Precipitation of impurities in 9-32-0 grade fluid fertilizers
Abstract
For several years TVA has been studying production of 9-32-0 ammonium polyphosphate suspension produced from ammoniated merchant-grade wet-process orthophosphoric acid. Suspensions containing polyphosphate have an advantage over those that contain only orthophosphate in that they can be stored satisfactorily at much lower temperature. However, the introduction of polyphosphate (pyrophosphate anion) complicates the precipitation of impurities and has yielded inconsistent storage characteristics in 9-32-0 fluid fertilizers. Fluorine also has been shown to affect suspension fertilizer properties. The viscosity of 13-38-0 orthophosphate suspension fertilizers is affected by the atomic ratios F:(Al + Fe + Mg). Addition of fluorine prevents sludges and precipitates in ammonium polyphosphate fertilizer solutions - the proper amount of fluorine is related to the amount of each of the metallic impurities present and also to the fraction of the phosphate present as pyrophosphate. Incorporation of polyphosphate or fluorine or both has been shown to have positive effects on ammoniated wet-process phosphoric acid (WPPA), but they do not report the solubility relationships of the cation impurities (Fe, Al, Mg, and Ca) with respect to the anion constituents (PO/sub 4/, P/sub 2/O/sub 7/, and F). Therefore, a factorial study was developed to determine the solubility relationships of the precipitated metal impuritiesmore »
- Authors:
- Publication Date:
- Research Org.:
- Tennessee Valley Authority, Muscle Shoals, AL (USA). Office of Agricultural and Chemical Development
- OSTI Identifier:
- 6071026
- Report Number(s):
- TVA/OACD-86/6
ON: DE86901143
- Resource Type:
- Technical Report
- Resource Relation:
- Other Information: Portions of this document are illegible in microfiche products. Bulletin Y-194
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; AMMONIUM PHOSPHATES; IMPURITIES; FERTILIZERS; CHEMICAL COMPOSITION; PRECIPITATION; CHEMICAL PREPARATION; EXPERIMENTAL DATA; FLUORINE; VISCOSITY; AMMONIUM COMPOUNDS; DATA; ELEMENTS; HALOGENS; INFORMATION; NONMETALS; NUMERICAL DATA; OXYGEN COMPOUNDS; PHOSPHATES; PHOSPHORUS COMPOUNDS; SEPARATION PROCESSES; SYNTHESIS; 400201* - Chemical & Physicochemical Properties
Citation Formats
Dillard, E F, Scheib, R M, and Greenwell, B E. Precipitation of impurities in 9-32-0 grade fluid fertilizers. United States: N. p., 1986.
Web.
Dillard, E F, Scheib, R M, & Greenwell, B E. Precipitation of impurities in 9-32-0 grade fluid fertilizers. United States.
Dillard, E F, Scheib, R M, and Greenwell, B E. 1986.
"Precipitation of impurities in 9-32-0 grade fluid fertilizers". United States.
@article{osti_6071026,
title = {Precipitation of impurities in 9-32-0 grade fluid fertilizers},
author = {Dillard, E F and Scheib, R M and Greenwell, B E},
abstractNote = {For several years TVA has been studying production of 9-32-0 ammonium polyphosphate suspension produced from ammoniated merchant-grade wet-process orthophosphoric acid. Suspensions containing polyphosphate have an advantage over those that contain only orthophosphate in that they can be stored satisfactorily at much lower temperature. However, the introduction of polyphosphate (pyrophosphate anion) complicates the precipitation of impurities and has yielded inconsistent storage characteristics in 9-32-0 fluid fertilizers. Fluorine also has been shown to affect suspension fertilizer properties. The viscosity of 13-38-0 orthophosphate suspension fertilizers is affected by the atomic ratios F:(Al + Fe + Mg). Addition of fluorine prevents sludges and precipitates in ammonium polyphosphate fertilizer solutions - the proper amount of fluorine is related to the amount of each of the metallic impurities present and also to the fraction of the phosphate present as pyrophosphate. Incorporation of polyphosphate or fluorine or both has been shown to have positive effects on ammoniated wet-process phosphoric acid (WPPA), but they do not report the solubility relationships of the cation impurities (Fe, Al, Mg, and Ca) with respect to the anion constituents (PO/sub 4/, P/sub 2/O/sub 7/, and F). Therefore, a factorial study was developed to determine the solubility relationships of the precipitated metal impurities encountered in 9-32-0 fluid fertilizers. 10 refs., 1 fig., 20 tabs.},
doi = {},
url = {https://www.osti.gov/biblio/6071026},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Jan 01 00:00:00 EST 1986},
month = {Wed Jan 01 00:00:00 EST 1986}
}