SU1343606A1 - Method of controlling flotation process - Google Patents

Abstract

The invention relates to flotation enrichment in coal industry, in ferrous and nonferrous metallurgy, in the industry of mineral fertilizer production. The purpose of the invention is to control accuracy by increasing extraction of the useful Component (PC) to concentrate (K). Ready K is divided into two parts. One of them returns to the beginning of the process, and the other is removed from the flotation process. In this case, together with the particles K, the collector reagent (PC) sorbed on these particles returns to the head of the process. In the original feed, K and tails determine the content of the PC | and PC consumption. From the measured values, 6j ,, the value of E is calculated - the extraction of PC v K. The quality K is compared with the set. If the quality K is lower than the specified one, the increment of the fraction K returned to the beginning of the process is increased by an amount directly proportional to the deviation / and FROM the given and inversely proportional to the PC flow. Upon reaching a given quality K, the increment of the fraction K is proportional to the difference between the current and the preceding values of Е. Management in the case of optimal. 1 il. from 6 (L from 4 00 o o O5

Description

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The invention relates to the field of flotation process control and can be used in the development and implementation of automated flotation process control systems in coal preparation plants, in the production of mineral fertilizers, in ferrous and ferrous metallurgy.

The purpose of the invention is to increase control accuracy by extracting a useful component into a concentrate.

The essence of the method lies in the fact that the finished concentrate is divided into two parts, one of which Joz rotates at the beginning of the process, and the other is removed from the flotation process. When part of the concentrate returns to the beginning of the process, the collector reagent sorbed on these particles returns to the head of the process along with the concentrate particles. At the same time, there are not one monolayer of collector reagent molecules on the floated particles, but several.

The bonds between mineral particles with a high content of the useful component and the first layer of molecules of the collector reagent are much stronger than the bonds between the first layer of molecules and the second and third, etc.

Thus, when a part of the concentrate is returned to the beginning of the process, the molecules of the second, third and subsequent monolayers of the collector reagent molecules are much easier with circulating water — When the concentrate is diluted, than the molecules of the first layer.

As a result of the desorption of the collector reagent, when the part of the concentrate is returned, the amount of the collector reagent in the initial flotation operation increases. Since the collector reagent is desorbed gradually by jHo, the collector reagent is gradually added to each cell of the flotation machine during flotation. This contributes to better selectivity of the collector reagent.

The additional impact of the collector distributed in time contributes to the recovery of the useful component into the concentrate.

With the quality of the concentrate below the specified, the regulation of the increment of the fraction of concentrate returned to the beginning of the process is proportional to the spacing62

. between the concentration of the useful component, which allows to maintain the quality of the concentrate at a given level.

In this case, control is by rejection.

At achievement of the set quality regulation of an increment of this share

proportional to the difference between the current and previous values of extraction of the useful component, which allows optimizing the flotation process. In this case, the control will be optimal.

The return of a portion of the concentrate to the initial flotation operation leads to an increase in the specific amount of sorbed reagent per unit surface of particles with a high content of useful compound. Therefore, it is necessary to adjust the return fraction inversely proportional to the consumption of the collector reagent.

Regulation of increment share

the flotation concentrate returned to the beginning of the process is inversely proportional to the consumption of the collector reagent, which provides optimal conditions for the flotation of particles with a high content of useful component.

With a low quality of the concentrate (below a predetermined level), the increment in the proportion of concentrate returned to the beginning of the process is equal to

, „-., I.

where fl and ft are the specified and measured contents of the useful

component; Q - consumption of the collector reagent;

K is the coefficient j determined from the analysis of the separation characteristic of the circuit;

K2 - coefficient depending on the properties of the collector reagent (g / g) When the quality of the concentrate is greater than the specified, this proportion is equal to

Lta

..

Q

five§

 TO"

. (Er) - - - where E and. E is the current and previous value of the extractable useful component in the Concentrate; Kj is the coefficient determined by the separation characteristic of the circuit; K is a coefficient determined experimentally depending on the properties of the collector reagent (g / g) -.

The drawing shows a block diagram of a flotation process control system.

The flotation process control system contains a meter of 1 content of the useful component in the initial feed, a meter 2 of the content of the useful component in the concentrate, a meter 3 of the content of the useful component in the tails, a meter 4 of the collector reagent consumption, a regulator 5, a divider 5 of the concentrate flow.,

The system works as follows.

Gauges 1, 2, and 3 determine the content of the beneficial component in the feed and enrichment products.

The system calculates the extraction of the useful component according to known ratios. There is also a comparison of the quality of the concentrate with the setpoint. If the quality of the concentrate is lower than the specified, controller 5 increases the increment of the fraction of concentrate returned to the process start by an amount directly proportional to the deviation of the measured quality (signal from the meter 2) from a given and inversely proportional to the consumption of the collector reagent (signal from the meter 4). The device operates at intervals from O, t to 4 f ("is the time constant of the scheme). In the manner indicated above, the control unit seeks to obtain a concentrate of a given quality, determining at each step the extraction of the useful component into a concentrate ..

After that, the device begins to work in the optimization process, optimizing the extraction of the useful component in the concentrate.

If at the same time there is a decrease in the quality of the concentrate below the preset, the system switches to regulation

five

0

five

on the qualifier of the qualifier of coicentrlt from the team.

Claims (1)

The use of the invention allows to increase the yield and quality of industrial o6br-aHkeHHH products. Invention Formula Way control (1and the flotation process, including measuring and storing the current value of the useful component in the finished concentrate, distributing the circulating process streams by individual operations, changing the reagent consumption in proportion to the content of the useful component in the finished concentrate, determining and storing the current value of extraction useful component in concentrate, characterized in that, in order to improve the control accuracy by increasing the extraction of useful component in concentrate, the proportion of return the concentrate to the initial flotation operation, measure the specific consumption of the reagent, determine the difference between the desired and current content of the useful component in the final concentrate, determine the ratio of the difference between the specified and measured content of the useful component in the finished concentrate to the measured specific consumption peat-eHTH, determine the difference between the current and previous values of the extraction of the useful component in the concentrate, determine the ratio of this difference to the specific consumption of the reagent and, ec and the difference between the target and the current measured contents of the useful component in the concentrate is greater than zero, the increment of the fraction of the finished concentrate returned to the initial flotation operation changes in proportion to the ratio of the difference between the specified and measured contents of the useful component in the concentrate to the specific consumption of the reagent, and if the difference between the set-. and the current content of the useful component in the concentrate is less than zero, the increment of the fraction of the finished concentrate that is returned to the initial flotation operation changes in proportion to the ratio of the difference between the current and the previous value 5 m extraction of the useful component in the concentrate to the specific consumption of the reagent. 0 five 0 five Source power Re and gene t-coffupamenb Technology / t eat a and f / utation gi Concentrate V Tails (Clotacia Editor S. Kulakov Compiled by I. Naearkina Tehred M. Didyk -. , Proofreader L. Patay 3385 Circulation 526 VNII11I State Committee of the USSR for inventions and discoveries 113035, Moscow, G-33, Raushsk iab, D. 4/5 Production and printing company, Uzhgorod, st. Design, And Subscription