裸脚式稀土矿山原地浸矿渗流过程及边坡变形

发布时间：2018-01-31 19:07

本文关键词： 稀土矿山原地浸矿渗流规律边坡变形注液强度　出处：《稀土》2017年03期 　论文类型：期刊论文

【摘要】：原地浸矿回收稀土资源时,因注液不当等原因,容易引发滑坡等地质灾害。选择陡坡开采矿块,现场实验研究裸脚式稀土矿山的原地浸矿渗流过程及其引起的边坡变形规律,得到如下结论。实验矿块的浸润面接近临界水位时,仍有26.5%的矿层处于非饱和状态,因而影响了离子交换效率和资源回收率,是造成"复灌"回收龙南类型离子型稀土资源的一个主要原因。实验矿块矿层饱和体积比为65.0%时,原地浸矿的渗流场进入平衡期,在平衡期之前,注液强度增加6天后裂缝宽度才有明显变化;进入平衡期之后,裂缝宽度变化滞后注液强度增加3天,滞后注液强度减小2天。对于坡度均一的陡坡,如果原地浸矿前期注液强度过大,易引发推移式滑坡,剪出口出现在半山腰以上,后期注液强度过大,易引发牵引式滑坡,剪出口出现在山脚下;对于上陡下缓的陡坡,原地浸矿易引发推移式滑坡。
[Abstract]:In situ leaching and recovery of rare earth resources, due to improper liquid injection and other reasons, it is easy to cause geological disasters such as landslides. The steep slope mining block is chosen. Field experiments were conducted to study the seepage process in situ leaching and slope deformation in bare foot rare earth mines. The conclusions are as follows: when the infiltrating surface of the experimental ore block is close to the critical water level. 26.5% of the ore beds are still in unsaturated state, which affects ion exchange efficiency and resource recovery. When the saturation volume ratio of ore bed of experimental ore block is 65.0, the seepage field of in-situ leaching is in equilibrium period, before the equilibrium period. The width of the fracture only changed obviously after the increase of the injection strength for 6 days. After entering the equilibrium period, the lag injection intensity increases by 3 days, and the lag injection intensity decreases by 2 days. For steep slopes with uniform slope, if the in-situ leaching early injection intensity is too large, it is easy to cause the bedded landslide. The clipping exit appears above the hillside, and the liquid injection intensity is too large in the later stage, which can easily lead to the traction type landslide, and the shear exit appears at the foot of the mountain. For steep steep slopes, in-situ leaching can easily lead to bedside landslides.
【作者单位】：江西理工大学工程研究院;江西理工大学建筑与测绘工程学院;中国科学院寒区旱区环境与工程研究所冻土工程国家重点实验室;
【基金】：国家自然科学基金资助项目(41602311;51264008) 江西省自然科学基金(20151BAB206023;20133ACB20003) 江西省教育厅科技落地计划项目(03904)
【分类号】：TD854.6;TD865
【正文快照】： 离子型稀土资源的开采经历了池浸工艺和堆浸工艺,目前,正在推广应用原地浸矿工艺[1]。原地浸矿开采离子型稀土资源的工艺是:采用洛阳铲在稀土矿块内按照一定的孔网参数钻注液孔,通过注液孔向矿体注入硫酸铵溶液,使其与稀土离子发生交换反应,稀土离子进入溶液中形成母液,母液在

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