某金矿氟石膏基新型膏体充填材料配比试验研究

基于目前水泥胶凝材料价格大幅上调导致膏体充填成本高昂的实际境况，为降低充填成本，以工业废弃氟石膏为主要研究对象进行相关研究。利用氟石膏代替水泥，结合废石、粉煤灰、生石灰等掺加料，并辅以一定量的添加剂，开展氟石膏基新型膏体充填材料配比试验研究。通过坍落度、扩展度等试验确定材料的最优配比，并对膏体进行单、三轴及SEM试验，分析其宏微观结构。研究结果表明：质量浓度增大0min至120min，坍落度、扩展度损失率随之增大，泌水率却逐渐减小；最优配比所制成氟石膏基膏体的单轴压缩应力—应变曲线属于弹塑性曲线，最高可达6~7MPa；单轴与三轴压缩试验后，膏体表面未出现大的破裂面，且随围压的增加，应力—应变曲线不再出现峰值应力；所制充填材料的水化物主要包括钙矾石（AFt）、水化硅酸钙凝胶（C-S-H凝胶）和二水硫酸钙（CaSO4?2H2O）。氟石膏基新型膏体充填材料的配制具有深远的影响，为实现高效安全、绿色可持续的矿山开采提供了保障。

Study on the proportion of a new fluorgypsum-based paste filling materialin a gold mine

Based on the actual situation of high cost of paste filling due to the drastic price increase of cement gelatinous materials, to reduce the filling cost, relevant research was carried out with industrial waste fluorine anhydrite as the main research object. A new type of paste filling material was studied by using waste rock, fluorine anhydrite, fly ash and quick lime as admixtures and supplemented with certain amount of additives. The optimal mixture ratio of materials was determined by slump, expansion rate tests and the paste were subjected to uniaxial, triaxial and SEM tests to analyze its macro and micro structures. The results showed that the loss rate of slump and expansion increased with the increase of mass concentration from 0min to 120min, but the bleeding rate decreased gradually. The uniaxial compressive stress-strain curve of the fluorgypsum-based paste prepared by the optimal mixture ratio belonged to the elastic-plastic curve, which was up to 6~7MPa. After uniaxial and triaxial compression tests, no large rupture surface appeared on the surface of the paste, and the stress-strain curve on longer showed peak stress with the increase of the surrounding rock pressure. The hydrates of the filling materials mainly included ettringite (Aft), hydrated calcium silicate gel (C-S-H) and calcium sulfate dehydrate (CaSO4?2H2O). The preparation of fluorgypsum-based new paste filling materials had a far-reaching influence, which provided a guarantee for the realization of efficient, safe, green and sustainable mining.