Southern ionic type rare earth mine ammonia-free mining process

Abstract

The invention provides a southern ionic type rare earth mine ammonia-free mining process. On the basis of the in-situ ore leaching technology, magnesium sulfate plus sodium sulfate is served as an ore leaching agent, sand sodium bicarbonate is served as a precipitating agent to produce rare earth carbonate, or an extraction manner is adopted to produce qualified high-concentration rare earth material liquid to be served as a product. The process comprises the steps that the ore leaching agent performs percolation and leaching on rare earth, a rare earth mother solution is collected, magnesium oxide enriches rare earth, sulfuric acid dissolves rear earth enriched products, impurities of the rare earth enriched products are removed in the same slot, and the sodium bicarbonate precipitates or extracts the rare earth. By means of the process, influences of ammonia nitrogen on the environment are avoided radically, the rare earth enriched products are precipitated rapidly through characteristics of magnesium oxide, the precipitate is small in size, and time of the whole process is greatly shortened.

Description

technical field [0001] The invention relates to a rare earth ore mining process, in particular to an ammonia-free mining process for an ion-type rare earth ore in southern China. Background technique [0002] The current mining process of southern ion-type rare earth mines is to use ammonium sulfate as the leaching agent and ammonium bicarbonate as the [A1] precipitant. Clarify and stand still, release the supernatant and then precipitate with ammonium bicarbonate, then stand for clarification and aging to produce carbonate rare earths, and the supernatant can be recycled as a leaching agent after returning to acid adjustment. [A2] The method of in-situ leaching of ore has well protected the mountain vegetation and avoided soil erosion; however, there are disadvantages such as complicated process operation, long process time, large loss of rare earth recovery and unstable product quality. Disorganized penetration of mineral agents [A3] The groundwater and surface water arou...

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Problems solved by technology

[A2] The method of in-situ leaching of ore has well protected the mountain vegetation and avoided soil erosion; however, there are disadvantages such as complicated process operation, long process time, large loss of rare earth recovery and unstable product quality. Disorganized penetration of mineral agents [A3] The groundwater and surface water around the mining area have a certain impact