Method for extracting rare earth from weathered crust strain amass type rare earth ore

A weathering crust leaching type, rare earth ore technology, applied in the direction of improving process efficiency, can solve the problems of inability to obtain products, good precipitation effect, reducing the purity of rare earth concentrate products, etc., to improve leaching rate, eliminate ammonia nitrogen pollution, The effect of increasing rare earth leaching rate

Active Publication Date: 2017-07-21
JIANGXI UNIV OF SCI & TECH
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Problems solved by technology

For the calcium oxide precipitant, it is a slightly soluble substance, the precipitation reaction is fast, and the precipitation effect is good. However, there are sulfates in the leaching agent of the weathering crust leaching type rare earth ore, resulting in a large amount of sulfate i

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  • Method for extracting rare earth from weathered crust strain amass type rare earth ore

Examples

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Effect test

Embodiment 1

[0037] Example 1: Magnesium sulfate solution was used to leaching weathering crust elution-type rare earth ore to obtain an aluminum content of 0.05 g / L and a rare earth content of 0.3 g / L (calculated as REO). Calcium oxide is added to the leaching solution, the pH of the solution is adjusted to 5.2 for impurity removal, and then the impurity removal residue and the impurity removal mother liquor are obtained by filtering and washing with water. Calcium oxide is added to the impurity removal mother liquor for precipitation, the temperature is 20°C, and the pH of the precipitation end point is controlled to be 8.5; then, the precipitation mother liquor and precipitation residue are obtained by filtering and washing with water. The precipitated residue is stirred and washed with polyaspartic acid additive solution, the total molar concentration of the additive is controlled to be 0.002mol / L, the liquid-solid ratio is 0.5:1, the temperature is 20°C, and the pH is 11.0; then solid-...

Embodiment 2

[0038] Example 2: The weathering crust leaching type rare earth ore was leached with a sulfate solution containing magnesium and sodium to obtain an aluminum content of 0.1 g / L and a rare earth content of 0.5 g / L (calculated as REO). Calcium hydroxide is added to the leaching solution, the pH of the solution is adjusted to 5.2 for impurity removal, and then the impurity removal residue and the impurity removal mother liquor are obtained by filtering and washing with water. Calcium hydroxide is added to the impurity removal mother liquor for precipitation, the temperature is 20°C, and the pH of the precipitation end point is controlled to be 8.5; then, the precipitation mother liquor and precipitation residue are obtained by filtering and washing with water. The precipitated residue is stirred and washed with polyacrylic acid additive solution, the total molar concentration of the additive is controlled to 0.002mol / L, the liquid-solid ratio is 0.5:1, the temperature is 20°C, and...

Embodiment 3

[0039] Example 3: The weathered crust leached type rare earth ore was leached with sulfate and chloride solutions containing magnesium and potassium to obtain an aluminum content of 0.3 g / L and a rare earth content of 2 g / L (calculated as REO). Calcium oxide is added to the leaching solution, the pH of the solution is adjusted to 5.4 for impurity removal, and then the impurity removal residue and the impurity removal mother liquor are obtained by filtering and washing with water. Calcium oxide is added to the impurity removal mother liquor for precipitation, the temperature is 40°C, and the pH of the precipitation end point is controlled to be 9; then the precipitation mother liquor and precipitation residue are obtained by filtering and washing with water. The precipitated residue is stirred and washed with a mixed additive solution of polyaspartic acid and sodium ethylenediamine tetramethylene pyridene phosphonate (molar ratio 0.5:1), and the total molar concentration of the ...

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Abstract

The invention discloses a method for extracting rare earth from weathered crust strain amass type rare earth ore. The weathered crust strain amass type rare earth ore is leached through a leaching agent to obtain rare earth lixivium; then an alkaline calcium compound is added into the rare earth lixivium to carry out impurity removal and sedimentation, and rare earth hydroxide sediment residues are obtained; an organic auxiliary containing solution is adopted for stirring and washing, and the total molar concentration, the liquid-solid ratio, temperature, pH and the like of an auxiliary are controlled; and the auxiliary is combined with calcium in the sediment residues, calcium sulfate in the residues is dissolved, and therefore the final product purity is improved. In addition, through adding of the auxiliary, the auxiliary can return to be used for ore leaching, the function of enhancing leaching is achieved under the acid condition, and the leaching rate of the rare earth is improved. According to the method, ammonia nitrogen pollution is removed, the rare earth leaching rate is increased, meanwhile, formed calcium sulfate in the sediment process of the alkaline calcium compound is reduced, production cost is reduced, and meanwhile products with qualified purity are obtained.

Description

technical field [0001] The invention relates to the field of rare earth hydrometallurgy, in particular to a method for extracting rare earth from weathering crust leaching type rare earth ore. Background technique [0002] Weathering crust leaching-type rare earth minerals are a new type of exogenous rare earth minerals, which were first discovered in Ganzhou, Jiangxi Province, my country in 1969, and are widely distributed in seven southern provinces including Jiangxi, Guangdong, Guangxi, Hunan, Fujian, Yunnan, and Zhejiang. . This kind of minerals has a complete distribution of rare earths, low radioactivity, and is rich in medium and heavy rare earth elements. It is a valuable strategic mineral resource in my country. Its development and utilization enriches medium and heavy rare earth resources, and can solve the problem that traditional endogenous rare earth ores almost only produce light rare earths. [0003] Under normal circumstances, the grade of full-phase rare ea...

Claims

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Application Information

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IPC IPC(8): C22B3/04C22B3/44C22B1/02C22B59/00
CPCC22B1/02C22B3/04C22B3/44C22B59/00Y02P10/20
Inventor 肖燕飞黄莉聂华平焦芸芬杨润
Owner JIANGXI UNIV OF SCI & TECH
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