Journal ArticleDOI
Thermodynamics of roasting arsenopyrite
Nirupam Chakraborti,D. C. Lynch +1 more
TLDR
In this paper, the authors evaluate the results of roasting both natural and synthetic arsenopyrite (FeAsS) in inert, reducing, and oxidizing atmospheres at 798 and 873 K.Abstract:
Existing thermodynamic data for the Fe-As-S-0 system were evaluted and predominance area diagrams for that system were constructed at 798 and 973 K. Isopleths for the As/S and As/O atomic ratios in the vapor phase have been added to the diagrams by solving the complex equilibria. These modified diagrams were used to evaluate the results of roasting both natural and synthetic arsenopyrite (FeAsS) in inert, reducing, and oxidizing atmospheres at 798 and 873 K. Conditions leading to the retention of As as As2O5(s) and FeAsO4(s) were also reviewed. The experimental results indicate that both reducing and oxidizing atmospheres are more effective in the removal of As than an inert atmosphere. In a reducing atmosphere arsenic sulfides are evolved and the percentage of As removal increases with decreasing PO
2The greatest percent of As removal occurred with highly oxidizing atmospheres which generated As4O6 vapor.read more
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Reference EntryDOI
Arsenic and Arsenic Compounds
TL;DR: In this article, the authors present a survey of the physical and economic aspects of the use of arsenical compounds in the production of metal and coal, as well as safety measures for safe disposal.
Journal ArticleDOI
A chemistry on the volatility of some trace elements during coal combustion and pyrolysis
Jie Wang,Akira Tomita +1 more
TL;DR: In this paper, the vaporization behavior of nine trace elements including beryllium, vanadium, chromium, manganese, cobalt, nickel, zinc, arsenic, and lead during coal combustion and pyrolysis below 1150 °C was investigated.
Journal ArticleDOI
Large scale smelting of speiss and arsenical copper at Early Bronze Age Arisman, Iran
TL;DR: In this paper, the authors report analyses of different slag types found at the Early Bronze Age site of Arisman in North-West Iran, showing that both speiss, an iron-arsenic alloy, and arsenical copper were produced side-by-side at the same site but using different ores and processes.
Journal ArticleDOI
Reducing epistemological uncertainty in life cycle inventory
B. von Bahr,Bengt Steen +1 more
TL;DR: A methodology is suggested where the most frequent LCI-emissions are considered to have three different phases; primary emission mechanism, conversion in process, and end-of-pipe measures, and its governing parameters, which regulates the amount of the emission.
Journal ArticleDOI
Recovery of gold from sulfide refractory gold ore: Oxidation roasting pretreatment and gold extraction
TL;DR: In this article, a novel method for gold recovery from refractory gold ore was proposed with the purpose of improving recovery efficiency of gold and reducing environmental pollution, and the method consisted of two stages roasting for arsenic and sulfur removal, gold recovery by thiourea leaching, followed by an enhanced chlorination roasting, and gold recovery in the presence of pyrite.
References
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Book
CRC Handbook of Chemistry and Physics
TL;DR: CRC handbook of chemistry and physics, CRC Handbook of Chemistry and Physics, CRC handbook as discussed by the authors, CRC Handbook for Chemistry and Physiology, CRC Handbook for Physics,
Book
Selected Values of the Thermodynamic Properties of the Elements
TL;DR: In this paper, methods of evaluation, atomic weights, fundamental constants, symbols and units, general references, and properties of the elements are presented. But they do not specify the properties of elements.
Book
Extractive metallurgy of copper
A.K. Biswas,W.G. Davenport +1 more
TL;DR: Inco flash smelting as discussed by the authors is an outokumpu process that converts matte copper ores into slag and then converts slag to slag-free copper.
Book
Chemical and engineering thermodynamics
TL;DR: In this paper, the Gibbs Free Energy and Fugacity of a component in a Mixture is estimated, and the equilibrium and stability of one-component systems are discussed, as well as the properties of water and steam.