Granulated potassium sulfate production process

FIELD: inorganic substances technology.

SUBSTANCE: invention relates to production of granulated potassium sulfate appropriate for use in chemical industry for manufacturing mineral fertilizers and in agriculture as chlorine-free potassium-containing fertilizer. Process according to invention comprises spraying binding component onto dry potassium sulfate powder while simultaneously mixing materials in granulator mixer followed by drying thus formed granules to residual moisture not exceeding 1%. As binding component, liquid potassium soap or 50% solution thereof is used on the basis of 8 g binder per 100 g potassium sulfate. Once spraying of binding component ended, dry potassium sulfate is supplied through screw feeder to support growth of granules.

EFFECT: enabled production of granulated potassium sulfate in the form of non-caked and non-dusting product with stable granulometric composition and loose density, which contains high amount of basal substance (at least 51% K2O).

2 cl, 2 tbl

 

The invention relates to a technology for simple chlorine-free potassium fertilizers, in particular granular potassium sulfate used in the chemical industry in the production of mineral fertilizers, as well as in agriculture to increase yields of many crops are adversely affected by chlorine ion.

There are a large number of methods for producing potassium sulfate using as raw material natural potash ores. So, there is a method of production of potassium sulfate by reacting potassium chloride with sulfuric acid in mechanical muffle furnace at a temperature of 500-550°C. By this method have a highly pure potassium sulfate, however, the necessity of using sulfuric acid limits its spread in the industry. The disadvantage of the product obtained in this way is unstable particle size, high flaking, caking during storage and transportation [1].

Closest to the invention to the technical essence and the achieved effect is a method for granulated potassium sulfate by wetting the finished powder product water, okutyvaya in rotating drums or disc granulators and further drying the obtained granules [1].

The disadvantage of this method is to obtain granules of n is high strength, prone to fracture under impact loading, transportation and handling.

The aim of the invention is to provide a method for granulated potassium sulfate with improved consumer properties.

This goal is achieved by a method for granulated potassium sulfate, based on the dispersion of the binder component to the dry powder of potassium sulfate while stirring in a mixer-granulator, followed by drying the obtained granules to a residual moisture content mass fraction of not more than 1%. A distinctive feature is that, as a binder component used liquid potash glass or 50 wt.% aqueous solution per 100 g of potassium sulfate not less than 8 g of the binder. In addition, to ensure the growth of the granules after spraying a binder through a screw feeder serves dry potassium sulfate.

This set of features of the method is new and involves an inventive step, as it provides improvement of consumer properties of sulphate of potash.

The method is as follows:

Example No. 1.

The potassium sulfate in the form of dry powder is placed in a mixer-granulator, include the drive chamber and the drive rotor granulator. From a mechanical atomizer serves binder: liquid glass, an aqueous solution of liquid is about glasses, the water content in the product moisture not more than ≈13%.

The results of the experiments are shown in table 1.

Table 1
The size of the pellet (fraction)No EXPERIENCE
No. 1 dry product: potassium sulfateNo. 2 dry product: potassium sulfateNo. 3 dry product: potassium sulfateNo. 4 dry product: potassium sulfate
binder: waterbinding: 50% aqueous solution of liquid glass (1:1)binding: liquid glassbinding: 65% aqueous solution of liquid glass
The contents of fractions
%%%%
+6,022,663,71817,6
+4,021,431,22214,7
+3,023,82,7to 33.814,7
+2,022,61,3523,420,5
+1,00,41,317,6
+0,52,40,270,38,8
-0,51,20,40,15,9
Strength
kg/Gran.0,234,114,581,11
kg/cm23,258,1764,8315,7

The obtained pellets of potassium sulfate is subjected to drying to a residual moisture content mass fraction of not more than 1%. After spraying the binder and the formation of germ granules through a screw feeder serves a dry powder of potassium sulfate to ensure the continued growth of the granules.

Comparative tests of solubility of potassium sulfate and potassium chloride in water.

Tested the following product samples:

- Potassium chloride HUNDRED SPECS - 001-98 mark,

Mass fraction of potassium in terms of K2About 60.2 percent, dynamic strength - 93%.

Manufacturer of OJSC "Uralkali".

- A prototype of granulated potassium sulfate.

Mass fraction of potassium in terms of K2About 51.1 percent; the Content of impurities: Cl 0,4%; N, no; Na 0,24%; Mg+2no; CA+20,03%; insoluble the STATCOM 2,77%; dynamic strength is 94%.

Manufacturer LLC Soda-chlorate"

- Amelita.

Manufacturer JSC "Azot".

The methodology of the tests.

Equipment:

- mixer "Ecros 8100 with a two-bladed propeller stirrer (length of the blade 25 mm, height 10 mm);

- glass with an inner diameter of 55 mm, with a capacity of 250 cm3secondome.

For tests used the fraction of products with a particle size of 2-3 and 3-4 mm In a glass beaker with 100 cm3water under stirring with a frequency of 5 Rev/sec has introduced a portion of the test product in the amount of one gram and turned on the stopwatch. The end of the process of dissolution was determined visually by the disappearance of the particles of the solid phase at the bottom of the Cup (the movement of water-insoluble substances in the upper zone of the solution). The results are given in table 2.

td align="center" morerows="1"> Potassium sulfate
Table 2
SampleFractions, mmStatistical strength, kg/GranDynamic strength, %The number of dimensionsThe time of dissolution, min
Potassium chloride2-3-9350,9-1,1
3-441.1 to 1.2
2-34,589468-10
3-4611-15
Amelita2-31,2-30,3-0,4
3-430,4-0,5

The proposed method provides receiving granular potassium sulfate in the form of a crystalline non-caking and non-dusting product with a stable particle size and bulk weight, with a high content of the basic substance - K2On no less than 51%. The use of liquid potash glass as a binder provides not only high strength of the resulting pellets, but also allows to obtain a product with a high content of the target component To2Oh and by the absence of impurities. Obtained by the proposed method, the granules have a high measure of dynamic strength (94%) and durability.

Positive test results confirm the high strength of granules of potassium sulfate, obtained by the proposed method.

The soil application of granular potassium sulfate provides a prolonged effect of fertilizer due to slow dissolution of the granules, in addition, decreases with Epen ash product with stormwater runoff and wind.

The examples demonstrate the industrial applicability and the effectiveness of the proposed method.

Sources of information

1. Pechkovsky CENTURIES, Alexandrovich oil on canvas, and other Technology potash fertilizers, Minsk, High school 1968, p.28-29, 90, 225, 184.

1. Method for granulated potassium sulfate, comprising spraying a binder on a dry powder of potassium sulfate while stirring in a mixer-granulator, followed by drying the obtained granules to a residual moisture content of not more than 1%, characterized in that the binder component used liquid potash glass or 50 wt.% aqueous solution per 100 g of potassium sulfate not less than 8 g of the binder.

2. The method according to claim 1, characterized in that after spraying a binder through a screw feeder serves dry potassium sulfate for growth granules.



 

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