PYROCRYSTAL S.r.l. projects, manufactures and installs on a turnkey basis
softening plants on one or more lines with time and/or volume regeneration.
Softening is a process of partial removal of solids solved into e solution, to
reduce its hardness.
This process could be considered a particular kind of demineralization (for more
information see the related page).
Having stated that most part of incrustations of surfaces in contact with water
containing salts are due to bivalent metallic ions salts, and in particular
Calcium and Magnesium, it is possible, in some cases to limit the process of
demineralization to the removal of those ions, employing ionic exchange resins.
In this case are used cationic resins to obtain the following reaction:
- CaSO4 + Rm ------> RmSO4 + Ca++
If, for example, the metallic Ion Rm is constituted by Sodium Na, we'll obtain
Sodium Sulfate, soluble, instead of Calcium Sulfate, almost insoluble.
Regeneration is carried out, instead of using strong acid, using a sodic
salt of strong acid, generally NaCl (Sodium Chloride), in saturate solution, and
the eluate will be constituted of CaCl2, relatively inert.
Softening, differently from demineralization, doesn't remove solids solved into
water, but modify them chemically.