SU757195A1 - Flotation process control method - Google Patents

Description

The invention relates to the beneficiation of minerals and can be used for automatic control of the flotation process.

Known control method pro- - ⁵ EUCES flotation, comprising changing the amount of control - dosage levels and flotation reagents for the input flow of the product, the metal content in the input ^and the output and SG products (concentrates and tails), as well as indirect parameters · size, density and alkalinity of products and other £ ΐ].

The magnitudes of the control actions 15 are calculated using regressive or expert estimates obtained by the methods of expert estimates.

and = ί (ς, οΐ, β, ν, С, <У, Р),

where and - vector of control actions;

C - the amount of input product;

θ (, β, ν - the vectors of the metal content in the input product,

concentrates and tails; C, C?, P are the vectors of indirect parameters of size, density, and. alkalinity, respectively.

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25

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The known method is characterized by not high performance indicators and control accuracy, since it does not take into account the costs of output and intermediate products, without which you can not achieve the required performance.

There is also known a method of controlling the flotation process on the change in the consumption of reagents for the consumption of the initial feed, the content of useful components in the initial and final products £ 2].

This method slightly increases the efficiency and accuracy of flotation process control, as it does not allow for the input flow and output flow rates and the metal content in them to be allocated due to the technological scheme of control actions with the flow rates of intermediate products and the flow rates of metals in them.

The purpose of the invention is to increase the efficiency and accuracy of control.

This goal is achieved by the fact that they form a measurement interval, measure the consumption of recoverable metals and non-recoverable rock in intermediate products on a dedicated interval 757195

After measurement, the total consumption of components in intermediate products is determined and the control actions are measured taking into account the value found.

The drawing shows a block diagram of an automatic process control system Flotation that implements the proposed method.

It contains indirect parameters sensors 1, an instrument 2 controlling the input product flow rate, a device 3 for measuring the contents in the input product, intermediate products 4, tails 5 and concentrates 6, respectively, actuators 7 for dispensing reagents and changing flotation machine levels, computing device 8 for calculating estimates of the cost of metals, the control device 9, the device 10 correction factors for indirect parameters.

The operation of the control system is as follows.

The device 10 sequentially polls the sensors of indirect parameters and calculates the coefficients

according to dependencies [2] and the values of control actions existing at the moment. The obtained values of the coefficients are transmitted to the computing device 8, which, after entering the flow and contents from the devices 2-6, calculates the costs of metals and non-recoverable rock in all products.

The calculated costs and coefficients are entered into the control device 9, which calculates the values of the dosages of reagents and the levels of flotation machines and transfers them to the actuating devices 7.

The model has the form

ten

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χη (ι * ι

Where

k-, £ (1, 2 = 1,2 ...

: o + c (c

(one)

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with this, directly dependent on control actions and implicitly on indirect parameters and, which corresponds to their representation in the form

^a <| =%) ^(B y- ^and 1> - = a ,. (b ^, i-), (2)

where are the coefficients in relations (2), showing the influence of the effects and; on the coefficients, depending on the values of indirect parameters.

The costs are determined by one of the state estimation methods for this model and the observation equations that look like

* 1 ^{(ί) = Χ} φΙ < ^{ΐ) +} · · - ^{+ X} 4тм (Н + ^ (1) ·,

(ΐ) + ... + X

ι t + A

(ΐ)

(ι);

1 = 1.2 ..... η,] = 1, 2,. . . , t,

where 9 ^ (1), 4- (1) are the measured values of the input product consumption and the metal content of the products, respectively;

^ 4 (1), 4 -,) (1) - measurement errors. Calculation of control actions

produced by current and prior cost estimates Χ · (ι) using an algorithm of the form

9 (1) = 4 (^ (1), X (1-1) ..... X (1-g), b,

L *

where X (ι) is the vector of estimates of all expenses;

ϋ (1) is the vector of all control actions;

I is the transformation operator obtained by well-known methods of control theory from model (1) and dependencies (2) with allowance for constraints and efficiency criterion.

.., η), ί = 1, 2.. . , η,] =

, t + 1,

- discrete points in time with a period Δι;

- consumption) ~ go \) = 1,2, ..., t) of metal or non-recoverable rock in the 1st enrichment product for the period ΐί, ϊ + Δφ

Έ - the summation sign for those products, of which the 1st product is formed in the technological scheme;

p, w - the number of products and

metals, respectively;

- random component of metal consumption or non-recoverable rock;

- coefficients determining the transfer of _) - th (1 = 1.2, .., t) of a metal or non-recoverable rock c) —th product I, B connection

(ABOUT

Krk ·, to ^ 1

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Using this method when building automatic flotation process control systems allows increasing extraction of useful metals into concentrates, reducing reagent costs due to reagent dosages that take into account actual costs of metals at dosing points, and thereby significantly increase the efficiency of the flotation process.

Claims (1)

Claim Fleet process control method based on change in consumption reagents for the consumption of the original power, the content of useful components? in the original and final products, o five 757195 6 in order to improve the efficiency and accuracy of control, they form a measurement interval, measure the consumption of recoverable metals and non-recoverable rock in intermediate products in a dedicated measurement interval, determine the total consumption of components in intermediate products, and measure the control actions taking into account the value found.