Electrochemical and metallurgical industry . ome apprehension asto the possibility oi using a suitable material has hitherto pre-vented its introduction. Where no objection exists to its use. iron is, of course, thematerial generally used for filter press plates and frames. Thelarge majority of makers employ cast-iron plates, either di-rectly supporting the filter cloths, or covered with perforatedsteel plates, which give a better support to the cloths and pro-l- ng their life. The Niles-Bement-Pond Company have latelyintroduced a rather radical departure, by building up_ their June, 1905.] EL
Electrochemical and metallurgical industry . ome apprehension asto the possibility oi using a suitable material has hitherto pre-vented its introduction. Where no objection exists to its use. iron is, of course, thematerial generally used for filter press plates and frames. Thelarge majority of makers employ cast-iron plates, either di-rectly supporting the filter cloths, or covered with perforatedsteel plates, which give a better support to the cloths and pro-l- ng their life. The Niles-Bement-Pond Company have latelyintroduced a rather radical departure, by building up_ their June, 1905.] ELECTROCHEMICAL AND METALLURGICAL INDUSTRY 221 plate from a corrugated steel panel and a cast-iron frame. Thistype was described in the issue of December, 1904. of thisjournal. The only possible objection to the use of steel isthat it is more readily attacked by some liquors than is theskin of cast-iron plates, and that steel in contact with thecast iron sets up electrolytic action. The fittings on iron presses, viz.: the outlet cocks for the. WOODEN FILTER PRESS. filtrate and the cloth unions, are generally made of bronze orbrass, to prevent rusting or the possibility of sticking. Whenthese materials cannot be used, e. g., with alkaline or cyanidesolutions, these parts can easily be made of cast iron, steelor malleable iron. In a large number of cases, howe\ er, iron cannot be used,either because the liquor to be filtered is acid, or because it isabsolutely essential to preclude any possibility of contaminat-ing the solid matter by iron oxide, e. g., with barytes, blancfixe, china clay, etc. These requirements may be met bymaking the plates and frames of the press of an alloy or metalnot attacked by the acid, such as gun metal, phosphor bronzeor aluminium, or else of wood. Gun metal presses, when; they can be used, have the advan-tage of great strength and of Ijeing suitable for hot liquors,but their cost is very considerable. The frame work of thepress is always made of
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