US79504A - Improved metal-foundees bi-aokim - Google Patents

Description

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\ V Letters Patent No. 79,504, dated June 30, 1868.

IMPROVED METAL-.IE'OUNDERS BLAGKING.

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TO ALL WHOM IT MAY: CONCERN:

In the process of refining petroleum, parading coal, shale, and other mineral oils andtors, sucli as asphalte and bitumen, by distillation, and after nearly all, or all, the liquid and gaseous portions or products have been driven off, there is left in the still a pasty or, dry residue or coke, which consists principally if not entirelyiof carbon. Imake metal-founders blocking of the said residneor coke, and thereby utilize it. This metal-founders blackingI propose to employ inthe place of the unctuous powdery substance known as blocking, and used for coating theinnersurfacesof moulds formed to receive liquid iron or other metal, for mixingxvith loam, making black-wash, and for other foundry purposes. a a

My mode of treating or preparing the above-mentioned residue or cokeyso as to render it uniformly suitable for the purpose above mentioned, con'sists of reducing it to a state of fine mechanical division or powder, by grinding, sifting, or blowing, but I would have it understood that I prefer the grinding process, employing horizontal bnrrstones, edge runners, or rolls.

With some residues or cokes, and with nearly all those from mineral oils, subjected to the distillatoiy pro:

cess to the ordinary extent, I hare't'ound it necessary, before reducing them to powder, to subject them to heat or calcination before grinding or-otherwise reducing them to fine powder. In effecting this I place the said residues or col (e in a closed oven or retort'-a retort such as is used in the manufacture of coal-gas answers well the material being operated on to a dull red heat, for a period of from one to four hours, according to circnmv stances. Those residues or cokes which leave the still in the dryest condition require oalcination for the shortest period, and vice versa; in ordinary practice two honrs will be sufficient. After calcination, I'withdraw the material, preferably into vessels from whichair is excluded. Withdrawal from the retort or even into vessels open to or into the air, I would have it understood, does but very little injury.

,Having now described the nature of my said invention, and particularized the mode of carrying the same into beneficial effect, in such terms that others acquainted with the mannfacturelwill be enabled to carry the invention into use, Iwould have it understood that what I 'claim, is-- Utilizing the residue or coke left from mineral oils other like substances in stills,'after the .distillatory process, by employing it for metal-founders blacking, substantially in the manner here-inbefore described.

In testimony whereof, I have hereunto set my name in. presence of two subscribing witnesses.

JOHN OARRINGTON SELLARS.

' Witnesses:

Joan T. KING, E. J. Casement.-