Ore leaching method of weathered crust ion-adsorption type rare earth ore and rare earth product

Abstract

The invention relates to the field of hydrometallurgy, in particular to an ore leaching method of weathered crust ion-adsorption type rare earth ore and a rare earth product. The ore leaching method of weathering crust ion-adsorption type rare earth ore comprises the following steps that the weathering crust ion-adsorption type rare earth ore is leached with a leaching agent, and a rare earth leaching solution flowing out from the bottom of ore soil is collected twice; and after impurities are removed and rare earth is precipitated from the rare earth leaching solution collected for the firsttime, the rare earth leaching solution is mixed with the rare earth leaching solution collected for the second time, the leaching agent is added, and a mixed solution is returned to the rare earth oreas a fresh leaching agent for leaching operation. The ore leaching method is simple and feasible, the operation load of hydrometallurgy work is reduced, and economic and environment protection are achieved.

Description

technical field [0001] The invention relates to the field of hydrometallurgy, in particular to an ore leaching method for weathering crust leaching type rare earth ore and rare earth products. Background technique [0002] The reserves of medium and heavy rare earths contained in weathering crust elution-type rare earth ores account for more than 80% of the world, making up for the lack of low heavy rare earth content in mineral-type rare earth ores. They have received great attention from downstream industries that use medium and heavy rare earths, and are extremely valuable Mineral resources, its development and utilization play a pivotal role in the world rare earth industry. [0003] At present, the leaching processes commonly used in weathering crust leaching type rare earth ores are heap leaching process and in-situ leaching process. Both of them inject a certain amount of leaching agent solution into the ore soil first, and the leaching agent solution is injected down...

AI Technical Summary

Problems solved by technology

The above-mentioned traditional rare earth leaching solution circulation leaching method is to collect the rare earth leaching solution flowing out from the bottom of the ore soil at one time, so the collected rare earth leaching solution has a large amount and a low rare earth concentration, generally only 0.5-1.5g / L

A large amount of rare earth leaching solution needs to remove impurities and precipitate rare earths. The hydrometallurgy operation load is heavy, the production cycle is long, and more structures such as impurity removal tanks and sedimentation tanks need to be prepared, and the infrastructure investment is high; the concentration of rare earths in the rare earth leaching solution is too low. This leads to more loss of rare earth in the impurity removal process, increased consumption of precipitant, and low recovery rate of rare earth

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