Ion-adsorption-type rare earth in-situ leaching method and leaching system thereof

Abstract

The invention belongs to the technology of in-situ leaching mining, and particularly relates to an ion-adsorption-type rare earth in-situ leaching method and a leaching system thereof. A non-excavation directional drilling machine is used for carrying out mechanical drilling of injection wells and liquid-collecting roadways instead of using manual excavation, The quantity of the injection wells is decreased, the injection wells are changed into curved pipes and are buried in a mine body. Therefore, the phenomenon that rainwater infiltrates into channels is reduced, a landslide triggered by the in-situ leaching is prevented, the construction is simple, the construction cycle is short, the cost is low, the safety performance is improved, the waste earth discharge is reduced, and the ecological environment is protected.

Description

technical field [0001] The invention belongs to in-situ leaching mining technology, in particular to an ion-adsorption type rare earth in-situ leaching method and an ore leaching system. Background technique [0002] China's rare earths account for 80% of the world's proven rare earth reserves, and are my country's dominant mineral resources and strategic resources. The south is dominated by heavy rare earths, and the north is dominated by light rare earths. Among them, the southern ion-type adsorption rare earth deposits are of the "weathered crust type", rich in medium and heavy rare earth elements such as yttrium, dysprosium, and terbium, which are necessary for modern high-tech and cutting-edge fields such as national defense. [0003] Weathering crust leaching rare earth deposits are mainly distributed in six provinces and regions in southern my country, including Jiangxi, Fujian, Hunan, Guangdong, Guangxi and Yunnan. The position is generally higher, the weathering of...

AI Technical Summary

Problems solved by technology

Its shortcoming is that there are too many injection wells, which are easy to become rainwater infiltration channels and induce landslide disasters

[0007] (1) Manually excavated liquid injection wells (shafts) become rainwater channels, which can easily cause landslides in rare earth mines

[0008] In situ leaching, a large number of liquid injection wells need to be manually excavated with Luoyang shovels. The liquid injection wells all over the mountain are not only channels for liquid injection, but also channels for rainwater. A large amount of leaching liquid and rainwater are injected into the ground through the injection wells The long-term immersion and erosion of the ore layer and the leaching solution on the ore body, while the original rock of the ionic rare earth ore is mainly ore-bearing granite, the shape of the original ore is soil-like, and the strength is low. The state of stress balance causes damage, and the formation disturbance is obvious, which has a great impact on the slope stability and the physical and mechanical properties of the soil. If the ore body leaching cycle is long, the rainwater and leaching liquid seeping from the liquid injection shaft will make the ore body heavier. Increasing the downward sliding force will cause cracks of different sizes to appear on the hillside, and even cause the liquid injection well to collapse and induce landslides. Stope landslide accidents often occur in the process of in-situ leaching and mining, causing serious damage to the lives and properties of the people. Serious harm, and also seriously affect the economic and environmental benefits of extracting rare earths by in-situ leaching

[0009] (2) The construction efficiency of manual excavation of liquid injection wells is low, and the manual control of the well depth also reduces the leaching efficiency

In actual construction, due to the limited excavation depth of the Luoyang shovel, taking southern Jiangxi as an example, the depth of excavation with the Luoyang shovel in most cases does not exceed 5 meters, which may cause the injection well to not enter the fully weathered layer, but Located in the humus layer with poor permeability and low rare earth content, so that part of the injected liquid does not enter the fully weathered layer, resulting in waste of injected liquid and reduced leaching efficiency

[0012] (3) The cost of manual excavation of the liquid collection roadway is high and there are potential safety hazards

Manual excavation of the liquid collection roadway has a long construction period, high cost, and a lot of muck discharge. At the same time, there are safety hazards such as roof collapse and chipping

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