C - Chemistry – Metallurgy – 01 – B
Patent
C - Chemistry, Metallurgy
01
B
23/67
C01B 25/30 (2006.01) C01B 25/45 (2006.01) C05B 9/00 (2006.01)
Patent
CA 1126476
ABSTRACT OF THE DISCLOSURE Potassium magnesium phosphate can be produced without the application of special and technologically expensive measures and without the use of supplementary substances, while proceeding from easily available starting materials. Potassium magnesium phosphate is prepared by reacting acidic aqueous solutions containing phosphate ions with potassium chloride and with alkaline magnesium compounds. According to the method, an alkaline magnesium compound in the amount stoichiometrically required to yield dimagnesium phosphate and part of the required total amount of potassium chloride was introduced under stirring into an acidic phosphate solution, having a P205 content of 20 to 167 g of P205 per 1000 g of water and, following addition of the residual amount of potassium chloride, whereby the total amount of potassium chloride added is increased to a molar ratio of K20 :P205 of more than 1 : 1, which is slightly below the saturation concentration. The alkaline magnesium compound is slowly introduced into the resulting suspension, at a temperature below 40°C, in the amount stoichiometrically required to form tertiary magnesium phosphate, whereby a concentration of 130 g of MgC12 in 1000 g of water in the reaction mixture is not exceeded. Then the product is separated from the mother liquor, washed with water and dried. The method according to the present invention flows from the discovery that potassium magnesium phospate it metastable in the presence of soluble salts of magnesium, particuarly of magnesium chloride, and that it forms trimagnesium phosphate in such solutions according to the formula 2KMgP04 + MgC12 = Mg3 (P04)2 + 2 KC1
332070
Gowling Lafleur Henderson Llp
Kali Und Salz Ag
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