Ammonia-free mining method for rare earth ore in south China

Abstract

Provided is an ammonia-free mining method for rare earth ore in south China. Magnesium ions and sodium ions are combined to serve as an ore leaching agent, and meanwhile magnesium salt serves as an enrichment agent. The ammonia-free mining method for rare earth ore in the south China includes the steps of leaching of rare earth ore, collection of rare earth mother liquor, pre-enrichment of rare earth, dissolution of rare earth hydroxide, rare earth sulfate double salt precipitation and rare earth sulfate double salt conversion. According to the ammonia-free mining method for rare earth ore in the south China, the ore leaching agent and precipitant which have no ammonia nitrogen and are relatively friendly to water are combined with the in-situ leaching mode, rare earth compounds meeting the use demands of a rare earth separation plant are generated through rare earth double salt precipitation, the production cost is low, and environmental pollution is greatly reduced.

Description

technical field [0001] The invention relates to an ammonia-free mining method of southern rare earth mines. Background technique [0002] The existing mining mode of southern weathering and leaching rare earth mines (hereinafter referred to as southern rare earth mines) uses ammonium sulfate as the leaching agent and ammonium bicarbonate as the precipitating agent. The engineering scheme of in-situ leaching is adopted, which plays an important role in soil erosion and vegetation protection. To great effect. The so-called in-situ leaching is not to excavate the original ore body as a whole, but to set up liquid injection wells with gaps so that the leaching agent can diffuse and infiltrate in the mountain body to perform ion exchange, and then set diversion holes and collect liquid through the bottom of the ore body. Ditch and other engineering facilities enable the leaching mother liquor to be collected, and the rare earth in it is recovered by precipitation, and the soluti...

AI Technical Summary

Problems solved by technology

The in-situ leaching method can better protect the ecological vegetation and reduce water and soil loss. It is a relatively friendly mining mode, but the part of the ammonium leaching agent and precipitant that is unorganized makes the ammonia nitrogen content in the water around the mine Too high, the water body is rich in nutrients