Process for the manufacture of sulfur-containing fertilizers

Details Process for the manufacture of sulfur-containing fertilizers Process for the manufacture of sulfur-containing fertilizers

C - Chemistry, Metallurgy

05

G

C05G 3/10 (2006.01) C05D 9/00 (2006.01) C05G 3/00 (2006.01)

Patent

CA 2164547

The invention relates to a process for obtaining sulfur- containing fertilizers. According to the invention, a substrate containing fertilizer particles is heated to a temperature above the melting point of sulfur and subsequently by admixing with the sulfur, the latter is melted by the heat provided by said preheated fertilizer particles, producing a homogeneous coating on the ferti- lizer particles. According to a preferred embodiment the temperature at which the fertilizer particles are heated will be in the range of 140°C to 280°C. Other materials may be added either into the phosphate or to the resulted mixture, having the purpose to modify the physical nature of the sulfur. The sulfur availability from the coated fertilizer particles may be adjusted by varying the temperature at which the fertilizer particles are heated. Typical examples of fertilizers useful for the process are: phosphate rock, superphosphate, monopotassium phosphate, triple superphosphate and potassium chloride.

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