US151165A - Improvement in apparatus for the manufacture of white lead - Google Patents

Description

UNIT

CHARLES J. SEVIN, OF NEWN YORK,

PATENT QF-rrcn Specification forming part of Letters Patent No. 151,165, dated May 19 1874; application filed May 9, 1874.

.To all whom it may concern Be it known that I, CHARLES JULIUs SEviN, of the city of New York, county and State of New York, have invented a new and useful Apparatus for the Manufacture of \Vhite Lead; and I do hereby declare the following to be a full, clear, and exact description thereof, which will enable those skilled in the art to make and use the same, reference being had to the accompanying drawing, forming part of this specification, in which drawingl Figure 1 represents a sectional plan of my apparatus. Fig. 2 is a longitudinal vertical section of the same in the plane w 00, Fig. 1.

Similar letters indicate correspondin parts.

This invention relates to an apparatus for the manufacture of white lead, in which two revolving drums are employed, which are supplied with granulated lead and acetic acid, and through which is passed a current of carbonic acid. The carbonic acid, before being admitted to the corroding-drums, is heated, so as to increase its decomposing effect. The carbonic acid is produced by burning coke or other suitable material, and a pump serves to draw the same from the furnace through a purifier, and then to force it through a heater into the corroding-drums. The surplus carbonic acid passes from the corroding-drums into a mixer, which is supplied with a solution of acetate of lead from a stationary corroding-vat.

In the drawing, the letter A designates a furnace, in which is produced carbonic-acid gas by burning coke or other suitable material. The carbonic acid thus produced is impure, and in order to purify it I pass it through one or more purifiers, B. This purifier is filled with pure water, or other suitable material, and from its bottom or side extends a pipe, a, to the top of the furnace A, while a pipe, 12, which emanates from the top of said purifier, connects with the suction port of a doubleacting pump, 0. The exhaust-port of this pump connects, by a pipe, 0, with a coil, d, situated in the interior of a heater, D, which is heated by steam or otherwise. When the pump is set in motion, therefore, the carbonic E E; said pipe c being made to spread in two branches, each of which passes into the hollow gudgeon f of one of the drums. The gudgeons f f, at the receiving ends of the drums, connect, by pipes g 9 extending through the entire length of the drums, with the discharge-gudgeons h 71 and these pipes are provided with partitions i, (see Fig. 1,) and with holes j k on each side of these partitions, so that the carbonic acid which is not used up in said drums passes through the holes R to the dischargegudgeons h h. From these gudgeons extend pipes l l to the mixer F, the object of which will be presently more fully explained. The drums E E are conical, being largest at the ends supported by the dischargegudgeons h h, and they are geared together by cog-wheels m a, the cog-wheel n being mounted on a shaft, 0, to which a revolving motion is imparted by steam or other suitable power. Each drum is provided with a discharge-openin g, 19, near its large end, and these dischargeopenings are separated from the remaining spaces of said drums by perforated partitions or sieves q.

The metallic lead from which the white lead is to be manufactured is granulated by casting it in small pieces, like shot; it is then placed into the drums E E, and a suitable quantity of vinegar or diluted acetic acid is added.

set in motion, and while the drums revolve a current of heated carbonic acid 1s forced through each of said drums. By the combonic acid, the lead is transformed into carbonate of lead, which, being insoluble in the liquid contained in thedrums, is precipitated and caused to accumulate in the large ends of the drums, the metallic lead being prevented by the sieves g from passing to said large ends. At suitable intervals the white lead, together with the liquid, is drawn off from the drums, the white lead is allowed to precipitate, and the clear liquid is returned to the drums E E. The surplus carbonic acid, or that portion of the carbonic acid which does not combine with the lead in the drums E E, passes ofi' through the holes 70 in the pipes g g, and through the pipes Z 1 into the mixer F, which communicates by a pipe, r, with the corroding-vat G.

Then the drums are closed, and the shaft 0 is bined action of the acetic acid and of the can i This vat is filled with granulated lead and diluted acetic acid, and the liquid acetate of lead formed therein'is allowed to pass into the mixer F, where it is brought in contact with the carbonic acid escaping from the pipes. These pipes are provided with rose-heads s at their discharging ends, (see Fig. 2,) so that the carbonic acid is spread and brought in intimate contact with the liquid; and in the mixer is an agitator, t, which serves to facilitate the contact of the carbonic acid with the liquid.

By this apparatus I am enabled to convert metallic lead into white lead in less than eight hours; and the cost of the process is comparatively little, since the acetic acid can be used over and over again for a long time.

The process of converting the lead into carbonate of lead is materially facilitated by the heated carbonic-acid gas.

What I claim as new, and desire to secure by Letters Patent, is-

1. In an apparatus for the manufacture of white lead, the combination of a carbonic-acid generator, one or more purifiers, a pump, a heater, and two revolving drums, receiving and discharging the heated carbonic acid through their hollow gudgeons, and provided with sieves to prevent the metallic lead from passing oil with the liquid, all constructed and operating substantially in the manner and for the purpose herein shown and described.

2. The combination of amixer, I and a corroding-vat, G, with pipes l I, through which escapes the surplus carbonic acid from the drums E E, substantially as set forth.

CHARLES JULIUS SEVIN.

Witnesses W. HAUFF, JAMES L. NORRIS.

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