The method for conditioning granular fertilizers

 

(57) Abstract:

The invention relates to the production of mineral fertilizers, suitable for bulk transport and storage in bulk. The method of conditioning granulated mineral fertilizers and is applied to the surface of the granules dispersed particles of tall oil - product of wood processing, thus reducing the caking of fertilizers and increased agrochemical properties. table 2.

Usage: in the chemical industry for production of mineral fertilizers.

The invention relates to chemistry, in particular to a technology for producing granulated mineral fertilizers, suitable for bulk transport and storage in bulk.

Know the use of different reagents to reduce caking of fertilizers. For example, a solution of fatty acids (C6- C20in the mixture of higher fatty alcohols and high molecular weight component (RU 2010024C1, C 05 C 1/02, op. 30.03.94). However, when using this solution requires an additional step of drying the product, the conditioning additive contains a large amount of moisture - 75 - 95%. In addition, it is necessary to constantly monitor soothe hard enough.

The set of essential characteristics most similar to our proposed is a method for conditioning granular fertilizers - surface-active substance - contact Petrova (EN 20855501C1, C 05 G 3/00, op. 27.07.97). For prevention of caking of fertilizers this reagent, neutralized to pH 5 to 8, in the amount of 0.03 to 0.08% by weight of processed fertilizers in terms of 100% substance applied to the surface of the granules in the form of dispersed particles.

Contact Petrov - the mixture of sulfonic acids obtained by acid cleaning of oil obtained by the sulfonation diesel, spun oil or kerosene. Due to the fact that this conditioning additive highly corrosive environment there are serious difficulties during transportation.

For use of this reagent as a conditioning additive required additional costs: installation of technological node of neutralization solution and gaseous ammonia.

The efficiency of contact Petrov, as anticlimaxes reagent insufficient (table. 1).

The aim of the present invention is to reduce the caking of granular fertilizers.

those who P> Tall oil - derived product hardwood; is a mixture of resin and fatty acids mixed with their esters, anhydrides, and unsaponifiable substances.

Processing pellet fertilizer tall oils is carried out by any known means at a temperature of 40 - 100oC. While on the surface creates a protective film that reduces the bond strength of contact between granules, blocked the path of diffusion fluxes of water-salt complexes.

Our proposed method of conditioning can reduce caking of fertilizers and improve their agrochemical properties by reducing the dissolution rate of the pellets.

Consider the description of the present invention to the examples.

Example 1. Handling of ammonium nitrate granules tall oil with an acid number of n/m 96 mg KOH per 1 g of oil, with a mass fraction of waves up to 2% and a dynamic viscosity 42 mPas at a temperature of 60oC was carried out in a rotating drum - conditioning. The amount of reagent was 0.05 to 0.15% by weight of the processed product.

Comparison of properties of ammonium nitrate granules, the treated tall oil, and the control sample showed caking - force reslove oil in the amount of 0.05 - to 0.15 wt.% with the parameters described in example 1 was applied from nozzles on the surface of the moving layer of urea, the product was mixed with special devices.

Caking treated granules of urea against control decreased 2.4 times (table. 1).

Holding agrochemical tests showed that the processing of fertilizers tall oils increases the average yield of cereals and potatoes (table. 2) by regulating nutrients.

Thus, when processing of mineral fertilizers tall oils is reduced caking: n-p-K at 49%, urea 58% and improve their agrochemical properties.

Method of conditioning granulated mineral fertilizers are applied on the surface of granules dispersed particles of surface-active substances, characterized in that as the surfactant used product of wood processing - tall oil.

 

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