US939936A - Roasting-furnace. - Google Patents

Description

A. R. WILFLEY.

ROASTING FURNAGE.

APPLICATION FILED FEB.19,1907.

separation.

These Water jackets reduce the heat of the 'UNITED sTATnsrArENT OFFICE. Y

ARTHUR R. WILFLEY, OF DENVER, COLORADO, ASSIGNOR OF SEEP, OF OIL CITY,

PENNSYLVANIA.

ROASTING-FURNACE.

Specification of Letters Patent.

Patented Nov. 9, 1909.

Application tiled February 19, 1907. Serial No. 358,169.

To all whom it may concer/n,.-

Be it known that I, ARTHUR It. IVILFLEY, a citizen of the United States, residing at the city and count-y of Denver and State of Colorado, have invented certain new and useful Improvements in Roasting-Furnaces;A and I do declare the following to be a full, clear. and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the figures of reference marked thereon, which form a part of this specification.

My invention relates to improvements in roasting furnaces more especially adapted for producing a. magnetic roast or a roast whereby the ore is prepared for magnetic In order to obtain satisfactory results in the magnetic separation of ores, it is exceedingly important to prevent the overroasting of the ores, or the overheating thereof due to the combust-ible elements contained in the ores which results in partial fusion, causing the ore particles to cling together thus retarding their separation. In my previous application No. 338,725, filed Oct. 15th, 1906, allowed Dec. 13th, 1906, provision is made for subjecting the ore particles while falling to sufficient heat for roasting purposes and cooling the said particles while in the disseminated state, sufficiently to overcome the clinging tendency. In my present application I propose to provide mechanism, to prevent the overheating of the ores While traveling en. masse through the roasting chamber or in suitable proximity thereto while traveling on the hearth or other support. In the drawing one form of construction suitable for carrying out this principle is illustrated, namely a shaking hearth provided with water jackets at sultable intervals, over which the ore travels while subjected to the roasting temperature.

ore and are so arranged as to prevent overheating and consequent clinging which latter condition as heretofore indicated, interferes with magnetic separation. It must be understood,'however, that the invention is` not limited to the special construction shown j as I am aware that other forms may be emi the 1nvention.

V Having briefly outlined my improvedconstruction I will proceed to describe the same in detail referen being made to the accompanying drawing in which is illustrated an embodiment thereof.

In this drawing, Figure 1 is a vertical longitudinal section taken through a roasting furnace equipped with my improvements. Fig. 2 is a cross section taken on the line 2 2, Fig. 1. Fig. .3 is a horizontal section taken through the walls of the furnace lookingdownwardly upon the hearth which is shown in plan view.

The same reference characters indicate the same parts in all the views.

Let'` the numeral 5 designate a furnace having a ire box 6; an ash pit 7; a bridge wall 8; a roasting chamber 9; and a stack 10. lVithin the roasting chamber is mounted a hearth 11 occupying a position downwardly inclined from its head or right hand extremity toward the foot or tail thereof, the inclination being sufficient to cause the ore to travel downwardly on the hearth, under the influence of the vibratory movement or shaking action imparted bv a shaft 12 provided with eccentrics 13 Working in straps l1 which are connected with the head or upper extremity of the hearth by a pitman 15.

As shown in the drawing there are two pitmen, respectively connected with the eccentric straps engaging disks 13 on the said shaft. The pitmen are connected with the head of the hearth by attaching them to a transverse rod 16, Whlch rod passes through head extensions 17- of the hearth. This hearth as sh'own in the drawing is composed of a number of water jackets 18 disposed at suitable intervals, and alternating with solid sections or parts 19. The relative areas of the water jackets to the plain or solid portions of the hearth, may be regulated at will. It is desirable, however, to subject the ore to the cooling action of the jackets as it is traveling through the roasting chamber, whereby the ore may be tempered to prevent overheating and the partial fusion incidental thereto resulting in giving the vore particles a clinging tendency.

As shown in the drawing the hearth is supported upon rollers 20 arranged under- ONE-HALF To JOSEPH p ...ses

5 neath the hearth and whose extremities are Y temperature at the proper limit regardless of the temperature of the roasting chamber.

journaled in theopposite sides of the furnace walls. I *lach-,water` jacket is provided with an in'let pipey 21 at one extremity and an outlet pipe 22 at the other extremity.

Referring to Fig. 1 the pipes disclosed therein may. be considered the outlet pipes 22 which communicate with a conduit 23 for carryin olf the water. `This conduit is provided with a valve 24, for regulating the j circulation of the water through the jackets.

longitudinal direction, or alongitudinal vibration will be imparted' to lthe hearth, of sufficient lrapidity to cause the ore to travel downwardly over the hearth Vas it vpasses through theroasting chamber. Asthe orer travels from the head l of the hearth, toward the bridge wall ofthe frebox, the natural tendency would be, for the temperature of the ore to increase; and it would be very difficult to revent overheating. the ore,

Vwithout the mterposition of a cooling medium, particularly in the case of heavy suliid ores, in, which the percentage of sulfur` is sogreat that after combustion is started,

the ore supplies its own fuel and in consuming this `fuel the temperature of the ore would be far too great for magnetic roasting, since partial fusion would result causing the ore particles while traveling through the roasting chambeijen messe, to cling together whereby magnetic separation is retarded or prevented. However, by virtue of myl improvements, no accuracy is required in the regulation of the heat, since the water jackets serve to maintain the As shown in the drawing the ore as' it leaves the lower extremity of the hearth,y

falls into a trough or casing 28 carrying a screw conveyer 27, whereby the ore after it leaves the hearth may be transferred to any desired location.

In order to maintain the ore upon the hearth as it travels downwardly thereover, it should be provided with longitudinally disposed, upwardly projecting strips or flanges, to prevent the materiall from traveling over the side edges of the hearth during its downward movement.

Having thus described my invention, what 'I claim is: j v Y j l1., `=A roasting -furnacecomprising a roasting chamber, and means for causing the ore' to travel therethroughen masse, and means equipped with a flexible inlet and outlet located at different intervals for cooling the ore while so traveling through the said chamber to prevent over-heating.

2. In an ore roasting apparatus, the com- 'zov bination with a roasting chamber, of means A located therein for causin the ore to travel en masse in the said c amber, the said means being provided with a number of independent cooling media, each rovided with a. separate inlet and outlet pipe, over which the-ore must passwith which it is brought in contact during theroasting operation. i 1 1 3. In a roastin furnace, the combination ,with a roastingc amber, of means movably mounted for causing the ore to travel en masse therein, andv a number of cooling jackets located at suitable intervalsin the said chamber and each'y supplied with a separate inlet and outlet means and the said jackets placed in suitable proximity to the traveling ore to prevent over-heating, substantially as described. i

4. The combination with a-roasting chamber, of a hearth. movably mounted therein and carrying cooling media located at different intervals and each provided with a separate inlet and outlet pipe and means for imparting a shaking movement to the hearth to cause the material to'travel thereover.

5. A roasting furnace comprising a roasting chamber through which the ore is adapted to travel, and a number ofindependent members, each having a `separate inlet and outlet means, for subjecting the ore while traveling through the furnace to a cooling influence durin .the entire period of the roasting operatlon to prevent over-heating and the consequent clinging of the ore particles. i v

6. A roasting furnace comprising a roasting chamber through which the ore is adapted to travel, and a number of independent water jackets each having a separate inlet and outlet pipe, located within the furnace for cooling the ore simultaneously with the performance of the roasting function, to prevent the over-heating of the ore particles and their consequent cllnging, substantially as described. A

In testimony whereof I affix my signature in presence of two witnesses.l

- ARTHUR R. WILFLEY.

Witnesses: l

UDENA NELSON,

A. J. OBRIEN.

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