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

A weathering crust elution type, rare earth ore technology, applied in the direction of improving process efficiency, can solve the problems of increased consumption of precipitant, large amount of rare earth leaching liquid, heavy hydrometallurgy work load, etc., to shorten the production cycle and improve the rare earth and impurity ion concentration, reducing the effect of workload

Active Publication Date: 2019-05-07
SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES
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  • Abstract
  • Description
  • Claims
  • Application Information

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 hydro

Method used

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

Examples

Experimental program
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Effect test

Embodiment 1

[0039] S1. Leaching weathering crust leaching type rare earth ore

[0040] Weigh 250g of dried weathering crust elution-type rare earth ore sample, slowly and evenly put it into a glass column with a diameter of 45mm, spread 2 to 3 layers of filter paper on the surface of the ore layer, and then pass through a constant flow pump at a speed of 0.4mL / min With 100mL of 2% ammonium sulfate solution, the liquid-solid ratio of the volume (L) of the ammonium sulfate solution to the mass (kg) of the rare earth ore is 0.4:1 at this time, and the ammonium sulfate solution is sent to the top of the ore sample for leaching. After the ammonium sulfate solution is completely injected into the glass column, 200mL of distilled water is used for top water operation. At this time, the liquid-solid ratio of distilled water (L) to the mass of rare earth minerals (kg) is 0.8:1.

[0041] S2, collecting the rare earth leach solution twice

[0042] Use a beaker to collect the rare earth leaching sol...

Embodiment 2-6

[0050] The ore leaching method of a kind of weathering crust leaching type rare earth ore provided in Implementation 2-6 is basically the same as the leaching method of a kind of weathering crust leaching type rare earth ore provided in the embodiment, the difference is that the specific operating conditions change .

Embodiment 2

[0052] S1. Leaching weathering crust leaching type rare earth ore

[0053] The leaching agent is 3% ammonium sulfate, and the liquid-solid ratio is 1.2:1 during top water operation.

[0054] S2, collecting the rare earth leach solution twice

[0055] The rare earth leach solution collected for the first time had a rare earth concentration of 3.63g / L and an impurity aluminum concentration of 0.41g / L.

[0056] S3, impurity removal and precipitation steps

[0057] Add 5 mL of 5% ammonium bicarbonate solution during the impurity removal process, adjust the pH to 4.8, stir for 1.5 h, and let it stand for 4 h.

[0058] Add 10mL of 5% ammonium bicarbonate solution to the impurity-removed leaching solution, stir for 2 hours, and then let it stand and age for 6 hours. In the rare earth carbonate product, the rare earth purity reaches 97.34%, and the rare earth recovery rate is 98.12%.

[0059] Add ammonium sulfate solid to the supernatant to make the concentration of ammonium sulfat...

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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...

Claims

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Application Information

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IPC IPC(8): C22B3/04C22B59/00
CPCY02P10/20
Inventor 何正艳张蓉聂文蕊徐志高吴明瞿军沙傲阳
Owner SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES
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