A distinguishing feature of the patented method is that the scientist proposed to use a composition instead of pure basalt rock, produced by mixing crushed basalt rocks with by-products of phosphate fertilizers production.
After melting at 1360-1380° C, “the mixture is incubated for 15-20 minutes until gas evolution has been stopped. After cooling, the set body is crushed to a particle size of 10 mm. The resulting mass is remelted at 1280- 1320° C with the addition of calcium orthophosphate; the mixing ratio of calcium orthophosphate to the above-mentioned mass is 1: 99.
Then, this material is incubated for 5-10 minutes until the homogeneous melt has been formed. This melt is extruded through the bushing with holes of 0.8-1 mm in diameter to form the fiber.
The fibers are blown by the flow of hot gas with a temperature of 1400- 1480 ° C to produce super-thin fiber of 0,3-0,97 mm. in diameter.”
Patent number IAP 05129, International Patent Classification codes 8 C 03 B 37/00, C 03 C 13/00.