Prof. Nikolay Popov has consistently worked at the Research Institutes "NIPRORUDA", Mineralkomplekt, Mineralagro-Sofia, Bulgaria as an associate, head of section and director. He professionally deals with the raw materials - kaolin, bentonite, quartz sands, diatomaceous earth, non-resistant clays and gypsum. He worked as an associate of the Minister of Mineral Resources and Metallurgy. Prof. Popov is an author of over 40 scientific publications . He participated in several national and international research projects and international congresses on natural zeolites in Italy, USA, Hungary, Georgia, Sofia and Poland. He is the author of 7 patents, including such in USA, Japan, Italy, France.