Method for granulated potassium chloride

 

(57) Abstract:

The invention relates to the improvement of the physico-chemical properties of granulated potassium chloride. Method for granulated potassium chloride includes dusting his fluidized bed, wetting and drying of the granules of the product with subsequent conditioning of organic substances and cooling, with wetting and drying are simultaneously in a fluidized bed, using a suspension of potassium chloride in its saturated solution with W : T = 0.7 to 2.5, the drying is conducted at temperatures above 100oSince, in the presence of the product of alkaline earth metal chlorides advanced air conditioning are mineral substances that bind metal ions in nephroscopes products. The technical result consists in the improvement of physical-chemical properties of granulated potassium chloride. 2 C.p. f-crystals, 1 table.

The invention relates to techniques for improving the physico-chemical properties of granulated potassium chloride and can be used, for example, in the production of granular potash fertilizers by compaction of fine-grained salt, with subsequent grinding of the tiles and the classification of the product.

There is a method of piscivore granules with water or a saturated solution of salt on the conveyor with their subsequent drying (see U.S. patent N 3026194, CL 71-64, 20.03.62).

The disadvantage of this method is the presence of granules of micro-cracks, sharp edges and other defects, contributing to their destruction during transportation and storage.

There is a method of producing granulated potash fertilizer by compaction of fine-grained salt, two-stage crushing of pressata, classification, spray granules saturated solution of potassium chloride, dry processing in the rotary drum at 60 - 120oC, and then the anti-caking agent (see and.with. 787397, class C 05 D 1/02, C 01 D 3/04 from 05.09.78. Publ. 15.12.80. Bull. N 46). There is a method though and allows the grinding of the pellets, however, the existing defects on the surface of the particles covered with a loose porous layer during storage and transportation of the product does not protect the granules from destruction due to the hygroscopicity of the top layer of particles.

A method of obtaining non-dusting nesterowicz granular potash fertilizers (prototype - see and.with. 998450, class C 05 D 1/04, from 01.06.78, publ. 23.02.83. Bull. N 7) by removing dust fertilizer in fluidized bed wetting granular product at 40-80oC water in an amount of 0.5 to 2.0%, drying the granulated product is strong, as needed pogivaet dusting of granulated product in a fluidized bed with air speed of 1-4 m/s, as well as the conditioning of the product with organic substances, mainly oils.

There is a method allows the allocation of the target product pulverulent fraction to remove the sharp chips on the particles due to their wetting by water, rolling and heat treatment in a fluidized bed. However, wetting of the granules observed expansion of micro-cracks in the particles by dissolution in water of potassium chloride by heat treatment followed by filling them in drying porous crystalline mass.

During transportation and storage of granulated potassium chloride, obtained by a known method, its physico-chemical properties deteriorate due to moisture sorption porous surface. In addition, due to the lack of water used for processing of the granules of irregular shape formed in the processes of pressing, grinding and classification of salt, effective okutyvaya particles in the fluidized bed does not occur, resulting in a process of smoothing the surface of the particles due to friction forces continues with the transportation and dusting properties of the product increase, causing complaints of consumers.

The task of the invention is to improve physico-chemical properties of g which includes a dusting of fertilizer in the fluidized bed, wetting and drying the granulated product with its subsequent conditioning of organic substances and cooling, wetting and drying of the granules are simultaneously in a fluidized bed, using a suspension of potassium chloride in its saturated solution and in the presence of the product of alkaline earth metal chlorides additionally are conditioned granules of mineral substances.

Another difference is that for the wetting of the granules using a suspension of potassium chloride with W:T=0.7 to 2.5, the drying is conducted at temperatures above 100oC.

For the preparation of suspensions can be used for fine-grained potassium chloride: cyclone dust, fine potassium chloride, obtained by classification in primary production and other

As mineral substances in the conditioned granules of potassium chloride, having in its composition chlorides of alkaline earth metals, the proposed method add compounds (hydroxides or carbonates of alkali metals, alkaline additives, etc.,) that bind metal ions in nephroscopes products.

The essence of the method consists in the following. In contrast to the known method, where the operation bespylevoe. This solution allows you to align the surface of the particles due to friction in a dense fluidized bed, to capture dust suspension of potassium chloride, which is sprayed into the fluidized bed through a nozzle, dehydrated on the granules with the formation of a dense surface, and to remove from the system the newly formed small classes, causing flaking of the target product.

According to the method already wetting dedusted granules is carried out by water supplied in an amount up to 2%. This water is distributed over the surface, and grooves or scuffs comes into particles, dissolving part of potassium chloride with the formation of the saturated solution. The surface of the particles is practically not changed since the supplied water is not enough to smooth out irregularities due to their dissolution.

When drying a saturated solution boils with the formation of small crystals, not enough to kalatali internal and external defects granules, and cracks are filled with a porous dust generated due to akadi granules in a fluidized bed. During storage and transportation through the internal defects filled with hygroscopic dust and IU is ICIE from the known method according to the invention, the wetting of the granules is carried out in a fluidized bed at elevated temperature by sputtering in a layer of a suspension of potassium chloride in its saturated solution. Our experiments showed that when spraying the suspension on the inside layer through a pneumatic nozzle is dewatering the suspension on the surface of the granules as inert material. Due to the high content of potassium chloride in suspension (W:T=0,7-2,5) when dehydration occurs Calmette internal defects of the granules and the alignment of the outer surface up to the formation of particles almost spherical shape.

To reduce energy consumption it is desirable to apply the suspension with a higher solids content, however, when W:T < 0.7 fluidity of the suspension and its uniform distribution in the layer decreases. At high W:T, for example, more than 2.5, the uniform distribution is growing, granules covered by a dense layer, but the cost of the evaporation of water increase dramatically and increased pilipinos.

The experiments showed that for different designs of the fluidized bed apparatus (round or rectangular lattice), changing the parameters of the gas velocity (1-4 m/s) W: T suspension (0.7 to 2.5), and its consumption (1-8%), temperature (100-150oC) and the air pressure on the pneumatic nozzle (1-4 MPa), it is possible to obtain particles of the rounded shape of a given size, for example 2-3 mm

All of the examples used granulated potassium chloride, obtained by pressing flotation of potassium chloride with KCl content is 95.8%, H2O - 0,1%, followed by grinding tiles, the classification of the product and refund of the fraction is 1 mm by pressing.

The contents of fractions -3+1 mm - 95%.

In example 3 for air conditioning as minerals used soda content MgCl2in the original salt 0,32%.

For the preparation of a suspension of potassium chloride used is preferably fine-grained potassium chloride: cyclone dust undersize classes of granules, particles less than 0.2 mm from the separate flotation, etc. that allows you to receive fluid suspension, to use with limited marketing of substandard physical-mechanical properties of potassium chloride, as well as to get a smooth dense surface during the processing of the original granules suspension of potassium chloride in a fluidized bed apparatus by heat treatment.

The data show that almost all indicators processing of the granules of the proposed method is preferred, especially when the granules of the chlorides of alkaline earth metals such as magnesium chloride and / or feces is STI 80% of the moisture content in the granulated product after 3 days. increases from 0.1% to 0.43%.

In our proposed method in the presence of a granular product of these compounds in the slurry, potassium chloride, supplied in a fluidized bed, add mineral substances that bind metal ions in nephroscopes connection. As such minerals are encouraged to use hydroxides or carbonates of alkali metals, potassium or sodium silicate, alkaline supplements, etc., the consumption of which is defined by the equation

< / BR>
The consumption of alkaline reagents may be stoichiometric, so below, as on the surface of the granules formed layer nephroscopes material and to achieve complete binding of magnesium ions (calcium) is not necessary.

The method is as follows.

Granulated potassium chloride, obtained, for example, by pressing flotation of potassium chloride, grinding tiles, the classification of the product fractions with the return of large fractions for recrushing, and small - repeated pressing, served in a fluidized bed apparatus at a temperature in the layer 100-150oC and a gas velocity of 1-4 m/S. Upon reaching the resistance layer 300-500 mm of water.post fluidized bed is Yes granulated product. With the increase in flow rate of the suspension and reduction W:T leads to the formation of a smoother surface of the granules.

The pressure at the nozzles is maintained within the range of 1-4 MPa, depending on the requirements of the granulometric composition of the final product, so as to increase the degree of dispersion of the suspension decreases the overall size of the granules. The temperature and resistance of the layer in the device of the fluidized bed maintained at a specified level by a continuous supply of feedstock (granulated potassium chloride and suspensions), and upload the final product.

For the preparation of a suspension of potassium chloride used is preferably fine-grained potassium chloride: cyclone dust undersize classes of granules, particles less than 0.2 mm from the separate flotation, etc. that allows you to receive fluid suspension, use substandard physical-mechanical properties of potassium chloride, as well as to obtain a smooth surface in the processing of the granules in the fluidized bed apparatus.

In the presence of granulated potassium chloride supplied to the processing of the chlorides of the alkaline earth metals used for conditioning mineral substances that bind metal ions Od alkaline reagents may be stoichiometric, so below.

Examples of the method

Example 1.

Granulated potassium chloride content of KCl is 95.8%, H2O -0,1%, fraction 3+1 mm was applied to the fluidized bed apparatus at a speed of gases in the layer 2 m/S. Upon reaching the resistance of the layer 500 mm of water. Art. along with a granular product in a fluidized bed filed aqueous suspension of potassium chloride in the amount of 4% of the consumption of granulated potassium chloride.

At a temperature of 120oC the suspension was dehydrated on the surface of the granules and the final product was withdrawn from the fluidized bed apparatus. The product had an index of piomote 30 mg/kg the Product has kondicionirovanie standard organic substances: ethylene glycol and amine. The rate of piomote decreased to 9 mg/kg and small form factor 1, 2 and dynamic strength of granules 99%. After 3 days. storage at 80% humidity and verifying the durability of the pellets under a load of 8.7 megapascals dynamic strength was 15%.

Example 2.

The process was carried out in accordance with example 1, but the processing was applied granules with the content of MgCl2in them 0,32%.

For the conversion of magnesium chloride in nephroscopes connection response:

MgCl2+ Na2

Example 3.

The process was carried out in accordance with example 1, but for the preparation of potassium chloride used cyclone dust from the drying of potassium chloride, potassium chloride particles less than 0.2 mm from the separate flotation, screening granulate fraction less than 0.2 mm, the Suspension was prepared with W:T=0.7 to 2.5 and consumption, it was 1-8% of the flow of the original granules.

In all cases, the received dynamic strength of granules immediately after processing the source material in the fluidized bed apparatus over 99%.

1. Method for granulated potassium chloride, including dusting of fertilizer in fluidized bed wetting and drying of granulated product with its subsequent conditioning of organic substances and cooling, characterized in that the wetting and drying of the granules are simultaneously in a fluidized bed, using a suspension of potassium chloride in its saturated solution and in the presence of the product of alkaline earth metal chlorides additionally are conditioned granules of mineral substances.

2. The method according to p. 1 distinguishing the re above the 100oC.

3. The method according to p. 1, characterized in that when the conditioned granules of potassium chloride, having in its composition chlorides of alkaline earth metals, add as mineral substances compounds that bind metal ions in nephroscopes products.

 

Same patents:

The invention relates to methods of producing nitrogen-potash granular fertilizers based on urea and potassium chloride

The invention relates to methods of producing nitrogen-potash granular fertilizers

The invention relates to techniques for processing fine potassium chloride, resulting in the production of potash fertilizers from sylvinite ores

The invention relates to the production of non-dusting and crystalline non-caking of fertilizers and can be used at the enterprises producing potash fertilizers
The invention relates to the production of mineral fertilizers

The invention relates to the processing of potash ores, in particular the production of mineral fertilizers

The invention relates to the field of production of mineral fertilizers potassium chloride with a distinctive or characteristic of the color

The invention relates to the field of production of non-dusting of mineral fertilizers and can be used at the enterprises producing potash and other fertilizers

The invention relates to techniques for the production of mineral fertilizers, in particular to a technology for production of potassium sulfate from potassium chloride and ammonium sulfate in an aqueous environment by recycling excess solutions to complex NPK fertilizer

The invention relates to technologies for non-dusting of mineral fertilizers and can be used at the enterprises producing potash and other fertilizers

The invention relates to methods of granulation lithium salts

FIELD: chemical industry, agriculture, in particular hardness removal agent and saltlick for cattle.

SUBSTANCE: salt with pH 4-10 is pressed under 5000-2500 N/cm2. Salt contains NaCl, less than 0.1 wt.% of water, and iron-ammonium complex of polyhydroxycarboxylic acid in amount sufficient to obtain non-caking salt. As iron-ammonium complex of polyhydroxycarboxylic acid iron-ammonium citrate with molar ratio of iron to citrate-ion from 0.5 to 2 and molar ratio of ammonium to citrate-ion from 0.5 to 2 may be used. Finished product contains 0.1-20 mg/kg of iron and has form of briquettes, balls, bars, crushed plates, tablets, etc. Invention makes it possible to provide good formability under high pressure and conserve pressed product shape in moist medium for a long time.

EFFECT: products from salt non-caking at storage and conveyance.

11 cl, 6 tbl, 2 dwg, 7 ex

FIELD: materials for miscellaneous applications.

SUBSTANCE: grain mixture comprise, in mass %, 15-45% of compressed first salt of alkaline or alkaline-earth metal and 85-55% of the second salt of alkaline or alkaline-earth metal. The first salt is a waterless hygroscopic salt.

EFFECT: reduced cost.

14 cl, 4 dwg

FIELD: chemistry.

SUBSTANCE: invention refers to the method for preparation of moisture resistant potassium chloride with enhanced rheological properties. The method includes compression of the concentrated potassium chloride obtained by the halurgic or flotation concentration of the sylvinite ore with the additive of the mineral substance. The aforesaid mineral substance is structure-forming salt selected from the potassium or sodium carbonate, sulphate, dihydroorthophosphate, orthophosphate or metasilicate, it is fed to the wet concentrate in the stage of structural agglomeration before drying. The latter stage is carried out at moisture level 3.0 - 5.0% in turbo-bladed mixer-granulator by the way of plastic deformation of the wet concentrate mixed with dry hot potassium chloride. The structure-forming salt is fed in amounts of 0.5 - 5.0 kg/t of the ready product (dry or in the form of water solution). The dry hot potassium chloride is fed to the stage of plastic deformation in amounts of 10 - 20% in relation to the weight of the dry agglomerated potassium chloride.

EFFECT: method is versatile and allows to obtain the fine and compression granulated potassium chloride which is able without treatment with anti-clodding agent to retain its grain size composition and flowability at storage and handling in wet climate.

4 cl, 4 tbl, 1 ex

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

FIELD: chemistry.

SUBSTANCE: invention can be used in producing halurgic potassium chloride from sylvinite ore using a dissolution-crystallisation method. The method of producing potassium chloride involves structural agglomeration of a mixture of a wet crystallisate and dry hot potassium chloride in a mixer-granulator and then drying the mixture. For structural agglomeration of the mixture, dry hot potassium chloride is fed in amount of 25-100% of the weight of wet crystallisate. The mixture is dried at temperature 105-135C to obtain the end product.

EFFECT: invention reduces caking capacity of potassium chloride, avoids use of structure-forming salts, reduces consumption of reagents used to prevent potassium chloride from caking, and obtain a product which does not contain extraneous impurities.

2 cl, 2 tbl, 2 ex

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

FIELD: chemical industry and technology, fertilizers.

SUBSTANCE: method involves feeding ammonium nitrate melt into a mixer for mixing in the amount 33-69 wt.-%, potassium chloride in the amount 22-65 wt.-%, the special mineral additive - phosphogypsum in the amount 2-9 wt.-% and ammonia for maintaining pH value of the mixture in the range 6.5-7,5. Prepared pulp is sprayed to recycle in drum granulator, granulated at the recycle number = 1:(2-2.5) and product is dried. Stirring is carried out in optimal regimen at temperature 100-130°C for 20-30 min. Invention provides enhancing output due to acceleration of the conversion process in simultaneous enhancing fertilizer granules strength and reducing washing out from soil. Invention can be used in manufacturing granulated nitrogen-potassium mineral fertilizers.

EFFECT: improved preparing method of fertilizer.

2 cl, 1 tbl, 14 ex

FIELD: mineral fertilizers.

SUBSTANCE: invention relates to technology of manufacturing complex mineral fertilizers that can be used in processing of polyhalite raw materials. Polyhalite is decomposed with nitric acid, after which reaction mixture is neutralized with nitric acid and then with ammonia, filtered, and resulting precipitate is subjected to three-step countercurrent washing with water (returned into polyhalite decomposition stage) and filtrate is evaporated to produce fertilizer.

EFFECT: improved quality and yield of fertilizer, reduced amount of water to be evaporated.

1 tbl

FIELD: mineral fertilizers production.

SUBSTANCE: invention relates to methods for potassium-containing fertilizers from potassium production waste and consists in determining potassium content in brine when performing pumping excess brines of potassium production to burial place through brine conduit and, when this content is above 5 g/L, brine conduit between burying place and concentrating mill is shut off and brine is directed to sorption column packed with natural zeolite selectively isolating potassium from brines, brine leaving the column being periodically analyzed on potassium content. When zeolite is saturated with potassium ions it is pumped out of the column and replaced further with fresh portions of zeolite. Zeolite saturated with potassium from excess brines of potassium production finds use as prolonged-action mineral fertilizer or is subjected to desorption in concentrating mill.

EFFECT: increased amount of potassium transformed into mineral fertilizer from potassium deposit ores due to its recovery from excess brine of potassium production.

FIELD: production of nitrogen-potash granulated fertilizer based on carbamide and potassium chloride.

SUBSTANCE: claimed method includes mixing of carbamide, potassium chloride. Magnesium-containing component such as serpentinite or magnesium sulfate and granulation of obtained mixture, wherein magnesium-containing component is used in amount of 2-15,0 mass % based on carbamide content, and carbamide is used in form of solution in amount of 29.8-82.4 mass %.

EFFECT: effective nitrogen-potash fertilizer of improved physicochemical and agrochemical properties.

3 cl, 1 tbl

Up!