US530125A - Walter s - Google Patents

Description

(No Model.)

W. S. PIERCE. GALGINING A1\PARAT.US.

N0. 530,125. Patented Dec. 4, 1894.

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W'ALTER S. PIERCE, OF NEW YORK, N.,Y.

CALCINING APPARATUS.

SPECIFICATION forming part of Letters Patent No. 530,125, dated December 4, 1894.

Application filed March 6, 1893. Serial No. 464,732, (No model.)

To aZZ whom it may concern.-

Be it known that 'I, WALTER S. PIERCE, a

' citizen of the United States, residing at New York city, in the county and State of New York, have invented a certain new and useful Improvement in Oalcining Apparatus, of which the following is a specification.

My invention relates to such calcining apparatus as is "provided with a rotatable cyl-' inder, and consists in combining with such cylinder a retort in. which the treatment of {the material, partially carried out in the cylinder, is completed. p

The object of this partof my invention is a device capable of affording the material undergoing treatment a varying degree of heat as it passes from the entrance to the exit end thereof; and further to increase the durability of the apparatus by providing that the and tumbled sufficiently to insure good treatment without oaking or burning; and in providing at the discharge end of the apparatus a conveyer which will carry off the material after it leaves the retort in a regulatedway.

The object of this portion of my invention is to provide means whereby there will be insured a regular and uniform treatment of material; it being obvious that by providing a feeding device at the entrance end of the rotatable cylinder, which regulates the quantity of material delivered, and a conveying device at the exit end of the apparatus, which is regulated with reference to the feeding device, the material will be caused to pass through the calcining apparatus in regulated quantities, practically uniform at any instant of time, and hence that the material will relar and uniform product.

be specifically pointed out in the claims.

In the accompanying drawings, forming part of" this specification, Figure l is a side elevation, in section, of my improved appa: ratus. Fig. 2 is an elevation thereoflooking in the direction of the arrow, Fig. 1; and Fig.

3 is a section on the line 3-3, Fig. 1, showing the retort.

A represents the masonry which supports the apparatus.

B represents the calcining cylinder, two of 6 5 which may be employed, as shown in Fig. 2. 0 represents a retort of the usual material, and D represents a furnace.

The cylinder B, as shown, is supported on a shaft 1) by spiders c, the shaft being jour- 0 through the cylinder, and at the same time to thoroughly tumble and agitate the same. A fuller description of a rotatable cylinder combined with such blades and ribs will be found in an application filed by me on the 31st 'day of October, 1891, Serial No. 410,482. I do not, however, in the present application intend to limit my apparatus to the use of these blades and ribs, as other feeding devices for the cylinder may be in existence or be devised which will answer to attain the object now in view. At each end the cylinder is fitted into a plate of metal E, E which serves to receive and hold by suitable bolts or otherwise a drum or cap F, F, which closes the cylinder ends, and at the same time af- 5 into a suitable box or other receptacle, which receptacle may be provided with a pipe leading to the atmosphere. I have not shown this apparatus, as its construction will be obvious. .The object is to carry off the steam H 4 MM.

generated at the entrance end of the apparatus from the material undergoingtreatment and to catch in the box or receptacle above referred to the particles which are carried off by the steam, afterward letting the steam exit to the atmosphere. Asmall doort in the cap F may be employed to withdraw the material that accumulates therein.

G is a hopper, which furnishes material to a screw-conveyer H, which feeds the same in regulated quantities to the feed-pipe I, which delivers the same into the cylinder, as shown. At the exit end of the cylinder, a pipe J conveys the material treated in the calcining cylinder to the retort G, where, after treatment, it is carried off in regulated quantities by the screw-conveyor K. It will be seen that there will be a regular flowot' material through the apparatus, governed by the relation of the feed and discharge conveyers, which in turn may be regulated by moving them faster or slower. Gone pulleys are preferable for thus governing the speeds of the conveyers.

'lhe retort cylinder 0 is shown as inclined with relation to the cylinder B, and I prefer this arrangement. It rests at one end upon an arch or deflector L, which runs under the cylinders B from the exit to near the entrance end thereof. At the other end, the retort rests on a portion of the masonry work A. Over the retort (J is an arched wall or de' fleetor M, and under it an arch or deflector N, the latter protecting the said retort from the direct flames of the furnace, and the former serving to insure a circulation of heat around the said retort. The manner of supporting the wall M is best shown in Fig. 3.

The heated gases generated by the furnace D pass, as shown by the arrows, around the arch N, and into the space between it and the retort O, and around said retort into the space between the same and the wall M, thence pass the sides of the retort Fig. 3 into the flue beneath the arch L to near the entrance end of the cylinder B, thence around said cylinder and out at the stack P. It will thus be seen that the material to be treated, while in the calcining cylinder, is subjected to a lower degree of heat than while in the retort; that the cylinder is protected from being burned out, and the material is gradually subjected to increasing heat. By this means a superior product is insured.

In making use of my apparatus for the purpose of heating granular phosphate rock, which is the main purpose for which the said apparatus was devised, I found that it was necessary to make use of acylinder B of light material through which the heat could be readily conveyed, and in my first apparatus, I depended upon this cylinder to efiect the entire heating. I soon found, however, that while the entrance end of the cylinder did not become over heated in consequence of the heat being conveyed away bythe evaporation of the volatile matters in the material, that if the latter was maintained in the cylinder B long enough to become thoroughly dried, the necessary amount of heat applied to the cylinder 'would soon burn out the rear end from which the material passed. This led to the invention of the apparatus above described wherein a refractory retort is combined with the thin metal cylinder B, which in such case is made only of such size and subjected to such heat as is necessary in order to evaporate the main portion of the volatile constituents of the material treated, after which the material passes into the refractory retort, and is therein heated to any extent required.

I found other advantages incident to the arrangement described beyond those which resulted from increasing the durability of the cylinder B, and that was that while the heat necessary for the retort was very great and the gases passed from the retort furnace in a highly heated condition, the said heat was not wasted because such gases were available to heat the cylinder B to the desired extent necessary to effect the preliminary treatment of the material.

It will be seen that in the construction of apparatus illustrated and above described the heated gases from the furnace D are not brought in contact with the material to be treated, and therefore there can be no combinations of the said material with any of the said gases.

I claim- 1. In a calcining apparatus, an externally heated rotatable cylinder of metal with means for feeding material to and from the cylinder, and for heating the same, and a stationary retort of refractory material arranged in position to receive the material discharged from the cylinder, and means for heating the said retort to a high degree of heat, substantially as set forth.

2. The combination of the externally heated rotating cylinder of metal, and means for feeding the material to said cylinder, a stationary retort of refractory material arranged to receive the matter passing from the cylinder, a fire-place for heating the retort and a flue extending from the said fire-place beneath the said cylinder, substantially as set forth.

This specification signed and witnessed this 2d day of March, 1893.

WALTER S. PIERCE.

Witnesses:

GEORGE E. CRoUK, W. PELZER.

ICO

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