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 …
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 (i.e., Fe 7 S 8). ... Samples were crushed in a jaw crusher and further ground in a ceramic ball mill. A CSC Scientific Sieve shaker was used to sieve all samples by shaking 150 ...
Accompanying the Pyrrhotite are many hexagonal prismatic quartz crystals that form a thin crust. These crystals do not exceed 0.7" (1.8 cm) in length and are generally in very good condition, though a few are noticeably damaged. Resting on the quartz and adjacent to the Pyrrhotite are 4 galena and several chalcopyrite crystals.
Use jaw crusher and cone crusher to crush the raw pyrrhotite ore, and use a vibrating screen to reduce the material particle size to less than 20 mm. Grinding: The …
An overview of chalcophile element contents of pyrrhotite, pentlandite, chalcopyrite, and pyrite from magmatic Ni-Cu-PGE sulfide deposits Eduardo T. Mansur1 & Sarah-Jane Barnes1 & Charley J. Duran1,2 Received: 14 April 2020 /Accepted: 31 August 2020 # Springer-Verlag Germany, part of Springer Nature 2020 Abstract
The original primary crusher building still stands on the hill behind our COSA. Though it is not used in our process today, it remains a repository for historical core samples from both Humboldt and Ropes mines. ... it was obvious that the pyrrhotite contained in our ore was a concern. When pyrrhotite, an iron sulfide mineral, is …
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, …
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…
In this work, we have compiled the trace element concentrations in pyrrhotite (Po), pentlandite (Pn), chalcopyrite (Ccp), and pyrite (Py) obtained by laser ablation …
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 ...
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).
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 …
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 …
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 …
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 ...
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.
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.
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, …
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 …
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 (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.
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 …
Liberation for both pyrrhotite and pyrite improves considerably as the particle size decreases, with 92 percent of the pyrrhotite in the size fraction 0.3-0.106 mm occurring in the form of fully ...
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 …
Based on the JK Drop Weight test and principle of selective crushing, a multicomponent complex ore with its component minerals, i.e., pyrrhotite, sphalerite, and …
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.
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.
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 …
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 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.
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 …
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 …
The oxidation of sulfide minerals is of central importance due to the acid mine drainage (AMD) production. The bio-oxidation of pyrrhotite, pyrite, marcasite, and arsenopyrite was carried out with mesophilic bacteria (Acidithiobacillus ferrooxidans, A. thiooxidans, and Leptospirillum ferrooxidans) at 34 °C for 30 days.Bio-oxidation tests …