US370326A - Albeet dboit - Google Patents

Description

(No Model.) 2 Sheets-Sheet 1.

A. DROIT.

eALGINlNG APPARATUS.

No. 370,326. Patented Sept. 20, 1887.

N. Fzvzns. Pmmumegnphef, washington. n. cv

(No Model.) v2 sheets-sheet 2.

A.` DROIT.

GALGINING APPARATUS.

10,370,320 Patented Sept. 2o, 188m AUnire STATES ATENT Erica.

ALBERT DROIT, OF PARIS, FRANCE.

CALCINING APPARATUS.

jSPIECIPICATON forming part of Letters Patent No. 370,326, dated September 20, 1887.

1 Application filed Julyli, i887. Serial No. 244,237. (No model.)

To all whom it may concern:

Be it known that I, ALBERT DROIT, a citizen of the Republic of France, residing in Paris, in said Republic, have invented a new and useful Improvement in Apparatus for Calcining Carbonate of Soda and other Substances, of which the following is a specification, reference being had to the accompanying drawings. A

This invention has especially for its object the calcination of the bicarbonate of soda obtained by the ammonia process. tions to be fulfilled in such calcination are as follows: First, it is necessary to treat large quantities of the bicarbonate at a time; sec- -ond, the bicarbonate is a bad conductor of heat, and to heat itin all its parts it is necessary to stir it to prevent the formation of crusts on the heated surface; third, the appara tus should permit the collection of the gas and vapor disengaged; fourth, the product having to be calcined highly to have a convenient density, the apparatus is quickly destroyed, and it is necessary to construct it as durable as possible to facilitate the repair.

4 The apparatuses heretofore employed to cal eine by direct heating are generally formed of a cast-iron kettle or of a horizontal cylinder. These apparatuses are fixed. The heating being direct, the fire strikes upon arestricted surface and the iron is quickly burned. The soda is stirred by very complicated agitators,which incompletely scrape the heated surfaces, because of the rapid deformation which the apparatuses are subject to under the influence of the heat.

My invention consists in the combinatiom' The condi-v an arched furnace, F, heated by a fireplace which ranges along the whole length of one side of it. This cylinder is mounted on four rollers, Gi, keyed upon two horizontal shafts, Adr'. One of these shafts receives a continuous rotary motion, which -it communicates to the cylinder C* by the intermediation of the roll ers Gi The axis of the cylinder C* is traversed by the shaftB*,which receives a rotary motion in a reverse direction to that of the cylinder. This shaft passes through astufiing-box in one end ofthe cylinder, said stuffing-box being furnished with asbestus packing. It is supported at its other extremity by a fixed tubular bearing, Tik, inserted through the other end of the cylinder. A second stuffing-box packed with asbestus prevents the escape of gas at this end.

The shaft B* carries two cast-i ron blades, Lit, carried by arms L, articulated by pivots r* toiianges B,keyed on the shaft. These blades by their own weight -scrape the surface of the cylinder during aboutahalf-revolution, andin order that their action may be more energetic they are formed with numerous teeth in the direction of their length, the teeth of one blade corresponding with the spaces on the other blade.

The tube T* carries a nozzle, Mik, which is keyed to it, and which debouches in the upper part of the cylinder.

The charging and discharging of the bicarbonate into and from the cylinder are made by two doors, Ph, provided in one of the heads, and furnished with means for making them airtight. The exit of the gas,which is disengaged during the reaction, takes place through the nozzle Mii and the fixed tube Tik.

A shaft, Nik, receiving motion through a pulleyand belt, carries an endless screw which gears with a wheel, 0*. Two pinions, H* HW, mounted on the same shaft with the wormwheel 0*, communicate their movement, the first to the shaft B* through the intermediation of the wheel I* on the said shaft, and the second to the cylinder C* by the intermediation of the wheel Kf. This latter pinion H2* may slide on its shaft in order to permit the throwing out of gear when it is required to charge or discharge the cylinder.

ICO

The advantages which result from the emthe rotary shaft fitted to bearings in the ends ployment of this apparatus are considerable; of said cylinder and having flanges B Within the rotary cylinder is heated uniformly, and the said cylinder, the arms F', pivoted to said 15 consequently is more durable. The deeomanges, the Scrapers IRF, carried by said arms,

5 position of the bicarbonate willbemore rapid, vand the inclosing-furnace F, having the fire- `because the heating-surface is greater. The place on one side, substantially as herein dearticulated and toothed stirrers produce an scribed. energetic stirring and prevent the formation of adherent erusts of soda.

1o What I claim as myinvention, and desire to Witnesses:

secure by Letters Patent, is- PAUL CURALF,

The combination of the rotary cylinder 0*, LOUIs QUn'rREHoMMEs.

ALBERT DROIT.

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