US3549131A - Device for pulsating mixing of liquid and liquid-and-solid reagents - Google Patents

Description

United States Patent [72] Inventors Susanna Mikhailovna Karpacheva.

2 Schukinsky proezd, 2, kv. 88;

Valerian Matveevich Muratov, Astakhovsky per. l/2, kv. 118; Leonid Solomonovich Raginsky, Nikitinskaya ul., l6, korp. l, kv. 29; Vladimir Dmitrievich lvanov, 2 Schukinsky proezd, ll, kv. 6; and Valery Alexandrovich Chernov, ul. Dmitrova, 4, kv. 2, all of Moscow, U.S.S.R. 718,701

Apr. 4, 1968 Dec. 22, 1970 Appl. No. Filed Patented DEVICE FOR PULSATING MIXING OF LIQUID AND LlQUID-AND-SOLID REAGENTS 5 Claims, 2 Drawing Figs.

Field oi Search 259/4, 18, 36, 60, 95

[56] References Cited UNITED STATES PATENTS 2,090,496 8/1937 Wynn 259/95 2,292,897 8/1942 Nielsen... 259/4 3,015,554 1/1962 Rummel. 259/4X 3,097,828 7/1963 Gruen 259/4 3,164,443 1/1965 Watson 259/4X Primary Examiner-Edward L. Roberts Attorney-Waters, Roditi, Schwartz and Nissen ABSTRACT: A device for the pulsating mixing of liquid and liquid-and-soiid reagents comprises a tank communicating with pulsating chambers through nozzles, the nozzles being arranged in one or several rows around the periphery of said tank so that one group of the nozzles is oriented tangentially towards imaginary surfaces or rotation, having a common axis while a second group of nozzles are oriented towards this axis.

DEVICE FOR PULSATING MIXING OF LIQUID AND LlQUlD-AND-SOLID REAGENTS The present invention relates to devices for the pulsating mixing of liquid reagents and liquid-and-solid reagents employed in chemical, oil processing; hydrometallurgical and other branches of industry.

Known in the art are devices for the pulsating mixing of reagents wherein a tank is provided with inlet and outlet connections for the reagents and communicates with pulsating chambers via nozzles. j,

in this device, the nozzle is directed towards the tank bottom and ensures intermixing of liquid reagents. The use of this device for mixing liquid reagents with solid reagents whose particles exceed in size the nozzle diameter proves impossible since the nozzle in this case is isolated from the liquid phase by the mixing particles of the solid'phase. Any stopping of the device leads to clogging of the nozzle and the pulsating phases within a broad range of the solid particle sizes and excludes the possibility of clogging of the nozzles in operation.

In accordance with these and other objects the nozzles in the device for the pulsating mixing of liquid and liquid-andsolid reagents, according to the invention, are arranged around the periphery of the tank so that the axes of one group of nozzles are oriented tangentially to the imaginary surfaces of rotation having a common axis and ensuring a unidirectional rotary motion of the liquid around this axis, while the other group of nozzles is oriented towards said axis.

The axes of the imaginary surfaces of rotation tangentially to which some ofthe nozzles are oriented may coincide with a the vertical axis of the tank.

To improve mixing of reagents it is practicable to direct at least a part of the nozzles downwards, inclined to the axis of rotation. And it is most practicable to arrange the nozzle axes at an angle of 15 to 45 'to-the axis of rotation and mount them in several rows along the height of the tank.

The employment of the present invention for the mixing of liquid reagents and liquid-and-solidreagents ensures intensive mixing owing to continuous rotary motion of the entire mass of reagents around the mixer axis and owing to the penetration of the reagents located at the periphery of the tank towards its central part. Thus conditions are provided for efficient mixing of the reagents both in the longitudinal'and lateral directions. The latter factor is most vital in case of large lateral dimensions of the tank and a comparatively low level of the liquid reagents in the tank.

Other objects and advantages of the invention will be described in detail by way of example with reference to the accompanying drawings in which:

FIG. I is a diagrammatic illustration of the device according to the invention; and

FIG. 2 is a section taken along line II-Il of FIG. 1.

The device for the pulsating mixing of liquid and liquid-andsolid reagents consists of a cylindrical'tank 1 (FIG. 1) provided with an inlet connection 2 and an outlet connection 3 for passage of the reagents in and out of the tank 1. The tank 1 communicates via nozzles d-with pulsating chambers 5 interconnected by a header 6. The tank 1 can be put in communication with the atmosphere through a blowoff connection (omitted in the drawing) or there may be no such connection.

All the nozzles 4 are arranged around the periphery of the tank 1 in a number of rows of a height which promotes efficient mixing of the reagents. The nozzles are located so that they ensure a unidirectional rotary motion of the liquid in the tank 1, around its vertical axis A-A. As a result, the tank has no stagnant dead zones which means that the entire volume of the liquid passes successively through the zones of action of the nozzles. This effect is provided by orienting the axes 843 (FIG. 2) of some nozzles 40 along lines C-C tangential to an imaginary surface of rotation D having a common axis for the unidirectional rota motion. As the tank 1 is cylindrical in shape, the axes of e surface of'rotation D coincide with the vertical axis A-A of the tank 1.

For better mixing of the reagents, particularly solid phases with liquid ones, it is necessary to direct the reagents, thrown by the rotary motion to the periphery, to the central part of the tank. This is ensured by orienting the other nozzles 4b towards the vertical axis A-A of the tank 1 or towards the axis of the rotation surfaces D.

Besides, all or part of the nozzles 40 and 4b are directed to the bottom of the tank 1, being inclined to its vertical axis A-A at an angle a of 15 to 45 (FIG. '1). On stopping the device, this contributes to a rapid evacuation of solid particles from the nozzles and allows the solid sediment to be quickly loosened and stirred up by the pulsating action of the jets of liquid reagents thrown outof the nonles at starting of the device. 7

The reagents are mixed in the device according to the invention as follows. 3

The tank 1 is filled with reagents to be mixed and the liquid reagents fill the pulsating chambers 5 through the nozzles 4. The pulses generated by a pulsator (not shown in the drawing) are transmitted through the header 6 into the pulsating chambers and throw the liquid reagents violently out of the pulsating chambers 5 into the tank 1. Owing to the orientation of some of the nozzles tangentially to the imaginary surface of rotation having a common axis and of the other nozzles toward this axis, the liquid in the tank acquires a rotary motion and the reagents are mixed, moving at the same time from the periphery to the center of the tank. The combination of these two motions ensures a turbulent motion of the liquid thus contributing to the efficient mixing of the reagents.

We claim:

1. A device for pulsating mixing of liquid and liquid-and solid reagents, comprising a vertical tank for reagents to be mixed; and an inlet connection for filling said tank with reagents; an outlet connection for discharging reagents from said tank; a plurality of nozzles arranged in a row around the periphery of said tank, a first group of said nozzles having axes oriented tangentially to an imaginary surface of rotation with an axis to produce a unidirectional rotary motion of the liquid in the tank around said axis, while the remaining nozzles constitute a second group having axes radially oriented towards said axis to prevent the reagents from being separated under the action of centrifugal forces; and pulsating chambers disposed vertically around said tank andcommunicating with said tank via said first and second group of nozzles for vibrating and mixing the reagents filling the same in the course of operation.

.2. A device as claimed in claim 1, wherein said nozzles are all inclined with respect to the horizontal, downwardly into the tank.

3. A device as claimed in claim I, wherein the axis of the imaginary surface of rotation tangentially to which said first group of nozzles are oriented, coincides with the vertical axis of the tank.

Images