US75339A - Island - Google Patents

Description

@uitrit tatrs' @utenti @Hita GEORGE F. WILSON, OF EAST PROVIDENCE, RHODE ISLAND, AND EBEN NORTON HOBSFORD, OF CAMBRIDGE, MASSACHUSETTS.

'Letters Patent lVol 75,339, dated .March 10, 1868.

IMPROVEMENT IN APPARATUS FOR GONGENTRATING ACID PHOSPHATE 0F LIME.

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TO ALL WHOM IT MAY-CONCERN l Be it known that we, GEORGE F. WILSON, of East Providence, in the county ot' Providence, and State of Rhode Island, and EBEN NORTON Honsronn, of Cambridge, in the county of Middlesex, and State of Massachusetts, have invented a new and improved Mode of. Concentrating the Solution of Acid Phosphate of Lime; and we herebydeclare that'the following is a full and exact description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon.

The object of this our linvention is to facilitate the economical and careful concentration of soluble acid phosphate of lime, and its conversion, by the addition, from time to time, of neutral phosphate of lime, to an acid of the requisite strength und' qualities for domestic and other uses in the arts, as described in. Horsfords patents.

In order to conduct this process on a large scale, it is essential that, as evaporation proceeds, fresh quantities of liquor be added. It is necessary to stir the liquor from time'to time, `as 'the neutral phosphate of lime or ground white bones are added, both to prevent adhesion to the bottom ofthe -evaporating-vessel, and to facilitate the escape of carbonc-acid gas, which is contained in small quantity in the burned bones. This evolution of carbonic-acid gas is sometimes so rapid that, taken in connection with the ebullition, if not carefully watched, liquor would be thrown out and lost. To prevent this loss, and also to prevent the adhesion of the acid to the bottom ofthe evaporating-vcssel, and generally to keep in the power of the operator the entire con trol of the' process, so as to produce a superior article, our experiments have demonstrated the necessity of conducting the concentration in small iron kettles lined with porcelain, and the further necessity of having an independent re under each separate kettle, so that the fire may be regulated or instantly withdrawn, according to the condition of the liquor in each individual kettle. To accomplish these ends, we have invented the sys tem of boiler-furnaces, of which- Figure 1 presents a perspective view,

Figure 2 a. plan, and

Figure 3 and Figure 4 vertical sections, respectively, through L M and'R S of tig. 1.

The fire-pot o, over which the porcelain-lined kettle c is supported, is a short cast-iron hollow cylinder oi tube, z'z', (fig. 4,) with a ange, n n, projecting inward, for the support of the fire-brick lining A A. We employ also a short thick re-brick tube, having' the shape of the {ire-pot, and used in lieu of the encasing ironA tube.l The bottom of the tire-pot is a movable grate, with a handle, g, so as to be instantly withdrawn, and the fire dropped into the ash-pit below, if necessary. A passage-way or flue, b, at the top of the fire-peto, g. 3 and fig. 4, gives special communication from each fire-pot into and through the common ue T to the chimney, shown in iig. 2. The lire-pot is surmoun'ted by -a cast-iron plate, g q', having a hole Ato receive the kettle 7c. for evapo-A ration. p is thev ash-pit; g, the handle of the movable grate. T, iig. 2 and g. 4, is the common ue, communicating on the one hand with the fire-pot ilues, and on Vthe other with the chimney.

In practical operation, one 'man attends a bench of twelve kettles. The liquor is taken from a. tub or kiln,- marked to hold, between two levels, one near the top, and the other near the bottom, one hundred and twenty gallons by actual measure. The kettles are filled at thc commencement toltwo-thirds their capacity, covered withwooden ,covers, and placed `over the fires. As soon as boiling commences, the covers are removed. The liquor is added as evaporation proceeds, and with the ground white burned bones, the latter in calculated pro portion, varying inversely with the specific gravity of the liquor. If the -heat becomes too great, the kettle may be lifted from its place, and supported farther from the iire upon slender iron bars introduced under tho sides, while a draught over the top of the fire, -instead of through it, reduces the heat. The fire is renewed by,

lifting each kettle from' its seat and adding fresh coal. When the liquor has been concentrated to a'certain definite point, it is necessary that no further concentration should take place. At this point the ire under the individual kettle may be dropped into the ash-pit below, and the concentration stopped. t this stage it requires to be stirred a short time to accomplish certain necessary chemical changes as it cools. To this end it is removed from the re-pot. Y Y

The arrangement above detailedk makes it possible for one operator to `attend a bench of twelve kettles, and

preserve the individuality of each kettle in the tirne and heat required for the concentration and nishing-process due to each kettle.

The ire-pot, whether constructed of an iron cylinder lined with fire-brick, ns shown in fig. 4, or of a firebrick tube only, must he surrounded with a space for air; otherwise the heat of the fire will break the furnace, and require constant repairs. The space is shown in the drawings. I

We claim, and desire to secure by Letters Patent ci' the United Statesv l. The new and improved method or process of concentrating the acid phosphate-of-lime liquor by mean s of the apparatus constructed and arranged substantially as and for the purposes above described.

2. We claim also the use of metallic evaporatng-kettles lined with porcelain, for coneentratiifigy the solution of acid phosphate of lime, in the manufacture of Horsfords pulverulent phosphoric acid. i.

3. VWe claim the improved hre-pot, substantially as described, that is to say, consisting of fire-brick, lining a short metallic tube, or a short continuous fire-brick tube, with a surrounding air-space, in connection with thc use of the porcelain-lined kettle, for concentrating acid phosphate-oflime liquor. i

4. The nnovahle grate, in combination with the lire-pot and porcelain-lined kettle, substantially asand for thelpurpose above described.

5. The arrangement of the series or bench of single liettles above described, having a separate lire for each, in themanncr and for the purpose set forth.

-GEO. F. WILSON, E. N. HORSFOR Witnesses:

WILLIAM Heinen', W. H. l\lcGrRENEP.Y.y

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