On the Role of Metamorphism in the Formation of Nickel-Copper Sulfide Deposits in the Kola Peninsula

1986 ◽  
pp. 135-150
Author(s):  
Yu. N. Yakovlev ◽  
A. K. Yakovleva
Keyword(s):  
Kola Peninsula ◽  
Copper Sulfide ◽  
Sulfide Deposits ◽  
Nickel Copper

scholarly journals The Critical Role of Pulp Density on Flotation Separation of Nickel-Copper Sulfide from Fine Serpentine

Minerals ◽  
2018 ◽  
Vol 8 (8) ◽  
pp. 317 ◽  
Author(s):  
Yawen Gao ◽  
Guofan Zhang ◽  
Mengtao Wang ◽  
Dezhi Liu
Keyword(s):  
Copper Sulfide ◽  
Critical Role ◽  
Flow Property ◽  
Pulp Density ◽  
Copper Recovery ◽  
Solid Ratio ◽  
Nickel Copper ◽  
Study Test ◽  
Serpentine Mineral

A nickel-copper sulfide system usually coexists with serpentine in deposits. Low nickel-copper recovery and high content of serpentine in concentration adversely affects subsequent metallurgical processes. In this study, test data showed different rheological results at various densities. When the solid ratio of sulfide to serpentine was 1:1, lower pulp density (20 wt %) contributed to better rheological and flotation outcomes. Generally, the addition of SHMP (sodium hexametaphosphate) is beneficial to reduce the amount of serpentine mineral into the concentration as a depressant through changing the surface electrical behavior of serpentine. However, the different dosages of SHMP have little impact on pulp rheology at 40 wt % of slurry, but there is a huge difference on flow property at 20 wt % pulp. The results revealed that rheology, which is caused by pulp density, played a key role in flotation performance. The decline in density (from 40 wt % to 20 wt %) increased the nickel and copper recoveries from 70.7% to 79.5% and 82% to 85.4% respectively in the artificial mixture (1:1). The content of serpentine in concentration decreased by around 20% by using SHMP at the same time.

Significance of compositional zoning in cumulate chromites of the Kabanga chonoliths, Tanzania

2018 ◽  
Vol 82 (3) ◽  
pp. 675-696 ◽  
Author(s):  
David M. Evans
Keyword(s):  
Divalent Cations ◽  
Chrome Spinel ◽  
Compositional Zoning ◽  
Sulfide Deposits ◽  
Nickel Copper ◽  
History Of ◽  
Trivalent Cations ◽  
Indicator Mineral ◽  
Normal Zoning ◽  
North Western

ABSTRACTCompositional zoning is observed rarely in chrome-spinel grains from slowly-cooled layered intrusions because diffusion of cations continues within the spinel to low temperatures. However, in certain circumstances, such gradational zoning of both divalent and trivalent cations is observed and may be useful in deciphering the thermal history of the host intrusions. The accessory chrome-spinels of the Kabanga mafic-ultramafic chonolith intrusions of the Kibaran igneous event in north western Tanzania are notable because they have preserved gradational compositional zoning. This zoning is demonstrated to predate and be independent of later hydrous alteration of the silicate assemblage. At Kabanga, most chrome-spinel grains within olivine-rich cumulate rocks are gradationally and cryptically zoned from Fe2+-Cr3+ rich cores to more Mg2+-Al3+ rich rims (normal zoning). A few grains are zoned from Mg2+-Al3+ rich cores to more Fe2+-Cr3+ rich rims (reverse zoned). The zoning of divalent cations is proportional to that of trivalent cations with Mg2+ following Al3+ and Fe2+ following Cr3+ from core to rim. The zoning of trivalent and tetravalent cations is interpreted to be caused by either new growth from an evolving melt or peritectic reactions between evolved or contaminated melt and adjacent Al-Cr-bearing ferromagnesian minerals, which is preserved by relatively rapid initial cooling in the small chonolith intrusions. Divalent cation zoning is controlled by sub-solidus exchange of Fe2+ and Mg with adjacent ferromagnesian minerals and continues to lower temperatures, indicated to be 580 to 630°C by the spinel-olivine geothermometer. Preservation of such zoning is more likely in the smaller chonolith intrusions that typically host magmatic nickel-copper sulfide deposits and can be used as an exploration indicator when interpreting chromite compositions in regional heavy indicator mineral surveys.

Preparation of nanoporous nickel copper sulfide on carbon cloth for high-performance hybrid supercapacitors

2018 ◽  
Vol 273 ◽  
pp. 170-180 ◽  
Author(s):  
Dongwei Du ◽  
Rong Lan ◽  
John Humphreys ◽  
Houari Amari ◽  
Shanwen Tao
Keyword(s):  
Copper Sulfide ◽  
High Performance ◽  
Carbon Cloth ◽  
Hybrid Supercapacitors ◽  
Nickel Copper

Tin–polymetallic sulfide deposits in the eastern part of the Dachang tin field (South China) and the role of black shales in their origin

2002 ◽  
Vol 38 (1) ◽  
pp. 39-66 ◽  
Author(s):  
Jan Pašava ◽  
Bohdan Kříbek ◽  
Petr Dobeš ◽  
Ivan Vavřín ◽  
Karel Žák ◽  
...  
Keyword(s):  
South China ◽  
Black Shales ◽  
Sulfide Deposits
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