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Download pdf Reports, with Accompanying Papers Volume 14

یکشنبه 28 تیر 1394

نویسنده: John Hardin |

Reports, with Accompanying Papers Volume 14 by Iowa Geological Survey
Reports, with Accompanying Papers Volume 14
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Author: Iowa Geological Survey
Number of Pages: 152 pages
Published Date: 01 Mar 2012
Publisher: Rarebooksclub.com
Publication Country: Miami Fl, United States
Language: English
ISBN: 9781130892932
File size: 28 Mb
Download Link: Reports, with Accompanying Papers Volume 14
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1904 Excerpt: ...gases remain in the clay to this elevated temperature is not certainly known. It is believed that CO2 from the carbonate of iron and S03 from lime sulfate may thus become entrapped and swell the clay. It has been further suggested that oxygen set free by the reduction of ferric oxid to the ferrous condition may be the cause of bloating, since this phenomenon is nearly always accompanied by such reduction. It is evident that any gas that may be generated in the interior of a body of viscous clay would produce the bloated condition with which clay workers are all familiar. It is known, that the carbonate of lime or of iron and the sulfates will not break up readily and evolve their respective gases if the atmosphere which surrounds them is already charged with these gases. The expulsion of water vapor is similarly influenced. Hence in a kiln already filled with combustion gases and water vapor the tendency is least for the clay to yield the gaseous compounds which it is desirable to get rid of. The character of the fuel gases depends on the kind of fuel employed and the draft. The more the fire gases are diluted by the admission of air, while still continuing a gradual increase in temperature, the more favorable are the conditions for the removal of gases from the clay. The removal of carbonaceous combustible material is likewise favored by an excess of air, which means strongly oxidizing conditions. The water smoking period is best conducted, therefore, with plenty of air to dilute the fire gases and remove the water and other vapors that are beginning to leave the clay. The ideal fuel for use during the whole dehydration period, and especially during the earliest stages, is one free from sulfur and as low in water as possible. Soft coal, the commonest of fu...

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