Method for leaching rare earth from weathering crust leaching type rare-earth ore heap

Abstract

The invention relates to a method for leaching rare earth from weathering crust leaching type rare-earth ore heap. The method comprises the following steps: (1) stripping humus layer ore soil of weathering crust leaching type rare-earth ore; (2) selecting the storage yard site; (3) constructing the storage yard, namely laying a leakproof layer on the compacted site, laying a wood frame, covering a linen piece, stacking a completely weathering layer and a half weathering layer on the site to form the storage yard, and finally flattening and topping; (4) performing heap leaching and extracting the rare earth, namely adding an ammonium salt ore leaching agent into the storage yard from the heap top by virtue of a liquid adding pipe, naturally downwards penetrating the ammonium salt ore leaching agent, collecting the rare-earth leaching mother solution from a confluence trench at the bottom of the storage yard, and precipitating and recycling the rare earth by using oxalic acid or ammonium bicarbonate; and (5) recovering the vegetation. The rare-earth leaching solution obtained by the method is small in amount of impurities, the rare-earth product is high in purity, the later-stage vegetation recovery is promoted, and high-efficiency and green mining can be realized.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy, and relates to a method for heap leaching and extracting rare earth from weathering crust leaching type rare earth ore. Background technique [0002] Weathering crust eluvial rare earth ores are widely distributed in seven provinces including Jiangxi, Guangdong, Fujian, Hunan, Yunnan, Guangxi and Zhejiang. Because they are rich in medium and heavy rare earths with high commercial value, the mining of this mine has always been popular. It has been highly valued at home and abroad and has been identified as a strategic mineral. The weathering crust leaching type rare earth ore is composed of rare earth-containing granite and volcanic rock, etc., in a warm and humid climate, through biological, chemical and physical effects, weathering forms kaolinite, halloysite, montmorillonite and illite, etc. Clay minerals, and the rare earth minerals that are easily weathered in the original rock are a...

AI Technical Summary

Problems solved by technology

However, the traditional heap leaching process usually blindly mixes the various layers of mine soil to build a stockpile, which easily leads to high impurity content in the rare earth leaching mother liquor, increased removal costs, low purity of rare earth products, and poor permeability of the stockpile. Poor, long production cycle

In addition, the polyethylene plastic film on the bottom of the storage yard can easily prevent the material exchange between the upper and lower soil layers, which is not conducive to vegetation restoration.

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