本文關(guān)鍵詞： 離子型稀土 入滲 濕潤(rùn)鋒 入滲率 模型　出處：《江西理工大學(xué)》2015年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：離子型稀土礦山開(kāi)采方式多采用原地浸,相關(guān)理論研究多處于空白狀態(tài)。在實(shí)際開(kāi)采過(guò)程中,多憑經(jīng)驗(yàn)確定注液井網(wǎng)參數(shù)和注液速度,造成資源浸取回收率不確定性非常大。究其原因,主要是對(duì)單井注液時(shí)交換液在稀土礦體中的浸潤(rùn)區(qū)域規(guī)律及其影響因素研究的缺失,特別是交換液在礦體中非飽和非穩(wěn)定的入滲過(guò)程和機(jī)理研究不夠。針對(duì)這一情況,本文從外在因素(入滲水)和內(nèi)在因素(粒徑組成)的角度對(duì)入滲特性進(jìn)行了分析。首先介紹了非飽和土的概念及其入滲理論,分別闡述了Green-Ampt模型、Horton模型、Philip模型、Kostiakov模型的基本假設(shè)和使用條件。介紹了經(jīng)典模型存在的問(wèn)題,由于問(wèn)題的存在,然后重點(diǎn)介紹了分層假定入滲模型的建立。最后通過(guò)試驗(yàn)結(jié)果驗(yàn)證了分層假定模型的適用性。本文研究了稀土粒徑和交換液濃度兩個(gè)因素對(duì)濕潤(rùn)鋒運(yùn)移速率、飽和滲透系數(shù)以及基質(zhì)吸力的影響;根據(jù)室內(nèi)試驗(yàn)結(jié)果,驗(yàn)證了離子型稀土入滲濕潤(rùn)鋒倒數(shù)與入滲率之間存在線(xiàn)性關(guān)系;建立了分層假定入滲模型,并運(yùn)用其結(jié)果分析了入滲時(shí)間和濕潤(rùn)鋒運(yùn)移速率的變化關(guān)系。研究表明,稀土土樣粒徑大小和交換液濃度對(duì)入滲規(guī)律都有明顯的影響。
[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.
【學(xué)位授予單位】：江西理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TD865

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