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Auxiliary leaching agent for ion-type rare earth ore leaching and ore leaching method thereof

A technology of ionic rare earth ore and leaching aid, which is applied in the direction of improving process efficiency, can solve problems such as ecological security threats and excessive ammonia nitrogen, and achieve the effects of reducing dosage, reducing ammonia nitrogen pollution, and reducing production costs.

Inactive Publication Date: 2015-11-25
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Even if the wastewater is diluted with surface water and groundwater, the ammonia nitrogen content in the wastewater can reach about 100ppm. The ammonia nitrogen in the water system in the mining area seriously exceeds the standard, and the water body becomes eutrophic, which poses a great threat to ecological security.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030]Take 500 g of dry Longnan ionic rare earth ore with an ionic phase rare earth grade of 1.04‰, and put it into a leaching column with an inner diameter of 45 mm. Ammonium sulfate was used as the leaching agent, EDTA was used as the leaching aid, and a leaching solution with an ammonium sulfate concentration of 0.18mol / L and an EDTA concentration of 0.03mol / L was prepared for column leaching experiments, and the flow rate of the leaching process was controlled by a peristaltic pump to 0.6ml / L. After injecting 210ml of leaching solution, wash with top water instead, and stop washing when the concentration of rare earth in the effluent of the leaching column is less than 0.1g / L, and finally obtain 346ml of rare earth leaching solution and rare earth tailings. The rare earth concentration in the rare earth leach solution is 1.48g / L (calculated as REO), and the rare earth leaching rate is 98.5%.

Embodiment 2

[0032] Take 500 g of dry Longnan ionic rare earth ore with an ionic phase rare earth grade of 1.04‰, and put it into a leaching column with an inner diameter of 45 mm. Ammonium sulfate was used as the leaching agent, EDTA was used as the leaching aid, and a leaching solution with an ammonium sulfate concentration of 0.12mol / L and an EDTA concentration of 0.04mol / L was prepared for column leaching experiments. The flow rate of the leaching process was controlled by a peristaltic pump to 0.6ml / L. After injecting 210ml of leaching solution, use top water to wash, and stop washing when the concentration of rare earth in the effluent of the leaching column is less than 0.1g / L, and finally obtain 353ml of rare earth leaching solution and rare earth tailings. The rare earth concentration in the rare earth leach solution is 1.39g / L (calculated as REO), and the rare earth leaching rate is 94.2%.

Embodiment 3

[0034] Take 500 g of dry Longnan ionic rare earth ore with an ionic phase rare earth grade of 1.04‰, and put it into a leaching column with an inner diameter of 45 mm. Using calcium chloride and ammonium chloride as leaching agents and HEDTA as a leaching aid, the column leaching experiment was carried out by preparing leaching solutions with calcium chloride and ammonium chloride concentrations of 0.05mol / L and HEDTA concentrations of 0.10mol / L. , The peristaltic pump controls the flow rate of the leaching process to 0.6ml / L. After injecting 500ml of leaching solution, wash with top water instead, and stop washing when the concentration of rare earth in the effluent of the leaching column is less than 0.1g / L, and finally obtain 393ml of rare earth leaching solution and rare earth tailings. The rare earth concentration in the rare earth leach solution is 1.29g / L (calculated by REO), and the rare earth leaching rate is 97.3%.

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Abstract

The invention discloses an auxiliary leaching agent for ion-type rare earth ore leaching and an ore leaching method thereof. The auxiliary leaching agent is a water-soluble aminopolycarboxylic acid compound, and ion-type rare earth ores are leached by adopting an ore leaching solution formed by mixing a leaching agent with the auxiliary leaching agent. An RE-N coordination compound can be formed via nitrogen-atoms on amino groups during coordination of the auxiliary leaching agent and rare earth, an RE-O coordination compound can be formed via oxygen atoms on carboxyls, the complexing constant of rare earth and the auxiliary leaching agent is increased, and an obtained rare earth complex is more stable, so that the leaching reinforcement effect is improved. After the auxiliary leaching agent is used in the ore leaching process, the rare earth leaching rate is increased, the use amount of the leaching agent is reduced, the production cost is reduced, and the ammonia nitrogen pollution is reduced.

Description

technical field [0001] The invention relates to the field of rare earth hydrometallurgy, in particular to a leaching aid for ion-type rare earth ore leaching and a leaching method thereof. Background technique [0002] Rare earth (RareEarth, referred to as RE) is the 15 lanthanide elements with atomic numbers from 57 to 71 in the third subgroup of the periodic table of chemical elements, namely lanthanum (La), cerium (Ce), praseodymium (Pr), neodymium (Nd) , promethium (Pm), samarium (Sm), europium (Eu), gadolinium (Gd), terbium (Tb), dysprosium (Dy), holmium (Ho), erbium (Er), thulium (Tm), ytterbium (Yb) , lutetium (Lu), plus scandium (Sc) and yttrium (Y), which are similar in electronic structure and chemical properties, are a general term for a total of 17 elements. Due to their unique 4f sublayer electronic structure, large atomic magnetic moment, strong spin-orbit coupling, and variable coordination numbers, the compounds formed by rare earth elements have very rich m...

Claims

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Application Information

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IPC IPC(8): C22B3/04C22B59/00
CPCY02P10/20
Inventor 肖燕飞黄莉徐志峰
Owner JIANGXI UNIV OF SCI & TECH
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