US653684A - Metallurgical filter. - Google Patents

Description

Patented July I7, |900. F. H. LONG.

METALLURGICAL FILTER.

(Application led Nov. 6, 1899.)

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No. 653,684. Patented July I7, |900. F. H. LONG.

METALLURGICAL FILTER.

(Application filed Nov. 8, 1899.)

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UNTTED STATES PATENT Orman.

FREDERIC H. LONG, OF CHICAGO, ILLINOIS, ASSIGNOR TO ROSS J. BEATTY,

TRUSTEE, OF MUNCIE, INDIANA. Y

METALLURGICAL FILTER.

SPECIFICATION forming part of Letters Patent No. 653,684, dated J' uly 1'7, 1900.

Application led November 6, 1.899.` Serial No. 736,008. lllo model.)

To @ZZ whom it 717/601/ concern:

Be it known that I, FREDERIC H. LONG, a resident of Chicago, Cook county, Illinois, have invented certain neT and useful Improvements in Metallurgie Filters, of which the following is a full, clear, and exact description.

In Wet methods for extracting metals from their ores by aid of proper solvents the refuse gangue left at the close of the extraction stage necessarily retains a notahlepercentage of rich solution. Under careful washing and filtration of the gangue this associated solution is oftentimes'recovered and utilized.

The present invention seeks to provide an apparatus primarily suited for rapid treatment of the refuse gangue, a charge thereof, together with the residual solution which accompanies it, being repeatedly Washed under hydrostatic pressure to promote rapid filtration of the solution, while the charge is maintained in active circulation to insure thorough cleansing, and as Well to prevent banking of the dense slimes against the filter medium or septum.

The nature of the invention will appear in detail from the description following and be thereafter more particularly pointed out by claims at its conclusion.

On the drawings like parts bear like designation throughout.

Figure 1 displays one form of the improved apparatus in longitudinal vertical section; Fig. la, a plan view of the filter-hopper detached and inverted; Fig. 1b, a detaillongitudinal section view of the pump-plunger and its rod; Fig. 1C, a top View of the plunger and its Valve-cage; Fig. 2, another form of the ap paratus in longitudinal section, the external pump and the pipe connections being shown in elevation; Fig. 2", a detail front View of the centrifugal pump, Fig. 2.

In the device shown by Fig. 1 the lter vessel comprises a body 10, with head 11 and sloping bottom 12, all of sheet metal. The body and head are permanently riveted or otherwise fastened together, whereas the sloping bottom detaches from the body, but is anged, as shown, and tightly bolted in place at the edge ring 4:1 Wood lining 13 protects the `-vessel interior from corrosion.

For the purpose of agitating the charge, so as to thoroughly expose it to the rinsing effect of the Wash Water, the vessel is furnished With an internal pump mechanism properly arranged to compel a forced circulation of the vessel contents. The pump acts to prevent banking of the slimes, and thus keeps the filter clean for persistent separation and removaloftheclearliquid. An uprightwooden 6o penstock 14, with strengthening-hoops set at intervals thereon, rests upon the inturned edge of metal bottoml2, gasket 9U being interposed to close the joint, While space-rings 89 91, in conjunction with the filter-hopper 85, 65

afford a step-bearing to steady the penstock in place. At its top the penstock centers about the ledge of a depressed cap 1G, seated in a hole of head 11. rThe flange of cap 16 sustains the feet of cross-head 17, both parts 7o being secured in common by bolts 18 to the top of the vessel. Cross-head 19, carried by guide 17, receives its motion as by pitman 20 and wheel 2l, thus reciprocating the plungerrod 22, which passes through stuffing-box and gland 23 at cap 16 and by its lower end sustains the pump-plunger 24.

As seen at Fig. 1b,tne reciprocating pumprod consists of a wooden sheath 22, incasing a central metal stem 25, fastened above by 8o nut 26 to cross-head 19 and by gutta-percha nut 27 beneath to plunger 24, made of like material. Rubber gaskets 28 encircle stem 25'at the severaljoints to exclude liquid.

`Threaded Within plunger-24 is the gutta-per- 85 cha cage 29, upon which seats the gutta-percha valve 30. A gutta-percha liner 31, fastened to penstock 114, affordssnug bearing for the packing of plunger 2i.V The linereX- tends below pastthe' inturned edge of metal 9o bottom 12 and aids in centering and steadyingthepenstock beneath. IIard-ru'bbervalve d seats against Wooden liner 35, which in conjunction With companion giitta-percha liner 36 acts to protectthe metal-exit 37 bolted to 95 bottom 12.

The sloping bottom 12 detachee, as by bolts 41, from the body of the filter to afford access to hopper S5, sustained out of contact with the surface of bottom 12 by Wooden suploo ports S6. Hopper is perforated, as shown, and carries a cotton-duck or canvas cover 87,

stretched in place by rim-hoop 8 8 above and by space-ring 89,. inturned lip of bottom 12, and lower terminal of penstock 14 beneath.

Outlet-pipe g, controlled by cock or valve, aords a regulated exit for the accumulated filtrate. The gangue or other material to be treated is supplied at intervals through feed.- pipef. A vent-pipe f2 enables the confined air or gases to escape at the inflow of the charge or later on during the run. The pipe is ordinarily closed by suitable cock, so that the vessel being completely filled with the semiliquid charge com pactly confines its contents, eXcept for ventage of the filtrate at outlet g, while the wash-Water acts in hydrostatic column to exert its pressure in aid of rapid filtration. For such purpose the water-supply pipe 8O is fastened into the top of the vessel and leads thence overhead to some convenient storage-tank (not shown) or other reservoir. Valve 82 and cock 83 govern the inflow, and are thus employed in duplicate, so that should either one become disarranged the other may then be caused to act instead for sh uttingo or regulating the feed. Main valve 84 admits Water to pipe 8O or else can be used to drain thestorage-reservoir through waste tap-pipe 80a should the cock therein be left open for the purpose.

For agitating and circulating the slimes during 'filtration the pump can beinternal or else, as shown at Fig. 2, may be arranged Outside of the filter vessel, although in closed Connection therewith. The external location of the pump renders it easily accessible and, besides, enables the pump to quickly empty the vessel of its contents. Many of the parts already described appear again at Fig. 2 and need not be dwelt upon further.

The casing A of the centrifugal pump attaches at its inlet-eye to the elbow-pipe d. which is tightly secured at the apex of the vessel bottom and opens t-hereinto just above the filter. The exit-port of the pump connects with return-pipe b, which latter rises externally up to the top of the vessel and is united for convenience to the gangue-feed plpef- To prevent seepage and as well to allow for easy rotation of the pump despite the hydrostatic pressure, the enlarged journal-box c for the pump-axle is fitted with a tube c', which extends upward for a distance approximately equal in height to the column of wash- Water delivering into the filter vessel. By such expedient the pressures at opposite faces of the pump are substantiallyneutralized and thev rotation thereof remains unirnpeded by side thrust and resultant. friction.

The pump Works in familiar fashion, constantly withdrawing the mixed slimes and liquid from the vessel'bottom and delivering them anew into the top, maintainingthe.'

charge in a constant state of ux and agit-ation,while the wash-Water acts under pressure to cleanse the solids and to force the liquid past the iilter and out at exit g. On opening cock 100 and closing cock lOl the continued rotation of the pump speedily empties the vessel of its contents, the refuse being directed into any convenient Waste tank or dump. Cock 102 is merely supplemental and ordinarily remains closed While the pump is in action.

NVhile the apparatus is primarily designed for treatment of metallurgie gangues, it may be used to advantage in Washing paper-pulp or other like materials in semiliquidsuspension. The details of structure can be varied by the mechanics skill Without departure from the essentials of the improvement.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

l. The combination with the closed vessel having a filter-septum and an outlet-port for the liltrale beyond such septum, of the Washwater pipe connected in hydrostatic column with said vessel and suitable means for establishing a forced circulation of the Vessel contents, substantially as described.

2. The combination with the closed vessel having a filter-septum and a regulated outletport for the liltrate beyond such sept-um, of the wash-water pipe connected in hydrostatic column with said vessel and the external centrifugal pump joined at its separate sides in closed union with the opposite ends of the Vessel, substantially as described.

3. The combination with the closed vessel having a filter-septum and a regulated outletport for the filtrate beyond such septum, of the Wash-water pipe connected in hydrostatic column with said. vessel and .the external centrifugal pump joined at its separate sides in closed union with the opposite ends of the vessel; the journal-box for said pump-axle being furnished with a water-column pipe to counterbalance the hydrostatic pressure at the vessel, substantially as described.

FREDERIC H. LONG.

Tituessesz Louis M. GREELEY, JAMES H. PEIRCE.

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