Influence of Non-Ferrous Metals and Rare-Earth Elements on Structural Characteristics of Cr–Mo Steels

2015 ◽  
Vol 7 (4) ◽  
pp. 304-309
Author(s):  
J. Drápala ◽  
Vu The Ha ◽  
S. Brožová ◽  
G. Kostiuková ◽  
P. Machovčák ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Structural Characteristics ◽  
Ferrous Metals ◽  
Non Ferrous Metals

scholarly journals Ecological/economical Assessment of Pit Waters (the Ural Copper Pyrite Watersealed Mines as a Study Case)

2016 ◽  
pp. 52
Author(s):  
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Water Discharge ◽  
Water Bodies ◽  
Raw Material ◽  
Environmental Damage ◽  
Ferrous Metals ◽  
Order Of Magnitude ◽  
Copper Pyrite ◽  
Non Ferrous Metals

Worked-out copper pyrite mines are one of the considerable sources of hydrosphere pollution. Analysis of components of the environmental damage to surface water bodies due to treated pit water discharge has been carried out. Environmental damage to water bodies caused by the Levikha and Degtyarsk mines pit water discharge both during the mines operation and after watersealing of them is assessed in 100–200 million rubles per year? And the value of the prevented environmental damage is one order of magnitude higher. Individual components contribution to environmental damage has been determined: during the mines operation cooper was the main pollutant, after the pumping termination zinc became the main pollutant. It has been stated that pit water is a reliable renewable source of non-ferrous metals and rare earth elements and can be considered a hydro/mineral raw material deposit. Commercial content of non-ferrous metals and rare earth elements in the watersealed copper pyrite mines has been estimated. Total recoverable value of non-ferrous metals and rare earth elements in the Levikha mine pit water exceeds 4 million US dollars per year. Rare earth elements comprise the main share. It has been shown that potential recoverable value of the components exceeds cost of annual neutralization of acidic pit water and the value of environmental damage caused by the treated pit water discharge.

Structural Characteristics of Ductile Iron at Different Rare Earth Contribution from a Magnesium Ferrosilicon Alloy

2014 ◽  
Vol 216 ◽  
pp. 17-22
Author(s):  
Valentin Uta ◽  
Iulian Riposan
Keyword(s):  
Trace Elements ◽  
Rare Earth ◽  
Rare Earth Elements ◽  
High Purity ◽  
Ductile Iron ◽  
Structural Characteristics ◽  
Graphite Morphology ◽  
Nodular Graphite

The structural characteristics of ductile irons were studied using different rare earth elements (REE) in Mg-FeSi treatment alloys (0.005 - 0.025%REEres), in un-inoculated and Ca-bearing FeSi in the mould inoculated irons. In relatively high purity base iron, in terms of anti-nodularising trace elements, (Thielman factor K = 0.7-0.8), increasing REE content after Mg-treatment aggravated the carbides tendency and decreased the nodular graphite compactness, in both un-inoculated and inoculated irons. Graphite parameters improve for lower REE content, and, in both cases, for inoculated irons. A low content of REEres (0.005 to 0.01%) for K < 0.8 is practical and sufficient in a Ca-bearing FeSi alloys inoculated iron to control carbides sensitivity and to sustain acceptable nodular graphite morphology formation.

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

ESTIMATION OF THE ABUNDANCE AND DISTRIBUTION OF RARE EARTH ELEMENTS IN SOIL AROUND KADUNA REFINING AND PETROCHEMICAL COMPANY USING NUCLEAR TECHNIQUE

2020 ◽  
Vol 4 (2) ◽  
pp. 599-604
Author(s):  
Michael A. Onoja ◽  
P. H. Bukar ◽  
C. U. Omeje ◽  
A. M. Adamu
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Nuclear Technique ◽  
Flood Plains ◽  
Economic Exploitation ◽  
Rare Elements ◽  
Petrochemical Company ◽  
The Moment ◽  
Abundance And Distribution ◽  
Natural Pattern

Instrumental neutron activation analysis (INAA) technique was used to investigate the abundance and distribution of rare earth elements (REE) in soil around Kaduna Refinery. The aim of the study is to assess the rare elements potential of Nigeria for economic exploitation. Five REEs (La, Dy, Eu, Yb, and Lu) were detected in varying concentrations ranging from a minimum of 0.6 µg/g (Lu) to a maximum of 249.0 µg/g (La). The elements existed with trends consistent with the natural pattern of REEs in soil, showing significant Eu and Dy anomalies which characterize upper plains and flood plains. The levels of REEs in soil in the study area were generally slightly above background levels, with minimal (La, Dy, and Eu), moderate (Yb), and significant (Lu) enrichments and trending: Lu ˃Yb ˃ Eu ˃ Dy ˃ La. The abundance of the REEs investigated cannot establish a potential of Nigeria for economic exploitation of the mineral, hence, rare earth project in the study area is not viable at the moment.

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