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Process for the production of solid urea-nitric phosphate fertilizer products |
| T105301 |
Process for the production of solid urea-nitric phosphate fertilizer products
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| Inventor: |
Sullivan, et al. |
| Date Issued: |
April 2, 1985 |
| Application: |
06/612,162 |
| Filed: |
May 21, 1984 |
| Inventors: |
Kim; Yong K. (Florence, AL)
Sullivan; Jack M. (Florence, AL)
Waerstad; Kjell R. (Colbert Heights, Tuscumbia, AL)
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| U.S. Class: |
206/524.8; 206/534; 206/540; 206/807; 220/273 |
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| Abstract: |
The present invention relates to the reaction of phosphate rock with nitric acid and urea to produce nitrogen-phosphorus containing slurries, which slurries may be granulated and dried to produce solid N-P fertilizer products with agronomically advantageous low pHs (1.1-4.0). Products with optimum physical and chemical properties were discovered by investigating the characteristics of each individual material as a function of the nitric acid acidulation ratio (mole ratio HNO.sub.3 :CaO) and the mole ratio urea:CaO present in each product. Acidulation ratios ranged from 1.2 to 2.1 while ratios urea:CaO ranged from 1.6 to 4.0. Selected products with optimum physicochemical properties are tabulated below:The products have excellent storage characteristics. The improved properties of these products result partially from the formation of a new compound, Ca(H.sub.2 PO.sub.4)(NO.sub.3).CO(NH.sub.2).sub.2, which was discovered during the course of the investigation that led to the instant invention. |
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