Praseodymium oxide (Pr6O11) is an inorganic compound that can be used in glass, metallurgy, and as a phosphor additive. 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, etc. The prospects are still promising.
Praseodymium oxide is a black powder with a density of 6.88 g/cm3, a melting point of 2042℃, and a boiling point of 3760℃. This substance is insoluble in water, soluble in acid to form trivalent salts, and has good conductivity.
1. Chemical separation. It mainly includes three kinds of step crystallization method, step precipitation method and oxidation method. The former is separated based on the difference in crystal solubility of rare earth nitrate. The former is separated based on the difference in precipitation capacity product of the rare earth sulfate double salt. The latter is separated based on the oxidation of trivalent Pr3+ to tetravalent Pr4+. These three methods have not been applied in industrial production due to low recovery rate of rare earth, complicated process, difficult operation, small output and high cost.
2. Separation method. Including complex extraction separation method and saponification P-507 extraction separation method. The former uses complex extrusion DYPA and N-263 extractant to extract and separate praseodymium in the nitric acid system of praseodymium neodymium enrichment, which can obtain 99% Pr6O11, and the yield is 98%. However, due to the complicated process, the consumption of complexing agent is too high, and the product cost is high, which is not used by industrial production. The latter two have better extraction and separation of praseodymium and are used in industrial production, but because of the high efficiency of P-507 extraction and the high loss rate of P-204, P-507 extraction and separation methods are currently used in industrial production. .
3. Ion exchange method, which has a long process, troublesome operation and low yield and is rarely used in production, but the product purity is Pr6O11 ≥ 99.5%, the yield is ≥ 85%, and the output per unit of equipment is low.
1. Application in rare earth glass
After adding rare earth oxides to glass with different compositions, different colors of rare earth glass can be made. After adding praseodymium oxide to the glass, it can be made into green color glass, which has high-quality artistic value and can be used to imitate gemstones. This glass looks like green under normal sunlight, but is almost colorless under candlelight. Therefore, it can be used to make fake gemstones and precious ornaments with attractive color and love.
2. Application in rare earth ceramics
Rare earth oxides are used as additives for ceramics and can be made into many rare earth ceramics with better performance. Among them, rare earth fine ceramics are representative. It uses highly selected raw materials, adopts easy-to-control technology and processing technology, and can accurately control the composition of ceramics. It can be divided into functional ceramics and high-temperature structural ceramics. After they are added with rare earth oxides, they can improve the sinterability, compactness, microtexture and phase composition of ceramics to meet the requirements of different applications. The ceramic glaze made of praseodymium oxide colorant is not affected by the atmosphere in the kiln, and has stable color and bright glaze. It can improve the physical and chemical properties, improve the thermal stability and quality of the ceramic, and increase the variety of colors.
3. Application in other fields
On the basis of white corundum, adding about 0.25% of praseodymium neodymium oxide can make a rare earth corundum grinding wheel, and its grinding performance is greatly improved. Increase the grinding rate by 30% to 100% and double the service life. Praseodymium oxide has good polishing properties for certain materials, so it can be used as a polishing material for polishing operations. It contains about 7.5% of praseodymium oxide in cerium-based polishing powder. It is mainly used for optical glasses, metal products, flat glass and televisions. Picture tube polishing. In addition, the application of petroleum cracking catalysts can improve catalytic activity, can be used as additives for steelmaking, and purify molten steel. In short, the application of praseodymium oxide is constantly expanding.
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