File:The Science record; a compendium of scientific progress and discovery (1874) (14595582509).jpg

Identifier: sciencerecordcom1874beac (find matches)
Title: The Science record; a compendium of scientific progress and discovery
Year: 1872 (1870s)
Authors: Beach, Alfred Ely, 1826-1896
Subjects: Technology Industrial arts
Publisher: New York, Munn
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Smithsonian Libraries

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facing the workingplatform is closed by a stationary door hung before it inthe usual manner. Although the passage for the intro-duction of gases in combustion is separated only by a ver-tical partition wall from the passage through which theproducts of combustion are led away, the chamber is heat-ed very perfectly, care only being taken that the gasesenter the chamber with a certain velocity, which sendsthem forward toward the door and makes them reach theexit passage only after having traversed the rotativechamber to and fro. This rotative furnace is worked as follows: The ore to be smelted is broken up into fragments notexceeding the size of peas or beans; to it is added lime orother fluxing material in such a proportion that thegangue contained in the ore and flux combines with onlya little protoxide of iron into basic and fluid slag. If theore is haematite, or contains silica, I prefer to add aluminain the shape of aluminous iron ore ; manganiferous iron CHEMISTRY AND METALLURGY.
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76 SCIENCE RECORD. ore may also be added with advantage. A charge of say20 cwt. of ore is put into the furnace when fully heated,while it is slowly revolving. In about forty minutes, thischarge of ore and fluxing material will have been heatedto bright redness, and at this time from 5 cwt. to 6 cwt. ofsmall coal of uniform size (not larger than nuts) are add-ed to the charge, whilst the rotative velocity is increasedin order to accelerate the mixture of coal and ore. Arapid reaction is the result: the peroxide of iron being re-duced to magnetic oxide begins to fuse, and at the sametime metallic iron is precipitated by each piece of carbon,while the fluxing materials form a fluid slag with the sili-ceous gangue of the ore. The slow rotative action isagain resorted to, whereby the mass is turned over andover, presenting continually new surfaces to the heatedlining and to the flame within the rotator. During the time of this reaction, carbonic oxide gas isevolved from the mixture of ore

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