The pyrrhotite material was handpicked from an 80 cm thick massive lense of sulphides in the open pit of the Akselberg deposit, and subsequently crushed using a jaw crusher with 3 mm discharge opening. To minimise the degree of oxidation of the particle surfaces, the crushed material were stored in a freezer until used in the experiments.
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Pyrrhotite is less floatable than both chalcopyrite and pentlandite in both lime and soda ash systems. In the lime system, pyrite depression in the Timmins ore is almost the same as the pentlandite depression, but unlike pentlandite it remains to be non-floatable even in the soda ash system. Possible mechanisms have been discussed in …
Compared to the di-sulphides pyrite and marcasite, FeS 2, the S content of pyrrhotite is ≈ half, so it tends to occur in deep deposits or linked to metamorphic devolatilization. Another consequence of pyrrhotite's composition and structure is its instability in shallow conditions, particularly under weathering.
Pyrrhotite becomes an issue in concrete manufacturing if pyrrhotite-bearing stone is crushed up and used as filler for the concrete. Thus, identifying where it may occur can help identify where there may …
Effect of lead nitrate addition on the leaching of a pyrrhotite-bearing gold ore (Cyanidation: pH 11.2, 380ppm NaCN, 8ppm O 2, 32h) Figure 5 illustrates the reaction of cyanide with chalcopyrite ...
High-purity chalcopyrite and pyrrhotite bulk samples were obtained from Yunnan Province, China. Laboratory jaw crusher and porcelain ball mill were used to crush and reduce sample size. Standard sieves were finally used to classify these mineral powders. Prepared samples were placed in vacuum bags and vacuumed to prevent …
Sulphur mobilization in pyrite-rich (FeS 2) wall-rocks can occur when a reducing fluid converts pyrite to pyrrhotite (Fe 1-x S) with the excess sulphur dissolving …
Pentlandite is the dominant Ni-hosting ore mineral in most magmatic sulfide deposits and has conventionally been interpreted as being entirely generated by solid-state exsolution from the high-temperature monosulfide solid solution (MSS) (Fe,Ni) 1–x S. This process gives rise to the development of loops of pentlandite surrounding pyrrhotite …
Pyrrhotite (Fe 1-x S) is an unstable form of iron sulfide [4] and its presence in aggregate has been linked to concrete degradation in various areas around the world [5] [6] [7][8]. In the ...
Pyrite and pyrrhotite are minerals known as iron sulfides. When iron sulfides are exposed to water and oxygen, a series of chemical reactions breaks down the iron sulfides and forms new minerals called sulfates. These sulfates take up more space than the original iron sulfides. As they grow, the new sulfate minerals push against the surrounding rock, …
Two pure pyrrhotite samples were obtained from the University of Tehran Mineralogy laboratory. Bulk samples were crushed by a laboratory cone crusher (Notashsanat Co, Iran) and dry-milled to −100 μm. Particle size distribution was determined via a laser particle sizer (Fraunhofer Hydro, 2000S), and the results are shown in Fig. …
Within the Crystal Lake taxites, much of the 'contact' pentlandite occurs at the boundary between early MSS, and the later chalcopyrite-pyrrhotite ± cubanite assemblage (Fig. 7c, d, h, 11a).
The crushing equipment included a jaw crusher (XPC-100 × 150), and the screening equipment included a vibrating screen (Analysette 3). ... As for pyrrhotite, it has the lowest Mohs hardness and the highest …
Here, we report pyrrhotite Fe1−xS microcubes as a new anode material for this exciting energy storage technology. The anode delivers a reversible capacity of 418 mAh g−1 with an initial ...
Pyrrhotite is the main sulphide mineral followed by chalcopyrite and pentlandite. The sulphide grain size is fine to medium. In near surface parts of the mineralisation, ... Crushing consists of 2 stages; primary crushing using a CG820 gyratory crusher. The secondary and tertiary crushing is done in two MP800 …
Cobalt-bearing Pyrrhotite: A cobalt-bearing variety of pyrrhotite from Russia. Nickel-bearing Pyrrhotite: A nickel-bearing variety of pyrrhotite from Pennsylvania (USA). Pyrrhotite Healing Properties. You can use most crystals as healing stones to support your physical, emotional, and spiritual body.
Iron sulfide minerals, which include marcasite (FeS 2), pyrite (FeS 2), greigite (Fe 3 S 4), and pyrrhotite (Fe 7 S 8), are common in the Earth's crust.Iron sulfide minerals have many ...
Pyrrhotite is an iron bearing sulphide mineral that can be considered as ... sample was crushed on a laboratory jaw crusher to 100 percent passing 1 mm and split into representative aliquots.
We have compiled the trace element concentrations in pyrrhotite, pentlandite, chalcopyrite, and pyrite from magmatic Ni-Cu-PGE ore deposits with the aim of understanding their petrogenesis and whether these minerals can be used as indicator minerals. Among the samples, there are some of the most studied world-class Ni-Cu- …
Pyrrhotite has a disordered NiAs structure (Ward, 1970) that results from having a nonstoichiometric composition, Fe 1−x S, where x varies from 0 (i.e., FeS) to 0.125 ... Sample preparation followed methods outlined by Nicholson et al. (1988). Samples were crushed in a jaw crusher and further ground in a ceramic ball mill. A CSC Scientific Sieve.
Since pyrrhotite is unlikely the only sulfur mineral present, this value should be considered a maximum estimate of pyrrhotite concentration. This test simply confirms the presence of the mineral pyrrhotite in the sample(s) provided, estimates the maximum concentration and compares it (them) to the results obtained from other similar samples.
The unit cell of monoclinic and hexagonal pyrrhotite are shown in Fig. 1 [1].Fe content of monoclinic pyrrhotite is between 46.5% and 46.8%, and that of hexagonal pyrrhotite is between 47.4% and 48.3% [41].The distance of Fe–S is in the range of 0.237–0.272 nm, and the average distance is 0.250 nm [28].As shown in Fig. 1, the …
Pyrrhotite with pen for scale. From the mineral collection of Brigham Young University Department of Geology, Provo, Utah, Mineral Specimens 867. Courtesy of the U.S. Geological Survey Denver Library Photographic Collection. (Photo by Andrew Silver.) Pyrrhotite is found in a wide range of hydrothermal deposits. It is often associated with …
Below, we briefly outline the testing methods used to test for pyrrhotite in aggregate. Notably, as Table 1 shows, there is no simple method of determining an aggregate …
Pyrrhotite is a mineral that ended up in certain batches of concrete poured into foundations of homes. It is considered a geohazard in concrete because over time – typically 15 to 20 years – pyrrhotite begins to expand and break apart in …
Magnetite was also highly locked with pyrrhotite in the fraction below 125 µm (2.36%). For pyrrhotite, the liberation degree was lower than those of valuable minerals, at 35.55% in the fraction smaller than 125 µm (Figure 16d). An important relation in binary particles is the association with pentlandite, which reached 26.15% for the …
Section snippets Synthesis of NPyr. Natural pyrite was obtained from Xinqiao Mine of Tongling City, Anhui Province, China, crushed in a jaw crusher, and sieved into particles of 250–425 µm.The pyrite particles were washed, by soaking in a 1% (v/v) HCl solution for 48 h, to remove any carbonate and iron oxide films formed on the surfaces.. …
Pyrrhotite: Tokonami M, Nishiguchi K, Morimoto N (1972) Crystal structure of a monoclinic pyrrhotite (Fe7S8) American Mineralogist 57 1066-1080: 1972: 0: 293: 0020728: Pyrrhotite: Liles D C, de Villiers J P R (2012) Redetermination of structure of 5C pyrrhotite at low temperature and at room temperature American Mineralogist 97 257-261: 2012
Pyrrhotite (Fig. 1.11) is an unusual iron sulfide with variable iron content [Fe (1−x) S (x=0–0.2)].The color ranges between bronze yellow and copper-red with black streak and metallic luster. The hardness varies between 3.5 and 4.5 on the Mohs scale and an average specific gravity of 4.6.
Pentlandite is the dominant Ni-hosting ore mineral in most magmatic sulfide deposits and has conventionally been interpreted as being entirely generated by solid-state exsolution from the high-temperature monosulfide solid solution (MSS) (Fe,Ni) 1–x S. This process gives rise to the development of loops of pentlandite surrounding pyrrhotite grains.
The deteriorating foundations are associated with a quarried rock that contains a mineral called pyrrhotite (Figure 2). Pyrrhotite is the second most common iron sulfide in nature, and it is found associated with pyrite, marcasite, magnetite, and chalcopyrite (CSA 2014). Even so, aggregate that contains pyrrhotite, an unstab…
Pyrrhotite Damage to a Basement and a Home Being Repaired Due to Pyrrhotite Damage. GAO found that highly affected towns lost more than $1.6 million in tax revenue in 2018 due to lost …
Magmatic sulfide deposits consist of pyrrhotite, pentlandite, chalcopyrite (± pyrite), and platinum-group minerals (PGM). Understanding the distribution of the chalcophile and platinum-group element (PGE) concentrations among the base metal sulfide phases and PGM is important both for the petrogenetic models of the ores and …
We have compiled the trace element concentrations in pyrrhotite, pentlandite, chalcopyrite, and pyrite from magmatic Ni-Cu-PGE ore deposits with the aim of understanding their petrogenesis and whether these minerals can be used as indicator minerals. Among the samples, there are some of the most studied world-class Ni-Cu- (Aguablanca, Duluth, …
Pyrrhotite in pyritic ores has often been attributed to the breakdown of pyrite during metamorphism. It is now clear that pyrrhotite can be primary and that the presence of pyrrhotite with the pyrite provides a buffer that constrains sulphur activity during metamorphism. Pyrite-pyrrhotite ratios change during metamorphism as prograde …
containing pyrrhotite as the primary sulphide, at a present throughput of 3,650t/d. The ore is crushed in two stages, using a 1m x 1.4m jaw crusher and 2.1m super heavy-duty cone crusher. The -1.9cm fine ore is ground in a conventional rod and ball mill circuit. Gold is recovered by gravity separation prior to cyanidation.