SU1344412A1 - Method of automatic control of water supply to grinding cycle - Google Patents

Abstract

The invention relates to the field of automatic control and regulation of the processes of wet grinding of ores. Designed for use primarily in concentrators. Allows to improve the quality of regulation. To achieve this goal, the ore-containing water consumption, its density, ore density are measured, the mass flow of ore and the content of pure ore in ore-containing water are calculated, the ore flow is changed depending on the mass flow of ore and pure water in ore-containing water and change the flow of pure water depending on the content of pure water in ore-containing water, measure the flow rate of ore, change the flow rate of ore-containing water and its volume flow, and change the flow rate of ore-containing water in depending on the ratio of the mass flow of ore in water to rudosoderzhaschey ore flow, and the change of volume flow of water rudosoderzhaschey carried out at prevsch enii ratio of mass flow of ore in water to rudosoderzhaschey ore flow setpoint. 2 Il. (L 00 4: 4 4

Description

one

This invention relates to the automatic control and regulation of wet ore grinding processes. Designed for use primarily in concentrators.

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

Figure 1 shows a graph of the extraction of size classes into the drain of a classifier (curve I - with normal feed-unloading of the mill, curve II - with material - washing waters. The area between these curves is the possible values of the function when working on a mixed material); 2 is a block diagram of a control system implementing the method.

The grinding unit (mill-classifier) works stably in a certain range of deviations from curve 1 (hatched), then the characteristics of the output product of the cycle are disturbed by the composition.

The block diagram of the regulation system (FIG. 2) includes a flowmeter 1 of ore-containing water, a density meter 2, an ore density sensor 3, an ore mass flow sensor 4, secondary devices 5–8, a computing unit 9, a water consumption regulator 10, a regulator II ore consumption, mass flow controller 12 solid in ore-containing water, actuators 13-15, working bodies 16-18.

The system works as follows.

From the flow meter 1, the density meter 2, the density sensor 3, the mass flow sensor 4 through the secondary devices 5-8, the computing unit 9 receives signals corresponding to the measured parameters. Computing unit 9 determines the mass flow rate of ore in ore-containing water using the formula

G .. p (n-O. where Ate is solid density; V is volume flow of ore-containing water; / Zr is its density, as well as the content of pure water in ore-containing water according to the formula

BUT

 VP TS

/ :,

In addition, the ratio of ore to the belt feeder is calculated.

where Q p mass flow

ten

15

20

25

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The signal corresponding to the ore fines mass consumption is fed to the input of the ore consumption regulator I1 to adjust the setpoint in order to stabilize the total ore consumption per cycle, the signal corresponding to the pure water content (water cut) is fed to the input of the water consumption regulator 10 to correct the setpoint on degree of sloughiness.

In the event that the calculated G / Q ratio deviates from the specified range from the computing unit 9, a signal is fed to the input of the controller 12, which is H3MeHHef ore fines washing intensity.

If the range of regulation of the regulator 12 is reduced to reduce the intensity of mine washing, a signal is sent from the output of the regulator to a change in the distribution of the volume of the ore-containing water in the grinding aggregates.

The intensity of washing ore fines can be changed, for example, by adjusting the pressure of the washing water at the screen, or by adjusting the frequency of its vibration, etc. As other means of automation used in the system, standard instruments and devices can serve.

The method allows to order the content of ore fines in the wash (circulating) waters by adjusting the intensity of ore washing in accordance with the capabilities of the grinding cycle, and thus increase the stability of the parameters of the output of the grinding unit.

If it is impossible to limit the intensity of ore washing due to technological features, the proposed method allows to distribute the flow of ore-containing water to other grinding units.

The method allows a 30% increase in the stability and reliability of the regulation by the wet grinding cycle.

Claims (1)

Invention Formula A method for automatically controlling the supply of water to the grinding cycle, including measuring the flow rate of ore-containing water, its density, ore density, calculating the mass flow rate of ore and the content of pure water in ore-containing water, changing the flow 35 40 45 50 55 ores in tannsimon from the mass consumption of ore and pure water in ore-containing water and the change in the supply of pure water depending on the content of pure water in ore-containing water, characterized in that, in order to improve the quality of regulation, ore consumption is measured, the intensity is changed supply of ore-containing water and its volume consumption, with, dfff. 1.0 how the change in the intensity of ore-containing water supply is made depending on the ratio of ore mass consumption in ore-containing water to ore consumption, and the change in volumetric flow rate of ore-containing water is performed by increasing the ratio of ore mass consumption in ore-containing water to ore consumption of a given value. / / CHA . FI.2 Compiled by V.Alekperov Editor N.Gorvat Tehred M.Hodanich Order 4873/8 Circulation 572Subscription VNIIPI USSR State Committee for inventions and discoveries I13035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4 Proofreader M. Demchik