Pyrrhotite - Wikipedia
Pyrrhotite is an iron sulfide mineral with the formula Fe 1-x S x = 0 to 0.2 . ... Their structure is based on the NiAs unit cell. ... The exception is for those with high iron content close to the troilite composition ... The ferromagnetism which is widely observed in pyrrhotite is therefore attributed to the presence of relatively large ...
Massive Sulfide - an overview ScienceDirect Topics
As transport distance down-ice increases glacial crushing of grains liberates the ... Since pyrrhotite is a magnetic mineral Table 3 there can be a magnetic anomaly ... The sulfide minerals in the massive section of VMS deposits have higher ... during accretion of protocontinents and the development of major mobile belts.
Pyrrhotite - an overview ScienceDirect Topics
The gangue rock is hydrophilic as is pyrrhotite at high pH values. ... crushing and grinding the ores to liberate the nickel- and cobalt-bearing ... They give a froth that i is strong enough in the flotation cell to support the floated pentlandite particles; ... Pentlandite NiFe 9S8 ore is the largest source of nickel as sulfide in the ...
Leaching of Pyrrhotite from Nickel Concentrate - DiVA
38.8% to 57.8% H2SO4 and temperatures from 60 to 100 C. The best results were obtained in experiments ... The utilized leaching process generates by-products in the form of large quantities of Fe2 in ... Comminution. The breaking crushing or grinding of an ore to obtain a ... with vacuum suction at one end. Figure 11 ...
Magnetic properties of natural pyrrhotite Part I - Utrecht ...
Typical for pyrrhotite are a large Hc/Hcr ratio and a .Jrs/Xin ratio ... resolution electron microscopy e.g. Morimoto et ... Cell dimensions are in A; cell volumes in cubic A. The indi ed errors arestandard deviations. 4C. ... Crushing was performed in a Cu mortar. ... higher X 0of the EGI fractions is caused by their magnetite.
Major and Trace Element Geochemistry of Pyrite and ... - MDPI
1 Sep 2018 ... The higher Au/Ag and Fe/ S As ratios of pyrite and crystallization temperatures 286–387 ◦C of hexagonal pyrrhotite indi e that the ...
BIG MONEY RARE PYRRHOTITE CRYSTALS FOUND ...
11 Sep 2017 ... Don't make the same mistake as me These fuggly pyrrhotite crystals are rare and valuable to a collector.
Impact of sulphide minerals pyrrhotite - Nordic Concrete ...
11 Jan 2019 ... Stone from Norwegian tunnelling-project containing sulphide ... sulphide minerals pyrrhotite in concrete aggregate on concrete ... combination with relatively high contents of sulphur it was decided to ... The segments are produced in a large factory area ... storage of the aggregates improve the quality? 2 ...
Banded iron formations pyritic black shale and gold ... - CORE
When I was nearing the end of my Master's degree and had plans for doing a ... particular sulfides associated with the BIF-gold ores e.g. pyrite pyrrhotite and ... The sulfides within ore zones at both deposits do not contain the same high ... sequence the fluid becomes sufficiently mobile to scavenge large quantities of ...
Report - SINTEF
7 Aug 2019 ... 8.3 Aggregate quality achieved with portable crushing plants . ... Asphalt aggregate production high quality and/or difficult material ... Aggregates are major constituents in construction the global request for ... Follobanen project where out-of-standards content of pyrrhotite was detected in the rock materials.
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