The metamorphism of pyrite and pyritic ores: an overview
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 …
Cyanide Leaching and Decomposition of Pyrrhotite
Thus, pyrrhotite is not only a cyanicide but it also consumes oxygen in solution necessary for gold dissolution. Pyrrhotite, if kept dry, is stable but in the presence of water and air, it breaks down rapidly forming such compounds as sulphuric acid, ferrous sulphate, basic iron sulphates, ferrous carbonates and hydrates.
(PDF) A review of pyrrhotite flotation chemistry in the processing …
The non-stoichiometric sulfide mineral pyrrhotite (Fe1-xS) occurs almost ubiquitously inter-grown with the principal nickel mineral, pentlandite ((Fe,Ni)9S8). During Ni processing, pyrrhotite is generally rejected to the tailings stream by flotation to produce a low tonnage, high grade (Ni) smelter feed and reduce SO 2 emissions.
Flotation of chalcopyrite, pentlandite, pyrrhotite ores
A review is given of the processing of copper-nickel ores with particular emphasis placed on the rejection of the mineral pyrrhotite which is the principal source of sulfur in concentrates that are smelted. Methods of treatment that have evolved for processing ores from three different localities with slightly different mineralogical ...
Sudbury
BacTech is aggressively pursuing a new pyrrhotite bioleaching initiative for Nickel-Cobalt, Sulphur and Green Iron recovery in Ontario's Greater Sudbury Basin – an area believed to hold between 75 and 100 million tonnes of discarded pyrrhotite tailings containing US$15 billion worth of Nickel alone.
The Mineralogy and Crystallography of Pyrrhotite from …
For the platinum group element processing operations however, pyrrhotite recovery is targeted due to its association with the platinum group elements and minerals. Therefore, the ability to be able to manipulate pyrrhotite flotation performance is of importance. It can be best achieved if the mineralogical characteristics of the pyrrhotite ...
Chalcopyrite, Pentlandite, and Pyrrhotite | U.S. Geological …
Mineral: Chalcopyrite, Pentlandite, Pyrrhotite Mineral Origin: Creighton Mine, Sudbury, Ontario, Canada (Sample on loan from George J. Coakley) Primary Commodity: Copper and nickel Primary Commodity Uses: Copper is used primarily in electronics, mostly in building construction and industrial electronics.Nickel is mostly …
A REVIEW ON PROCESS-RELATED CHARACTERISTICS OF PYRRHOTITE
Consideration of the leaching processes of pyrrhotites focuses on the recovery of Ni and Au. The mechanisms of acid leaching are presented from physical, chemical, electrochemical, and crystallographic viewpoints. Other pyrrhotite processing techniques, including oxidation and flotation, are also included in this article.
Refining Approaches in the Platinum Group Metal Processing …
Mineable platinum group metal (PGM) deposits are rare and found in relatively few areas of the world. At the same time, the use of PGM is predicted to expand in green technology and energy applications, and PGMs are consequently currently listed as European Union critical metals. Increased mineralogical complexity, lower grade ores, …
Pyrrhotite Oxidation
Heating Pyrrhotite at 320 degrees C. will destroy its magnetism. Heating in the presence of Oxygen (no water) will have the following reaction equation (balanced) ; 3FeS + 5O2 = Fe3O4 + 3SO2 This is the process that used to be used at INCO in Sudbury, Ontario, Canada to convert FeS to Magnetite, which was then pelletized and sold as Iron Ore.
FLOTATION OF PYRRHOTITE FROM MAGNETITE ORES – A …
Upon successful determination of the appropriate conditions for pyrrhotite removal, a processing flowsheet was developed and validated by pilot scale testing. The results obtained in the latter ...
The mineralogy of pyrrhotite from Sudbury CCN and …
In order to manipulate its performance in nickel processing operations either to target the recovery or rejection or pyrrhotite, one needs an understanding of pyrrhotite mineralogy, reactivity and ...
USGS Publishes Map of Potential Pyrrhotite Occurrences
Pyrrhotite, a mineral of concern for the construction industry, consists of iron and sulfur, and when exposed to water and air, it can break down to form secondary minerals that expand and crack concrete, causing concrete structures, like home foundations, to fail. "This project was a bit unusual for us, because typically we're trying …
State Building Code: Pyrrhotite in Concrete Aggregate
DOT adopted standards for pyrrhotite in concrete aggregate used for its non-building projects (e.g., roads and bridges). The standard prohibits the use of aggregate that is more than 3% pyrrhotite, by ... crushing or otherwise processing of concrete structures or portions thereof. Prior to demolition or removal, concrete
Canadian pyrrhotite treatment: the history, inventory …
pyrrhotite processing; pyrrhotite rejection; pyrrhotite tailings inventory Introduction Canada's Sudbury mines have been a major source of nickel for over 120 years. Today, …
The mineralogy of pyrrhotite from Sudbury CCN and …
This implies that if the mineralogy of pyrrhotite is known, the performance of pyrrhotite in processing operations can be manipulated to exploit specific attributes of the different pyrrhotite types. This study has also shown the usefulness of process mineralogy as a field of research in aiding the understanding of pyrrhotite flotation performance.
Unveiling different pyrrhotite superstructures in copper-gold …
The challenges in managing pyrrhotite in processing plants stem from the lack of systematic mineralogical techniques to distinguish its superstructures in low …
A review of pyrrhotite flotation chemistry in the processing …
The chemistry of pyrrhotite flotation using xanthate collectors is reviewed with respect to the processing of PGM ores and the recent results from captive bubble contact angle measurements at the University of Utah are presented. In some cases a low flotation recovery of PGM may be due to the surface state of pyrrhotite particles under …
The problem with pyrrhotite
"The degree to which the process is affected by pyrrhotite includes not just the overall pyrrhotite content, but also the ratio of pyrrhotite to economic mineral(s) and the ratio of monoclinic to hexagonal pyrrhotite. ... "XPS has undertaken size-by-size mineralogical analysis of five different base metal concentrators processing both Ni ...
Canadian Pyrrhotite Tailings: The History, Inventory and Processing
Canadian nickel-copper ore deposits have been a major source of nickel, copper, cobalt and precious metals for more than 100 years. The two main minerals of interest, pentlandite (Pn, (Ni,Fe)9S8) and chalcopyrite (Cp, CuFeS2), are usually accompanied by large quantities of pyrrhotite (Po, Fe1-xS). Until the 1950s, Po …
(PDF) The flotation of magnetic and non-magnetic pyrrhotite …
During Ni processing, pyrrhotite is generally rejected to the tailings stream by flotation to produce a low tonnage, high grade (Ni) smelter feed and reduce SO 2 emissions. In this study, the effect of different pyrrhotite flotation rejection strategies (artificial oxidation and TETA: SMBS addition) are evaluated on a magnetic (Ore A) and non ...
Canadian pyrrhotite treatment: the history
DOI: 10.1080/00084433.2017.1361671 Corpus ID: 102597640; Canadian pyrrhotite treatment: the history, inventory and potential for tailings processing @article{Rezaei2017CanadianPT, title={Canadian pyrrhotite treatment: the history, inventory and potential for tailings processing}, author={Sabereh Rezaei and F. Liu and …
A review on pyrrhotite oxidation
1.. IntroductionAfter pyrite, pyrrhotite is the most common iron sulphide in nature. A better understanding of the reactivity and oxidation of pyrrhotite is needed for …
Removal of Pyrrhotite from High-Sulphur Tailings Utilising …
The non-oxidative pyrrhotite leaching produced an excess of H2S that would be required for the precipitation of metal sulphides in downstream processing. The non-oxidative pyrrhotite leaching also resulted in an FeSO4-dominated leachate …
Canadian pyrrhotite treatment: the history, inventory and …
This paper presents part of an extensive study on the Canadian pyrrhotite tailings with the aim of evaluating the resource and exploring a novel processing route. …
The Desulfurization of Magnetite Ore by Flotation with a …
The contamination of sulfur emanating from pyrrhotite in magnetite concentrates has been a problem in iron ore processing. This study utilized froth flotation to float pyrrhotite away from magnetite using collectors of xanthate and dixanthogen. It was found that xanthate or dixanthogen alone could not achieve selective separation between pyrrhotite and …
A review of the physicochemical properties and flotation of pyrrhotite …
Pyrrhotite is one of the most abundant sulphide gangue minerals in base metal mining operations. It has little economic value and is a significant contributor of SO 2 emissions at the smelting stage, thus it is rejected in most concentrators, requiring a concerted effort to ensure it is well separated from valuable minerals. The mineral processing of …
A review of pyrrhotite flotation chemistry in the …
A review of pyrrhotite flotation chemistry in the processing of PGM ores J.D. Miller a,*,J.Lia, J.C. Davidtz b, F. Vos b a Department of Metallurgical Engineering, University of Utah, Salt Lake ...
Canadian Pyrrhotite Tailings: The History, Inventory and …
Canadian nickel-copper ore deposits have been a major source of nickel, copper, cobalt and precious metals for more than 100 years. The two main minerals of …
A review of pyrrhotite flotation chemistry in the processing …
The chemistry of pyrrhotite flotation using xanthate collectors is reviewed with respect to the processing of PGM ores and the recent results from captive bubble contact angle measurements at the University of Utah are presented. In some cases a low flotation recovery of PGM may be due to the surface state of pyrrhotite particles under ...