KKQ Perlite Expansion & Vitrification Furnace is invented by our factory director and senior engineer Kong Keqiang in 2003, in the same year, He obtained patent for this kind of furnace ,they are used to produce closed perlite vitrified microspheres and hollow perlite vitrified microspheres .We use 6 microcomputers to full automatically control technology processes of closed perlite vitrified microspheres such as sand softening, crystal water vapourization instantaneously, size of hollow balling ,shell vitrified for water-proof and shell hardening. At present, many countries in the world such as America, Canada, Australasia, Poland, Thailand, Russia and South Korea have gradually adopted our furnaces to produce perlite vitrified microspheres.