Abstract: The set of prefabricated construction elements comprises a first prismatic element having the form of a box-shaped body containing a bottom floor and a second prismatic element having the form of a box-shaped body with an inclined roof floor. Preferably the elements are made of precast reinforced concrete.One of the transverse walls of the first element is displaced to the interior, forming thus with the projecting lateral walls a wind shade. The interior of the walls is provided with insulation. According to the climate an external, insulating shell can be fastened to the external walls.Such a set of precast elements allows an economic fabrication with only two molds, an easy transport by trucks and a very easy and economic assembly on the spot on one hand and the erection of a multitude of different buildings to size on the other hand.

Abstract: Magnesium chloride can be recovered in high yield and in high purity from brines containing both magnesium chloride and alkali metal chlorides, by adding dioxane to the brine, separating the resultant precipitate from the brine and separating the dioxane contained in the precipitate from the latter.