Process for producing refractory particles
US8025824B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 7, 2010 |
| Grant date | Sep 27, 2011 |
| Priority date | — |
| Expiry date | Jun 7, 2030 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P40/60
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
To provide a process for producing high-purity highly oxidized refractory particles easily with good productivity by treating a spent refractory containing ZrO2 and Al2O3 to reduce components other than ZrO2 and Al2O3 to levels unproblematic for practical use as raw material for electrofused refractories and to increase the content of the ZrO2 and/or Al2O3 component.A process for producing refractory particles, which comprises introducing to and melting in a melting furnace both a spent refractory which contains, by mass % as chemical components, from 75 to 97% of ZrO2 and/or Al2O3, from 2 to 25% of SiO2, from 0.4 to 7% in total of Na2O, K2O and Li2O(Na2O+K2O+Li2O), at most 2% of CaO and at most 2% of MgO, and carbon particles in an amount of from 1 to 8% by outer mass percentage based on the spent refractory, and after the melting, tapping the melt while blowing compressed air against the melt to form refractory particles having the content of ZrO2 and/or Al2O3 increased.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.