US832248A - Ore-roasting furnace. - Google Patents

Description

No. 832,248. PATDNTBD 00T. 2, 1906.

D T. EDWARDS.

ORE ROASTING PURNACE.

APPLICATION FILED 13110.19. 1903 Z SHEETS-SHEET l.

MV l? AV //Iv MVV' A? PATENTED OCT. 2, 1906.

T. EDWARDS. 012B ROASTING PURNACE;

APPLICATION FILED DBO. 19. 1903.

UNITED sTArns PATENT OFFICE.

THOMAS EDWARDS, OF BALLARAT, VICTORIA, AUSTRALIA.

oRE-RoAsTING FURNACE.

Specification of Letters Patent.

Application Bled December 19, 1903. Serial No. 185,883.

ratented'oct. 2, 190.6.

This invention relates to roasting-furnaces whereby copper ore, pyrites, matte, tin ore, antimony ore, quartz, and varlous othersullid ores and other compounds may be efficiently and economically roasted, and, if de-l sired, chloridized.

to reverberatory furnaces, so that coarse or finely-divided ores may be suitably roasted by mechanical rabbling.

'lhe furnace may be made of brick, stone, or iron, lined with brick or other suitable matcrial, and can be made of anysuitable length or wid th.

In a long reverberatory furnace a single line of rotary rabbles restricts the width of the hearth or desired width of the furnace, but yet necessitates a long foot to the rabble.

The great circle described by the oint or eX- treme end of the foot 0f the rab le necessitatcs the application of great force to push the rabble through the oreon the hearth from its central spindle, which causes more or less breakages of the rabbles and consequentloss of time. At present the rabbles used are of great weight and unwieldly to remove fromV and to replace in the furnace and are costly in construction. In my present invention I do away with the obj ectlonable feature of the long rabble-foot by replacing theI single line of rabbles with two or more parallel lines of light and short-foot rabbles, which are easier to handle and cheap in construction, possessing great durability and immunity from breakages.

The invention consists in the features and combination and arrangement of arts hereplan view wi th part of the furnace-Wal brokenv away. Fig. 3 is a cross-sectional view through the furnace with parts in elevation. FfigsA, 4a, and 4P show detail views of one of Figs. 5, 6, and 7 are detail Fi .2isaviews of the box through which the rabblearms are placed in or removed from the furnace, Fig. 7 beinga section on line 7 7 of Fig. 5.

In a long reverberatory roasting-furnace of Vvarious inside widths I provide, as shown in Figs. 2 and 3, two lines or more of a series of lateral oblong holes 1 through the arch or roof of the furnace, into each of which holes I insert an iron frame 1, Figs. 5, 6, and 7, and after which the openin is closed by clay or other suitable materia ,which prevents air` passing into the furnace when at work, and

. through which frames are inserted the feet 2 My improvements are made in and relateof the two separate lines or series of rabbles and from which they may be removed and replaced when warm.

The rabbles may be made of iron or any suitable material, the spindles 8 of which will protrude above the arch 4. On each spindle of the rabbles will be fitted a collar 5 and a cog-wheel 6. I also provide framework 7, securely xed above the arch of the furnace, which may be made of iron or other suitable material. To this frame are fitted the bearings 8, into which the spindles of the rabbles are placed, and thus the two series of rabbles with their cog-wheels are held in proper position to be rotated. On the top of this framework 7 I place two or more lines of shafting 9, fitted with cog-wheels 11, which shafting rests on bearings 10, secured tothe framework 7. The pinions 1 1 on the shaft are now geared into their respective crown-wheels 6, on the various rabble-spindles. These shafts are connected by gearing 12 26 to make the shafts run at a uniform speed, so that the feet of one series of rabbles cuts the circle or path of the other series, while each series cuts its own circles or paths of the rabbles, thus preventing the various rabbles from coming into contact or fouling each other.

I provide air-holes 13 along each side of the furnace, a little ,above the hearthH, through which air may be admitted in proper quantities to oXidize the roasting ore. The circles and arrows, Fi 2, show the various paths of travel. This ure also shows the air-holes 13 along the sides and the roasted-ore-discharge hole 17, the fire-bridge 18, and iire- Ilo of, as at b, within the foot, both parts a b being preferably integral with said footi The adjoining parts of the stem or spindle of the rabbles are cooled by a'constant stream of Water flowing througlirthe same, the waterV being conducted to the rabbles by the pipe 27, While the water is discharged from them Viinto the annular pan 22 andi is carriedi away "by the pipe 28. 'Ilhusthe passage for the ,ore for the smelting-urnaces.

water. is ormed'in the solid! iron through the stem and foot of the `rabble, doing away with the introduction of a pipe into the foot of the` rabble, which is always unsatisfactory. The water is introducedi through the top of1 the spindle andL passes down through the stema and returns by way of the-passage b through the foot and escapes through the outlet-pipe `in the stem of the rabble just underthe ange into 'the annular waste-water pan. There arebut twol'ongitudinalflines orseries of rabbles shown `in the drawings as an example;

but this does not limit the application of this principle of applying any number of lines .or series oi rabbles to` long reyerberatory furnaces, as the width of the furnace must be accommodated with the necessary longitudinal lines or series of rabbles.-

The-rabbles are arnanged so that the middie of-'the-furnace-is stirred twice, each line-ef` rabbles sweeping the ore in the middle to'- ward the fire end, While the sides of the turnace are only stirredf. once, so that the oreis drawn from the feed end" Without having an inclined hearth; but this can also bearranged tewerk equally well on the inclined hearth. 29 is a recess formed in the hearth of the furnace close to the fire-bridge, into which the rabble discharges the roasted ore fromthe hearth. This is used when roasting fine The object of the recess is to store up suiiicient ore while bei kept very hot to be drawn off at intervals into a. mechanicall press or iron pots and ressed therein While hot. This when cooled ecomesa concrete mass. Thus, little or no 'ne ore canI be blown7 into the l'ues ot the smelting-furnaces as dust.

In smelting operations ore containing more than; five percent. of sulfur must bve roasted, and to doy this eX editiously and well the oremust be crushe fine, so .that it will pass through a sieve the mesh of which varies from four holes to sixteen holes totheinch. This fine roasted ore ifput into the cupola smelting-urnace would be blown, by

' means et the necessarily strong blast of air,

into the flues, and little or none of' the ore 'would-- beY smelted. :To obviatethis diiculty, it has been found necessary to leave from-two per cent. to three per cent. of sulhearth, and two` lines otrabbles extending.'

longitudinally of the furnace andIv rotating fur in theoreand while it is very hot todraw the ore from the furnace into iron potsor pressedr escasa molds, into which the hot ore is pressed or hammered7 so that with the small amount of sulfur contained in: the ore it becomes coagu lated'. Hence, being in lumps, it resists the action, of theair-blast and is not blown out of the smelter. i

The recess is', as shown, close to the bridge 'or hottest place of the furnace, in which the orev is discharged; from the hearth, which remains in the heat until there is suiicientore to ill an iron ot or mold, when it is drawn by manual l'a or or mechanical force from 'the furnace into the molds, andthe desired object iis-obtained?. Vnot be assured: without therecess, as the ore This saie object could 'would be drawn out little-by little, When-'the ore would become too coldibeforeit could be The recess is used only when-,roasting for smelters, and. the ore` willf be drawn out through the side ofi the fumace-at 29a.

I would point out that the twol or more separatelines or series of; rabbl'es may be rotated by other means than by alongitudinal 'line-shaft to each line or seriesof rabbles.

It will benoticed that the rows of elongated' openings are arranged out beyond the lplane of the line-shaalts,v andi that the discharge-pipes 28. occupy positions between 'the lines of rabble-stems. Ilt Willi be understood that the arrangement offthevelongated openings to extend transverselyy 0fthefur nace-is of advantage in that the strength of the arch is not lessened, aswould' be-the case werel theseopenings.'extendedilongitudinally of the-furnace.

` l claiml as my inventionm 1'. A water-cooled stirring-shaft provided with a partition dividing the shaft into two compartments, said' partition forming the end of one compartment, a Stirner-arm, and means connected to` the sturen-:arm for providing circulation through the arm and shaft.

2; A rvmteo-cooledstirringeshaft provided withax partition di viding thel shaftinto two parts, one part being closed. on the top and provided* with a pipefor lthepassageofwa,- ter.

3f. A water-cooledstirringshat diyided'by a lmrtition-7 a stirrerearmattached to said shaft, a partition ini the st'imicnarm, an open ing at .the end of said-latter partition, means for admittin lwaterinto.onepart of theshaft and meansr permitting the outletof the waterromthe other part ot the shaft.

4. An ore-roasting furnace of elongated IOO IIO

formocm aheartltandi a plurality of themv toward theirey endi of= the furnace, substantially as described.

5. ore-roasting furnace comprising a over the hearth, the circular paths of the rabbles intersecting each other laterally of the furnace, lsubstantially as described.

6. An ore-roasting furnace comprising an elongated hearth and a plurality of lines ofl rabbles rotating over the said hearth, the paths of movement of said rabbles intersecting each other both longitudinally and laterally of the hearth, substantially as described.

7. An ore-roasting furnace comprising an elongated hearth and a plurality of lilies of rabbles rotating over the said hearth, the paths of movement of said rabbles intersecting each other both longitudinally and laterally of the hearth, two lines of shafting extending longitudinally of the furnace, gearing between the said shafting whereby they move in unison and gearing from the said lineshafts to the rabbles, substantially as described.

8. In combination in an ore-roastin furnace, an elongated hearth, a plurality o lines of rabbles rotating over the hearth, and

, elongated openings extending from the rabble-stems laterally toward the edge of the furnace-arch through which the rabble-feet may be introduced or removed.

9. In combination in an ore-roasting furnace, an elongated hearth, a plurality of lines of rabbles rotating over the hearth, and having their stems extending up through the arch of the furnace, a plurality of line-shafts extending longitudinally of the furnace above thearch, gearing between said lineshafts and the upwardly-extending stems, Water-pans surrounding the stems, dischargepipes for the water extending longitudinally over the arch between the rabble-stems and openings for the placing or removing of the rabbles, said openings being located out beyond the longitudinal plane of the line-shaftsI and extending from the, rabble-stems toward the side edges of the furnace, substantially as described.

10, In combination in an ore-roasting furnace rabbles and means for driving the same, said furnace having elongated openings in its arch with their long dimension extending laterally of the furnace for the introduction of the rabble, substantially as described.

I11. A Water-cooled stirring-shaft having a stirrer-arm, a partition extending longitudinally of the said shaft, a partition extend ing longitudinally of the said arm, said arm and shaft being integral and the partitionsl being integral with each other and with the shaft and arm respectively, the said integral partition forming one end of one compartment in the shaft, the inlet and outlet for the water being at the upper part of the shaft.

12. A water-cooled stirring-shaft having a stirring-arm and a partition extending from side to side and along said shaft and arm, said e shaft having the inlet and outlet for the water at the upper portion thereof, whereby a circulation is secured down one side of the ishaft, along one side of the arm, returning along the other side of the arm and up the other side of the shaft,

In testimony whereof I aflix my signature in presence of two witnesses.

v-THOMAS EDWARDS.

Witnesses:

EDWARD W. KENT, RALPH R. WRIGHT.

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