SU1119999A1 - Concentrated galss-like potassium phosphate fertilizer - Google Patents

Abstract

A CONCENTRATED GLASS-CONTAINING KALIYPOSPHATE FERTILIZER containing ZnO, CaO, MgO, CuO, NajjO, MnOj, MoO, characterized in that, in order to expand the limits of the rate of fertilizer dissolution in the soil, reduce the hygroscopicity of the product and improve the chemical chemistry. O, COg-Oj,, SOj in the following ratio, wt.%: S (L

Description

QD WITH

o The invention relates to the production of mineral fertilizers, in particular potassium phosphate fertilizers by heat treatment of potassium and phosphorus-containing raw materials. Known concentrated glass-shaped potassium phosphate fertilizer based on potassium metaphosphate comprising, May. %: potassium metaphosphate 8085; zinc metaphosphate 2-4i cobalt metaphosphate 0.1-1; copper metaphosphate 0.01 0.2 ;, calcium and magnesium metaphosphate else. However, glassy fritted uterines containing oxynitride of phosphorus strongly agglomerate and tend to crystallize, which drastically changes their water solubility. Fertilizer based on potassium metaphosphate, which includes calcium and magnesium metaphosphates and some trace elements, although it can be obtained in a glassy state, but the frit of these fertilizers, even in the glassy state, is very hygroscopic and has an unstable temporation rate in time. The complex of microelements in this fertilizer is also far from complete. These drawbacks make it difficult to manufacture, transport and transport these fertilizers and do not provide a stable transfer of nutrients (potassium, phosphorus and trace elements) to the soil for a long time. The closest to the invention to the technical essence and the achieved result is a granular complex fertilizer based on phosphate-potassium glass C2} including PjQj - KjO and trace elements in the form of MgO, ZnO, CaO and CuO, as well as additionally containing Na20, e, Q, , Mn О, BjO and MoOj in the following ratio of components, wt.%: 20.0-40.0 2.0-0.5 20.0-1.8 0.5-1.0 0.3-1, 0 0.1-1.0 0.03-0.1 0.05-0.2 0.09-0.3 0.025-0.1 Else The disadvantage of this composition is the narrow limit of the fertilizer dissolution rate, low agrochemical properties and hygroscopicity of the product. The purpose of the invention is to expand the limits of the rate of fertilizer dissolution in the soil, decrease the hygroscopicity of the product and improve the agrochemical properties. The goal is achieved by the fact that glassy potassium phosphate is a fertilizer containing Kj, 0, P-0 / - „l f..r p, 4.,„ I ZnO, CaO, MgO, CuO, N3.0, MnOj, MoO3, FejOj, additionally with holds, COgOj,, SO in the following ratio of components, wt.%: 0.1-0.5 0.5-5.0 0.5-5.0 0.05-0.2 0.2 -3.0 0.1-2.0 0.1-0.5; 0.05-0.1 0.1-0.5 0.1-5.0 0.01-0.1 0.001-0.05 0.1-0.5 The proposed and lime compositions differ in the ratio of QO and very substantially from the point of view of glass formation and as a fertilizer compensating for the output of potassium and phosphorus from the soil. If, in the proposed composition, the molar ratio K 0 0: corresponds to metaphosphates, easily forms glass, and is close to the traditional ratios of these oxides in tuk, in the known composition this ratio is within 2.2: 1 and corresponds to pyrophosphates. Compositions 1-3 have been prepared for the preparation of fertilizer. Compositions 1 and 3 are cooked in ovens with carborundum heaters in 1 L quartz crucibles. The amount of charge charged is 2.5 kg. Cooking is carried out at 12501300 ° C for 1 hour. The resulting melts are granulated by casting in cold water. For cooking the composition prepared 2 tons of the mixture. The cooking is carried out in an electric continuous stove with indirect heating. Max / max temperature above the mirror

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melt. The melt is granulated. Compositions 1-3 are heated in quartz crucibles by casting into water. in a furnace with carborundum heaters In the table. 1 shows examples of targets at 1250–1300 s for 1 h of 1-3 lagged and known 4 and 5 soe- melts are cooled by casting metal fertilizers on a metal plate 5 in the form of glass.

Table 1

In tab. Table 2 gives a comparative assessment of the hygroscopicity and solubility, and shows the wide possibilities for regulating the rate of dissolution of the fertilizer of the proposed formulations.

The known composition 5 is completely soluble in water, which is to be expected, based on the high molar ratio of 20 and KjO: 2.2; 1.0 The high dissolution rate of the known fertilizer significantly shortens, as compared with that proposed, the time of longed action. In addition, the known-25 composition has a hygroscopicity several orders of magnitude higher than what is proposed, which leads to its caking and difficult storage, transport Table 2

tirovka and entering into the soil. Granules of a known fertilizer (composition 5, Table 1) 1 h after the synthesis, stick together with each other.

1 The use of concentrated glassy potassium phosphate fertilizer instead of traditional superphosphate and potassium salts allows reducing the tonnage of transported fertilizers by 3-4 times, 3–8 times reducing the labor capacity of fertilizer introduction to the soil.

Claims (1)

Concentrated glassy potassium phosphate fertilizers containing K _r 0, P ₂ 0 _5, ZnO, CaO, MgO, CuO , B ^ 0 _3, Na ₂ O, MnO _2, Mo0 _3, Fe ₂ 0 _3, wherein e c i in that , in order to expand the limits of the rate of dissolution of fertilizers in the soil, reduce the hygroscopicity of the product and improve the agrochemical properties, it additionally contains A ^ O, ε ° 2θ3> ^v ₂ ° 5 ' ^SO j ^p ₽ ^{and the} following ratio of components, wt.%: to ₂ o 20-45 ^P 2 ° C 45-70 Zno 0.1-0.5 CaO. 0.5-5.0 MgO 0.5-5.0 CuO 0.05-0.2 ^At 2 ° 3 0.2-3.0 Na ^ 0 0.1-2.0 MnO ₂ 0.1-0.5 3 Mo0 _e 0.05-0.1 " Fe ₂ O _a 0.1-0.5 (L Αί _? 0 0.1-5.0 V g 2 3 Co ₂ 0 0.01-0.1 FROM V ₂ o / 0.001-0.05 ¹ so ₅ 0.1-0.5 s © s © s © ζ © >