SU604579A1 - Method of automatic control of single-stage wet disintegration process - Google Patents

Description

one

The invention relates to the IK of the field of automatic control of technological processes of boiling, or rather, the methods of automatic control of the process of grinding ore in a ball mill operating in a closed loop with a spiral classifier, and can be used in the processing plants of non-ferrous and ferrous metallurgy that have similar cycles of processing raw materials .

There is a method of automatically / regulating the process of grinding ore in a mill, working in conjunction with a classifier.

However, this method, which is inclusive in maintaining the ore to water ratio and the stabilization / size of the classifier drain, does not provide a high performance.

The closest to the present invention is a method for automatically controlling the one-stage wet grinding cycle, which includes controlling the weight flow of ore and water flow at the inlet IB ball mill with the correction of ore consumption according to the value of the circulating load determined by integrating the difference in the weight of ore at the input of the mill and solid phase. on the discharge classifier 2.

The disadvantage of this method is the impossibility of achieving the maximum performance of the finished product of a given class with changing physicomechanical characteristics of the raw material.

This is due to the fact that the regulation by a known method does not maintain the optimum density of the puls in the mill, which corresponds to the quality of the ore being processed, and also does not take into account the significant delay in the response of the circulating load to the disturbance in the original feed.

The purpose of the invention is to increase control accuracy.

It is achieved there that in the method of automatic control of a single-stage wet-grinding cycle, including regulation of the ore weight consumption and water consumption at the ball mill inlet with correction of ore consumption by the value of circulating nalrueki, determined by integrating the difference of ore weight by ore into the mill input and solid phases on the discharge of the classifier, additionally measure the weight flow rate of the finished class on the ball mill and classifier discharge and the water flow rate into the classifier and determine the difference in weight Outflows of the finished product at the ball mill and classifier discharges and the sum of the ore consumption and circulating load, regulate the water flow in the classifier in proportion to the difference in the finished product weight weights at the maiposow mill discharger and classifier, and in the process of adjusting the weight flow 1ruda and water consumption At the entrance to the ball mill, the water consumption is corrected in the proportion of the weight of ore and the cyclic load and the difference in the weight of the finished product on ball mill and classifier plums and ore consumption at the entrance to the ball mill is proportional to the difference in weight of finished product on ball mill and classifier plums. In addition, the weight difference (cost of the finished product at the ball mill and classifier discharge is determined taking into account the classifier lag time.

The drawing shows a block diagram of a device for carrying out the proposed method.

The device contains an ore consumption sensor 1, secondary devices 2-7, controllers 8-10, control unit 11, power supply drive motor 12, diaphragms 13 and 14, differential pressure gauges 15 and. 16, actuators 17 and 18, -regulated valves 19 and 20, gauges 21 and 22 size, st1 (unit 23 for measuring the solids weight flow at the classifier discharge, multiplier blocks 24 and 25, unit 26 for recording time of the multiplier and classifier, multipliers 27 -30 signals, adder 31, integrator 32, blocks 33 and 34 of subtraction.

The grinding complex is a ball mill 35, operating in a closed loop with a classifier 36.

The method is carried out as follows.

When the physicomechanical properties of the original ore change, for example, the weight consumption of the finished class at the ball mill discharge and the classifier discharge increases, which leads to an increase in circulating load and a change in the weight difference of the finished class at the ball mill dumpers and the classifier. In proportion to the change in the circulating load, the ore consumption in the ball mill is reduced. In proportion to the total ore load, the flow of water into the mill is controlled, maintaining the water-to-ore ratio. In proportion to the change in the difference of the weight quantities of the finished class, the water flow rate in the classifier changes, which leads to a change in the circulating load. In order to introduce timely corrective correction, additional consumption of ore and water in the mill is proportional to the difference in the weight of the finished product on the meliynits plums and the classifier.

The weight quantity of the finished class at the discharge of the classifier 36 is determined by multiplying in multiplication unit 24, si, the signals from the secondary devices 6 and 7 of the device 23 for measuring the flow rate of the solid phase by

discharge of the classifier and sensor 22 of the validity, tared for the maintenance of the finished class The weight quantity of the finished class at the discharge of the mill 35 is determined by multiplying in block 25 the multiplication of the signal of the secondary device 4 of the sensor 21, the size of the discharge of the mill 1 and the sitnal from the adder 31, which summarizes the signals from the secondary device 2 of the sensor 1 of ore consumption 1 and the signal

from integrator 32, proportional to the circulating load, which is determined by integrating IB into the block 32 of the signal difference from the secondary devices 2 and 6 entering the subtractor 34. The correction signal from the block 33 of the subtraction through the signal multiplier 29 enters and the controllers 8, 9 and 10 control the flow of ore and water into the mill and water into the classifier. The correction signal from the integrator 32 through the multiplier 28 signals goes to the regulator 8. The correction signal from the adder 31 through the multiplier 30 signals enters the regulator 9.

Claims (2)

1. A method for automatic control of a one-step wet grinding cycle, including the regulation of the ore weight flow and the flow rate of the water at the entrance to the ball a mill with a correction of ore consumption by the value of circulating load, determined by integrating the difference in the weight of ore at the mill inlet and the solid phase at the discharge of the classifier, characterized in that, in order to improve the control accuracy, the weight flow of the finished class is additionally measured on the ball plums ( Mills and classifier and water consumption in the classifier and determine the difference in the weight of the finished product on the plums ball ball and classifier and the sum of the weight of ore and circulating on manual ultrasonic inspection, performed by flow regulation in the qualifier proportional to the difference in the weight of the finished product at the ball mill and classifier drains, and in the process of adjusting the weight flow of the ore and the water flow at the entrance to the ball mill, the water flow is adjusted proportionally to the sum of the ore weight and circulating load and the difference in weight of the finished product at the drains Sharoe mill "classifier and correction The ore consumption at the inlet IB of the ball mill is proportional to the difference in the weight of the finished product at the discharge of the ball mill and the classifier. V 2. The method according to claim 1, wherein that the difference in the weight of the finished product on the ball mill and classifier discharge is determined taking into account the classifier lag time. Information sources, (IBO received attention during examination 1. For the number 2352855, cl. In 02С 25/00, 1976, according to which a decision was made to issue an author's certificate of the USSR. 2. USSR author's certificate No. 50E592, cl. B, 02C 25/00, 1976.