Chemical engineering . e apprehension >*to the possibility of using a suitable material has hitherto pre-vented Its introduction. Where no objection exists ir> its iisc, iron is, of course, llmaterial generally used lor filter press plates and frames. Tn^large majority of makers employ cast-iron plates, either di-rectly supporting the filter .cloths, or covered with perforatedsteel plates, which give a belter support to the cloths and pflong their life. The Niles-Bemcnt-Pond Company have latcl)introduced a rather radical departure, by building up theif June, 1905.: ELECTROCHEMICAL AND ME
Chemical engineering . e apprehension >*to the possibility of using a suitable material has hitherto pre-vented Its introduction. Where no objection exists ir> its iisc, iron is, of course, llmaterial generally used lor filter press plates and frames. Tn^large majority of makers employ cast-iron plates, either di-rectly supporting the filter .cloths, or covered with perforatedsteel plates, which give a belter support to the cloths and pflong their life. The Niles-Bemcnt-Pond Company have latcl)introduced a rather radical departure, by building up theif June, 1905.: ELECTROCHEMICAL AND METALLURGICAL INDUSTRY. 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 th-;cast iron sets up electrolytic action. The fittings on iron presses, viz.: the outlet cocks for the. LARGE 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, however, 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 , e. g., with barytes. china clay. etc. These requirements may be met b\making the plates and frames of the press of an alloy or metalnot attacked by the acid, such as gun metal, phosphor bronzer aluminium, or else of wood. Gun metal presses, when they can be used, have the advan-tage of great strength and of being suitable for hot liquors,but their cost is very considerable. The frame work of thepress is always made of iron, with gun metal line
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectmetallu, bookyear1902
