EXPERIMENTAL DETERMINATION OF THE KINETIC EXPRESSION FOR THE DISSOLUTION OF K-SLAG, A TRICALCIUM SILICATE, IN ACIDIC AQUEOUS SOLUTION AT 25°C AND IN EQUILIBRIUM WITH AIR, USING THE RESULTS OF PH-STAT EXPERIMENTS;
Based on experimental studies in a pH-stat the dissolution kinetics for K-slag, a tricalcium silicate, was determined. The expression is:
[CHEMICAL FORMULA NOT INCLUDED] where the rate constants at 20°C are given by: pKi =5.36±0.18, pKW=8.15±0.08 and pKB= 7.3 ±0.06. The dissolution of K-slag is slower than calcite dissolution but faster than dolomite dissolution at pH-values below pH 5. At pH-values above pH 6 the dissolution rate is slightly faster than calcite.