Pilot-plant studies of the pipe- and pipe-cross reactors in production of granular polyphosphate fertilizers. TVA Circular Z-148. [Methods of increasing polyphosphate content of suspension fertilizers]
Improvements have been made in the pipe-reactor or pipe-cross reactor/drum-granulator process to increase the polyphosphate content of the granular product. The goal of producing a granular APP product containing 20% of P/sub 2/O/sub 5/ as polyphosphate without adding external heat or sulfuric acid to the process has not yet been realized; however, products containing slightly more than 10% of the P/sub 2/O/sub 5/ as polyphosphate have been made without the need for external heat. Test results indicate that additions of small amounts of sulfuric acid, use of reactant NH/sub 3/:H/sub 3/PO/sub 4/ed mole ratios greater than 1.05, or use of some acid preheat may be required to consistently obtain 12% of the P/sub 2/O/sub 5/ as polyphosphate as is desired for use of the product in the preparation of suspension fertilizers. However, continued testing is being done to determine how high a mole ratio may be used successfully and to determine the effect of sulfate addition on use of the granular products for producing suspension fertilizers. The effort to obtain higher polyphosphate levels from the pipe-reactor and drum and the pipe-cross reactor and drum systems is being continued.
- Research Organization:
- National Fertilizer Development Center, Muscle Shoals, AL (USA)
- OSTI ID:
- 6638589
- Report Number(s):
- TVA/PUB-83/14; CONF-821095-1; ON: DE83900301
- Resource Relation:
- Conference: 32. annual meeting of the fertilizer industry round table, Atlanta, GA, USA, 26 Oct 1982
- Country of Publication:
- United States
- Language:
- English
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