Chemistry: fertilizers – Processes and products – Inorganic material
Reexamination Certificate
2005-11-17
2010-06-29
Hendrickson, Stuart (Department: 1793)
Chemistry: fertilizers
Processes and products
Inorganic material
C071S035000, C071S037000
Reexamination Certificate
active
07744672
ABSTRACT:
The invention relates to the chemical industry and can be used while producing granulated nitrogen-potash fertilizers. An ammonia nitrate melt in the amount of 33-69 weight %, potassium chloride in the amount of 22-65 weight %, and a specific mineral admixture—phosphogypsum in the amount of 2-9 weight % are fed into a mixture as well as ammonia, which is necessary for keeping pH value of the mixture within the range of 6.5-7.5. The obtained slurry is sprayed onto a recycle product in a drum granulator and granulated under a recycle ratio being equal to 1:(2-2.5), the final product is dried. A stirring is carried out under the optimal operational mode within the temperature range of 100-130° C. during 20-30 minutes. Due to such conditions, a productivity rate of the process is increased and granules of the fertilizer have higher strength and reduced leachability from the soil.
REFERENCES:
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M.E. Pozin, Tekhnologiya mineralynykh udobreny, Leningrad, Khimiya, 1983, pp. 56-58.
Avramenko Anatoliy Nikolaevich
Gromotkov Victor Nikolaevich
Kononov Sergey Mikhailovich
Kontareva Evdokiya Nikolaevna
Kostuchenko Stanislava Stanislavovna
Fish & Richardson P.C.
Hendrickson Stuart
Open Joint Stock Company “Mineral and Chemical Company Eu
Rump Richard M
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