Effect of Rare-Earth Elements on the Ignition-Proof Behavior of Industrial Pure Magnesium

2010 ◽  
Vol 654-656 ◽  
pp. 1464-1467 ◽  
Author(s):  
Wei Min Zhao ◽  
Zhong Fang Shi ◽  
Zhi Feng Wang ◽  
Yong Yan Li ◽  
Jian Ding ◽  
...  
Keyword(s):  
Rare Earth ◽  
Oxide Film ◽  
Rare Earth Elements ◽  
Xrd Analysis ◽  
Sem Analysis ◽  
Pure Magnesium ◽  
Film Analysis ◽  
Ignition Point ◽  
Point Test

The purpose of this research is to investigate effect of rare-earth elements (Y and Dy) on industrial pure Mg through the ignition point test and oxide film analysis. The results show that the 0.5%Y can make the ignition point of pure magnesium about 30°C higher. However, the ignition point of pure magnesium can be multiplied about 50°C by the mixed additions of 0.5wt%Y and 5wt%Dy. The SEM analysis indicates the oxide film of Mg-0.5Y-5Dy is more compact and tenacious than that of Mg-0.5Y. The XRD analysis indicates that the oxide film of Mg-0.5Y-5Dy consists of MgO, Y2O3 and Dy2O3. The most of all the three oxides are Dy2O3, which can prevent magnesium from further oxidizing.

Effect of Re Addition on the Ignition Resistance of Pure Magnesium

2014 ◽  
Vol 788 ◽  
pp. 88-92 ◽  
Author(s):  
Jian Ding ◽  
Zheng Fang ◽  
Lin Qin ◽  
Wei Min Zhao
Keyword(s):  
Rare Earth ◽  
Magnesium Alloy ◽  
Oxide Film ◽  
Rare Earth Elements ◽  
Oxidation Resistance ◽  
Rare Earth Oxide ◽  
Pure Magnesium ◽  
Ignition Point ◽  
The Rare Earth

This paper focus on the effect of rare earth elements addition on the oxidation resistance of pure magnesium. The results show that the ignition points of the Mg-RE alloys vary like “V” along with the increase of the rare earth elements. When the content of Y reaches 10wt%, the ignition point of magnesium alloy is 890K, about 40K higher than the ignition point of pure magnesium. After the addition of rare earth elements, dense oxide film forms on the surface of Mg-RE alloys. The outer oxidation film mainly consists of rare earth oxide.

scholarly journals Selective Extraction of Red Phosphor (Y2O3:Eu3+) Constituents from Waste Fluorescent Lamps Phosphor Using Acid Leaching

2018 ◽  
Vol 15 (3) ◽  
Author(s):  
Parul Johar ◽  
Vishal Jangir ◽  
Yogita Choudhary ◽  
Sudhanshu Mallick
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Acid Leaching ◽  
Xrd Analysis ◽  
Selective Extraction ◽  
Phosphor Powder ◽  
Red Phosphor ◽  
Fluorescent Lamps ◽  
Refinement Method ◽  
Lamp Phosphor

Modern fluorescent lamp phosphor powder contains tricolor phosphor. This tricolor phosphor consists of three different types of rare earth phosphors: red (YOX), green (CMAT/LAP) and blue (BAM); mixed in varying proportions. The exact separation of these three rare earth phosphors is essential in order to precisely recover the contained rare earth elements from waste lamps phosphor. In this present work, we reported an efficient methodology for the separation of these three tricolor phosphors and the selective extraction of predominantly presented red phosphor (YOX) constituents using acid leaching. The waste phosphor powder was leached with different acids: both organic and inorganic type. The 3 M H2SO4 leaching was found to be most suitable for the selective extraction of red phosphor constituents, i.e. Y and Eu. The recovered phosphor powder was analyzed with SEM/EDS and XRD analysis. The obtained XRD pattern was refined using Rietveld refinement method for the quantification of phases present. Recovered red phosphor powder contained three main crystalline phases Y2O3, Eu2O3 and Y2OS2. KEYWORDS: Waste Lamp Phosphor; Tricolor Phosphor; Rare Earth Elements; Acid Leaching

scholarly journals KARAKTERISASI MINERAL IKUTAN TIMAH PADA ENDAPAN PRIMER, SEKUNDER, DAN TAILING DI BANGKA SELATAN DAN BELITUNG

2020 ◽  
Vol 1 (1) ◽  
pp. 807-816
Author(s):  
Syafrizal Syafrizal ◽  
Ahmad FauSatyogroho Dian Amerthozi ◽  
Ichwan Azward ◽  
Teti Indriati ◽  
Amrita Oza Nabilla ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
New Technologies ◽  
Economic Value ◽  
Xrd Analysis ◽  
Sample Volume ◽  
X Ray Diffraction ◽  
Grab Sampling ◽  
X Ray ◽  
Tin Metal

ABSTRAK Daerah Bangka Belitung termasuk dalam sabuk timah yang merupakan intrusi pluton granit. Selain merupakan pembawa logam timah, diketahui bahwa pada batuan granit juga merupakan batuan beku pembawa mineral-mineral Rare Earth Elements (REE) seperti monasit, dan xenotim. REE memiliki nilai ekonomis yang tinggi dan peran penting dalam perkembangan teknologi baru. Penelitian ini bertujuan untuk mengetahui kelimpahan kadar, mineralogi dan ukuran butir Mineral Ikutan Timah (MIT) pada endapan primer, sekunder, dan tailing di Bangka Selatan dan Belitung. Pengambilan sampel dilakukan secara acak (grab sampling) untuk sampel endapan aluvial, koluvial, tailing, serta konsentrat dan chip sampling untuk sampel endapan primer berbentuk batuan. Sampel dikeringkan menggunakan oven, kemudian direduksi menggunakan splitter hingga memperoleh volume sampel yang sesuai. Pengayakan sampel dilakukan menggunakan 5 (lima) fraksi yaitu #+48, #+65, #+100, #+150, dan #-150 untuk memperoleh keseragaman butir sampel. Metoda analisis yang digunakan dalam penelitian ini adalah analisa radioaktif menggunakan scintillometer, mineral butir menggunakan metode grain counting, analisa mineragrafi dengan sayatan poles, serta analisa X-Ray Diffraction (XRD) berupa sampel bubuk. Kata kunci : Mineral Ikutan Timah,  Rare Earth Elements, Grain Counting, Monasit, Xenotim.   ABSTRACT The Bangka Belitung area is included in a tin belt which is an intrusion of granite pluton. Besides being a tin metal carrier, it is known that in granite rocks is also igneous rock carrying minerals Rare Earth Elements (REE) such as monasite, and xenotime. REE has high economic value and an important role in the development of new technologies. This study aims to determine the radioactive value, abundance of levels, mineralogy and size of associated tin minerals in primary, secondary and tailings deposits in South Bangka and Belitung. Sampling was carried out by grab sampling for alluvial, colluvial, tailing sediment samples, as well as concentrates and sampling chips for rock sediments. Sampling method by Random Sampling. The samples were dried using an oven, then reduced using a splitter to obtain the appropriate sample volume. Sifting the sample was carried out using 5 fractions namely #+48, #+65, #+100, #+150, and #-150 to obtain uniformity of sample items. Radioactive analysis using scintillometers, grain minerals using the grain counting method, mineragraphy analysis with polish incisions, and X-Ray Diffraction (XRD) analysis in the form of powder samples.  Kata kunci : Mineral Ikutan Timah,  Rare Earth Elements, Grain Counting, Monasit, Xenotim.

The Electrochemical and Immersion Corrosion of Casting Magnesium Alloys Containing Rare Earth Elements

2015 ◽  
Vol 227 ◽  
pp. 79-82
Author(s):  
Andrzej Kiełbus ◽  
Joanna Michalska ◽  
Bartłomiej Dybowski
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Magnesium Alloys ◽  
Electrochemical Corrosion ◽  
Immersion Test ◽  
Pure Magnesium ◽  
Casting Alloys ◽  
Lack Of Information ◽  
Yttrium Addition ◽  
Magnesium Casting

<p>Magnesium alloys are widely used mainly in automotive and aerospace industries. There is quite a lot of information about corrosion of the magnesium alloys in available literature. However, the publications concern mainly Mg-Al alloys, while there is a lack of information about Mg-RE-Zr alloys. The following paper presents results of the investigations on the electrochemical corrosion of magnesium casting alloys containing rare earth elements (WE43, WE54, EV31A-Elektron 21) as well as pure magnesium. The alloys were investigated by immersion test in 3.5% NaCl for times up to 7 days. Electrochemical investigations were carried out at ambient temperature in aerated NaCl solution, using potentiodynamic polarization method. It has been shown that the best corrosion resistance is exhibited by alloys with yttrium addition (WE43, WE54), while the weakest by pure magnesium. EV31A alloy exhibits the highest corrosion rate during the immersion test, while WE54 and WE43 alloys had a similar corrosion behavior.</p>

Flame spectra of the rare-earth elements*

1962 ◽  
Vol 18 (4) ◽  
pp. 1127-1153
Author(s):  
V FASSEL ◽  
R CURRY ◽  
R KNISELEY
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
The Rare Earth
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