Method of producing granular potassium chloride

FIELD: chemistry.

SUBSTANCE: invention can be used in chemical industry. The method of producing granular potassium chloride involves structural agglomeration of filtered potassium chloride in a turbo blade mixer-granulator, drying and pressing the agglomerated product, grinding the pressed product and sizing the ground product. Structural agglomeration of the potassium chloride is carried out together with fine sizes of the granulation stream obtained after sizing the ground pressed product with the load on the turbo blade mixer-granulator not less than 400 t/m2 of its cross section. The agglomeration process is not shorter than 15 seconds.

EFFECT: invention enables to obtain granular potassium chloride with improved rheological properties such as static strength and wearing capacity of granules, not contaminated with structure-forming additives.

2 tbl, 2 ex

 

The invention relates to techniques for granulated potassium chloride, obtained, for example, by dissolving sylvinite ores, the crystallization of potassium chloride from clarified saturated solution, its selection and drying with subsequent granulation.

Widely known methods of granulation of potassium chloride, including drying, pressing rollers, grinding of pressata and classification of grinding to obtain the desired product - see Muradov G.S., Somin I.P. Receipt of granular compaction method. M.: Chemistry, 1985.

A disadvantage of known methods is the tendency to the destruction of the granules of potassium chloride in the process of storage and transportation.

To improve the physical-mechanical properties of the granulate proposed fine-grained processing of the raw product before pressing different binder additives: resin - A.S. the USSR №833293, CL B01J 2/28, 1981; mixture of sulfate yeast brew and urea as the USSR №1096265, CL 05D 1/02, 07.06.84, bull. No. 21; oil processing products - A.S. the USSR №1110774, CL 05D 1/02, 30.08.84, bull. No. 32, etc.

The granules obtained by known methods, pollute extraneous substances. In addition, in the case of granulating galilejskogo potassium chloride does not exclude the probability of failure of the granules during storage and transportation, the ligature is necessary operation additional classifications of product prior to shipment with return of fines to re-granulation of the product.

A method of obtaining potassium chloride moisture with improved rheological properties by pressing concentrate potassium chloride galilejskogo or flotation of sylvinite ores with added mineral substances selected from a carbonate, sulfate, dihydrofolate, orthophosphate, metasilicate potassium or sodium, which are served before drying in the wet concentrate on structural stage agglomeration and structural agglomeration is carried out at a moisture content of 3.0% to 5.0% in TurboPascal mixer-granulator by plastic deformation of the wet concentrate is mixed with hot dry potassium chloride - see RF patent №2359910, CL C01D 3/22, 27.06.09 - prototype.

The disadvantage of this method is the contamination of the target product structure-forming impurities. The method does not exclude the destruction of the granules during storage and transportation in the case of granulation galilejskogo potassium chloride.

Object of the present invention to provide a granulated potassium chloride with improved rheological properties that are not contaminated structure-forming additives.

This goal is achieved by the fact that in contrast to the known method, including structural agglomeration filtered potassium chloride in TurboPascal mixer-granulator, suck and compressing the agglomerated product, the grinding of pressata and classification of grinding, the proposed method structural agglomeration filtered potassium chloride are together with small classes of particle flow granulation obtained after classification of grinding of pressata when the load on TurboPascal mixer-granulator at least 400 t/m2its cross-section with a duration of agglomeration for at least 15 seconds.

The essence of the method as a technical solution is as follows.

In contrast to the known method of structural agglomeration filtered potassium chloride are together with small classes of particle flow granulation obtained after classification of grinding of pressata.

At existing potash companies target fraction of the particles are, as a rule, potassium chloride pellets with a size of 2-3 mm Fraction of particles +3 mm) is fed to regrind together with pressato, and fraction - 2 mm is returned to the compression in conjunction with potassium chloride coming from the drying section.

Thus, the target product of the operation of granulation is potassium chloride fraction -3+2 mm. In consultation with consumers granular product can be considered a fraction -4+1 mm or another. However, at all granulation internal thread minor classes of particles, e.g. less than 1 mm, in suraweera to the compression.

Particles galilejskogo potassium chloride, obtained by vacuum crystallization of KCl solution when it is cooled, followed by drying of kristalliset, have an irregular shape, which differs significantly from the equilibrium - cubic. A similar form have crystals sylvite flotation concentrate and the fine particles of the internal thread of the granulation, the resulting extrusion, grinding and classification as galilejskogo and flotation of potassium chloride. Therefore, the surface energy of the particles is excessive, the system has a high sorption capacity and capable of agglomeration of crystals with particle formation with minimum surface energy. This water, which is present in the material entering the press, in an amount of 0.1 to 0.5%, plays the role of surfactants in the process of formation of the phase contacts. Without prior structural agglomeration of the material coming into pressing, fermentation in the finished granulate, resulting in the process of storage and transportation breaks down to 20% of the target product.

In the proposed method, the effect of structural agglomeration of the material supplied to the compression achieved through structural agglomeration wet filtered potassium chloride in conjunction with heated is when pressing small classes of particles stream granulation, obtained after grinding of pressata in TurboPascal mixer-granulator, followed by drying of the material. When this happens compulsory packing of polydisperse material, mechanical leveling the surface of the filtered concentrate and particle flow granulation, the defects of crystals and particles due to their enveloping fine product, formed by abrasion of polydisperse particles. When the interaction of particles with sorption after filtration and residual after pressing, the water, the total content of which is 1.0 to 2.8%at the boundary of particle migration occurs saturated solution between the particles, which leads to even out the surface of the particles, reduces thermal and mechanical deformation of crystals. Experimental studies have shown that the load on TurboPascal mixer-granulator on the amount of flow of the filtered potassium chloride and small classes of particle flow granulation should be not less than 400 t/m2the cross-section of the mixer-granulator.

Reducing the load on the mixer-granulator is not possible to obtain optimal force packaging material before pressing, as the load increases, though, and gives a positive effect, but requires significant cost of transporting material in gr is nostore.

The duration of the sintering material should be not less than 15 seconds at a moisture content of 1.0 to 2.8%.

Reducing the duration does not allow you to complete the process of structural agglomeration and increase the duration leads to a significant increase in the size of the mixer-granulator, and hence the cost of manufacture and supply. So, for example, the default ratio of the diameter to the length turbolaser mixer granulator, equal to 0,06-0,1, with increasing duration of granulation 2 times, 2 times it is necessary to increase the length of the device or to install additional yet another device.

The agglomerated product was dried and granulated by extrusion method with the return of small classes of particle flow granulation of re-agglomeration together with the filtered potassium chloride.

The table shows the results of the influence of structural agglomeration, for example, galilejskogo potassium chloride on the rheological properties of the target product, depending on the parameters of the sintering process.

td align="center"> without entering additives
IndicesIndicators
The placeholderThe inventive method
with the introduction of additivesoption 1option 2option 3
1. Load TurboPascal mixer-granulator, t/m2. The processing time is 15 seconds--350400450
2. The duration of agglomeration, seconds, when the load on the mixer 400 t/m2152035
3. Static strength of granules, kg:
- at the time of receipt3,74,55,05,25,2
after 10 days of storage in stock1,13,7a 4.95,050
4. Abrasion of pellets, %:
- at the time of receipt8,17,04,64,34,0
after 10 days of storage in stock28,610,08,27,97,4

Similar results are obtained when using flotation concentrate of potassium chloride.

The data show that the proposed method is obtained granulated potassium chloride with improved rheological properties (static strength and friability of the granules), not contaminated structure-forming additives, and, thus, solves the task of the present invention.

The method is as follows.

The filtered potassium chloride was applied to TurboPascal mixer-granulator, which gave small classes of particle flow granulation obtained after extrusion of the material on the foam roller presses, RA the Mall of pressata and classification obtained after grinding particles.

Load TurboPascal mixer-granulator was not less than 400 t/m2and the duration of the agglomeration for at least 15 seconds.

The resulting agglomerate was filed on drying at temperatures above 100°C, and then pressing. In the process of pressing is also used rollers with a smooth surface, but the output of pressata decreases.

Examples of the method.

Example 1.

Filtered glogicheski potassium chloride with a temperature of 30°C and humidity of 4% in the amount of 120 t/h was applied in TurboPascal mixer-granulator with a diameter of 800 mm and length 5600 mm There gave small classes of particles stream granulation, with a moisture content of 0.5% and a temperature of 60°C, obtained after extrusion of the material on the roller presses, grinding of pressata and classification by class - 1 mm in the amount of 100 t/h Load on the mixer was 438 t/m2. The duration of agglomeration - 15 seconds. The resulting agglomerate was dried at 105°C and then applied for roller cellular press, after which Pressac crushed and classified to rumble with obtaining the target product class -4+1 mm, number 115, 8mm t/h and small fractions of class - 1 mm in the amount of 100 t/h Static strength of granules at the time of receipt was 5.2 kg, after a 10-day storage - 5.0 kg

Example 2

The method was implemented in soo is according to example 1, but on agglomeration filed filtered potassium chloride with a moisture content of 4.5% and small classes of particle flow granulation with a moisture content of 0.1%. Static strength of granules at the time of receipt was 5.3 kg, after a 10-day storage - 5.1 kg

Method for granulated potassium chloride, including structural agglomeration filtered potassium chloride in TurboPascal mixer-granulator, drying and compressing the agglomerated product, the grinding of pressata and classification of grinding, characterized in that the structural agglomeration of potassium chloride are together with small classes of particle flow granulation obtained after classification of grinding of pressata, when the load on TurboPascal mixer-granulator at least 400 t/m2its cross-section, with a duration of agglomeration at least 15 C.



 

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