SU854449A1 - Method of automatic control of flotation process - Google Patents

Description

The invention relates to the control of the flotation process and can be used in the development and implementation of automated control systems for flotation process processes at the processing plants of ferrous and non-ferrous metallurgy, construction materials, chemical industry. A known method for controlling the flotation process is based on a change in the magnitude of the circulating streams. This method provides optimal flotation performance for ore and prevents overloads in the circuits of the circulating load of lead floatation. The disadvantage of this method is that it does not provide for the regulation of circulating flows, which makes it possible to achieve equality of circulating circuits in the circuit, which significantly reduces the accuracy separation (separation of minerals by flotation. There is a method of automatic control of the flotation process, including the change in circulating currents as measured by In this method, the measured flow rate of the circulation load is changed by the simultaneous and unidirectional impact on the foams of all cleaners .t2. The disadvantage of this method lies in the lack of synchronization of the main and cleanup operations in C1F1 after equal circulating loads, as a result the separation properties of the process, the separation accuracy is reduced (by flotation of the screws and, as a result, the technological parameters of the process. The purpose of the invention is to improve the accuracy of control of the flotation process with cleaning and control operations.

The goal is achieved by measuring the flow rate of the circulator (their flows in the cleaning and control operations, comparing the measured values, with a positive difference reduces the degree of aeration 8 of the control operation and increases in cleaner circuit, and with a negative difference are on the opposite.

Figure 1 shows the separation characteristics of a separate flotation machine # if at .2-4 separation characteristics of actual length. synchronized, and two options for desynchronization; Fig. 5 is a block diagram of the CAP.

Considering flotation as a separation (separation) process, with a certain degree of particle size reduction and surface treatment with reagents, we introduce the concept of the distribution of 2G (1) mineral particles by flotation a and 1 (. The term от ability to determine the mineral particles to stick to the bubble , i.e., to be fixed on its surface. At the same time, the higher the strength of a particle sticking to the bubble, the greater the value of flotation characterizing the floatability of the particle and vice versa. From this it follows that the particles are not recovered during the flotation process, i.e. go to the chamber product (tails), have a capacity value of 1 0. Particles that are entirely recoverable into a foam product (concentrate), have a maximum value of V 1 of floatability. , in the volume of photomashig 1, the value of floatability of mineral particles takes a continuous series of values from 1 0 to t, secondly, the whole mass of particles usually taken as a unit can be divided into weight fractions, each weight having its own function range, different from the others, those. in the crushed and reagent-treated raw materials, there is a distribution of U (1) mineral particles over the floatable type. At the same time, the distribution of mineral particles by the capacity (t () dtiKanH4ecT) characterizes the weight fraction (or volume) of the particles of the narrow fraction of the capacity 1 (considered mixture of particles of the raw material. It is necessary to give a numerical estimate

great floatability. For the measure of the floatability of the monomineral particles, the kinetics rate kinetics coefficient is taken.

flotation 1 ((/ beats / s), determined from the Beloglazov’s kinetics equation for

S.

Where

extraction into foamy duct, weight fraction j 5 - free surface

bubbles in the unit pulp volume, m-D Smera degree of aeration); k. - duration of flotation Flotation capacity 1 is numerically equal to the average arrival speed with fixing of mineral particles at the gas-liquid interface at a unit concentration in the pulp and at S 1 m / m and is determined experimentally through the tangent of the tangent angle at the beginning of the curve (1) of flotation kinetics . At the same time, the separating characteristics of an individual phptomappny or of the whole photoproduction process can be assessed by the distribution function of extracting narrow flotation fractions into concentrate € j, (il) which is numerically equal to the ratio of the weight of the narrow fraction t (+ dk in concentrate to its weight in the feedstock:

QtconTKOH (.) DU

U)

ISLO.ZK

D "KS /% CX

concentrate and initial productivity;

w lfviC l distribution

particle floatability for concentrates and raw materials.

In the simplest case, when the flotation scheme consists of one (main) operation, then

... W

D)

Hon

55 where bf is the flotation time

Claims (2)

in this operation, cj k is variable for the ability of the mineral particles to be mobile, m / s. It can be seen from formula (3) that the flotation machine is an imperfect separator sensitive to the flotation of mineral Particles 1. (Vqr. Its separation characteristic for the feed channel - the foam product has an exponential character and differs from an ideal separator by the equation of a step link of the type e ..M (KK,) lOqjutK 1 (p, where Up is a constant defined as the floatability of the separation. Particles of the raw material that have the floatability of separation (1 (p half fall into the concentrate, half of the needles Particles fall into the concentrate, and particles from 1 (1 (p into tails). If the flotation time is tp COHei- and SConst., then various fractions of this type are recovered into the concentrate with different proportions, for 1 (determine the value of 1 (p (p flotation of separation) it follows that f, 0.5ffrom the logarithm of the formula SZ, we find an increase of -t or 5 leads to a decrease and, conversely, a value of 1 (p depends on the reagent processing of minerals and is characteristic of flotation machines only, (V and 5 parameters characterizing the properties of this flotation machine, and formula 3 is the main Separation characteristic of this machine. Consider the flotation scheme. The omissions of the calculation by the balance equation write immediately the final formula for the resultant separation characteristic of the whole, expressed through characteristics. chsshh “H„ re- () аУ g-iC) gzW 1- € i (k) e / Oe2 “(V65 (k), {) (where 6 (1 {), € 2SI,) are the separation characteristics of the control and cleanup operations ; the second mass of the narrow fraction of the capacity in nepe-i pure and the original product. Separation characteristics. Calipers ruyuf (x loads are obtained from the balance equations of the scheme for the narrow fractionality of floatability rk.k - “- dk. R) .. Eiiiii, -1.5 Cgd-1– €, (... 52bW. iiC ± iiL (V, w, e ,, b2: -e f E c m-e. On the GZ, a typical variant of synchronization is shown, in which Sji.S, tq, ne, tq, S, t. a. On fig.Z is another typical variant of desynchronization (in the other direction, in which Nd FIG. 4 The dashed lines show the curve in the reen of figure 2. In order to obtain a practical conclusion from the danup analysis of FIG. It should be pointed out that the hardness performance in the specified product is avna; Kia T .., A) dk, (c) xapaKterized the ragfede l81 of those narrow fractions flotation from the supply circuit. W of formula 8 it follows that the circulating load is the more the larger the area under the graph t1) in FIG. 3, the same applies to the second circulating load considering this, from the analysis of the curves (Fig. 2) the following conclusions can be drawn: in the synchronized performance mode, the same in the circulating loads are the same Qj Qg, with desynhro isal, and vice versa Q with rjtQ, in sync In the controlled mode, the EppcCU) has a maximum steepness at the point | the next rule. If Q QG then 1 (0, and it is necessary not to change the control action. If 1 ° 51, -1f I. f., You need to increase S - ,, tq., And reduce 52-Ü 2 If Qg O e, then. F% H must be increased and increased by 52-f.2. From this it follows that to level the flow (the timing of the circuit must affect either the degree of aeration S {or the flotation time.) F, the degree of aeration can be affected by adjusting the air flow supplied to the cells of the flotation machine, and for the flotation time - taking into account that Lf - M f Q, changing the flow rate of the pulp through the flotation machine. This or another method depends on which of the options is the easiest for these specific conditions. Stru1: turnna diagram of the automatic control device (Fig. 5), the rectification method, supporting flowmeters 1 and 2 solid in the circulation load 9 operations, for example, slotted flowmeters of type ИРТ, regulator 3, for example, UVM of type M-6000, executive MexaHH3Nb 4 and 5 air supply into the chambers (} 1 cleaning and monitoring machines. The operation of the device is as follows. Circulating loads 05 and Q are automatically measured by flow meters 1 and 2 solid in the pulp. The measured signals are compared with each other in controller 3. With Qj-F Qg, the controller through actuators 4 and 5 gives the commander to change the air supply (and therefore the degree of aeration of the rear and the S) in the cleaning and control flotation mats in accordance with The above rule, i.e. when Qj 7 Q, the air supply decreases (hence the degree of aeration 5 -,) to the control operation (or the values in the process of the cleaning process increase), and when Q Qg, the regulator gives the reverse commands. If Q5, the control actions do not change. The use of the invention according to the invention makes it possible to increase the accuracy of the separation of mineral particles, which leads to an increase in the extraction of valuable components into the concentrate and an increase in their content in the concentrates. Claims The method of automatic control of the flotation process, including changing the circulating fluxes at the measured flow rate of the solid in them, is characterized in that, in order to improve the accuracy of control of the flotation process with cleaning and control operations, the flow rate of runnel flows in the cleaning list and the control operations, compare the measured values, with a positive difference reduce the degree of aeration in the control operation and increase in cleaning, and with a negative difference the degree of aeration in operations is reversed. Sources of information taken into account in the examination 1.Barsky LA, Kozin VZ System analysis in the enrichment of minerals. M., Nedra, 1979, p. 2. USSR author's certificate number 598643, cl. In 03D. 1/00, 1979. r Xp HO to X-S ,, K  . .3 BASIC / ioptaci 1L 2, Q I