Solubility Products of Metal Sulfides in Molten Salts: Measurements and Calculations for Iron Sulfide in the Eutectic Composition

1978 ◽  
Vol 125 (10) ◽  
pp. 1567-1573 ◽  
Author(s):  
Marie‐Louise Saboungi ◽  
Jane J. Marr ◽  
Milton Blander
Keyword(s):  
Molten Salts ◽  
Eutectic Composition ◽  
Iron Sulfide ◽  
Metal Sulfides ◽  
Solubility Products

The nature of green alkaline iron sulfide solutions and the preparation of sodium iron(III) sulfide, NaFeS2

1978 ◽  
Vol 56 (22) ◽  
pp. 2797-2802 ◽  
Author(s):  
Peter Taylor ◽  
David W. Shoesmith
Keyword(s):  
Alkali Metal ◽  
Kinetic Data ◽  
Iron Sulfide ◽  
Paper Industry ◽  
Pulp And Paper Industry ◽  
Pulp And Paper ◽  
Metal Sulfides ◽  
X Ray ◽  
Green Liquor ◽  
Iron Salts

The intense emerald green solutions formed by the reaction of iron salts with alkali metal sulfides at pH 11–13 have been found to contain colloidal MFeS2, M = Li, Na, K. Solid KFeS2 and NaFeS2 have been recovered from these systems. X-ray powder diffraction studies confirmed the identity of KFeS2, and showed NaFeS2 to have a structure different from those of other MFeS2 compounds, and related to that of the mineral rasvumite, K3Fe9S14. Some aspects of the crystal structures and chemistry of different MFeS2 compounds are discussed. A mechanism for the formation of colloidal MFeS2 is proposed on the basis of kinetic data. It is likely that colloidal NaFeS2 is responsible for the colour of the "green liquor" of the pulp and paper industry.

Scanning Electron Microscope Study of Bacteria on Mineral Surfaces

1976 ◽  
Vol 34 ◽  
pp. 130-131
Author(s):  
V.K. Berry
Keyword(s):  
Oxidation Reaction ◽  
Electron Microscope Study ◽  
Elemental Sulfur ◽  
Thiobacillus Ferrooxidans ◽  
Physical Contact ◽  
Metal Sulfides ◽  
Low Grade ◽  
Mineral Surfaces ◽  
Mineral Surface ◽  
Scanning Electron Microscope Study

There are two strains of bacteria viz. Thiobacillus thiooxidansand Thiobacillus ferrooxidanswidely mentioned to play an important role in the leaching process of low-grade ores. Another strain used in this study is a thermophile and is designated Caldariella .These microorganisms are acidophilic chemosynthetic aerobic autotrophs and are capable of oxidizing many metal sulfides and elemental sulfur to sulfates and Fe2+ to Fe3+. The necessity of physical contact or attachment by bacteria to mineral surfaces during oxidation reaction has not been fairly established so far. Temple and Koehler reported that during oxidation of marcasite T. thiooxidanswere found concentrated on mineral surface. Schaeffer, et al. demonstrated that physical contact or attachment is essential for oxidation of sulfur.

Point and planar defects in the iron sulfide compounds Fe1-xS

1984 ◽  
Vol 42 ◽  
pp. 434-435
Author(s):  
Thao A. Nguyen
Keyword(s):  
Low Temperatures ◽  
Direct Evidence ◽  
Iron Sulfide ◽  
Planar Defects ◽  
Selective Area ◽  
Vacancy Ordering ◽  
Different Types ◽  
Lattice Images ◽  
The Subject ◽  
Beam Lattice

It is well known that the large deviations from stoichiometry in iron sulfide compounds, Fe1-xS (0≤x≤0.125), are accommodated by iron vacancies which order and form superstructures at low temperatures. Although the ordering of the iron vacancies has been well established, the modes of vacancy ordering, hence superstructures, as a function of composition and temperature are still the subject of much controversy. This investigation gives direct evidence from many-beam lattice images of Fe1-xS that the 4C superstructure transforms into the 3C superstructure (Fig. 1) rather than the MC phase as previously suggested. Also observed are an intrinsic stacking fault in the sulfur sublattice and two different types of vacancy-ordering antiphase boundaries. Evidence from selective area optical diffractograms suggests that these planar defects complicate the diffraction pattern greatly.

Chemical physics of molten salts with organic anions,

1969 ◽  
Vol 66 ◽  
pp. 59-63 ◽  
Author(s):  
A. R. Ubbelohde ◽  
F. R. S.
Keyword(s):  
Molten Salts ◽  
Organic Anions ◽  
Chemical Physics
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