改进单毛细上升模型确定原地浸矿中的毛细损失高度  

Determination of Capillary Loss Height in In-Situ Leaching by Improving Single Capillary Rise Model

作　　者：肖莜丰 秦磊 王观石[1] 罗嗣海[1] 李琪 张超[1] Xiao Youfeng;Qin Lei;Wang Guanshi;Luo Sihai;Li Qi;Zhang Chao(College of Civil Engineering and Surveying,Jiangxi University of Science and Technology,Ganzhou 341000,China)

机构地区：[1]江西理工大学土木与测绘工程学院,江西赣州341000

出　　处：《稀有金属》2022年第2期215-226,共12页Chinese Journal of Rare Metals

基　　金：国家自然科学基金项目(51874147,51664015);国家重点研发计划项目(2019YFC0605001);江西省省级研究生创新专项资金项目(YC2019-S311)资助。

摘　　要：再吸附现象是离子型稀土原地浸矿中浸取率的主要影响因素之一,其可以分为随着液体渗流在矿体下部再吸附和因为毛细作用在矿体上不再吸附两个部分。矿体下部的再吸附已有很多的研究,主要通过浸矿剂用量的多少来解决,而针对毛细上升作用引起的上部再吸附研究相对较少。本文在已有单毛细上升模型的基础上,把土柱的等效孔径(R_(等))替换单毛细上升模型原本的孔径(R),让该模型可用于土壤多孔隙网络情况,对该模型进行修正。然后通过毛细上升实验,拟合R_(等)与孔隙比(e)、10%的细颗粒直径(D_(10))和浸矿剂浓度(C_(NS))的函数关系。然后考虑含水率(θ)对毛细上升高度的影响,得出修正计算公式。最终通过验证实验得出该修正模型计算值和真实值差值在6%以内,具有较高的准确性,能够符合回收上部毛细再吸附的高度计算需求。Rare earths are a kind of strategic resources worldwide,especially medium and heavy rare earth.Its output has an important influence on the development of military and industry.As the main source of medium and heavy rare earth in China,ionic rare earth ores are mainly mined by in-situ leaching process.However,in-situ leaching technology is often affected by many factors that lead to low mining efficiency,re-adsorption is one of the main factors affecting the leaching rate of ion-type rare earth in-situ leaching.The problem of re-adsorption can be divided into two parts:re-adsorption with liquid seepage in the lower part of the orebody and readsorption due to capillary action in the upper part of the orebody.There were many researches on the reabsorption of the lower part of ore body,that could be solved by adjusting the dosage of leaching agent,the concentration of leaching agent and the arrangement of injection hole.However,there were relatively few studies on the upper re-adsorption induced by capillary rise.According to the related research data,the re-adsorption caused by the capillary rise would cause the leaching rate to decline about 1%~2%,so the problem would lead to waste of rare earth resources.The re-adsorption problem caused by capillary rise was because of the upward migration of rare earth with liquid caused by soil capillarity.Therefores ore-leaching solution in the injection hole could not be contacted.It led to the non-recovery of rare earths in the upper region.Therefore,the problem could be solved by increasing the height of the liquid surface in the injection hole,so that the solution in the hole could be re-adsorbed through the capillary zone.The height of soil risen by capillary was affected by many factors,such as soil pore ratio(e),10%fine diameter(D_(10)),permeability coefficient(K),water content(θ),solution density(q),solution surface tension(σ)and solution concentration(C_(NS)),q andσcould be obtained simply and constant in solution,and K was related to e and D_(10),so that it could

关 键 词：再吸附 毛细上升高度 单毛细上升模型 浸矿剂浓度 等效孔径 孔隙比 10%细颗粒直径(D_(10)) 

分 类 号：TD865[矿业工程—金属矿开采]