Cominco, Ltd.

Cominco Fertilizers Ltd.

Stewart G Bexton

John T Higgins

Gordon C Hildred

James G Whitham

A particulate sulfur-based 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 .mu.m. A process for producing a sulfur-based fertilizer is also described. The process comprises: (i) providing a first stream comprising ammonia; (ii) providing a second stream comprising a 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 provide a liquid reaction mixture; (v) feeding the liquid reaction mixture to a mixer; (vi) feeding a fourth stream comprising molten sulfur to the mixer; (vii) maintaining a pressure drop across the mixer of at least about 200 kPa to form a homogenized melt of sulfur-based fertilizer; and (viii) solidifying the homogenized melt to produce the particulate sulfur-based fertilizer.

Sulfur-based fertilizer and process for production thereof

A process is disclosed for the production of a urea sulfur fertilizer by mixing urea and molten sulfur to obtain a molten mixture and solidifying the molten mixture to obtain a homogeneous, solid, particulate urea sulfur fertilizer wherein the sulfur has particle sizes of smaller than about 100 micron. The process comprises passing molten urea and molten sulfur through a mixing device at a temperature above the melting points to produce a finely divided sulfur dispersed in urea with the molten sulfur added in amounts sufficient to produce said urea sulfur fertilizer, maintaining a pressure drop across said mixing device of at least about 200 kPa to form a homogenized melt of urea sulfur, and solidifying said homogenized melt by prilling or agglomeration.

Growing community of inventors

Calgary, Canada

Stewart G Bexton