SU778797A1 - Method of automatic control of wet disintegrating process in the mill operating in closed cycle and having classifying apparatus - Google Patents

Description

cic characteristics of the feedstock. This is due to the fact that during regulation the pulp density in the mill is not maintained that is consistent with the quality of the ore being processed, since the flow of water into the mill is maintained on-one, pre-selected at the selected level) which does not take into account the redistribution between the original ore and the circulating load when the specified level is reached mill fillings.

A significant disadvantage is that in the known method the prediction of the size of the classifier draining by changing the signals of the load sensor, the flow sensor and the density sensor of the finished product is carried out. However, the forecast on the readings of only these sensors is imperfect, since the error due to wear of the trunks and linings, the neglect of changes in pulp density in the mill, and the neglect of the changing structural texture characteristics of the ore being crushed is not taken into account.

The purpose of the invention is to increase productivity and eliminate the possibility of emergency situations.

This goal is achieved by the fact that in the method of automatic control of the wet grinding process. in a mill operating in a closed cycle with a classifying apparatus, including measuring the degree of filling of the mill with raw material, flow rate of water into the mill and into the classifying apparatus, density and size of the finished product at the discharge of the classifying apparatus, stabilizing the degree of filling of the mill with final material at the specified value, stabilization of pulp density at a given value and stabilization of water flow to the classifying apparatus with restriction of its flow to a specified value, with correction, proportional to The specific difference between the measured size of the finished product and the specified, the specific gravity of the solid is measured, in the process of stabilizing the density of the pulp, a correction is made proportional to the difference between the density of the finished product at the discharge of the grading apparatus and the specified value, and the specified density and the size of the finished product at the discharge of the classifying apparatus and the specified value of the flow rate of the source material in the mill is adjusted according to the specific gravity value about.

The drawing shows a device for implementing the method.

The device contains a weight measuring device 1 for ore consumption, a filling sensor 2, secondary 3 and 4, block 5 for determining the optimal ore consumption per mill; controller 6, drive control unit 7 of the drive 8, water flow meter 9, secondary device 10, controller 11, actuator 12, valve 13, pulp parameters analysis device 14, including pulp density determination units 15, size 16, specific gravity of solid 17 ; secondary devices 18 and

19, the elements 2O and 21 of the comparison, the controller 22, the water flow meter 23, the secondary device 24, the actuator 25 of the electric valve 26, the block corrector 27.,

Grinding complex consists of a ball drum mill 28, operating in a closed loop with a classifying apparatus 29.

Blocks 1-8 constitute the mill fill stabilization circuit; blocks 9-13 - contour stabilization of water flow in the mill; blocks 23-26 - a contour for regulating the flow of water into classification devices; blocks 16, 19,

20,22, 25, 26, 27 - contour stabilization of the size of the finished product discharge classifier apparatus; blocks 15, 18, 20, 27, 11, 12, 13 contour correction flow of water in the mill; blocks 27, 17 - contour correction of the specified values of density and particle size of the discharge of the classifying apparatus.

Managing the process of wet measurement of the process / process, affecting. Roads of ore and water in a ball mill and water consumption in 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.

Stabilizing circuit. Mill ore supports it in these limits by changing the ore consumption in the mill, affecting the drive motor 8 feeder. In block 5, an optimum ore consumption signal is generated in the mill based on signals from weight gauge 1 and fill sensor 2, which are fed to the input of block 5 through secondary devices 3 and 4.

Each type of ore and the state of the mill corresponds to a precisely defined filling of the mill with ore and sand of the classifier and a precisely determined volume ore consumption. When changing the type of ore, for example, in the direction of shrinking, the specific gravity of the solid, which is crushed, and the contour of maintaining the optimum load, are measured.

a mill changes ore consumption to a mill.

When the specific gravity of the ore changes, the discovery, the content of the useful component, closely correlated with it, changes. Therefore, it is necessary to bring in accordance with the type of ore the specified values of particle size and density,

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the production of grinding and restrictions imposed by subsequent enrichment stages.

When the physicomechanical properties of the original ore change, for example, during the transition from solid to soft ores, the content of the finished product in the discharge of the classifier and the productivity of the finished product increase. The difference signal from the element 21, measured by block 16 through the secondary device 19 and specified by the corrector 27, the size of the product in the discharge of the classifier, enters the regulator 22, which changes the water flow through the blocks 25 and 26 into the classifier in the direction of the restored CIRCLE. Due to the change in the flow rate of water into the drain of the classifier, the pulp density, controlled by unit 15, and the circulating load, are burned. The controller b, by processing the signal from block 5 through block 7 and drive 8, increases the performance of the original power supply.

If the water consumption in the mill is kept constant, the density in the grinding zone will increase, as a consequence of this, the amount of material transported through the mill will increase and the ore can be reduced. This will adversely affect the subsequent stages of enrichment. In order to introduce timely corrections for changes in the size of the classifier and the circulation of the load signal Signs1) Element 20, the proportional gap measured by block 15 and the density specified from block 27 goes to the regulator 11, increasing the water flow to the mill. This stabilizes the operation of the crushing OKLTX. And the productivity is improved both by the PW feed and by the weight output of the finished product. It does not allow the overmixing of the original ore.

To maintain the mode of operation of the grinding complex and to achieve the maximum possible productivity for this type of ore, block 27 generates a correction signal 5 according to the signal CH5 of block 17..

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Claims (2)

1. USSR author's certificate number 535101., cl. B 02 C 25/00, 1976 ,. 0 2. Authors certificate of the USSR 507359, cl. B 02 C 25/00, 1974.