scholarly journals Effect of Depressants and Temperature on Bastnaesite and Monazite Flotation Separation from a Canadian Rare Earth Element (REE) Ore

Minerals ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 225 ◽  
Author(s):  
Jean-Francois Boulanger ◽  
Claude Bazin ◽  
Keven Turgeon
Keyword(s):  
Rare Earth ◽  
Sodium Silicate ◽  
Rare Earth Element ◽  
Earth Element ◽  
Guar Gum ◽  
Effect Of Temperature ◽  
Gangue Mineral ◽  
Lower Grade ◽  
Optimal Separation ◽  
The Impact

A full factorial experimental design was conducted to investigate the effect of temperature and depressants on the flotation of monazite and bastnaesite from carbonate gangue minerals. Temperature, sodium silicate, and guar gum dosage were examined. Mineral reconstruction from energy-dispersive x-ray fluorescence (EDXRF) data was performed to quantify bastnaesite, monazite, and gangue mineral recoveries. Bastnaesite and monazite both follow first-order rates of recovery, with bastnaesite recovering faster and to a larger extent than monazite. The main gangue minerals were depressed together. Optimal separation efficiency was achieved using a larger Na2SiO3 dosage (2400 g/t), no guar gum addition, and a high temperature (75 °C). The rate of bastnaesite recovery increased with the temperature, while sodium silicate improved the ultimate recovery. An economic analysis was performed to evaluate the impact of increasing Rare Earth Element (REE) recovery by allowing a lower grade concentrate to be generated. Despite the high value of REEs, increasing recovery by producing a concentrate bearing more than 68 wt % carbonaceous gangue was uneconomical.

Contributions of Rare Earth Element (La,Ce) Addition to the Impact Toughness of Low Carbon Cast Niobium Microalloyed Steels

2018 ◽  
Vol 24 (4) ◽  
pp. 773-788 ◽  
Author(s):  
Hadi Torkamani ◽  
Shahram Raygan ◽  
Carlos Garcia Mateo ◽  
Jafar Rassizadehghani ◽  
Yahya Palizdar ◽  
...  
Keyword(s):  
Rare Earth ◽  
Impact Toughness ◽  
Rare Earth Element ◽  
Earth Element ◽  
Microalloyed Steels ◽  
Low Carbon ◽  
The Impact

The impact of redox conditions on the rare earth element signature of redoximorphic features in a soil sequence developed from limestone

Geoderma ◽  
2012 ◽  
Vol 170 ◽  
pp. 25-38 ◽  
Author(s):  
Cédric Laveuf ◽  
Sophie Cornu ◽  
Luiz Roberto G. Guilherme ◽  
Annie Guerin ◽  
Farid Juillot
Keyword(s):  
Rare Earth ◽  
Rare Earth Element ◽  
Earth Element ◽  
Redox Conditions ◽  
Redoximorphic Features ◽  
The Impact ◽  
The Rare Earth

scholarly journals Economic potential assessment of rare earth extraction sequence based on rule-based framework

2018 ◽  
Vol 12 (4) ◽  
pp. 4263-4274
Author(s):  
M. Y. M. Yunus ◽  
N. A. Ismail ◽  
B. A. Aziz
Keyword(s):  
Rare Earth ◽  
Rare Earth Element ◽  
Separation Factor ◽  
Earth Element ◽  
Hybrid Approach ◽  
Economic Potential ◽  
Heavy Rare Earth Element ◽  
Rule Based ◽  
Optimal Separation

Rare Earth Element (REE) is a unique group of metals which mainly comprises seventeen (17) elements, which fifteen (15) elements from the lanthanides group plus Scandium and Yttrium. This REE can be divided into heavy rare earth element (HREE) and light rare earth element (LREE) categories. During the initial extraction stage, the LREE is separated from HREE of the original ore and the sub-separations are then conducted subsequently corresponding to the respective categories. However, the separation difficulty becomes rather critical in a certain context, whenever the HREE is the major element to be extracted relative to LREE. In addition, there are no systematic guidelines procedures available to determine which specific separation pathway is more economically feasible among the various extraction options that exist. Thus, this study proposes a systematic quantitative rule-based framework, by excel modelling, in assessing comprehensively the economic potential of any separation model of REE processing that considered, whereby the standard characterization of monazite mineral composition is utilized as the main case study. This work also adopts the separation factor value of HDEHP-HCL as well as EHEHPA-HCL as the main extraction platforms. The findings suggest that the former extractant is effective for the extraction of light REE (LREE), while the latter incline to prefer the medium and heavy REE (MREE and HREE) particularly on the ground of separation stages factor. In light of the initial results, this study also proposes a hybrid approach in performing the complete optimal REE separation that specifically based on the sequence of ‘Art versus Science’ (AvsS) structure. These results have demonstrated that the proposed quantitative rule-based framework able to determine the optimal separation pathway provided the complete separation factor values and the mineral characterization of REE are available for assessment. Thus, this new method is suitably applied as a tool or guidelines in the feasibility study of any processing design for REE separation.

scholarly journals Numerical Modeling of REE Fractionation Patterns in Fluorapatite from the Olympic Dam Deposit (South Australia)

Minerals ◽  
2018 ◽  
Vol 8 (8) ◽  
pp. 342 ◽  
Author(s):  
Sasha Krneta ◽  
Cristiana Ciobanu ◽  
Nigel Cook ◽  
Kathy Ehrig
Keyword(s):  
Numerical Modeling ◽  
Rare Earth ◽  
Rare Earth Element ◽  
Earth Element ◽  
South Australia ◽  
Fluid Composition ◽  
Chloride Complexes ◽  
Copper Gold ◽  
The Impact ◽  
Olympic Dam

Trace element signatures in apatite are used to study hydrothermal processes due to the ability of this mineral to chemically record and preserve the impact of individual hydrothermal events. Interpretation of rare earth element (REE)-signatures in hydrothermal apatite can be complex due to not only evolving fO2, fS2 and fluid composition, but also to variety of different REE-complexes (Cl-, F-, P-, SO4, CO3, oxide, OH− etc.) in hydrothermal fluid, and the significant differences in solubility and stability that these complexes exhibit. This contribution applies numerical modeling to evolving REE-signatures in apatite within the Olympic Dam iron-oxide-copper-gold deposit, South Australia with the aim of constraining fluid evolution. The REE-signatures of three unique types of apatite from hydrothermal assemblages that crystallized under partially constrained conditions have been numerically modeled, and the partitioning coefficients between apatite and fluid calculated in each case. Results of these calculations replicate the measured data well and show a transition from early light rare earth element (LREE)- to later middle rare earth element (MREE)-enriched apatite, which can be achieved by an evolution in the proportions of different REE-complexes. Modeling also efficiently explains the switch from REE-signatures with negative to positive Eu-anomalies. REE transport in hydrothermal fluids at Olympic Dam is attributed to REE–chloride complexes, thus explaining both the LREE-enriched character of the deposit and the relatively LREE-depleted nature of later generations of apatite. REE deposition may, however, have been induced by a weakening of REE–Cl activity and subsequent REE complexation with fluoride species. The conspicuous positive Eu-anomalies displayed by later apatite with are attributed to crystallization from high pH fluids characterized by the presence of Eu3+ species.

scholarly journals The impact of transport processes on rare earth element patterns in marine authigenic and biogenic phosphates

2017 ◽  
Vol 203 ◽  
pp. 140-156 ◽  
Author(s):  
Gerald Auer ◽  
Markus Reuter ◽  
Christoph A. Hauzenberger ◽  
Werner E. Piller
Keyword(s):  
Rare Earth ◽  
Rare Earth Element ◽  
Earth Element ◽  
Transport Processes ◽  
The Impact

Rare Earth Element Partitioning Between Fluids and Uraninite At 50−700 °C

2020 ◽  
Author(s):  
Brandi M. Shabaga ◽  
Mostafa Fayek ◽  
Alysha McNeil ◽  
Robert L. Linnen ◽  
Eric G. Potter
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Rare Earth Element ◽  
Earth Element ◽  
Ore Deposits ◽  
Element Concentrations ◽  
Rare Earth Element Concentration ◽  
Reducing Conditions ◽  
Element Partitioning ◽  
The Impact

ABSTRACT Uranium deposits are globally diverse, occurring in a wide variety of geological settings and ranging in age from Archean to Holocene. As a result, understanding the mechanisms involved in the genesis and subsequent alteration of these complex deposits is challenging. Building on recent work on the geochemical signatures of uraninite, a series of experiments were designed to document the partitioning of rare earth elements between uraninite and fluids over a range of temperatures and to explore the impact of O and H diffusion, under reducing conditions, on U-Pb isotope systematics and rare earth element concentrations in uraninite. Our results show that O and H diffusion in the presence of a rare earth element-rich fluid, under reducing conditions, has no effect on rare earth element concentrations and patterns or U-Pb isotopic compositions of uraninite. Our results also show that temperature (300 to 700 °C) has no effect on the rare earth element patterns, indicating that the dominant control on rare earth element concentration in uraninite is the metal source(s), the ability of the fluids to transport rare earth elements without inducing fractionation, and the degree of recrystallization. These results have implications for nuclear forensics, as well as for our understanding of the genesis of uranium-bearing ore deposits.

scholarly journals Influence of rare earth addition on the properties of AA6351 hybrid composites

2021 ◽  
Vol 9 (4B) ◽  
Author(s):  
Gaurav Arora ◽  
◽  
Satpal Sharma ◽  
Keyword(s):  
Silicon Carbide ◽  
Rare Earth ◽  
Rare Earth Element ◽  
Rice Husk ◽  
Earth Element ◽  
Rice Husk Ash ◽  
Hybrid Composites ◽  
Praseodymium Oxide ◽  
Rare Earth Addition ◽  
The Impact

Nowadays, the effect of the rare earth addition on the performance of aluminium matrix composites is a major interest for many researchers. The present research work emphasis is on the study of the effect of praseodymium oxide (rare earth element) addition on the performance of AA6351 hybrid composites. Silicon carbide and rice husk ash in the weight proportions of 6:2 were ball-milled with various weight percentages (0.4%, 0.8%, and 1.2%) of praseodymium oxide to have a consistent microstructure and combined density equivalent to the AA6351 matrix alloy. Further, AA6351 hybrid composites with the ball-milled reinforcement of silicon carbide, rice husk ash, and praseodymium oxide were produced using stir-casting technique. Physical, microstructural, mechanical, and tribological characterization were done to study the impact of praseodymium oxide addition on the developed hybrid composites. An increment of 2.61% in the density, 49.40% in the microhardness, and 19.78% in the ultimate tensile strength was recorded with the incorporation of 1.2 weight percentage of praseodymium oxide in the AA6351 hybrid composites. The wear rate of the developed composites also improved by 32.92% with the addition of praseodymium oxide. The results exhibited a remarkable improvement in the performance of the AA6351 hybrid composites with the addition of rare earth element.

Sign in / Sign up

Export Citation Format

Share Document