Microwave preparation method of nano rare earth oxide

Abstract

The invention discloses a microwave preparation method of a nano rare earth oxide, wherein the microwave preparation method comprises the following steps: (1) surface treatment: taking a rare earth salt solution, regulating the pH value to be alkaline, and adding a surface assistant to obtain a surface-treated rare earth-containing solution; (2) precipitation reaction: dropwise adding a precipitant into the surface-treated rare earth-containing solution while stirring, and aging, filtering and washing to obtain corresponding rare earth precipitates; and (3) microwave calcination: putting the precipitate into a microwave reactor, and carrying out microwave heating calcination to obtain the nano rare earth oxide powder. According to the invention, the nano rare earth oxide with uniform granularity, consistent morphology and good dispersity is prepared by adopting a microwave heating calcining method and matching with a surface additive.

Description

technical field [0001] The invention relates to the field of rare earths, in particular to a microwave preparation method of nanometer rare earth oxides. Background technique [0002] Praseodymium oxide (Pr 6 o 11 ) is an inorganic compound, the English name is Praseodymium oxide, which can be used in glass, metallurgy, and as a phosphor additive, etc. Praseodymium oxide is one of the important products in light rare earth products. Because of its unique physical and chemical properties, it has been widely used in the fields of ceramics, glass, rare earth permanent magnets, rare earth cracking catalysts, rare earth polishing powders, abrasive materials and additives, and its prospects are still promising. Since the 1990s, my country's praseodymium oxide production technology and equipment have been greatly improved and perfected, and the products and output have increased rapidly. It can not only supply domestic applications and market requirements, but also export a cons...

AI Technical Summary

Problems solved by technology

[0005] At present, the methods for preparing nano-rare earth oxides (praseodymium oxide, or neodymium oxide, or praseodymium neodymium oxide) mostly use precipitation, extraction and separation, and ion exchange methods. Among them, the precipitation method cannot be used due to low rare earth recovery rate, small output, and high cost. It is applied in industrial production, and due to the agglomeration of the particles due to the uneven heating inside and outside of the particles during the high temperature reaction, the prepared praseodymium oxide (or neodymium oxide, or praseodymium neodymium oxide) has a large particle size and different shapes. The heating process is uncontrollable; the extraction and separation method is widely used in industrial production, but it has the disadvantages of cumbersome process, high consumption of extractant and high cost; the ion exchange method has the disadvantages of long preparation process, troublesome operation, low recovery rate of rare earth, low product purity and Disadvantages such as low output