CS227622B1 - A method of anti-caking stabilization of industrial granular fertilizers - Google Patents

Abstract

The purpose of the invention is the anti-caking stabilization of industrial granular NPK fertilizers and ammonium nitrate by the synergistic effect of calcium salts of ligninsulfonic acids and aliphatic amines of the C10 to C20 range in a mineral oil environment. For surface treatment, an emulsion created by mixing a 20 to 50% aqueous solution of calcium salts of ligninsulfonic acids and a 5 to 5% solution of aliphatic amine of the series Cin to C2f) is used in mineral oil in a ratio of 0.5 to 2.0: 2.0 to 0.5 by mass. parts in the amount of 2 to 5 kg per 1 ton of fertilizer. When maintaining 100% flowability of the compost for at least 6 months, the consumption of amine is 5 to 6 times lower compared to applications known to date. An equivalent effect is achieved even if the above components of the emulsion are dosed separately.

Description

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The present invention provides a method of cohesive stabilization of NPK-type, 8-mole-type permeable granular fertilizers, with high anti-caking properties due to the lignin sulphonic acid calcium salts and the aliphatic amine alginate in the medium oil medium.

The aim of the surface treatment of granulated fertilizers is to reduce their sintering tendency. There are a large number of drugs and medications, with the help of which a certain anti-e-fect can be achieved, although not always at the desired level. For good separation properties, finely ground keolin, bentonite and the like are used for this purpose. By the use of these substances alone, it is impossible to achieve a sufficiently effective effect. Therefore, they are usually used in combination with hydrophobic substances to protect fertilizers from contact with atmospheric moisture, which have a large proportion of the increase in sinterability during the glass. transport and handling. Such substances are p8trianapr. mineral and vegetable oils. For NPK and ammonium nitrate fertilizers of hydrophobic nature, the most promising effects are the aliphatic amines, which are applied by spraying after heating to the desired temperature, either by separate blending with the oils. An example of the use of aliphatic amines for surface treatment of granulated fertilizers is the British patent. No. 1,312,314, which discloses a variety of compositions for surface treatment, wherein effective doses of fatty amines are about 0.3 kg per tonne of fertilizer. This effective eadobre dose corresponds to the results of our washing machines, where 100% of the NPK fertilizer type and emony after 6 months of storage and min. a dose of 0.3 kg of octadecylamine per tonne of granulate, wherein the amine was used in the form of a 10% - 2 - 227,822 solution in mineral oil. In addition, 3 to 5 kg of finely divided kaolin was added per ton of fertilizer.

Another type of surface treatment is the use of lime salts of lignin sulphonic acids in the production of pulp and paper. However, their effect lags behind the effect of fatty amines. Examples of their application are Polish patents δ. 70819 and No. 73598.

The use of fatty amines in the surface treatment of fertilizer is withdrawn by their high cost. On the other hand, calcium solignin sulphonic acids are cost-effective, but their lack of efficacy is not sufficient, especially if we want to achieve higher quality sintering fertilizers. To overcome the lack of caking efficacy of lignin sulfonic acid salts and, at the same time, to significantly reduce the consumption of aliphatic amines, in the context of the present invention, in which an emulsion is used for the surface treatment, is mixed with 0.5 to 2 wt. parts of 20 to 50% aqueous solution of calcium salts of ligninsulfonic acids and 0.5 to 2 wt. parts of a 3 to 5% solution of the aliphatic amine of the Ciq to CgQ range in mineral oil in a total amount of 2 to 5 kilograms per tonne of fertilizer with a distance of 2 to 5 kg of ground kaolin or bentonite. An equivalent effect can also be obtained if the two components of the emulsion are dispensed separately. In these cases, the granulate retains a 100% flow rate for 6 months of storage. The consumption of the aliphatic amine decreased from 5 to 6 times that of conventional applications. EXAMPLES Example 1 50 kg of granulated combined NPK fertilizer containing 15.7% N, 15.9% ρ2θ5 and 66% K20 with the following granular composition were mixed in a drum rotary mixer over 20 minutes: below 1 mm - 0.6 1 to 2 mm - 8.1%, 2 to 4 mm - 90.3% and above 4 µm - 1.0 r. Mixing time granulated with 60 ° C hot emulsion containing 48 % by weight of compressor oil J2 / product np % Slovnaft, CSSR /, 50 wt. 40% aqueous calcium salt solution lignin-3 - 227 622 sulfonic acid / cellulose waste / 2% cocadecylamine. A total of 0.15 kg of said emulsion was used for spraying. In another 10 minutes, the granulate was mixed with 0.15 kg of finely divided kaolin. The surface treated sabalil material was kg 5 kg in polyethylene bags, which were stacked 5 pieces in length for storage testing. To increase the pressure effects, the top bag was loaded with 125 kg iron plate. After 14 days of storage in a sealed room, the flowability of the product according to ČSN 654925 / sieve after dropping the bag from a height of 1 m was evaluated. At the same time, the uncoated granulate was stored. The treated product remained 100% after storage for 14 days - not loose. Untreated contained 35.1% sinter. Example 2

The procedure as in Example 1, only the granulate was sprayed concurrently with a 40% aqueous solution of lignin-sulfonic acid calcium salt and a 4% octadecylamine solution in compressor oil J2, while maintaining the doses of the individual surface treatment components as in Example 1. Fertilizer retained 100% flow after 14 days of storage. Example 3 Λ

The procedure as in Example 1. Instead of the combined fertilizer K NPK, an ammonium dolomite bait containing 27.8% N was used, with 92.7 wt. the granulate was in the range of 1 to 4 mm. The treated granulate remained 100% non-bulk after 14 days storage. Untreated fertilizer contained 21.4% of sinters.

Example4

The procedure as in Example 1, only the emulsion used did not contain octadecylamine and had a composition of: 25% lignin sulphonic acid calcium salt, 25% H 2 O and 50% compressor oil J 2 · NPK fertilizer of the same quality as in Example 1 was used for the test. After 14 days storage, the granulate contained 11.2% sinters.

Claims (1)

A method of antisense stabilization of industrial granulated NPK-type fertilizers and ammonium nitrate by the synergistic effect of the individual components at a temperature of 30 to 70 ° C, characterized in that from 0.5 to 2.5 wt. % of a 20 to 50% aqueous solution of calcium salts of ligninsulfonic acids and 0.5 to 2 wt. parts of a 3 to 6% solution of the aliphatic amine až až ⁱⁿ mineral oil are prepared and emulsion is sprayed evenly onto the surface of the granules in an amount of 2 to 5 wt. parts per 1000 wt. parts fertilizer, followed by the addition of 2 to 5 wt. parts of finely ground kaolin or bentonite.