US145713A

US145713A - Improvement in driers for lead

Info

Publication number: US145713A
Authority: US
Publication date: 1873-12-23
Anticipated expiration: 1890-12-23

Description

A. D. ARMSTBUN G.

Drers for Lead.

Patented Dec- 23,1873

UNITED STATES PATENT CEEIcE.

ANDREW I). ARMSTRONG, OF ALLEGHENY CITY, ASSIGNOR TO ARMSTRONG, FAWCETT 85 MCKELVY, OF PITTSBURG, PENNSYLVANIA.

IMPROVEMENT IN DRIERS FOR LEAD.

Specification forming part of Letters Patent No. 145,713, dated December 23, 1873; application led July 11, 1873.

To all whom Muay concern:

Be itknown that I, ANDREWD. ARMSTRONG, of Allegheny City, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Apparatus for Drying Lead; and I do hereby declare the following to be a full, clear, and eXact description thereof, reference being had to the accompanying drawing forming a part of this speciiication, in which- Figure l is a perspective view of my improved drying apparatus. the cover of the same being opened; and Fig. 2 is a longitudinal section of the same.

Like letters of reference indicate like parts in each.

My invention consists in the construction of an improved drying-kiln, for the purpose of drying White lead, in which heat is applied to the lower side by means of a jet of steam, and

which heat has been applied. This method requires several days for its completion.

To enable others skilled in the art to make and use my invention, I will describe its construction and mode of operation.

The carbonate of lead, or, as it is usually called, white lead,77 having been previously prepared in the usual way, is in the form of a coarse mortar, and while in this condition is ground very fine by means of a burr, in the usual way. In the operation of grinding', water is supplied. After being ground the lead is run into a vat, in which it is allowed to stand until the lead is precipitated to the botltom, and then the water is drawn oit' by means ing the upper compartment, a2. The steam escapes from the compartment al through the pipe d. The upper compartment, c2, is provided with a cover, e, which iits down over the steam-pipe d, and which has an opening, f, at one end. Opening into the opposite end of the compartment a2 is a hot-air pipe, g, the mouth g of which extends across the entire end of the compartment a2. The lead is placed in the compartment a2, and the lid e shut down and secured; then a jet of steam is injected into the compartment al through the pipe c,

j' at the opposite end of the kiln. The steam and air are supplied until the operation of drying is complete.

By means of this apparatus applying the heat not only to the under side of the leadchamber a2, but also directly to the surface of the lead, the operation of dryingl lead requires about lifteeu hours, while the old method occupied at least three days, and frequently more.

In order to economize fuel, I so arrange the steam-pipe inside of a suitable box that it shall heat the air, which is supplied by means of the blast for drying the lead in the compartment a2. The manner in which this can be done is familiar to the skilled mechanic. Y

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

A stationary drying -tank, a, divided hori- Zontally into two chambers, al and a2, the iirst being iitted with steam supply and discharge pipes c and d, and the latter with a broadmouthed blast-pipe, g, an exit, f, and a lid, c, substantially as described.

In testimony whereof I, the said ANDREV'T D. ARMSTRONG, have hereunto set my hand.

ANDREWT D.'ARMSTRONG.

Vitnesses v T. B. KEER, JAMES I. KAY.