scholarly journals Value of Rapid Mineralogical Monitoring of Copper Ores

Minerals ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1142
Author(s):  
Matteo Pernechele ◽  
Ángel López ◽  
Diego Davoise ◽  
María Maestre ◽  
Uwe König ◽  
...  
Keyword(s):  
Decision Making ◽  
Cluster Analysis ◽  
Chemical Analysis ◽  
Rietveld Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Whole Process ◽  
Flotation Cells ◽  
Copper Ores

An essential operation in the mineral processing of copper ores into concentrates is blending, as it guarantees a constant feed for the flotation cells, increases metal recovery rate and reduces tailings. In this study, copper ores from Huelva province (Spain) were investigated by quantitative XRD (X-ray diffraction) methods to optimize blending and detect penalty minerals, which can affect flotation and concentrate quality. The Rietveld method in combination with cluster analysis, PLSR and more traditional chemical analysis provide a more complete and in-depth characterization of the ore and the whole process. The mineralogical monitoring can be fully automated to enable real-time decision making.

New Coordination Compounds of Fe(III) with Organic Ligands

2009 ◽  
Vol 59 (12) ◽  
Author(s):  
Mihaela Flondor ◽  
Ioan Rosca ◽  
Doina Sibiescu ◽  
Mihaela-Aurelia Vizitiu ◽  
Daniel-Mircea Sutiman ◽  
...  
Keyword(s):  
Chemical Analysis ◽  
Complex Compounds ◽  
Organic Ligands ◽  
X Ray Diffraction ◽  
X Ray ◽  
Elemental Chemical Analysis ◽  
Structural Formulae ◽  
Paramagnetic Properties

In this paper the synthesis and the study of some complex compounds of Fe(III) with ligands derived from: 2-(4-chloro-phenylsulfanyl)-1-(2-hydroxy-3,5-diiodo-phenyl)-ethanone (HL1), 1-(3,5-dibromo-2-hydroxy-phenyl)-2-phenylsulfanyl-ethanone(HL2), and 2-(4-chloro-phenylsulfanyl)-1-(3,5-dibromo-2-hydroxy-phenyl)-ethanone (HL3) is presented. The characterization of these complexes is based on method as: the elemental chemical analysis, IR and ESR spectroscopy, M�ssbauer, the thermogravimetric analysis and X-ray diffraction. Study of the IR and chemical analysis has evidenced that the precipitates form are a complexes and the combination ratio of M:L is 1:2. The central atoms of Fe(III) presented paramagnetic properties and a octaedric hybridization. Starting from this precipitation reactions, a method for the gravimetric determination of Fe(III) with this organic ligands has been possible. Based on the experimental data on literature indications, the structural formulae of the complex compounds are assigned.

Purification of Bentonite Clays from Cubati, PB, Brazil, for Diversified Applications

2014 ◽  
Vol 805 ◽  
pp. 486-491
Author(s):  
J.M.R. Figueirêdo ◽  
Juliana Melo Cartaxo ◽  
I.A. Silva ◽  
C.D. Silva ◽  
Gelmires Araújo Neves ◽  
...  
Keyword(s):  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
Chemical Analysis ◽  
Laser Diffraction ◽  
The State ◽  
X Ray Diffraction ◽  
X Ray ◽  
Granulometric Analysis ◽  
Bentonite Clays

The State of Paraíba, Brazil, retains about 88.5% of all Brazilian bentonite, and much of this production comes from deposits in the District of Boa Vista, PB. Nevertheless, the deposits are almost depleted. Recently, new deposits were found, which will increases the reserves of the State, in the regions of Cubati and Pedra Lavrada, PB. The objective of this work is to characterize and develop purified clays, through sieving and hydrocycloning techniques, from those recently discovered bentonites for several applications. The characterization of the sample was done through granulometric analysis by laser diffraction, X-ray diffraction, chemical analysis by X-ray fluorescence, and thermogravimetric and differential thermal analysis. The results show that the samples are typical of bentonite clays, and that the purification solely by hydrocyclone presents the best results.

Microstructural Characterization of Ornamental Rock Samples: Cariri Rocks

2016 ◽  
Vol 869 ◽  
pp. 159-163
Author(s):  
Danúbia Lisbôa da Costa ◽  
Ingrid Mayara Medeiros Fernandes ◽  
Aluska Nascimento Simões Braga ◽  
Rosiane Maria da Costa Farias ◽  
Romualdo Rodrigues Menezes ◽  
...  
Keyword(s):  
Chemical Analysis ◽  
Microstructural Characterization ◽  
Magnesium Carbonate ◽  
X Ray Diffraction ◽  
X Ray ◽  
Mineral Sector ◽  
Microstructural Heterogeneity ◽  
Calcium And Magnesium ◽  
Application Fields

Ornamental rocks are among the most promising business areas of the mineral sector, raising the necessity for, besides beauty, investments in quality, safety and characterization in the various application fields of these rocks. So, this work aims at the microstructural characterization of the class of these rocks: the Cariri Rocks, also known the limestone, which are calcareous rocks mainly formed by calcium and magnesium carbonate, possibly presenting variations due to their origins. For characterization, we studied four samples, being two from Chapada do Apodi and two from Chapada do Araripe, characterized physically and micro-structurally through chemical analysis, X-ray diffraction, optical micrography and porosimetry tests. The results prove that the limestones are calcitic and dolomitic, and present porosity varying from 5 to 15%, with pores concentration between 100nm and 10μm, besides the high microstructural heterogeneity.

Characterization of kaolinite in the hardsetting clay fraction using atomic force microscopy, X-ray diffraction, and the Rietveld method

2017 ◽  
Vol 17 (8) ◽  
pp. 2144-2155 ◽  
Author(s):  
Luis Valério Prandel ◽  
Nívea Maria Piccolomini Dias ◽  
Sérgio da Costa Saab ◽  
André Maurício Brinatti ◽  
Neyde Fabíola Balarezo Giarola ◽  
...  
Keyword(s):  
Atomic Force Microscopy ◽  
Rietveld Method ◽  
Clay Fraction ◽  
X Ray Diffraction ◽  
X Ray ◽  
Force Microscopy ◽  
Atomic Force

scholarly journals CHARACTERIZATION OF CLAYS IN THE ZINDER REGION BY X-RAY DIFFRACTION AND X-RAY FLUORESCENCE METHODS

2020 ◽  
Vol 8 (12) ◽  
pp. 1088-1095
Author(s):  
Abdoulkader Moussa Issaka ◽  
◽  
Bouba Hassane ◽  
Ibrahim Wagani ◽  
Amadou Abdourhamane Toure ◽  
...  
Keyword(s):  
Chemical Analysis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Fluorescence Methods ◽  
Composite Samples ◽  
Mineralogical Phases

In order to characterizeclays of the Zinder region, 20 samples were taken from the quarries of Magaria, Mirriah, Guidimouni and Kolleram and four composite samples were made and representative of the quarries. These samples were subjected to chemical and mineralogical analyzes. Chemical analysis shows that the materials from these four quarries are aluminosilicates, but in varying proportions. The samplesfrom the Magaria and Kolleramquarries, contain proportions of carbonwhichinducethem a blackishcolor and alkaline and alkaline-earthelements (CaO, K2O, MgO. The samplesfromMirriah and Guidimouni,are veryrich in ironoxide (Fe2O3) whichinduces a reddishcolor. The main mineralogical phases detected by X-ray diffraction in the rawsamples and fine fractions from the four quarrieswere kaolinite, a mica structure close to illite and quartz.Thesequarriesthenconstitutekaolinicdeposits, primary and secondary. Those of Magaria and Kolleram are secondary and less favorable to formulations of ceramicproducts and those of Mirriah and Guidimouni are primary and very favorable to formulations of ceramicproductssuch as potteryfromMirriah.

Synthesis and characterization of powder four borate Sr3Sm2(BO3)4

2013 ◽  
Vol 28 (4) ◽  
pp. 262-268 ◽  
Author(s):  
Jia-Yong Si ◽  
Ge-Mei Cai
Keyword(s):  
Crystal Structure ◽  
Rietveld Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Reflection Measurement ◽  
Crystallographic Study ◽  
Anionic Groups ◽  
Very High ◽  
Uv Range

Polycrystalline Sr3Sm2(BO3)4 borate has been synthesized through a solid-state reaction, and the title compound is stable in air and water. Its crystal structure was investigated from powder X-ray diffraction data using the Rietveld method. The fundamental building units of the crystal Sr3Sm2(BO3)4 are isolated BO3 anionic groups, distorted Sm–O polyhedra, and irregular Sr–O polyhedra, with the crystal structure isostructural to Sr3Nd2(BO3)4. The infrared spectrum of Sr3Sm2(BO3)4 has been measured, which is consistent with the crystallographic study. According to diffuse reflection measurement of Sr3Sm2(BO3)4 powders, the absorption edge is in the deep UV range and UV-vis transmittance is very high. Phosphor Sr3Sm2(BO3)4 exhibits an orange-red emission.

Characterization of Clay from Vale do Mulembá - ES

2008 ◽  
Vol 591-593 ◽  
pp. 487-492 ◽  
Author(s):  
Monica Castoldi Borlini Gadioli ◽  
J.C.G. Correia ◽  
A. Caranassios
Keyword(s):  
Particle Size ◽  
Chemical Analysis ◽  
Thermal Analyses ◽  
The Other ◽  
High Plasticity ◽  
X Ray Diffraction ◽  
X Ray ◽  
Characterization Studies ◽  
And Behavior

This work has for objective to characterize the clay from Vale do Mulembá-ES. The Vale do Mulembá is located in Joana D´Arc, Vitória in Espírito Santo State, Brazil. That clay is used in the production of the traditional clay pans of the State, what contributes to the economy of the area. The clay from Vale do Mulembá presents characteristics and behavior different from the other clays used for the production of clay pans. The characterization studies were carried out through chemical analysis, X-ray diffraction, particle size distribution, plasticity and thermal analyses (DTA, TGA). The results showed that the clay is typical kaolinitic, present relatively to the amount high of Al2O3 and high plasticity.

The Synthesis and Characterization of ZrW2O7(OH1-X,ClX)2·2H20 (X=0.016, 0.025)

2006 ◽  
Vol 251-252 ◽  
pp. 21-26
Author(s):  
Yi Long Cao ◽  
Xue Bin Deng ◽  
Hui Ma ◽  
Shui Feng Wang ◽  
Xin Hua Zhao
Keyword(s):  
Potentiometric Titration ◽  
Rietveld Method ◽  
Chloride Ion ◽  
Hydroxyl Group ◽  
Synthesis And Characterization ◽  
X Ray Diffraction ◽  
X Ray

ZrW2O7(OH1-x,Clx)2·2H2O (x = 0.016, 0.025) is prepared by using the acid steam hydrothermal (ASH) method. The chlorine contents of the crystals are measured by means of potentiometric titration and ICP, respectively. The as-prepared powders are characterized by X-ray diffraction, and their structures are refined by using the Rietveld method contained in the GSAS program. The results indicate that the chloride ion occupies the hydroxyl group crystal site statistically.

Characterization of Microstructure in High Strength Microalloyed Steels Using Quantitative X-Ray Diffraction

2008 ◽  
Author(s):  
X. Li ◽  
J. B. Wiskel ◽  
H. Henein ◽  
D. G. Ivey ◽  
O. Omotoso
Keyword(s):  
Mechanical Properties ◽  
Rietveld Method ◽  
Domain Size ◽  
High Strength ◽  
Preferred Orientation ◽  
Microalloyed Steels ◽  
X Ray Diffraction ◽  
X Ray ◽  
X80 Steels

The mechanical properties of microalloyed steels used in pipelines are strongly affected by microstructure. In this paper, X-ray diffraction (Rietveld method) was used to quantify the microstructure — specifically domain size, microstrain and preferred orientation — for four X80 steels and three experimental X100 steels. Measurements were made at the surface and at several positions below the surface. Nano-sized domains were obtained for all steels tested. A smaller domain size, higher microstrain and stronger preferred orientation were observed in the X100 samples relative to the X80 steels.

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