초록 ▼

A process for defluorinating a solution of a sulphate of Zn, Ni, Cd, Mn and/or Mg, in which Al3+and PO43-ions are added to the solution, then the solution is neutralized up to a pH higher than 4 and lower than that one that causes a substantial precipitation of Zn, Ni, Cd, Mn and/or Mg, thereby prod

A process for defluorinating a solution of a sulphate of Zn, Ni, Cd, Mn and/or Mg, in which Al3+and PO43-ions are added to the solution, then the solution is neutralized up to a pH higher than 4 and lower than that one that causes a substantial precipitation of Zn, Ni, Cd, Mn and/or Mg, thereby producing a fluorinated precipitate, and the precipitate is separated from the solution.

대표청구항 ▼

A process for separating F-ions from an acid aqueous solution of ZnSO4, comprising the steps of (a) adding Al3+and PO43-ions to the solution so that the solution contains at least about 1 g/l of Al3+and at least about 3.5 g/l of PO43-; (b) neutralizing the solution up to a pH higher than 4 and lower

A process for separating F-ions from an acid aqueous solution of ZnSO4, comprising the steps of (a) adding Al3+and PO43-ions to the solution so that the solution contains at least about 1 g/l of Al3+and at least about 3.5 g/l of PO43-; (b) neutralizing the solution up to a pH higher than 4 and lower than about 5 and a temperature of between about 45°and 90°C., thereby forming a fluorinated precipitate and by separating (c) filtering said fluorinated precipitate from the solution, thereby producing a partially defluorinated solution.