The subject of the invention is a process for manufacturing compounds based on
one or more silicates of alkali metals, such as Na and K and/or alkaline earth
metals such as Ca, Mg, and/or on rare earths, such as Ce, optionally in the form
of mixed silicates which combine alkaline-earth metals, such as Ca, with the alkali
metal(s) and the rare earth(s), by conversion of silica and of halides, especially
of one or more chlorides, or sulfate or nitrate, of the said alkali metals and/or
of the said rare earths and/or of the said alkaline-earth metals, such as NaCl,
KCl or CeCl4. The heat needed for the conversion is supplied, at least
partly, by one or more submerged burners.
The subject of the invention is also an apparatus for carrying out the process
and for its use.
