# US 7,744,672 B2 · Process for producing a nitrogen-potash fertilizer

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- Number: US 7,744,672 B2
- Document ID: US7744672B2
- Status: Granted
- Kind: B2
- Application number: 11/719,674
- Filed: 2005-11-17
- Published: 2009-07-09
- Granted: 2010-06-29
- Earliest claimed: 2004-11-19
- Assignees: 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
- Web page: https://patentgrep.com/patent/US7744672B2

## CPC

- C05C 1/02: Granulation (apparatus B01J2/00); Pelletisation; Stabilisation; Colouring
- C05C: NITROGENOUS FERTILISERS

## 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.

## Claims

### Claim 1

A process for producing a complex granulated nitrogen-potash fertilizer, said process comprises a mixing of an ammonium nitrate melt with a solid potassium chloride and a specific mineral admixture, which reduces a leachability of the fertilizer from the soil, in the presence of ammonia, a dosage of ammonia is chosen under a condition to keep a pH value of the mixture within the range of 6.5-7.5, granulation of the mixture in a drum granulator and drying of the product, characterized in that phosphogypsum is used as the specific mineral admixture and the components are fed for the mixing under the following ratios, weight %: ammonium nitrate 33-69; potassium chloride 22-65; phosphogypsum 2-9; and granulation is carried out under a recycle ratio, which is a ratio between the final product and the recycle product, being equal to 1:(2-2.5).

### Claim 2 (depends on 1)

The process of claim 1, characterized in that the mixing of the components is carried out at the temperature of 100-130° C. during 20-30 minutes.