Selective chlorination method for mixtures of metallic oxides of natural or synthetic origin
US4563338A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 25, 1983 |
| Grant date | Jan 7, 1986 |
| Priority date | — |
| Expiry date | May 25, 2003 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S423/12
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A selective chlorination method of a mixture of simple or complex metallic oxides, comprising at least one of the elements to be used, iron, aluminum, titanium and silicon, as well as the impurities accompanying said elements, said method consisting of a grinding, a calcination, a placing in suspension in a bath of melted salts of the mixture of said metallic oxides and of their impurities and of an introduction of chlorinating agents into said bath maintained at a temperature which assures the volatility of at least one of the metallic chlorides formed; characterized by the fact that, in order to selectively extract the metallic chlorides formed from the bath, specific chlorinating mixtures are introduced into this bath by successive steps, said mixtures having increasing chlorinating power, and the introduction is in a number at the most equal to the usuable elements to be chlorinated. This method is applied specifically to clays, bauxites, kaolins oil or bituminous shales, red sludges, oxide concentrates, anorthosite, feldspath and ilmenite.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.