DE1244815B - Method for improving the rate of dissolution of crushed grains consisting of plant nutrients in soil fluid - Google Patents

Description

Process for improving the speed of dissolution of crushed grains consisting of plant nutrients in the soil liquid It is known to agglomerate powdered plant nutrients by granulation or by pressing processes, on the one hand to avoid annoying dust and on the other hand to obtain products that are stable in storage and shipping. The stability of the products thus obtained to mechanical influence while naturally the greater, the higher the pressing pressure applied during agglomeration, but this increased stability due the other hand, - slow disintegrability and solubility.

This is particularly true for plant nutrients that are under high Pressure is pressed into plates, compacts and then crushed into so-called crushed grain have been. They disintegrate on or in the ground so slowly that the advantage of the increased mechanical stability is thus repealed to a considerable extent. The present invention leads to plant nutrients that are solid and as crushed grain are stable, but still easily disintegrate in the ground or on the ground.

According to the invention, a powdery per-compound, preferably a peroxyborate, percarbonate, persulfate or perphosphate or a corresponding hydrogen peroxide addition product, is added to the plant nutrient or plant nutrient mixture prior to pressing, which decomposes in aqueous solution with release of oxygen. The amount added is 0.05 to 5, preferably 0.1 to 1 percent by weight. - The mixture obtained is then pressed into sheets or other shaped bodies and then crushed into crushed grain.

If you bring the crushed grain thus obtained from z. B. Thomas flour, finely ground, optionally digested rock phosphate, their mixture with one another and / or with other plant nutrients on the ground, then escapes under the influence of moisture oxygen from the per compounds contained in the crushed grain relatively quickly.

This process is quite impressive and can already be seen with the naked eye: The grain is covered with a foaming or bubbly layer on the surface, which remains until all the oxygen in the per-compounds has escaped. Under his influence, the initially very hard and largely insoluble grain, produced at pressures of 0.5 to 4 ts / cm length of the press rolls and then broken, gradually dissolves; it disintegrates with the release of hydrogen peroxide or oxygen, which at the same time has a disinfecting effect is exercised in the ground, in material with the original starting structure.

It goes without saying that the components of the fertilizer or The fertilizer mix must be as dry as possible to prevent premature decomposition turn off. It goes without saying that the nutrient mixture does not contain any May contain connections that could be implemented with the Per connections, for example nitrates or nutrients that contain free acids.

From French patent specification 645 166 it is known to mix powdered fertilizers with potassium permanganate. The oxidizing power of this additive should increase the nitrifying soil bacteria and improve the assimilation of the organic soil components.

According to the other French patent specification ffl 266 by the same inventor, these processes are to be accelerated by more rapid decomposition of the permanganate, which is to be achieved by adding an alkali metal formate; in this case H " 0, and CO, occur (cf. p. 1, line 21 ff.).

The purpose of the Permanganatzusatzes is in both cases mainly the growth promotion of beneficial soil bacteria is by suppressing the protozoan (see FIG. French Patent 840,266, page 1, line 58 et seq., As well as page 2, line # ff .; add a catalytic action of the Manganese (see p. 2, line 28 ff.).

This objective is completely different from that of the present invention. Here it is important to disintegrate the very hard crushed grain, which cannot be compared with the powdery products of the French patent specifications mentioned; In contrast, the disinfecting effect plays a subordinate role. This is also evident from the lower dosage, because the preferred additional range is 0.1 to 1 percent by weight compared to 6 "/", which French patent 645 166 describes as the optimum.

The French patent specification 1175 161 cannot suggest the idea of incorporating a per compound into a fertilizer in the form of crushed grain in order to make it easier to disintegrate in the soil. This patent describes a definite micronutrient or trace element fertilizer based on potassium and magnesium, which contains B, 0 "Cu, Mii, Fe, Sn and Zn. The product is granulated, the task of which is to break down crushed grains therefore not posed at all; B, 0, would not be able to do this at all.

B ice p y 1 In a Lodige mixer Thomas flour is intimately mixed with 1 weight percent of finely powdered sodium perborate, compressing the resulting mixture in a roller press and then crushed to grain crushing.

The grains between 1 and 3.5 mm in size are sieved off from the crushed grain obtained. The oversized grain is fed back to the crusher and the fine material with a grain size of less than 1 mm is fed back to the pressing process. The yield of grains ready for sale is about 76.50 /.

The grains obtained in this way dissolve in water with vigorous evolution of oxygen, which becomes visible on the surface of the grains, gradually up and down Thomas flour grain pressed under high pressure disintegrates again into its original fine flour consistency.

For comparison, without the addition of perborate under the same pressure On the other hand, Thomas meal that is pressed into plates and then crushed dissolves in Water, even after standing for a long time or, partly, not up.

For example, the following per compounds are suitable for the method according to the invention: Carbamide peroxide (NH2), 1190-211 ammonium or potassium peroxodisulphate . (NHI) 2S20 "K2S201 (persulfate), sodium percarbonate Na2 (CIOJ, sodium perborate NaB02 - H, 0" - 3 11.0, sodium or potassium peroxodiphosphate Na4P20 "K4P208 (perpyrophosphate), sodium peroxomonophosphate ( OH,) PO - OONa, (perorthophosphate).

Claims (1)

Patent claim: A method for improving the speed of dissolution of crushed grains consisting of plant nutrients in the soil fluid and for accelerating the disintegration of the crushed grains in the soil, characterized in that a powdery per compound, in particular a peroxyborate, per carbonate, persulfate or a peroxyborate, percarbonate, or persulfate, is added to the plant nutrient or the plant nutrient mixture prior to pressing Perphosphate or a corresponding hydrogen peroxide addition product, is added in amounts of 0.05 to 5 percent by weight, in particular 0.1 to 10 / ", which disintegrates in aqueous solution with the release of oxygen. Considered publications: C French Patents No. 645 166 , 840 266, 1175161.