Dec., 1911
T H E JOUR,\'AL
OF I N D U S T R I A L A N D E N G I N E E R I N G C H E M I S T R Y ,
959
upon one of the surfaces, permitting the tailings to remain in the solution. The process is carried out by apparatus shown in the accompanying illustration. PROCESS FOR REFINING AND DESILVERING LEAD. U. S. Patent No. 1,001,525,to G. P. Hulst, Omaha. A method of refining and desilverizing impure lead bullion, which consists in melting the impure lead bullion, crystallizing a portion of the lead from the molten bullion by cooling and
9
PROCESS O F MAKING ACETATES. U. S. Patent No. I,OOZ,OJ~,to H. 0. Chute, Cleveland, and K. P. McElroy, Washington, D. C. Assignors to Ligno-Chemical Company, New York. This is a method of preparing acetates from products of the digestion of woody fibers with alkali by heating such products under regulated conditions, and in recovering b6th the acetate formed, and the excess of alkaIine reagent.
agitation and separating the molten impure lead from the crystallized lead by mechanical pressure applied to the crystals, the impure lead being conducted away from the crystals. PROCESS OF MAKING CEMENT. U. S. Patent No. 1,001,582,to Carleton Ellis, of Larchmont, New York. Assignor t o Ellis-Foster Company, a Cor- j . poration of New Jersey. This is a process of making cement clinker, which consists in crushing cement raw material t o a coarse granular form, calcining the granulated material as a traveling stream, adding t o the calcines a quantity of water, sufficient t o substantially cool said calcines but insufficient t o materially slake them, in regrinding the cooled calcines and clinkering the reground material, said process being conducted throughout in a continuous and hon-cumulative manner. The accompanying illustration shows apparatus in which the process can be carried out.
An alkali solution is produced, consisting of woody fiber constituents: the same being absorbed by a material capable 01 doing so. The mass i s oxidized while in a,h e a t 4 state by diluted air, carbonizing by a higher heat qut of comact with air, and separating the carbonate and acetate of alkali from the carbonized mass. ,I
