US789371A - Ore-roaster. - Google Patents

Description

No. 799,371. PATENTED MAY 9, 1905, J. W. R. LAXTON.

ORE ROASTER.

APPLICATION FILED JAN.19, 1905.

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No,'789,371. PATENTED MAY 9. 1905.

v .T. W. R. LAXTON.

ORE ROASTER.

APPLICATION-FILED JAN.19, 1905.

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/ His/"1am No. 789,371. PATENTED MAY 9, 1905.

J. W. R. LAXTON.

ORE ROASTER.

APPLIUATION FILED JAN. 19, 1905.

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iviirnn ramps Patented May 9, 1905.

OHE-ROASTIER.

SPECIFICATION forming part of Letters Patent No. 789,371, dated May 9, 1905.

Application filed nuary 19, 1905. Serial No. 241,76L

To all whom it may concern:

Be it known that 1, JOHN \VILLIAM RYDER LAx'roN, a citizen of the United States, and a resident of Lynn, in the county of Essex, State of Massachusetts, have invented certain new and useful Improvements in Ore-Roasters, of which the following is a full, clear, and exact description.

Referring to the drawings forming part of this specification, Figure 1 is a side view of the apparatus complete. Fig. 2 is a side sectional view on line Y Y on Fig. 3. Fig. 3 is a sectional view through the line X X in Fig. 2.

The main part of this ore-roaster consists of a hollow drum 1, preferably of considerably greater diameter than axial length, containing a considerable number of pockets in its periphery and a means for supplying a high degree of heat within it. Said pockets 2 are open peripherally, but otherwise closed, as shown in Fig. 2, a slight space being allowed between adjacent pockets.

The means for supplying heat consists, preferably, of a semicylindrical fire-pot 10, fitting within the roaster-drum and supported at its inner end on a trunnion 13, carried by the side 6 of said drum, while its outer end is supported by suitable fixed framework 14, as shown in Fig. 3. The fire is built upon the grate-bars 11, carried by said firepot, a door 15 giving access thereto. Said drum is revolubly supported atits side 6 by a comparatively small hub 7; but upon its side 5 is formed a large hollow hub 1, each of said hubsbeingrevolubly held within friction-rolls, preferably three for each, the rolls 30 of the hub 7 being suitably supported by the fixed framework, while the roll 31 is designed to be elastically pressed against the hub. A similar arrangement is provided for the hollow hub 1, the rolls 32 being supported by the framework-section 14 and the roll 33 pressed down upon said hub by means of the lever 34, pivoted at 35 to the framework, but having its opposite end drawn down by the spring 86.

As shown in Fig. 3, the side 6 bellies outward to a considerable proportion beyond the flange 1" of the drum 1, thereby allowing a space between such side and the pockets 2,

while above the upper part of the drums periphery rises a hood 21, having an outletconduit 20, leading to any suitable receiver C for the fumes rising from the roaster. In addition to this hood there is a second hood, comprising, mainly, a diaphragm 16, penetrated by the hollow hub 1 and inclosing be tween itself and the side 5 a space into which are received the products of combustion from the fire within the drum. This is provided with a suitable smoke-flue 18, passing to any desired point. To permit the escape of said products of combustion to said space, a hole 9 is provided between each two adjacent pockets 2, as shown in Figs. 2 and 3, the same coming quite close to the periphery of the drum.

As additional exit 1 form each pocket with a tubular passage 3, reaching entirely through it in a direction parallel with the axis of the drum. Consequently the heated gases rising from the fire first strike the surfaces of the upper pockets, heating the same to a high degree, and then pass to the tubular passages 3 and the openings or holes 9 and through the same to said space 17. As shown in Fig. 2, the heat must traverse the entire peripheral surfaces of the pockets to reach the openings 9, while the passages 3 allow the heat to circulate past one radial face of each pocket and thence through the interior of the pocket itself.

The operation of this machine is as follows: The crushed ore being delivered through the conveyer 2). from any suitable source, as the ore-crusher A (indicated in Fig. 1) is received in the pockets 2 as the latter are revolved beneath the extremity of said conveyer. Each pocket being thus partially filled in turn continues to retain such contents until the drum 1 has made substantially a semirevolution, (in the direction of the hands of a watch, and such contents are bygravity delivered into the conveyer 23 and carried on to the pulverizer by which the ore is prepared for the amalgamators. During this journey of the ore in the pockets 2 the steady turning of the latter through an arc of practically one hundred and eighty degrees causes the crushed material to become thoroughly intermixed by the descent,

through gravity, of the particles continuously raised into a position of unstable equilibrium. In other words, the floor of the pockets being rough the consequent friction prevents the quantity of ore in each pocket from sliding bodily along to reach the lowest part thereof newly brought about by the turn of the drum, and consequently the particles themselves must tumble or How one over another to reach such lowest point in the turning pocket. This flowing or tumbling of the ore particles causes them to be continually intermixed to present to the heated floors of the pockets practically every such particle. In this way the ore is thoroughly heated and all volatile substances contained therein are expelled before each pocket has completed its journey from the conveyer 22 to the conveyer 23.

In addition to the heat imparted to the ore through the floor of the pockets is that communicated thereto from the surfaces of the tubular passages 3 and still further aiding in the thorough roasting of every particle of the ore.

As shown in Fig. 2, the pockets 2 are somewhat elliptical, with the major axis of each radial with respect to the drum 1. This brings the tube 3 in each case nearer the sides than the bottom of the pocket in which it is located. The reason for this is that when each pocket is directly over the center of the drum it is of a consequence receiving the most intense of the heat from the fire beneath and can hence transmit heat to a correspondingly greater depth of ore than can its sides, which do not receive the flames so directly.

IVhat I claim as my invention, and for which I desire Letters Patent, is as follows, to wit:

1. An ore-roaster consisting of a drum revolving on a horizontal axis, ore-receiving pockets in the periphery of said drum, a heatproducing means within said drum, and a hood located over said drum to receive the fumes arising from the roasting ore.

2. An ore-roaster consisting of a drum revolving on a horizontal axis, ore-receiving pockets in the periphery of said drum, a heatproducing means within said drum, a hood located over said drum to receive the fumes arising from the ore being roasted, and a hood located to receive the products of combustion from the ire within said drum.

3. An ore-roaster consisting of a drum revolving on a horizontal axis, ore-receiving pockets in the periphery of said drum, each said pocket being substantially cylindrical with its axis parallel with that of said drum, and a tubular passage in each said drum and means for supplying heat within said drum; said tubular passages being arranged to receive the products of combustion at one end of each thereof and discharge through its other end exterior to the drum.

I. An ore-roaster consisting of a drum revolving on a horizontal axis, ore-receiving pockets in the periphery of said drum each separated a short distance from its neighbors, passages through said pockets opening into the drum at one end of each and discharging externally, openings through the side wall of said drum near its periphery between said pockets discharging in the same direction as said passages, means for supplying heat within said drum, a hood located to receive the fumes arising from said pockets, and a hood located to receive the products of combustion from said passages and openings.

5. The combination with a hollow drum formed with peripheral pockets and a hub projecting from each side wall of the drum, one of such hubs being enlarged and hollow, of friction-rolls supporting said hubs, a semicylindrical lire-pot located within said drum and hollow hub, a pivotal support carried by the drum for the inner end of said fire-pot, and alixed support for its outer end, gratebars supported by said fire-pot, means for the escape of the products of combustion through a side wall of said drum in close proximity to said pockets, and means for separating the fu mes arising from the ore being roastechfrom the said products of combustion.

6. In an ore-roasting apparatus, a hollow drum revoluble on a horizontal axis and having a series of pockets in its periphery; each pocket being formed with one side continuous with one side wall of said drum but with a space between the opposite side and the other side wall of the drum. the remaining wall of each pocket being one continuous curve with its axis parallel with the axis of the drum, and a tubular passage being formed through each pocket parallel with its said curved wall but farther from the bottom of the pocket than from the curved surfaces more removed from said bottom.

In testimony that I claim the foregoing invention l have hereunto set my hand this 29th day of November, 1904.

JOHN WILLLMII RYDER LAX'ION.

I'Vitnesses:

JOHN J. MAoMAHoN, A. B. UPHAM.

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