Specific Features of the Formation of a Porous Structure in Products of Leaching of Two-Phase Sodium Borosilicate Glasses in Acid-Salt Solutions

摘要

This paper reports on the results of an investigation into the influence of the addition of a KC1 salt to an HC1 acid solution on the leaching kinetics of two-phase sodium borosilicate glasses and on the structural parameters of the leaching products (porous glasses). The contributions from different molecular species of silica to its total amount in leaching solutions are evaluated using the kinetic spectrophotometric technique for determining silicon in the form of beta-silicomolybdic heteropoly acid. It is revealed that the addition of the salt to the leaching acid solution leads to a fast polymerization process with the formation of weakly structurized silica gel.