SU1567559A1 - Method of obtaining granulated complex fertilizer - Google Patents

Abstract

The invention relates to a process for the preparation of a complex fertilizer used in agriculture, and contributes to the simplification of the process with the simultaneous formation of strong and non-caking granules of a given size. According to the invention, the phosphate rock is mixed with the mineral component, granulated and dried. Water-soluble salts of potassium, ammonium or their mixtures are taken as the mineral component, and mixing and granulation are carried out simultaneously in carbon tetrachloride with a mass ratio of carbon tetrachloride - water-soluble salts - phosphorite fines equal to 75 - 275: 0.3 - 0.5: 1, 6 respectively. Salts of potassium chloride and potassium sulfate are used as water-soluble potassium salts, and ammonium sulfate, ammonium nitrate and ammonium chloride are used as ammonium salts. The method makes it possible to simultaneously obtain an non-caking complex fertilizer and completely eliminate the stage of processing the finished granules with anti-caking additives when the process is carried out for 2 minutes. 2 hp f-ly, 2 tab.

Description

The invention relates to a method for producing a complex fertilizer used in agriculture.

The aim of the invention is to simplify the process.

The invention is illustrated by the following examples.

Example I. 1 g of phosphate and 0.16 ml of 40% (NH4) jS04 are loaded simultaneously into 30 ml of CC14. The three-phase system is stirred at 600 rpm for 2 minutes. The resulting granules are separated from the dispersion medium and dried. The granules are obtained with a size of 2-3 mm, they do not clot, they are easy flowing. The ratio of the components of the apolar medium – polar liquid – powder is 75: 0.3: 1.6.

PRI mme R 2. To 50 ml CC. 1 g of phosphorite and 0.2 ml of 10% KCl are added simultaneously. The resulting system is stirred at 600 rpm for 2 minutes. The granules are separated and dried. The size of granules is 1-3 mm. Granules are loose and not clotted. The ratio of the components 125: 0,33: 1,6.

Example 3. To PO ml CC1, 1 g of phosphorite and 0.1 ml of 30% (NH4) 2SOf and 0.1 ml of 10% KCl are simultaneously added. The three-phase system is stirred at 500 rpm for 2 minutes. The resulting granules are separated from the dnesl.

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persion medium and dried. The granules are easy to flow and do not clot. The ratio of the components is 275: 0.23: 1.6.

PRI me R 4 (beyond the limit).

1 g of Aksai phosphorite is suspended in 90 ml of CCl. and at the same time 0.3 ml of 20% is added. The three-phase system is stirred for 2 minutes at a speed of 1000 rpm. The ratio of components is 225: 0.51: 1.6.

PRI me R 5 (extreme values).

1 g of phosphorite is suspended in 100 m CC1 and at the same time 0.15 ml of 20% (NH4) SO is added. The three-phase system is stirred at 900 rpm for 2 minutes. The resulting granules are separated and dried. After sieving on the sieves, a large amount of the initial phosphorite powder remains. The ratio of the components is 250: 0.26: 1.6.

PRI me R 6 (extreme values). 1.5 1 of phosphorite is suspended in 80 ml of CC14 and 0.2 ml of 20% is simultaneously added. The three-phase system obtained is stirred at 700 rpm for 2 minutes. The granules are separated and dried. After screening, a large amount of ungranulated phosphate powder remains on the screens. The ratio of the components 200: 0,33:: 2,4.

PRI m e (extreme values). To 25 ml of CC1-4, 1 g of phosphate and 0.16 ml of 20% KCl are simultaneously added. The three-phase system is stirred at 600 rpm for 2 minutes. The granules did not work, because the mixture acquires a pasty state due to the high concentration of the solid phase in the dispersion apolar medium. The ratio of components is 63:: 0.28: 1.6.

Example To 60 ml CCl. 1 g of phosphorite and 0.13 ml of 15% KCl and 0.15 ml of 30% (NH4) SO4 are added simultaneously. The obtained three-phase system (the subject is stirred at 800 rpm for 2 minutes. The granules are separated and dried. The granule size is 1-2 mm, it is easy to pour and does not follow. The ratio of ingredients is 150: 0.5: 1.6.

stir at 500 rpm for 2 minutes. Pellets with a size of 2-3 mm are separated and dried. The granules are easy to pour and do not cake. The ratio of components 200: 0,46: I, 6.

Granules of complex mineral fertilizers obtained by the proposed method contain water-soluble potassium or ammonium salts or their mixtures and phosphate rock, the quality of which is assessed by the amount of phosphorus soluble in weak acids. Most often, 2% citric acid and ammonium citrate solution are used to assess the quality. The availability of necessary elements for plants is shown in Table. one.

Table 1

Content

Data caking and strength of the granules obtained by the proposed method are given in table. 2

table 2

Example9. 1 g of phosphorite is suspended in 80 ml of CC14 and at the same time 0.23 ml of 10% is added. The obtained three-phase system in the proposed method, the mineral components are used in the form of solutions of different concentrations and, being a polar liquid, perform two functions at once. On the one hand, they are a binder, on the other hand, one of the components that make up the fertilizer, which is a positive aspect of the invention, since no ballast materials are introduced into the granule.

The ratio between the components of the three-phase system apolar medium (carbon tetrachloride) polar liquid - powder is selected on the basis of experimental data and is within (mass) 75-275: 0.3-0.5: 1.6.

The advantage of the proposed method of granulating fertilizers is that the method allows to simultaneously obtain non-traceable complex fertilizers and completely eliminate the stage of processing the finished granules with anti-caking additives. In comparison with the methods of the present invention, the granulation is carried out for 2 minutes.

Claims (3)

Invention Formula I. A method of obtaining a granular complex fertilizer, which includes mixing phosphorite fines with a mineral component, granulating and drying a product, characterized in that, in order to simplify the process, odoric salts of potassium, ammonium or their mixtures are taken as a mineral component, and mixing and granulation lead at the same time in carbon tetrachloride with de at a mass ratio of carbon tetrachloride - water soluble salts - phosphorite fines, equal to 75-275: 0.3-0.5: 1.6, respectively. 2. The method according to claim 1, wherein, as water-soluble potassium salts, potassium chloride salts and potassium sulfate are used. 25 3. A method according to claim 1, characterized in that ammonium sulfate, ammonium nitrate and ammonium chloride are used as water-soluble ammonium salts.