scholarly journals Investigation of the solubility of dust particles in soil solution at different temperatures (on the example of the tailings of the loparite ores' concentration)

Vestnik MGTU ◽  
2021 ◽  
Vol 24 (1) ◽  
pp. 107-117
Author(s):  
V. V. Maksimova ◽  
E. A. Krasavtseva ◽  
V. A. Masloboev ◽  
D. V. Makarov
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Fine Fraction ◽  
Water Extract ◽  
Dust Particles ◽  
Tailing Dump ◽  
Murmansk Region ◽  
Different Temperatures ◽  
Overburden Dumps ◽  
Ore Dressing

A number of large mining enterprises are located on the territory of the Murmansk region. Dusting overburden dumps and tailings storage sites leads to a complex of long-term consequences for the environment. The output of the silty fraction (-0.071 mm) of "stale" tailings of loparite ore dressing (the first field of the tailing dump) is about 22 %. The investigated material is represented by nepheline, microcline, aegirine; loparite, analcime are diagnosed in impurity quantities; the average content of cerium, lanthanum, neodymium - rare earth elements of the light group - 0.18, 0.03 and 0.015 %, respectively. In laboratory conditions, a simulation of the ingress of a fine fraction of loparite ore dressing tailings into the soil has been carried out; the interaction of tailings material with distilled water and water extract from conditionally background soil at different temperatures has been studied. In the course of the study, it has been found that the introduction of dissolved organic matter intensifies the processes of destruction and partial dissolution of the aluminosilicate matrix of rock-forming minerals; an intensive transition of rare earth elements and heavy metals into soluble forms has been recorded. The research results indicate the ecological danger of the finely dispersed material of "stale" tailings of loparite ore dressing due to the ingress of dust particles into the soil and their interaction with soil waters.

On the way to ‘zero waste’ management: Recovery potential of elements, including rare earth elements, from fine fraction of waste

2018 ◽  
Vol 186 ◽  
pp. 81-90 ◽  
Author(s):  
Juris Burlakovs ◽  
Yahya Jani ◽  
Mait Kriipsalu ◽  
Zane Vincevica-Gaile ◽  
Fabio Kaczala ◽  
...  
Keyword(s):  
Rare Earth ◽  
Waste Management ◽  
Rare Earth Elements ◽  
Fine Fraction ◽  
Zero Waste ◽  
Recovery Potential ◽  
The Way

Rare earth elements in fine fraction (<20 μm) of the Vistula River sediments

Chemosphere ◽  
2019 ◽  
Vol 237 ◽  
pp. 124442 ◽  
Author(s):  
Tomasz Kowalkowski ◽  
Marianna Pastuszak ◽  
Albert Szparaga ◽  
Zbigniew Samczyński ◽  
Halina Polkowska-Motrenko ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
River Sediments ◽  
Fine Fraction ◽  
Vistula River

scholarly journals The rare-earth elements distribution in the Bazhenov shales

2019 ◽  
Vol 98 ◽  
pp. 03001
Author(s):  
Ekaterina Kazak ◽  
Natalia Kharitonova ◽  
Yana Sorokoumova
Keyword(s):  
Rare Earth ◽  
Correlation Analysis ◽  
Rare Earth Elements ◽  
Western Siberia ◽  
Water Extract ◽  
Distribution Data ◽  
Bazhenov Formation ◽  
The One ◽  
Rare Earth Elements Distribution ◽  
The Rare Earth

The rare-earth elements and yttrium (REY) distribution data with depth in the Bazhenov formation are given for the case of the one well in the Nizhnevartovsk arch of the Western Siberia, Russian Federation. According to the correlation analysis, it was found that REY (mainly LREE) is concentrated in apatite more than in clays or plagioclase, while HREE is preferably accumulated in clay minerals. It was estimated that the water extracts from the Bazhenov formation contain REY up to 0.014 ppb, while LREE is contained in 3.6 times more than HREE. An attempt to estimate the REY content in the pore water of the Bazhenov formation was made using water extract composition data.

scholarly journals Environmental hazard of loparite ore dressing tailings

2021 ◽  
Vol 247 ◽  
pp. 01044
Author(s):  
EA Krasavtseva ◽  
VV Maksimova ◽  
DV Makarov
Keyword(s):  
Heavy Metals ◽  
Rare Earth ◽  
Rare Earth Elements ◽  
Soil Water ◽  
Atmospheric Precipitation ◽  
Environmental Hazard ◽  
Dust Particles ◽  
Pollutant Concentrations ◽  
Maximum Permissible Concentrations ◽  
Light Group

Mobilization of environmentally hazardous elements from loparite ore tailings when exposed to various leaching agents was studied in laboratory conditions. Leaching of pollutants from fresh tailings when exposed to atmospheric precipitation and the processes of interaction of mature tailings dust particles (-0.071 mm) with soil water were examined. It was found that in both cases, there is an intensive decomposition of the minerals making up the tailings and conversion of heavy metals (Zn, Mn, Sr) and rare earth elements of the light group (La - Sm) into a dissolved, and therefore bioavailable form. At the same time, the pollutant concentrations were many times higher than the maximum permissible concentrations for fishery water bodies. The results of the experiments indicate the environmental hazard associated with loparite ore concentration tailings due to the pollution of environment with heavy metals and rare earth elements released when the tailings interact with rainwater and soil water.

Soluble/insoluble fractionation of elements in mineral dust from Antarctic samples

2020 ◽  
Author(s):  
Elena Di Stefano ◽  
Giovanni Baccolo ◽  
Paolo Gabrielli ◽  
Aja Ellis ◽  
Barbara Delmonte ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Mineral Dust ◽  
Ice Core ◽  
Ice Cores ◽  
Dust Particles ◽  
Aeolian Dust ◽  
The Past ◽  
Icp Ms

&lt;p&gt;Deposition of dust on the Antarctic continent is controlled by many factors, such as the primary supply of dust particles from the continents [1], the long range transport, the hydrological cycle and the snow accumulation rate [2, 3]. Thus, the study of mineral dust in ice cores gives the possibility to reconstruct past climatic and environmental conditions.&lt;/p&gt;&lt;p&gt;Generally, when an ice core sample is melted, soluble elements dissolve in water, while insoluble elements remain in the solid phase. Other elements, such as iron, calcium, potassium and sulfur, typically partition between the soluble and the insoluble fractions. However recent studies have shown how the dust record may be chemically and physically altered in deep ice cores [4, 5], posing a challenge in the interpretation of the climatic signal that may lie within such samples. In particular, relative abundance of specific elements was shown to be different when comparing shallow and deep dust samples, suggesting that post depositional processes are taking place.&lt;/p&gt;&lt;p&gt;In this study we present a comparison between samples belonging to the Talos Dome ice core analyzed through two different techniques: instrumental neutron activation analysis (INAA) and inductively coupled plasma mass spectrometry (ICP-MS). While the former is used to investigate only the insoluble fraction of dust, as it can only be applied to solid samples, the latter is used to assess the elemental composition of both the total and the soluble fraction of dust. We determined 45 elements through ICP-MS and 39 through INAA, with a good overlapping of the elements between the two techniques. Besides the determination of major elements, the high sensibility of both techniques also permitted the determination of trace elements. Among these, rare earth elements (REE) are of particular importance as they have been widely used as a geochemical tracer of aeolian dust sources [6]. We here present depth profiles for each analysed element, covering discrete portions of the entire ice core.&lt;/p&gt;&lt;p&gt;&amp;#160;&lt;/p&gt;&lt;p&gt;Bibliography&lt;/p&gt;&lt;p&gt;[1] Petit, Jean-Robert, et al. &quot;Climate and atmospheric history of the past 420,000 years from the Vostok ice core, Antarctica.&quot; Nature 399.6735 (1999): 429-436.&lt;/p&gt;&lt;p&gt;[2] Lambert, Fabrice, et al. &quot;Dust-climate couplings over the past 800,000 years from the EPICA Dome C ice core.&quot; Nature 452.7187 (2008): 616.&lt;/p&gt;&lt;p&gt;[3] Wegner, Anna, et al. &quot;The role of seasonality of mineral dust concentration and size on glacial/interglacial dust changes in the EPICA Dronning Maud Land ice core.&quot; Journal of Geophysical Research: Atmospheres 120.19 (2015): 9916-9931.&lt;/p&gt;&lt;p&gt;[4] Baccolo, Giovanni, et al. &amp;#8220;The contribution of synchrotron light for the characterization of atmospheric mineral dust in deep ice cores: Preliminary results from the Talos Dome ice core (East Antarctica).&amp;#8221; Condensed Matter 3, no. 3 (2018): 25.&lt;/p&gt;&lt;p&gt;[5] De Angelis, Martine, et al. &amp;#8220;Micro-investigation of EPICA Dome C bottom ice: Evidence of long term in situ processes involving acid-salt interactions, mineral dust, and organic matter.&amp;#8221; Quaternary Science Reviews 78 (2013): 248-265.&lt;/p&gt;&lt;p&gt;[6] Gabrielli, Paolo, et al. &amp;#8220;A major glacial-interglacial change in aeolian dust composition inferred from Rare Earth Elements in Antarctic ice.&amp;#8221; Quaternary Science Reviews 29, no. 1-2 (2010): 265-273.&lt;/p&gt;&lt;p&gt;&lt;strong&gt;&amp;#160;&lt;/strong&gt;&lt;/p&gt;

scholarly journals Valuation of rare earth elements in ore deposits in the Murmansk Region

2020 ◽  
pp. 42-46
Author(s):  
A. O. Kalashnikov ◽  
◽  
N. G. Konopleva ◽  
G. Yu. Ivanyuk ◽  
◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Ore Deposits ◽  
Murmansk Region

Polymorphism in the Germanides REPdGe with the Heavy Rare Earth Elements

2009 ◽  
Vol 64 (6) ◽  
pp. 595-602 ◽  
Author(s):  
Ute Ch. Rodewald ◽  
Birgit Heying ◽  
Rolf-Dieter Hoffmann ◽  
Dirk Niepmann ◽  
Rainer Pöttgen
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Crystal Chemical ◽  
Heavy Rare Earth ◽  
Space Group ◽  
Structure Space ◽  
Arc Melting ◽  
Different Temperatures ◽  
Heavy Rare Earth Elements ◽  
Interlayer Bonding

The structures of the equiatomic germanides REPdGe with the heavy rare earth elements have been reinvestigated with respect to palladium-germanium ordering. The samples were prepared by arc-melting of the elements followed by annealing procedures in sealed silica ampoules at different temperatures. The structures of YPdGe, HT-TbPdGe, LT-DyPdGe, HT-DyPdGe, LT-HoPdGe, HT-HoPdGe, ErPdGe, and TmPdGe, and of the new germanide LuPdGe, were refined from single crystal diffractometer data. LT-DyPdGe and LT-HoPdGe crystallize with the YPdSi-type structure, space group Pmmn. The other germanides crystallize with the non-centrosymmetric YbAuSn structure, space group Imm2. All structures are orthorhombically-distorted superstructure variants of AlB2, and they show strong intralayer Pd-Ge bonding within the ordered Pd3Ge3 hexagons. There is weak Pd-Ge and Pd-Pd interlayer bonding. The crystal chemical relationship between the different superstructures is discussed.

scholarly journals Preliminary Study for the Determination of Rare Earth Elements Using the ICP-MS Technique

2020 ◽  
Vol 71 (4) ◽  
pp. 277-288
Author(s):  
Gina Alina Catrina (Traistaru) ◽  
Gabriela Geanina Vasile ◽  
Ionut Nicolae Cristea ◽  
Georgiana Cernica ◽  
Cristina Ileana Covaliu ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Rare Earth ◽  
Nitric Acid ◽  
Rare Earth Elements ◽  
Aqua Regia ◽  
Calcination Process ◽  
Icp Ms ◽  
Different Temperatures ◽  
Digestion Methods

This paper proposes an optimized method for the determination of rare earth elements (Sc, Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu) from soils using ICP-MS technique. First, the soil samples were thermal treated at three different temperatures 550ºC, 700ºC and 8500C in order to eliminate organic matter interferences. Then, the residual samples remaining from the calcination process were extracted in acidic medium with two different digestion methods (method I - a mixture of nitric acid and hydrogen peroxide; method II - aqua regia mixture) in order to quantify rare earth elements content. The highest recovery percentages for the major rare earth elements analyzed (Sc, Y, La, Ce, Pr, Nd. Sm) were situated in the range 86.13% to 99.90%, in sample residues thermally treated at 700�C and extracted with nitric acid and hydrogen peroxide.

scholarly journals STATE OF WATER BODIES IN THE AREA OF INFLUENCE OF MINING AND PROCESSING ENTERPRISES (CASE STUDY OF LOVOZERSKY MINING AND PROCESSING PLANT)

2021 ◽  
Vol 26 (2) ◽  
pp. 3-13
Author(s):  
E. A. Krasavtseva ◽  
◽  
S. S. Sandimirov ◽  
Keyword(s):  
Rare Earth ◽  
Chemical Composition ◽  
Rare Earth Elements ◽  
Bottom Sediments ◽  
Surface Waters ◽  
Pollution Index ◽  
Water Bodies ◽  
Processing Plant ◽  
Background Values ◽  
Murmansk Region

Introduction. This extended study is the first to analyze the chemical composition of the surface waters and bottom sediments of the lakes affected to various extents by Lovozersky Mining and Processing Plant (Revda urban settlement, Murmansk Region) performing mining and processing of rare metal ores. Methods. During the study, we used data obtained in the course of research in 1995–2005 and 2019–2020. Water and bottom sediment samples were analyzed using various methods. The total contents of elements in the bottom sediments were compared with the background values or, in their absence, with the clarke contents of elements in the Earth’s crust. To assess the level of pollution in the Sergevan River receiving wastewater from the plant, the maximum pollution index was calculated. Results. Over the past 35 years, the chemical composition of the surface waters of nearby water bodies underwent minor changes. No significant excess of maximum permissible concentrations for fishery water bodies was found. The comparison of the contents of heavy metals in the bottom sediments collected from Lakes Ilma and Krivoye with the background values revealed contamination of the Lake Ilma with strontium, zinc and manganese. Besides, a multiple excess of the content of rare earth elements (La, Ce, Pr, Nd), Nb and Ta was established in the bottom sediments of Lake Ilma in comparison with that in Lake Krivoye. The analysis of the river water samples taken at different distances upstream and downstream the site of wastewater discharge confirmed the assumption about the pollution of the Sergevan River by wastewater from the plant. Conclusion. The pollution of the water bodies is mainly caused by wastewater discharged from the plant, however, the increased content of rare earth elements in the bottom sediments of Lake Ilma may be due to air transport of particles of loparite ore concentration tailings, drainage from tailing dams, or degradation of underlying rocks.

scholarly journals Studies on adsorption of rare earth elements from nitric acid solution with macroporous silica-based bis(2-ethylhexyl)phosphoric acid impregnated polymeric adsorbent

2018 ◽  
Vol 36 (3-4) ◽  
pp. 1049-1065 ◽  
Author(s):  
Qiding Shu ◽  
Afshin Khayambashi ◽  
Xinpeng Wang ◽  
Yuezhou Wei
Keyword(s):  
Rare Earth ◽  
Nitric Acid ◽  
Phosphoric Acid ◽  
Rare Earth Elements ◽  
Solid Phase ◽  
Macroporous Silica ◽  
Different Temperatures ◽  
Heavy Rare Earth Elements ◽  
Increasing Temperature ◽  
Light Rare Earth Elements

For the adsorption and recovery of rare earth elements from aqueous nitric acid, solid-phase extraction resins were prepared by impregnating and immobilizing of bis(2-ethylhexyl)phosphoric acid extractant into the macroporous silica-based polymeric (SiO2-P) particles. It was found that bis(2-ethylhexyl)phosphoric acid/SiO2-P had higher adsorption distribution coefficient for heavy rare earth elements than for light rare earth elements. The adsorption capacity of Gd(III) was observed to be 0.315 mmol g−1 by bis(2-ethylhexyl)phosphoric acid/SiO2-P in 0.1 M HNO3 at 298 K, which increased slightly when increasing temperature from 298 to 323 K. The adsorption isotherms of Gd(III) matched well with the Langmuir and Freundlich models. The obtained thermodynamic parameters (ΔHo and ΔGo) showed that the adsorption of Gd(III) by bis(2-ethylhexyl)phosphoric acid/SiO2-P was a spontaneous and exothermic process. This study also evaluated the chemical stability of bis(2-ethylhexyl)phosphoric acid/SiO2-P treated with nitric acid at different temperatures and demonstrated that bis(2-ethylhexyl)phosphoric acid/SiO2-P had considerable stability against nitric acid and heat.

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