US930254A - Ore-roasting furnace. - Google Patents

Description

A. R. WILPLEY.

ORE ROASTING FURNACE.

APPLIOATION FILED NOV. 7, 1906.

930,254. Patented Aug. 3, 1909.

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A. R. WILFLEY.

ORE ROASTING FURNACE.

APPLIOATIOK FILED NOV. 7, 1906.

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A. R. WILFLEY.

ORE ROASTING FURNACE.

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clear, and exact PATENT OFFICE.

ARTHUR R. W ILFLEY,

OF DENVER, COLORADO, ASSIGNOR OF ONE-HALF TO JOSEPH SEEP, OF TITUSVILLE, PENNSYLVANIA.

ORE-ROASTING FURNACE Specification of Letters Patent.

Patented Aug. 3, 1989.

Application filed November 7, 1906. Serial No. 342,429.

To all whomit 'I'It(1 i/ concern:

Be it known that I, ARTHUR R. W ILFLEY, a citizen of the United States, residing in the city and county of Denver and State of Colorado, have invented certain new and useful Im rovements in Ore-Roasting Furnaces; and I do declare the following-to be a full, 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 ore roasting furnaces, my object being to provide a construction of this class more espe mit them to cling together.

cially adapted for producing amagnetic roast.

The object of my present. construction is the same as that set forth in my previous applications filed Oct. 13th, 1 906, and numbered 388,725 and 338,726, respectively.

In obtaining a roast to be followed by magnetic separation, it is absolutely essential to prevent the ore particles from clinging together by reason of too much heat resulting in semi or partial fusion. In order to prevent this difiiculty, I cause the ore to drop downwardly through a flue or chamber. 'At the bottom of this flue I arrange a water jacket or other cooling medium which the ore engages as it falls thus suddenly cooling it before its particles are allowed to come in contact under such circumstances as to per- This feature is embodied broadly in my said applications.

As the ore starts downwardly 1n the flue or chamber it issubjected to the action of the heat from the fire boxes below, and as the impurities as sulfur are ignited, the tendency of the ore is to rise in temperature as it moves downwardly, and there is some danger that before reaching the bottom of the flue or chamber it may become heated to such a degree that there will be a strong tendency for the particles to cling together as they come in contact.

' nace. As this air travels upwardly through the pipes within the ore flue or chamber, its temperature rises and by the time it reaches the top of the flue and escapes from the air pipes or conduits, it is exceedingly hot and comes in contact with the falling ore. By reason of this construction and arrangement,

the action or influence of the air within the pipes which gradually becomes colder as the oreapproaches the lower extremity of its flue or chamber. In this way the ore is partially cooled as it passes downwardly in the flue and the tendency to become overheated is neutralized. At the same time by the introduction of the air through the ipes, into the ore in the upper part of the tie, it becomes practicable to roast a heavy sulfid ore, without additional fuel after the original firing of the furnace or the commencement of the roasting operation.

Having briefly explained my improved construction as ,well as the function it is intended to perform, I will proceed to describe the same in detail reference being made to the accompanying drawing in which is illustrated an vembodiment thereof.

In this 'drawing, Figure I is a vertical section taken through the furnace on the line 11 Fig. 2. Fig. 2' is a central vertical section taken on the line 2 -2 Fig. 1'. Fig. 2' is a horizontal section taken on the line 33 Fig. 2. y

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

Let the numeral 5 designate each of two fire boxes, from which flues 6 lead upwardly and communicate at the top with an ore fine or upright chamber 7 arranged to receive ore through a passage 8 formed in the top wall of the chamber and communicating with the hopper 9. In the lower part of the chamber 7 and occupying positions on opposite sides thereof, are cold air conduits 10 whose opposite extremities'are controlled by dam ers 12 to which are attached rods 13 accessib e from the outside of the furnace. The extremities of theconduits 10, communicate with the ash pits of the fire boxes 5 and these conduits receive their air through the o enings 14 of the ash pits, the doors 15 being eft open for the purpose. Connected with each cold air conduit 10 is aseries of open ended air pipes 16, the two series of pipes extending upwardly on the opposite sides of the upright ore the ore as it moves downward is subjected to chamber and terminate in the upper portion j thereof where the ore enters the said chamber through the passage 18. These pipes being I arranged on opposite sides of the ore cham- I ber, and the ore being fed into'the central portion thereof, there is no tendency of the ore to enter the air pipes.

Below the cold air conduits 10 and oceu ing a position directly in the path of the falling ore, is a jacket 17 through which a coolin fluid as water is continually circulated. At the lower extremity of this inclined jacket, is located a screw conveyer 18 for removing the roasted ore from the furnace. On the opposite side of the screw conveyer is located another inclined jacket designated 19, arranged to further cool any ore that may be thrown to the opposite side of the chamber from the jacket 17, as the ore strikes the last named jacket. The screw conveyer is also surrounded by a water jacket designated 20. The chamber containing the water jackets 17 and 19 is designated 21 in the drawing. This chamber at its extremity opposite the water jacket 17, communicates by way of an opening 23 With a stack or chimney 22.

From the foregoing description the use and operation of my improved construction will be readily understood. Assuming that fires are lighted in the fire boxes 5, the heat and products of combustion are carried upwardly through the ilues 6 at the o posite ends of the upright ore chamber 7, an delivered into the top of the last named chamber, ad acent thev en extremities of the air pipes 16. It must l so be assumed that the ore is entering the top of the upright chamber through the passa e 8. Hence the heat from the fire boxes bel ow, together with the air in the pipe 16, min les with the falling ore, resulting in the com ustion of the impurities as sulfur contained therein. After the initial firing, the

impurities of the ore especially if it be of a will be suflicient to heavy sulfid character,

supply the fuel for roasting purposes and the fire within the fire boxes 5 may be allowed to go out.

As the impurities of the air are first attacked by the heat in the upper extremity of of the ore is continually rising. However, the

tendency of overheating resulting from this cause, is neutralized by the cold air upwardly through the pipes 6 from t e cold air ducts 10, thus preventing the overheating of the ore'and overcoming any clinging tendency which otherwise might result. Then as the ore falls u on the water jacket 17 it is further cooled within the furnace to such an extent as to revent the ore particles from clinging toget conveyer and are remove from the furnace. This cooled condition of the ore also prevents any further roasting-outside of the furnace as the air comes in contact with the oxygen of the atmosphere or outer air.

Having thus described my invention, what claim is:

In an ore roasting furnace, the combination of an. upright flue or chamber constructed to permit the ore to be fed into the top thereof, a horizontally disposed conduit communicating directly with the outer air, pipes connected at the bottom with said conduit, and passing u wardly their entire length through said ue or chamber, said pipes being open at the top to allow the air from the conduit to come in contact with'the er as they pass into the screw falling ore, and means for introducing heat to the ore at the top of the chamber.

In testimony whereof I presence of two witnesses.

ARTHUR R. WILFLEY. Witnesses:

- DENA NELSON,

A. J. 'OBRIEN.

afiix my signature

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