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Formation of Sphalerite ZnS Deposits in Natural Biofilms

Dec 01 2000 0183 32 Abundant micrometer-scale spherical aggregates of 2- to 5-nanometer-diameter sphalerite ZnS particles formed within natural biofilms dominated by relatively aerotolerant sulfate-reducing bacteria of the family Desulfobacteriaceae The biofilm zinc concentration is about 106 times that of associated groundwater 009 to 11 parts per million zinc...

Extreme 34S depletions in ZnS at the Mike gold deposit

We identified submicrometer-sized framboidal sphalerite ZnS below the base of supergene oxidation in a Carlin-type gold deposit of Eocene age in Nevada United States where the framboidal sphalerite forms a blanket-like body containing gt 400 000 metric tons of zinc Framboidal sphalerite...

Determination of Zinc Sulfide Solubility to High

The solubility of ZnS at 100 176 C and 150 176 C was measured by 5 The measurements were carried out in a titanium flow-through hydrothermal reactor As starting material they used ZnS confirmed to be pure sphalerite structure using X-Ray Diffraction XRD The ZnS was...

INVERSION BETWEEN SPHALERITE AND WURTZITETYPE

sphalerite wurtzite where there is a small amount of GaS component and adops the u/urtzite structure where there is a greater proportion of the GaS and FeS components A mixed sphalerite wurtzite type occurs in the GaS-rich portion of the ZnS-GaS join and slightly extending toward the FeS composition...

Recycling process water in sulfide flotation Part A

The beneficiation of sulfide minerals requires a process known as froth flotation which separates sulfide minerals and gangue minerals based on their floatability differenc ZnS and FeS 2...

Computer simulation in hydrothermal systems with allowance

To enhance the computer simulation of hydrothermal processes using the HCh program package an external ZnS_FeS module has been created on the basis of a nonideal asymmetric model of sphalerite solid solution FeS and ZnS activity coefficients computed in line with this model within a temperature range 200-350 176 C lead to the decrease in FeS mole fraction X...

Compositional zoning in sphalerite crystals

Sphalerite the cubic polymorph of ZnS exhibits a wide range of compositional variations in natural specimens eg Pattrick et al 1993 1998 Axelsson and Rodushkin 2001 where other metal cations can replace Zn in the tetrahedral site One consequence is that sphalerite is the major source not only of Zn but also of Cd In Ge and Ga...

The distribution and composition of sulfide minerals at

By use of the phase diagram of the ZnS-FeS2-S system the temperature of formation of sphalerite 6-9 percent FeS by weight associated with pyrite in the No 2 mine is indicated to be greater than 320 176 C Sphalerite associated with pyrite in the No 3 mine contains 2-3 percent FeS by weight...

Sphalerite geobarometry of deformed sulphide ores from the

The C S A Mine is located near Cobar central New South Wal The copper-zinc-lead ores occur in Early Devonian rocks of the Cobar Super-Group Lower greenschist slate-grade metamorphism has developed elongate lenticular ore systems parallel to the extension down-dip lineation in cleavage FeS contents of sphalerites coexisting with pyrite and pyrrhotite outside and inside...

Thermodynamic Properties of Zn Fe S Solid Solutions at 850oC

The activity of ZnS and FeS in sphalerite at 850 C has been calculated from published data on the compositions of equilibrated pyrrhotite and sphalerite using the Gibbs-Duhem equation Although ZnS behaves more non-ideally than FeS the mixing is approximately symmetrical about x p2 s 05 The excess free energy of mixing at this composition...

Sphalerite with Pyrite and Galena 90 Geology

Sphalerite ZnS pyrite FeS 2 and galena PbS have at least one thing in common they are all metal sulfid Many ore minerals that is minerals that contain elements of such value that they are mined as ores to obtain those elements are sulfid The desired elements may be found in other minerals but perhaps those minerals are...

Interaction between sphalerite and pyrite and its effect

Interaction Between ZnS Py Its Effect on Surface Oxidation of ZnS - Free download as PDF File pdf Text File txt or read online for free sulphide...

Problems With Mining Sphalerite

Sphalerite - Wikipedia the free encyclopedia Sphalerite Zn Fe S is a mineral that is the chief ore of zinc It consists largely of zinc sulfide in crystalline form but almost always contains variable iron...

Kinetic study of sulfide leaching by galvanic interaction

The rates of dissolution of copper from chalcopyrite and zinc from sphalerite as single electrically isolated separate systems were compared with electrically contacting galvanically coupled systems involving CuFeS 2 /FeS 2 and ZnS/FeS 2 with and without bacteria and at temperatures of 30 and 55 176 C...

Pyrite Sphalerite

Visually pleasing combination specimen with mirror bright modified pyrite crystals intergrown with bright sphalerite crystals and a scattering of chalcopyrite Formulas Pyrite FeS 2 Sphalerite ZnS Chalcopyrite CuFeS 2 Status Sold Dimensions 80x52x60mm Size Small Cabinet S...

Collections de mineraux et de roches du dpartement des

Collection de Minéraux et de Roches du département des Sciences et de la Terre de l Université Paris Sud...

Crystal chemistry of Fe

The Fe solvus in sphalerite determined by optical microscopy and microprobe analysis are directly correlated with increasing temperature and decreasing sulfur fugacity controlled by solid-state buffers The increase of lattice parameters with Fe correlates with an increase of FeS independent of sulfur fugacity up to 10 mol FeS within ZnS...

Natural oxidation of coal tailings from Middelburg area

The mined coal is subjected to a beneficiation process whereby the less valuable fraction which cannot be processed economically is separated Pyrite FeS 2 2 375O 2 35H 2 Sphalerite ZnS...

Sphalerite blende Zn Fe S Zinc Iron Sulfide major

Download this stock image Sphalerite blende Zn Fe S Zinc Iron Sulfide major ore of zinc - DFPD4M from Alamy s library of millions of high resolution stock photos illustrations and vectors...

Thermodynamic

FeS ss boundary Sphalerite ss boundary Zn l Phase Boundaries at 1200K Itoh 1999 Wurtzite ss boundary Zn - S - Fe 1200 K 1 atm Rubenstein 1977 Sysoev et al 1967 1718 177 10 176 C Addamiano Dell 1957 Liquid Liquid 2 Liquid Liquid ZnS s2 Liquid Liquid 2 Liquid ZnS s2 ZnS s2 ZnS 2 s ZnS s ZnS 2 s Liquid ZnS 2 s Liquid...

Sphalerite Zn Fe S

Sphalerite Zn Fe S c 2001-2005 Mineral Data Publishing version 1 Crystal Data Cubic Point Group 43m Crystals tetrahedral dodecahedral typically complex and distorted curved and conical faces common to 30 cm...

Sphalerite geobarometry in the Cu

The pressure dependence in kb of the composition of sphalerite in equilibrium with pyrite and pyrrhotite with or without iss can be expressed for the temperature-independent portion of the sphalerite geobarometer as P = 4230 - 3210 log mole FeSBecause of the low solubility of copper in sphalerite in the four-phase assemblage below 650...

Chemical behaviour of sphalerite and arsenopyrite in

Mole FeS in Sphalerite FIG 2 Temperature-composition section along the ZnS-FeS join of the system ZnS-FeS-S sphalerite pyrite hexagonal pyrrhotine equilibria as a function of pressure in kbar Temperature-independent portion of the isobars is shaded Drawn from the data of Boorman...

Sphalerite Mineral Specimens for Sale

ZnS Size 85 x 5 x 6 cm - Sm Cabinet Tagged Ore Minerals Dark lustrous brown Sphalerite crystals to 3mm totally covering lumpy colloform growths of brassy Pyrite Neat specimen The W Fork Mine is located in the SE lead-district in Missouri and is also a Mississippi Valley Type deposit in...

Synthesis and phase studies on sphalerite solid solution

The solubility of copper and manganese into sphalerite and the phase relations around sphalerite solid solution have been studied in the systems Cu-Fe-Zn-S and Mn-Fe-Zn-S Copper content in iron rich sphalerite is about 7 mole CuS or more at 800 176 C and it decreases rapidly with decending temperature and also with decreasing iron content...

Commentary on the sphalerite geobarometer Pnrnsrr ny

Commentary on the sphalerite geobarometer Pnrnsrr ny Tour trrN III P B B-qnroN Jn L B WrccrNs US Geological Survey 959 National Center Reston ia 22092 U5A Ansrn-lcr The FeS content of sphalerite in assemblages with pyrite and pyrrhotite has been widely used and widely criticized as a geobarometer...

Study of Bacterial Attachment During the Bioleaching of

Nov 11 2010 0183 32 Three different mineral sulfides were bioleached chalcopyrite CuFeS 2 sphalerite ZnS and pyrite FeS 2 A mixed culture of mesophilic bacteria Acidithiobacillus and Leptospirillum spp was tested at 35 176 C and thermophilic bacteria Sulfolobus spp were tested at 68 176 C The results confirmed that a relationship exists between...