SU859340A1 - Method of producing granulated potassium fertilizers - Google Patents

Description

(54) METHOD OF OBTAINING GRANULATED V POTASSES OF FERTILIZER The ogrefaction to the use of granulated potassium fertilizers could be applied in agriculture for plant pigments and neutralizing acidic soils. A method of producing granulated potash fertilizers is known by moistening the initial mixture with lime together with a concentrate of sulfite-alcohol stillage. Lime taken in the amount of 1-4%, and the concentration of sulfite-alcohol bards in the amount of 2-6% by weight of the mixture. At the same time, the strength of the granules reaches 13O kg / cm ij. The disadvantages of this method are the use of complex additives and the production of granules of relatively low strength. The closest to the proposed technical essence and the achieved result 1 is the method of granulated potassium fertilizers, which consists in the fact that the initial potassium magnesium is moistened with hot water in the mixer to a given final humidity. The heated and moistened product is fed to the pressing followed by crushing 2. The disadvantages of this method are the low strength of the granules, the possibility of using these fertilizers only for neutral soils and high dustiness during transportation of dry material. The purpose of the invention is to increase the granularity of the granules and to improve the agrochemical properties of the product by creating the possibility of using them on acidic soils. The goal is achieved by the fact that in the known method of granulated potash fertilizers by moistening the initial potassium magnesia with subsequent granulation of the heated product, pressing with crushing, moistening is carried out with a solution of milk of lime containing 2.8-14% CaO in an amount of 210% by weight of the mixture . With the introduction into the process of obtaining granulated calmagneaia lime

milk with a CaO concentration of less than 2.8%, the strength of the granulate does not increase as compared with the prescribed one. An increase in the CaO concentration of more than 14%, the strength of the granule increases slightly with high economic costs.

The amount of milk of lime injected into the process depends on the moisture content of the source material - dry potassium magnesia and the concentration of milk of lime. When the moisture content of the source material is more than 5%, the consumption of milk of lime should be at least 2% by weight of the charge. When the moisture content of the source material is less than 5%, the consumption of milk of lime should not exceed 1O% of the weight of the charge. With an increase in the moisture content of the product entering the granulation, the strength of the granulate decreases and the energy

expenses.

Example. 1 kg of Kalimazia with a moisture content of 1% moistened 10O g of milk of lime solution with a concentration of 2.8%. The mixture is thoroughly mixed, heated in a mold and pressed. The resulting tile is subjected to a crush test. The strength here is 561 kg / cm, which is 2.24 times the strength of the tile according to the regulations. The pH of the saturated fertilizer solution is 1O.

Example 2. 1kg of potassium magnesia with a moisture content of 2% moistened with 6O g of milk of lime solution with a concentration of 2.8%.

The mixture is thoroughly mixed, heated in a mold and sheessuyut. The resulting tile is subjected to a radar test. The strength of this is 752 kg / cm, which exceeds the strength of the tile according to the regulations by a factor of 3.0. The hydrogen index of saturated fertilizer is 10.

Example 3. 1 kg of potassium magnesium with a moisture content of 2% is moistened with 6O g of a solution of milk of lime with a concentration of 9%. The mixture is thoroughly mixed, heated in a mold and pressed. The resulting tile is subjected to a crush test. The strength of this gfy is 600 kg / cm, which exceeds the strength of the tile according to the regulations 2.4 times. The pH of the saturated fertilizer solution is 10.

Example 4. 1 kg of potassium magnesium with a moisture content of 3% is moistened with 20 g of milk of lime solution with a concentration of 14%. The mixture is thoroughly mixed, heated in a mold and pressed. The resulting tile is subjected to a crush test. The strength here is 590 south / cm, which is 2.4 times the strength of the tile according to the regulations. The pH of the saturated fertilizer solution is 10.

The table shows the comparative data for the preparation of granulated potassium magnesium by the proposed and known methods.

The temperature in the mines presses, with

Pressure in mines of presses, at

2 Tile strength, kg / cm,

Thus, the implementation of the proposed method allows to increase the strength of the Kalnagnesia tile by a factor of 2–3, to obtain a qualitatively new fertilizer for acidic soils, to reduce the dust content in workplaces, galleys and to improve working conditions.

1OO

100 564-752

Claims (2)

Invention Formula The method of obtaining granulated capillary fertilizers by moistening the initial potassium magnesia followed by granulation of the heated product by pressing and crushing, characterized in that. 5 8593406 that, in order to increase the strength of the granules1. USSR authorship and improving agrochemical properties. C 05 D 1/02, 1974. product, moistening is carried out with a solution of 2. Technological regulations No. 72vestkovs: on milk, containing 2.8-14% 79 tie granulation of potassium magnesia CaO in the amount of 2-10% of the weight of the charge. 5 Pressing an ore at the processing plant) Information sources on the risk of granulated potash fertilizers. taken into account in the examination of p / A-3640 (prototype).