本文選題：原地浸礦 + 注液強(qiáng)度��； 參考：《江西理工大學(xué)》2017年碩士論文

【摘要】：目前,離子型稀土開采正在推廣使用原地浸礦工藝,開采過程中基本達(dá)到了預(yù)期的經(jīng)濟(jì)效果,但由于各個礦區(qū)復(fù)雜多變的實際情況,且沒有統(tǒng)一的規(guī)范,很多工藝都是憑借經(jīng)驗開采,開采過程中也出現(xiàn)了很多問題,如網(wǎng)孔布置不合理影響稀土的浸取率,導(dǎo)致二次復(fù)灌現(xiàn)象。故研究不同注液強(qiáng)度的單孔入滲試驗以及原礦和尾礦品位的分布規(guī)律對規(guī)范注液工藝、減少資源浪費有著重要的意義。本文是針對在贛州市龍南縣某離子型稀土礦區(qū)注液工藝調(diào)研時發(fā)現(xiàn)的一些問題進(jìn)行的研究和分析,為此開展了三個現(xiàn)場試驗,分析原地浸礦的單孔影響范圍。第一個是單孔注液入滲試驗,通過監(jiān)測5種不同注液強(qiáng)度的注液孔周邊含水率隨時間的變化,得到注液第1-10天的飽和度云圖,根據(jù)云圖來分析單孔影響范圍;第二個是單孔注液染色示蹤試驗,根據(jù)試驗結(jié)果,提出建立單孔注液影響范圍計算模型的基本假設(shè),基于注液孔孔周入滲水量等于注液影響范圍內(nèi)含水量增量建立單孔影響范圍計算模型;第三個是現(xiàn)場取樣試驗,通過在現(xiàn)場取一些不同位置的尾礦礦樣進(jìn)行配分測試分析,可了解注液孔網(wǎng)參數(shù)對原地浸礦的影響。通過以上研究分析,主要得出以下結(jié)論:(1)建立了單孔影響范圍計算模型,得出5種不同注液強(qiáng)度穩(wěn)態(tài)時的計算值,與現(xiàn)場試驗值比較,最大誤差為16.7%,滿足工程要求,且隨著注液強(qiáng)度的增大,誤差減小。(2)注液孔周圍體積含水率的非均勻性非常顯著,單孔注液強(qiáng)度與孔中液面高度成非線性關(guān)系,單孔影響范圍與注液時間呈指數(shù)關(guān)系,高飽和度大于90%的影響范圍隨時間變化緩慢,在注液的前4天,飽和度小于80%的影響范圍隨時間變化非常快,并漸趨穩(wěn)定;單孔注液入滲過程在第10天達(dá)到穩(wěn)滲狀態(tài)。(3)原礦品位沿深度方向近似成“P”字形,即表層礦體品位高,最高達(dá)到1‰,隨深度增加,品位快速減小,并漸趨穩(wěn)定。地表坡度對浸取率有一定的影響,采用相同的注液孔網(wǎng)參數(shù),坡度增加,浸取率有所降低。(4)隨著與注液孔的距離增加,稀土品位增加,資源浸取率降低,當(dāng)注液孔間距超過4.0m,隨深度增加,礦樣品位高且波動較大,資源浸取率低;當(dāng)注液孔間距不超過3.0m,隨深度增加,礦樣品位快速減小,當(dāng)深度大于2.0m,礦樣品位漸趨穩(wěn)定;對于龍南類型稀土礦體,注液孔間距不應(yīng)超過3.0m。(5)浸礦過程輕稀土元素的浸取率低于稀土元素的平均浸取率,而中重稀土元素的浸取率高于稀土元素的平均浸取率。
[Abstract]:At present, ion rare earth mining is popularizing the in-situ leaching process, and the expected economic effect is basically achieved in the mining process. However, due to the complicated and changeable actual situation in each mining area, and there is no unified standard, Many of the techniques are mined by experience, and many problems appear in the mining process, for example, the unreasonable arrangement of mesh affects the leaching rate of rare earth, which leads to the secondary recharge. Therefore, it is of great significance to study the single hole infiltration test with different injection intensity and the distribution law of the grade of raw ore and tailings in order to standardize the injection process and reduce the waste of resources. This paper is aimed at the research and analysis of some problems found in the investigation of liquid injection process in an ionic rare earth mining area in Longnan County of Ganzhou City. For this reason, three field tests have been carried out to analyze the influence range of single hole in situ leaching. The first is the experiment of single hole injection infiltration. By monitoring the change of water content around the injection hole of five different injection intensity with time, the saturation cloud map of 1-10 days is obtained, and the influence range of single hole is analyzed according to the cloud diagram. The second is the single hole injection dyeing tracer test. Based on the test results, the basic hypothesis of establishing a model for calculating the influence range of single hole injection is put forward. The calculation model of the influence range of single hole is established based on the increment of water content in the influence range of the water content around the hole. The third is the field sampling test, through taking some tailings samples from different positions in the field to carry out the distribution test and analysis. The effect of pore network parameters on in-situ leaching can be understood. Through the above research and analysis, the main conclusions are as follows: (1) the calculation model of the influence range of single hole is established, and the calculated values of five different injection strength steady state are obtained. Compared with the field test value, the maximum error is 16.7g, which meets the engineering requirements. With the increase of the injection intensity, the error decreases. (2) the inhomogeneity of the volume water content around the injection hole is very significant. The single hole injection intensity has a nonlinear relationship with the height of the liquid level in the hole, and the influence range of the single hole is exponentially related to the injection time. The influence range of high saturation more than 90% changes slowly with time, and the influence range of saturation less than 80% changes very quickly with time four days before liquid injection, and gradually becomes stable. (3) the ore grade is approximately "P" shape along the depth direction, that is, the surface ore body has a high grade, up to 1 鈥，

本文編號：2078938