A method for promoting rapid crystallization of stannous chloride

Abstract

The application discloses a method for promoting rapid crystallization of stannous chloride, which comprises the following steps: adding anhydrous stannous chloride crystal seeds into a stannous chloride concentrated solution, stirring and cooling, and obtaining stannous chloride crystals; the anhydrous stannous chloride crystal seeds are prepared by adding 30-50% ethyl acetate into dihydrous stannous chloride according to the mass of stannous chloride, then vacuum heating and concentrating, wherein the vacuum degree is greater than or equal to -0.08 MPa, the heating temperature is 80-90 DEG C, the Baume degree of the concentrated end point is 88-92 Be, and finally cooling to 20-40 DEG C. The anhydrous stannous chloride crystal seeds are modified by adding ethyl acetate, thereby having the characteristics of not easy to agglomerate and no crystallization water, so that in the crystallization process of the stannous chloride concentrated solution, the molecular bond directly acts on chloride ions and tin ions, the action on hydroxyl ions is reduced, the crystallization rate is increased from the existing 1.3-1.5 kg / h*l to 1.8-2.0 kg / h*l, and the crystallization rate is greatly improved.

Images