SU1012985A1 - System for automatic control of single-stage wet disintegration process - Google Patents

Abstract

The AUTOMATIC CONTROL SYSTEM of a single-stage wet-measurement circuit, including a weighing device connected to the first signal multiplier, the first input of which is connected to the first input of the drive control regulator, the specific gravity sensor of the discharge-drain classifier connected via the second signal multiplier, and the unit, and the ri, the unit, and the ri, and the ri, the caller, and the pro-vfd unit, connected to the initiator; , tel and with the first input of the regulator of water supply to the mill, the sensor of the particle size of the classifier drain connected to the regulator of water supply to the classifier, flow rate water in the mill, connected to the second inlet of the water supply regulator to the mill, and water flow meter in the classifier, which, in order to improve the control accuracy, the system is equipped with a water supply correction regulator in the mill, and a third signal multiplier The second output of the first signal multiplier is connected to the first input of the water supply correction controller in the mill, and the water flow meter 5S to the classifier is connected to (L the third signal multiplier, the outputs of which are connected to the third input pa feeder actuator and the second input of the regulator armature rektsii supplying water to the mill, the output of which is connected to the third input of the regulator torus water supply to the mill.

Description

Yu

with

00 SP The invention relates to the automatic control of enrichment processes, in particular, to methods of automatic control of the Wet grinding process, and can be used in concentrating plants of non-ferrous and ferrous metallurgy, having ana;} ogy processing cycles of the feedstock. The known system of automatic control of a single-stage wet-grinding cycle, includes the supply control of the Original ore, the classifier's gravity discharge regulator and the ore-water ratio control tlj "However, this system does not ensure the achievement of the maximum possible cycle throughput of the finished product. This is because the regulation of the ratio of ore to water in the mill does not take into account the change in the density of the pulp in it, caused by a change in the amount of the liquid phase of the circulating load of the classifier. Also known is an automatic control system for a single-stage wet grinding cycle, including a weighing device connected to the first signal multiplier / whose first output is connected to the first input of the drive control regulator, the specific gravity sensor on the discharge of the classifier is connected via the second signal multiplier to the second input of the regulator the drive of the feeder and with the first input of the regulator of water supply to the mill, the sensor of the particle size of the classifier drain connected to the regulator of the water supply to the classifier, a water flow meter into the mill, connected to the second inlet of the water supply regulator to the mill, and a water flow meter to the classifier 2.,. . However, this system also does not provide high quality control, since the change in pulp density in the mill is not taken into account. The purpose of the invention is to improve the accuracy of control. This goal is achieved by the fact that the automatic control system of a single-stage wet-grinding cycle, including a weighing device connected to the first signal multiplier, the first output of which is connected to the first input of the drive control of the feeder, the sensor of the specific weight of the solid on the discharge classifier connected via the second diffuser a resident of the signals with the second input of the drive control of the feeder and with the first input of the regulator of the water supply to the mill, the grader’s particle size sensor connected to the water supply regulator to The water flow meter in the mill connected to the second inlet of the water supply regulator to the mill and the water flow meter to the mill is equipped with a water supply correction regulator to the mill and the third multiplier singgshov, the second output of the first signal multiplier is connected to the first input of the feed correction regulator water into the mill, and the water flow meter in the classifier is connected to the third signal multiplier, the outputs of which are connected to the third input of the drive control regulator and to the second input of the feed correction regulator water in the mill, the output of which is connected to the third input of the regulator torus water supply to the mill. The drawing schematically shows a device for implementing the method. The device contains a system for stabilizing the flow rate of the original ore to the mill, kegtor c. Includes the weighing device 1 orestable ore, the secondary device 2, the multiplier of 3 signals, the regulator 4 of the feeder,. | unit 5 of the control of the drive actuator motor 6, the classifier discharge size stabilization system, consisting of the size sensor 7, the secondary housing 8, the feed regulator 9 in the KJJacifikator, the actuator 10, valve II, and the ratio ore - water, which contains the flow meter 12, the second water flow meter 13 in the mill, the weight meter 1, the secondary device 2, the breeder 3 signals, the regulator 14 for supplying water to the mill, the actuator 15, the valves 16; a system for controlling the flow of water to a classifier consisting of a water flow meter 17 and a secondary device 18 by exiting the controller 4; the system for monitoring the specific gravity of the classifier solid at discharge, which contains the sensor 19 for specific gravity, the secondary device 20, the multiplier 21 and 22 signals with output to controller 4 and 14, and the controller 23 for correcting the water supply to the mill. The grinding complex of a single-stage wet-grinding cycle i consists of a mill 24 operating in a closed loop with a classifier 25. Both mechanical one- or two-double classifiers and hydrocyclones can be used as a classification apparatus. The wet grinding process control is carried out under the influence. on the costs of ore and water in a ball mill and water consumption in the classifier, as follows. Optimal filling and pulp density in the mill supports-1

with by adjusting the flow of water and ore to the mill.

When the physicomechanical properties of the original ore change, for example, during the transition from solid ore to soft ore, the content of the finished product in the discharge of the classifier and P1 increases: the productivity of the finished product. The signal of the current size of the classifier discharge from the size sensor 7, through the secondary device 8 is fed to the regulator 9, which changes the water flow through the actuator 10 and the valve 11 to the classifier to restore a given size to the classifier.

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

A change in the magnitude of the circulating load causes an additional change in the pulp density in the mill, due to a change in the amount of the liquid phase going with the sands of the classifier into the mill. The signals of the current ore consumption. From the weight meter 1 through the secondary device 2 and the multiplier of signals 3 and the water flow into the discharge of the classifier - from the meter 17, through the secondary device 18 and.

the signal multiplier 22 enters the correction controller 23 and then the regulator 14 of the stabilization system of the ore-water system, which through the actuator 15 and

valve 16 changes the flow rate of the water in the ball mill. This stabilizes the operation of the grinding complex and provides an increase in productivity both in terms of the initial

nutrition, and the weight output of the finished product.

At the same time, no overmilling of the initial one is allowed (LR.

While maintaining the stable size of the finished product at the classifier's discharge, the change in ore type only affects the change in pulp density, caused by changes in the density (specific gravity) of the raw material, which, in turn, is closely related to the content of the useful component and impregnation. In proportion to the change in the specific gravity of the classifier in the discharge, measured by the sensor 19, the secondary device 20 and the breeder 21 additionally adjust the flow of ore and water to the ball mill, affecting the regulator 4 and 14. This brings the grinding complex to the maximum possible this type of ore productivity and the fluctuations in the output of the mill and the classifier are reduced.

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

B. All correction signals are received from coefficients that are determined empirically.

Claims (1)

AUTOMATIC CONTROL SYSTEM FOR ONE-STAGE WET GRINDING CYCLE, including a weight measuring device connected to the first signal multiplier, the first input of which is connected to the first input of the feeder drive regulator, a specific gravity sensor on the drain of the classifier connected through the second signal multiplier to the second input of the drive regulator and with the first input of the regulator of water supply to the mill, a classifier discharge size sensor connected to the regulator of water supply to the classifier, a water flow meter to the mill, connected to the second input of the regulator of water supply to the mill, and the water flow meter to the classifier, distinguished by the fact that, in order to improve control accuracy, the system is equipped with a regulator for correcting the flow of water into the mill. and a third signal multiplier, the second output of the first signal multiplier connected to the first input of the regulator for adjusting the water supply to the mill, and the flow meter § water to the classifier is connected to the third signal multiplier, the output of which is connected to the third input of the feeder drive controller and to the second input of the feed correction controller water to the mill, the output of which is connected to the third input of the water supply regulator in the mill. ω (Ζ to CD 00 SP