PROCEDIMENTO PER CONVERTIRE IN SOLDI SILICE DELLA SILICE SUPERSATURA E PER SEPARARLA DALL ACQUA IN CUI E DISCIOLTA

A liq. contg. super saturated silica is mixed with silica seed. The resulting liq. in which the total content of silica is 0.05-5% is held at pH 6-10 and above 40 deg.C, to accelerate crystallisation of dissolved silica. The silica prod. is sepd. using an ultrafiltration membrane. The silica seed ma...

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Bibliographische Detailangaben
Hauptverfasser:	MICHIO KOMATSU HIROYASU NISHIDA, YOSHICHIKA TANAKA, MICHIYASU HAGIO, GORO SATO YUUSAKU ARIMA
Format:	Patent
Sprache:	ita
Schlagworte:	CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY CHEMISTRY COMPOUNDS THEREOF INORGANIC CHEMISTRY METALLURGY NON-METALLIC ELEMENTS PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL THEIR RELEVANT APPARATUS TRANSPORTING
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Beschreibung
Zusammenfassung:	A liq. contg. super saturated silica is mixed with silica seed. The resulting liq. in which the total content of silica is 0.05-5% is held at pH 6-10 and above 40 deg.C, to accelerate crystallisation of dissolved silica. The silica prod. is sepd. using an ultrafiltration membrane. The silica seed may be liq. alkali silicate or liq. prepd. by dealkalinating liq. alkali silicate with neutral or ion-exchange resin.