scholarly journals Kinetic investigations of oxidative roasting and afterwards leaching of copper-lead matte

2004 ◽  
Vol 40 (1) ◽  
pp. 57-73 ◽  
Author(s):  
Dusko Minic ◽  
Desimir Petkovic ◽  
N. Strbac ◽  
Ivan Mihajlovic ◽  
Zivan Zivkovic
Keyword(s):  
Electron Microscopy ◽  
Oxidation Process ◽  
Composition Analysis ◽  
Characteristic Temperatures ◽  
Oxidative Roasting ◽  
Chemical Composition Analysis ◽  
Lead Production ◽  
Kinetic Investigations ◽  
Copper Lead

In this paper, results of copper - lead matte investigations are presented. Investigated copper-lead matte is intermediate product of lead production in TREPCA-Zvecan. In the first part of the paper characterization of starting material is presented, consisting of: chemical composition analysis (XRQ), sceaning electron microscopy (SEM) and diffractometry (XRD). Thermal properties of matte investigated were determined using differential thermal analysis (DTA) at characteristic temperatures. Using results of induced analysis, mechanism of matte oxidation process was determined. In second part of the paper kinetic parameters describing oxidative roasting and afterwards leaching in sulfuric acid of copper-lead mate are presented.

scholarly journals Physicochemical and Nutritional Characterization of Starch Isolated fromColocasia antiquorumCultivated in Oaxaca, Mexico

2016 ◽  
Vol 2016 ◽  
pp. 1-7 ◽  
Author(s):  
Karina Ríos-Ríos ◽  
Edith González-Mondragón ◽  
Maira Segura-Campos ◽  
Mariela Ramírez-Jiménez ◽  
Jesús López-Luna ◽  
...  
Keyword(s):  
Absorption Capacity ◽  
Added Value ◽  
Industrial Processes ◽  
Composition Analysis ◽  
Ellipsoidal Shape ◽  
Nutritional Characteristics ◽  
Chemical Composition Analysis ◽  
Potential Use ◽  
Total Starch

The physicochemical and nutritional characteristics ofColocasia antiquorum(taro coconut or Chinese taro) starch cultivated in Oaxaca, Mexico, were determined. The granules ofColocasia antiquorumpresented a truncated ellipsoidal shape. The chemical composition analysis showed levels of moisture, ash, protein, fat, fiber, and NFE in a dry base of 10.29, 0.18, 2.0, 0.05, 0.01, and 97.76, respectively, as well as amylose and amylopectin contents of 13.05 and 86.95%, respectively. Gelatinization temperatures, onset (To), peak (Tp), and final (Tf), were 72.86, 82.91, and 93.05°C, respectively. Solubility, swelling power (SP), and water absorption capacity (WAC) correlate directly with increments in temperature. Transmittance value (% T) for taro coconut was 0.3% and its apparent viscosity ranged from 100 to 150 cp. The nutritional characterization ofColocasia antiquorum’s starch amounted to 97.88% of total starch (TS), while available (AS) and resistant starch (RS) were 93.47 and 3.70%, respectively.Colocasia antiquorum, grown in Oaxaca, Mexico, is an unconventional source of starch with added value due to its potential use as an ingredient in the development of new products or as a substitute for conventional starch sources in industrial processes.

scholarly journals Failure Analysis of Weld Cracking in External Cold Water Pipeline of Condenser in Converter Station

2020 ◽  
Vol 165 ◽  
pp. 06031
Author(s):  
Jun Wang ◽  
Yaxia Qiao ◽  
Hao Zhang ◽  
Hongjian Lou
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Cold Water ◽  
Welding Process ◽  
Hardness Test ◽  
Control Measures ◽  
Composition Analysis ◽  
Chemical Composition Analysis ◽  
Water Pipeline ◽  
Scanning Electron

The cause of weld cracking in external cold water pipeline of condenser in a ±800kV converter station were analyzed by macro inspection, chemical composition analysis, hardness test, microstructure inspection, scanning electron microscopy and energy spectrum test methods.The results show that the main reason for the cracks is that the material and manufacturing process are not qualified, and the welding process is not good. Corresponding control measures are put forward to avoid similar failures from happening again.

Hydrothermal synthesis and characterization of a new potassium phosphatoantimonate

1994 ◽  
Vol 9 (11) ◽  
pp. 2745-2746 ◽  
Author(s):  
Yonglin An ◽  
Shouhua Feng ◽  
Yihua Xu ◽  
Ruren Xu ◽  
Yong Yue
Keyword(s):  
Photoelectron Spectroscopy ◽  
Synthesis And Characterization ◽  
Composition Analysis ◽  
X Ray Diffraction ◽  
Monoclinic System ◽  
X Ray ◽  
Monovalent Ions ◽  
Nmr Techniques ◽  
Chemical Composition Analysis

A new potassium phosphatoantimonate with a composition of 4K2O · 4Sb2O5 · P2O5 · 8H2O, which crystallizes in a monoclinic system with a = 23.952 Å, b = 9.515 Å, c = 8.193 Å, and β = 124.77, was hydrothermally synthesized and characterized by powder x-ray diffraction, chemical composition analysis, x-ray photoelectron spectroscopy, and 31P MAS-NMR techniques. The potassium ion can be exchanged by other monovalent ions.

scholarly journals Compositional Characterization of Different Industrial White and Red Grape Pomaces in Virginia and the Potential Valorization of the Major Components

Foods ◽  
2019 ◽  
Vol 8 (12) ◽  
pp. 667 ◽  
Author(s):  
Qing Jin ◽  
Joshua O’Hair ◽  
Amanda C. Stewart ◽  
Sean F. O’Keefe ◽  
Andrew P. Neilson ◽  
...  
Keyword(s):  
Phenolic Content ◽  
Grape Pomace ◽  
Total Phenolic ◽  
Composition Analysis ◽  
Cabernet Franc ◽  
Total Potential ◽  
Chemical Composition Analysis ◽  
Red Grape ◽  
Compositional Characterization

To better evaluate potential uses for grape pomace (GP) waste, a comprehensive chemical composition analysis of GP in Virginia was conducted. Eight commercial white and red pomace samples (cv. Viognier, Vidal Blanc, Niagara, Petit Manseng, Petit Verdot, Merlot, Cabernet Franc, and Chambourcin) obtained from different wineries in Virginia, USA were used. For extractives, GPs contained 2.89%–4.66% titratable acids, 4.32%–6.60% ash, 4.62%–12.5% lipids with linoleic acid being the predominant (59.0%–70.9%) fatty acid, 10.4–64.8 g total phenolic content (gallic acid equivalents)/kg GP, 2.09–53.3 g glucose/kg GP, 3.79–52.9 g fructose/kg GP, and trace sucrose. As for non-extractives, GPs contained 25.2%–44.5% lignin, 8.04%–12.7% glucan, 4.42%–7.05% xylan, and trace amounts of galactan, arabinan, and mannan (less than 3% in total). Potential usages of these components were further examined to provide information on better valorization of GP. Considering the valuable extractives (e.g., polyphenols and oil) and non-extractives (e.g., lignin), designing a biorefinery process aiming at fully recover and/or utilize these components is of future significance.

scholarly journals Characterization of Ni-P coating prepared via electroless deposition on AZ31 magnesium alloy

2017 ◽  
Vol 61 (1) ◽  
pp. 1-6 ◽  
Author(s):  
M. Buchtík ◽  
P. Kosár ◽  
J. Wasserbauer ◽  
P. Doležal
Keyword(s):  
Chemical Composition ◽  
Magnesium Alloy ◽  
Electroless Deposition ◽  
Mechanical Characteristics ◽  
Chemical Properties ◽  
Composition Analysis ◽  
Physico Chemical ◽  
Chemical Composition Analysis ◽  
Scanning Electron

Abstract This work deals with the characterization of Ni–P coating prepared via electroless deposition on wrought AZ31magnesium alloy. For the application of electroless deposition was proposed and optimized a suitable pretreatment process of magnesium alloy surface followed by Ni–P coating in the nickel bath. The chemical composition of Ni–P based coating was characterized using the scanning electron microscope with chemical composition analysis. Next, physico-chemical properties and mechanical characteristics of Ni–P coating were evaluated. The mechanism of corrosion degradation of the coating and the substrate was also studied in this work.

scholarly journals Laboratory testing results of kinetics and processing technology of the polymetallic sulphide concentrate Blagojev Kamen – Serbia

10.30544/220 ◽  
2016 ◽  
Vol 22 (2) ◽  
pp. 117-128
Author(s):  
Milorad Ćirković ◽  
Željko Kamberović ◽  
Mile Bugarin
Keyword(s):  
Laboratory Testing ◽  
Precious Metals ◽  
Raw Material ◽  
Smelting Product ◽  
Kinetics Parameters ◽  
Oxidative Roasting ◽  
Dta Analysis ◽  
Reduction Smelting ◽  
Kinetic Investigations

This work presents the laboratory testing results of kinetics the oxidation process and sample processing of the sulphide polymetallic concentrate Blagojev Kamen. The aim of investigation is recovery of these types of raw material, present in large quantities in the peripheral parts of already used primary mineral deposits of copper, because of their high economic potential due to the content of a large number of metals and especially precious metals. Characterization of this raw material is based on the chemical analyses, XRD results, DTA analysis, etc. For these investigations, the sulphide concentrate with the following content was used in %: Cu – 2.3; Fe – 19.8; S – 27.19; Zn – 9.13; As – 0.167; Pb – 15.63; SiO2 – 17.93; CaO – 0.97; Al2O3 – 1.43; Ag – 480 g/t; Au – 659 g/t. Kinetic investigations of oxidation processes were carried out under the isothermal conditions within the temperature range of 400 to 625 oC. The Sharp's model was used for determination the kinetics parameters, and determined values of activation energy are 67 kJ/mole for the first period, and 47 kJ/mole for the second period. Pyrometallurgical treatment of this type of polymetallic concentrate, in the laboratory conditions, was carried out using the oxidative roasting and, then the reduction smelting was done in the Taman's furnace. Gold from 90.5 to 97.95% and silver from 77.28 to 93.37% are moved into the raw lead (smelting product). Gold from 1.1 to 3.92% and silver from 4.35 to 8.42% are moved into the polymetallic copper matte. Gold from 0.58 to 1.6% and silver from 2.45 to 6.82% are moved into the slag.

Characterization of Nano-Structured Tin Oxide Film Prepared by Anodic Oxidation Process

2013 ◽  
Vol 829 ◽  
pp. 366-370 ◽  
Author(s):  
S. Mohammad Reza Mortazavi ◽  
Fereshteh Rashchi ◽  
Rasoul Khayyam Nekouei
Keyword(s):  
Electron Microscopy ◽  
Anodic Oxidation ◽  
Tin Oxide ◽  
Room Temperature ◽  
Oxidation Process ◽  
Eds Analysis ◽  
Anodization Process ◽  
Anodic Oxidation Process ◽  
Scanning Electron

In this study, synthesis of tin oxide by anodic oxidation of tin foils at room temperature in oxalic acid has been investigated. The prepared structure was characterized by field emission scanning electron microscopy (FESEM) and energy dispersive spectroscopy (EDS). FESEM results showed that the anodization process leads to formation of nanoporous, cuboid and granular structures. EDS analysis in all tested samples showed the constituents of tin and oxygen.

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