File:Bulletin (1905) (14593181100).jpg

Identifier: bulletin78cali (find matches)
Title: Bulletin
Year: 1905 (1900s)
Authors: California. Division of Mines and Geology California. State Mining Bureau. Bulletin
Subjects: Mines and mineral resources Geology
Publisher: San Francisco (etc.)
Contributing Library: Gerstein - University of Toronto
Digitizing Sponsor: University of Toronto

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e burner (see Plate XXXVI-A) sets in an air-tight door. Air for combustionis allowed to enter near the tailings discharge-door below, and must pass up over thehot tailings before reaching the combustion cliamber, being thus pre-heated. Atr>rcsent, steam is used for atomizing tlie fuel-oil. but compressed air will later besubstituted. The burned rock from the furnace discharge drops into an inclined binbuilt of concrete.—July 26. 191S. *-See Eng. & Min. Jour., Vol. 102, Oct. 7, 1916, p. 634. QriC(\SILVER RESOURCES. 251 This furnace is stilted not to work economically on material coarserthan j inch. Up to 58 tons have been treated in 24 hours; but it seemsto do its best work at between 40 and 50 tons. Feeding and discharg-ing are both automatic. The feed hopper is shown in Photo No. 54,while the housing for the discharge may be seen in the lower left-handcorner of Photo No. 55. A steel ore-car is kept under the dischargechute, and when filled is trammed out by hand to the dump.
Text Appearing After Image:
Fhoto No. S3. Herreschoff Multiple-hearth Furnace at Senator Mine of NewAlmaden Company, Santa Clara County. By reason of the dust raised and thrown into the fume circulation as the ore is mechanically scraped from one hearth to the next, a bother-some accumulation of dust was at first obtained in the condensers. To correct this and keep the dust from passing into the condensers, a Cot-trell fume precipitator, called the hot treater was installed between the furnace and the first condenser. (See Photo No. 35, ante.) To prevent the mercury from condensing in this treater, the temperature of the gases (as already mentioned) is kept above 600° F. on leaving the furnace. As a precaution to recover any quicksilver which mighthave condensed in case of irregularities occurring in the furnace oper-ation, the hot-treater dust is run into a settling tank before being dis-charged to the dump. Following the last condensing chamber Is a second Cottrell precipitator

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