scholarly journals Extraction of Copper from Copper-Bearing Materials by Sulfation Roasting with SO2-O2 Gas

JOM ◽  
2020 ◽  
Vol 72 (10) ◽  
pp. 3436-3446
Author(s):  
Xingbang Wan ◽  
Junjie Shi ◽  
Pekka Taskinen ◽  
Ari Jokilaakso
Keyword(s):  
Theoretical Basis ◽  
Raw Materials ◽  
Pure Copper ◽  
Copper Slag ◽  
Complete Separation ◽  
X Ray ◽  
Copper Compounds ◽  
Sulfation Roasting ◽  
Thermodynamic Conditions ◽  
Bearing Materials

Abstract Recycling metals from secondary materials and more complex ores has recently been attracting more attention, creating a need for more precise separation methods of different elements. This study proposed a sulfation-roasting method and designed thermodynamic conditions to selectively facilitate the formation of copper sulfate while separating iron as oxide. The roasting behaviors for chalcopyrite, copper slag, and pure copper compounds were investigated in a 0.5% SO2–0.5% O2–99% Ar atmosphere at 600°C. X-ray fluorescence spectroscopy, x-ray diffractometry, scanning electron microscopy, and energy dispersive x-ray spectrometry were used to characterize the raw materials and roasting products. The proposed methodology was confirmed for a complete separation of Cu from Fe, and, further, the sulfation-roasting mechanism of chalcopyrite was confirmed by thermodynamic calculations and experimental observations. These will provide a theoretical basis for copper recycling from both complex primary and secondary copper-bearing materials.

scholarly journals Determining patterns in the use of finishing formulations for trimming the Crust leather

2021 ◽  
Vol 1 (6 (109)) ◽  
pp. 57-63
Author(s):  
Tymofiі Lуpskyі ◽  
Nataliia Pervaia ◽  
Olena Okhmat ◽  
Olena Mokrousova ◽  
Аntonina Babych
Keyword(s):  
Raw Materials ◽  
Front Surface ◽  
Blue Color ◽  
Chromatography Method ◽  
X Ray ◽  
Copper Compounds ◽  
Wet Friction ◽  
Cobalt Compounds ◽  
Elementary Chemical ◽  
Iron Chromium

This paper has considered the possibility of using new finishing formulations to finish the Crust leather, manufactured from cattle raw materials aimed to finish shoes and leather garments.The quality indicators of finishing formulations and their elementary chemical composition have been investigated. It was found that the finishing formulations possess a high covering capacity due to the presence of mineral pigments in their composition. X-ray fluorescent analysis has proven that the presence of chromium pigments and copper compounds renders the green color to the composition; the compounds of cobalt, copper, iron, chromium ‒ blue color; cobalt compounds ‒ reddish-brown color.It has been established that the finishing formulations are resistant to the effect of electrolytes of different nature over a wide pH interval, from 2 to 11.When determining the uniformity of the composition by using a chromatography method involving fan-shaped paper, it was found that the composition of blue has a pronounced purple hue, of reddish-brown – red.The effectiveness of the use of finishing formulations to finish the Crust leather has been proven by determining the indicators of its quality. The finishing formulations give the Crust high resistance to dry (exceeding 500 rotations) and wet friction (exceeding 150 rotations), multiple bending (exceeding 50,000 rotations), the effect of water (2 to 5 points), and organic solvents (2 to 4 points). At the same time, the finishing formulations are characterized by rapid diffusion into the structure of the leather with a natural front surface with the simultaneous provision of specific properties to it. Specifically: water-repelling properties (hydrophobicity), shine, wax grain, matte, saturated homogeneous color. The leather with the introduced finishing formulations does not require fixing the resulting coating with water-based varnish.It is recommended to use the finishing formulations in the production of Crust leather shoe top by applying them onto the surface by spraying or using a brush to create the desired effect

scholarly journals X-RAY FLUORESCENCE ANALYSIS AND THE X-RAY SPECTRAL MICROANALYSIS OF LATE BOSPORAN STATERS FROM THE PHANAGORIAN AND GAI-KODZOR HOARDS: TECHNICAL ASPECTS AND POSSIBLE COPPER ORE SOURCES

2021 ◽  
pp. 402-413
Author(s):  
М. Г. Абрамзон ◽  
Ю. Ю. Ефимова ◽  
Н. В. Копцева ◽  
И. А. Сапрыкина
Keyword(s):  
Cross Sections ◽  
Raw Materials ◽  
Copper Alloys ◽  
Pure Copper ◽  
Fluorescence Analysis ◽  
Copper Ore ◽  
X Ray ◽  
Ferrous Metals ◽  
Wide Range ◽  
Copper Coin

Боспорские статеры 285/286-341/342 гг. н. э. подверглись исследованию методами рентгенофлуоресцентного анализа (РФА) и рентгеноспектрального микроанализа (РСМА) в сканирующем электронном микроскопе (СЭМ) с целью определения химического состава сплава и возможных источников медного сырья для чеканки монет. Установлено, что на боспорском монетном дворе применялась широкая номенклатура медных сплавов: медь, свинцовая, оловянная, оловянно-свинцовая и многокомпонентная бронзы, а также сплавы меди с добавками серебра. В условиях дефицита чистой меди на монетном дворе использовался медный лом, содержащий другие цветные металлы. Археометрические исследования позволяют проследить по годам эмиссий динамику деградации сплавов статеров, вызванную высокими темпами инфляции в правление Фофорса - Рескупорида VI. «Порча» медной монеты вызвана напряженными поисками государством финансов для борьбы с варварами. Полученные данные проливают новый свет на малоизвестные особенности монетного производства позднего Боспора. The Bosporan staters of AD 285/286-341/342 were investigated at their surfaces by X-ray fluorescence analysis (XRF) and at the cross-sections by X-ray spectral microanalysis in the scanning electron microscope (SEM/EDXMA) in order to determine the chemical composition of the alloy and proposal sources of copper raw materials for coin production. It is established that the Bosporan mint used a wide range of copper alloys: copper, lead-, tin-, tin-lead and multicomponent bronzes, as well as copper alloys with silver additives. When there was a deficit of pure copper, the mint used copper scrap containing other non-ferrous metals. Archaeometric studies allow us to trace the dynamics of degradation of coinage alloys over the years of emissions caused by high rates of inflation during the reign of Thothorses to Rhescuporis VI. The ‘damage' of the copper coin is caused by the state's intense search for money to fight the barbarians. The obtained data shed new light on a little-known feature of the Later Bosporan Kingdom coin production.

scholarly journals Invasive and Non-Invasive Analyses of Ochre and Iron-Based Pigment Raw Materials: A Methodological Perspective

Minerals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 210
Author(s):  
Laure Dayet
Keyword(s):  
Material Selection ◽  
Raw Materials ◽  
Methodological Approach ◽  
Raw Material ◽  
Human Populations ◽  
Major Element Composition ◽  
X Ray ◽  
Non Invasive ◽  
Bearing Materials ◽  
Rigorous Framework

Naturally occurring and deeply coloured iron-bearing materials were exploited very early on by human populations. The characterization of these materials has proven useful for addressing several archaeological issues, such as the study of technical behaviors, group mobility, and the reconstruction of cultural dynamics. However, this work poses some critical methodological questions. In this paper, we will review ochre studies by focusing on the analytical methods employed, the limits of non-invasive methods, as well as examples of some quality research addressing specific issues (raw material selection and provenience, heat treatment). We will then present a methodological approach that aims to identify the instrumental limits and the post-depositional alterations that significantly impact the results of the non-invasive analysis of cohesive ochre fragments from Diepkloof rock Shelter, South Africa. We used ochre materials recuperated in both archaeological and geological contexts, and we compared non-invasive surface analyses by XRD, scanning electron microscopy coupled with dispersive X-ray spectrometry (SEM-EDXS), and particle-induced X-ray emission (PIXE) with invasive analysis of powder pellets and sections from the same samples. We conclude that non-invasive SEM-EDXS and PIXE analyses provide non-representative results when the number of measurements is too low and that post-depositional alterations cause significant changes in the mineralogical and major element composition at the surface of archaeological pieces. Such biases, now identified, must be taken into account in future studies in order to propose a rigorous framework for developing archaeological inferences.

Improving soil remediation through characterization

1995 ◽  
Vol 53 ◽  
pp. 386-387
Author(s):  
E. C. Buck ◽  
N. L. Dietz ◽  
J. K. Bates
Keyword(s):  
Dust Particles ◽  
Radiochemical Analysis ◽  
Solid Product ◽  
Uranium Contamination ◽  
Physical Separation ◽  
X Ray ◽  
Rocky Flats ◽  
Remediation Strategies ◽  
Bearing Materials ◽  
X Ray Absorption

Operations at former weapons processing facilities in the U. S. have resulted in a large volume of radionuclidecontaminated soils and residues. In an effort to improve remediation strategies and meet environmental regulations, radionuclide-bearing particles in contaminant soils from Fernald in Ohio and the Rocky Flats Plant (RFP) in Colorado have been characterized by electron microscopy. The object of these studies was to determine the form of the contaminant radionuclide, so that it properties could be established [1]. Physical separation and radiochemical analysis determined that uranium contamination at Fernald was not present exclusively in any one size/density fraction [2]. The uranium-contamination resulted from aqueous and solid product spills, air-borne dust particles, and from the operation of an incinerator on site. At RFP the contamination was from the incineration of Pu-bearing materials. Further analysis by x-ray absorption spectroscopy indicated that the majority of the uranium was in the 6+ oxidation state [3].

Usability of field X-ray fluorescence analyzers for determination of the chemistry of cement raw materials - using an example of Mokrá Quarry

2016 ◽  
Author(s):  
Jiří Zimák ◽  
Kristýna Dalajková ◽  
Roman Donocik ◽  
Petr Krist ◽  
Daniel Reif ◽  
...  
Keyword(s):  
Raw Materials ◽  
X Ray

scholarly journals Waste and Solar Energy: An Eco-Friendly Way for Glass Melting

2021 ◽  
Vol 5 (2) ◽  
pp. 16
Author(s):  
Isabel Padilla ◽  
Maximina Romero ◽  
José I. Robla ◽  
Aurora López-Delgado
Keyword(s):  
Solar Energy ◽  
Environmental Sustainability ◽  
Raw Materials ◽  
Glass Melting ◽  
Glass Network ◽  
X Ray Diffraction ◽  
X Ray ◽  
Concentrated Solar Energy ◽  
Calcium Source ◽  
The Aluminum Industry

In this work, concentrated solar energy (CSE) was applied to an energy-intensive process such as the vitrification of waste with the aim of manufacturing glasses. Different types of waste were used as raw materials: a hazardous waste from the aluminum industry as aluminum source; two residues from the food industry (eggshell and mussel shell) and dolomite ore as calcium source; quartz sand was also employed as glass network former. The use of CSE allowed obtaining glasses in the SiO2-Al2O3-CaO system at exposure time as short as 15 min. The raw materials, their mixtures, and the resulting glasses were characterized by means of X-ray fluorescence, X-ray diffraction, and differential thermal analysis. The feasibility of combining a renewable energy, as solar energy and different waste for the manufacture of glasses, would highly contribute to circular economy and environmental sustainability.

scholarly journals Mining Wastes of an Albite Deposit as Raw Materials for Vitrified Mullite Ceramics

Minerals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 232
Author(s):  
Pedro J. Sánchez-Soto ◽  
Eduardo Garzón ◽  
Luis Pérez-Villarejo ◽  
George N. Angelopoulos ◽  
Dolores Eliche-Quesada
Keyword(s):  
Particle Size ◽  
Raw Materials ◽  
Phase Evolution ◽  
Particle Size Analysis ◽  
Size Analysis ◽  
Mining Wastes ◽  
X Ray Diffraction ◽  
X Ray ◽  
Maximum Value

In this work, an examination of mining wastes of an albite deposit in south Spain was carried out using X-ray Fluorescence (XRF), X-ray diffraction (XRD), particle size analysis, thermo-dilatometry and Differential Thermal Analysis (DTA) and Thermogravimetric (TG) analysis, followed by the determination of the main ceramic properties. The albite content in two selected samples was high (65–40 wt. %), accompanied by quartz (25–40 wt. %) and other minor minerals identified by XRD, mainly kaolinite, in agreement with the high content of silica and alumina determined by XRF. The content of Na2O was in the range 5.44–3.09 wt. %, being associated with albite. The iron content was very low (<0.75 wt. %). The kaolinite content in the waste was estimated from ~8 to 32 wt. %. The particle size analysis indicated values of 11–31 wt. % of particles <63 µm. The ceramic properties of fired samples (1000–1350 °C) showed progressive shrinkage by the thermal effect, with water absorption and open porosity almost at zero at 1200–1250 °C. At 1200 °C, the bulk density reached a maximum value of 2.38 g/cm3. An abrupt change in the phase evolution by XRD was found from 1150 to 1200 °C, with the disappearance of albite by melting in accordance with the predictions of the phase diagram SiO2-Al2O3-Na2O and the system albite-quartz. These fired materials contained as main crystalline phases quartz and mullite. Quartz was present in the raw samples and mullite was formed by decomposition of kaolinite. The observation of mullite forming needle-shape crystals was revealed by Scanning Electron Microscopy (SEM). The formation of fully densified and vitrified mullite materials by firing treatments was demonstrated.

Research on Properties of Low Grade Cement-Based Composite Materials Modified by Silica Fume

2012 ◽  
Vol 174-177 ◽  
pp. 751-756
Author(s):  
Zi Fang Xu ◽  
Ming Xu Zhang ◽  
Jin Hua Li
Keyword(s):  
Silica Fume ◽  
Mechanical Performance ◽  
Raw Materials ◽  
Cement Matrix ◽  
Hardened Cement ◽  
Low Grade ◽  
X Ray ◽  
Matrix Microstructure ◽  
Nano Powder ◽  
Strength And Durability

In order to notably improve the mechanical properties and durability of low-grade cement-based material, superfine silica fume was used to modify the cement-based composite based on special perfomance and effects of nano powder. The mechanical performance and durability were investigated.Then the phase compositions,microstructure and morphologies of as-received cement-based composite were studied by X-ray Diffractometer、TGA-DTA and SEM. The results show that： the best formula of raw materials is 1:1:0.025:0.015, and hydration can be accelerated and increasing of hydration products is observed after modification. In the hardened cement matrix, microstructure is very compacted and C-S-H gel forms densed structure, so the structure defect is notably reduced. This means that both strength and durability of cement-based composite are notably improved by the addition of superfine silica fume.

X-ray photoelectron spectroscopy of copper compounds

1972 ◽  
Vol 24 (4) ◽  
pp. 861-877 ◽  
Author(s):  
D.C. Frost ◽  
A. Ishitani ◽  
C.A. McDowell
Keyword(s):  
Photoelectron Spectroscopy ◽  
X Ray ◽  
Copper Compounds
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