Sökning: "Mineral Chemistry"
Visar resultat 36 - 40 av 166 avhandlingar innehållade orden Mineral Chemistry.
36. Surface reactions of magnetite and maghemite with dissolved and added ions in process water
Sammanfattning : Reactions between mineral surfaces and dissolved species in process water, both inorganic and organic play an important role in mineral processing. Reverse flotation of finely comminuted iron ore is sometimes employed in order to remove the phosphorous mineral apatite. LÄS MER
37. Orientation of collectors adsorbed at the ZnS/solution interface
Sammanfattning : The separation and concentration of minerals by flotation is a well-known industrial process. In this process collectors are used to increase the hydrophobicity of the surfaces of the minerals. LÄS MER
38. 31 P- and 65 Cu- solid state NMR studies of Cu(I) di-alkyl-dithiophosphates : complex Formation Mechanism on Synthetic Chalcocite Surfaces
Sammanfattning : Alkyl substituted derivatives of dithiophosphoric acid are frequently used as collectors in froth flotation enrichment of copper sulfide ores. Due to interaction between Cu atoms at the surface and thiol collector molecules, a concomitant adsorption process occurs on the mineral surface. LÄS MER
39. Surface reactions in aqueous suspensions of fluorapatite and iron oxides
Sammanfattning : The main objectives have been to study and model surface reactions of aqueous suspen-sions of minerals with relevance to the dephosphorization of iron oxides by reverse froth flotation. Synthetic hematite, maghemite and fluorapatite in colloidal forms were prepared and thoroughly characterized using XRD, SEM, BET, FT-IR and FT-Raman. LÄS MER
40. Novel boron compounds in lubrication
Sammanfattning : Lubricants are used to control friction and reduce wear by preventing direct contact between surfaces in a relative motion. Most of the modern lubricants and lubricant additives have been designed and optimized for ferrous materials. LÄS MER
