US625336A - Ore-roasting furnace - Google Patents

Ore-roasting furnace Download PDF

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US625336A
US625336A US625336DA US625336A US 625336 A US625336 A US 625336A US 625336D A US625336D A US 625336DA US 625336 A US625336 A US 625336A
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hearth
ore
furnace
point
roasting
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/14—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment
    • F27B9/16—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a circular or arcuate path

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  • NiTnD STATES PATENT OFFICE
  • My invention relates to ore roasting and calcining furnaces designed particularly for use in the treatment of sulfurous and arsenical ores; and thel object in view is to provide means for accomplishing a uniform heating or roast-ing of the ore, a more uniform distribution thereof over the surface of the hearth, and greater facility in depositingthe ore upon the hearth and in discharging the same therefrom when sufficiently roasted.
  • a further object of myinvention is to provide means whereby as the roasting operation proceeds the ore is gradually advanced from the point at which it is deposited upon the hearth to an outlet located at a point which is radially remote from the point of deposit.
  • Figure 1 is a central vertical section of a furnace constructed in accordance with my invention, the same being taken in the plane of the rabble.
  • Fig. 2 is a plan view of the furnace with the domed top omitted.
  • Fig. 3 is a partial side view to show the exterior means, located contiguous to the discharge-chute, for operating the rabble.
  • Fig. i is a detail sectional view of the hearth and contiguous portions of the structure to show the means for sealing the joint for closing the interval between the periphery of the hearth and the wall of the furnace.
  • Fig. 5 is a detail view in perspective of a portion of the rabble.
  • My invention relates to that class of oreroasting furnaces wherein the ore is deposited upon a circular or annular hearth; and that embodiment of my invention which I have deemed best adapted to carry out the Serial No.680,942. (No model.)
  • annular furnace wall l having a domed top or cover 2, provided with an ore-inlet opening 3, with which communicates a feed -hopper 4, said feedopening being located adjacent to the center of the domed top or cover, where a working opening 36 is provided to give access to the interior of the furnace.
  • a circular hearth 6 Ooextensive with the furnace and mounted for revoluble movement therein is a circular hearth 6, which in the construction illustrated is provided with a refractory ore-receiving surface 7, of brick or analogous material, supported by metal plates 8, which are in turn u pheld by frame-bars consisting of' I- rails 9.
  • the illustrated refractory surface of the hearth is of stepped construction, consisting of a series of annular steps or platforms which are arranged in successively-lower planes from the center of the hearth toward its periphery.
  • the object in arranging the steps or platforms successively lower from the center toward the periphery is to allow for a gradual descent of the ore from the point of inlet or deposit to 'the'point of outlet or discharge.
  • the hopper or inlet opening is disposed to discharge ore upon the uppermost or central step or platform of the hearth, while located in the wall of the furnace, and hence beyond the periphery of the hearth, and in and below the plane of the lower-most peripheral step or platform is a discharge-chute 10, extending in a downwardly and outwardly inclined di-A rection through the furnace-wall to convey the properly-roasted contents of the furnace to a point outside of the same.
  • the upper portion of the spindle 15 may be inclosed in a suitable refractory sheath 15, and seated upon the upper end of said ,spindle is a cap 23, an antifriction-bearing 24, consisting of balls or rollers, being interposed between the cap and the extremity of the spindle, and mounted at their inner ends in bearings 25, carried by said cap, are rabblespindles 26, preferably of tubular construction and extending radially of the hearth above the plane thereof and through suitable guides orapertures 27 in the side walls of the furnace.
  • the outer ends of the rabble spindles or shafts are fitted with operating-levers or handles 2S.
  • the rabble-shafts occupy iixed p0- sitions with relation to the furnace and carry a series of rabble or stirring blades 31, disposed at an angle to the radius of the hearth, the blades of the diderent rabble-shafts being inclined in diiferent directions to cause a backward-and-forward or radial inward-andoutward shifting of the ore on the surfaces of the hearth-steps.
  • a packing device consisting of a rim 39, secured to the outer ends of the I-rails 9 and depending from the outer edge of the refractory surface of the hearth, and an annular trough, groove, or analogous receptacle 40, lled with sand, iine ore, or any equi valent granular or movable packing material 41 and receiving the lower edge of said rim.
  • This form of packing does not interfere with the rotary movement of the hearth, and yet is effective in preventing waste of the heat.
  • the advantage of my present form of hearth resides in the fact that the discharge, ⁇ after the furnace has beenworking a sufficient length of time to secure a uniform distribution of ore upon its surface, is continuous, and hence the supply may also be continuous and insure a uniformity in the roasting 0peration, which is desirable in this class of devices.
  • An orc-roasting furnace having arotary stepped hearth, means for depositing material upon, and receiving the same after the roast# ing operation from, the hearth, and a feeding device for advancing the material upon the hearth from the point of deposit to the point of discharge, said means consisting of a series of blades, disposed diagonally with relation to a radial line of the hearth, and in operative relation with the several steps of the hearth-surface, and a radial spindle,- supporting a plurality of said blades, mounted for revoluble movement to provide for swinging the blades toward and from the surface of the hearth, substantially as specified.
  • An ore-roasting furnace having a rotary stepped hearth, means for depositing material upon, and receiving the same after the roasting operation from, the hearth, and a feeding device for advancing the material upon the hearth from the point of deposit to the point of discharge, said device consisting of a series of blades disposed obliquely to a radial line of the hearth and in operative relation with the several steps of the hearth-surface, and a spindle common to and supporting the series of blades, mounted for revoluble movement to withdraw said blades from operative relation with the surface of the hearth, and provided with means, located outside of the furnace-wall, for varying the position of said spindle, substantially as specified.
  • An ore-roasting furnace having a rotary stepped hearth, means for depositing material upon, and receiving the same, after the roast-l ing operation, from, the hearth, and a feeding device, for advancing the material upon the hearth from the point of deposit to the point of discharge, said means including a series of diagonally-disposed blades arranged in operative relation with the several steps of the hearth-surface, and a common blade-supporting spindle mounted in fixed bearings in the furnace,and terminally exposed for manipulation exteriorly thereof, substantially as specied.
  • An ore-roasting furnace having a domed top provided with a central Working hole having a removable stopper, a rotary stepped hearth having' a central spindle arranged in alinement with said working hole and stepped at its lower end in a suitable bearing, said hearth beingelevated at its center andV depressedat its periphery, ore depositing and .the presence of two Witnesses.

Description

No. 625,336. Patented May 23, |899. J. F. KEIPER. 4
ORE BOASTING FUBNACE.
(Application led May 17, 189B.) (No Model.) 2 Sheets-Sheet I.
N MN m. www NV Nm, Hm
no. 625,336. I Patented may 23, |899.
J. F. KEIPER.
URE ROASTING FUBIIACE.
(Application led May 17, 1898.) @No Model.) 2 Sheets-Sheet 2.
m: News paens co. pHoro-mwa., wnsmusmw4 n. c.
NiTnD STATES PATENT OFFICE.
JOHN F. KEIPER, OF EVERETT, WASHINGTON.
ORE-ROASTING FU RNACE.
SPECIFICATION forming part of Letters Patent No. 625,336, dated May 23, 1899.
Application led May 17, 1898.
To @ZZ 'whom t ntrry concern:
Be it known that I, JOHN F. KEIPER, a citizen of the United States, residing at Everett, in the county of Snohomish and State of Washington, have invented a new and useful Ore-Roasting Furnace, of which the following is a specication.
My invention relates to ore roasting and calcining furnaces designed particularly for use in the treatment of sulfurous and arsenical ores; and thel object in view is to provide means for accomplishing a uniform heating or roast-ing of the ore, a more uniform distribution thereof over the surface of the hearth, and greater facility in depositingthe ore upon the hearth and in discharging the same therefrom when sufficiently roasted.
A further object of myinvention is to provide means whereby as the roasting operation proceeds the ore is gradually advanced from the point at which it is deposited upon the hearth to an outlet located at a point which is radially remote from the point of deposit.
Further objects and advantages of this invention will appear in the following description, and the novel features thereof will be particularly pointed out in the appended claims. v
In the drawings, Figure 1 is a central vertical section of a furnace constructed in accordance with my invention, the same being taken in the plane of the rabble. Fig. 2 is a plan view of the furnace with the domed top omitted. Fig. 3 is a partial side view to show the exterior means, located contiguous to the discharge-chute, for operating the rabble. Fig. i is a detail sectional view of the hearth and contiguous portions of the structure to show the means for sealing the joint for closing the interval between the periphery of the hearth and the wall of the furnace. Fig. 5 is a detail view in perspective of a portion of the rabble.
Similar numerals of reference indicate corresponding parts in all the figures of the drawings.
My invention relates to that class of oreroasting furnaces wherein the ore is deposited upon a circular or annular hearth; and that embodiment of my invention which I have deemed best adapted to carry out the Serial No.680,942. (No model.)
objects in View includes an annular furnace wall l, having a domed top or cover 2, provided with an ore-inlet opening 3, with which communicates a feed -hopper 4, said feedopening being located adjacent to the center of the domed top or cover, where a working opening 36 is provided to give access to the interior of the furnace.
Ooextensive with the furnace and mounted for revoluble movement therein isa circular hearth 6, which in the construction illustrated is provided with a refractory ore-receiving surface 7, of brick or analogous material, supported by metal plates 8, which are in turn u pheld by frame-bars consisting of' I- rails 9. The illustrated refractory surface of the hearth is of stepped construction, consisting of a series of annular steps or platforms which are arranged in successively-lower planes from the center of the hearth toward its periphery. It will be understood, however, that the object in arranging the steps or platforms successively lower from the center toward the periphery is to allow for a gradual descent of the ore from the point of inlet or deposit to 'the'point of outlet or discharge. In the furnace which is illustrated the hopper or inlet opening is disposed to discharge ore upon the uppermost or central step or platform of the hearth, while located in the wall of the furnace, and hence beyond the periphery of the hearth, and in and below the plane of the lower-most peripheral step or platform is a discharge-chute 10, extending in a downwardly and outwardly inclined di-A rection through the furnace-wall to convey the properly-roasted contents of the furnace to a point outside of the same.
The hearth, as above indicated, is constructed for rotary movement, and such movement is designed to bring different portions of its surface successively on a line connecting a fire-box or combustion-chamber 13 and the outlet-fine 14, said hre-box and outlet being preferably located at diametrically opposite points and communicating with the interior of the furnace, and the means illustrated in the drawings for supporting the hearth in= cludea central spindle l5, extending above and below the plane of the hearth, with the lower extremity seated in a socket-bearing 16,- supported by a pedestal, base, or foundation ICO 17. Also attached to the under sides of the radial frame-bars 9 of the hearth isa circular track-rail 18, which traverses a plurality of bearing-rollers 19, each suitably mounted upon a base 20.
Various means may be provided for imparting continuous rotary motion to the hearth; but in the drawings I have deemed it suliicient to illustrate a cable 21 or its equivalent (such as a chain) traversin gspaced brackets or sprockets 22, depending from the under side of the hearth and adapted to be actuated by any suitable means.
The upper portion of the spindle 15 may be inclosed in a suitable refractory sheath 15, and seated upon the upper end of said ,spindle is a cap 23, an antifriction-bearing 24, consisting of balls or rollers, being interposed between the cap and the extremity of the spindle, and mounted at their inner ends in bearings 25, carried by said cap, are rabblespindles 26, preferably of tubular construction and extending radially of the hearth above the plane thereof and through suitable guides orapertures 27 in the side walls of the furnace. The outer ends of the rabble spindles or shafts are fitted with operating-levers or handles 2S.
The rabble-shafts, of which any desired number may be employed, occupy iixed p0- sitions with relation to the furnace and carry a series of rabble or stirring blades 31, disposed at an angle to the radius of the hearth, the blades of the diderent rabble-shafts being inclined in diiferent directions to cause a backward-and-forward or radial inward-andoutward shifting of the ore on the surfaces of the hearth-steps. Obviously the ultimate result of this shifting of the ore by the blades is to advance it radially from the point of the deposit thereof to the point of discharge, whereby inasmuch as one of the rabbleshafts is located contiguous to the discharge-chute 10 a practically continuous discharge of the ore through the chute after it has passed through the distance from the hopper to the periphery will result after the operation of the mechanism has continued for a sufficient length of time to cover the entire surface of the hearth. Furthermore, in order to prevent the access of cold air to the space above the hearth I employ a packing device consisting of a rim 39, secured to the outer ends of the I-rails 9 and depending from the outer edge of the refractory surface of the hearth, and an annular trough, groove, or analogous receptacle 40, lled with sand, iine ore, or any equi valent granular or movable packing material 41 and receiving the lower edge of said rim. This form of packing does not interfere with the rotary movement of the hearth, and yet is effective in preventing waste of the heat.
The advantage of my present form of hearth resides in the fact that the discharge,`after the furnace has beenworking a sufficient length of time to secure a uniform distribution of ore upon its surface, is continuous, and hence the supply may also be continuous and insure a uniformity in the roasting 0peration, which is desirable in this class of devices.
Various changes in the form, proportion,
Aand the minor details of construction may be resorted to without departing from the spirit or sacrificing any of the advantages of this invention.
Having described my invention, what I claim is- 1. An orc-roasting furnace having arotary stepped hearth, means for depositing material upon, and receiving the same after the roast# ing operation from, the hearth, and a feeding device for advancing the material upon the hearth from the point of deposit to the point of discharge, said means consisting of a series of blades, disposed diagonally with relation to a radial line of the hearth, and in operative relation with the several steps of the hearth-surface, and a radial spindle,- supporting a plurality of said blades, mounted for revoluble movement to provide for swinging the blades toward and from the surface of the hearth, substantially as specified.
2. An ore-roasting furnace having a rotary stepped hearth, means for depositing material upon, and receiving the same after the roasting operation from, the hearth, and a feeding device for advancing the material upon the hearth from the point of deposit to the point of discharge, said device consisting of a series of blades disposed obliquely to a radial line of the hearth and in operative relation with the several steps of the hearth-surface, and a spindle common to and supporting the series of blades, mounted for revoluble movement to withdraw said blades from operative relation with the surface of the hearth, and provided with means, located outside of the furnace-wall, for varying the position of said spindle, substantially as specified.
3. An ore-roasting furnace having a rotary stepped hearth, means for depositing material upon, and receiving the same, after the roast-l ing operation, from, the hearth, and a feeding device, for advancing the material upon the hearth from the point of deposit to the point of discharge, said means including a series of diagonally-disposed blades arranged in operative relation with the several steps of the hearth-surface, and a common blade-supporting spindle mounted in fixed bearings in the furnace,and terminally exposed for manipulation exteriorly thereof, substantially as specied.
4. An ore-roasting furnace having a rotary IOO IIO
hearth stepped downwardly from its center per exposed extremity of the hearth-spindle, a refractory sheath inclosing.,r the portion of the hearth-spindle below said cap, and bladecarrying spindles mounted near their outer ends in the Walls of the furnace and at their inner ends in bearings in said cap, substantially as specied. A
5. An ore-roasting furnace having a domed top provided with a central Working hole having a removable stopper, a rotary stepped hearth having' a central spindle arranged in alinement with said working hole and stepped at its lower end in a suitable bearing, said hearth beingelevated at its center andV depressedat its periphery, ore depositing and .the presence of two Witnesses.
JOHN F. KEIPER.
Witnesses: Y
LoUIs G. HEYBRQCK, ALBERT A. BRoDEoK.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3612497A (en) * 1969-12-22 1971-10-12 Marathon Oil Co Center feed rotary hearth calciner

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3612497A (en) * 1969-12-22 1971-10-12 Marathon Oil Co Center feed rotary hearth calciner

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