US1269974A - Smelting-furnace. - Google Patents

Description

' ATTORNEYS SMELTING FURNACE.

T. A; M. STEVENSON.

APPLICATION FILE D MAR.29,19H.

T. A.' M. STEVENSON.

SMELTING FURNACE.

APPLICATION FILED MAR. 29. 19H.

, Patented June 18, 1918. 2 SHEETS-SHEET 2.

WITNESSES ATTORNEYS 'mouas ARTHUR szrevnnson, "or WINSTON-SALEM, non'rn oA-nommi.

' SHZEIJ'TING-FURN-ACE.

Specification of Letters Patent.

Patented JuneilfS, #1918.

Application filed larch 29. 1917. Serial No. 158,230.

To all whom-it may concern Be a known that l, T OMAS A. M. s'TE- VENSQN, a citizen of the United States, and a resident of Winston-Salem, in the county of Forsy-th and State of North Carolina, have invented a new and Im rovedSmelting-Furnace, of which the I oll'ow-ing isa full, clear, and exact .description.

My invention .has for its objectto ,provide a smelting furnace which is relatively cheap to construct, and which may 'bleconveniently shipped, and be operated economically ,in small units. j

The furnace is constructed with a shaft having an. air space which extends etherearound and which serves to carry off the heat, thereby keeping (the. shaft ,at a normal temperature. The .air which is. heated around the shaft is led over the dischar ed slag, after which the heated air is passe .to twyers. Also, by this means thez head ,units are saved which are wasted in the water in old type furnaces and (the space {is heated toa high temperature whichmaybeusedin j greater volume without. chillingthe furnace. A great saving in .fuel is thereby effected.

Additional objects of the ,invgntion will appear in the follow .zspeci cation in I mg "beheated to a hlg'her temperature by comwhich the preferred form of the invention is disclosed. v 1

In the drawings similar reference chauacters denote similar parts in all the views, in which- Figure 1 is a sectional elevation of the in vention; and

Fig. 2 is a sectional view on the line 2-2 of Fig. 1.

By referrin to the drawings, it will be seen that the furnace is constructed with a compartment 5 having an opening 6, a shaft extending upwardly from the top of the compartment and being provided with an inner wall 7 and an outer wall 8 spaced therefrom, forming an air space 9. The inner wall 7 is secured to the top of the compartment 5 around the opening 6. A cold air conduit 10 is mounted on the top of the compartment 5, and is disposed around the bottom of the shaft, there being an opening 11 at the bottom of the outer wall 8 of the shaft, so that the air from the cold air conduit 1O ma pass upwardly in the air s ace 9. Air is fed to this cold air conduit an opening shown by the dotted lines 12, if de ired, y m an o a blower set shown,

It will be understood that as cold air passes "at all times upwardly a ainst the inner wall 7 of the shaft, .it will e impossible for the inner wall ,7 0f the'shaft .to [become unduly heated, and that the air which passes to a hot air conduit 13from the top of the airspace 9, will befheated by contact with the inner wall 7 of the shaft. By means 'of this construction, the shaft be made of relatively light material, thereby'making it possible to ship the furnace QQnvenien'tly in small units which may be used at the mines, "thereby permitting the reduction of ores at themines. 'The inner ,wal'li? ofthe shaft is corrugated vertically, which increases the strength of the shaft and increases thearea of the cooling surface.

In addition to theopening 6 in the compartment-55 thereis another opening 14, the of. air. condu'it,13 having -a terminal 15 which ,extends vdown through "this opening '14 over a ,foreheart'h ear 16 which is -,,pro- .vided 'for'receivin'g slag from the crucible car '17, this cruciblescar 17 bein provided with an outlet .18 leading to the" orehearth car 16. The air which passes {through the hot air conduit to the fore-hearth car will ,heanth car 16 when the furnace is in operation, this air which has been heated by contact with the slag passing to twyers 19, which direct it to the bottom of the shaft. The fore-hearth car 16 is provided with an outlet 20 leading to a spout 21 which is mounted at the opening in the compartment 5. The metal is discharged from the crucible car 17 at an outlet'22 which communicates with an outlet 23 in the compartment 5.

The outlets 20 and 22 are milled to fit against the outer walls of the compartment 5, and the track on which the cars 16 and 17 are disposed is preferably built at a slight angle to the compartment 5 to tighten the joint between the outlets 20 and 22 and the walls of the compartment.

When the smelting furnace is in use the spout 21 is sealed by the slag flowing from the fore-hearth car 16 and the spout 28 is sealed by the matte flowing from the crucible car 17. The air entering the opening 12, passes up in the air space 9, the walls 7 and 8 serving to keep the wall reasonably cool, the air becoming heated and flowing throug he air conduit 13 to the te p ment 5, where it is further heated by the slag in the fore-hearth car 16. The matte settles at the bottom of the crucible car 17 and the slag passes over the outlet 18 to the fore-hearth car 16.

Having thus described my invention, I claim as new, and desire to secure by Letters Patent:

1. In a smelting furnace, a compartment having an opening, a shaft having double walls forming an air space, the inner wall being connected with the compartment at the opening, there being an opening in the outer wall of the shaft adjacent the compartment serving as a cold air inlet leading to the air space, a crucible car in the compartment, means for directing slag from the crucible car, and an air duct leading from the air space at the top of the shaft to the interior of the compartment.

2. In a smelting furnace, a compartment having a shaft opening and opposite sides with an outlet opening in each of its said sides, a shaft connected with the compartment at the shaft opening, tracks in the compartment adjacent one of the said sides and disposed at an angle relatively thereto, a cruciole car on the tracks, tracks in the compartment adjacent other of the said sides and disposed at an angle thereto, a fore-hearth car in the compartment on the last mentioned tracks, means for directing slag from the upper portion of the crucible car to the fore-hearth car, a spout at the bottom of the crucible car fitting one of the outlet openings in the compartment, a spout at the bottom of the fore-hearth car fitting Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents;

the other outlet opening in the compartment, and an air duct leading from the shaft to the interior of the compartment.

8. In a smelting furnace, a compartment having a shaft opening and two outlet openings at its sides, a shaft connected with the compartment at the shaft opening, a crucible car in the compartment under the shaft, a fore-hearth car in the compartment at the side of the crucible car, means for directing slag from the upper portion of the crucible car to the fore-hearth car,

a spout at the bottom of the crucible car fitting one of the outlet openings in the being an opening in the outer wall of the shaft. affording communication between the.

cold air duct and the air space, a crucible car in the compartment under the shaft, a"

fore-hearth car in the compartment at the side of the crucible car, an air duct leading from the air space at the top of the shaft to the interior of the compartment adjacent the fore-hearth car, and means for directing slag from the crucible car to the for -hearth car.

THOMAS ARTHUR M. STEVENSON.

Washington, D. 0.

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