Patent ID: 8580105

Claim:
Process for the development of an ecological binder system for a refractory mix, comprising the steps of: a) distilling coal-tar with a concentration of benzo(a)pyrene of the order of 12,000 ppm at a temperature of about 180° C. to obtain a tar with a high content of benzo(a)pyrene; b) subjecting the tar obtained in step a) to fractional distillation at a temperature of 470° C.+/−20° C. to achieve a modified pitch with a concentration of benzo(a)pyrene of 600 ppm or less at a pressure of 0.01 to 1.5 bars; and c) adding anthracene oil in the range of 40% to 70%, to obtain a material with a viscosity of 220-1,000 cps at 60° C., volumetric density of 1 to 1.3 and a benzo(a)pyrene concentration of less than 500 ppm.