USRE4132E - Improvement in furnaces for roasting ores - Google Patents

Description

EDWARD nnen-son,

OF N EW YORK, N. ASSIGNOR TO HU'DSO ORE-REFINING COMPANY. y v

Letters Patent No. 78,456, dated June 2 1868; reissue No. 4,132, dated September 27, 1870.

IMPROVEMENT IN FURNACES FOR ROASTING QRES.

The Schedule referred to in these Letters Patent and making part of the same To all whom t't-may concern Be it known that I, EDWARD P. HUDSON, of New York, 1n the county and Staterof New York, have iuvented an Improved Furnace and Resulting Process for Roasting and Desulphurizing Orcs; and I do hereby declare that the following is a full and exact description thereof', reference being had to the accom. panyiug drawing making part of this specification- Figure 1 being a central verticalsection of the furnace through the fire-chambers;

Figurev 2, a horizontal section thereof, in. a plane in dicated by the line a: x, fig. 1; and

Figure 3, a vertical section, corresponding with iig.4

1, of a modified form of 'the furnace.

. Like lette vdesignate corresponding partsin allef. theiigu'res'.

The object of niy'inventionis to thoroughly remove sulphur, phosphorus, arsenic, and other noxious substances, from ores, with economy, so that ores containing such ingredients, Yafter treatment by my improved process, may be successfuily reduced to their metallic bases in a pure state. l

Threeimportan't results are attained by the con struction of this furnace: Afirst, a high degree of heat is secured with economy in fuel; second, an excess of` oxygen, the desulphurizing agent, is presented to all parts of the mass of orewithout detlacting from the the temperature; third, the ore, when sutiieiently treated, 'is readily removed from the furnaeewithont obstructing the continuous operations in the treatment of succeeding charges of ores. Let A represent the interior or ore-treating chamher; B 0, the fire-chambers; and D, the hearth of the furnace. The width of the chamber A between the dre-chambers should-,not be so great as not to allow a complete circulation of theheated air into the center of the mass ofthe ore.

First, the, fire-chamber B, on one side, is located just abovevth'e npperedge of the inclined hearth D, opposite to the side where the treated ore. is drawn` out atthe door g, and the ire-ehamber C, onthe opposite side, is located at a higher level than the chainber B, so as to give sulcient room below' for taking out the ores, and in order to more easily and effectuv ally distribute thexheat and air of the blast to the ore. The arrangement is substantially represented in iig. 1. Second, the hearth D is inclined from vbelow the lowerre-ehamber B downward to the door g, where the ore is drawn out 'after treatment. This inclination of the hearth from one side to 'the lother enables the treated ore,l as it settles to the bottom, to be removed equally fromthegmiddle 'and both sides. It also furnishes a chamber er reservoir,` a, at the bottom ol' the main ore-chamber. A, into which the ore, 'as 'it becomes completely desulphurized .or treated, ettles below the furnaces, wherein it can partially f Acool before heilig removed. Instead of .the singly-inclined hearth and fire-chambers at diiierent heights, as shown in iig. an arrangement indicated in fig. 3

'ways to tivo doors, g g, (or more inclinations if ,more

if more than two are used,) the fire-chambers BO are at-the same height, at least entirely above the. high est part'of the hearth, so that a chamber or chambers is furnishedbelow 'the fire-chambers, as in the firstdescribed arrangement.

Third, air isintrodueedinto the ore-chamber through the hearth D, or near the same, at the side or sides of the furnace, or atleast belo'wthe fire-chambers, by .a pipe .or pipes, h, or equivalent means, so thatV it, is heated by the cooling ore on the hearth, whereby, inY turn, the ore is assisted in cooling. .lhus, also, the -air is. introduced into the ore undergoing treatment lwithout first passing throughthefuel, which would deprive the air of its oxygen, and thus prevent its becoming a desulphurizing agent, and thereby acting in .the most efiicientmanner for desulphurizing the ore at the moment of being itself decomposed.

Fourth, besides the introduction of air as a desulphurizing agent through the desulphnrized ore in the cooling-chamber orv reservoir, atmospheric airis introduced'into'the ore through the lire-chambers B O, each of which has one or more pipes br passages, d, extendingfrom the air-'chamber b, below the fire-grate, into the space c above the fuel, or directly from the blast-pipe to the said upper space orchamber c, through which the air is conducted in excess above the -fire without being decomposed in the fuel, and is then forced or passed in a heated state into the mass of ore by the pressure from the blast-pipe f, which leads into the air-cham ber below the fire, `or without such pressure.

as to regulate the amount of free air thus admitted pipe or passage h (one or more) is, or may be, also, provided with a valve to regulate or cnt olf the ow. of air into the furnace' through or near the hearth. Thus free air maybe introduced into the ore either at or through the bottom of the furnace, or above the' through the file-chamber or chambers; or both may be cut olf, as when first heating a charge of ore for treatment; or the amount and relative proportions of air at thedilferent inlets maybe regulated at pleasure. This regulated variation of the introduction of air is desirable, Aif not necessary, to the proper treatmcntwof ent stages of the process of desnlp'hurization.

What-'I claim as my invention, and desire to secure by Letters Patent,

" 1 An ore-roasting furnacev constructed so as to intro may be adopted. -Here the .hearth D inclines b oth doors are,used,) for removing the ore.l and both (or all, v

f The pipe or passage i is controlled by a valve, so

into the furnace, or cnt it oli' entirely; and the airfire-chamber or chambers, or both, at th'e bottom and.

different kinds or qualities of ores, as welljas in di'erduce air in excess of that required for the 'combustion 'of the fuel, but regulated Sin lquantity,-into the ore,-

through the fire-chamber or chambers, over the fire or'fre's, so as 4to be heated therebybefore passing through the ore, substantially as llereilrspecified.

'2. Introducing air iti-excess of' thatrequired for combustion, but regulatedn quantity, into the ores,

through the' fire-chamber or chambers, over` the reI or fires, so as foibe .heated thereby before passing through theores, .substantially as herein specified..

3. In*.oreroasting-furnaces, onere-chambel; ar-

ranged hgher'thah the other, or another, substantial] y as andfor the purpose herein specified.

4. Anore-roastihg furuaoefoonstructed to admit .air through or at thel bottom of the roasting-chamber,

sopas to hasten the cooling of the ore already roasted, and to be itself heated thereby, for the purpose herein set for-th. v

E. I. HUDSON.

vvWitnesses: l

EDWARD YABDLY,

. C. E. HUDSON.

Specification signed by me this 18th day of July,'

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