to the mill, which contains the weighing unit 1, the ore consumption, the secondary device 2, the signal multiplier 3, the regulating device 4, the unit,

5 engine control 6 drive feeder;

. - a system for stabilizing the size of the discharge of the classifier, consisting of a size sensor 7, a secondary device 8, a regulating device 9, an actuator 10 of the valve 11; - ^ ore-water ratio stabilization system. , which contains the flow meter 12, the secondary Device 13 water flow in the mill, sensor.1, secondary device 2, signal multiplier 3, the regulating device 14, the actuator 15 of the valve 16;

- control system of water flow in the classifier, consisting of a water flow meter 17 and a secondary device 18 with access to the regulating device 4;

- a system for monitoring the density of the slime & a: a classifier, which contains a density meter 19, a secondary device 20, a signal multiplier 21 with access to control devices 4 and 14.

The grinding complex of a single-stage wet-grinding cycle consists of a mill 22 operating in a closed loop with a classifier 23. Both one-or two-spiral classifiers and hydrocyclones can be used as a classifier.

The process of wet grinding is controlled by influencing the costs of ore and water in a ball mill and the flow of water into the classifier as follows.

Optimal filling and pulp density in the mill is maintained by controlling the flow of water and ore to the mill.

When the physico-mechanical properties of the original ore change, for example, during the transition from solid to soft ores, the content of the finished product in the classifier discharge and the productivity of the finished product increase. The signal of the current size of the classifier discharge from the size sensor 7, through the secondary device 8 enters the regulator 9, changing through the actuator 10 and the valve 11 the water flow into the classifier in the direction of restoring the specified size.

Due to the change in flow rate, water in the discharge of the classifier, the pulp density and the circulating load change, and their change is proportional to the change in water consumption in the classifier discharge. The magnitude of the change in water consumption in the discharge of the classifier is used to correct the flow rate of the original ore, increasing it, according to a signal from the sensor 17, through the secondary device 18 to the regulator 4 of the system for stabilizing the flow of the original ore, which through the control unit 5 changes the speed of the drive motor 6 of the feeder, increasing the flow ores into the mill to such a size that the specified size is maintained in the discharge of the classifier.

The current ore consumption signal from sensor 1 through the secondary device 2 and signal multiplier 3 is fed to the regulator .14 of the ore-water stabilization system, which through the actuator 15. and the valve 16 changes the water flow to the ball mill. This stabilizes the operation of the grinding complex and increases the performance of both the initial feed and the weight yield of the finished product, while avoiding overgrinding of the feedstock.

While maintaining a stable size of the finished product on the Classifier, changing the type of ore will only affect the change in pulp density caused by a change in density (specific gravity) of the feedstock, which, in turn, is closely related to the content of the useful component and impregnation.

In proportion to the change in the density of the pulp in the discharge of the classifier measured by the sensor 19, through the secondary device 20 and the signal multiplier 755303

21 additionally we adjust the consumption of ore and water in a ball mill, acting on regulators 4 and 14.

This is the conclusion of the grinding complex in the mode of maintaining the maximum possible performance for a given-5 Go-type ore productivity and the fluctuations of the output window, of the mill and classifier are reduced.

With an increase in the size of the finished product in the discharge of the classifying apparatus, the operation of the stabilization and correction circuits occurs in the opposite direction.

All correction signals are received with coefficients that are determined experimentally and take into account the percentage of pre- ^e left of participation monitored parameters.

Claims (1)

Claims 20 A method of automatic control of a single-stage wet grinding cycle, including stabilizing the flow rate of the original ore to the mill by changing the ore consumption with a correction for changing the amount of water supplied to the classifier, stabilizing the size of the classifier drain by changing the water flow in the classifier and stabilizing the ore-water ratio by changing the water flow to the mill, characterized in that, in order to improve the control accuracy, the pulp density in the discharge of the classifier is additionally measured and the flow rate in odes and ores in the mill, depending on the density of the pulp in the discharge classifier.