RU2233822C1 - Method for preparing nitrogen-potassium fertilizer - Google Patents

Abstract

FIELD: agriculture, fertilizers.

SUBSTANCE: invention relates to a method for preparing nitrogen-potassium fertilizer. Method involves feeding ammonium nitrate with humidity 7.5-15% taken in the amount 17-78 wt.-% as measured for a dry matter for mixing at medium pH 6.5-7.5, and also potassium chloride in the amount 10-47 wt.-% and ammonia is fed in the amount 0.8-18 wt.-%, zeolite in the amount 2-6 wt.-%, magnesium phosphate in the amount 1-3 wt.-% and ammonium sulfate in the amount 1-2.8 wt.-% or magnesium sulfate in the amount 1-4 wt.-% and ammonium sulfate in the amount 1-2 wt.-% additionally. Granulation is carried out in drum granulating device. The prepared fertilizer contains nutrient components in the following ratio, wt.-%: N, 15-30; K₂O, 11-30. The yield of commercial fraction in the prepared condition product is 95%, not less, that during storage doesn't loss high strength and 100% of its friability.

EFFECT: improved preparing method.

2 cl, 1 ex

Description

The invention relates to methods for producing nitrogen-potassium fertilizer and can be used in the chemical industry.

A known method of producing nitrogen-potassium fertilizer, comprising mixing a mixture of ammonium nitrate with potassium chloride, granulating the mixture in a drum granulator and drying (RF patent No. 2154620, class C 05 C 1/02, 08/20/2000 - analogue and prototype).

The disadvantage of this method is the low consumer properties of nitrogen-potassium fertilizer.

The technical result of the invention is to increase the consumer properties of nitrogen-potassium fertilizer by reducing losses of the nitrogen part of the fertilizer when they are applied to the soil and increasing the productivity of the method.

This is achieved by the fact that ammonia nitrate with a moisture content of 15-7.5% in an amount of 17-78 wt.%, In terms of dry matter, potassium chloride in an amount of 10-47 wt.% And additionally ammonia in an amount of 0 is fed to the mixing , 8-18 wt.%, Zeolite in an amount of 2-6 wt.%, Magnesium phosphate - 1-3 wt.%, Ammonium sulfate - 1-2.8 wt.% Or magnesium sulfate - 1-4 wt.%, ammonium sulfate - 1-2 wt.%, mixing is carried out with stirring at a pH of 6.5-7.5 and a temperature of 110-140 ° C, to obtain fertilizer containing nutrient components in the ratio, wt.%:

N 15 - 30

K ₂ O 11 - 30

Moreover, during the drying process, the temperature of the granules at the outlet of the drum is maintained at 85-95 ° C.

The invention is illustrated by the following examples.

The mixer serves melt of ammonium nitrate with a moisture content of 15-7.5% in an amount of 17-78 wt.%, In terms of dry matter, potassium chloride in an amount of 10-47 wt.%.

Additionally served ammonia in an amount of 0.8-18 wt.%, Zeolite in an amount of 2-6 wt.%, And also, in the first example:

magnesium phosphate - 1-3 wt.%, ammonium sulfate - 1-2.8 wt.%.

Or, in the second example: magnesium sulfate - 1-4 wt.% And ammonium sulfate - 1-2 wt.%.

The additional introduction of zeolite helps to increase the strength of the granules and the translation of part of the fertilizer in a prolonged form.

The introduction of a mixture of magnesium phosphate and ammonium sulfate or magnesium sulfate and ammonium sulfate improves the quality of molding and hardening of granules, increasing the safety of storage and consumption of fertilizers. The introduction of ammonia helps maintain the pH, regulate the nitrogen content and obtain nitrogen in the fertilizer additionally in the ammonium form. Mixing is carried out with stirring at a pH of 6.5-7.5 and a temperature of 110-140 ° C.

Then the granulation of the resulting mixture is carried out in a drum granulator and drying in a drying drum.

During the drying process, the temperature of the granules at the outlet of the drum is maintained at 85-95 ° C.

At the exit from the drum, in both examples, a fertilizer is obtained containing, wt.%:

N 15 - 30

K ₂ O 11 - 30

depending on the amount supplied to the mixing of the starting components.

The result is a conditioned product with a yield of at least 95%, which during storage does not lose high strength and 100% friability. In addition, the addition of zeolite enriches the fertilizer with a complex of nutrients, including trace elements.

Thus, when using the invention, the consumer properties of potassium nitrogen fertilizer are improved.

Industrial applicability.

The invention can be used in the chemical industry in the production of granular nitrogen-potassium fertilizers.

Claims (2)

1. A method of producing nitrogen-potassium fertilizer, comprising mixing a mixture of ammonium nitrate with potassium chloride, granulating the mixture in a drum granulator and drying, characterized in that ammonia nitrate with a moisture content of 15-7.5% in an amount of 17-78 wt. .%, calculated on the dry matter, potassium chloride in an amount of 10-47 wt.% and additionally serves ammonia in an amount of 0.8-18 wt.%, zeolite in an amount of 2-6 wt.%, as well as magnesium phosphate - 1 -3 wt.% And ammonium sulfate - 1-2.8 wt.% Or magnesium sulfate - 1-4 wt.% And ammonium sulfate - 1-2 wt.%, Mixed e is performed under stirring at pH 6.5-7.5 and a temperature of 110-140 ° C to obtain a fertilizer containing nutritional components in the ratio, wt.%: N 15-30 K ₂ O 11-30 2. The method according to claim 1, characterized in that during the drying process, the temperature of the granules at the outlet of the drum is maintained at 85-95 ° C.