Rock Products Volume 23, Nos. 14-26 (Paperback)

This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1920 edition. Excerpt: ... CO. It will combine with the necessary oxygen to form carbon dioxide, however, quite readily and will in so doing burn with a pale blue flame and give off considerable heat. It is a colorless gas, slightly lighter than air, without taste and with but little odor. It is a quite poisonous gas on its own account and not by reason of the exclusion of oxygen. Carbon dioxide does not occur in nature but forms one of the principal constituents of water gas. If carbon dioxide is passed over red hot carbon it gives up half its oxygen to the carbon and forms with the latter carbon monoxide according to the reaction. C+CO, =2CO This reaction plays an important part in the manufacture of producer gas as will be explained further on. Carbon monoxide may be looked upon as a compound of carbon and oxygen which lacks the full amount of oxygen to satisfy the carbon. Carbon normally has a valence of 4 and hence requires 2 atoms of oxygen to satisfy it--oxygen having a valence of 2. Carbon monoxide may be considered, therefore, as a gas in which carbon is seeking the extra atom of oxygen. Many oxides are reduced to the metal by carbon monoxide thus, it carbon monoxide is passed over heated iron oxide, iron and carbon dioxide are produced Fe=O1 + 3CO = 2Fe + 3CO= (To be continued). July Export of Cement XPORTS OF CEMENT during the month of July totaled 156,713 barrels, valued at $529,886, according to figures compiled by the Department of Commerce for the Washington Bureau of ROCK PRODUCl'S. During the same period, our imports amounted to ll,286,000 pounds, valued at $70,255. Vhile no details are available as to the countries from which cement was imported, the export figures show that most of the cement shipped out of the country was destined for Cuba, .