Abstract The production of alkali-activated materials and geopolymers from the finer fraction of tailings is being increasingly investigated, as they could be used for building and public works, or to retain heavy metals in a consolidated solid matrix. The present study proposes a Pitzer-based geochemical model to reproduce the alkaline leaching for two mine tailing samples and the polymerization reactions. The model fits the results of the leaching tests quite well over the reaction duration and up to NaOH 10 M and 60 °C. Discrepancy for the dissolved Mg concentration indicates that the database can handle ionic strength up to 5 mol.kg−1. A geopolymer solid solution was developed for setting reactions modeling. The results compare favorably with compressive strength tests results, with C-S-H, M-S-H and geopolymers as the main hydration products. The study proposes an innovative application of Pitzer database developments with application to the mining industry.

中文翻译：

---

尾矿水化建模：用碱活化材料生产水硬性粘合剂

摘要 越来越多地研究从尾矿的细碎部分生产碱活化材料和地质聚合物，因为它们可用于建筑和公共工程，或将重金属保留在固结固体基质中。本研究提出了一种基于 Pitzer 的地球化学模型来重现两个尾矿样品的碱浸和聚合反应。该模型非常适合在反应持续时间和高达 10 M NaOH 和 60 °C 的浸出测试结果。溶解镁浓度的差异表明该数据库可以处理高达 5 mol.kg-1 的离子强度。开发了一种地质聚合物固溶体，用于设置反应建模。结果与抗压强度测试结果相比具有优势，其中 CSH、MSH 和地质聚合物是主要的水化产物。