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Ion-adsorption-type rare earth extracting method

A technology of ion adsorption type and extraction method, which is applied in the field of extraction of ion adsorption type rare earths, and can solve problems such as threats to groundwater systems, mine ammonia nitrogen harming the surrounding ecological environment, ammonium sulfate retention, etc.

Active Publication Date: 2013-08-28
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, ammonium sulfate and other ammonia solutions are mostly used as leaching agents in ionic rare earth mines, and ammonium bicarbonate is used as precipitation reagent. For every ton of rare earth mined, about 7 tons of ammonium sulfate and about 3.5 tons of ammonium bicarbonate are consumed, and ammonia nitrogen-containing wastewater is produced. About 1000-1200 cubic meters, the discharge of ammonia nitrogen from the mine seriously endangers the surrounding ecological environment; on the other hand, the in-situ leaching of ore causes the leaching agent ammonium sulfate to stay in the mountain or enter the groundwater system, posing a potential threat to the groundwater system

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Ion adsorption type rare earth ore composition: REO0.34%, take 500 grams of rare earth ore and put it into The plexiglass column, with 854ml of magnesium sulfate aqueous solution with a mass percentage concentration of 1% as a leaching agent, is used for column leaching. After the leaching is completed, it is washed with 500ml of pure water. The average concentration of REO in the leaching solution is 2.98g / L, and the rare earth leaching The rate is 175.22%. An equal volume of 0.01% by mass magnesium hydroxide aqueous solution is added to the leaching solution for impurity removal. The precipitation time was 1 hour and the temperature was 40°C. The pH value at the end of precipitation is controlled at 3.5, the precipitation rate of impurity iron and aluminum is 99.5%, and the precipitate is dissolved with a sulfuric acid solution with a volume ratio of 10% and then returned to leaching.

Embodiment 2

[0019] Ion adsorption type rare earth ore composition: REO0.34%, take 10 grams of rare earth ore and put it into The plexiglass column, with 50ml mass percent concentration of 3% magnesium sulfate aqueous solution as the leaching agent, carries out column leaching, washes with 50ml pure water after leaching, the average rare earth ion concentration of the leachate is 0.50g / L, and the rare earth leaching rate is 91.00 %. An equal volume of 0.01% by mass magnesium carbonate aqueous solution is added to the leaching solution for impurity removal. The precipitation time was 1 hour and the temperature was 40°C. The pH value at the end of the precipitation is controlled at 3.5, the precipitation rate of impurities iron and aluminum is 99.6%, and the precipitate is dissolved with a sulfuric acid solution with a volume ratio of 10% and then returned to leaching.

Embodiment 3

[0021] Ion adsorption type rare earth ore composition: REO0.074%, take 100 grams of rare earth ore and put it into The plexiglass column, with 100ml mass percent concentration of 3% ferric sulfate aqueous solution as the leaching agent, carries out column leaching, washes with 100ml pure water after leaching, the average rare earth ion concentration of the leachate is 0.48g / L, and the rare earth leaching rate is 100.54 %. An equal volume of 0.01% by mass magnesium hydroxide aqueous solution is added to the leaching solution for impurity removal. The precipitation time was 1 hour and the temperature was 40°C. The pH value at the end of the precipitation is controlled at 4, the precipitation rate of impurities iron and aluminum is 99.9%, and the precipitate is dissolved with a sulfuric acid solution with a volume ratio of 10% and then returned to the ore for leaching.

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Abstract

The invention relates to an ion-adsorption-type rare earth extracting method. The method comprises the following steps of: by taking an aqueous solution containing magnesium sulfate or the magnesium sulfate and / or ferric sulfate or the magnesium sulfate and / or aluminum sulfate as main components as an ore leaching agent, leaching ion-adsorption-type rare earth ore; dissolving rare earth ions in the rare earth ore with magnesium, ferric and aluminum ions and the like in an iron exchanging manner, thereby obtaining a leachate; and by taking magnesium hydrate or magnesium oxide or magnesium carbonate as a precipitator, thereby generating a rare earth hydrate or a rare earth carbonate. The method is simple in process and strong in raw material adaptability, and can be used for economically and effectively leaching the rare earth from the ion-adsorption-type rare earth ore, thereby completely avoiding the problem of ammonia nitrogen pollution caused by an existing leaching process. Therefore, the method is a sanitary production process.

Description

technical field [0001] The invention relates to a rare earth extraction method, in particular to an ion adsorption type rare earth extraction method. Background technique [0002] my country is extremely rich in rare earth resources. The rare earth reserves account for about 36% of the world's rare earth resources, and the output accounts for 97% of the world's demand. Among them, the proven reserves of ion-adsorbed rare earths are only 1.48 million tons, accounting for only 1.4% of the world's industrial reserves of rare earth resources. About %, ion-adsorbed rare earth is a kind of rare earth ore in which rare earth elements do not exist in the form of mineral phases, but are adsorbed in clay minerals in an ion state. Due to the characteristics of small resource reserves, concentrated distribution and complete distribution, high content of high value-added elements, low radioactivity ratio, high-tech applications, especially military application elements, and high comprehen...

Claims

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Application Information

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IPC IPC(8): C22B3/04C22B3/44C22B59/00
CPCY02P10/20
Inventor 王瑞祥杨幼明杨斌聂华平叶信宇廖春发余攀沈文明
Owner JIANGXI UNIV OF SCI & TECH
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