Rare-earth salt sulfate and preparation method thereof

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

Active Publication Date: 2015-03-25
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 sulphate salt with the appearance of powdered odorless crystals and the chemical formula RE 2 (SO 4 ) 3 .nH 2 0, n is 3 to 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, which comprises the following steps:

[0020] (1) Prepare a sulfuric acid solution with a concentration of 0.5mol / L~2.0mol / L in an enamel reaction tank, and cool it to 30℃~35℃; slowly add rare earth carbonate to the prepared sulfuric acid solution for acid dissolution, and the dissolution temperature is 30℃ ~70°C, to obtain a rare earth sulfate solution, the pH value of the solution is 3.5-4.0;

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

Embodiment 2

[0028] A rare earth sulphate salt with the appearance of powdered odorless crystals and the chemical formula 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 decomposed by heat, 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 ...

Embodiment 3

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

[0040]In this example, 2000 L of a 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. At this time, 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 crystals until the rare earth concentration in the mother liquor is 7g / L to obtain 2000L slurry; in order to prevent the crystals from dissolving and improve the direct yield, the slurry is quickly filtered, rinsed with near-boiling deionized water, and vacuum filtered to obtain sulfuric acid Lanthanum, the filtrate is precipit...

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PUM

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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 prepared by rare earth carbonate and a preparation method. Background technique [0002] Rare earths are a group of new functional materials with electrical, magnetic, optical, superconductivity, catalysis and biological properties at the same time. At the same time, it also plays an important role in transforming some traditional industries, such as agriculture, chemical industry, building materials and so on. Rare earths have a wide range of uses, and there are many kinds of functional materials that can use rare earths. A large-scale high-tech industry group is being formed, with very broad market prospects and extremely important strategic significance. It has the reputation of "industrial vitamins". Rare earth sulfate is mainly used in pre...

Claims

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Application Information

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Patent Type & Authority Applications(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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