| Popis: |
At present, the determination of SiO2 in slag must depend upon the method of evaporation to dryness with HCl, but in the case of slag which contains too much Cr, it takes a long time to filter, and it is difficult to obtain the total SiO2 by once or twice dehydration. But by evaporating after the addition of NH4Cl, the time of filtration could be reduced to 1, 10, and the total SiO2 could be obtained only by twice dehydration and thus the method of determination of Silica was simplified and made accurately. The mechanism of the addition of NH4Cl was discussed theoretically. |
