Chemistry: fertilizers – Processes and products – Inorganic material
Patent
1977-02-16
1979-05-15
Hart, Charles N.
Chemistry: fertilizers
Processes and products
Inorganic material
71 34, 71 43, 71 44, 71 64DA, 422189, 423310, C05B 700
Patent
active
041545931
ABSTRACT:
A process for granulating ammonium phosphate containing composition for use as a fertilizer which comprises feeding a slurry or melt of ammonium phosphate, wherein said slurry or melt is capable of further reaction with ammonia, into a kneading mill, feeding recycled particles from the subsequent classification and crushing procedure into said kneading mill, wherein the said slurry or melt added to the mill is from 5 to 95% wt. of the total slurry or melt, feeding ammonia into said mill to react with at least a portion of the reactable components of said slurry or melt, generating a heat of reaction, subjecting said mixture to a kneading action within said mill until the heat of reaction and the kneading action cause a repeated disposition of fertilizer material onto the solids and cause a repeated drying of said deposit, passing the product from said kneading mill into a rotary drum granulator, feeding additional ammonium phosphate containing slurry or melt to a said granulator in an amount of from 95% to 5% wt. based on the total slurry or melt, feeding additional amounts of ammonia to said granulator wherein at least a portion of the reactable components of said slurry or melt is reacted, giving off a heat of reaction, subjecting said mixture to a rotary action until said heat of reaction and tumbling action of the rotary granulator effects a further deposition of fertilizer material onto the solids, passing the product from said granulator into a dryer so as to remove excess water, subjecting said dried product to a classification apparatus so as to separate out particles which are outside the product size range, recycling at least a portion of said particle mixture to said kneading mill, and recovering said dried particles of product size. Commensurate apparatus is provided to perform said process.
REFERENCES:
patent: T904033 (1972-11-01), Lee et al.
patent: 3005687 (1961-10-01), McKnight
patent: 3165395 (1965-01-01), McCamy
patent: 3384470 (1968-05-01), Reynolds
patent: 3540874 (1970-11-01), Stinson
patent: 3563723 (1971-02-01), Sackett
patent: 4017588 (1977-04-01), Davidson
Fertilizer Technology and Use, 1971, 1973, Second Printing, Soil Science Society of America, 381-385.
Manual on Fertilizer Manufacture, Sauchelli, 1963, Industry Publications Inc., 309-315.
Brown Marion L.
Johnson, III Charles A.
Tucker Gerald L.
Hart Charles N.
Mississippi Chemical Corporation
Therkorn Ernest G.
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