T H E J O U R N A L 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 .
876
RECENT INVENTIONS.
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Nov.,
1911
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Reported by C. L. Parker, Solicitor of Chemiral Patents, hIcGill Building, Washington, D. C.
Manufacture of Cement from Furnace-Slag. U. S. Patent No. 998,358. This is a process for the manufacture of cement from liquid furnace slag or the like. Referring to the accompanying illustrations the drum has behind it another drum $, and a third drum a* is arranged above the drums and %', The glowing liquid slag is conducted and the admixture to the drum 2 by a trough or channel is led through a trough or channel 2 terminating near the circumference of the said drum. This drum pulverizes the material in the well known manner, and throws part of it against
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tact with this liquid in such a manner t h a t the gas does not escape and is absorbed and returned again t o the electrolyte. The liquid or material used should be one which will absorb chlorin gas and readily give it up. Tetrachlorid of carbon is a liquid which can be used and is especially suited for this purpose. The inventor is Mathias Pier, of Schlachtensee, Germany, assignor t o E. I. du Pont de Nemours Powder Company. Apparatus for Electrochemical Treatment of Ores. U. S. Patent No. 991,695. This invention consists in apparatus for treating gold and other ores for the extraction of their metallic contents by means of a n electric current operating in conjunction with a chemical solvent such as cyanid. Provision is usually made for circulating the treatment liquid upwardly through the ore and through precipitation boxes. For this purpose, there is provided, a storage tank 7 from which liquid is delivered t o a pipe 8, the mouth g of which is raised above the tank. The pipe 8 connects with a chamber, IO, in the bottom of the tank, from which a number of perforated distribution pipes, 11, radiate under the filter 3. Near the top of the vat x x a draw-off pipe, 1 2 , conducts the liquid to the
the drum E' and part of i t against the upper drum az. The rotate in the direction indicated in the drawing drums 2' and by the arrows, so that the material on which they act is thrown from one t o the other, and is in this manner very intimately mixed. The repeated impact of the material against the rapidly rotating drums causes it to be reduced to a fine state of pulverization, and owing t o the fact that the ingredients are brought into more intimate contact with each other complete agglomeration results. The inventor is Wilhelm Lessing, of Troisdorf, Germany. Method of Producing Halogen-Oxygen Compounds by Electrolysis. U. S. Patent No. 998,982. This is a n improvement in the method of producing halogen oxygen compounds by electrolysis, which consists in allowing evolved chlorin gases to escape from the cell, absorbing the same in a liquid, which is not miscible with the electrolyte, and which absorbs and readily gives up the chlorin gas and returning the gas t o the electrolyte. The electrolyte is maintained a t a constant level by adding to the neutral electrolyte a liquid which is not miscible with i I
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the electrolyte but which readily dissolves chlorin. This liquid should be previously saturated with chlorin. The gases developed, particularly chlorin, are brought into intimate con-
precipitation boxes 13 after passing which flows to a sump, 1 4 , and is pumped back to tank 7 . The current is passed through the ore in the same direction as the liquid; or in other words the anode is placed at the bottom of the vat and the cathodes at the top. The anode 15 is shown positioned in chamber IO. Beneath the filter 3 and supporting the same is a heavy metallic netting, 16, which forms a sort of supplementary anode for distributing the current over the ore.
