原地浸矿单孔影响范围试验研究

发布时间：2018-06-28 18:29

  本文选题：原地浸矿 + 注液强度　； 参考：《江西理工大学》2017年硕士论文

【摘要】：目前,离子型稀土开采正在推广使用原地浸矿工艺,开采过程中基本达到了预期的经济效果,但由于各个矿区复杂多变的实际情况,且没有统一的规范,很多工艺都是凭借经验开采,开采过程中也出现了很多问题,如网孔布置不合理影响稀土的浸取率,导致二次复灌现象。故研究不同注液强度的单孔入渗试验以及原矿和尾矿品位的分布规律对规范注液工艺、减少资源浪费有着重要的意义。本文是针对在赣州市龙南县某离子型稀土矿区注液工艺调研时发现的一些问题进行的研究和分析,为此开展了三个现场试验,分析原地浸矿的单孔影响范围。第一个是单孔注液入渗试验,通过监测5种不同注液强度的注液孔周边含水率随时间的变化,得到注液第1-10天的饱和度云图,根据云图来分析单孔影响范围;第二个是单孔注液染色示踪试验,根据试验结果,提出建立单孔注液影响范围计算模型的基本假设,基于注液孔孔周入渗水量等于注液影响范围内含水量增量建立单孔影响范围计算模型;第三个是现场取样试验,通过在现场取一些不同位置的尾矿矿样进行配分测试分析,可了解注液孔网参数对原地浸矿的影响。通过以上研究分析,主要得出以下结论:(1)建立了单孔影响范围计算模型,得出5种不同注液强度稳态时的计算值,与现场试验值比较,最大误差为16.7%,满足工程要求,且随着注液强度的增大,误差减小。(2)注液孔周围体积含水率的非均匀性非常显著,单孔注液强度与孔中液面高度成非线性关系,单孔影响范围与注液时间呈指数关系,高饱和度大于90%的影响范围随时间变化缓慢,在注液的前4天,饱和度小于80%的影响范围随时间变化非常快,并渐趋稳定;单孔注液入渗过程在第10天达到稳渗状态。(3)原矿品位沿深度方向近似成“P”字形,即表层矿体品位高,最高达到1‰,随深度增加,品位快速减小,并渐趋稳定。地表坡度对浸取率有一定的影响,采用相同的注液孔网参数,坡度增加,浸取率有所降低。(4)随着与注液孔的距离增加,稀土品位增加,资源浸取率降低,当注液孔间距超过4.0m,随深度增加,矿样品位高且波动较大,资源浸取率低;当注液孔间距不超过3.0m,随深度增加,矿样品位快速减小,当深度大于2.0m,矿样品位渐趋稳定;对于龙南类型稀土矿体,注液孔间距不应超过3.0m。(5)浸矿过程轻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，

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