scholarly journals The long-term variations of rare earth element contents in Tamagawa hot spring waters, Akita Prefecture, Japan.

2002 ◽  
Vol 63 (2) ◽  
pp. 135-145 ◽  
Author(s):  
Tetsuya SANADA ◽  
Nobuki TAKAMATSU ◽  
Yuzo YOSHIIKE ◽  
Masayuki IMAHASHI ◽  
Hideo HIGUCHI
Keyword(s):  
Rare Earth ◽  
Rare Earth Element ◽  
Earth Element ◽  
Hot Spring ◽  
Akita Prefecture ◽  
Element Contents ◽  
Long Term Variations

scholarly journals The Occurrence States of Rare Earth Elements Bearing Phosphorite Ores and Rare Earth Enrichment Through the Selective Reverse Flotation

Minerals ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 698
Author(s):  
Wenxiang Chen ◽  
Feng Zhou ◽  
Hongquan Wang ◽  
Sen Zhou ◽  
Chunjie Yan
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Rare Earth Element ◽  
Earth Element ◽  
Ion Beam ◽  
Western China ◽  
Reverse Flotation ◽  
Flotation Process ◽  
Element Bearing ◽  
Element Contents

The reserve of rare-earth element-bearing phosphorite ores in Guizhou province in western China is huge. Increased demand for the different products manufactured from rare-earth elements has resulted in an extreme need for reasonable and comprehensive extraction of rare-earth elements. An improved understanding of rare-earth element occurrence states in single minerals of ores is important for their further processing. In this paper, rare-earth element contents were analyzed by inductively coupled plasma (ICP), and the occurrence states in single minerals were further investigated through SEM-EDS and focused ion beam-scanning electron microscope (FIB-SEM) methods. The results indicate that rare-earth element contents of apatite are far more than that of dolomite. No independent mineral of rare-earth elements exists for the studied sample. Rare-earth elements are present in the form of ions in the lattices of apatite. Based on the analysis of occurrence states and properties in single minerals, the distribution of rare-earth elements in the flotation process was investigated by reverse flotation technology. It shows that rare-earth elements are mainly concentrated in apatite concentrate. Under the optimized conditions, the P2O5 grade increases from 11.36% in the raw ore to 26.04% in the concentrate, and the recovery is 81.92%, while the total rare-earth oxide grade increases from 0.09% to 0.21% with the recovery of 80.01%, which is similar to P2O5 recovery. This study presents the feasibility of extracting rare-earth elements from rare-earth element-bearing phosphorite ores through the flotation of apatite.

Influence of the temperature of CO2-rich springs on their aluminium and rare-earth element contents

1988 ◽  
Vol 68 (1-2) ◽  
pp. 57-67 ◽  
Author(s):  
Bernard Sanjuan ◽  
Annie Michard ◽  
Gil Michard
Keyword(s):  
Rare Earth ◽  
Rare Earth Element ◽  
Earth Element ◽  
Element Contents

Rare earth element contents of Jurassic fish and reptile teeth and their potential relation to seawater composition (Anglo-Paris Basin, France and England)

2002 ◽  
Vol 186 (1-2) ◽  
pp. 1-16 ◽  
Author(s):  
Stéphanie Picard ◽  
Christophe Lécuyer ◽  
Jean-Alix Barrat ◽  
Jean-Pierre Garcia ◽  
Gilles Dromart ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Element ◽  
Earth Element ◽  
Paris Basin ◽  
Element Contents

The Effects of Rare Earth Element on the Al-Ti-B Master Alloy Second Phase

2014 ◽  
Vol 574 ◽  
pp. 380-385
Author(s):  
Hua Hu ◽  
Zhi Liu Hu ◽  
Liang Jie Wei ◽  
Jian Bao Yin
Keyword(s):  
Rare Earth ◽  
Rare Earth Element ◽  
Master Alloy ◽  
Mass Fraction ◽  
Earth Element ◽  
Intermediate Phase ◽  
Second Phase ◽  
Second Phase Particles ◽  
Master Alloys

Al-Ti-B-RE master alloy is an efficient long-term new refiner. Al-Ti-B-RE refiner was prepared by Al-Ti-B master alloy doped with LaF3, La-rich RE carbonate and Ce respectively. This paper studies the effect of different type and mass fraction of RE on the Second Phase Particles distributions and shape in Master Alloys. The addition of RE have a certain effect of refining TiAl3 and TiB2 intermediate phase. Moreover, it prevents aggregation of TiB2 intermediate phase. As the different type and addition of RE has an effect on the microstructure of master alloy, then the reasonable addition of RE is put forward.

Rare earth element contents in lower and higher flora from the Bulgarian region of the black sea

1994 ◽  
Vol 46 (4) ◽  
pp. 229-238 ◽  
Author(s):  
T. Denchev ◽  
L. Petrov ◽  
O. GARCIA Martinez ◽  
S. Dimitrova ◽  
D. Vodenicharov
Keyword(s):  
Rare Earth ◽  
Rare Earth Element ◽  
Black Sea ◽  
Earth Element ◽  
The Black Sea ◽  
Element Contents
Sign in / Sign up

Export Citation Format

Share Document