METHOD OF SYNTHESIZING ZINCOSILICATE OR STANNOSILICATE OR TITANOSILICATE MATERIAL

摘要

METHOD OF SYNTHESISING ZINCOSILICATE OR STANNOSILICATE OR TITANOSILICATE MATERIAL Sodium zinco/stanno/titano-silicate is synthesised by mixing a concentrated aqueous sodium zincate (stannate, titanate) solution with a source of silica (e.g. powdered glass or sodium metasilicate solution) in the ratio 60g sodium silicate to sodium zincate equivalent to 8.lg zinc oxide, keeping the temperature at 40.degree.C for 1/2 hour, diluting threefold with water of 20.degree.C, allowinga precipitate to form overnight, and filtering and drying the residue at 110.degree.C. The resulting sodium zincosilicate may be used in its own right as a water softener or may be converted by cation exchange into any other desired zincosilicate.