A method for reducing sulfate radical content in rare earth hydroxide

A rare earth hydroxide and hydrogen oxidation technology, applied in chemical instruments and methods, rare earth metal oxides/hydroxides, rare earth metal compounds, etc., can solve the problem of high sulfate radicals, achieve obvious effects, and the process is simple and easy to control

Active Publication Date: 2017-04-05
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The object of the present invention is to provide a method for reducing the content of sulfate in rare earth hydroxides with simple process and easy operation, aiming at the problem that the sulfate radicals in rare earth hydroxide precipitates obtained by precipitation of rare earth sulfate solution by hydroxide precipitation are too high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Add the lanthanum hydroxide containing sulfate radical 5wt.% in the acetic acid solution, the molar weight of acetic acid in the acetic acid solution is 1.25 times of the sulfate radical molar weight in the lanthanum hydroxide, and the liquid-solid ratio of the acetic acid solution and the lanthanum hydroxide is 2L / kg, using sodium hydroxide solution to control the pH of the coordination solution to 7.0, at 70 o C for 60 min. Solid-liquid separation then, the solid that obtains carries out washing, stops washing when sulfate radical is less than 10ppm in washing filtrate; At 100 o C was dried for 12 hours to finally obtain lanthanum hydroxide with a sulfate radical content of 0.42wt.%.

Embodiment 2

[0027] The leaching solution obtained by sulfate leaching of southern ionic rare earth ores is enriched by precipitation and enrichment with sodium hydroxide to obtain rare earth hydroxides containing 10wt.% of sulfate radicals, and the rare earth hydroxides are added to the malic acid solution. The molar mass is 1.5 times the molar mass of the sulfate radical in the rare earth hydroxide, and the liquid-solid ratio of the malic acid solution and the rare earth hydroxide is 1L / kg, and the pH of the coordination solution is controlled by sodium hydroxide solution to be 8.0. o Stir at C for 100 min. Solid-liquid separation then, the solid obtained carries out washing, stops washing when sulfate radical is less than 9ppm in washing filtrate; At 100 o C was dried for 12 hours to finally obtain a rare earth hydroxide with a sulfate content of 0.44wt.%.

Embodiment 3

[0029]Add lanthanum cerium hydroxide containing 1wt.% sulfate radical to the solution containing lactic acid and glycolic acid, the sum of the molar weights of lactic acid and glycolic acid (1:1) in the solution is 2 of the molar weight of sulfate radical in lanthanum cerium hydroxide times, and the liquid-solid ratio of the solution and lanthanum cerium hydroxide is 3L / kg, using sodium hydroxide solution to control the pH of the coordination solution to be 9.0, at 40 o Stirring at C for 40 min. Solid-liquid separation then, the solid obtained carries out washing, stops washing when sulfate radical is less than 9ppm in washing filtrate; At 100 o C was dried for 12 hours to finally obtain lanthanum cerium hydroxide with a sulfate content of 0.23wt.%.

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Abstract

The invention discloses a method for reducing the content of sulfate radicals in rare earth hydrate. The method comprises the following steps: adding sulfate radical-containing rare earth hydrate into a coordination solution containing one or more organic matters in malic acid, acetylacetone, lactic acid, acetic acid, butanedioic acid, glycolic acid and malonic acid, wherein the pH value of the coordination solution is 7-10; and then performing solid-liquid separation, water-washing and drying to obtain rare earth hydrate with the sulfate radical content less than 0.5%. According to the method, sulfate ions are removed with a method for competitive coordination with sulfate radicals; a process is simple and easy to control; a desulfurization effect is remarkable; and the organic matters entering rare earth hydrate can be removed in a roasting manner, so that the purity of a rare earth oxide product is not influenced finally.

Description

technical field [0001] The invention relates to the field of rare earth hydrometallurgy, in particular to a method for reducing the content of sulfate radicals in rare earth hydroxides. Background technique [0002] 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, and catalytic properties. Functional properties, known as "the vitamin of modern industry" and "treasure house of new materials". Among them, rare earth oxides are an important class of rare earth compounds. They are also the main raw materials for the preparation of other rare earth compounds, and are widely used in the preparation of rare earth magnetic materials, luminescent materials, hydrogen storage materials, crystal materials, catalytic materials and other high-tech materials. . [0003] Rare earth hydroxides are importa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F17/00C22B59/00
CPCC01F17/206C01P2006/80C22B59/00
Inventor 肖燕飞徐志峰万章豪廖家隆倪志聪
Owner JIANGXI UNIV OF SCI & TECH
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