A kind of leaching agent and its preparation method and application

Abstract

An ore leaching agent, a preparing method thereof and applications of the agent are disclosed. The method includes crushing magnesite containing iron, manganese and calcium, then mixing the crushed magnesite with water to obtain slurry, then adding an acid, and decomposing the mixture until a product is weakly acidic to obtain the liquid ore leaching agent. The application relates to application in ionic type rare earth ore mining projects. The ore leaching agent allows an enterprise to achieve operation free of ammonia nitriding, real green production can be achieved, and soil is made nutritious. The ore leaching speed and the concentration of leaching mother liquor are increased, the liquid amount and the subsequent process treating amount are reduced, an ore leaching period can be shortened by 20-40% or above, the cost is reduced, and the yield is increased by 20%. Compared with ore leaching levels of the prior art, technical and economic indexes are comprehensively increased, the full-phase rare earth recovery rate is increased by 3-6%, and the direct cost per unit is reduced. In addition, compactness of ore particle structured is increased, mountain (ore) body structure stability is relatively maintained, and the possibility of unstable ore body slippage is reduced.

Description

technical field [0001] The invention relates to the technical field of mining technology, in particular to an ore leaching agent and its preparation method and application. Background technique [0002] For the "ionic" rare earth mines in the south, how to "leach" (or "desorb") the rare earth minerals in the "ion" state from the ore (body), the prior art process mainly uses "mineral leaching agent" to Rare earth leaching from ore bodies. The "leaching agent" for "leaching" ionic rare earths initially used sodium chloride, and then ammonium sulfate was generally used. [0003] "Ore leaching" refers to excavating the liquid injection well (or hole) inside the ore body according to the prescribed method and requirements, and injecting the ore leaching agent solution (electrolyte solution) directly through the liquid injection well (hole) ore body. The chemically more active cations in the electrolyte exchange and desorb the rare earth cations that are adsorbed on the surface...

AI Technical Summary

Problems solved by technology

[0007] (2) The concentration of the leaching mother liquor is low, the liquid volume is large, and the treatment cost is high, so it cannot be directly extracted and separated into the tank

[0008] (3) In the whole production process, the rare earth leaching cycle is longer, and the production cycle of a complete production process is longer

[0009] (4) If the owner has insufficient technical knowledge, improper project layout and management, the internal friction (structural force) of the mountain (mine) body is reduced during the leaching process, and the structure of the mountain (mine) body is prone to "unstable" state, which is easy to Causing "Geological Problems"

[0010] (5) The ammonium sulfate leaching agent used in this process is mainly suitable for the leaching of "ionic phase" rare earths in "full phase" rare earths, and there is a lack of research on the recovery of "other phases" of rare earths including "four phases and eight states". , resulting in poor utilization of "other phase" rare earth resources by the leaching agent used in this process

[0011] (6) In the ammonium sulfate leaching agent, only the "single" "NH 4 + "Ion, its leaching efficiency, especially for "other phases" rare earths is poor

[0012] (7) The ammonium sulfate leaching agent does not consider improving the soil structure and improving the soil nutrient level.

[0013] (8) The ammonium sulfate leaching agent does not make a fuss about the agent itself, and maintains the stability of the mountain (mine) body through leaching

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