Phase equilibria in the Chalcocite/Metallics Cotectic region of the Ni-Cu-S system

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Laurentian University, School of Engineering , Sudbury, Ont
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The copper–sulphur equilibrium phase system is relatively complicated. Beforeonly two binary sulphide minerals of copper were known, chalcocite, Cu 2 S, and covellite, CuS.

Although it was known that chalcocite forms solid solutions up to the composition Cu 18 S, the mineral digenite of the same composition was only described in For thousands of years the mineral chalcocite (pronounced KAL-kuh-site) has been a highly prized source of copper.

Its chemical composition is % Cu and % S. In some areas of the interfacial region the precipitates are rooted to the Ni–Cr end-member. This reaction morphology indicates the existence of the three-phase equilibria TiNi 3 +Cr ss +Ni ss and TiNi 3 +Cr ss +TiNi in the Ni–Cr–Ti system at this by:   Abstract.

Phase equilibria in the quaternary Ni-Re-Nb-Cr system at K have been determined by using the graph method combined with equilibrated alloys that were characterized with electron probe microanalysis and x-ray diffraction by: 4. The isothermal phase equilibria were established at the temperature of °C, which is lower than the temperatures of the major transformation observed in the Pr–Co–In sintered magnets [2] (those transformations were additionally studied for a selected polythermal section).Cited by: 7.

Phase equilibria of the Na,K,Mg,Na,K,Mg,Ca//SO 4,Cl-H 2 O system are studied at 50°C via translation in the crystallization range of glaserite (3K 2 SO 4 Na 2 SO 4).It is found that glaserite as the equilibrium phase of the investigated system at 50°C participates in the formation of 21 invariant points, 21 monovariant curves, and 34 divariant by: 2.

Thirty-two alloys were prepared for the °C phase equilibria study with compositions as shown in Fig. 1 and Table 1. Fig. 2 shows the backscattered electron image (BEI) micrograph of alloy 4 (Sn– at.% Zn– at.% Cu) annealed at °C for 2 by: A review of phase equilibria and thermodynamic data of Ni-(As, Se)-S and Cu-(As, Bi, Pb, Sb, Se, Te, Nb, Zn, Mo)-S systems was done.

Particular emphases were given to the compilation and refine of. EVANS: COPPER COORDINATION, LOW CHALCOCITE AND DII]RLEITE Fig. Phase diagram for the system Cu-S in the low temperature region near Cu2S adapted from Potter ().

Single-phase regions are shaded. The crystallographic CulS ratios in djurleite are indicated by arrows on the abscissa. on a knowledge of their crystal structures, and theFile Size: 1MB. sensu stricto is nearly stoichiometric C u S.

2 Chalcocite Low- or - chalcocite is orthorhombic (actually monoclinic, according to Evans, ) while high- or 3-chalcocite is hexagonal. The transition temperature is °C. Djurle () recognized an orthorhombic phase of composition about Cu^ ggS.

Tomeoka K, Ohmasa M, American Mineralogist, 67 () p, The modulated structure of cubic Cu9BiS6, the alpha phase View Additional jPOWD Structure files for Chalcocite [ 1 ] [ 2 ].

tational relationship between coexisting djurleite and chalcocite is where []* is parallel to [00]0, and []* is parallel to one of the () or () directions djurleite. Ifboth djurleite and chalcocite occur in a sample, chalcocite easily converts to djurleite under the File Size: 1MB.

Excellent specimen of bluish-metallic chalcocite crystals in complex cluster fully crystallized on all sides. The chalcocite crystals are well formed and very distinct.

Good blue color. Phase Equilibria and Thermodynamics of the System Zn- As-Cu-Pb-S at Temperatures Below K. Chalcocite Cu2S c Mineral Data Publishing, version 1 Crystal Data: Monoclinic, pseudo-orthorhombic.

Point Group: 2/m or m. Crystals are short prismatic [], thick to tabular {}, to 12 cm across, and prismatic [], to 25 cm long; {} is striated k []. Massive, compact, fine powdery. Twinning: Common on {} yieldingFile Size: 63KB. Chalcocite is sometimes found as a primary vein mineral in hydrothermal veins.

However, most chalcocite occurs in the supergene enriched environment below the oxidation zone of copper deposits as a result of the leaching of copper from the oxidized l class: Prismatic (2/m), (same H-M symbol).

The mean values and 1-sigma variations for supergene enrichment chalcocite are, for sedimentary copper chalcocite are (), and for hypogene chalcocite is ().Although the three populations show considerable overlap in the weakly fractionated range, 64% of the sedimentary copper measurements are less than, and 65% of the chalcocite from supergene enrichment has values greater than + by: 2.

In this work, phase relations and thermal stabilities of equilibrium phases in the Cu-Ni-S system have been reviewed. The calculated phase diagram of Cu-Ni system has been validated. Chalcocite Ore Zones at Las Minerale. Significant quantities of the copper mineral cuprite (cuprite contains % Cu metal), appears to be associated with the Las Minerale native copper and chalcocite ore zones.

Cuprite was rarely identified during geological logging of both RC and diamond drilling during exploration and infill drilling at LasFile Size: 2MB.

A secondary mineral in or near the oxidized zone of copper sulfide deposits.

Description Phase equilibria in the Chalcocite/Metallics Cotectic region of the Ni-Cu-S system EPUB

Hexagonal above °C ('High-chalcocite'). Easily confused with djurleite. Small amounts of the Cu 2 S phase may deposit from supersaturated volcanic gas, as shown in an experiment (Africano et al., ; o C deposition range for this particular experiment).

Request PDF | The Cu-Ni-S System and Its Significance in Metallurgical Processes | Due to increasing complexities of raw materials for base metals production the conventional pyrometallurgical. chalcocite[′kalkə‚sīt] (mineralogy) Cu2S A fine-grained, massive mineral with a metallic luster which tarnishes to dull black on exposure; crystallizes in the orthorhombic system, the crystals being rare and small usually with hexagonal outline as a result of twinning; hardness is on Mohs scale, and specific gravity is Also known.

Phase Equilibria and Thermal Analysis of Si–C–N Ceramics Article in Journal of Alloys and Compounds (2) May with 62 Reads How we measure 'reads'. Abstract. Phase equilibria of the Na,K,Mg,Ca‖SO 4,Cl-H 2 O system at 50°C in the astrakhanite (Na 2 SO 4 MgSO 4 4H 2 O) crystallization region were studied using the translation method.

Astrakhanite was found to be involved, as an equilibrium phase of the title system, in 35 divariant fields, 39 monovariant curves, and 22 invariant by: 2. The copper mineral chalcocite, Cu2S, can be converted to copper simply by heating in air Cu2S(s) +02(g)-> 2Cu(s) + SO2(g) 3rd attempt Part 1 (1 point) How much Cu2S is needed to make g Cu.

g Cu2S used Part 2 (1 point) How much SO2 is produced. g SO2 produced. Chalcocite, sulfide mineral that is one of the most important ores of copper. Valuable occurrences include deposits of sulfide minerals at Ely, Nev., and Morenci, Ariz., where other components of the original rock have been dissolved away; it is also found with bornite in the sulfide veins of.

The phase equilibria and crystal structures of mixed oxides in the ternary system La 2 O 3-Mn 3 O 4-NiO are studied at °C in projection of the La-Mn-Ni-O phase diagram at °C and \(p_{O_2 }\) = × 10 5 Pa onto the metal-composition triangle is found to comprise 12 phase fields.

The lattice parameters of La 2 NiO 4 (sp. I4/mmm), La 3 Ni 2 O 7 (sp. Cmcm), La 4 Ni 3 Cited by:   Using the CALPHAD method, a thermodynamic model of the Ti-Si-B-C quaternary system is developed for the first time.

Based on calculations of phase equilibria, a way for tetrahedration of this system is proposed.

Details Phase equilibria in the Chalcocite/Metallics Cotectic region of the Ni-Cu-S system FB2

Fragments of the phase diagrams that have not been studied previously are calculated for the boundary ternary systems, with calculations for Si-B-C being Cited by: 1. Copper occurs in nature in many forms; chalcocite (Cu2S) is one form found in copper ores located in the western United States.

To recover metallic Cu (for pennies, wire, and many other uses) chalcocite is leached in an acid solution of ferric sulfate to form cupric sulfate. Microstructural Subsequence and Phase Equilibria in an Age-Hardenable Cu-Ni-Si Alloy Satoshi 1,*Semboshi, Mikio Ishikuro1, Akihiro Iwase 2 and Takayuki Takasugi2 1Institute for Materials Research, Tohoku University, Sendai –, Japan 2Department of Materials Science, Osaka Prefecture University, Sakai –, Japan We investigated the microstructural subsequence and phase.

Chalcocite is an important copper mineral ore. It has been mined for centuries and is one of the most profitable copper ores.

Download Phase equilibria in the Chalcocite/Metallics Cotectic region of the Ni-Cu-S system FB2

The reasons for this is its high copper content (67% atomic ratio and nearly 80% by weight) and the ease at which copper can be separated from sulfur.Where Chalcocite is mined Cleavage and fracture Chalcocite will be mined in Red Chris mine 80 km from Dease Lake.

The mine is not yet in the proses of mining but they are in construction of the mine. Chalcocite has a conchoidal fracture and a prismatic cleavage. Alaskan Minerals.the solid phase CuS forms after the transfer of 50% of copper into the solution [2].

Two distinctive stages of the reaction have also been found by Warren [3] in the process of pressure-leaching of chalcocite in sulfuric acid. Stanczyk and Rampacek [4] have also observed.