Sug′ar-fil′ter.
（
Sugar-making.) The vessel employed for cleansing and decolorizing the defecated sirup by the aid of bone-black.
Those commonly employed are about 10 feet high by 4 feet in diameter, and open at the top; three are shown in the illustration.
Near the bottom is a man-bole a, and below this an iron grating
b, upon which a piece of filter-cloth is laid, and the vessel then filled with charcoal to within about a foot of the top. Sirup is then admitted through the pipe
c until the charcoal has absorbed nearly all the coloring matter which it is capable of doing.
The supply of sirup is then shut off, and cane-juice from the defecators is let on through the pipe
d expelling the sirup; the power of the charcoal having been previously exhausted, its action upon the juice is simply mechanical.
When this has continued to flow some time, it is shut off, and pure water is let in from the pipe
e. This, in turn, drives out the cane-juice, and is allowed to flow until it no longer extracts
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sufficient saccharine matter to pay for concentration.
Several filters are employed, so that while one is filtering sirup, the second may be filtering cane-juice, and the third be cleansed by water.
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Sugar-filtering apparatus. |
The liquor and juice are drawn off by the pipe
f, which discharges into the gutters
g h through the swivel-joints
i. The water is discharged through the cock
j into the gutter below.
See also bag-filter, Fig 522; centrifugal filter, Figs.
1213, 1214. See also bone-black, pages 327, 328.
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Sugar-furnace. |
