Abstract
Conditions for the hydrolysis of a titanium salt without adding alkaline reagents arise in the system (NH4)2TiF6-(NH4)2SiF6-NH4F-H2O. The hydrolysis is caused by a more alkaline pH of the (NH4)2SiF6 solution in the presence of NH4F as compared to the pH of the (NH4)2TiF6 hydrolysis beginning in a solution of NH4F of the same concentration. In the bottom phase isolated from the above system at 25°C, (NH4)2SiF6 is identified not in the cryptohalite form corresponding to the modification of the initial silicon salt, but in the bararite form. This transfer is caused by the isovalent isomorphous substitution of Si+4 ions for Ti+4 in the complex TiF62−.
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