SU1247087A1 - Method of controlling flotation - Google Patents

Description

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The invention relates to the enrichment of polar minerals and can be used to automatically control the flotation process.

The purpose of the invention is to improve the control accuracy.

The essence of the method lies in the fact that simultaneously with the measurement of the ratio of floated and depressed products by the thickness of the foam layer, the distribution of floated and depressed products by size classes at the inlet of the flotation process is recorded, the distributions found are remembered, then determined. periodically, comparing stored values with periodically determined values, and if they are not equal, they form the beginning of the next cycle

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the ratio of floatable and depress-2o, where they determine the distribution over the classified products over the thickness of the layer

foam.

The drawing shows a functional diagram of a control unit that implements the method.

The device contains sensors 1-3 content floatable and depressed products in the input and output products of the flotation process. The sensor outputs are connected to the computing device 4. The output signals from the computing device 4 are fed to the actuators 5 of the actuator of the gates 6, which regulate the pulp level of the flotation machines, and the software device 7, which determines the stepwise movement of the gates 6. In block 8, the distribution of floated and depressed products is determined by size classes in the input product. This information through the input device 9 is entered into the computing device 4.

The control method is carried out as follows.

The measurement cycle of the ratio of floatable and depressed products across the thickness of the foam layer starts from a signal from a computing device 4. From sensors 2, signals of the content of products in the concentrate with each step change in the level of the pulp specified by the software device 7 enter the computing device 4, in which they implement plotting and memorizing, until the next cycle, the curves of the relative concentration of floated and depressed products over the thickness of the foam layer.

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the size of floated and depressed products. From block 5, this information is entered through input device 9 into computing device 4, where it is stored. Further, the distribution of floatable and depressed products by size class is determined periodically, introduced into the computing device and compared with the stored one. In case of inequality between the periodically measured and memorized distributions from the computing device 4, the signal to the software device 7 is inserted and a new measurement cycle of the ratio of flotation / depressed products through the thickness of the foam layer is started.

Measurements of the contents of floatable and depressed products at the inlet and outlet of the flotation process are carried out (to monitor the flow of the process) with a predetermined period by sensors included in the automatic system for analyzing pulp flows. In preparing the sample, the input product of the flotation process is divided and partly directed to determine the distribution of floatable and depressed products by size class, for which the sample is scattered by size classes and the content of floatable and depressed products is measured in each size class. At the processing plants, the input product of the flotation process is periodically monitored for particle size, for which the sample of the input product is dispersed into a given number of classes. Lp

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At the same time, the signals from sensors 1 and 3 of the content of JI pty.m. and depressed products in the inlet - product, waste flotation process. According to the data obtained in the computing device 4, the system of equations of the flotation kinetics is solved, which, given the constraints JQ, determines the ratio between the floatable and

with depressed products, optimal, according to specified requirements, pulp levels in flotation machines, and signals to auxiliary J5 mechanisms 5 and 6 valves, which establish the required ratio of pulp levels, are moved. The mass of floated and depressed products at the inlet of the flotation process is analyzed in block 5,

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the size of floated and depressed products. From block 5, this information is entered through input device 9 into computing device 4, where it is stored. Further, the distribution of floatable and depressed products by size class is determined periodically, introduced into the computing device and compared with the stored one. In case of inequality between the periodically measured and memorized distributions from the computing device 4, the signal to the software device 7 is inserted and a new measurement cycle of the ratio of flotation / depressed products through the thickness of the foam layer is started.

Measurements of the contents of floatable and depressed products at the inlet and outlet of the flotation process are carried out (to monitor the flow of the process) with a predetermined period by sensors included in the automatic system for analyzing pulp flows. In preparing the sample, the input product of the flotation process is divided and partly directed to determine the distribution of floatable and depressed products by size class, for which the sample is scattered by size classes and the content of floatable and depressed products is measured in each size class. At the processing plants, the input product of the flotation process is periodically monitored for particle size, for which the sample of the input product is dispersed into a given number of classes. Lp

measurements of the content of Hg products in each size class use equipment for analyzing the material composition of powder samples.

Denote by x

(TO)

vcn

1st stream

the product of the k-th class size at the inlet of the flotation process. Then, for example, for two size classes (the first one is -0.074 mm; the second one is +0.074 mm), the i-ro distribution of the product by size class is set by the ratio expressing the proportion of the product contained in the first size class,

(11 5 (

R

VN

X

(1) ex (i)

+ X

(21 Bv (i)

which is determined by the measured contents of the 1st class of particle size q. . at the inlet of the flotation process20 the thickness of the removed layer of foam flow

BH. (1) „

and. product contents in the first o j size class

second s

(one}

(eleven

R

inX (()

. AT

()

product, going into a concentrate, functional from f. (B) - Since the product flow, the output to the tails is associated with the product flow in the concentrate by the material balance equation, it is also a functional of F – C.). Consequently, about the connection between changing the shape of the h- - curve (hp and changing the distribution of products

Consider the mechanism of the effect of product distribution by size class at the entrance of the flotation process

on the shape of the curve H. divided into size classes at the entrance to the process of separation of the product along the height of the foam layer. The main factor determining the height of the particle in the foam layer compared to particles of the same product is the particle size, hectares. Particles of flotation size classes (+ 0.01-0.074 mm) are carried in the foam layer to a greater height. When the product is redistributed into size classes at the inlet of the flotation process, Q, for example, as the proportion of particles of flotation size classes increases, the product distribution over the height of the foam layer changes accordingly.

In the case under consideration, a large proportion of product particles is brought to the same output and to increase the accuracy in the foam layer, and the (h,) dependence changes accordingly. therefore

of the ratio of floatable and depressed products across the thickness of the foam layer. Editor E. Kopcha

Compiled by I. Nazarkin Tehred V. Kadar

Order 4047/9

Circulation 514

VNIIPI USSR State Committee

on inventions and postcards 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Project, 4

the distribution of products by size class at the inlet of the flotation process is taken as a variable of the shape of the H curve. (h) and shape change

M / t. l - J

(p ..) predict change

and .1 distribution of floatable and depressed products by size class at the inlet of the flotation process. Evaluate the relationship between these changes.

Denote the flow distribution of the i-ro product over the height of the foam layer in the j-th flotation machine as x, | j hj. Then, with the foam layer being removed with thickness H, the concentrate goes over J Xp (l) (bj) dhj.

product. Since the distribution of the product flow over the height of the foam layer is determined by the dependence M-JJ (h,), the product flow that goes into the concentrate depends on it. At constant

the product going into concentrate is the functional of f. (B) - Since the product flow, the output of the tailings, is connected with the flow of the product into the concentrate by the material balance equation, it is also a functional of F – C.). Consequently, about the connection between the change in the shape of the h - - curve (hp and the change in the distribution of the products

Sa can be judged on the basis of the relationship between product flow to the tailings and product distribution by size class at the process inlet or, using measured output, between the product content in the flotation tails and the distribution of floatable and depressed products at the process inlet.

The use of the invention allows to improve the technological performance of the process by reducing the frequency of disturbing influences on

of the ratio of floatable 15gx and depressed products through the thickness of the foam layer. I. York Corrector

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Claims (1)

METHOD OF CONTROL OF THE FLOTATION PROCESS, based on measuring the ratio of the contents of floated and depressed products by the thickness of the foam layer and changing the ratio of pulp levels with a period determined by the set value of the difference between the measured values for two consecutive control cycles, characterized in that, in order to improve the control accuracy, additionally determine the distribution of the contents of flotated and depressed products by size classes at the inlet of the flotation process and adjust the ratio s pulp levels of the value found content distribution and floated depressiruemyh by size classes. product _m SU 1247087 1 12.4