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.
Type:
Grant
Filed:
November 17, 2005
Date of Patent:
June 29, 2010
Assignee:
Open Joint Stock Company “Mineral and Chemical Company EuroChem”
Inventors:
Sergey Mikhailovich Kononov, Anatoliy Nikolaevich Avramenko, Oleg Anatolievich Shirobokov, Victor Nikolaevich Gromotkov, Victor Filippovich Perepechko, Victor Alekseevich Tzarevskiy, Igor Andreevich Mitzak, Vyacheslav Mikhailovich Ovchinnikov, Stanislava Stanislavovna Kostuchenko, Evdokiya Nikolaevna Kontareva