Method for producing calcium chloride scales
AssigneeCT Umwelttechnik AG
InventorFriedrich Hoyer
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Abstract
In the method, calcium chloride scales (75) are produced on a cooled surface (20), namely through the application of a layer (70) consisting of an aqueous CaCl.sub.2 solution (7) to the cooled surface, solidification of the layer and stripping off the solidified layer. The solution contains less than 70% CaCl.sub.2 by weight, preferably less than 65% CaCl.sub.2 by weight. The layer thickness is set to a maximum of about 1 mm. A relative speed between the point of application of the solution and the cooling surface is produced so that a specific production rate of at least 20 g/s m.sup.2 is connected with this relative speed. The heat is carried off so rapidly through the cooling surface that the solidified layer remains largely free from calcium chloride dihydrate, CaCl.sub.2.2H.sub.2 O. Dry scales thus arise.
Claims10
A method for producing calcium chloride scales on a cooled surface, the method comprising the steps of:
- applying a layer of an aqueous CaCl.sub.2 solution to a cooled surface, the solution containing less than 70% CaCl.sub.2 by weight;
- producing a relative motion between the location of applying the layer of the aqueous CaCl.sub.2 solution and the cooled surface, and maintaining the layer of the aqueous CaCl.sub.2 solution at a maximum thickness of about 1 mm;
- cooling the surface to solidify the applied layer of the aqueous CaCl.sub.2 solution at such a rapid rate that the solidified layer is substantially free from calcium chloride dihydrate (CaCl.sub.2 -2H.sub.2 O);
- and
- forming dry scales from the solidified layer, wherein the dry scales comprise CaCl.sub.2 -4H.sub.2 O and optionally CaCl.sub.2 -6H.sub.2 O.
Dependencies are inferred from the claim text.