TY JOUR TI Investigation of some physical and chemical properties of nepheline concentrate based silicon sorbents KW amorphous silicon dioxide KW nepheline KW sorption KW BET surface area KW porous structure JO Russian Journal of Biological Physics and Chemisrty AU Velyaev, Y.O. AU Maiorov, D.V. PY 2020 IS 5 PB Federal State Educational Institution of Higher Education Sevastopol State University