US489254A - honman - Google Patents

Description

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IHONMAN & V. VULLIEZ. PROCESS OF AND APPARATUS FOR THE MANUFACTURE OF WHITE LEAD.

Patented Jan. 3, 1893.

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A. HONMAN 86 V; VULLIEZ. PROCESS 01E ANDAPPARATUS FOR THE MANUFACTURE 0F WHITE LEAD No. 489,254". Patented Jan. 3, 1893.

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Uwrrnn STATES ANDREW HONMAN AND VICTOR VULLIEZ, OF VVILLIAMSTOYVN, VICTORIA.

PATENT @nrtcn.

PROCESS OF AND APPARATUS FOR THE MANUFACTURE OF WHITE LEAD.

SPECIFICATION forming part of Letters Patent N 0. 489,254, dated January 3, 1893.

Application filed May 28, 1891. Serial No. 394,452. (No model.) Patented in Victoria September 24, 1889, No. 7,127, and

in Tasmania October 8, 1890, No. 857.

To all whom it may concern..-

Be it known that we, ANDREW HONMAN, surgeon, a subject of the Queen of Great Britain, residing at Electra Street, Williamstown, in the British Colony of Victoria, and VICTOR VULLIEZ, white-lead manufacturer, also a subj ect of the Queen of Great Britain, residing at Osborne Street, Williamstown, in the British Colony of Victoria aforesaid, have invented new and useful Improvements in the Process of and Apparatus for the Manufacture of White Lead, (for which the said AN- DREW HONMAN has obtained Letters Patent in the British Colony of Victoria, dated September 24:, 1889, No. 7,127, and for which we, the said ANDREW HONMAN and VICTOR VUL- LIEZ, obtained Letters Patent in the British Colony of Tasmania, dated October 8, 1890, No. 857,) of which the following is a specification.

This invention relates to a method of manufacturing white lead in which the roasted ore is subjected to the action of lead acetate, the clear solution from which has a stream of carbonic acid passed through it, and its object is to obtain white lead which is in finer crystals and more uniform in quality than when manufactured by the ordinary process.

It consists mainly in preserving the basic acetate of lead at a uniform temperature of aboutl Fahrenheit throughout the whole of the operation.

In manufacturing white lead by our process we take the ordinary galena and crush and wash it as in the ordinary manner. We then roast it in a reverberatory furnace which has a more than ordinarily large area of surface relatively to the fire-place, and this latter is provided with a boiler arranged immediately above it for the purpose of providing a supply of steam which is conducted through a pipe or pipes just beyond the bridge, so as to discharge a series of steam jets in the direction of and above the galena in course of roasting. By practical experiments it has been found that great advantages are attained by roasting the galena in the presence of steam.

Referring to the drawings, Figure 1 is a diagrammatic view of an apparatus for carrying my'process into effect. Fig. 2 is a View of one of the cylinders. the settling tank. Fig. 4 is a plan of the same. Fig. 5 is a view of the vat. Fig. 6 is a sectional View of the precipitating vat. Fig. 7 and S are sectional views of the drying apparatus.

The galena is suitably roasted to drive off the greater part of the sulphur. When this has been accomplished we remove it from the furnace and place it in one of a series of tinned copper cylinders (such as is shown in Fig. 2 of our drawings), F being a man-hole door through which the material is fed and G being a perforated false bottom covered with coarse linen, and H a man-hole door for removing the contents after they have been treated. I is a pipe for conducting a stream of hot neutral lead acetate into this cylinder, and J is a pipe at the bottom for the purpose of conveying this stream (which has then been converted into basic lead acetate) to a settling tank shown in Figs. 3 and 4. The hotlead acetate is supplied to this cylinder at about 15 Baum and is continued until it ceases to have any efiect on the material under treatment, which is ascertained by testing the solution discharged through pipe J.

The settling tank, which is represented in section and plan at Figs. 3 and 4, is divided into two parts by a vertical partition L, one part of which contains a series of baffle plates Z for the purpose of preventing the stream of liquid rising too rapidly to the top and by compelling it to pursue a circuituous course to give greater opportunities for it to deposit any solid matter it may hold in suspension. The overflow from this half passes into the second half in which there is a discharge pipe M made of india rubber or other flexible material and having its mouth supported by floats m so as to receive only the purer liquid which is at the upper part of the vessel. The clear solution of basic lead acetate thus be ing discharged through pipe M is conveyed into a vat constructed as shown in Fig. 5, said vat being lined with tinned copper and its bottom being made so as to converge toward the center. This we prefer to eifect by fill= ing up that portion of the vat marked 0 with cement. To the center of this vat we connect Fig. 3 is asection of a discharge pipe P which we provide first with a plug Q and secondly with a stop-cock Q so that both must be operated before the liquid can escape. To the plug Q is attached a rod q having a rack g at the top with which gears apinion g byoperating which theplug Q may be either opened or closed. This vat has a lid or cover R which is securely fastened down by means of two or more right and left hand screw-threaded rods rr provided each with a correspondingly screw threaded link 7', whereby the two parts of said rods may be drawn closer together or vice-versa, as will be well understood. The solution in this vat is kept at an even and regular temperature of 120 Fahrenheit or thereabout by means of a worm S into which steam enters at s, and the exhaust from which finds its exit at s. In this vat we also provide a worm T arranged spirally so as to be parallel to the cemented sides of the vat. This worm is perforated throughout its whole length so as to admit of the escape of a stream of carbonic acid which is conveyed to it from any suitable source by means of pipe 25, which of course is provided with a stop-cock t to cut oflf the supply wheneverneeded. Bypreferenceweforcethestream of carbonic acid through said worm by means of a pump, and the result of this proceeding is to cause the basiclead acetate to precipitatelead carbonate-white lead. When the solution, which is at first about 18 Baum, decreases to 15 Baum, the supply of carbonic acid is cut oif and a few minutes allowed for the precipitate to settle down to the bottom from whence it is drawn through the pipe Pand is then immediately replaced by a fresh quantity of clear basic lead acetate from the settling tank, shown in Figs. 3 and 4, so as to bring the solution again'to the density of about 18 Baum when the supply of carbonic acid is again turned on and the same operation repeated. The lead carbonatewhite lead-which is thus discharged through pipe P togetherwith its accompanying solution is conducted to a settling tank, where the white lead deposits itself and the clear solution at the top is pumped back to a cylinder (such as is illustrated in Fig. 2) and when the oxide therein has been entirely dissolved the sulphate of lead, which forms a portion of the residue, is dissolved by a solution of caustic soda, caustic potash, or ammonium acetate. The solution thus made is conveyed to a tinned copper pan, such as shown in Fig. 6, wherein it is preferably maintained at a fairly high temperature in order that finer crystals may be produced than would otherwise be the case,- and wherein the white lead is precipitated by means of a solution of carbonate of soda, potash or ammonium. The white lead thus produced either from the decomposition of the sulphate of lead or from the discharge from the vat (shown in Fig. 5) is first thoroughly washed and then dried in an apparatus shown in Figs. 7 and 8; This drier consists of a cast iron pan supported on a bed of bricks V, and the two heating flues V. This apparatus is provided with metal lids \V, which it will be seen are hinged at w, and are inclined at about forty-five degrees. The ends of the lids rest in a groove or channel X so that as the vapor condenses on the lids W it runs down into this channeland is conveyed away outside of the pan. This pasty white lead should be spread upon this pan three or four inches deep and kept there until thoroughly dried. hen dried it is broken up, pressed through fine sieves and packed for transportation.

Having now-particularly described and ascertained the nature of our said invention and in what manner the same is to be performed we declare that what weclaim is:

1. Thehereinbefore described processconsisting of reducing and roasting the galena, subjecting it to hot neutral leadacetate, conveying the resultant basic lead acetate to a settling tank, discharging the clear solution of basic lead acetate to a closed vat and maintaining it at an even temperature, and subjecting it to the action of carbonic acid to pecipitate the white lead,substantially as described.

2. The described apparatus consisting of a holder or receiver, a settling tank with connections from the receiver, a closed vat and a pipe connection from the surface of the solution in the settling tank to the vat, means for heating the contents of the vat, and means for supplying the carbonic acid thereto provided with a discharge, substantially as described.

ANDREW I-IONMAN. VICTOR VULLIEZ. Witnesses:

WALTER SMYTHE BAYSTON, WALTER CHARLES HART.

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