System and method for in-situ ore leaching of southern ionic rare earth

Abstract

The invention relates to an in-situ ore leaching mining technology, in particular to a system and a method for in-situ ore leaching of southern ionic rare earth. According to the system and the method, continuous waterproof curtains are formed on the periphery and the bottom of an ore body through a high-pressure jet grouting construction technology, the area formed by the waterproof curtains serves as an ore leaching area, ore leaching liquid can be prevented from flowing out of the ore body, and the problem that surface water and underground water are seriously polluted due to the fact that the ore leaching liquid leaks along rock and ore body cracks is effectively solved. A drilling machine is used for drilling a horizontal hole and inserting a liquid collecting pipe to replace manual excavation of a liquid collecting roadway, the rare earth mining safety can be improved, waste soil discharge is reduced, a dredger is installed in the liquid collecting pipe, the liquid collecting pipe is prevented from being blocked, and the liquid collecting efficiency is improved.

Description

technical field [0001] The invention relates to in-situ leaching mining technology, in particular to a system and method for in-situ leaching of southern ionic rare earths. Background technique [0002] Rare earth is a general term for 17 rare elements including lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, yttrium and scandium. my country's rare earth mines are divided into two types: heavy rare earths and light rare earths. The heavy rare earths are mainly southern ionic rare earths, and the light rare earths are mainly northern rare earths. Southern ionic rare earth ores are rich in medium and heavy rare earth elements such as yttrium, dysprosium, and terbium, and have become important basic materials for modern high-tech and cutting-edge fields such as national defense. They are my country's advantageous mineral resources and strategic resources. [0003] The ty...

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Problems solved by technology

[0009] (2) The leakage of ore leaching solution is large, and there are blind spots in ore leaching; the use of sites is limited, which affects the efficiency of ore leaching

If the rare earth mine does not have a complete bedrock floor or the bedrock floor is buried too deep, the use of in-situ leaching technology is limited or unavailable. If the pool leaching process or heap leaching process is used, it will cause environmental damage and is not allowed to be used at present. Pool leaching or heap leaching process, so this type of southern ion-type rare earth ores cannot be mined, making the precious ion-type resources unable to be developed and utilized

[0011] Judging from decades of in-situ leaching mine mining practice, no matter whether the rare earth mine has a complete bedrock floor or not, there is always the problem of leaching liquid leakage. Go underground or be taken out by mining "top water" or rainwater leaching, resulting in waste of leaching solution

[0012] During the leaching process, in order to fully extract the rare earth ore, it is generally necessary to increase the liquid injection volume and continuously inject the liquid, but if the liquid injection volume is too large, it will easily cause landslides, and if the liquid injection volume is insufficient, it is inevitable that a large amount of leaching liquid cannot reach the leaching site Blind area of ​​the mine, so some rare earth ores cannot be leached, resulting in a waste of precious rare earth resources

[0013] (3) Manually excavated liquid injection wells are prone to leaching blind spots, reducing leaching efficiency

[0014] The current leaching shafts are shallow vertical shafts excavated manually with Luoyang shovels. Although the liquid injection wells are densely distributed on the mine when the rare earth mines are mined, the distance between them is generally 1.5 meters to 3 meters, but the liquid injection wells are arranged vertically. Therefore, it is difficult for the leaching solution to penetrate into all rare earth-containing ore bodies in the mine, which reduces the leaching efficiency and forms leaching blind spots. The rare earth ore cannot be leached, and it is a waste of rare earth resources.

[0015] (4) Manual excavation of the liquid collection roadway or drilling to install the liquid collection pipe, the liquid collection is not complete

[0016] The rare earth ore is collected by manual excavation of the liquid collection roadway. Due to the sealing problem of the cracks in the rare earth min

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