Production of high-quality liquid fertilizers from wet-process acid via urea phosphate
A pilot-plant process is described that purifies wet-process phosphoric acid for the production of a high-quality urea-ammonium polyphosphate base solution. An intermediate product, crystalline urea phosphate, is produced from urea and merchant-grade (54% P{sub 2}O{sub 5}) wet-process phosphoric acid. The urea phosphate crystals contain only about 15 to 20% of the objectional impurities (iron, aluminum, and magnesium) originally contained in the feed wet-process acid. The urea phosphate crystals are pyrolyzed, converting orthophosphate to polyphosphate with very little energy consumption. The resulting melt is dissolved and neutralized with ammonia to produce 14-29-0 liquid product of high polyphosphate content.
- Research Organization:
- National Fertilizer and Environmental Research Center, Muscle Shoals, AL (United States)
- Sponsoring Organization:
- Tennessee Valley Authority, Knoxville, TN (United States)
- OSTI ID:
- 10107254
- Report Number(s):
- TVA-Bull-Y-222; ON: DE93003878
- Resource Relation:
- Other Information: PBD: Jul 1991
- Country of Publication:
- United States
- Language:
- English
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