CS205503B1 - Method of stabilization of np solutions and suspended fertilizers - Google Patents

Description

Method of stabilization of NP solutions and suspension fertilizers

The invention relates to a method for stabilizing NP solutions and suspension fertilizers.

Gel-forming clays such as attapulgite, bentonite or illite are currently used to stabilize NP solutions and suspension fertilizers. Gel-forming clays are usually activated by the addition of sodium carbonate. They are dosed in amounts ranging from 0.5 to 3% by weight. based on the fertilizer weight.

A disadvantage of the method used to stabilize NP solutions or suspension fertilizers by the addition of alone or activated gel-forming clays is the fact that the stabilization is not perfect. A further drawback is that swelling of gel-forming clays requires a relatively long period of intensive mixing and the fact that gel-forming clays of different provenance are heterogeneous and have different properties. Gel-forming clays further increase the viscosity and impair the flow properties of the fertilizer.

It has now been found that these drawbacks can be largely eliminated by the method of the present invention. SUMMARY OF THE INVENTION The present invention provides a process for stabilizing NP solutions and suspension fertilizers, characterized in that an alkaline liquid silicate having a concentration of 0.5 to 60% by weight is added during its production. or solid and te in an amount of 0.01 to 10 wt. count205 503

%, Based on the weight of the fertilizer, and optionally also a gel-forming clay in an amount of 0.05 to 3% by weight. calculated on the fertilizer weight ·

The advantage of stabilizing NP solutions of slurry fertilizers with alkaline silicates and / or gel-forming clays and alkaline silicates is in particular the fact that alkali silicates can be dosed in the production process, the precipitated silicate gel suppresses crystallizable minerals. that the use of alkaline silicas with the activity of gel-forming clays skraeujo na mlalanm and thus eliminates the long mixing time required for the clay activity and the use of known reagents;

The advantage of alkaline silicates over natural gel-clays and clays, such as bomtonite, attapulglt or illlt, is that the silicates have a constant composition and, when used as a natural raw material, they homogeneize the properties of gel-forming clays with optimum efficacy.

Other advantages of stabilizing HP solutions and / or euepensive fertilizers according to the invention are that alkali silicates reduce viscosity and improve flow properties of the fertilizer compared to natural gel-forming clays. Alkaline silicate dosing may be lower compared to gel-forming clays, thereby achieving higher concentrations In addition, alkali silicates increase the active surface in the soil environment, where ion exchange proooses take place, thus helping to better utilize the supplied nutrients by plants and consequently improve the agrochemical properties of fertilizers · Alkali containing products can be used to distinguish different types of suspension fertilizers dye silicates with commonly used organic or mineral substances, which is not normally possible with fertilizers containing gollo-forming clays

According to the invention, the alkali silicates with gel-forming clays or the alkali silicates themselves can be dosed in aqueous quantities during the production of HP solutions produced by neutralizing phosphoric acid with ammonia, in the production of multi-silicone suspension fertilizers based on ammonium phosphates or on another basis

Examples

Example 1

Ko 2 kg of HP 8-24-0 solution free of organic impurities was added 200 g of 6% sodium silicate solution at 85 ° C with stirring. 98%.

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Example 2

The orthophosphoric acid was neutralized with ammonia to give a BP solution of 8.8-26.4-0, and at 85 ° C, 20 g of bentonite, which had been activated beforehand with 200 g of a 10% sodium silicate solution, was stirred at 85 ° C with stirring. . A slurry formed having a sedimentation volume of 99%.

Example 3

150 g of a 10% sodium silicate solution were added to a 2 kg HP solution of 8-24-0 extract phosphoric acid obtained at 65 ° C. With stirring, a suspension was formed within 10 minutes, which after 5 days showed a sedimentation volume of 99.5% ·

Example 4

To a BP solution of 8-24-0 obtained from phosphoric acid extraction at 200C, 200 g of 12.5% potassium silicate was added with stirring. Within 20 minutes a suspension was formed which showed a sedimentation volume of 99.2% after 5 days.

Example 5

To 2 kg of the BP suspension of 9.77-27.12-0 obtained from phosphoric acid extraction at 60 ° C was added 200 g of 10% sodium silicate solution with stirring. Within 5 minutes a suspension of 8.88-24.65-0 was formed having a sedimentation volume of 99.8%.

Example 6

500 g of nitrogen solution DAM 390 was heated to 80 ° C. At this temperature, 2 kg of solid fertilizer BPK 1 containing nutrients 12-19-19 were added successively with stirring. The resulting suspension was liquefied by the addition of 300 g of a 6% sodium silicate solution. The stabilized suspension obtained had a content of 15.5-13.6-13.6.

Claims (1)

OBJECT OF CARRIER Process for stabilizing BP solutions and suspension fertilizers, characterized in that, during its preparation, an alkaline liquid silicate having a concentration of 0.5 to 60% by weight is added. or solid, in an amount of 0.01 to 10 wt. calculated on dry weight and based on the fertilizer weight and optionally a gel-forming clay in an amount of 0.05 to 3% by weight. calculated on the fertilizer weight.