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...

Bastnaesite, a rare-earth fluocarbonate, was found in the Mountain Pass district in April 1949. Subsequent geologic mapping has shown that rare-earth mineral deposits occur in a belt about 6 miles long and iy2 miles wide. One of the deposits, the Sulphide Queen carbonate body, is the greatest concentration of rare-earth minerals now known in the world. The Mountain Pass district is in a block o...

ABSTRACT In the Brazilian Savanna, most of soils have a low natural fertility. order to overcome this limitation, farmers use large amounts soluble fertilizers, causing environmental impacts. present study, finely ground biotite syenite (0; 600; 1,200; 1,800; and 2,400 kg ha-1) was evaluated as an alternative source nutrients electrical charges in weathered Ferralsol from Savanna. Additionally,...

Khezr-Abad pluton is cropped out in North-West of Taft. This granitoid seems to be younger than the surrounding metamorphosed rocks, particularly the lower cretaceous limestones and probably is implaced during Oligo-Miocene. The most volumetric abundances of the igneous rocks are: granodiorite, granite, quartzmonzo-diorite, quartz-diorite, and in a lesser amount tonalite, quartz-syenite and ...

Paleozoic gneissic granitoids are an important lithologic component of the Shoo Fly Complex of the central Sierra Nevada, California. Field relations, petrographic, and geochemical studies indicate that the gneisses were originally intruded as a seri.es of plutons ranging from gabbro (oldest) to granite and granodiorite (median age) to syenite (youngest) with the granitoid types predominating. ...