Sulfur-containing fertilizer and process for production thereof

Details Sulfur-containing fertilizer and process for production thereof Sulfur-containing fertilizer and process for production thereof

C - Chemistry, Metallurgy

05

C

C05C 3/00 (2006.01) C05B 1/00 (2006.01) C05B 7/00 (2006.01) C05G 1/06 (2006.01) C05G 3/00 (2006.01)

Patent

CA 2214145

A particulate sulfur-containing fertilizer comprising a uniform dispersion of sulfur and at least one member selected from the group consisting of ammonium sulfate, ammonium phosphate and mixtures thereof, the sulfur having an average particle size of less than about 100 µm. A process for producing the granulated sulfur-containing fertilizer is described. The process comprises the steps of: (i) providing a first stream comprising ammonia; (ii) providing a second stream comprising at least one member selected from the group consisting of sulfuric acid, phosphoric acid and mixtures thereof; (iii) providing a third stream comprising an aqueous liquid; (iv) mixing the first stream, the second stream and the third stream to form a liquid reaction mixture; (v) feeding the liquid reaction mixture to a mixer; (vi) feeding a fourth stream comprising molten sulfur to the mixer prior to solidification of the reaction mixture; and (vii) solidifying the homogenized melt to produce the granulated sulfur-containing fertilizer.

Engrais particulaire contenant du soufre, et comprenant une dispersion uniforme de soufre et d'au moins un élément choisi dans le groupe composé de sulfate d'ammonium, de phosphate d'ammonium et de mélanges de ceux-ci, le soufre présentant une granulométrie moyenne inférieure à environ 100 µm. Un procédé de production de l'engrais granulé contenant du soufre est décrit. Ce procédé consiste à (i) produire un premier courant contenant de l'ammoniac; (ii) produire un deuxième courant contenant au moins un élément choisi parmi l'acide sulfurique, l'acide phosphorique et leurs mélanges; (iii) produire un troisième courant contenant un liquide aqueux; (iv) mélanger les trois courants pour former un mélange réactionnel liquide; (v) introduire ce mélange réactionnel dans un mélangeur; (vi) introduire un quatrième courant comprenant du soufre fondu dans le mélangeur avant la solidification du mélange; et (vii) faire solidifier le mélange fondu homogénéisé pour produire l'engrais granulé contenant du soufre.

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