LEACHING AGENT AND LEACHING METHOD FOR LEACHING RARE EARTH IN ION-ADSORBED RARE EARTH ORE

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A leaching agent and leaching method for leaching a rare earth element in an ion-adsorbed rare earth ore; the leaching agent is an aqueous solution comprising reducing ions. The present invention uses the aqueous solution comprising the reducing ions as a leaching agent to leach an ion-adsorbed rare earth ore, and leaches an ionic phase rare earth element from a rare earth ore via an ion exchange method. In addition, the present invention utilizes the reducing action of the reducing ions so as to enable high-valence rare earth ions in a colloidal phase and a mineral phase to undergo a reduction reaction, such that low-valence ions leach out, thus improving a leaching rate of a rare earth element in the ion-adsorbed rare earth ore.