Process and device for recovering and treating of aqueous solutions containing metal salts

A method for treatment and processing of a solution of an organic fluid, water and one or more compounds of an alkaline earth metals, alkali metals and metal ions comprises: a) conducting a stream 5 consisting of organic fluid, water and one or more compounds of an alkaline earth metals, alkali metals and metal ions to a salt removing and crystallization unit (6) optionally over a diaphragm filtration unit (16); b) nucleating crystals of the compounds of the one or more compounds of an alkaline earth metals, alkali metals and/or metal ions by means of depressurization and temperature increase; c) evaporating and optionally partially condensing the stream (5) and providing thereby a stream (9,10) of water and organic fluid in vapour phase and a stream of (8 of figure 1, 20 and 23 in figure 3) of organic fluid in liquid phase and the compounds of one or more compounds of an alkaline earth metals, alkali metals and/or metal ions; d) conducting the stream of (8,20, 23) consisting of organic fluid and the compounds of one or more compounds of an alkaline earth metals, alkali metals and/or metal ions to a salt reduction means (24) and e) removing the portion of the precipitated crystals and/or particles of the compounds of one or more compounds of an alkaline earth metals, alkali metals and/or metal ions.