# Dissolution kinetics of iron sulfide minerals in alkaline solutions Source: [Dissolution kinetics of iron sulfide minerals in alkaline solutions]() Collection index: [llms.txt]() Data updated: 2025-10-25T07:23:41.571Z Authors: Zhanzhao Li, Christopher A. Gorski, Aaron Thompson, Jeffrey R. Shallenberger, Gopakumar Kaladharan, Aleksandra Radli\\'nska Published: 2025-03-11T17:03:46.000Z ## Abstract Deleterious aggregate reactions induced by iron sulfide minerals, especially pyrrhotite and pyrite, have devastated concrete structures across many global regions. While these minerals have been extensively studied under acidic conditions, their behavior in alkaline environments, such as concrete, remains poorly understood. This study investigates the kinetics and mechanisms of iron sulfide dissolution at high pH (13$\\unicode{x2013}$14). Results revealed that pyrrhotite dissolves orders of magnitude more rapidly than pyrite, with dissolution rates increasing with both pH and temperature. The type of alkali (potassium or sodium) in the solution was not found to affect the dissolution behavior. Kinetic modeling and experimental characterization indicated that the dissolution kinetics of pyrrhotite is controlled by a combination of chemical reactions (oxidation of iron and sulfur species) and diffusion (through an Fe(III)-(oxy)hydroxide layer). These findings provide practical insights into controlling dissolution and mitigating iron sulfide-induced damage in concrete. ## Recorded benchmark results A research result applies to its stated dataset, split, metric and evaluation configuration. Compare like-for-like settings, preserve the metric's unit and direction, and distinguish paper-reported results from independent reproduction. The best result recorded here is not a claim of exhaustive, current global coverage. ## Original sources and implementation [Original paper]() [PDF]()