US13416A - Improvement in making zinc-white - Google Patents

Description

J. E. BURROWS.

Making White Zinc.

No. 8,416. Patented Aug. 14. 1855.

AM. PHOTO-LITHILCO. N.Y, (OSBORNE'S PROCESS.)

iINrrnn Srarns Farmer wrrrcag JOHN E. BURROXVS, OF NEXVARK, NEW JERSEY.

IMPROVEMENT lN WlAKlNG ZlNC-Wl-HTE.

Specification forming part of Letters Patent No. ESQ ill] 5, dated August 14, 1855.

To aZZ whom it may concern:

Be it known that I, JOHN E. BURROWS, of Newark, Essex county, State of New Jersey, have invented a new and useful improvement in furnaces for the manufacture of white oxide of zinc from ores of zinc and franklinite; and I do hereby declare the followingto be a full description of the same.

The nature of my invention consists in combining, with a furnace made of brick, iron, or other suitable material, a series of perforated grate-bars and an air-chamber underneath having a force air-pipe inserted in one side of it for the purpose of forcing a blast of air into the closed air-chamber to support .the combustion of the carbonaceous material mixed with the ores of zinc in the perforated grate-bars, in consequence of the air being more evenly diffused throughout the ores by passing through the perforations of the gratebars. But to describe my furnace for manufacturing white oxide of zinc from the ores of zinc or franklinite more particularly, I will refer to the accompanying drawings, forming a part of this schedule, the same letters of reference, wherever they occur, referring to the same parts.

Figure 1 is a perspective View of the furnace. Fig. 2 is a cross-section of the same. Fig. 3 is a plan view of the base of the furnace, showing the grate-bars.

Letter A is the case of the furnace, which may be made of brick, iron, or other material. The upper end of this case is contracted, so as to reflect the heat of the furnace back upon the ignited ores, and also to allow an exhaust-pipe to be attached thereto to col lect the oxide of zinc as it passes off in the state of vapor in suitable receptacles for that purpose, and well known in the process of manufacturing white oxide of zinc.

Letter Bis the base of the furnace, made air-tight, or as nearly so as practicable, when the door 0 is closed up.

In the side of the air-chamber B is a pipe, D, having a throttle, E, in it, which connects with a bellows-pipe, used for forcing the blast of air into the furnace. On this base, at its junction with the case of the furnace, are arranged a series of perforated grate-bars, F, set as near together as practicable, to prevent the air from escaping between them too freely instead of passing through the perfo- I rations of the grate bars. These bars are made in any of the usual forms suitable for the purposes required. I prefer their being made rather heavier than grate-bars are ordinarily made, so as to allow a greater number of perforations in them than could be ob tained if made thin and the air pass between them; also for the purpose of making the perforations larger at the under side of the bars than at the top, so as to admit the air more freely, and by its contraction diffuse it more thoroughly throughout the mass of ore and coal.

Letters G, H, and I are three doors in the side of the furnace for feeding the furnace and drawing out the cinder, 6c, from the furnace when to be cleaned out.

The operation of my furnace and the charging of the same for the manufacture of white oxide of zinc from ores of zinc or franklinite is by mixing the ores in a pulverized state with carbon pulverized or in lump, either in the form of anthracite coal, coke, or char coal, and in this mixed state place them upon the grate-bars, or where-lump coal is used in combination with the mixed pulverized ores and carbonaceous inateriahthen to put on alayer of lump coal and then a course of the pulverized ore and carbon, and so on till the furnace is charged. Through this ignited mass of fuel and ore a blast of air, either hot or cold, is forced either in a continuous stream or in intermittent jets by means of a force-bellows, which fills the air-chamber with air, and as the ash-door is scaled up the air is forced through the perforations of the grate-bars in a diffused and more even way than could be obtained if allowed to pass between solid grate-bars to more perfectly promote the combustion of the coal mixed with the ore, and thereby liberating the zinc in the form of vapor, which by contact with the oxygen of the atmosphere is' condensed into white oxide of zinc drawn off from the top of said furnace or lected in bags, which retain the oxide of zinc, but allow the gas to escape through them.

Having now described my invention and its operation, I will proceed to state what I claim and desire to secure by Letters Patent of the United States.

Vhat I claim therefore isstove by an exhausting apparatus and col- The manufacture of white oxide of zinc from ores of zinc or franklinite prepared, substantially as above set forth, by means of a furnace having perforated grate-bars, and an airohaniber underneath them, in which hot or cold blasts of air are forced to unite with the ignited mass of fuel in a diffused state by passing through the perforations of the grate-bars to liberate the zinc in the form of vapor, in manner of construction and mode of operation substantially as set forth.

JOHN E. BURROVVS. XVitn esses:

CHARLES L. BARRITT, WILLIAM C. SQUIER.

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