Method for producing refractories
US4229221A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Jan 15, 1979 |
| Grant date | Oct 21, 1980 |
| Priority date | — |
| Expiry date | Jan 15, 1999 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10C3/002
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
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 la…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.