T H E JOL-RKAL OF I N D U S T R I A L A N D E N G I N E E R I S G C H E M I S T R Y .
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Jan., 1 9 1 2
R E C E N T INVENTIONS.
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Reported by C. L. Parker, Solicitor of Chemical Patents, McGill Building, Washington, D. C.
PROCESS OF AND APPARATUS FOR MAKING CLAD MET ALS U. S. Patent No. 1,004,673,to John E. Monnot, New York City. Assignor to Duplex Metals Company, of New York City. This invention relates t o processes of and apparatus for producing clad metals, and i t comprises a process of producing clad metals wherein a core or base of ferrous or like metal is given a dense, cohering, impervious coating of a n unlike, highmelting, ductile metal by electro-depositing said unlike metal thereon in a molten state; all as more fully hereinafter set forth and claimed.
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METHOD OF PRODUCING CRYSTALS.
U. S. Patent No. 1,004,858,to Herbert H. DOW, Midland, Mich. Assignor to the Dow Chemical Company, of Midland, Mich. This invention relates to the manufacture of chemical products of a crystalline nature. The process consists in producing crystals by conducting the evaporation in two or more successive stages, and mechanically moving the precipitated crystals through the said stages in a a’
direction passing from a late stage of evaporation toward and through the earlier stages whereby the crystals formed in the later stages are washed in the purer liquor of earlier stages while evaporation is progressing therein. The accompanying illustration s h o m apparatus in which the process is carried out. PROCESS O F REFINING LEAD AND LEAD ALLOYS. U. S. Patent No. 1,006,323, to Leland E. Wemple, St. Louis, Mo. Assignor one-half to Hoyt Metal Company, of St. Louis.
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The process consists in immersing a high-melting metal body in a solution of a salt of an unlike metal and thereby producing a striking coating of the unlike metal, and then making such metal body a cathode in a bath of fused electrolyte containing a dissolved ductile high-melting different metal, such bath being maintained a t a temperature above the melting point of such high-melung metal. The accompanying illustration shows apparatus in which the process is carried out.
This invention is a process for the removal of contaminating metals or foreign elements from pig lead and from alloys of lead and antimony, of lead and tin, and of lead antimony and tin, and particularly to the removal of arsenic antimony, or tin, from lead, and to the removal of arsenic from antimonial lead or antimony-lead alloys, and from lead-tin-antimony alloys without the removal of either antimony or tin from the alloys.
The process consists in bringing the lead, or lead alloy containing impurities, or foreign elements, while in a molten state, in intimate contact with the hydroxid of an alkali, such as hydroxid of sodium, or hydroxid of potassium whereby the foreign elements are attacked by said hydroxid while the metallic lead itself is practically unattacked, and therefore remains in the metallic state, the contaminating metals undergoing a chemical change which is regarded as oxidation or a t least partial oxidation, combining with or becoming held mechanically by the hydroxid. The process may be carried out in the apparatus shown in the accompanying illustration
