US1445935A - Agitator - Google Patents

Description

Feb. 2-9, 1923. 1,445,935

A. C. DAMAN ET AL AGITATOR Filed NOVv l, 191'? /8 INVENTORS A. C. DAM AN. 7 AND TJ. PENNINGTON 2/ ATTORNEY Patented Feb. 20, 1923.

, OF'DENVER, COLORADO, AND THOIVIA NAUGATUCK, CONNECTICUT.

AG-ITATOR.

Application filed November 1, 1917. Serial No. 199,682.

To aZZ 'wIwm it may concern 1 Be it known that we, ARTHUR C. DAMAN,

county of New necticut, citizens of the United States, have invented certain new and useful ments in Agitators, of which the is a specification.

terial under treatment is a desideratum.

ur improved agitator is well adapted for use in flotation ore concentrating processes in which finely ground ore-pulp together with a certain percentage of oil is subjected to violent agititation to produce y the introduction of air and through agitation, a froth composed of bubbles of oil and air in which the mineral particles of the ore are entrapped.

The primary object of our invention is to provi e an agitating appliance which during its operation, automatically induces an influx of air into the material under treatment.

To the above and other ends which will hereina er appear, our invention consists in the PIOVlS-IOIL of a rotary stirring the device movement, and the inlet of which connects with a scoop for the entrance of air which is drawn in by compression within the scoop as well as by the displacement of liquid roduced during the rotary movement 0 the device.

The device is preferably provided with means adapted to increase the degree of produced by its rotation and an adjustable contrivance is connected with the agitating device to regulate the inflow of air to any desired amount.

An embodiment of our invention in its .preferred form is illustrated in the accom- Improve- V th following panying drawings wherein like characters of reference, indicate coresponding parts in the various views and in which F igure 1 represents a vertical section through acontainer equipped with our improved agitating apparatus,

igure 2', a trans-verse section taken along e line 22, igure- 1,

igure 3, a similar section along the line Figure 1, igure 4, an enlarged sectional View through the upper portion of ance which regulates the flow outlet ports,

igure 5,-,a fragmentary sectional view through the stirring device at the lower end of the agitating appliance, and

Figure 6, a sectional view .of a modified form of the scoop included in the construction.

Referring more specifically to the drawings, the reference 7 container which may be of any suitable size and form although for the purposes of the present invention a cylindrical vessel is pre ferred.

'The vessel has in its bottom a central opening connecting with a through Which the ore pulp or other finely A tubular shaft 4 container from a suitable superposed bearby connection with a convienentlylocated motor.

The rotary shaft has at a point above the level of liquid in the container, one or more inlet-ports 7 which connect its bore with a' conduit 3 I During rotation oftheshaft in the direction through the op Secured to the lower end of the shaft adjacent the bottom of the container 15 the stirring device 9 which in its preferred j the arms whereby to ment ment during their rotation.

' plian ce,

form consists of a plurality of impelling blades or arms 10 which radiate from a hub 12 into which the shaft is fitted.

The arms which are wedge-shaped in cross section are hollow and open at th ends; they are connected with the bore of the shaft by means of egress ports 13 .at the lower end thereof and they are provide in their faces rearward with relation to the direction of rotation of the element. with longitudinal slots 14 through which the air entering the scoops at the upper end of the shaft, is forcibly ejected into the material under treatment. I

The arms are connected by webs 15 which cover the spaces between them and aidin the charge by preventing the above the arms to by liquiddisplacehe webs whose upper surfaces lie in a common plane, I necessary to move the arms f material in the vessel bypreventing the aerated material from reentering the spaces between aeration [of the flow of vmaterial from enter the spaces caused them.

' The open lower end of the shaft is normally closed bga threaded bushing 16 and a screw-plug 1 When these parts are removed a portion of the material introduced into the container through the conduit 3, ma enter the bore of the shaft tobe discharged through the slots and open ends of,

more .thoroughly im- 1 with the air. 18 at the lowerend of a threaded stem 19 which works in acorrespondi'ngly threaded spider-bearing 2O atthe upper end of the tubular haft, cooperates with a seat 21 formed within the bore of the same at a point between the inlet ports 7 and the egress. slots '14, to regulate the flow of air. The compression produced at theingressopening of the shafts may be increased y providing scoops 24 of spiral form as shown in Figure 6 of the drawings.

Having thus described the mechanical construction of our improved agitating apit will be noted that during rota tion of the element in the direction of the' arrow 0 in- Figure 2, the compression produced in the scoops, and theliquid displaces produced between the impelling arms I,

- beneath the disk 15, cause rapid downward flow of air through'the.bore of the shaft.

produced between the arms 0 I shaft projecting thereinto and The air which is forcibly ejected through the slots of the arms is di used through the continuously agitated material introduced into the vessel through the conduit 3, with the result that a thorough intermixture of the air and material is obtained.

The froth produced by the aeration and agitation of-the material, entraps the metallic yalues and together with the unaifected gangue, rises tothe surface ofthe liquid the level of which is in the construction shown in the drawings, determined by the upper edge of the container across which the supernatant matter overflows into a conveniently disposed receptacle.

Incase the apparatus is use in a process of concentrating ores by flotation, a percentage of oil may be introduced into the upper end of the tubular shaft through a pipe 22 or by other convenient means, an intermixed with the air and finely divided ore to form afroth in which the mineral constituents of the ore are entrapped.

Inorder to. expedite the impregnation of the pulpwith the air,- the end of the shaft may be partially or completely opened by removal of the plug and bushing to admit a small quantity of material to the interior of the impelling arms.

The arms are open at their ends to prevent clog ging of their longitudinal passages; the amount -of air entering the material through their slots is regulated to any desired. degree by adjustment of the valve 18 which to this end is provided with a hand-wheel 23, and the liquid displacement f the agitatdrawn into ing device by which the air is and through the tubular shaft, is materiallythe provision of the dlsk 15 promoted by the radiating and by the wedge shape of arms.

is susceptible of variations in the construc- 'Having thus described our improved agition and arrangement of its parts without any materlal departure eiple and natureo fined in the following-- claim:

In an agitating apparatus ore-com :e ntrating processes, the combination from the true prinfor I flotation the invention as del of an ore-pulp tank having a t i jowerfiendf,

an ore-pulp inlet, a rotatabl having an.

air-inlet exteriorly thereof and an air-outlet interiorly thereof, anjore-pulp agitating and air-distributing'member' carried by said;

- shaft, adjacent to and communicating with said ore-pulp inlet, and comprising hollow arms radiating from said shaftand com municating, at one end, with said air-outlet, a disk ncentrically carried by saidv I shaft immediately above said ailns, each of fixed our signatures in the presence of two said arms having, in its rear Wall, a longiwitnesses.

tud-inally-extending air-egress slot, and ARTHUR C. DAMAN,

having its front Wall dbwnwardly and for- THOMAS J. PENNINGTON. 5 Wardly inclined, therebyfimparting to the Witnesses for Daman:

pulp entering the tank an upwalzd m0ve-- Y. CALDWELL,

, L. RHOADES.

disk, facilitating the mixture of the air Witnesses for Pennington: with the pulp. G. H. ENNETT, Jr., 10 In testimony'whereof we have hereunto af- E. E. BOOK.

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