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Electro-Thermal and Semiconductivity Behaviour of Natural Sintered Complex Ca...Al Baha University
The polymetal (Zn, Pb, Fe, Ca, Mg, Cd, Ba, Ni, Ti, and SiO2) complex Umm-Gheig carbonate ore is subjected to sintering treatment at 573, 773, 973 and 1273 K respectively for four hours. Chemical, spectral, X-ray and differential thermal analyses are applied for the native ore as well as for the samples preheated and sintered. The I-V characteristics, bulk density (Db), percent shrinkage (%S), activation energy (Ea) and energy gap (Eg) are established for the sintered ore. The electrical conductivity (), thermal conductivity (K) and thermoelectric power coefficient () have been investigated as a function of applied temperature for the sintered ore materials. The electrical and thermal measurements show that the sintered ore has semiconductivity behaviour with temperature. The electrical conduction is mainly achieved by electrons or n-type. As the sintering temperature (Ts) increases the conduction of the ore is also increased owning to the recombination process takes place between the electrons and holes. Electrons hopping between Fe2+ and Fe3+ are the main charge carriers. The formation of Fe3O4 at high sintering temperature acts as an active mineralizer, thus inducing an increased degree of crystallinity and the more ordered crystal structure is produced.
Keywords
Electrolytic recovery of antimony from natural stibnite ore
Loutfy H. Madkour a, *, Ibrahim A. Salem b
a Chemistry Department, Faculty of Science, Tanta University, Tanta, Egypt b Geology Department, Faculty of Science, Tanta University, Tanta, Egypt
Received l0 November 1995; accepted 6 December 1995
Abstract
Stibnite ore at Wadi Abu Quraiya, situated in the central Eastern Desert of Egypt has been subjected to petrographical, mineralogical, infrared, X-ray diffraction, chemical and spectral analyses. Hydrometallurgical treatment based on leaching with acids, precipitation and electrode- position of metal values from the ore have been developed. Studies to investigate suitable electrolytic baths for the cathodic deposition of metallic antimony either directly from the leach liquor or in the presence of complexing agents have been carded out. The influence of various factors on the electrodeposition process of the element from its electrolyte solutions is discussed. Advantages of the flowsheet and various approaches depending on convenient electrolytes for the deposition of antimony from the stibnite ore have been investigated. The results of spectrophoto- metric and chemical analyses revealed that the purity of the metal is > 99%.
Interactive, touch-based, and accessible on-the-go – these define the future of all applications in this age of smartphones and tablets. zingGo, from SBL, offers an ideal platform to leverage these new age devices to provide an unparalleled interactive experience at multiple customer touchpoints. Encompassing zingGo Pad, zingoGo Kiosk, and zingGo software, the zingGO platform currently provides solutions for the hospitality, education, healthcare, and travel and tourism industries.
http://www.sblcorp.com/solutions/zingGo.php
Electro-Thermal and Semiconductivity Behaviour of Natural Sintered Complex Ca...Al Baha University
The polymetal (Zn, Pb, Fe, Ca, Mg, Cd, Ba, Ni, Ti, and SiO2) complex Umm-Gheig carbonate ore is subjected to sintering treatment at 573, 773, 973 and 1273 K respectively for four hours. Chemical, spectral, X-ray and differential thermal analyses are applied for the native ore as well as for the samples preheated and sintered. The I-V characteristics, bulk density (Db), percent shrinkage (%S), activation energy (Ea) and energy gap (Eg) are established for the sintered ore. The electrical conductivity (), thermal conductivity (K) and thermoelectric power coefficient () have been investigated as a function of applied temperature for the sintered ore materials. The electrical and thermal measurements show that the sintered ore has semiconductivity behaviour with temperature. The electrical conduction is mainly achieved by electrons or n-type. As the sintering temperature (Ts) increases the conduction of the ore is also increased owning to the recombination process takes place between the electrons and holes. Electrons hopping between Fe2+ and Fe3+ are the main charge carriers. The formation of Fe3O4 at high sintering temperature acts as an active mineralizer, thus inducing an increased degree of crystallinity and the more ordered crystal structure is produced.
Keywords
Electrolytic recovery of antimony from natural stibnite ore
Loutfy H. Madkour a, *, Ibrahim A. Salem b
a Chemistry Department, Faculty of Science, Tanta University, Tanta, Egypt b Geology Department, Faculty of Science, Tanta University, Tanta, Egypt
Received l0 November 1995; accepted 6 December 1995
Abstract
Stibnite ore at Wadi Abu Quraiya, situated in the central Eastern Desert of Egypt has been subjected to petrographical, mineralogical, infrared, X-ray diffraction, chemical and spectral analyses. Hydrometallurgical treatment based on leaching with acids, precipitation and electrode- position of metal values from the ore have been developed. Studies to investigate suitable electrolytic baths for the cathodic deposition of metallic antimony either directly from the leach liquor or in the presence of complexing agents have been carded out. The influence of various factors on the electrodeposition process of the element from its electrolyte solutions is discussed. Advantages of the flowsheet and various approaches depending on convenient electrolytes for the deposition of antimony from the stibnite ore have been investigated. The results of spectrophoto- metric and chemical analyses revealed that the purity of the metal is > 99%.
