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Rare earth sulfate salt and preparation method thereof

A rare-earth sulfuric acid and sulfuric acid solution technology is applied in the direction of rare-earth metal sulfate, rare-earth metal compounds, chemical instruments and methods, etc. It can solve the problems of poor water solubility of ceric sulfate, high acid-soluble acidity, and equipment corrosion. Low cost, low acid solubility and low corrosion of equipment

Active Publication Date: 2016-03-16
YIYANG HONGYUAN RARE EARTH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation method has high acid solubility and high residual acid, which is corrosive to equipment, and the water solubility of ceric sulfate prepared by this process is not good, and the yield is low and the cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A rare earth sulfate salt, the appearance is powdery odorless crystal, the chemical formula is RE 2 (SO 4 ) 3 .nH 2 0, n is 3-9 at room temperature, soluble in water and acid, the solution is clear, the solubility in water decreases with the increase of temperature, and the solubility in sulfuric acid solution decreases with the increase of acidity.

[0019] A preparation method of rare earth sulfate salt, it comprises the following steps:

[0020] ⑴ Prepare a sulfuric acid solution with a concentration of 0.5mol / L to 2.0mol / L in an enamel reaction tank, and cool it to 30°C to 35°C; slowly add the rare earth carbonate salt into the prepared sulfuric acid solution for acid dissolution, and the dissolution temperature is 30°C ~70°C to obtain a rare earth sulfate solution until the pH value of the solution is 3.5~4.0;

[0021] (2) Filter and remove impurities from the rare earth sulfate solution obtained in step (1) to obtain a clear rare earth sulfate solution, and ad...

Embodiment 2

[0028] A rare earth sulfate salt, the appearance is powdery odorless crystal, the chemical formula is RE 2 (SO 4 ) 3 .nH 2 0, n is less than 0.5 at room temperature, soluble in water and acid, the solution is clear, the solubility in water decreases with the increase of temperature, and the solubility in sulfuric acid solution decreases with the increase of acidity.

[0029] In step (5), the rare earth sulfate salt containing 3 to 9 crystal waters is baked at a temperature of 150° C. to 260° C. to obtain anhydrous rare earth sulfate salt.

[0030] RE 2 (SO 4 ) 3 .nH 2 0→RE 2 (SO 4 ) 3 +nH 2 0(150℃~260℃)

[0031] The anhydrous rare earth sulfate salt prepared in this example is thermally decomposed, and the decomposition temperature and time are controlled to obtain basic rare earth sulfate salt or rare earth oxide that is insoluble in water.

[0032] RE 2 (SO 4 ) 3 →RE 2 o 2 SO 4 +2SO 2 ↑+0 2 ↑(855℃~946℃)

[0033] RE 2 o 2 SO 4 →RE 2 o 3 +SO 2 ↑+1 / 20...

Embodiment 3

[0039] In step (1) of the present invention, the preferred concentration of the sulfuric acid solution is 1.0mol / L-1.5mol / L.

[0040]In this example, 2000 L of 1.0 mol / L sulfuric acid solution was prepared, cooled to 30°C, and 500 kg of lanthanum carbonate with a TREO of 43.5% was added to the sulfuric acid solution while stirring to dissolve completely, and the dissolution process was controlled at a temperature of 65°C until the pH of the solution was reached. value of 4.0, at this moment, the concentration of rare earth in the solution is 0.61mol / L; filter the solution to remove impurities, adjust the pH value to 2 with dilute sulfuric acid, and obtain 2200L of clear rare earth sulfate solution; stir and heat the clear rare earth sulfate solution to boil, Precipitate the crystal until the rare earth concentration in the mother liquor is 7g / L to obtain 2000L slurry; in order to prevent the crystal from dissolving and improve the direct yield, filter the slurry quickly, rinse ...

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Abstract

The invention discloses a rear-earth salt sulfate with good water solubility prepared through rear-earth salt sulfate. The rear-earth salt sulfate is characterized in that the rear-earth salt sulfate is powder-like odorless crystals in appearance, the chemical formula is RE2(SO4)3.nH2O, the rear-earth salt sulfate is dissolved in water and acid, the solution is clear, the solubility in water is decreased along with the increase of temperature, and the solubility in a sulfuric acid solution is decreased along with the increase of temperature. The preparation method comprises the following steps: adding rear-earth salt sulfate to the sulfuric acid solution for acid solubility, filtering and removing impurities, crystallization, rinsing and dehydration, and baking. The rear-earth salt sulfate is simple in technological process, low in acid soluble acidity, less in spent acid, less in equipment corrosion, free of environmental pollution, high in product yield and low in cost; the prepared rear-earth salt sulfate is good in water solubility.

Description

technical field [0001] The invention relates to a rare earth product and a preparation method, in particular to a rare earth sulfate salt and a preparation method, in particular to a rare earth sulfate salt with good water solubility and a preparation method thereof. Background technique [0002] Rare earth is a group of new functional materials with multiple properties such as electricity, magnetism, light, superconductivity, catalysis, and biology. It is an important foundation for high-tech fields such as information technology, biotechnology, new materials, and new energy technology and national defense construction. At the same time, it also plays an important role in transforming certain traditional industries, such as agriculture, chemical industry, and building materials. Rare earths are widely used, and there are many kinds of functional materials that can use rare earths. A large-scale high-tech industrial group is being formed. It has very broad market prospects a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F17/00
CPCC01F17/282
Inventor 陈月华任萍朱焱许鸽鸣肖勇崔小震
Owner YIYANG HONGYUAN RARE EARTH
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