In this study, the stage subsequent to filling mining is selected as the background, and the cemented tailings backfill serves as the research object. Given the effects of the layer effect, top load, lateral pressure coefficient, and so forth, a safety factor calculation model of cemented tailings backfill in large depth–width ratio stopes is developed in accordance with the Mohr–Coulomb failure criterion, which is compared with the models proposed by other scholars. Lastly, the characteristics of the effect exerted by a wide variety of factors are discussed. As indicated by the results, (1) there are three scenarios in the position of the sliding surface, located in the first layer, passing through two layers and passing through three layers, and mainly the first two. Compared with other models, the rationality and reliability of the model in this study are verified. Different models have different research backgrounds and different focuses, and certain differences exist in results. (2) The safety factor of cemented tailings backfills is reduced with the increase of the top load, the lateral pressure coefficient, and the bulk density, while it is increased with the increase of cohesion, internal friction angle, and bonding force ratio. Furthermore, a linear functional relationship exists between them. The safety factor has the maximum sensitivity to cohesion and the minimum sensitivity to top load. (3) Using Statistical Package for the Social Sciences (SPSS) software for regression analysis, a simplified multiple linear regression equation between the safety factor and the respective factor is built. The regression results achieve an error of 10%. As revealed by the result of this study, the simplified regression equation can be applied to the stability evaluation of the on-site cemented tailings backfill.
腰站林场地区位于大兴安岭北部漠河盆地北端,成矿地质条件优越.为实现找矿突破,在1:5万水系沉积物测量成果基础上,开展了1:1万土壤地球化学测量.结果表明:腰站林场地区Au元素丰度高,变异系数大,为主成矿元素,As、Sb元素可作为指示元素,以中低温热液成矿作用为主,找寻金矿床潜力较大;综合异常元素多、规模大、强度高.在部分综合异常区地表槽探查证中发现2条矿化体,矿化特征与宝兴沟金矿床具有一定的类似性,认为该地区具有良好的找矿前景.
针对黄铁矿氧化机理的研究较多,但尚未有学者对黄铁矿在酸性Ni2+溶液中的氧化行为进行研究.利用开路电位测量、线性伏安扫描及电化学阻抗谱等各种电化学测试技术,探讨了黄铁矿在酸性Ni2+溶液中的电化学氧化行为.试验结果表明:黄铁矿电极的开路电位随Ni2+浓度的增大而减小,腐蚀电流密度随Ni2+浓度的升高而增大,黄铁矿电极表面氧化速率随Ni2+浓度的增大而加快.
为了研究碳质金矿真空焙烧预处理过程中反应动力学规律,利用阿伦尼乌斯方程计算了碳质金矿真空焙烧过程的活化能和指前因子,并明确了不同阶段的反应动力学模型.试验结果表明:在碳质金矿真空焙烧过程中,温度是控制反应速率的关键因素.温度越高,矿石质量损失率越大.焙烧过程分为0～60 min和60～120 min 2 个阶段,分别受界面化学反应控制和扩散控制.第二阶段的表观反应活化能显著低于第一阶段,这表明焙烧过程的热分解反应和质量损失主要发生于第二阶段.
某矿山采用细粒级尾矿进行充填,充填料浆浓度不稳定,易出现堵管或爆管事件,严重影响井下生产接续.开展了细粒级尾矿和胶结料浆的坍落度、扩展度、黏度及屈服应力试验.结合对采场充填基础参数分析与计算,可知管道阻力小于自然压头时即能实现自流输送.在确定胶结料浆浓度、流量、管径时,通过计算调整充填倍线实现自流输送,为现场充填自流输送提供了重要的理论依据.
