Active extraction method for ion type rare earth ore in-situ leaching

Abstract

The invention discloses an active extraction method for ion type rare earth ore in-situ leaching. According to the mine lot terrain, the hydrology geology, the fracture development part, the ore bodyspace position and other situations, one or more composite schemes in three well array arranging schemes are adopted for conducting active extraction; a row of horizontal vacuum wells are arranged atthe trough slope toe position, and a closed loop is adopted along the mountain body; light vacuum well points are arranged in the area where the upper covered soil and ore body depth is not larger than 6 m; vacuum deep wells are arranged at certain intervals in the mine lot along the trough position, the trough serves as a liquid accumulating groove, and an extraction curtain is formed through thevacuum deep wells at the seepage downstream position; according to the stratum situation, the reasonable hole forming manner is adopted, the drilling hole diameter is 90-300 mm, and the drilling vertical depth is not larger than 8 m; and drilling is conducted at the trough slope toe position or the special terrain position, the following pipe diameter is 108 mm-219 mm, the hole forming hole diameter is 90-300 mm, a water filter pipe is immediately lowered after drilling is finished, and then a casing pipe is pulled out. The active extraction method has the advantages that the active extraction manner is adopted, and the mother liquor recovery ratio is improved.

Description

technical field [0001] The invention relates to the field of rare earth mining, in particular to an active extraction method for in-situ leaching of ionic rare earth ores. Background technique [0002] At present, the main rare earth producing areas in my country are southern Jiangxi and central Inner Mongolia, and southern Jiangxi and Gannan are ionic heavy rare earths. Ionic rare earth ore mainly adopts ammonium sulfate in-situ leaching process. The main process is: in-situ injection of mother liquor → artificial floor effusion (artificial floor adopts roadway combined with drilling, and the lower part of the roadway and the lower part of the drill hole are cemented to prevent seepage) → Mother liquor treatment. The roadway is excavated manually, and the construction elevation of the roadway is the junction of the bottom of the ore body and the micro-weathered layer. The permeable holes are constructed in the roadway. Generally, the permeable holes are arranged in two row...

AI Technical Summary

Problems solved by technology

The existing problems are as follows: liquid accumulation roadways are mostly arranged in lean ore layers, sandy soil surrounding rocks, large safety risks during excavation of liquid accumulation roadways, high investment costs, long construction period, limited penetration hole depth and control range

The layout spacing and quantity of liquid-filled roadways are affected by the geological conditions of the mining area, and liquid-filled roadways cannot be arranged in areas with poor surrounding rocks, so the mining area of ​​liquid-filled roadways cannot completely cover the mining area

This method utilizes the gravity gradient seepage of the extract to the recovery hole (well), the recovery rate is low, and the rest of the extract enters the formation and groundwater after seepage, causing environmental pollution

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