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Method for electrified mining of rare earth ores and leaching agents for electrified mining of rare earth ores

A rare earth ore and leaching technology, which is applied in the direction of improving process efficiency and can solve problems such as the reduction of electroosmotic flow

Active Publication Date: 2020-12-01
GUANGZHOU INST OF GEOCHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the embodiments of the present application is to provide a method for electrification mining of rare earth ores and a leaching agent for electrification mining of rare earth ores, which aims to improve the problem that electroosmosis decreases over time in the existing methods of electrification mining rare earth ores

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  • Method for electrified mining of rare earth ores and leaching agents for electrified mining of rare earth ores
  • Method for electrified mining of rare earth ores and leaching agents for electrified mining of rare earth ores

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Effect test

Embodiment 1

[0088] This embodiment provides a method for laboratory simulation of electrification mining rare earth mines, including:

[0089] A cylindrical device with diameter*height=6cm*12cm is used to simulate electric mining of ion-adsorption type rare earth ore. First, 0.1kg of semi-weathered layer, 0.2kg of fully weathered layer and 0.1kg of topsoil samples were added to the cylindrical tube from bottom to top to simulate weathered crust samples, and they were compressed to 3cm, 6cm and 3cm respectively. Add 80mL of calcium carbonate suspension with a molar concentration of 0.1mol / L and 80mL of ammonium sulfate solution with a molar concentration of 0.1mol / L to the simulated weathering crust sample, and then continue to drop 0.4mL / min of ionized water. Apply graphite electrode plates on the upper and lower sides of the columnar device and connect a 24V DC power supply to maintain the voltage gradient of the system at 2V / cm, continuously receive leachate at the cathode and record t...

Embodiment 2

[0097] This embodiment provides a method for electrifying rare earth mines, which was tested in Renju Mining Area, Meizhou City, Guangdong Province; the method for electrifying rare earth mines includes:

[0098] (1) Mine layout: Drill 20 liquid injection wells on the rare earth mine body, and set anodes in the liquid injection wells; drill two liquid collection holes at the foot of the mountain, and set cathodes in the liquid collection holes; Attach filter cloth, excavate a liquid collecting ditch under the cathode liquid collecting hole, and set a liquid collecting pool at both ends of the liquid collecting ditch, the position of the liquid collecting pool is 3 meters below the liquid collecting ditch, and the cathode liquid collecting hole is set Above the liquid ditch, and the liquid outlet end of the cathode liquid collecting pipe is connected to the liquid collecting ditch.

[0099] (2) In-situ leaching: inject a mixed suspension of calcite and ammonium sulfate with a m...

Embodiment 3

[0107] This embodiment provides a method for electrifying rare earth mines, which was tested in Renju Mining Area, Meizhou City, Guangdong Province; the difference between this method and Embodiment 2 lies in steps (2) and (3); in this embodiment:

[0108] (2) In-situ leaching: Inject ammonium sulfate and sodium carbonate suspensions with a molar concentration of 0.05mol / L into the anode liquid injection pipe at a liquid-solid mass ratio of 1:3.

[0109] (3) Collection of mother liquor: use the anode liquid injection pipe and the cathode liquid collection pipe as the positive and negative poles, add a potential difference of 0.05V / cm, pass direct current, and accelerate the liquid to flow to the cathode liquid collection pipe, collect water first in the liquid collection ditch, and then collect Low-concentration mother liquor is obtained, and finally the mother liquor that reaches the industrial standard is collected. First, the water collected in the collection ditch is discha...

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Abstract

The invention relates to the field of rare earth mining, in particular to a method for electrified mining of rare earth ores and leaching agents for electrified mining of the rare earth ores. The method for electrified mining of the rare earth ores comprises the steps that an anode is arranged in at least one liquid injection well, at least one cathode is arranged on a mine, and the anodes and thecathodes are arranged at intervals; the leaching agents are added into well injection liquid, and voltages are applied to the anodes and the cathodes; and the leaching agents comprise carbonate. Carbonate and H<+> generated in the electrifying process near the anodes are subjected to a dissolution reaction, the effect of neutralizing the H<+> in an anode area is achieved, and when the H<+> is neutralized and the concentration is reduced to be insufficient to dissolve carbonate, the soil pH is kept unchanged. Therefore, carbonate in the leaching agents can adjust and stabilize the pH of the anode area, maintain electroosmotic flow and ensure continuous performing of electrified mining. Carbonate reacts with H<+> under the acidic condition of the anode area to release metal cations to replace ionic rare earth in the rare earth ores, and the rare earth mining efficiency is improved.

Description

technical field [0001] The present application relates to the field of rare earth mining, in particular, to a method for electrifying rare earth mining and a leaching agent for electrifying rare earth mining. Background technique [0002] Ion-adsorbed rare earth ores are the source of more than 90% of the world's heavy rare earths, and are extremely important strategic resources. Rare earths in ion-adsorption rare earth ores mainly exist in the form of hydration or hydroxyl water and cations, so rare earths can be leached by ion exchange between electrolyte solution and rare earths. The current mainstream mining method is the in-situ leaching process. [0003] The in-situ leaching process is to inject the leaching agent into the pre-dug liquid injection well network. The leaching agent will replace the rare earth ions in the ore body during the gradual infiltration process, and the obtained rare earth leaching mother liquor will be formed through the liquid collection ditch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B59/00C22B3/04
CPCC22B3/045C22B59/00Y02P10/20
Inventor 何宏平朱建喜王高锋冉凌瑜王园园陈情泽马灵涯魏景明朱润良
Owner GUANGZHOU INST OF GEOCHEMISTRY - CHINESE ACAD OF SCI