The increasing demand for aluminum in conjunction with the limited available bauxite deposits Europe results dire need evaluation of alternative raw materials whole value chain alumina production. present paper focuses on possible use nepheline syenite, originated as a mine byproduct, production through leaching an azeotropic HCl solution. Previous work syenite dissolution focused more extracti...

The Mont Shefford alkaline complex of southern Quebec contains mafic rocks and both silica-oversatwated and -undersaturated syenites. Chemical and isotopic studies examine the relationship of the various lithologies. Isotopic, major, and trace-element compositions are consistent with derivation of all Iithologies from a common mafic paren! some of which evolved to a syenitic itage by fractional...

Some silicate rocks are a rich source of potassium (K), with the possibility for use in agriculture. The present study aimed to evaluate agronomic efficiency index (AEI) nepheline syenite (NS) and phonolite (PN) comparison chloride (KCl) as K maize production. An experiment was conducted greenhouse Ilha Solteira, São Paulo, Brazil. A hybrid grown 8 L pots filled 6 kg soil low concentration cont...

The effects of particulate matter (PM) from diesel and leaded gasoline motor vehicles exhaust emissions on sulfation of granites, syenite and gabbro stones have been experimentally studied. Abundant gypsum crystals and corrosion features developed on stones covered with diesel PM (DPM) following 72 h exposure to 100 ppm SO2 at a relative humidity of 100%. In contrast, very small amounts of gyps...

We studied partially altered veined nepheline syenites at the Chernihivka carbonatite massif of Azov region, Ukraine. The major minerals syenite are albite, nepheline, biotite and calcite. Fluorapatite, allanite-(Ce), monazite-(Ce), barite stronalsite occur as minor accessory phases. primary minerals, containing REE in rocks, reflect re-equilibration a mineral/fluid systems recrystallization ro...