化学置换过程中稀土矿强度特性演化规律试验研究  

Experimental study on the evolution law of the strength characteristics of REO in displacement reaction

作　　者：王晓军[1] 卓毓龙 邓书强 廖声银[1] 李永欣[1] 

机构地区：[1]江西理工大学矿业工程重点实验室,江西赣州341000

出　　处：《江西理工大学学报》2016年第3期56-60,共5页Journal of Jiangxi University of Science and Technology

基　　金：国家自然科学基金资助项目(51364011;51564012);江西省研究生创新基金(YC2015-S294)

摘　　要：稀土矿体强度变化规律是决定其原地浸矿中安全高效回采的一个重要指标.为找到化学置换过程中稀土矿强度演化规律,进行室内模拟浸矿试验并每隔4 h随机选取8个(A、B两组各4个)重塑土样进行三轴压缩试验,根据试验测得的数据采用绘制莫尔圆的方法得到不同浸矿时长不同组别的重塑土样的黏聚力C、内摩擦角φ值.对比分析两组浸矿液强度指标随离子浓度变化,发现化学置换反应越剧烈,离子浓度跌落的也越快,相应的强度指标值也弱化的愈发明显.综合分析得到,离子型稀土矿山在用浓度为2%硫酸铵溶液浸矿时,在注液早期的24 h内需要加大对山体的监测,防止因黏聚力C和内摩擦角φ的改变导致山体滑坡.The change rule of ore strength is an important indicator to decide safe and efficient mining in the in-situ leaching. To obtain this rule, eight random selected remolded samples are taken in triaxial compression test every four hours in the laboratory simulation. The test data is used to obtain the cohesive stress and internal friction angle of different samples by drawing Mohr＇s circle. Contrastive analysis of two groups of ore solution intensity shows that the strength parameter changes following the solubility, and discovers that the more acute the displacement reaction is, the faster the ion-concentration reduces and strength parameter weakens. Comprehensive analysis shows when the ion-rare earth ore uses 2 % ammonium sulfate leaching, it must reinforce the mountain monitor intraday to prevent landslide from the change of cohesive stress and internal friction angle.

关 键 词：化学置换 稀土矿 黏聚力 内摩擦角 

分 类 号：TD865[矿业工程—金属矿开采]