离子型稀土一维入渗规律及机理试验研究

发布时间：2018-02-06 05:03

本文关键词： 离子型稀土入渗湿润锋入渗率模型　出处：《江西理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：离子型稀土矿山开采方式多采用原地浸,相关理论研究多处于空白状态。在实际开采过程中,多凭经验确定注液井网参数和注液速度,造成资源浸取回收率不确定性非常大。究其原因,主要是对单井注液时交换液在稀土矿体中的浸润区域规律及其影响因素研究的缺失,特别是交换液在矿体中非饱和非稳定的入渗过程和机理研究不够。针对这一情况,本文从外在因素(入渗水)和内在因素(粒径组成)的角度对入渗特性进行了分析。首先介绍了非饱和土的概念及其入渗理论,分别阐述了Green-Ampt模型、Horton模型、Philip模型、Kostiakov模型的基本假设和使用条件。介绍了经典模型存在的问题,由于问题的存在,然后重点介绍了分层假定入渗模型的建立。最后通过试验结果验证了分层假定模型的适用性。本文研究了稀土粒径和交换液浓度两个因素对湿润锋运移速率、饱和渗透系数以及基质吸力的影响;根据室内试验结果,验证了离子型稀土入渗湿润锋倒数与入渗率之间存在线性关系;建立了分层假定入渗模型,并运用其结果分析了入渗时间和湿润锋运移速率的变化关系。研究表明,稀土土样粒径大小和交换液浓度对入渗规律都有明显的影响。
[Abstract]:Ion rare earth mining methods are mostly in situ leaching, and the related theoretical research is mostly blank. In the actual mining process, the parameters of injection well pattern and the injection velocity are mostly determined by experience. The uncertainty of recovery rate of resources leaching is very great. The main reason is the lack of study on the infiltrating region and influencing factors of exchange fluid in rare earth orebody during injection of single well. Especially, the process and mechanism of unsaturated and unsteady infiltration of exchangers in ore bodies are not studied enough. In this paper, the infiltration characteristics are analyzed from the external factors (infiltration) and internal factors (particle size composition). Firstly, the concept of unsaturated soil and its infiltration theory are introduced. Green-Ampt model and Horton model and Philip model are described respectively. The basic assumptions and application conditions of the Kostiakov model. The problems of the classical model are introduced, due to the existence of the problems. Finally, the applicability of the delamination model is verified by the experimental results. In this paper, two factors, the rare-earth particle size and the concentration of the exchange solution, on the wetting front migration rate are studied. The influence of saturation permeability coefficient and matrix suction; According to the results of laboratory tests, the linear relationship between the reciprocal of wetting front of ion rare earth infiltration and infiltration rate was verified. A stratified assumed infiltration model is established, and the relationship between infiltration time and wetting front migration rate is analyzed by using the results. The size of rare-earth sample and the concentration of exchange solution have obvious influence on infiltration law.
【学位授予单位】：江西理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD865

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