The present market of sodium metasilicate pentahydrate was outlined, and then the experimental technique of preparing sodium metasilicate pentahydrate from the waste silica gel was introduced. The best crystallized conditions were obtained through experiments as follow: modulus 0.5 ～0.8, Beaume degree 35 ～50° , temperature for heating waste silica gel and condensed crystilization 90～100℃, boiling time 5 min and natural cooling for 10 h. Under the best conditions, the good crystal was given in which Na2O and...
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