POLYMORPHISM IN BORNITE N. Monrlroro* AND G.
Frueh (1950) investigated bornite crystals from Bristol, Connecticut, and from Butte, Montana, and produced r-ray, thermal, and electrical evidence indicating that bornite can exist in both a low- and a high-tem-perature form. Frueh considers the structural difierence between the forms to be one of order-disorder. The disorder becomes …
Exsolution of chalcopyrite from bornite-digenite solid
a Optical image of chalcopyrite "exsolutions" in bornite from Olympic Dam, South Australia. Part of the bornite is being replaced by chalcocite. Photomicrograph by K. Ehrig. b Phase relationships at 300 °C in part of the Cu-Fe-S system, modified from Sugaki et al. ().Pure stoichiometric phases are shown as stars, and solid solutions as shaded …
Bornite
Bornite crystals usually tends to be small, black, ugly and not very sharp. Well, this specimen shows is colorful nature due to an iridescent alteration of a thin covering, its …
A review on bornite (bio)leaching
Three polymorphs are reported for synthesized as well as natural bornite referring to their formation temperature: (a) high-temperature form (b) metastable form or …
Ball milling as an effective route for the preparation of …
Bornite, Cu 5 FeS 4, is a naturally-occurring mineral with an ultralow thermal conductivity and potential for thermoelectric power generation.We describe here …
Ball milling as an effective route for the preparation of …
Bornite, Cu 5 FeS 4, is a naturally-occurring mineral with an ultralow thermal conductivity and potential for thermoelectric power generation.We describe here a new, easy and scalable route for synthesising bornite, together with the thermoelectric behaviour of manganese-substituted derivatives, Cu 5 Fe 1−x Mn x S 4 (0 ≤ x ≤ 0.10). …
Bornite
Bornite crystals usually tends to be small, black, ugly and not very sharp. Well, this specimen shows is colorful nature due to an iridescent alteration of a thin covering, its crystals are pretty huge and extremely sharp for the species. You can appreciate its beauty in the photo. Plus the specimen is a ...
Sulfide bornite thermoelectric material: natural mineral …
bornite (Cu 5FeS 4), as a widespread natural mineral composed of non-toxic and earth-abundant elements. Bornite has ultralow thermal conductivity, adjustable electrical transport properties, and enhanced stability under large electric currents, showing a great potential as a new economical and eco-friendly thermoelectric material. ...
Leaching of Bornite Produced from the Sulfurization of …
The leaching experiments with the synthetic bornite investigated the influence of the initial ferric ion concentration and temperature on copper dissolution. The reference condition was a leaching experiment performed at 353 K (80 °C), with 1 mol/L sulfuric acid, 2 mol/L sodium chloride, and 0.5 mol/L ferric iron.
(PDF) Magnetic structure of bornite, Cu5FeS4
Abstract. Neutron powder diffraction techniques have been used to investigate the magnetic structure of bornite, Cu5FeS4. Below the antiferromagnetic ordering temperature of 76 ± 2 K extra peaks ...
Thermodynamic and Kinetic Mechanisms of …
A thermodynamic and kinetic model is proposed to explain the formation of bornite, chalcopyrite, and magnetite during partial roasting of enargite-containing copper concentrates. The proposed mechanism involves solid–solid–gas and solid–gas reactions between chalcocite, pyrrhotite, gaseous sulfur, and oxygen. Bornite formation could be …
Heat capacity and entropy of bornite (Cu 5 FeS 4 ) …
Heat capacities of synthetic bornite (Cu 5 FeS 4) have been measured by quasi-adiabatic calorimetry between 5 and 351 K and between 338 and 761 K by differential scanning calorimetry.The heat capacity of bornite exhibits a lambda -type anomaly at 65+ or -1 K associated with the antiferromagnetic ordering of the spins of the Fe (super 3+) ions.
Controlled Synthesis and Exploration of CuxFeS4 Bornite …
Plasmonic semiconductor nanocrystals (NCs) are a new and exciting class of materials that enable higher control of their localized surface plasmon resonance (LSPR) than metallic counterparts. Additionally, earth-abundant and non-toxic materials such as copper iron sulfides are gaining interest as alternatives to heavy metal-based …
The critical degree of bornite surface oxidation in flotation
1. Introduction. The copper-iron sulphide mineral bornite (Cu 5 FeS 4) is a ternary semiconducting material that crystallises in the orthorhombic system and one of the main valuable sources of commercial copper after chalcopyrite (CuFeS 2) and chalcocite (Cu 2 S) in chronology of economic importance (Buckley et al., 1984).Bornite is also one …
Leaching of bornite in acidified ferric chloride solutions
In an acidified ferric chloride solution, bornite leaches in two stages of reaction with the first being relatively much more rapid than the second; the first terminates at 28 pct copper dissolution. The first-stage dissolution reaction is electrochemical and is mixed kinetics-controlled; ferric-ion transfer through the solution boundary layer and reduction on the …
A review on bornite (bio)leaching
Three polymorphs are reported for synthesized as well as natural bornite referring to their formation temperature: (a) high-temperature form (b) metastable form or transition form (c) low-temperature form (Morimoto and Kullerud, 1961) (Table 2).The schematic diagram of the three forms of bornite is shown in Fig. 1.Although there are …
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