Ion-type rare-earth ore ammonium-free environment-friendly exploitation technique

Abstract

The invention discloses an ion-type rare-earth ore ammonium-free environment-friendly exploitation technique. The ion-type rare-earth ore ammonium-free environment-friendly exploitation technique comprises the following steps that an ammonium-free ore leaching agent with a certain concentration is injected through liquid injecting holes distributed in a stope to be subjected to an ion exchanging reaction with rare-earth ores so as to obtain mother liquid enriched in rare-earth positive ions; the mother liquid seeps and gathers into liquid collecting engineering such as matching of ore-layer natural water partition bottom plates or artificial liquid collecting roadways with liquid collecting flow guiding holes; and then the mother liquid is conveyed to a hydrometallurgy workshop through a main conveying pipeline, ammonium-free agents are used for impurity removal and precipitation to obtain rare-earth carbonate, and supernatant liquid is circulated back to a liquid preparation pool andthen subjected to pH valve adjustment and agent adding, and returns to the stope to serve as a new ammonium-free ore leaching agent. The ion-type rare-earth ore ammonium-free environment-friendly exploitation technique has the advantages that ammonium is avoided in the overall process, and environmental friendliness is achieved on soil and water bodies; production waste water is circularly and comprehensively utilized, and harmful waste discharging is avoided; and the leaching rate, liquid collecting rate and precipitating rate of the rare-earth ions are high, and the resource mining comprehensive recovery rate is increased.

Description

technical field [0001] The invention relates to the technical field of green and environment-friendly mining of ion-type rare earth ores, in particular to the ammonium-free mining technology of ion-type rare earth ores. Background technique [0002] Weathering crust ion-adsorption rare earth is a unique rare earth mineral discovered in Jiangxi in 1969. The rare earth elements mainly exist in the weathering crust clay minerals as hydrated or hydroxyl hydrated cations, and the rare earth element products are obtained through cation exchange leaching and precipitation. [0003] The production of rare earth mines has undergone many major changes from mining methods to leaching and precipitation methods. Mining from the mine has experienced pool leaching-heap leaching-in-situ leaching, from the leaching method through indoor salt barrel leaching-field ammonium sulfate pool leaching-field ammonium sulfate in-situ leaching, and from the precipitation method has experienced the seco...

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Problems solved by technology

[0010] The present invention aims to provide an ammonium-free, green and environmentally friendly mining process for ionic rare earth ores, and solve the problems of serious environmental pollution of soil and water; low efficiency of ore leaching, impurity removal, and precipitation, and low comprehensive recovery rate of rare earth resources

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