A method for extracting rare earth from ion adsorption type rare earth ore

An ion adsorption type, rare earth ore technology, applied in the field of rare earth extraction, can solve the problems of unavailable products, good effect, unqualified product purity, etc., to reduce the formation of calcium sulfate, reduce the generation of calcium sulfate, and weaken the migration speed Effect

Active Publication Date: 2019-06-11
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In response to this problem, experts have also proposed related solutions (CN103436720, CN102190325, CN104152693), but they all have problems and cannot be implemented; CN101475202 uses calcium oxide or a mixture of calcium oxide and seed crystals as a precipitant to precipitate rare earth rare earths in solution
As for the calcium oxide precipitant, it is a slightly soluble substance, and the precipitation reaction is fast and the effect is good. However, there are sulfates in the leaching agent of the ion-adsorption rare earth ore, which causes a large amount of sulfate radicals to be contained in the leaching solution. Calcium oxide is used alone as the Precipitating agent, which will produce a large amount of calcium sulfate precipitation in the process of precipitating ion ore leachate, also greatly reduces the purity of rare earth concentrate products, and cannot obtain qualified products
At the same time, hydroxide precipitation has poor crystallization performance, resulting in poor filtration performance and low production efficiency.
[0005] In summary, how to provide an extraction method for ion-adsorption type rare earth ores to remove ammonia nitrogen pollution and solve the problem of unqualified product purity caused by calcium sulfate precipitation in the calcium oxide precipitation process has become a technical problem to be solved urgently

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  • A method for extracting rare earth from ion adsorption type rare earth ore

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Effect test

Embodiment 1

[0037] Example 1: Using a magnesium-containing sulfate and chloride mixed solution (the molar ratio of sulfate and chloride is 0.5:1) to leach ion-adsorbed rare earth ores, the obtained aluminum content is 0.05g / L, and the rare earth content is 0.3g / L (calculated as REO) leach solution; add calcium oxide to the leach solution obtained in step (1), adjust the pH of the solution to 5.2 for impurity removal, filter and wash with water after impurity removal to obtain impurity removal residue and impurity removal mother liquor. Add magnesium chloride to the impurity-removing mother liquor obtained in step (2), and control the chloride ion concentration in the impurity-removing mother liquor to 0.30 mol / L. Calcium oxide is then added to the impurity removal mother liquor for precipitation, the precipitation temperature is 25°C, and the pH of the precipitation end point is controlled to be 8.5; after the precipitation is completed, solid-liquid separation is carried out, and the prec...

Embodiment 2

[0038] Example 2: Using a mixed solution of sulfate and chloride containing magnesium (the molar ratio of sulfate and chloride is 0.5:1) to leach ion-adsorption type rare earth ore, the obtained aluminum content is 0.1g / L, and the rare earth content is 0.5g / L (calculated by REO) leachate; add calcium hydroxide to the leachate, adjust the pH of the solution to 5.2 for impurity removal, filter and wash with water after impurity removal to obtain impurity removal residue and impurity removal mother liquor. Add magnesium chloride to the impurity removal mother liquor, and control the chloride ion concentration in the impurity removal mother liquor to be 0.30mol / L. Calcium hydroxide is then added to the impurity removal mother liquor for precipitation, the precipitation temperature is 25°C, and the pH of the precipitation end point is controlled to be 8.5; after the precipitation is completed, solid-liquid separation is carried out, and the precipitation mother liquor and precipitat...

Embodiment 3

[0039] Example 3: Using a mixed solution of sulfate and chloride containing magnesium and potassium (the molar ratio of sulfate and chloride is 2:1) to leach ion-adsorbed rare earth ores to obtain a rare earth mineral with an aluminum content of 0.3g / L. Leach solution with a content of 2g / L (calculated as REO); add calcium oxide to the leach solution, adjust the pH of the solution to 5.4 for impurity removal, filter and wash with water after impurity removal to obtain impurity removal residue and impurity removal mother liquor. Add magnesium chloride and potassium chloride to the impurity removal mother liquor, and control the chloride ion concentration in the impurity removal mother liquor to be 0.40mol / L. Calcium oxide is then added to the impurity removal mother liquor for precipitation, the precipitation temperature is 40°C, and the pH of the precipitation end point is controlled to be 8.8; after the precipitation is completed, solid-liquid separation is carried out, and th...

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Abstract

The invention discloses a method for extracting rare earth from ion adsorption type rare earth ores. The method comprises the following steps: leaching the ion adsorption type rare earth ores by a leaching agent to obtain rare earth leachate; then adding a calcium-alkali compound in the rare earth leachate to remove impurities; adding at least one of magnesium chloride, sodium chloride and potassium chloride in impurity removal mother liquor; and controlling the chloride ion concentration, the temperature and the pH in a precipitation process of the calcium-alkali compound to achieve the purpose of increasing solubility of calcium sulfate and reduce generation of the calcium sulfate in the precipitation process. Meanwhile, under the related conditions of high salinity and the like, the migration speeds of rare earth ions and hydroxyl ions in a precipitation system of the calcium-alkali compound are reduced, the degree of supersaturation of rare earth hydrate is controlled effectively, and crystal precipitates of the rare earth hydrate is facilitated. By the method, ammonia nitrogen pollution is eliminated, formation of the calcium sulfate in the precipitation process of the calcium-alkali compound is reduced, the production cost is reduced, and meanwhile, the product with qualified purity is 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 ion-adsorption type rare earth ore. Background technique [0002] Rare earth (Rare Earth, 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, 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 magnetic, optical, electrical,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B59/00
CPCC22B59/00
Inventor 肖燕飞高国华黄莉徐志峰徐耗祥
Owner JIANGXI UNIV OF SCI & TECH
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