SU1590138A1 - Method of automatic control of closed cycles of wet grinding - Google Patents

Abstract

The invention relates to the automation of wet grinding processes, can be used in the construction and metallurgical industries and can improve the quality of control. To achieve this goal, stabilize the ore consumption in the mill, change the flow of water into the mill and the classification depending on the sand load, change the flow of water in the sump and adjust the flow of water into the mill according to the density of the finished product at the discharge of the hydrocyclone and correct the desired density of the finished product when the measured pulp level in the hydrocyclone sump reaches its maximum permissible level. 2 Il.

Description

The invention relates to the automatic control of wet grinding processes in drum mills with classifying apparatus in the ferrous and ferrous metallurgy and chemical industries.

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

FIG. 1 is a schematic diagram of a control system for implementing the method; in fig. 2 - dependence of Q (Rdgts) flow rate B, ode to the spiral classifier O g on the flow rate of the baud to the sump of the hydrocyclone

Q and the dependence / Sd.7, -v.gi. the stroke of the control size class (-71 microns) in the finished product at the discharge of a hydrocyclone / 3.-, from the water consumption

in the hydrocyclone sump with stabilization of the sand load of the spiral classifier Q „., and the density of the drain hydi7i CL

rociklon HZ at the maximum allowable level of pulp in the sump Hj. The scheme (Fig. 1) contains a system (stabilization of the feed of the original ore to the mill 1, which contains the setting unit 2 and the ore consumption sensor 3, the regulating device 4 and the actuator 5 supply the 1st channel, the system for controlling the flow of water to the mill, which contains the actuator 6 variable valve with a regulating device 7, the input of which receives signals from the sensor 3 ore consumption, sensor 8 current drive spirals classifier 9 and sensor 10

tightness of the finished product at the discharge of a hydro-clone 11, a system for controlling the flow of water into a spiral classifier, which contains an actuator 12 of an adjustable valve with a regulating device 13 according to a signal from the sensor 8 of the actuator of the spirals of the regulator cn, consisting of a density adjusting device 14, a density sensor 10, a pulp level sensor 15 in the sump 16 of a hydrocyclone 11, a regulating device 17 and an actuator 18 of an adjustable valve.

The essence of the method is as follows.

When changing the grindability of the original ore or its density from: the amount of product in the discharge and sands of both the classifier and the hydrocyclone changes, and the water flow to the mill, the classifier and hydrocyclone changes accordingly. At the same time, the ruling device 7 generates such an effect on the executive mechanism for supplying water to the mill, which ensures the maintenance of a constant optimal pulp density in the mill when the volumes of the sand load of the k-cyclone classifier are changed. The regulating device 13 for supplying water to the classifier produces such an effect that maintains the maximum sand load permissible for the normal operation of the spirals of the classifier, since only at the maximum sand load of the classifier does the greatest efficiency of the grinding process in the mill achieve, the controller 17 independently of the other counter systems - l maintains a predetermined density of the finished product in the discharge of a hydro cyclone and simultaneously monitors the level of the pulp in the zoom Fairies. In this case, if the pulp level in the sump reaches a maximum permissible value, the regulating device 17 stops the commands to increase the water supply to the hydrocyclone, and if the maximum level is exceeded, it reduces the water supply to the hydrocyclone.

The results of the operation of independent regulators of water supply to the classifier and hydrocyclone sump obtained for the current grinding cycle (Fig. 2 shows that the method ensures that the grinding cycle is operated in the optimal mode with the maximum possible output of the control size (-71 µm) in the finished product on the sink hydrocyclone and is determined by point A.

The method allows to provide an increase in the quality of control and to avoid overflow of the hydrocyclone sump

pulp.

Claims (1)

Invention Formula A method of automatic control of a closed cycle of wet grinding with the classification of the crushed product sequentially in the spiral classifier and hydrocyclone, including measuring the ore consumption per mill and peskovoy load classifier, stabilizing the ore consumption per mill, changing the flow rate of water in the mill and the classification depending on the classifier sand load and change in water flow in the sump, characterized in that, in order to improve the quality of control, the density of the finished product is measured at the hydro cyclone and the pulp level in the hydro cyclone sump compare the density of the finished product at the hydrocyclone discharge with a given density and correct the flow of water into the mill and the set density of the finished product, and the change in the flow of water into the sump and the correction of the flow of water into the mill proportionally the difference between the density of the finished product is discharged from the hydrocyclone and the given density, and the correction of the specified capacity of the finished product is carried out when the measured pulp level in the sump At the maximum allowable level. OV.kl munnn io cml m 9uiZ