SU1398168A1 - Method and apparatus for controlling conditioning of pulp with reagents - Google Patents

Description

The invention relates to mineral processing and can be used to control the process of conditioning pulp with reagents before flotation and foam separation of minerals. 5

The aim of the invention is to improve the accuracy of controlling the conditioning process. Due to the stabilization of the flow rate of the products of radiolysis of the emulsion of reagents.

'·. The drawing shows the functional diagrams of the device.

It is known that the preliminary irradiation of reagents or their emulsions before feeding to the flotation has a positive effect on the process of extracting useful minerals, significantly improving its technological parameters. It is known that the yield of radiolysis products q (kg) depends on the absorbed dose of ionizing radiation, D _l (J / kg), that is, the amount of energy absorbed by a unit mass of a substance. Taking into account the quality factor K, which depends on the type of ionizing radiation, its energy, absorbed dose rate, the properties of the irradiated substance and numerically equal to the amount of energy (J) needed to form q, the number of radiolysis products q - The quality coefficient K is found experimentally in each case. thirty

The optimal conditioning conditions for the initial pulp with radiolysis products, for example, emulsifier-collector emulsions, are determined by the consumption of the amount of radiolysis products per unit mass of the pulp R = jjp where R is the radiolysis consumption, kg / t; M t is the amount of pulp, t. It follows that R 40

The absorbed dose is determined by the expression D _n = where E _l is the amount of energy absorbed by ^ 5 the irradiated substance per unit time and depending on the radiation source and the irradiated material, that is, for specific conditions the value is constant, J / s .;

T is the exposure time of the substance;

c — the time of irradiation of a unit of mass or volume in an irradiation reactor of volume V. Using the well-known formulas for the flow rates of liquid and solid, the flow rate of radiolysis products, depending on the flow rates of solid in the pulp and the emulsion being irradiated, in general is refined for solid in solid products expression R =

En-Q-1-in-Tu * where R is the consumption of the products of the radiolysis of the emulsion of the reactants, kg / t;

K is a quality factor numerically equal to the energy necessary for the formation of a certain amount of radiolysis products. J;

Q _iH is the flow rate of the emulsion of reagents supplied to irradiation. m ^?, / s;

at _{en — the} density of the emulsion of reagents supplied to the radiation, kg / m ³ ;

E _p - the amount of energy absorbed by the irradiated emulsion of reagents per unit time, J / s;

Q _{TB —} pulp consumption, m ³ / s;

T — time for measuring pulp flow rate, s; ί _η is the density of the pulp supplied to the conditioning, t / m ³ .

Thus, in order to effectively influence the process of conditioning pulp with the radiolysis products of reagents, such as collectors, it is necessary to regulate the consumption of radiolysis products of reagents (or their emulsions) supplied for conditioning, taking into account the costs of the emulsion of reagents and pulp entering the conditioning.

The method of controlling the process of conditioning pulp with reagents is as follows.

The flow rate and density of the pulp entering the conditioning are measured. Signals proportional to the measured parameters are multiplied and receive information about the flow rate of solid in the pulp. In proportion to the amount of solid, the flow rate of the reagents that enter the emulsifier is provided, where they are emulsified. The emulsion of reagents is supplied to irradiation, while the flow rate of the emulsion of reagents entering the irradiation is measured, and the flow rate of the products of the radiolysis of the emulsion of reagents is measured when they are supplied for conditioning. The flow rate of the radiolysis products is regulated in accordance with the flow rate of the solid and the flow rate of the emulsion of reagents, and the regulation is carried out in accordance with the expression above. This method of controlling the process of conditioning the pulp with reagents allows, in accordance with the parameters of the initial pulp, (its density, flow rate, etc.), as well as the parameters of the products of the radiolysis of the emulsion of reagents (density, flow rate, etc.) to improve the accuracy of control of the conditioning process, due to which, as shown by studies, significantly increase the technological parameters of the process of mineral flotation.

The developed device is shown in the drawing. It includes a densitometer 1 and a flowmeter 2 installed at the input of the contact tank 3, a multiplication unit 4, the input of which is electrically connected to the outputs of the densitometer 1 and flowmeter 2, while the output of the multiplication unit 4 is connected to the regulator 5 of the reagent flow (set of densitometer 1, flowmeter 2 and multiplication block 4 represents a solid flow meter for air conditioning). The reagent flow regulator 5 is installed in front of the emulsifier 6, which is connected through the reagent emulsion flow meter 7 to the irradiation reactor 8, the output of the reagent emulsion flow meter 7 is also connected to the radiolysis product flow control regulator 9, the second input of which is connected to the output of the multiplication unit 4, and the output of the regulator 9 stabilization of the flow rate of radiolysis products through the actuator 10 is associated with. unloading device 11 of the irradiation reactor 8, the output of which is connected to the contact tank 3.

The device operates as follows.

The pulp intended for conditioning, through the densitometer 1 and flowmeter 2, enters the contact tank 3. Signals proportional to the density and flow rate of the pulp from the densitometer 1 and flowmeter 2 are fed to the input of the multiplication unit 4, at the output of which an electrical signal corresponding to the flow rate of solid in the pulp entering the air conditioning. This signal acts on the reagent flow regulator 5, which proportionally to the solid regulates the flow of reagents for conditioning. In this case, the reagents enter the emulsifier 6, where water is supplied. Emulsified reagents from emulsifier 6 through the emulsion flowmeter 7. are given to the irradiation reactor 8, where they are subjected to radiolysis. A signal proportional to the amount of emulsion received for radiolysis from the emulsion flow meter 7 is fed to the input of the regulator 9 for stabilizing the flow of radiolysis products, which also receives a signal from the multiplication unit 4, which is proportional to the solid flow rate in the pulp. The regulator 9 for stabilizing the flow rate of the radiolysis products provides for the supply of emulsified reagents located in the irradiation reactor 8 to the conditioning of the radiolysis products. The signal from this regulator is fed to the input of the actuator 10, which, by moving the discharge device 11 in height, of the irradiation reactor 8, unloads the radiolysis products in accordance with the consumption of solid in the pulp. The products of radiolysis through the discharge device 11 enter the contact tank 3 for conditioning with pulp. A conditioned pulp is fed from. contact tank 3 for flotation.

A change in the flow rate of the solid supplied to conditioning causes a change in one direction or another of the magnitude of the signal from the multiplication unit 4. Accordingly, the flow rate of the reagents supplied to the emulsifier 6 changes. The change in the flow rate of the reagent emulsion through the emulsion flow meter 7 acts on the regulator 9, which, in accordance with the changed solid flow rate in the feed pulp, moves the discharge mechanism 11 by the actuator 10 in the direction and by the amount corresponding to the change in flow rate emulsions of reagents and solid entering air conditioning.

Claims (2)

Claim 1. The method of controlling the process of conditioning the pulp with reagents, including measuring the density of _p and the flow rate Vn of the pulp, which determine the flow rate of solid Q _TB , in proportion to which the flow rate of the reagents supplied to the conditioning is controlled, characterized in that, in order to improve the accuracy of the process control C by stabilizing the emulsion of radiolysis products flow of reactants define the reactant flow of emulsion Q _9n, which is subjected to radiolysis, given constant density of the emulsion and reagents, the amount of energy absorbed by the irradiated emulsion reagents E _n, the pulp flow measurement time T and the quality factor K, and the flow rate of radiolysis products is determined by the formula: n, ₌ K · Q EM 's> n_ £ α · (ΞΙτβΊ'ίη 2. A device for controlling the process of conditioning pulp with reagents, comprising a densitometer connected to a pulp flow meter, connected to a multiplication unit, the output of which is connected to a reagent flow regulator, characterized in that the device is equipped with an emulsifier, a reagent emulsion flow meter, an irradiating reactor with a discharge device, and a regulator of the ratios of the flow rate of radiolysis products with the actuator, while the regulator of the flow of reagents through the emulsifier is connected to the flowmeter of the emulsion ENTOV whose output is connected to the input of regulator flow radiolysis products ratios, the actuator is connected to the discharge device of irradiation reactor, wherein the output of multiplication unit is also connected to the input of regulator flow ratios of radiolysis products. Reagento emulsion radiolysis products Nutrition Editor j Kurkova Order 1099 Compiled by I. Nazarkin Tehred I. Veres Corrector M. Maxnmishine Circulation. Subscription VNI11PP of the USSR State Committee for Inventions and Open I 13035. Moscow, Zh. 35, Raushskaya nab., 4/5 Proizvodstvenpoioligraficheskaya nrsayaia gie, Uzhhorod, st. Design. 4