Copaux-Kawecki process

Several breakdown processes have been used in which the ore is reacted with a fused or sintered fluorinating agent such as potassium hydrogen fluoride or sodium silicofluoride. The most important of these is the Copaux-Kawecki process for opening beryl ore. This is in many ways a unique process and other processes are unlikely to have many features in common with it apart from the problems associated with the handling of toxic fluorides. Since the fluorine is in combination with sodium, as the simple fluoride or as stable complexes with silicon and iron, the severe corrosion conditions inherent in many other fluorination reactions are almost absent in this case. 

Copaux-Kawecki An improved version of the Copaux process for extracting beryllium from beryl, which permits recovery of the fluorine. Addition of ferric sulfate to the dilute sodium fluoride solution remaining after the separation of the beryllium hydroxide precipitates sodium tetrafluoroferrate, which is then used in place of sodium fluorosilicate. 

---

See also in sourсe #XX -- [ ]

---