US926942A - Roasting-furnace. - Google Patents

Description

H. A. HOGEL. ROASTING PURNAGB.

APPLICATION FILED JULY 27, `1905.

926,942. v Patented July 6,1909.

BSHBBTS-SHBET 2.

wirmmo y 4 L J ma H. A. HGEL.

ROASTING FURNAGE.

APPLIGATION FILED JULmv, 1905.

926,942, Patented July 6, 1909. v

3 SHEETS-SHEET 3.

@witnesses f ull, clear, an

nascar. A. Hoest, or Nswronn, N. Y.

l nonsrmemnacn.

specification o: netten Patent. Anuman mea :my s1, 19o. 'sum Np. avisos.

To all whofm'itmayoonm:

.Be it known that I, Hasen. A. Hosen, -a cltizenof the United States, residing vat New York, 1n the county of New York and State of New York, have invented certain new and useful Improvements in Roasting-Furnaces; and I do hereby declare the followin to be a exact description o the in ventlon, such as will enable others skilled in the art to Whil h `t appart-aine to make and use the same. f i

My invention relates to improvements in furnaces for treating ores, and is primarily designed to treat refractory suliid ores, more especially 4those containing sulfids of iron, lead, silver and gold, although it is not restr1cted to such ores, as any ore, no matter how complex and refractory, can be-successfully roasted in my apparatus and practically all of the valuable `constituents thereof separated from leach other and saved.

My roasting furnace contem lates the use l of heat, sulfur, oxygen and sa t, as hereinquiteeasil after described, upon the ores and contemplates the production of chloride of some of the metals contained in the ore, and vthe volatilization of the chloride so formed. The' condensation, separation and recovery of these chloride is effected by suitable means, as setiorth in an a lication of even date Serial No. 271,470, t e gold being recove as the pure metal, the silver as solid chlorid of silver, the. cop er in solution as a chlorid or sulfate and the ead `as solid sulfate of lead, the last com jiounds named being easily ref ducible, pro ucing the pure metals, silver, copper and lead.

t is well known that many chloride can be volatilized by the proper amount of heat an many attemps have been made to utilize this fact to recover metals from refractory ores, but, so far as I know, all these eorts have been either practical failures, when attempted to be carried out on a comm mercial scale, or else .attended with so much expense as to be prohibited from use. One reason for these failures, and the chief one,

inniy opinion, was the impossibility of obtaining suitable and econp lmethods and apparatus lor cond fumes, but this point is carefully provided for in the companion .application already referred to.

In the accompanying drawmgs z--Figure i is aside elevation of im improved furnace. Fig. 2 is an end view o ,the parts shown in center posts hopper lc, preferably so that it ordina-ry curved `bricks small recesses.

` the volatilized shelves discharge their Fig.. 1, looking from the left of this figure. Fig. 3 is a section of one of the furnace ends, and Fig. 4 is a cross section Aof one of the furnaces.

In a strong frame, or steel, are mounted furnaces b, c, d, and e, four. being'shown on the drawing. This frame is composed of upri ht end ptpsts a, cross beams f, with corner races g etween said posts and beams, y h, and diagonal braces i, the whole forming a rigidstructure in which the furnaces and other partsb are located.l In Fig. 4 2' inclined side bracing beams y' are shown on one side ofthe main frame and these may be used on both sides of said frame, if desired. The various pipes, hoppers, driving devices, &c are supported in or on said frame or extensions thereof.

7c represents ra hopper into which the ground raw ore is fed. rom the bottom of thishopper the ore is fed alon by the spiral conveyor m, driven by a be t ons rocket chain assin over the pulley or Whee n, and then rops t rough the i e l into the higher end ofthe upperlncline urnace, Where it is preferably made of iron any desired number of roasted, the spiral conveyer, packed with line v ore,acting as a stop to prevent the gases from assing out through the hopper. The ore is iely pulverized before it is led into the will pass throu h a 40 mesh sieve.

Eac of the furnaces is composed of a shell c, made of iron or steel, com osed of sections bolted together, Fig. 4, and ined with a fire brick construction, alternate rows being the p fire brick and the intermediate rows being nearly triangular in cross section, as shown at p in Fig. e, which serve as shelves to lift the ore from whence it is .spilled down to the bottom of the furnace,

t us insuring a thorough stirring of the ore. As will also be seen from Fig.. fl, 'the inclined, or longer sides of these triangular bricks p, form with the ends of the curved So that the said ends of the said curved bricks, constitute shelves of lesser dimensions, than do the bricks p. These, recesses, serve as lodging laces for small quantities of iilearticles o ore, and

these-lesser shelves lift t e same,.and finally discharge them, precisel as the larger arger quantities. By the use of my larger shelves at such frequent intervals, and also' by the use of the combination' of these two sets of shelves,

operating on different quantities of ore, l secure a much more thorough stirring of the same, than has been heretofore possible. ln the furnace b the ore is roasted, to drive 0H the larger part of the sulfur, incidentally forming a small ercentage of sulfates of some of the meta s present. l do not attempt, however, to carry this roasting operation to a dead roast, lor in such a case, it would be necessary to add more sulfur, as a small percentage of sulfur is needed to .per- Jiectly carry out my method.

'lo one end ol the lfurnace l; is attached a discharge pipe g, provided with a valve r, which pipe leads into 'a pipe s, supported on the top oi the main haine, which ipe leads away the sulfurous acid as toa su rie acid plant (not shown) in which this as is saved.

rlhe furnaces h, c, d, e are sim' ar in structure but are inclined in opposite directions, Fig. 1, and located in o posite angles of the main frame, Fig. 3, and as they are all continuously revolved, the ore slowly travels from the hop er lc back and forth through the furnaces untd) it is inally discharged through the pipe t, which is preferably provided with a screw conveyer (not shown) or similar device, to prevent any of the volatilized materials from escapin therethrough and going to waste, though t is is not absolutely necessary. Each furnace is provided with a plurality of llanges u, Fig. 4, each of which rests in two grooved rollers o. Each furnace may be provided with the usual raclr, with which a gear wheel, such as w, engages, or it may be revolved by turnin one ol the rollers v. These rollers and whee s are all mounted on inclined shafts, such as zu, to correspond lwith the inclination 0l the res ective furnaces. Any suitable means or rotating these furnaces ma be used. l have shown, for the lower two lurnaces d and e, a shaft y, mounted in one of the posts h and having a gear wheel z, which meshes with the gear wheel 1, on the shalt which rotates the lurnace c, a sprocket wheel 2, connected by a l sprocket chain (not shown) with the sprocket wheel 3 on the driving shalt for the l'urnace d, and a sprocket wheel 4l, which is driven by a s rocket chain (not shown) from a point some istance from the main frame. The means shown for rotating the furnaces b and c are similar in structure. llnto the upper end of the furnace c salt is delivered, by means of thehopper 5, screw conve er 6 and pipe 7, simllar 1n structure Vto' t e corresponding parts already described. lnstead, however, of using the furnace l; as a roasting furnace, l may use it as a volatilizing furnace, if desired,.likesthe furnaces vc, d, and e, the roasting being done in a separate, detached furnace, -in which case the ground and roasted ore, mixed with the proper percentage of' salt, would be fed into the ho per lc and the hopper 5 dispensed with. rorn the discharge end ofthe furnace b the roasted ore is delivered throu h the inclined pi e Sinto the receiving end o the furnace c, eing mixed with salt, as it enters. In this furnace c, the formation of volatile chlorids begins and under the action of heat, sulfur, salt and oxyen (air being blown into the `furnace, as hereinafter described) the reactions take place which eventually turn practically all,

(an inlet end) being shown in detail in Fig. '3;

lt consists of a metal cylinder 9, closed at one end and provided with a lining 10 ol lire brich or other refractory material. lt is also provided with an inclined shell 12, to; conduct the ore, falling from the furnace next above it, well into the end of the furnace'. A

brace 13 holds this shell hrinly. .The iur-i nace does not touchgthe end or cap 9 but is separated from it by an annular space 11 and to prevent any volatile material irom escaping throughthis space, instead l going over into the condenser, a steady current ot air or oxygen is blown through i, this annular space, supplying the oxygen needed lor the c emical reactions, preventing the 'volatile .materials from escaping and going to waste and creating a slight air pressurein the furnace, which aids in lorcnig the volatilized material into the condenser. '.lo eect these results an annular, flaring llangel is bolted onto the open end ol the end or cap 9 and to this dangle is bolted a curved annular piece 15, to w. ich in turn is bolted the annular piece 16, the parts 15 and ld being brought nearly together at their free edges, thus forming an annular tube provided with a narrow annular delivery slot, Fig. 3. 'lhe part 16 is provided with an annular flange 17, which comes close to, but not in contact with, the shell ot the furnace and with a shoulder 18 with which one edge ol the piece 15 engages. rlhe annular tube thus formed is connected by a valved pipe 19 with a pressure pipev 20, one ol these pipes vbeing located near each end ol the mem trame, these pressure pipes being, respectively, connecter by pipes 21 and 22 to a pipe 23 which delivers compressed air to the apparatus.

From each end of each of the volatilizing' furnaces c, d, and e leads a pipe, such as 24, povided with a valve, as 25, into a pipe, as

26 or 27, at either end of the furnaces.

,-of them has, as a usu v form of condenser may be used, `but I prefer zinc, this may be practically eliminated-durisisI the lowest furnace e, eit er as ne metallic the two. Both of these can be readily sepa- .posed of a shell' lined with refracto? .fire be ricks posed of a shell lined withrefractoig re ricks beingsubstantially triangular in cross sec-l ese,

the specification bei'ng du licated, one only thing, been described). The `pipes 26 andm27'deliver'the volatile products into a pipe 28, which leads into a` boiler, one end of which is shown at 65, Fig. 1. lhe volatile products are highly heatedoften up to 1800 F or more,and this. heat is utilized. to generate steam in the boiler, whichis used for any desired urpose, such as revolving the furnaces. is preliminary cooling, whichfhowever, must not be allowed to roceed far enough to permit any of the vo atilized products to be condensed in the boiler, also lightens the work of the condensin ap araturs.' After passing throu h the bo' ert e volatilized products are de ivered into a condenser. Any desired the form shown in the companion application of even date, Serial No. 271,469. Practically all of the lead, copper, silver and gold is saved in the condenser. If the 'ore contains ing the roasting operation land the zinc recovered or thrown away, as circumstances. dictate. If the ors contains iron, this will be discharged through the ipe t at the end of iron or as a magnetic oxid, or a mixture of rated from the g eand waste by amaignetic separator,'an the iron can then be recovered as metallic ironin the usual way. Many ores however, contain too small percent es o iron and zinc to warrant'the sav- 1' .g o these metals, especially in localities where labor, fuel, etc., are high, as is Ithe case in maplysections where these complex refrac-I torys d ores occur. The iron andzinc are therefore saved or allowed to go circumstances dictate. 4

Iclaim:- g ,l 1. In :iL-furnacer for the treatment of re-` fractory ores, a rotary roasting furnace comto waste, as

ricks, the alternate rows of saidire i substantially triangular in cross section ormi shelvesand recesses for the ore, substantia y as described. y. 2.. In a furnace for the treatment of fractory ores, a rotary roasting furnace comricks, the alternate rows of said fire4 tion and forming shelves, substantially as described.

3. -Inan apparatusfor Vthe treatment of refractory ores, the combination of an inclined open-ended rotary furnace, means for 4sup orting and rotating said fum a lstatEicnarycap foreach endof said furndce i said cap provided with an'inclined pressure into said furnace,

furnace being lined with fire brick, the alternate rows of which are approximately triangular in form and project farther toward the interior of the furnace than the intermediate rows forming shelves and recesses for the ore, and an annular air forcin device carried b each of said ca s, provide with a narrow s 't directed into t eopen end of saidcap,su bstantiall as describe Y .4. In an apparatus or the treatment of refracto ores, the combination of av suporting rame, a lurality of inclined rotary rnaces .carriedv y said frame, said furnace being inclined inl opposite directions'successively, whereb the ore may be easily passed from the 'gher end of the uppermost furnace, said furnaces bein mounted in a staggered position relative y` to each other on said frame,.a hopper rovided with an air closure arranged to eed into the upper end of the highest furnace, a ho per provided with an air closure connecte to jthe upper end ofthe second furnace from the top, means for revolving said furnaces, and stationaryv ca s' for each end of each of said furnaces, eac ca being provided with -means for forci air t ereinto, said furnace being lined'V wit rows of which are triangular and rectangular in cross section, substantially as vdescribed.-

-as described.

refractory ination of an in `ed rotary l furnace provided with open ends; of a stationa cap for each 'end o f said furnace, one o which -is provided with a feed pipe and an inclined shelf rigid therewith, and the other `of which is provided with a discharge pipe and with. an annular piperi therewith adapted to disc an each of said ycaps inclosing Voneend of said furnace but not in `contact therewith, substantially-as described.

ture, in presence of two witnesses.

Waimes? I S.- M. Paume,

anddis'charge L.- F. Davms. I

fire brick, the alternate 5. In an ap aratus for treatin refractory .8G most furnace to the lower end of the lowera gas outlet; an

the cor of the furnace without .dlg -air un er f

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