US2287854A

US2287854A - Coal washery

Info

Publication number: US2287854A
Application number: US254990A
Authority: US
Inventors: George L Arms
Original assignee: Jeffrey Manufacturing Co
Current assignee: Jeffrey Manufacturing Co
Priority date: 1939-02-07
Filing date: 1939-02-07
Publication date: 1942-06-30
Anticipated expiration: 1959-06-30

Description

June 30, 1942. G. L. ARMS X l COAL wAsHERY' Filed Feb. '7, 1959 f 4 sheets-shei 1 /NVE/VTOR.' 1 GEORGE LARMS;

" Maf-771.71m,

June 30, 1942. G. L. ARMS com. wAsHERY Filed Feb. '7, 1939 4 Sheets-Sheet 2 June 30, 1942.' G. L. ARMS COAL wAsHFM Filed Feb.` 7,' l1959 4 Sheets-Sheet 3 vif' /fyl/ENTOR GEORGE LARMS, BY 1 0L. 7n 7/)W June 30, 1942; Q 4ARMSl 2,287,854

COAL wAsHEBY A Filed' Feb. 7, 1939 4 sheets-sheet 4 f/v VEN TOR.'

, GEORGE I -ARMs/ AZT'Y Patented June 30, 1942 ooAL WAsHEfRY George L. Arms, Columbus, Ohio, assignor to The Jeffrey Manufacturing Company, acorporation l of yOhio Application l'february 7, 1939, Serial No. 254,990

This invention relates to a complete self-contai'nedicoal washery.

An object of the invention is to provide a cornplete Vself-contained washery unit which can be readily installed and which will eiciently clean coal or other material.

A Yfurther object of the invention is -to provide a compact and extremely simple though entirely complete coal washing unit.

Other objects of the invention will appear hereinafter, the novel features and combinations being set forth in the appended claims.

In the accompanying drawings:

Figs. 'l and 2 placed endto end comprise a side elevational View of the unit comprising my inveni tion;

Fig. 3 is a plan vievv of the unit; Fig. 4 is a front end elevational view of the unit; and

Fig. 5 is asectional View taken substantially on the line 5 5 of Fig. Y1 looking in the direction oi the arrows. Referring `to the accompanying drawings it will be seen that -I have provided a complete-seli-contained washery particularly adapted for the vcleaning of coal, though its use is not so limited. This washery unit comprises a main frame Iii upon which is 'mounted a jig II which, in the illustration. is a single compartment jig though a multiple compartment jig may be employed if desired. The jig l! may be of any desired construction and lfor example, may follow the construction 'of the jig disclosed in Patent No. 2,132,750 Vfor a Jig, to Ernst F. Muller, vdated October 11, 1938, though as above stated, the jig II is l a single 'compartment jig while the jig of the patent is a two compartment jig.

Brieiiy described, the jig Il comprises a base at lI 2 which is rigidly attached to and forms a part of the main frame ii). Extending upwardly from the base E2 are angle uprights I3 upon which is supported a tank iii. The tank llihas a receiving lip or chute I5 adapted to receive the raw coal to be cleaned. and a discharge chute I6 adapted to discharge the clean coal with an appreciable amount of water.

As is disclosed in full detail in the above mentioned patent, within the tank i4 there is a reciprocating diaphragm which is mounted on the top of a piston rod Il which works in a balancing cylinder it! supplied with air under pressure to counterbalance at least in part the weight of the liquid on the diaphragm. The mentioned diaphragm is reciprocated to effect a pulsating movement of the water through a screen 23 in tank I4 to Yeffect a stratication of the raw coal With the refuse on the bottom and the clean coal on the top, the latter flowing from tank I4 by way of chute I as the cleaned product. This recipro'catory'motion is provided by virtue of connecting rod means I Sadjustablymounted on Vrocking beam 20 which is pivotally'attached to a bracket 2I carried by channel means 22 which channel means 22 also support the cylinder I8. The rocking beam 2i) is provided with a roller 23 adapted to roll between parallel surfaces of a double acting cam Zliwhich is rotated'by a driving motor 25.

The jig I-'I is also provided with an automatically operable refuse control mechanism including float operating mechanism 26 which controls refuse ejecting mechanism 2l to maintain Ythe refusel on the screen `28 at a predetermined depth, as disclosed in full detail in the above mentioned patent. The jig I'I also includes a refuse elevator 29 which is operative to remove the refuse discharged by the mechanism 21 into the boot of said elevator 29. Elevator 29 also includes ,a separate drive means including electric motor 3i) land appropriate speed reducing drive mechanism `3l.

Also mounted on the main frame lil by angle uprights 32 which form a part of said main frame It is a dewatering screen 33 which slopes downwardly in a forward direction and which is provided with a receiving chute 34 adapted to receive the clean coal and water from the discharge chute l5 of the jig I I. The dewatering screen 33 is provided with a perforated bottom plate or screen cloth 35 of relatively ne mesh to the end that the water which is received by the dewatering screen Y33 may freely pass through the openings in saidrplate 35 while substantially all of the coal is discharged over the discharge chute .'55 at the lower end of'said dewatering screen 33.

The dewatering screen 33 is mounted for reciproeation on pairs of forward and rearward arms 3l' and 3S, respectively, and is reciprocated by an eccentric mechanism 39 driven by an electric motor 48. Y A

Positioned below the ,dewatering' screen 33 and between the uprights 32 is a Water classifying, settling or sludge tank 4I.

Adjacent the lefthand end of the sludge tank @I there is formed a clean Water or pump `snmp 42 which is formed by a transversely extending bailie plate 43. Extending` longitudinally forwardly from the baiileplate 43 is a plurality of skimming or d'ecanting iiumes or troughs 44, each closed at slope downwardly to the openings 43 and each upper edge of each trough presents a relatively long effective horizontal Weir over which the water in the tank 4I flows in delivering the clarified water through said openings 43' to the sump 42. The closed ends of the troughs are supported by the cross-piece 44' (Fig. 2) between the walls of the tank 4 I. This decanting mechanism has a very desirable feature in that the water velocities in the tank 4I, due to the fiow into fiumes or troughs 44, are very low, thus allowing for ready settling in the tank 4I of any fine material which comes through the perforated bottom plate 35 with the water.

This decanted or clarified water is used continuously for the operation of the jig I I by being recirculated by pump 45 provided with inlet pipe 46 which leads to the bottom of the sump 42 and feed pipe 4'I which leads to the tank I4 of the jig II and is controlled by hand operated valve 48. It may be stated that the pump 45 is driven by an electric motor 49.

To guide the water and any small particles of coal which may find their way through perforate bottom plate 35 into the tank 4I, preferably at a position to the right of the flumes or troughs 44, I provide a stationary hopper 5I! which is rigidly attached to the uprights 32 and which is positioned below the entire perforated portion of the bottom plate 35 and delivers the liquid and contained small particles of coal through an opening 5I near the head end of the tank 4I, as clearly illustrated in Fig. 2 of the drawings.

The function of the settling tank 4I, of course, is to allow the small particles of coal received thereby to settle out while decanting the liquid from said tank 4I, as above described, thereby clarifying the water for recirculation through the jig II. It is, of course, necessary to remove the settled sludge from the tank 4I which is formed by the settling of the small particles of coal or other material and to this end the forward wall 52 of the tank 4I slopes, as is clearly illustrated in Fig. 2 of the drawings.

Within said tank 4I I provide a scraper conveyor 53 which travels over substantially the entire bottom of the tank 4I and conveys the material up the inclined or sloping wall 52, discharging it over a discharge lip 54. Scraper conveyor 53 is provided with an appropriate electric driving motor 55 and speed reducing driving mechanism 56.

It is evident that I have provided a very compact and completely self-contained washery particularly adapted to wash coal and separate the pure coal from the refuse such as pyrite, shale and bony coal. The unitary construction, particularly with the compact arrangement of the principal units makes for a minimum of over-all space and a minimum of complication of the washing unit.

In the operation of the unit raw coal to be treated and cleaned is fed to the jig I I by way of lip or feed chute I5. The repeated upward and downward movement of the Water in the jig I I is effective to stratify the raw coal with refuse in the bottom stratum and coal in the top stratum. The automatic float operating mechanism 26 continuously determines the depth of the refuse stratum and accordingly controls the refuse ejecting mechanism 21 to maintain this stratum of refuse at a predetermined depth within relatively narrow limits. 'I'he cleaned coal or upper stratum, along with flowing water, flows from the jig II by way of discharge chute I5 and is received by the dewatering screen 33 by way of receiving chute 34. The discharged refuse is carried away to any desired point by the refuse elevator 29.

The clean coal and water, upon being received by the dewatering screen 33, which continuously vibrates, is separated with the water passing downwardly through the perforate bottom plate 35 of said screen 33, and the coal substantially free of water is discharged over the discharge chute 36 into any desired receptacle, conveyor, hopper, or merely in a pile. The water in passing through the perforate bottom plate 35 will inevitably carry with it some fine particles of coal which, with the water, are guided by the hopper 50 and discharged near the forward end of the settling or sludge tank 4 I.

Within said settling or sludge tank 4I the coal particles will settle to the bottom, the skimming or decanting troughs or flumes 44 receiving the clarified water and delivering it to the clean Water or pump sump 42. The pump 45 operates to recirculate the cleaned water by delivering it from sump 42 to the tank I4 of the jig II. The settled sludge in the tank 4I is removed by the conveyor 53 which may be operated either continuously or preferably periodically to scrape the sludge therefrom and discharge it over the discharge lip 54 into any desired receptacle, conveyor or hopper.

Obviously those skilled in the art may make various changes in the details and arrangement of parts without departing from the spirit and scope of the invention as defined by the claims hereto appended, and I therefore wish not to be restricted to the precise construction herein disclosed.

Having thus described and shown an embodi- 'ment of my invention, what I desire to secure by Letters Patent of the United States is:

1. Coal washing apparatus comprising a unitary main frame, a gravity separator xed to said main frame at one end thereof, a settling tank fixed to the opposite end of said main frame, a dewatering screen supported by the side walls of said settling tank, a chute connecting said separator and screen for delivering the overflow from said separator to said screen, means for delivering the liquid passing through said screen to the end of said settling tank opposite said separator and a conveyor mechanism in said settling tank for collecting and dewatering the settleable solids contained in said liquid. the coal passing over said screen and the solids removed from said settling tank being delivered at the saine end of said frame and in juxtaposed position.

2. Coal washing apparatus comprising a unitary main frame, a liquid gravity separator fixed to said main frame at one end thereof, a settling tank fixed to said frame at the opposite end thereof from said separator, a dewatering screen carried by said settling tank in a plane above said tank, means to deliver washed coal and the overflow liquid to said screen, means to deliver the drained liquid into said settling tank at the end thereof opposite said separator, means to deliver the clarified eluent from said settling tank into a clear well adjacent said separator and means to collect and dewater the solids settled from said liquid in said settling tank and deliver them at a point juxtaposed to the end of said screen.

3. Coal washing apparatus comprising a unitary main frame, a jig fixed to said main frame at one end thereof, a settling tank fixed to said main frame at the other end of said main frame, a dewatering screen positioned above said settling tank and supported thereby, means on said jig to pass the overflow including the cleaned coal onto said screen, means carried by Ysaid frame to vibrate said screen, means below said screen and above said settling tank to collect the liquid passing said screen and deliver it to one end of said tank, means in said tank to eolleet and dewater the settleable solids contained in said liquid and deliver them to a position juxtaposed to the coal delivery end of said screen and means carried by said main frame to recirculate the clarified liquid from said settling tank.

GEO. L. ARMS.