SU1583134A1 - Method of controlling process of pulp thickening - Google Patents

Abstract

The invention relates to methods for controlling thickeners and can be used in the mining industry at concentrators. The application of the invention allows to stabilize the quality of the finished product. The method involves mixing the product thickened in a thickener with the discharge of its intermediate product, subsequent separation of the product mixed in this way into finished and returnable products, measuring the density of the finished product and adjusting the return product and intermediate draining depending on the value of the flow density. This ensures that the volumetric flow rate of the return product and the volumetric flow rate of the intermediate product are equal. 1 il.

Description

The invention relates to methods for controlling the process of pulp thickening and can be used in the beneficiation plants of mining enterprises.

The purpose of the invention is to increase the parameters of the finished product.

The drawing shows a schematic diagram of a control system implementing the proposed method.

The method for controlling the thickening process is as follows.

The original pulp enters the sump pump 1 and further into the thickener 2. The pulp thickened in the capacitive object is pumped through the pump 3 into the mixing chamber 4, where it is mixed with the intermediate thickener 2, and further into the separation chamber 5, in which the mixed the product is divided into a return product supplied to the sump pump 1 and the finished

product out of the cycle for further processing.

The quality of the finished product is controlled using a densitometer 6 and a secondary device 7, the output of which is fed to the controller 8, is compared in it with a specified density value, and depending on the difference of the compared signals, the output signal of the controller 8 ensures that the magnetic starter 9 or 10 is turned on By means of the latter, the windings of the forward or reverse stroke of the actuators 11 and 12 are connected, changing the position (degree of opening) of the throttle valves 13 or 14, respectively. variation goes bulk intermediate discharge costs into mixing chamber 4 and the return of the product in zumpf- pump 1.

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The density and volume flow of the pulp from the thickener 2 are stabilized by diluting the condensed product with a certain volume of the intermediate product (intermediate spruce) condensation to the required density and then separating the same amount of product that has been added to the already stable product. by volume upon dilution, wherein the jute product is withdrawn from the cycle as much as it is withdrawn from the bottom of the thickener 2

The proportionality of the flow characteristics of the throttle valves 13 and 14 is ensured by their uniformity and uniformity of the pipelines on which they are installed, as well as by regulating the end locking contacts of the actuators 11 and 12 in the process of setting up and operating the system

According to the indications of the remote indicators 15 and 16, the position of the actuators I and 12 judge the accumulation of pulp material mass in a closed thickening cycle, since as the density of the condensed product increases and the intermediate product drains, the degree of opening of the throttle valves 13 and 14 increases, and vice versa According to the indications of the remote indicators 15 and 16, it is possible to judge about the need to increase (decrease) the flow rate of the condensed product by changing the position of the valve 17 at the inlet of the pump 3, while the p finished product cycle loop

Example Suppose that pump 3 receives 100 tonnes per hour of pulp material with a density of 75% solid

The setting of regulator 8 corresponds to 20% solid. Then in order to dilute

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condensed product to a predetermined density (20% solid intermediate product) with a density of 5% solid requires 490 tons / h (approximately 467 tons / h of water and 23 tons / h of solid) At the same time, the throttle valve 14 is separated from the separation chamber 5 to return to sump - pump 1,490 t / h (590 t / h, where about 98 t / h of solid and 492 t / h of water). Thus, the cycle continuously exits 100 t / h of density-averaged (20% solid pulp material). When the return volume (equal to the flow rate of the intermediate product into the mixing chamber) exceeds the specified range, this is determined by the indications of indicators 15 and 16 , followed by a command to connect (disconnect) the backup devices of the subsequent process, after which the supply of the condensed product to the pump 3 is gradually changed

Claims (1)

Invention Formula A method of controlling the process of pulp thickening by returning a part of the thickened pulp and changing the flow rate of the return product depending on the density of the finished product, characterized in that, in order to increase the stability of the parameters of the finished product, the thickened product is mixed with the discharge of its intermediate product followed by separation of the mixed product on the finished and return products, the flow rate of the intermediate product of the thickener varies depending on the density of the finished product, while ensuring equal flow rate of the return product to the intermediate discharge flow rate