Method for producing refractories

Abstract

A method for producing refractories which comprises the steps: continuously feeding as a raw material a heavy oil having a boiling point higher than 150.degree. C. obtained by thermal cracking or steam cracking of petroleum hydrocarbons in a first state stirring vessel maintained at a pressure of higher than 2 Kg/cm.sup.2 G and a temperature within the range of from 300.degree. to 360.degree. C.; maintaining said raw material oil at an average residence time of longer than 15 minutes; continuously withdrawing a first stage treated oil from said first stage stirring vessel; supplying said first stage treated oil in a second stage stirring vessel maintained at a temperature within the range of from 370.degree. to 450.degree. C.; continuously withdrawing a second stage treated oil from said second stage stirring vessel while maintaining said first stage treated oil at an average residence time of from 30 minutes to 10 hours; continuously obtaining pitch by eliminating lighter components from said second stage treated oil; and producing unburned refractories and refractories, the former being obtained by mixing said pitch with basic refractory materials, followed by molding, and the latter being obtained by impregnating and filling said pitch in open porous portions of refractories.

Dependencies are inferred from the claim text.