USRE12928E - Nesota - Google Patents

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E O A &u EU NP. OG .Jm B m nu 0 9 0 I A J D E L r. r. I 0 I T l o I vu I. P A

m M 4 v x m 4 V Z /M/ v 7 V 1 l T 4 OM fl 5 Reissed Mar. 16,1909.

UNIT D s Ar s rigrENT OFFICE.-

JOHN T. JONES, 01'` IRON MOUNTAIN, MICHIGAN, ASSIGNOR, BY-DIRE `T AND MESNE ASSIGNMENTS, T().JONES STEP-PROCESS l'OMPANY, A CORPORATION OF MIN- NESOTA.

on-snmmo FUBNACE.

S pecication of Beissued Letters Patent. Reissued March 16, 1909.

Original lo. 890382, dated June 9, 1908, Serial No. &07,772. Application for reiue filed Janaryfi 1909. r

. Serial No. &71,366.

To all 'whom it may co ncer'n.-

Be it known that l, JonN T. JoNEs, a citizen of the United States, residing at Iron Mountain, in the' County of Dickinson and State of Michigan, have invented a new and useful'lmp'ovement in Ore-Snelting Furnaces, of which the following is a specification.

The primary object of my invcntion is to provide a novel constuction of furnace, on the order of that -forming, the subject of United States Patent No. 866,2,80, granted to me September 17, 1907, whereby it shall be,adapted, more especially, to perform a seni-smeltin action, in the sense of melting `the slag-nia' ing constituents of the ore,

' tical section& elevation, with the upper portion of the ore-atack or,reducing-kiln broken away; Fig. 2 is a section taken on line 2 in Fig. 1 and Fi e-3 and 4 are views like that presented in-g. 1 but showing ditl'erent modifications of the structure.

Referring more particularly to Fig. 1: a

eoal-burni furnace of or lined with suit-able* refraotory rick, as the magnesite variety tlereof, s represcnted at 5 as extending from below the ground level to a height of about twenty-ive feet, more or less, above the same, and containing a fue] chamber 6,' the desred diameter of which is about twoieet, for burning, as the preferred fuel, soft cool, on a grate 7 above :n air-blast inlet 8 below whidi is indicated a rotary conveyer 9 for removing the ashes. A ehamber 10 of relativel large proportions, and also forned or line( with such brick, is erected on a substantial foundation adjacent to the furnace 5 and is provided with a sloping roof 1 1, from the a x of which the ore-stuck or kiln 12, likewse formed of or lined with such brick, extends to a heightor distance of, say, 100 feet, ore or less. In oppositewalls. of the chamber are forned ram-openipgs 13 to the desired number, each opening alining with -of the hot gases from the one in^the opposite chanber wall to permit rams, indicated at 14, to beprovided on one Wall and adapted to be reciprocated by hydraulic or other` suitable power, for working them through the openings, for the purpose hereinafter explained. Below the openings 13 and just above the chamber botton which should slightly incline downwardly to'- ward its longitudinal center, as represented, is provided a tap-hole 15. A flue-neck 16 connects the furnace chamher 6, froni between its endsand preferably froni about midway between them, with the adjacent side of the chamber. This neck is, by prof erence but not necessarily, com osed of solid carbonaceous material, as grep te i'n block form, or a mixture of pulverized graphitic carbon, in the pro ortion of about 10 per cent. and pulverizec coke in the proportion of aboutQO per cent., with a suflicient quantity of binding material, such as coal-tr, the nixture being conpacted to solid form byVydraulic or other pressure and then hardened i by baking. This n at'erial renders the flue i proof against destrhton under the heat to which it is subjected froni the burning gases The construction illustrated ii Fig. 3 difi'ers fron'that resented-in Fig. only in placing the base o the ohamber 10 below that of the furnace 5 and running the flue into it at its junction' with' the lower end of the stack and the construction shown in Fig. 4 diti'ers from that presented in Fig.- 1 in extendng the stack immediately over the inner end of the flue 16 and forming a chan'ber with its inner wall flush with the correspoding side of the stack and thus with the roof 11 sloping only toward the outer wall containing the openings 13 which are equipped with the ranjdevices 14 and eline with the similar openings 13 in the opposite wall, which lead to an area 18 between the chamber 10 and the furnace 5.-

To operate this s'nelting furnace, the procedure is as follows: The stack or kiln 12 is charged with the ore to be partially melted, in 'a finely pulve'ized condition mixed' with which pass through ,it to the exclusion of air. A

suitablerefractory material, preferably coke,

in lurnp form to render the column of material which is supplied to the stack through its upper end inte'stitial throughout and-nonpacking to facilitate the assage through'it urn ng fuel in the furnace 5, which reach the ore-column through the fine 16 and ese at the top ot the stack. The lower end o the column of material to be acted on will spread out into the downwardly-fiarng shape indicated by the dotted lines at 19 in Figs. l and 3, forming about itthe space 20, or intothe downwardly-flaring shape indicated by dotted lines at 19 in Fi 4 fo .the space 21 atthe outer side o *the base i the ore-column. The reducing gases from the fu ace 5 pass through the flue 16 directly into the space 20, near the base thereof in the construction according to Fig. 1, passing around and through the expanded base of the ore-column and rsing therein and .passing-through the ore in the stack or kiln to reduco the metallic oxids to 'netal. My intention is in practice, to cause the temperature in the lower part of the chamber 10 to be suflicently h' h to melt a large proportion of the slag-ma dig stituents of theme. In the construction accordinlg to Figs. 3 and 4 the hot gases enter from t e fine mmediatery into the lower end of the 'stack to rise -through the interstitial column of ore therein, Bart of the gases descending into the space 0 or the space 21, as the case ma be, and thence permeating and attacking t e expanded base of the orec umn. The space adjacent to the .oreco umn base in-t e chamber 10 rendere it a combustion-enhancing chamber for the gases to augment the intensity of their heat and the intensity of their action onthe ore which should be suflicient to melt at'least a large pro rtion of "the slag-ma 'constituents -of t e ore, but not the f metal. The :molten slag may be accumulated as a bath and may reach 'a d th indicated` by the dotted line 22 in the c ambe'r 10, whence it may be tapped ofl from time to time, through' the opening 15. As slag-makmg' constituents aremelted onto! the mass in the expanded base of the column, the unmelted part of the ore mah-es to be removed, to be replaced by grvit with ore from the stack. To efl'ect' ths t e 'ram-devices 14 are actuated from time to' time to 'reci rocate through the column base and force t e unmelted material ahead of them through the discharge-open-' ings 13. The metal may'then be separated, as by crushing afid screening the material thus discharged, or otherwise.

What I claim as new and desire to secure by Letters Patent is- 1. In an ore-smelting furnace, the combination ofa carbonaceous-fuel-burnng furnace, an ore-stack, a chamber beneath and of greater cross-sectional dinensions than the stack, said chamber having a roof from whichthe stack rises and through whiclf it diecharges into the eha'mber and e fluefrining neck leadn 'from saidfuel-fumace, at a point about mi wa between its upper and lower ends, into sai ch'amber and stack near their junction, for the purpose set forth.

2. In an ore-smelting furnace, the combination of a carbonaceous-fuel-burnig furnace, an ore-stack', a chamber beneath and ofber and stack nea'r their junction, for the purpose set forth.

3. In an ore-amelting furnace, the combination of a carbonaceous-fuel-burning-furnace, an ore-stack, a chamber beneath and of greater cross-seotional dimensione fillin the 4 stack, said cha'mber having a roof from which the stack and through? which it discharges into the chamber, and a flue-forming neck of solid carbonabeops material' leading from said fuel-fumace, at a point about midway between itsupper and lower ende,

into sad chamber and stack near their junci tion, for the purpose set fol-th.

4. In an ore smelting furnace, the combination of a carbonaceous-fuel-buming furnace, an ore-stack, a chanber beneath and of v greater cross-sectional dimensione than the a stack, said chamber having a roof from which the stackrises and through which it discharges into the chamber, openings in opposte walls of said chamber and" ram-devices working in said o enings, and afiue-connec tion between, the el-furnace and said chamber and' stack near their junction, for tihe pf'pose set forth. i

5. In anKre-smelting fumace, the combination of carbonaceous-fuel-burning furnace, an ore-stack, a chanber be'eath and of greater cross-seetional dimensione than the stack, said chamber having a roof from which 'the stack rises and through which it dis charges into`the chamber, openings in op posite walls of said chamber 'and ram-devices workin in said openings, and a flue-forming neck o solid carbonaceous material connecting said fuel-fumace from a point About midway between its 'ends with said cha/'mbet near its junction with the stack, for the purpose set forth.

;JOHN T. JONES. In presence of C. T. WINEGA, Ce G. JoNEs.

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