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Published in Anthony Peter Gordon Shaw, Thermitic Thermodynamics, 2020
There are three general reactions that may occur when sulfides are heated in the presence of oxygen or when sulfides combust in oxygenated atmospheres (equations 5.80–5.82). Sulfates and oxides are the most common metal-bearing oxidation products, and oxides are more probable than sulfates at extreme temperatures. Sometimes, elemental metals are produced, but only when their sulfates and oxides are less stable than sulfur dioxide [70]. Under the right conditions, silver and mercury can be liberated by roasting acanthite (Ag2S) and cinnabar (HgS) in air.
Electrical Equipment in a Corrosive Environment
Published in Bella H. Chudnovsky, Transmission, Distribution, and Renewable Energy Generation Power Equipment, 2017
The fact that pure silver whiskers grow from silver sulfide is confirmed in the study of in situ high-temperature XRD study of silver sulfide Ag2S in Ref. [40] to better understand the polymorphs of Ag2S on heating. Powder of Ag2S was synthesized in a standard chemical reaction, analyzed by XRD and identified as β-Ag2S, acanthite.
Gold and silver minerals in ore facies of Alexandrinskoye VHMS deposit (Southern Urals)
Published in Adam Piestrzyński, Mineral Deposits at the Beginning of the 21st Century, 2001
S.G. Tessalina, V.V. Maslennikov, J.-J. Orgeval
The results of 49 chemical analyses of massive ore are plotted on a logarithmic diagram Au–Ag (Fig. 1). Three distinct fields are recognisable corresponding to the leached zone, “intermediate” zone and Cu-Zn sulphide enrichment zone. The contents of gold decrease in this order and contents of silver conversely increase (Table 2) becoming elevated (≥50 ppm) in the bornite-bearing Cu-Zn sulphide enrichment zone. There is an interesting “double” correlation between Au and Ag contents – as a whole inverse in the ore-body, and direct within both the leached and “intermediate” zones. In the leaching zone, gold is probably present as submicroscopic inclusions in pyrite. In the Cu-Zn enrichment zone gold grade distribution is dishomogeneous. Rare nugget-like gold patches, up to 1 cm size, were observed in pyrite ore clasts. Silver concentrations in bornite and chalcocite are elevated (up to 2-3%). Intimate intergrowths stromeyerite-chalcocite are associated with chalcopyrite–bornite–galena mineralization (Table 1, an. 5). Acanthite prevails as silver-carrier at the top of the ore-body in the sulphide oxidation zone, where it coexists with galena and hematite in the barite ore.
Structural and optical studies of silver sulfide nanoparticles from silver(I) dithiocarbamate complex: molecular structure of ethylphenyl dithiocarbamato silver(I)
Published in Journal of Sulfur Chemistry, 2020
Peter A. Ajibade, Nandipha L. Botha
Metal nanoparticles are of interest and can be prepared and functionalized to enhance their applications especially in biotechnology and targeted drug delivery [1–4]. Metal sulfide nanoparticles are versatile, broad and exciting class of inorganic compounds [5–7]. Interest in Group 11 metal complexes are due to their properties and diverse structural chemistry [8]. Silver sulfide is a semiconductor with unique properties such as enhanced optical nonlinearity and high photoluminescence that are useful in the design of new optoelectronic devices [9]. Potential applications of nanostructure materials depend on their crystallinity, porosity and hierarchical architecture [10] as well their morphologies [11–13] that can be controlled by capping agents or subtle changes in reaction conditions [14]. Among techniques used for the synthesis of silver sulfide nanoparticles, the thermolysis of silver(I) dithiocarbamate complexes as single source precursors have proven to be suitable for the synthesis of acanthite silver sulfide nanoparticles [15–18].
Research on prediction model of ore grinding particle size distribution
Published in Journal of Dispersion Science and Technology, 2020
Zhou Wentao, Han Yuexin, Li Yanjun, Yang Jinlin, Ma Shaojian, Sun Yongsheng
The cassiterite polymetallic sulfide ore, as one of the raw materials for test, is from Peak Mining Co., Ltd., a large plant in Guangxi province of China, and the lead-zinc ore is from Fozichong Mining Co., Ltd., a beneficiation plant in Guangxi of China. The raw material is naturally dried after surface cleaning. The main components of the cassiterite polymetallic sulfide ore are pyrrhotite and sphalerite, amounting to 90% of the total mineral content; the lead minerals are mainly jamesonite; the antimony minerals include slight amounts of gudmundite, native antimony and hypargyrite; silver minerals are mainly freibergite, native silver and acanthite; tin minerals are mainly cassiterite, traces amount of stannite and kolbeckine; others metal sulfide minerals are mainly pyrite, arsenopyrite, chalcopyrite and molybdenite; gangue minerals are mainly mica, quartz, potassium feldspar and kaolin. Lead minerals in lead-zinc ore are mainly galena and trace jamesonite; zinc minerals are sphalerite; other metal sulfide minerals are mainly pyrrhotite, pyrite and a small amount of chalcopyrite; metal oxide minerals are mainly a small amount of magnetite and rutile; gangue minerals are mainly quartz, epidote, chlorite, calcite and feldspar.
Acidophilic bioleaching: A Review on the Process and Effect of Organic–inorganic Reagents and Materials on its Efficiency
Published in Mineral Processing and Extractive Metallurgy Review, 2019
Mohammad Jafari, Hadi Abdollahi, Sied Ziaedin Shafaei, Mahdi Gharabaghi, Hossein Jafari, Ata Akcil, Sandeep Panda
Over the past few years, some investigations have been carried out to study the galvanic interaction. Nicol and Lázaro (2002) studied the galvanic interaction phenomenon on pyrite, arsenopyrite, and chalcopyrite. Abraitis et al. (2004) studied the complex systems containing some base MS (chalcopyrite, galena, and sphalerite) with pyrite. They showed that the rates of dissolution of chalcopyrite, galena, and sphalerite in the presence of pyrite were determined, respectively, as 18, 31, and 1.5 times more rapid than in single-mineral experiments. Aghamirian and Yen investigated the galvanic interactions between different mineral sulfides and noble metals such as gold. They showed that galvanic interaction accelerates the corrosion of gold in the solution (Aghamirian and Yen 2005). Cruz et al. (2005) studied the galvanic effect between different mineralogical phases by voltammetric techniques in different mineral concentrates containing pyrite, sphalerite, galena, and acanthite. They showed if a negligible amount of impurity was presented in the solution, it may affect the pyrite interaction.