USRE3107E - Improved furnace for roasting ores - Google Patents

Description

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CHARLES MELLINGEH, 0F CORNWALL, PENNSYLVANIA.-

Letters Patent No."i8,113, dated May 19, 1868; reissue Nb. 8,107, dated September 1, 1868.

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TO ALL WHOM IT. MAY CONCERN:

Be it known that I, CHARLES MELLINGER, of Cornwall, in the county of Lebanon, and State of Pennsylvania, have invented a new and useful Improvement in Blast-Furnnces;' and I do hereby declare that the following is a full, clear,'and exact description thereof, which will enable those skilled in the art to make and use the some, reference being had to the aecompnnyingllrawings forming part of this specification, in which- The invention relates to improvements in the mcthodof manufacturing pig-iron, but having more particular reference to preparing or desulphurizing the ore before it is introduced into the blast-furnace.-

And the invention consists in the construction and general arrangement of snoven or furnace, the usual which enables me to utilize the heat and gaseous products of combustion, which escape from the blast-furnace in the operation of smelting, thereby dcsnlphurizing, preparing, or roasting the ore, preparatory-to smelting, as will be hereinafter more fully described.

Figure 1 represents a. vertical section of the, oven, through the line a: a: of fig.

Figure 2 is a sectionof fig. 1, through the line 3; 3/.

Figure 3 is a verti. al section of fig. 1, on the line 2 1.

Similar letters of reference indicate corresponding parts.

The heat and gases from the blast-furnace enter the oven through the aperture A, which aperture A. is

opened or closed, in whole or in part, and the current of heated gases regulated by a sliding door or damper, B, which is operated by chains, 0,-and windiass-shaft, D, as seen mo'redistinctly in fig. 3.

The heated gases are discharged into the chamber E.

F is an arch over the chamber E, with apertures through it, as seen at 9.

On this arch the ore to be desulphurized or prepared is first placed. 6

The perforated arch allows the heat to act freely upon the are thus placed, where it is subjected to a high temperature before it is discharged into the roasting-chambers.

The heated gases pass from the chamber E into the chamber B through the aperture J, and from thence out through the aperture K.

In the use of the are called sulphur-ct of iron, great dificulty is experienced in reducing it in the blastfurnsce without some preparatory process, which generally is a method'hnown as pile-roosting."

This process of roasting or desulphurizing involves unnecessary expense, while there is so greats discharge of heat from the top of thc'furnacc. I 4

Besides, the result of such roasting is very imperfect and unsatisfactory.

I therefore propose to avoid both the expense and the above-mentioned impcrfcct roasting, by utilizing the heutedgascs or surplus heat, which escapes at or near-the top of tho-lilast furnaccs. i

Asbefore stated, the heat from the blast-furnace is introduced .into the chamber E'through the aperture A;

The ore is placed, in the first instance, upon the grated arch-F, it being introduced through proper aperturcs in the will from above. t

The spaee'above the arch, marked L, is kept filled with ore. v

The finer particles will pass through the arch into the chamber E, from which they may be removed after they have become suiliciently heated, and before they have become vitrified or injured, which finer particles ofore are replaced with fresh orc from above. I

This removal iii-accomplished through properly-constructed working-apertures iu-thc wall, withbars suitably constructed for the purpose. i l

The larger pieces or lumpsof ore will pass over-tho grated aroh, bsing subjected to the action of the heat at the some time, and pass into the chamber 11 through the ap'eaturo L, where they arc subjected to the, action of the heat as desired.

' 1n and n indicate the -working"- doors. I

The arrangement and operation of the suspended damper B enablome to control and regulate the heat with great-exactness.

It is necessary to'control the heat in the ovens or chsmbers during the operation of roasting, to'prevent injury to the ore.

For this purpose, the damper should be so arranged that it can be readily adjusted according to the intensity of the heat and the condition of the-ore.

Having thus described my invention, I claim as new, and desire to secure by Letters Patent- 1. In combination with n dcsulphurizing-furn'aee or oven for preparing iron ore for smelting, the sliding door pr damper B,srrs.nged end opera-ted substantially as described. I I

2. In combination with a desnlphnrizing-furnsce, for the purposes mentioned, the grated or perforated arch F, substantially as described.

' 3. The combination of the arch F, the chambers E and H, the apertures J and L, and the damper B, substsntisliy as and for the purposes described.

4. A blunt-furnace, so constructed that the surplus heat or gas escaping from the same is utilized, thereby desnlphnrising, preparing, or roasting the ore, preparatory to smelting, substantially ns-hersin set forth.

In testimony thst I claim the foregoing, I have hereunto set my hand, this 16th day of July, 1868.

' CHARLES MELLINGEB. Witnesses;

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