Publisher's Synopsis
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. 1902 edition. Excerpt: ... the bag-house. By the term bag-house is meant a structure provided with "woollen or cotton-cloth bags for filtering and collecting various kinds of fume. It is customary to force it from the inside to the outside of the bag, 30 feet long and 18 inches wide when distended. Circular bags are strongest and have the maximum surface exposure. It is immaterial whether the gases are forced into the top or bottom, both methods being employed. Where oxide of zinc is manufactured the main delivery pipe should have branches, and on the bottom of the pipe thimbles, to which are attached bags 18 inches in diameter and of varying lengths. These extend down to the floor, and the oxide removed from time to time. A painstaking examination of various patents and the literature concerning them show that, under proper conditions, lead is quite volatile; that galena ores are readily volatilized; that sulphate of lead is also volatile; that the carbonate, oxide, phosphate (especially chloride, bromide, and iodide) readily go into fume, the solids of which may be recovered. Filtration through cloth or other textile fabric is the only method the success of which has been fully indicated by long experience and practical tests. By the term flue-dust is meant all solid particles of appreciable size in the products of combustion. It can be settled in long chambers, but neither lead nor any other fume can be settled entirely by any system of chambers devised. Fume is vaporized metals and metaloids, and the individual particles are so small that most of it is lost from the chimney where flues and chambers alone are used. The rationale of the so-called bag-house is to collect volatile matter by withdrawing smoke with an exhaust fan, and forcing it through a textile...
