Assertion: cryolite's amount | /r/HasProperty | returned to the part of the alumina column
Facets:
Source sentences:
text: In a process of recovering cryolite from waste gases leaving the electrolytic cell of the aluminum manufacture and containing fluorine substantially in the form of acid sodium fluoride, the steps which comprise passing said waste gases leaving the electrolytic cell through a column of cold, substantially unreactive, anhydrous alumina obtained by calcining hydrated alumina at a temperature between about 1200 C. and about 1400 C., continually returning the part of the alumina column adjacent to the electrolytic cell and having adsorbed thereto acid sodium fluoride into the molten electrolytic bath, thereby converting the adsorbed acid sodium fluoride into cryolite, and continually supplying anhydrous alumina equivalent to the amount of alumina returned to the cell to the part of the alumina column removed from the cell.