SU1567275A1 - Method of automatic controlling of multioperation process of flotation - Google Patents

Abstract

The invention relates to the automation of flotation beneficiation processes and can be used in the processing plants of non-ferrous and ferrous metallurgy. The purpose of the invention is to improve the accuracy of process control by taking into account the unevenness of the influence of the flow of foam products / PP / each process operation on the resulting PP. To do this, measure the thickness of the foam layer, the content of useful components (PC) and the consumption of solid (PT) in PP by the flotation process operations. Measure RT in the resultant PP and its deviation from the set. The content of PC in PC is measured for each operation and the resulting PC as the product of PC content in PC on RT in it. The coefficient of the relative value of the PP of each operation is determined as the ratio of the content of the PC in the PP of each operation to the content of the PC in the resulting PP. Adjusting the task for the pulp level in operations is inversely proportional to the found values of the coefficients of the relative value of the PP operations with a positive deviation of solid flow in the resulting PP from the specified and directly proportional with a negative deviation of the latter. 1 il.

Description

(21) 4453832 / 25-03

(22) 07.06.88

(46) 05.30.90. Bul Number 20

(71) Alma-Ata design bureau of automated control systems of the Kazakh Scientific Production Association System Engineering

(72) V.I.Toporov, A.S.Gladky, L.A. Barsky, Kh.H.Muslimov

and Yu.P. Grigoriev

(53) 622.765 (088.8)

(56) USSR Author's Certificate No. 738670, cl. In 03 D 1/02, 1980.

USSR author's certificate number 1036382, cl. At 03 D 1/00, 1983.

(54) METHOD FOR AUTOMATIC CONTROL OF THE MULTI-OPERATIONAL FLOTATION PROCESS

(57) The invention relates to the automation of flotation beneficiation processes and can be used in concentrating plants of non-ferrous and ferrous metallurgy. The purpose of the invention is to improve the accuracy of the control.

The aim of the invention is to improve the accuracy of process control by taking into account the unevenness of the effect of the flow of foam products of each process operation on the resulting foam product.

laziness by taking into account the unevenness of the influence of the flow of foam products (NP) of each operation of the process on the resulting PP. To do this, measure the thickness of the foam layer, the content of useful components (PC) and the consumption of solid (PT) in PP according to the operations of the flotation process. Measure RT in the resultant PP and its deviation from the set. The content of PC in PC is measured for each operation and the resulting PC as the product of PC content in PC on RT in it. The coefficient of the relative value of the PP of each operation is determined as the ratio of the content of the PC in the PP of each operation to the content of the PC in the resulting PP. Adjusting the task for the pulp level in operations is inversely proportional to the found values of the coefficients of the relative value of the PP operations with a positive deviation of solid flow in the resulting PP from the specified and directly proportional with a negative deviation of the latter. 1 il.

The drawing shows a block diagram of a system for automatically controlling the flotation process with which this method is carried out.

The method consists in measuring the thickness of the foam layer, the content of useful components and the consumption of solids in foam products according to the operations of the flotation process, regulate the level of pulp in operations, measure the consumption of solids resulting in

$

(L

ate

P j

you ate

foam product and its deviation from the specified, determine the number of useful components in the foam products of each operation and the resulting foam product as the product of the number of useful components in the foam product to the solid consumption in it, determine the ratio of the relative value of the foam product of each operation as the ratio of useful components in the foam product of each operation to the number of useful components in the resulting foam product and correct the task for the level of the pulp in the opera This is inversely proportional to the found values of the coefficients of the relative value of foam

5672754

9 pulp level regulators in the operations of FM1, FM2 ..., FMN, unit 10 of the formation of basic tasks for regulators 9 of the pulp level in operations of FM1, FM2 ..., FMM, block 11 of the formation of corrective actions on the regulators 9 pulp level in each of the operations of the FM1, FM2, ..., ..., OMN.

The operations of the process implemented on the flotation machines FM1, FM2, ..., FME are connected in series, which takes place in almost all technological schemes for flotation of polymetallic ores, including collective flotation cycles, control operations, etc.

The outputs of the sensor 1 layer thickness pe10

25

thirty

35

when the operations are positive, the operations in the operations are connected to the inputs of the cloning of the solid flow in the resulting frothy product from the task and directly proportional to the negative deviation of the latter.

Example. The system includes a control facility for flotation operations of machines FM1, FM2 ... FM, sensors 1 connected to them, thickness of the foam layer in operations, sensors 2 contents of useful components (metals) in the foam products of operations FM1, FM2, ... , FMM, sensor 3 contents of useful components (metals) in the resultant (total) foam product, sensors 4 consumption of solids in the foam products of operations FM1, FM2, ..., FMN, sensor e consumption of solids in the resultant (total) foamy product.

Sensors 2 and 4 are installed at the exit from the operations of the FM1, FM2, ..., FMA flotation machines. Sensors 3 and 5 are installed at the outlet of the tank (shown conventionally as a segment of a dedicated line) in which the foam products of the FM1, FM2, ..., flotation machines-FMT are combined to form the resulting (total) foamy product.

 The system also includes a block 6 for calculating the deviation of the current value of the solid flow in the resulting foam product from the target, block 7 for determining the number of useful components in the foam products of operations FM1, FM2, ..., FMK and for the resulting foam product, block 8 for calculating the coefficients the relative value of the foam product of each operation,

40

45

50

55

unit 10 of the formation of basic tasks associated with the unit regulator 9 level pulp in operations.

The signals from the sensors of the contents of the useful components in the foam product operations, the content of useful components in the resulting foam product, the consumption of solid in the foamy products, the consumption of solid In the resulting foam product 2-5, respectively, are fed to the inputs of block 7 for determining the number of field components in foam products of operations and in the resulting foam product, which, through block 8 for calculating the coefficients of the relative value of the foam product of each operation, is connected with block 11 to form corrective x influences the pulp level 9 regulators in operations.

The unit 6 for calculating the deviation of the current value of the solid flow rate in the resulting frothy product from the target value is connected to the sensor 5, which measures the current solid flow rate values in the resulting frothy product, as well as to the unit 11 for generating corrective actions, the signals from which, in turn, arrive at inputs of regulators of 9 levels of pulp.

The system for automatic control of the flotation process works as follows.

In certain cells of the microcomputer memory, along with the programs, the values of the following fixed parameters provided in advance are placed in the form of digital codes.

five

0

five

0 us in operations connected to inputs

0

five

0

five

unit 10 of the formation of basic tasks associated with the unit regulators 9 level pulp in operations.

The signals from the sensors of the content of useful components in the foam products of the operations, the content of useful components in the resulting foam product, the consumption of solid in the foam products of operations, the consumption of solid In the resulting foamy product 2-5, respectively, are fed to the inputs of the unit 7 for determining the number of useful components in foam products and operations in the resulting frothy product, which, through block 8 for calculating the coefficients of the relative value of the frothy product of each of the operations, is associated with block 11 of forming a corre effects on the level 9 pulp regulators in operations.

The unit 6 for calculating the deviation of the current solid flow rate in the resulting frothy product from the predetermined value is connected to the sensor 5, which measures the current solid flow rate values in the resulting frothy product, as well as to the unit 11 for generating corrective actions, the signals from which, in turn, arrive at the inputs regulators of pulp level 9.

The system for automatic control of the flotation process works as follows.

In certain cells of the microcomputer memory, along with the programs, the values of the following fixed parameters provided in advance are placed in the form of digital codes.

the technological board of the flotation process: the level of the drain threshold of the C fleet of machines in operation; the coefficient K, which takes into account the degree of mineralization of the foam by its thickness and determines the necessary degree of foam removal in the flotation machine; dead zone about, determining the accuracy of stabilization of solid flow at the exit of the flotation process; task value

AT

Y1 on the consumption of solid, as well as the value of the choice of a particular law of regulation (for example, PI, PID)

C L2

The input of the head operation flotation machines, for example FM1, serves the source power (pulp).

In the enrichment process, the chamber product of each of the previous operations enters the inlet of each subsequent, in particular, from FM1 to the input of FM2, etc., and the enriched (foamy) product from each operation merges into a common container, forming the resulting foamy product in it.

The sensors 1, which control the thickness of the foam in the FM1, FM2, ..., FMM flotation machines, generate signals that are received alternately from each of the flotation machines in the pulp level formation unit 10 of the flotation machines.

In accordance with the signals from sensors 1 characterizing the thickness of the foam layer in each of the flotation machines, in block 10 of the formation of basic tasks, the values of the basic tasks are calculated from the pulp level in flotation machines as follows:

h; WITH; - K; -H;, (1)

about where h is the basic task by level

pulp of the i-th flotation machine;

Cj is the drain threshold level of the i-th flotation machine;

H | - the thickness of the foam layer in the 1st flotomachine;

K- - coefficient taking into account

the degree of mineralization of the foam by its thickness and determining the required degree of foam removal in the i-th flotation machine; i 1, N (where N is the number of flotation machines in the cascade). The obtained values of the basic tasks h. on the level of pulp in floto10

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machines from block 10 are fed to regulators 9 to maintain the level of pulp in each of the flotation machines in accordance with the assignment.

 Sensors 2 and 3 measure the content of useful components (metals) in the foam products of each of the flotation machines and in the resulting froth product, respectively, and in sensors 4 and 5, the consumption of solids in the foam products of each of the flotation machines and in the resulting foam product.

The signals from all of these sensors are pos. 5 blunt inputs to block 7, in which the amount of useful components in the froth product of each of the flotation machines and in the resulting froth product is determined.

20 QM | Cm; y . (QMr Ug- for the resulting foam product),

(2)

five

where q. - number of useful components i

nentsy in the froth product of the i-th flotation machine; Cm; - the content of useful components in the froth product of the i-th flotation machine;

Q Y - consumption of solid in the froth product of the i-th flotation machine. The calculated values of the quantity of useful components in the foam product of each of the flotation machines Q m; and in the resultant foam product, Q mg is transferred to the input of the block 8 for calculating the relative values of the foam product of each of the flotation machines.

In this block, the calculation of the coefficients

0

performed as follows:

P: .

(3)

: m

where is P; - coefficient of the relative value of the froth product of the i-th flotation machine;

Q is the number of useful components in the froth product of the i-th flotation machine;

: mg

- number of useful components

nentsy in the resulting foam product.

The coefficients in block 8 are calculated to assess the role of each of the flotation machines in the formation of the resulting frothy product.

The obtained values of the coefficients from block 8 are fed to the input

unit 11 for the formation of corrective actions on regulators of 9 levels of pulp in flotation machines.

When using a cascade of flotation machines, a change in the volume flow rate of the pulp entering the head flotation machine (for example, FM1) leads to fluctuations in the pulp level both in it and in subsequent flotation machines (FM2, ..., FMN).

These fluctuations cause a change in the volume flow rates of the output products of the flotation limit, which significantly affects the stability of the technical and economic indicators and, consequently, leads to a deterioration in the quality of the frothy product.

The impact on any of the flotation machines of various disturbances (for example, when the volume flow rate of the pulp at the inlet of FM1 changes, the total consumption of the froth product at the output of the flotation unit changes) leads to a deviation of the solid flow in the resulting frothy product from the task.

To ensure a stable volume flow rate of frothy product at the output of the flotation processing, the flow rate of solid in the resulting froth product is constantly measured by the sensor 5, the signals from which simultaneously with the flow into unit 7 also flow into unit 6 for calculating the deviation of the current value of the flow rate of solid in the resulting frothy product from .

In block 6, the deviation of the current solid consumption value in the resulting frothy product from the specified value is calculated as follows:

-1Ј, (4)

where V is the consumption of solid in the resultant foam product; V is a task for solid flow (it was previously entered in accordance with the flow chart). The found deviation value D is also transmitted to the input of the block 11 for the formation of corrective actions on the regulators 9 of the pulp level in flotation machines.

In block 11, the formation of corrective actions on the signals from blocks 8 and 6c in order to stabilize the flow of solid in the resulting

The foam product is adjusted to set the metering of the FM1, FM2, ..., FMK foam machines.

In connection with a decrease in the degree of saturation of the frothy product with useful components along the front of a cascade of operations, the influence of each of them on the content of useful components in

the resulting frothy product is not the same.

In order to increase the content of useful components (metals) in the resulting froth product, stabilization

solid flow at the output of the cascade of operations, i.e. in the resulting frothy product, is provided by forming corrective actions on the level 9 regulators of the pulp

in operations as follows:

Ah; YJ-, W at A / $;

25 ub; n; .L2 (for d Ј |

(five)

Ah, Oh

at / D | IS,

five

0

where DL is the corrective action

to the controller of the 9th level of the pulp of the i-th operation;

P - coefficient of the relative value of the froth product of the i-th operation;

C, L- - operators defining the laws of regulation (for example, PI, PID); b - dead zone,

determining the accuracy of stabilization of solid flow at the process output.

From the expression (5) it follows that with a positive deviation D, the calculation of corrective actions is inversely proportional to the coefficient P of the relative value of the frothy product of each operation, and with a negative deviation D - directly proportional to the coefficient II.

„If the deviation is D

the absolute value does not exceed the value of the given dead zone 5; the calculation of corrective actions on the regulator 9 is not performed. From block 11, the magnitude of the corrective action Yes; is transmitted to the input of the regulator 9, in which the total value of the task is determined by the level of the ith i-th operation

h - b + uh ;,

(6

where h, is the basic task of the pulp level of the 1st operation;

Dp - corrective task for

pulp levels of i-th operation

Thus, according to the signals from blocks 10 and 11, the regulators 9 maintain a predetermined level of pulp in operations.

The use of the invention makes it possible to more effectively control the flotation process and significantly improve the technical and economic indicators of the flotation process by increasing the content of useful components in the froth products of flotation processing areas, which are stages of flotation operations.

Claims (1)

Invention Formula A method for automatically controlling a multi-stage flotation process based on measuring the thickness of the foam layer, the content of complete components and the consumption of solid in Hbixt foam products by the operations of the flotation process and adjusting the level of bullets . - ten 156727510 Operational steps, which, in order to increase the accuracy of process control by taking into account the unevenness of the effect of the froth product flows of each operation on the resulting froth product, measure the solid flow rate in the resulting frothy product and its deviation from the specified the number of useful components in the foam products of each of the operations in the resulting foam product as the product of the content of useful components in the foam product and the consumption of solid in it, determine the coefficient relative to value of the foam product of each operation as the ratio of the amount of useful components in the foam product of each operation to the number of useful components in the foam product and corrects the pulp level in operations inversely proportional to the values found and the relative values of the foam products of operations with a positive deviation of solid flow in the resulting foam product from the given and directly proportional to the negative deviation of the latter. 15 20 25 thirty