Method for monitoring in-situ leaching mining process of ion adsorption type rare earth mine

Abstract

The invention discloses an ion adsorption type rare earth mine in-situ leaching mining process monitoring method, which comprises the following steps: S1, according to mine geology and hydrogeology conditions, in combination with ore body and terrain distribution characteristics, laying a high-density electrical method measurement grid profile; s2, high-density electrical method measurement is carried out according to the laid measurement grid section, and a mine apparent resistivity cross-section diagram is obtained; s3, according to the resistivity cross-section diagram of each section, geological data correction and inversion are combined to obtain a geological model of each section, and a liquid injection and collection system is arranged according to the geological model of each section; s4, performing high-density electrical method measurement on each section according to a certain time interval after liquid injection, and obtaining an apparent resistivity cross-section diagram corresponding to each section at different time; and S5, inverting the permeation process of the mother liquor along with time according to the rule that the apparent resistivity of each section changes along with time, and correspondingly adjusting a liquid injection and collection system. The mining efficiency of mine in-situ ore leaching is improved, and potential safety hazards are reduced.

Description

technical field [0001] The invention relates to the fields of mining and geological monitoring, in particular to an ion adsorption type rare earth mine in-situ leaching and mining process monitoring method. Background technique [0002] Ion adsorption type rare earth ore refers to rare earth deposits in which rare earth elements are exchangeable and adsorbed cations in weathering crust. The ore-forming parent rock of such deposits is mainly granite. Because the relevant documents stipulate: "In-situ leaching and other production processes that are suitable for resources and environmental protection requirements should be used in the development of ionic rare earth ore, and the use of backward beneficiation processes such as heap leaching and pool leaching, which are prohibited by the state, should be used." Mining of the deposit is carried out using the in-situ leaching process. [0003] The so-called in-situ leaching process is to arrange liquid injection wells directly on...

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Problems solved by technology

[0004] However, the mining effect of in-situ leaching is mainly restricted by the geological conditions of the mine, and there are some unavoidable defects, such as: ① The application effect of complex geological types is not ideal. High amount, long mining cycle, low recovery rate of rare earth

② When encountering a rare earth mine without a natural floor, the leaching mother liquor will leak into the groundwater, which will greatly reduce the recovery rate of rare earth

③ The ionic rare earth rocks are strongly weathered, the soil structure is loose, and the slope of the local slope is relatively steep. Long-term liquid injection makes the mountain in a water-saturated state, and the compressive and shear strength of the soil decreases. Once heavy rainfall occurs, it is easy to induce mountain collapse. , landslides, and potential geological hazards

In other words, the current in-situ leaching mining has the following problems that need to be solved: ① Is there a comprehensive understanding of the mine's underground geological conditions, especially the underground hydrogeological conditions? Is the layout of the liquid injection system reasonable? ②Where does the mother liquor flow after injecting liquid into the injection well? Are there any seepage channels leading to loss of mother liquor? Are there natural barriers preventing mother liquor from collecting in the sump? ③Is the leaching liquid injected into the weathering crust saturated? When is it saturated? When should the infusion be stopped? Is there a safety hazard after saturation? Where is the hidden danger?

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