Method for preparing cerium oxide with rare earth cerium chloride

Abstract

The invention relates to a method for preparing cerium oxide with rare earth cerium chloride and belongs to the technical field of rare earth oxide preparation. The method comprises the steps of dissolving rare earth cerium chloride into water to form a solution with the concentration of 2-95g / L, then adding a dispersing agent of 0.3-5% of volume percentage of the solution, atomizing a mixed solution into drops, injecting from the top of a microwave reactor, supplying oxidizing gas from the bottom, carrying out microwave pyrolysis reaction at negative pressure of 100-10000Pa to form cerium oxide and exhaust gas, and obtaining technical hydrochloric acid after dust collection and absorption of the exhaust gas. The method adopts a microwave pyrolysis and solution atomization technology, the pyrolysis reaction time is very short, the quick pyrolysis is achieved, the generation of a cerium oxychloride byproduct in a rare earth cerium oxide preparation process by a rare earth cerium chloride solution roasting pyrolysis method, and the pyrolysis conversion rate and purity of rare earth cerium oxide are increased.

Description

technical field [0001] The invention relates to a method for preparing cerium oxide from rare earth cerium chloride, which belongs to the technical field of rare earth oxide preparation. Background technique [0002] Rare earth oxides have special optical, electrical, magnetic and electrical properties, and can be used to prepare a variety of new materials with different functions and excellent performance, especially in optics, polishing and grinding, catalysis, magnetism, ceramics, chemical industry, biological It has a wide range of applications in medicine and other fields. The production of ultrafine and uniform rare earth oxides has broad application range and market prospect. [0003] At present, the preparation methods of rare earth oxides include precipitation method, sol-gel method, hydrothermal synthesis method, microemulsion method and hydrolysis method, etc. Although they meet the requirements of industrial production, these preparation methods fundamentally ha...

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Problems solved by technology

Due to the pyrolysis of the roasting furnace used, the heat transfer is indirect heat transfer, the efficiency is low, the pyrolysis reaction speed is slow, up to 40 minutes, the production cycle is long, and the output is low; the long-term high-temperature roasting solution condenses into a large liquid Dropping will lead to large particle size and uneven size distribution of the powder obtained by pyrolysis, which will affect the quality of rare earth oxides; secondary side reactions will occur during the long-term pyrolysis process, which will reduce the purity of the prepared rare earth oxides

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