US914622A - Method of reducing ores. - Google Patents

Description

N. WIKSTRM.

METHOD 0F RBDUCING GRES.

APPLIOATION FILED JAN. 1s. 1908.-

914,622 n Patented Mar. 9, 1909.

UNITED srArrLrnN euri NILs WIKSTRM, or Hoeness, RUSSIA;

METHO F REDUGING- GRES.

Specification. of Letters Patent.

Patented March 9, 1909.

Application filed Januarygl, 1908. Serial No. 411,130.

To all whom 'it may concern.'

Beit known that I, Nrrs WIKSTRM, of Hgfors,`Finland, Russia, a subject of the King of Sweden, have invented certain new and useful vImprovements in' Methdds of Reducing Orcs; and I do hereby declare the following to be a full, clear, and eXact de scription ef the invention, such as will enable others skilled in the art to which it appertains tornake and l,use the same, reference'being had to the .accompanying drawings, and Jto letters or figures of reference marked thereon,

which form apart of this specification. s

A furnace 'for effecting the present method of producing iron is illustrated on the annexed drawing where- A Figure 1 showsa vertical andfFig. 2 a hori- Zontal section. Figs. 3 and 4 illustrate mddi feations of a detail. 'v

` likewise iron-ore and lime or other suitable admixtures are ground to the required fineness, The finely divided ore with suitable admiXture of lime is fed into compartment 1- of the chargingfunnel and the coal-powderinto compartment 2 of the charging funnel. By means of the feeding-wheels 3 and 4 coal and ore are.harged.into the feed-pipe 5 in- The feeding-wheels 3 q ande rotate lndependentof each other so suitable proportions.

.- that the charging of coal and ore may be controlled as desired. When the admixture of ore and coal-powder leaves the lower 'end of tube 5.it is struck by a current of highly heated lair or gas (temperature about 1000"- C.) which comesby way ofr nozzle 7, so that i p the admixture of ore andseoal'is blown in.

through thefburner 8 into the fore-furnace 9.

v In the burner 8, in .which thamixture of ore,

4 0 coal and the necessary admixtures are brought into intimate Contact with the gasor aircurrent, the temperature fand the chemical processes may varyin proportion to the temperature of the said current land the quantity of\fuel` supplied and with due regard tov whether the product is pig-iron or wrought-J iron. ,l In the fore-furnace 9 heat' mayfor in stance be supplied in electrical way, prpvided. the temperamre in the burner 8 is ke' t low.

F The iron collects -onthe'bottom dft e fur nace to about the height indicatedby 10 and runs through the opening 11 into the annular er vV-shaped furnace 12. The communica- I ,i tion between furnacesv 9 and 12 is closed by 5,5- means offbridge 13, so that a: small 'l opening 11 arises, through which both theiron as` Coke or charcoal is `powdered qite 'finelyh heating the smelting-mass.

accordincr to vthe quality of iron ore blown int the Dburner 8, withpart 9,v coal-powder or iinelydividediron-oxld may'yif desirable,

lbe fed 1n through another feeding device 14 before opening 11, so that the gasescoming through fore-furnace 9 spread the ironor coal-powder in furnace 12'.

A surplus of ore may also be introduced inlto furnace 9, so

that a part of this ore passes along into the furnace 12, which is made so large that the speed of the gas is decreased to sucha degree, that the powdered ore gets the opportunity of falling to thebottom 1n order to melt with the iron-mass fiowing thereon. .Theexhaust gases from the furnace 12 areled by means ott tubes l5 through the air-heating furnace 1'6"I in order to burn there and heat the blast, which is by means of a suitable ventilator pressed through the heating-pipes 17 passingY through furnace 16 so'fthat the )last is highly heated on e terin nozzle 7. The air may,

of course, a s o be Vieated by any othe'rfordinary heating-,device for blasting-furnaces or glass-works. Thosecombustionfgases which are not vnecessary'for the heating are drawn off4 through sideoutletsv 18 and used for other urposes. 1s jfu'rther heated,` if necessary, by means of electricity in such a manner,l that an induetion coil 19.` with core 20 and cooling-mantle The melted iron in the furnace 12 21 is arranged/in the middle of the furnace,

or else, if the furnace is U-shaped,in the man ner indicated in dotted lines 1n 141g. 2, contacts 22 and 23 are arranged, by which the current is led` directly to the smelfting-mass- The contacts are made hollow, so' that they may bec'ooled by means of vwater-circulation.

The contacts may even in U-'shaped furnacesv also be connected to an induction-circuit' for 'In annular furnaces a bridgev 24 is arranged; which reaches nearly to the upperv edge of thesmelting-mass, so that the gases coming from 9 are compelled to pass in the right direction through the furnace and th ys not enter directly 'into/ the exhaust-pipe 5.

30 duced for reducin the most'easily reducible the ling'the volume, the temperature andthe pressure ofthe air-cp trical heatin l 'f As shown 1n Fig. v3 a tube 30 may eventuall'y' be placed in the prolongation of burner 8, said tube having'alarger diameterthan the burner and" thereby causing .an injectorlike suct'onv at the extrav tube 31, arranged beside the'burner 8,'whe're thus ore, coal and air or gas may be introduced anew so that dierent com onents may be given theiiame in tubes 8 an 30, that is, make the iiame reducing or oxidizing as desired, and thus promote the continuity of theprocess.

As is diagrammatically s own in Fig. 4, two nozzles may also be used.' 'Thr u h theone nozzle `-0.-- heated carbonio oxi is introrrent as Well as the elecore entering at saidreductibntaking place in the burner'pipe -,c`. Through.` the othernozzle -dhighly heated air or a gas-mixture is thenblown in,- whereby the heat in the burnerpart .-cand fore-furnace 9 is lincreased for reducing `the more diiiicultly reduciblefore as Well as partly for smelting' tle .mass The different`- pro or- 4of'tions of air, other gases and ore and coa at thediflerent 4places must be practically ascertained. i

'As is evident from the foregoing, the prese t method may advantageously be used in power for the electric installation and or tlie crushing ofthe ore andthe coal, but where the rices of coke and coal are high:

'Caims 1. The method of reducing oresf'which comprises mixinggranulated ore, granulated carbonaceous material and `fluxes, feeding saidggranulated mixture in a stream, and in'.

`ecting saidstream b meansof a blast of 55. ighly heatedl air t ough a contracted burner and into a closed chamber.v

' 2.' The method of reducing ores which com; prises mixing fine ore, flux and fuel,-feeding the mixture to 'a blast of air `th'erebyfthoroughlymixing the particles withlthe air and roducing combustion in the mixture so ormed at a burner to reduce the oreY 3. The 'method lof reducing ore which comprises mixing fine ore, iiux and fuel, feedingA the mixture to a blastr of air thereby thor- .Besides the above mentioned and at une` such places where there is an amplit de "of oughly mixing the particles with the air and producing combustion `in the mixture so formed at a burner in a closed chamber to reduce the ore. i v Y 1 4. -The method of reducing ores which comprises mixing the fine ore, flux and fuel, feeding the mixture to 'a\hot blast of air thereby thoroughly mixing the particles with the air, and producing combustion in the vmixture so formed at a burner in .a closed chamber to "reducethe ore.

5. The method of reducing ores, which' comrlrises mixing fine ore, flux and fuel, feed.- ing t e mixture substantially transverselyT to` a ot blast of .air thereby thoroughly mixing the particles with the air, and producing combustion in the mixture .so formed ata 'burner in a closed chamber to reduce the ore. 6. 'lhe'method of-l reducing ores,l which comprises mixing iine ore, flux and fuel,'feed ing 'the mixture to a blast of air thereby thoroughly mixing the particles with the air, roducmg lcombustion in the mixture so formed in a closed chamber to reducev the, Iore, collectin the fused mass partly in said chamber an Ypartly .in a second chamber t communicating 4therewith and supplying finely divided refining compounds to the metal. by ablast of gasesjbetween the two chambers. i

7. The vmethod of, reducing ores, which comprises mixing ne ore, flux and fuel, feeding thev mixture .t`o av blast. of air thereby i thoroughly mixing the particles with the air, reducing combustion in the mixture so lformed in a closed Chambertoreduce the ore, collecting the fusedrnasspartly in said chamber and 'partly in a second chamber communicaungftherewah, Supplying en 1y divided of gases between the two chambers and sup- 'plyin the heat to the metal in said secondchamer. 8..The methodof reducing ores, ,which mg t e mixture substantially',` transversely to 'a hot blast of airtherebyhoroughlyjmixing the particles withthe air, producing combustion'in the mixture soformed at a burner in a' partly in ta second chamber communicating 'presence' of two subscribing Witnesses.

' NlLS WIKSTRM.

Witnesses: l H. G. HEDBoM,

" K. Y. LrNDHoLM.

renin'ggcompounds yto vthe metal' by-a blast 105 com rises mixing iine ore, flux and fuel, fed- 11'0.

closed chamber, to reduce the ore, collecting l1115i the fused mass partlyinsaidchamber an my invention, l have`signed my name in

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