High-purity light lanthanum carbonate or lanthanum oxide and preparation method thereof

Abstract

The invention discloses high-purity light lanthanum carbonate or lanthanum oxide and a preparation method thereof. The production method at least comprises the following steps: S1, hydrolyzing lanthanum oxide powder and deionized water to prepare a lanthanum hydroxide slurry; S2, introducing carbon dioxide gas into the lanthanum hydroxide slurry obtained in the step S1, and carrying out a carbonization reaction to obtain a lanthanum carbonate slurry; S3, filtering and drying the lanthanum carbonate slurry obtained in the step S2 to obtain high-purity light lanthanum carbonate; and S4, roastingthe high-purity light lanthanum carbonate obtained in the step S3 to obtain the high-purity light lanthanum oxide. The lanthanum oxide produced by the method is ultrahigh in purity, extremely low inimpurity content and small in apparent density, and can be well applied to high-tech materials such as rare earth magnetic materials, luminescent materials, hydrogen storage materials, crystal materials, catalytic materials and the like.

Description

technical field [0001] The invention belongs to the field of high-purity material preparation, and in particular relates to a high-purity light lanthanum carbonate or lanthanum oxide and a preparation method thereof. Background technique [0002] Rare earth oxides are the key basic materials for the preparation of rare earth magnetic materials, luminescent materials, hydrogen storage materials, crystal materials, catalytic materials and other high-tech materials. With the continuous expansion of rare earth application fields and levels, high-tech materials have higher and higher requirements for the quality of rare earth oxides, and they are shifting to a way of controlling physical properties such as particle size, purity, morphology, and specific surface area. [0003] As one of the important rare earth oxides, lanthanum oxide has a strong ability to gain and lose electrons, and is prone to oxidation or reduction reactions. It has been widely used in catalysts, luminescent...

AI Technical Summary

Problems solved by technology

[0009] These existing precipitation methods all inevitably introduce impurity ions such as chloride, sulfate and / or nitrate in lanthanum oxide, which reduces the purity of the product, and are easy to agglomerate and difficult to filter, resulting in product (lanthanum hydroxide / Lanthanum carbonate) is difficult to wash and filter, and it is easy to filter and cause losses; at the same time, a large amount of ammonia nitrogen wastewater is produced, resulting in the discharge of sediment wastewater up to standard and increasing the operating cost of the enterprise

[0010] In addition, other common methods in the prior art, such as vacuum condensation method, vapor deposition method, sol-gel method, etc., can obtain high-purity materials with clean surface, neat and controllable particle size, and good dispersibility, but they all exist. High investment, complex process, difficult process control, and often need to use dispersant, organic complexing agent, polymer protective agent, etc. in the preparation process to increase the cost of raw materials

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