US1010356A - Manufacture of red lead. - Google Patents

Description

W. ECKPORD. MANUFACTURE OF RED LEAD.

APPLICATION ILED NOV.27,1909.

Patented NOY. 28, 1911.

UNITED'STATES PATENT OFFICE.

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. PARKER 85 CO. LIMITED, 01: LONDON, ENGLAND.

MANUFACTURE, or BED r Specification of Letters Patent. Pei tented Nov, 28, 1911: Application filed November 27, 1909. Serial in. 530,102.-

To all whom it may concern:

Be itknown that I,1.WII LIAM Ecmono, subject of theKing of Great Britain, residing at Rhyl, in the county of Flint, infthe Principality of Wales, England, have 1n- -vented certain new and useful Improvements in or Relating to the Manufacture ofRed Lead, of which the following is a. specification.

my invention for t 1e production of redlead from granulated lead; metallic lead powder, .oxid of lead, massicot or hthai'ge 1s a dry process, and yet no appreciable portion of lead oxid can escape into the open air to contaminate it.

In carrying the invention into effect, the granulated. lead, metallic lead. powder, oxid of lead, massicot or lith'arge, is supplied to a mechanical coloring oven preferably without being damped.- and preferably under a slight suction draft, so that if there be any leakage it will not be outward to the atmos- 'phere. I

After being partly converted into red lead in the coloring oven the product. is ground dry in an inelosed mill, with preferablyv a slight inward suction at the inlet of the mill, this grinding being to break up the powder and enable it to color quickly and more thoroughly. It is again colored and again ground dry in the same inanner, and again colored, and so on until the desired red lead is obtained. The sole object of the slight suction is that if there be any leakage it shall be in-.

ward and not outward.

The.operations' of coloring and grinding are rendered consecutive and continuous without any hand manipulation, and the accompanying drawings show one'apparatus by which the invention is carried into practical operation, in which,

Figure 1 is a diagrammatic view of the appar'atus;'and Fig. 2, a detailed view.

B is a'hopper to which the granulated lead, metallic lead powder, oxid of lead,

: massicot or litharge' is supplied, and which in its, turn supplies the elevator C incased by the casing D, from which there can'be no leakage, outward into the open air, and

. thence by the chute Eto the'pipe F, which ,revolves and-which distributes the granulatedlea'd; metallic lead, oxi'd of lead, massicot or litharge, to he bed of the coloring oven G. This oven has a circular bed, and is 3 be following roce'ss'which constitutes hoppers B and :pockets, into which the lead ,oxid'entersbyj i provided with'a vertical shaft H passingthrough the bottom of the oven, and carr ing the revolving arm I, which, carries t e scrapers J. I that they distribute the granulated lead,

metallic lead powder, oxid of lead, massicot' or litharge in the furnace on'the circularbed' These'scrapers are so arranged after it has been dischargedfrom the pipe F which revolves with the arm I. These scrapers J on the arm areso setthat they at one side of the. arm cut furrows of oxi or red lead made'by the scrapersonthe-other side of the arm, and are set at such an angle as to gradually worlrthe oxid from the center to the outside; The scrapers quBide, or farthest from the center collect and at each' revolution as they pass the hole Kdischarge a portion of the now partly colored-red leadinto the screw conveyer L, which feeds the incased elevator M, thus" liftin the partly colored red lead to the hopperto supply the incased grinder P. The ground redlead is discharged into the hopper Q, and-is sup plied to or near the center of-the' coloring" oven R-by the incased-elevator S and chute T. This oven with its arms I, scra rs'J and pipe F, is the sameas the oven and finished red lead is discharged-at'the'opening U into thedesired receptacle for-weigh ing or packing into barrels or other vessels, or the grinding and coloring can be repeated again and again as often as required by adding more grindingmills andlovens. ,Whenf' desired. 1 connect the chutes,-elevators, hop pers, ctcetera, with ducts at say pointa -X to a suction fan, so that'no pOivdeificsnsaPe, and any leakage of air shalhbe' inward and not outward.

The pipes Fconvey the lead-oxide! red lead close down on to the'bed of the 'oven', and so greatly prevent the raising of dust.

V is a revolvm drum at the bottom 'ofthe which is provided with gravity and the revolution of the druin dc livers the lead oxid from the pockets in regulated quantities, so that the conveyers C and S cannot et blocked with the rush of oxid-or red lea The elevatorsC'shownin the drawing are of the bucket type,;but I'do 'not confine myself to using bucket tale--- vators, as screw or other conve 'e'rs can-be used instead. Also, -insteado usin the vertical shaft grinder P, any other suitable ios grinder maybe used, such as one with horiiiio zontal 'or inclined shafts, or ball grinding mills, or other suitable dry grinding apparatus. When the lead oxid is fed by hand into the hopper B, instead of automatically from the oxid producer, then suction draft is indispensable at the hopper B.

,Fig. 2 shows an alternative arrangement.

for feeding the powder on to the oven bed F. In this, G is the brick bed of the oven, H the vertical shaft, I the revolving arm, and E the chute. @Th'e pi eF is in this case dispensed with, and a passage V. is formed in the shaft H. This passage, starting in the center of the shaft, is deflected toward 5 the side and has its orifice near the brick "bed. Thepowder delivered by the chute E passes through ,.this passage and is discharged on to the oven bed G at or near the center thereof.

The mechanical ovens need not be of the form shown. They may, instead of the fixed 'bed and the revolving scraper type, be made with a revolving be and fi'xed scraper, or of a revolv ng mclmed cylinder as used for roasting cement. The mechanical ovens. may

be muffled.

' In this process the usual. levigating and separating of the oxid of lead from the metallic particles aredispensed with, no water is used, and thus a greatsaving of heat and of'l'abor is effected, any metallic lead which I may bein the material being converted in the coloring oven first into mon'oxid and then into redlead, without any mechanical separation from the other material.-

I declare that what I claim is 2-- 1-. In the manufacture of red lead, subjecting the granulated lead, metallic lead powder, oxid of lead, massicot or litharge in a dry or floury state, to the action of heat 1 on the bed of a mechanical coloring oven, and either under atmospheric pressure or under a suction draft or pressure slightly below that of the atmosphere, and grinding the resulting part1 colored red leadin a a dry state under a s ight vacuum or suction, again coloring it on the bed of a mechanical coloring oven, and againgrinding it, the operations of alternate coloring and grinding being repeated as often as re uired to obtain the desired red shade of red ead.

2. The process of producing red lead from granulated lead, metallic lead powder, oxid of lead, massicot-or litha-rge, consisting in subjecting the material in a dry state to alternate treatments on the beds of mechanical colorin ovens and dry grindin as often as re uired until the desired sha e of'red lead is obtained, the lead oxid or partly formed red leadbeing conveyed from the coloring ovens to the grinding devices without exposure to the open air..

In witness whereof,I have hereunto signed my name this 17 day of November 1909, in the presence of two subscribing -witnesses.

G. C. DYMOND, H. WATSON.

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