File:Bulletin (1910) (14778003611).jpg

Identifier: bulletin146unit (find matches)
Title: Bulletin
Year: 1910 (1910s)
Authors: United States. Bureau of Mines
Subjects: Mines and mineral resources Mines and mineral resources Mining engineering
Publisher: Washington U.S. Govt. Print. Off. (etc.)
Contributing Library: Gerstein - University of Toronto
Digitizing Sponsor: University of Toronto

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Text Appearing Before Image:
SIDE ELEVATION OF A TRIPLE-EFFECT VACUUM PAN. (COURTESY OF MANISTEE IRON WORKS CO., MANISTEE, MICH.) BUREAU OF MINES BULLETIN 148 PLATE XVII
Text Appearing After Image:
END ELEVATION OF TRIPLE-EFFECT VACUUM PAN. (COURTESY OF MANISTEE IRON WORKS CO., MANISTEE, MICH ) VACUUM-PAX PKOCESS. 105 As the solution boils it is in constant circulation, which may beassisted by a revolving wheel, which creates a downward current andconsequently a return upward current through the copper flues inthe steam belt. Thus salt crystals formed in the brine as it passesthrough the flues are carried by the propeller and gravity downwardtoward the boot. As there is a constant tendency for the copper flues to becomeclogged with salt the pans are boiled out frequently in order to keepthe heating surface of the flues perfectly clean and at their maximumefficiency. The brine drawn from the pan before boiling out goeseither back to the settlers or*to another pan. As bittern is formedrapidly in the vacuum-pan process the brine becomes impure after afew admixtures with such residual liquors and has to be entirelydiscarded at intervals. The boiling out is usually done with fresh wa

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