RU2445171C2 - Method of automatic control over hydraulic cyclone - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention relates to automatic sizing of materials in hydraulic cyclones and may be used at mineral processing plants of nonferrous and ferrous metallurgy, coal and chemical industries. Method of automatic control consists in that sand flow rate is varied depending upon pulp flow rate ratios at hydraulic cyclone inlet and outlet and, besides, sand flow rate is corrected additionally subject to separation coarseness with due allowance for pulp viscosity at hydraulic cyclone outlet.

EFFECT: higher accuracy of solid particle sizing due to improved control quality.

1 dwg

Description

The invention relates to methods for automatically controlling the processes of separation of material by size in hydrocyclones and can be applied at enrichment enterprises of non-ferrous and ferrous metallurgy, coal and chemical industries.

The well-known "Method of automatic regulation of the operation of the hydrocyclone" (Zubkov G.A. et al. Automation of the concentration of non-ferrous metal ores. - M .: Nedra, 1967, p.112-113), in which, depending on the density of the product, an effect on the controlled nozzle mounted on a sand nozzle.

The disadvantage of this method is the lack of an unambiguous relationship between density and size, as a result of which there is an insufficiently accurate separation by size, the discharge of the hydrocyclone is clogged with large particles, and the sands, on the contrary, are small.

The well-known "Method of automatic regulation of hydrocyclone" (Povarov A.M., Zabirov MG Automatic regulation of hydrocyclones // Ore dressing, 1958, No. 3, p. 33-40). The disadvantage of this method is the inaccurate separation of solid particles by size due to a violation of the vacuum in the hydrocyclone due to suction of air from the discharge side and overlapping by the sands of the lower end of the air column with small diameters of the sand nozzle, clogging of the vacuum tube inserted into the hydrocyclone through the hole in the center of its upper cover , as well as the bulkiness and complexity of the entire system as a whole.

The well-known "Method of automatic control of a hydrocyclone" (A.S. SU 850229, publ. 07/30/1981, bull. No. 28), adopted as a prototype. In order to improve the accuracy of separation of solid particles by size by improving the quality of control, the flow rate of the sands is changed depending on the ratio of the flow rate of the pulp on the sink and the sand of the hydrocyclone.

The disadvantage of this method is that it does not take into account the influence of the viscosity of the discharge pulp when controlling a hydrocyclone, does not meet modern requirements for the quality of control of a hydrocyclone.

The technical result consists in increasing the accuracy of separation of solid particles by size by improving the quality of control.

The technical result is achieved by the fact that in the method for automatically controlling the hydrocyclone by changing the flow rate of the sands, in which the flow rate of the sand is changed depending on the ratio of the pulp consumption on the discharge and the sand of the hydrocyclone, the flow rate of the sand is changed additionally depending on the size of the separation, taking into account the viscosity of the pulp on the discharge of the hydrocyclone.

The technical problem is achieved by making corrections to the product quality control loop according to the current value of the hydrocyclone discharge viscosity.

In practice, stabilization of the size of the size of separation does not guarantee the required product quality. This happens when changing the viscosity of the pulp of the discharge of the hydrocyclone. It would be logical to introduce a correction into the quality control loop of the finished product according to the current viscosity value of the hydrocyclone discharge pulp.

The adjustment of the size of the separation size taking into account the viscosity of the pulp at the discharge of the hydrocyclone leads to a change in the quality of control, which will provide the required particle size for subsequent processes in the discharge of the hydrocyclone.

Figure 1 presents a schematic diagram of a device that implements the proposed method. The method is as follows. The pulp consumption in the drain and sands of the hydrocyclone 1 is measured by flow meters 2 and 3, respectively, and the viscosity of the pulp in the drain with a viscometer 4 installed on the drain of the hydrocyclone 1. Data in the form of electrical signals are sent to the control microcontroller 5. In the microcontroller 5, the viscosity of the pulp on the drain of the hydrocyclone 1 is compared with a given value of viscosity, which is determined during the calibration of the system depending on the type of ore. When the imbalance value is higher than the threshold value, taking into account the magnitude and sign of the resulting mismatch, a control pulse is generated, which, through the actuator 6, acts on the regulatory body 7, changing the cross section of the sand nozzle in order to remove the imbalance. With increasing viscosity of the pulp on the drain, the diameter of the sand nozzle will decrease and vice versa. In this case, the size of the separation is stabilized at a given value.

The application of the proposed method for automatic control of a hydrocyclone can improve the quality of separation and maintain a given separation size due to the measurement of the viscosity parameter in the discharge of the hydrocyclone.

Claims (1)

A method for automatically controlling a hydrocyclone by changing the flow rate of sands, and the flow rate of sand being changed depending on the ratio of pulp consumption on the discharge and in the sands of the hydrocyclone, characterized in that the flow rate of the sand is further adjusted depending on the size of the separation taking into account the viscosity of the pulp on the discharge of the hydrocyclone.

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