Title: The Cuba review
Identifier: cubarevie10muns (find matches)
Year: 1907-1931. (1900s)
Authors: Munson Steamship Line
Subjects:
Publisher: New York : Munson Steamship Line
Contributing Library: New York Botanical Garden, LuEsther T. Mertz Library
Digitizing Sponsor: The LuEsther T Mertz Library, the New York Botanical Garden

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THE CUBA REVIEW 35
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Filter presses. Central of Francisco Sugar Co., Francisco, Cuba. Bateria de filiros, prensa del Ingenio Francisco, Francisco, Cuba. FILTER PRESSES OF TO-DAY Owing to the ever increasing demand for â filter presses, efforts are being made to im- prove _on the original type and as a result some remarkable machines are being offered. But it is a peculiar fact that, with all the ingenuity that has been exerted, the "old original" filter press still holds its own with the new t^'pes. Of course there have been improvements in the construction of the old types, with- out changing the principles involved. These improvements have resulted in more rapid filtration and less breakage and repairs. In some few cases, perhaps most strik- ingly in the cyanidation of gold and silver ores, a new type of press has been evolved which is a decided improvement on the â¢original. The improvement consists in a method of sluicing out the cake from the frames without opening the press. This eliminates the most objectionable feature in a filter press. But there are a number of other, so called, improved filter presses, all of them more or less patented, which are beneficial. Some of the patented presses have been installed and operated side by side with the "old original" type and have shown better results. But let us look a little closer into the reason for this. The improved filter press is installed and run by an expert who understands the very best conditions under which it should be operated. He naturally gets the best pos- sible results which this particular press can produce. These results are compared with those obtained from the old original type which is probably run by a handy man who knows no more 'than to force the material into the press as fast as his pump will de- liver it and continue until he can get iio more to filtrate through the press. Now in all probability there is an exact pressure under which this press should be charged which would give the best results. That pressure may be fifteen pounds, or it may be one hundred and fifty, while in pomt of fact the press may have been operated under seventy pounds pressure which might give the worst possible results. But the press has been run that way for the last ten years and there is nobody about the place who has had the authority or interest to try any experiments. Therefore, the better results obtamed from the "patented press" are not due to the "patent," but to the fact that the man who was running it "knew how." It is prettv safe to say that as perfect a filtration can be obtained with the old type of filter press and at the same cost of operation as with the modern patented article.âLetter to The Cuba Review.

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