Method for making antimony trioxide powder
US4347060A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 22, 1981 |
| Grant date | Aug 31, 1982 |
| Priority date | — |
| Expiry date | Apr 22, 2001 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2004/64
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A method and apparatus for making an antimony trioxide powder having a specific particle size distribution from crude antimony trioxide which contains a small amount of impurities having a higher vaporization temperature by passing the crude antimony trioxide through a plasma arc tail gas reaction zone, vaporizing in a chamber communicating with the reaction zone the antimony trioxide at a temperature that liquifies the impurities, exiting the gases from the chamber through one port, draining the liquified impurities from the chamber through the port, contacting the exiting materials with a quench gas, mechanically clearing the exit port of solidified impurities and separating the antimony trioxide powder from the other exiting materials.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.