US78456A - Improved furnace for roasting ores - Google Patents

Description

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E. P. HUDSON.

Roasting Gres. No. 78,456. A PatemedJune 2,1358.

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Patented .lune 2, i868f roven/ZU? 'UNITED STATES PATEITWQgEloE.

EDNARD P. HUDSON, OF NEW YORK, N. Y.

IMPROVED FURNACE FOR ROASTING ORES.

Specification forming part of Letters Patent No. 73,456, dated June 2, 1868.

To all 'whom it may concern:

Be it known that I, EDWARD P. HUDsoN, of New York, in the county and State of New York, have invented an Improved Furnace and Resulting Process for Roasting and Dcsulphurizing Ores; and I do hereby declare that the following is a full and exact description thereof, reference being had to the accompanying drawings, making part of this specification- Figure l being a central vertical sect-ion of the furnace through the fire-chambers 5 Fig.'2,

sa horizontal section'thereof in a plane indicated by the line Fig. 1; Fig. 3, a vertical section, corresponding with Fig. 1, of a modified form of the furnace.

Like letters designate corresponding parts in all of the gures. The object of my invention is to thoroughly remove sulphur, phosphorus, arsenic, and other noxious substances from ores with economy, so that ores containing such ingredients, after treatment by my improved process, may be successfully reduced to their metallic bases in a pure state.

Three important results are attained by the construction of this furnace: First, ahigh degree of heat is secured, with economy in fuel, second, an excess of oxygen, the desulphurizing agent, is presented to all parts of the mass of ore without detractin g from the temperature; third, the ore, when sufficiently treated, is readily removed from the furnace without obstructing the continuous operations in the treatment of succeeding charges of ores.

Let A represent the interior or ore-treating chamber; B C, the Dre-chambers, and D the hearth of the furnace. The width ofthe chamber A, between the fire-chambers, should not be so great as not to allow a complete circulation of the heated air into the center of the mass of the ore.

First, the fire-chamber B, on one side, is located just above the upper edge of the inclined hearth D, opposite to the side where the treated ore is drawn out at the door g,- and the fire-chamber C, on the opposite side, is located at a higher level than the chamber B, so as to give sufficient room below for taking out the ores, and in order to more easily and effectuall y distribute the heat and air of the blast to the ore. The arrangement is substantially represented in Fig. l.

Second, the hearth D is inclined from below the lower Vhre-chamber, B, downward to the door g, where the ore is drawn out after treatment. This inclination of the hearth from one side to the other enables the treated ores, as they settle to the bottom, to be removed quite equally from the middle and both sides. It

also furnishes a chamber or reservoir, a, at the bottom of the main ore-chamber A, into which the ore, as it becomes completely desulphurized or treated, settles below the furnaces, wherein it can partially cool before being removed.

Instead of the singly-inclined hearth and fire-chambers at different heights, as shown in Fig. l, an arrangement indicated in Fig. 3 may be adopted. Here the hearth inclines both ways to two doors, g g, for removing the ore, and both fire-chambers, B C, are at the same height, at least entirely above the highest part of the hearth D, so that a chamber or chambers is furnished below the irecham bers, as in the first-described arrangement.

Third, air is introduced into the orecham ber through the hearth D, or near the same, at

the side or sides of the furnace, or at least below the fire-chambers, by a pipe or pipes, 7L, so that it is heated by the cooling ore on the hearth, whereby, in turn, the ore is assisted in cooling. Thus, also, the air is introduced in to the ore undergoing treatment without rst passing through the fuel, which would deprive the air of its oxygen, and thus prevent its becoming a desulphurizing agent, and thereby act in the most efficient manner for desulphurA izing the ore at the moment of being decomposed.

Fourth, besides the introduction of air as a desulphurizin g agent through the desulphurized ores in the cooling chamber or reservoir, atmospheric air is introduced into the ore through the fire-chambers B C, cach of which has one' or more pipes or passages, d, extend ing from the air-chamber b, below the tiregrate, into the space c above the fuel, through which the air is conducted in excess above the re without being decomposed in the fuel, and is thence forced, in a heated state, into the mass of ore by the pressure from the blastpipe f, which leads into the air-chamber below the fire. Y'

The pipe or passage d is controlled by a valve, so as to regulate the amount of free air thus admitted into the furnace, or cut it oi entirely; and the air passage or pipe or passages h is also provided With a Valve to regulate or eut ott the low of air into the furnace through or at the hearth. Thus free air may be introduced into the ore either at the bottom or above the lire chamber or chambers, or through both, or both may be cut off, as when first heating a charge of ore for treatment, or the amount and relative proportion of air at the different inlets may be regulated. This regulated-variation of the introduction of air 1s desirable, if not necessary, to the proper treatment of different kinds or qualities of ores, as Well as in different stages of the process of desulphurization.

What I claim as my invention, and desire to secure by Letters Patent, is-

1. Forcing heated air or oxygen, in addition to the products of combustion, through ores,

`tires, so as to be heated thereby before passing through the ores, substantially as herein specified.

4. The arrangement of one tire-chamber higher than the other, substantially as and for the purpose herein specified.

EDWARD P. HUDSON.

Witnesses;

SE'rH ALLEN, F. A. ALLEN.

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