US386836A - Process of manufacturing sublimed lead pigment from galena ore - Google Patents

Description

(No Model.)

G. T. LEWIS. PROCESS OP MANUFACTURING SUBLIME-D LEAD PIGMENT FROM GALENA ORE.

latente @WW1/Leases UNITED STATES PATENT OFFICE.

GEORGE T. LEVIS, OF PHILADELPHIA, PENNSYLVANIA.

PROCESS 0F MANUFACTURING SUBLIMED LEAD PIGMENT FROM GALENA ORE.

SPECIFICATION forming part of Letters Patent No. 386,836, dated July 31, 1888.

Application filed December 7, 1886. Serial No. 220,942. (No model.)

To a-ZZ whom it may concern:

Be it known that I, GEORGE T. LEWIS, of Philadelphia, State of Pennsylvania, haveinvented a new and useful Improvement in the Process of Manufacturing Sublimed Lead Pigment from Galena Ore, of which the following is a true and exact description, due reference being had to the accompanying drawing` which forms part hereof.

Heretofore the manufacture of lead pigment from galena has been carried on in the manner set out in several patents granted to me and E. O. Bartlett, either separately or jointly, by directly snbliming galeria ore, the galeria being thrown upon a hot fire by a blast of air, which blast of air is forced into thc mass of ore and fuel, or by blowing powdered galena ore into red-hot retorts. It has also been made by reli ning the waste fumes and flue-dust of lead smclting furnaces. In all these cases a solid fuel has been used, and its use has been found in many respects very disadvantageons, the mineral impurities of the coal (ashes) and the irregularity in feeding being liable to discolor the pigment; also, the silicious ashes cause a loss of lead, a portion of the lead being thrown into the slag. The use of retorts has also been found disadvantageous on account ol' their great expense. By my discovery l am enabled to obviate all these objections.

I take powdered galcna orc, and this is ntimatelymixed with natural or generated gas or liquid hydrocarbomand this admixtnre burned in an igniting-chamber. The galeua will be completely oxidized; and this is carried off by an exhaust and forced into receptacles of textile fabric, where it is collected.

In the drawings, C represents the hopper, into which the powdered ore is placed. This hopper has an outlet, d, and against this ontlet a blast of air, D, is blown. The gas is caused to enter through the channel A, and at the point a the gas is mixed with the finelydivided ore blown by thc blast. The finelydivided ore, gas, and air are blown through the reverberatory-shaped chamber B, which is preferably lined with basic material. In this chamber the gas is ignited, by which means the lead ore is oxidized. Any coarse galena falls to the bottom of this chamber and is removed. The oxidized ore is carried into the settling-chamber E.` Any coarse material or heavy particles fall t0 the hopper F and are removed. The fan J draws the finely-divided particles of oxidized ore from the iguitingchamber through the cooling pipes H, and drives them through the pipe M into the bags K, of textile fabric, where it is deposited.

Any liquid hydrocarbon can be used in place of the gas, and when it is used I do away with the gas-channel A and mix the finely-divided Ore to be heated with the liquid hydrocarbon in the hopper C, and the finely-divided orc so Saturated is blown into the chamber B, where the hydrocarbon is ignited, and the operation continues in the manner heretofore described in this specification.

By this admixtnre of air, gas, or liquid hydrocarbon and pulverized ore prior to their introduction into the combustionchamber, I am enabled to cause the air and gas or liquid hydrocarbon to become so intimately mixed with each other prior to combustion that when combustion commences its effect on the ore is more perfect and rapid on account of the close connection ofthe ore and gas or liquid hydrocarbon with each other.

I do not intend to claim, broadly, the use of gas as a fuel inthe manufacture of lead pigments.

Having now described my invention, what I claim as new, and desire to secure by Letters Patent, is-

The process of manufacturing subliined lead pigment from finely-divided galena, which consists in forming acomponndcurrentofi ntimately-adinixed gas, air, and finely-divided galena before entering the combustionchamber, in-

tlaniing said current at the point of entrance into said chamber, maintaining the resultant salts in suspension by the air-blast while being forced through said chamber, cooling the material obtained by the combustion of the gas and galena, and finally depositing thelead salts by forcing them into receptacles of textile fabric, substantially as set forth.

GEORGE T. LEV IS.

Witnesses:

R101-ID. S. CHILD, Jr., FRANK CROWN.

Images