Results 181 to 190 of about 5,096 (207)

Froth flotation of monazite and xenotime

Minerals Engineering, 1993
Abstract The flotation of monazite and xenotime using sodium oleate as collector has been investigated using a modified Hallimond tube and also by a technique which measures particle-bubble adhesion strength. The zeta potential of both minerals was also measured.
Ta-Wui Cheng, P.N. Holtham, Tam Tran
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Melting Temperatures of Monazite and Xenotime

Journal of the American Ceramic Society, 1987
The melting temperatures of natural and synthetic monazite and xenotime (rare‐earth ortnophosphates) were measured, using a heliostat‐type solar furnace. The results obtained are as follows: natural monazite from Japan (2057°40°C), synthetic monazite RPO 4 (R=La, 2072°20°C; R=Ce, 2045°20°C; R=
Yasuo Hikichi, Tsuyoshi Nomura
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Actinide valences in xenotime and monazite

Journal of Nuclear Materials, 2011
Abstract Tetravalent U, Np and Pu can be substituted by ceramic methods into the rare earth site of xenotime and monazite in air atmospheres using Ca ions as charge compensators, while no evidence of penta- or hexavalent actinide ions was found. Some Pu3+ and Np3+ can be incorporated in xenotime samples fired in a reducing atmosphere.
E.R. Vance, Y. Zhang, T. McLeod, J. Davis   +3 more
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Apatite, Monazite, and Xenotime in Metamorphic Rocks

Reviews in Mineralogy and Geochemistry, 2002
This chapter focuses on phosphates that are significant in metamorphic rocks. A quick survey of phosphate mineral descriptions at a commercial mineral web-site revealed over 500 phosphate mineral names. Remarkably, only three are common in metamorphic rocks: apatite, monazite, and xenotime, and this chapter is restricted to discussion of these minerals.
F. S. Spear, J. M. Pyle
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Phase transformations in xenotime rare-earth orthophosphates

Acta Materialia, 2013
Abstract Xenotime rare-earth orthophosphates were made with compositions close to the xenotime–monazite phase boundary. Stress-driven phase transformations and their associated deformation mechanisms were characterized for these compositions by extensive conventional and high-resolution transmission electron microscopy.
R.S. Hay, P. Mogilevsky, E. Boakye
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Flotation concentration of a xenotime pre-concentrate

Minerals Engineering, 1997
Abstract The world market for rare-earths elements is increasing due to the development of new products and applications, resulting in the need for technology to treat deposits having highly complex mineralogy, such as that of Pitinga, AM, Brazil, with estimated reserves of 146,960 t of rare-earths oxides (REO), including Y2O3.
C.A. Pereira, A.E.C. Peres
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Microstructural studies and carbochlorination kinetics of xenotime ore

Metallurgical and Materials Transactions B, 2001
In this work, a systematic study of the reaction between xenotime, chlorine, and carbon has been performed. The kinetics of carbochlorination of xenotime raw material (rare-earth elements in phosphate form, REPO4) has been studied over a temperature range from 600 °C to 950 °C. The influences of temperature, partial pressure of chlorine, carbon content,
Marco A. Gimenes, Herenilton P. Oliveira
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Monazite and Xenotime in European Rocks

Mineralogical Magazine and Journal of the Mineralogical Society, 1897
As the phosphates of the cerium and yttrium groups, monazite aud xenotime, have proved to be quite widespread microscopic accessories in certain types of Brazilian granites and gneisses, "a batea test has recently been made on a number of hand specimens obtained from the mineral establishment of Dr. F. Krantz, of Bonn, for the purpose of determining if
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The surface properties and flotation behaviour of xenotime

Minerals Engineering, 1994
Abstract Surface properties and flotation behaviour of xenotime using sodium oleate as a collector have been investigated. Adsorption isotherm and flotation studies in combination with chemical modelling were conducted to investigate the surface properties of xenotime and mechanisms of the interactions of the surface with the collector and the ...
Ta-Wui Cheng, A.C. Partridge, Tam Tran, P.L.M. Wong   +3 more
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Simple method of distinguishing zircon, monazite, and xenotime

Journal of Sedimentary Research, 1963
The absorption spectra of the three minerals can be rapidly and easily obtained and provide a simple method of identification. Other rare earth compounds may also be identified by their spectra.
O. H. Hering, W. Zimmerle
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