Surface evolution of aluminosilicate glass fibers during dissolution: Influence of pH, solid-to-solution ratio and organic treatment

Dissolution-precipitation reactions of silicate mineral fibers at alkaline pH

“…This may be the reason for the Al leaching observed in the initial stages of dissolution of the mineral wools with 1 M of NaOH. This kind of leaching of Ca, Mg, Al ions were also observed in other dissolution studies [50,51] and stone wool dissolution studies at pH 11-13 conditions [13].…”

“…Dissolved species play a key role in the strength development and structural morphology of the final cementitious binder [6][7][8][9]. So far, dissolution studies of mineral wools have been only carried out in acidic and near-neutral conditions to reflect their ability to dissolve in lungs [10][11][12] and one on dissolution of stone wool at alkaline condition [13]. The main objective of the current study was to investigate and understand the dissolution kinetics and type of precipitation products of both type of mineral wools (Sw & Gw) at (a) both low and high alkaline pH, depicting the pH of Na 2 CO 3 and NaOH solutions, and (b) liquid-to-solid ratio (L/S) conditions, depicting far (L/S 1000) and near equilibrium (L/S 50).…”

Surface Layer Alteration of Multi-Oxide Silicate Glasses at a Near-Neutral pH in the Presence of Citric and Tartaric Acid

“…The attack leads to the formation of surface complexes that mediate the detachment of cations. The overall dissolution rate will slow down or stop completely once the surface layer attains equilibrium with the solution, i.e., when the chemical affinity for the surface layer dissolution reaction approaches zero; at near-neutral pH, particular importance is related surface-adsorbed Al . However, also other anions, such as organic ligands, could form surface complexes.…”

“…The overall dissolution rate will slow down or stop completely once the surface layer attains equilibrium with the solution, i.e., when the chemical affinity for the surface layer dissolution reaction approaches zero; 18 at near-neutral pH, particular importance is related surfaceadsorbed Al. 19 However, also other anions, such as organic ligands, could form surface complexes. The hypothesis is that ligands could participate in the dissolution reaction in two ways: forming a surface complex that can enhance or inhibit cation release and/or forming aqueous complexes that contribute to increase the total concentrations of metals in solution by reducing the cation activity (e.g., Al 3+ , Fe 2+/3+ , Ca 2+ , Mg 2+ ), consequently lowering the ion activity product (IAP) of the precipitating phases and the adsorption of ions on the silicate surface.…”