SU956023A1 - Method of controlling flotation multistage process - Google Patents

Description

The invention relates to the field of enrichment of useful materials and can be used in the design and implementation of automated systems for controlling the flotation process.

There is a known method of controlling the flotation process by changing the reagent mode depending on the qualitative and quantitative parameters of the pulp and on the content of the useful component in the initial feed 1.

There is also known a method for controlling the multi-stage flotation process, including the main stadial, interstage and prechist stages of flotation, based on the measurement of metal content in ore, intermediate products, cleaner and main flotation stages, concentrate and tailings and change in the consumption of reagents proportional to the metal in ore. 2

The aim of the invention is to improve the control accuracy by stabilizing the amount of feed pulp of the main stage flotation.

The goal is achieved by measuring the volume of the rough concentrate of the main flotation stage, the volume of intermediate products, the volume of the initial pulp, determining the ratio of the volumes of intermediate products to the volume of the initial pulp and successively changing the speed of the foams and the position of the gates on the main stage flotation, maintaining the value found the volume and volume of the rough concentrate of the main flotation stage is constant.

The drawing shows a block diagram of the control device.

The control system of the flotation stage process, including the first

15 (t), the second (II) and the third (III) flotation stages and clearing operations (IV), contains induction flow meters, respectively, 1 and 2 - middlings, 3 - ore quantities, 4, 5, 6,

20 7 and 8 and 9 — the metal content in the products of operations, the device 10 and 11 for adjusting the pulp level of the cleaning process, the control computer 12, the devices 13, 14 and 15 of the reagent feeders, the devices 16, 17 and 18 of the adjustment, the device 19, 20 and 21 speed adjustments.

Particular performance criteria for the operation are determined from the equations

Claims (2)

30 material balance provided. that the calculated amount of metal C T I (to be released to the center, must be equal to the actual amount of metal released into the concentrate, i.e. jr-fip a-ot-g-- ©, where y is the density; ot , p, © - contains metal in the corresponding products. In this case, the material balance equations for the 1st, 2nd and 3 perechistok. e-Tab U P 1 - T4-H T-, .. by means of some transformations | i Haf | bp will take the form - (p-U1®. Ta-Pi - p 3-i tf4-r a r- | j) t8j94 Similarly, the equations for the communication of the flow. The efficiency of the process will be higher, the smaller the number metal will be in Refer from the following operations to the previous ones, provided that the volume of material V is within Vja. For cleanup operations: (op), (opt). VK, (.optr. For basic and control operations, r. (optj, Partial criteria 3, consistent with the general criterion of effectiveness (5, mi p. Their numerical values are directly dependent on the accumulation of metal. Optimization of the process is achieved if the minimum accumulation of metal during the processing of ores with the data characteristics and a given quality concentrate For the calculation optimization methods used are measurement data of CRF-13 (metal content and density) and induction flow meters in accordance with TUVDIKH TOCHK X. During the technological optimization of the enrichment process, optimal parameters of industrial products were found, the values of which for the original ore with a content of 0.9-1.9% were : the content of the useful component in the tailings of the main flotation stage O, 8 1.0%, control 0.7-0.9%, flotation tails 0.13-0.18%, tailings of the M-th stage O, 28-0.35 , the volume of the rough concentrate stage I density equal to 12-15%, 60-70 m / h, tails 1-o recleaning 70-80 MV4, tails second recleaning etc. These values are defined as given, deviations from which lead to metal accumulation in operations and disruption of the process as a whole. Automatic means control the change in the parameters of industrial products in the original ore. The deviations from them are determined, the values of the control actions are calculated by points, a set of signals to control devices is formed, designed to reduce the mismatch between the actual values of the parameters of industrial products and their given values to zero. An automatic control system implementing the method works as follows. . Sensors 3, 4, and 5 measure the amount of ore entering the flotation, the metal content in the ore and tails of the 1st stage, and are transmitted to a control, computing machine (UVM), where the values of the control actions on the 1st stage are calculated. according to the dependency of the TYPE, (i) t1l, where ViLn.- 3, the i-ro control of the impact on the current control step; and cdc is the amount of ore and the metal content in it, and is the coefficient of communication. ; If the metal content in the tails of the 1st stage exceeds its optimum value, then the increments of the values of the control actions d (e n -E Ep-13) + to (0,, op1) (d) are calculated, where D. n - the increment value of the i-th control action at the current control step; ,, - metal content in the tailings, opt max of the 1st stage at the current, previous m steps of control and optimal ;. KO, KIJ, coupling coefficients. Then UVM produces a signal to the device 13 feeder reagents. . Sensors 1 and 2 measure the feed costs of the rough concentrate of the 1st stage and are transmitted to UVM, where the increment of the control actions values to 1.11 and III stages is performed in order to stabilize the indicated costs. To stabilize the consumption of the rough concentrate, the increments of the control action are calculated by the formula A. (y,., Dpt) (iV to stabilize the power consumption of the 1st stage, AY..c ,, (V Cn3-v opt) (4), where Y, P, the consumption of the rough concentrate and the power supply of the 1st stage - at the control stage; - the optimal consumption of the rough concentrate of the power supply of the 1st stage. Further, the VUF generates a signal to the pulverized level control devices and the control devices 16, 1 17, 20 , 18 and 21. Foam removal speeds. Sensors 8 and 9 measure the metal content and in the tailings of the cleaner, the finished concentrate The data are transmitted to UVM, where the values of the increments of the control actions are calculated with the aim of controlling the quality of the concentrate a. I. (K5 () (S), where (, (metal content, in the final concentrate on the current and previous control). (Lpl at V n jfVnOpt const at V fn). Set value of the finished concentrate quality at the current step; plan. Value of the finished concentrate quality; V (, Cn, V, opt - metal content in the cleaners tails at the current step control and optimal,. Then UVM produces a signal to the device level control. Pu.ppy and devices for the speed of foam removal. The sensor 6 measures the content of metal in the tails of the second stage is transmitted to the ACU, where the values of the control actions and the increments thereto for the second stage are calculated: The values of the control actions are calculated using the formula: .Hp eh) and increments it is calculated by the formula (2). The sensor 7 measures the metal content in the tails of the III stage and transmits it to the CCM, where the values of the control actions and the increments to them at the I – I – nd stage of the flo- ter are calculated. for dependencies similar to those for stage I. The use of the flotation process control method makes it possible to increase the quality indicators of growth: by recovery - about 1.6%, quality of the finished concentrate - 1.2% and reduction of reagent consumption by an average of 20%, water by 20%. The invention The method of controlling a multi-stage flotation process, including the main stage, interstage and cleaner stages of flotation, based on measuring the metal content in the ore, the intermediate products of the cleaner and main stages of flotation, concentrate and tailings and the change in the consumption of reagents proportional to the metal content in the ore, , - that, for the purpose, accuracy increase; control by stabilizing the amount of feed pulp of the main stadial flotation, the volume of the rough concentrate of the main flotation stage, the volume of intermediate products, the volume of the initial pulp are measured, the ratio of the volumes of the initial pulp is determined and the velocity of the foams and the position of the gate on the main stage flotation are consistently changed The ratio of the volume and volume of the rough concentrate of the main flotation stage is constant; . Sources of information taken into account during the examination 1. USSR author's certificate No. 202021, cl. At 03 D 1/00, 1962. 2. Authors certificate of the USSR 238646, cl. At 03 D 1/00, 1966 (prototype).