Dissolution kinetics of iron sulfide minerals in alkaline solutions

IF 10.9 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Cement and Concrete Research Pub Date : 2025-03-11 DOI:10.1016/j.cemconres.2025.107850

Zhanzhao Li , Christopher A. Gorski , Aaron Thompson , Jeffrey R. Shallenberger , Gopakumar Kaladharan , Aleksandra Radlińska

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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 (13–14). 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.

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硫化铁矿物在碱性溶液中的溶解动力学

由硫化铁矿物，特别是磁黄铁矿和黄铁矿引起的有害聚集反应，已经破坏了全球许多地区的混凝土结构。虽然这些矿物质已经在酸性条件下进行了广泛的研究，但它们在碱性环境（如混凝土）中的行为仍然知之甚少。本研究探讨了高pH（13-14）下硫化铁溶解的动力学和机理。结果表明，磁黄铁矿的溶解速度比黄铁矿快几个数量级，溶解速度随pH和温度的增加而增加。溶液中碱（钾或钠）的类型对溶解行为没有影响。动力学模型和实验表征表明，磁黄铁矿的溶解动力学受化学反应（铁和硫的氧化）和扩散(通过Fe（III)-（氧）氢氧化物层）的共同控制。这些发现为控制混凝土中硫化铁的溶解和减轻硫化铁引起的损伤提供了实际的见解。

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来源期刊

Cement and Concrete Research 工程技术-材料科学：综合

CiteScore

20.90

自引率

12.30%

发文量

318

审稿时长

53 days

期刊介绍： Cement and Concrete Research is dedicated to publishing top-notch research on the materials science and engineering of cement, cement composites, mortars, concrete, and related materials incorporating cement or other mineral binders. The journal prioritizes reporting significant findings in research on the properties and performance of cementitious materials. It also covers novel experimental techniques, the latest analytical and modeling methods, examination and diagnosis of actual cement and concrete structures, and the exploration of potential improvements in materials.