CS199801B1 - Continuous method of preparing stable suspension fertilisers and device for making the method - Google Patents

Description

SUMMARY OF THE INVENTION The present invention provides a continuous process for the preparation of stable suspension fertilizers containing potassium by homogenizing a liquid component with a solid powdered potassium salt using aqueous drying of a gel forming hydrophilic silicate in sodium or potassium form as a stabilizer and apparatus.

Although the handling and application of suspension fertilizers is characterized by rotating features and in comparison with solution liquid fertilizers and their use, there are some disadvantages, the need for production and use in a complex liquid fertilizer utilization system results from the requirement of potassium nutrition.

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Suspension fertilizers allow the production of liquid β fertilizers with a significantly higher content of nutrients than can be achieved with fertilizer solutions. This is particularly pronounced if the liquid fertilizer contains potassium. Comparative concentrations of nutrients in solution and suspension fertilizers containing potassium are possible, for example, on the basis of the data given in Table e. First

199 801

199 801 Table no. 1

Mass ratio of basic pure nutrients in liquid fertilizer N «P ₂ 0 ₅ » KgO Fertilizer fertilizers Suspension fertilizers % of compounds NP ₂ 0 ₅ - KgO total nutrient content in% % composition ^N ” ^P 2 ° 5 ^K 2 ° total nutrient content in% 0.33 »1« 1 3-9-9 21 7-21-21 49 0.33 »1« 2 2-6-12 20 5-15-30 50 1 1 1 r 1 8-8-8 24 15-15-15 45 0.5 <1 t 1 5-10-10 25 10-20-20 50 2 «I» 1 10-5-5 20 20-10-10 40

There is a wide variety of known and well-known literature dealing with the production, handling and application of fertilizers and fertilizers. For example, ACHORN F.R. (TVA) - FERtilizer Solutions, Jan.-Feb., Pp. 72-85,

1976

SLACK A.V. (TVA) - Fertllizer Developments and Trend 1968, DNB-London

SLACK Α · V., ACHORN F.P. (TVA) - Sun * Developments in Jlanufaoture and

Use of Liquid Fertilizers, Paper presented at The Fertlliser Society, London, 15 · 2 · 1973

SLACK A.V. VALTERS H.K. - Agrio.Chemieais, 17 (11), 56-58, 159-160 (1962) · At present the production of most types of suspension fertilizers 3-10-30, 5-15-50, 7-21-21 and 15- · 15-15

The vast majority of fertilizer and slurry production uses hydrophilic aluminosilicate silicate silicate lime minerals of the attapulglt, moatmorillonite, bentonite type to achieve the desired stability and readily suitable rheological properties. These are lla minerals and groups of glaserites formed by the gradual transformation of volcanic rocks (basalt, tuff, tuffite, etc.) with weathering geological conditions weathered.

Their stabilizing function in suspensions is usually explained by the fact that the swollen and activated particles (gel-forming filler) fill the space between the particles of the solids and thus prevent their sedimentary clay mineral used to stabilize the suspending fertilizers can be used in chemically untreated form or as the appropriate aluminum-sodium silicate ·

Generally, aluminum-alkaline silicates exhibit a higher stabilizing effect, in particular aluminum-eodué ·

Also brushing the water swollen water-saturated hydrophilic

In addition to its stabilizing effects on suspensions, the results of the stabilization of the suspensions achieve significantly better results than those of the addition in powder form, preventing their widespread use in the production of inorganic fertilizers, that such treated clays have consistency of semi-liquid pastes which makes handling difficult. theological procedure, increases the demands on machinery-theological equipment for the natrification, transport and dosing of this hydrophilic ile and also causes a continuous management of the technological process of suspension fertilizer production in most of the already realized production methods.

It has been found that the preparation of stable potassium-containing suspension fertilizers by homogenizing the liquid component or multiple components with a solid powdered potassium salt and the stability of the suspension fertilizer by increasing the hydrophilic gel-forming silicate in sodium or potassium form in the swollen state can be carried out in continuous gel forming silicate, or, during the preparation of its sodium or potassium form, add as fluidity enhancing additives, affect nucleation and crystal growth of technical grade lignosulfonic acid derivatives in an amount of 0.1 to 25% dry matter, and the actual preparation of stable suspension fertilizers is carried out in of ammonium and / or potassium phosphate solution · It is preferable to use lignosulfonic acid derivatives of technical purity which are freed from alcoholic fermentation by yeast Torula utllis, partially dosulfono and oxidized with oxygen, air and / or other oxidants, optionally obtained by impregnation of Ca (OH) ₂ at a temperature of 30 to 150 ° 0.

It has been experimentally confirmed that the already specified derivatives are active in the form of lignosulfonic acid as well as in the form of its calcium, sodium, potassium or ammonium salt.

Depending on the concentration of the aqueous suspension of hydrophilic gel-forming ile (dry matter content), the type of suspension fertilizer to be prepared, the required degree of fluidity of the suspension and fertilizer, and the storage requirements, it is appropriate that the dry matter concentration of the additive

It has also been made gold that it is particularly advantageous if the liquid component is homogenized with a solid powdered potassium salt and an aqueous suspension of a gel-forming ile (bentonite, attapulgite, etc.) in a Naale or K-form containing an already specified additive. with a slight excess of any of its constituents. From the foregoing, the advantageous preparation of the suspension fertilizer according to the invention in a continuous - continuous manner is of great importance, particularly in the case of large-scale industrial suspensions characterized by long shelf life. is shown in the flow technology diagram Fig. 1 ·

The continuous fertilizer suspension preparation according to the invention can advantageously be carried out on a device consisting of containers of the used liquid component 15, an additive container 12 of an aqueous solution of a solution or a calibrating agent 11 and a storage container of product g1, process and homogeneous products.

199 801 of the intermediate feeders of additive X2 used, aqueous solution of the pressurizing or calibrating agent 2 and the mineral suspension fertilizer £, further from the weight of potassium salt g, snail feeders of hydrophilic silicate 2 and potassium salt 2, dosing pump * water meters 2, cone filters of product 22 ^and Serpadiel 12, X2, lithium, 13, 12 and SZt wherein continuous homogenization is provided by the flow mixer X and / or the flow mixer 2 '

It has also been experimentally found that a continuous girder mixer provided with at least one vertically mounted mechanical mixer may be used as a continuously operating mixer 1 and / or 2.

It has proven to be particularly advantageous if each of the continuously agitated gill mixers is provided with three vertical agitators.

The interconnection and function of the mixers is evident from the dynamic dynamic functional description of the device according to the invention.

A technological defect is fed to the continuously operating through-flow trough mixer X via a flow meter 2 by means of a slipper dispenser 2, unmodified bentonite powder and on the opposite side (to the last stirrer) from the storage tank X2 by pump 1§ via steam pump X2. in the required amount of additives (fluid, protective colloid) · The water-swollen bentonite containing the additive falls in the form of an aqueous suspension into the blender of the feeder 2, where an aqueous solution of a pressurizing agent prepared in boiler 2 and pumped by pump 2 is added. operating storage tank χχ with dosing pump X2 ·

An aqueous suspension of gel-forming II in the Na- or K- form from mixer 2 ^{and is} continuously added to the suspension of potassium salt in a liquid component - saturated aqueous solution in a continuously flowing gland mixer 2 to which and the liquid component (usually NF-solution) used from the tank Xg by the dosing pump Xg · It is also advantageous if 1 part of the already prepared suspension is added to mixer 2 (marked in dashed line on the mixer). from where the pump X2 is conveyed via a cone filter 22 (a cone filter 20 served on the guard of mechanical impurities greater than 1 mm in diameter) into a 2X pneumatic mixing product storage container.

The following examples illustrate but do not limit the invention in any way.

Example 1

A continuous flowing gill mixer equipped with three vertically mounted turbine agitators e provided an average of 441.15 continuous hours on average.

199,801 kg of NB-base solution characterized by the following chemical composition:

- total nitrogen content »10.5% N

- total PgO content ≥ 35.3% ^ 5

- Co-conversion of PgO ^ ^to polycondensated forms »55.3% ·

Also 512.2 kg / hr of a natrified aqueous bentonite suspension prepared to the aqueous bentonite suspension was continuously fed into the mixer! containing 33,45 kg of powdered bentonite »

- content & 2θ3 * 1θ »5%

- AlgO ^ t content 16,2%

- POgO ^ t content 2,3% ·

- CaO content »4.6% in MgO content» 2.7%

- Loss on ignition: 9.6%

- a moisture content (determined by drying at 105 ° C> 6.2% and 192.8 kg of water (including bentonite-loaded water)) was added on the opposite side of the agitator (to the last mixer) 60.0 kg / h of about 50% In the aqueous bentonite suspension containing the additive, a 6.1% aqueous solution of NagCOyir was added at a rate of 25.95 kg / hr. The addition of an additive of the above-mentioned type achieved that: bentonite suspeozia after having been treated with an aqueous soda solution retained the desired degree of fluidity, allowing it to flow through the thiological equipment and to periodically feed the bentoaite suspension into the homogenizer-dispersible gully flow mixer to prepare a suspension fertilizer.

To this mixer was also fed continuously using a belt weigher, 75 kg / hr of ground technical potassium chloride containing 60.3% K 2 O (the ground potassium salt used practically did not contain particles larger than 400 µm, with an approximately 60 µm particle size corresponding to about 75 µm). %) ·

The homogeneous suspension prepared in this manner was concentrated in a homogenizing tank equipped with a stirrer, into which it continuously flowed from the trough mixer and through the overflow formed by the septum.

Suspension fertilizer is prepared from the hopper, specified as follows

- a total nitrogen content of 3,0% N

- total phosphorus content: 10,4% ^ 2θ5

- total potassium content »3θ, 1% KgO pump oez conical sequins to the suspension storage tank. After removing any mechanical impurities by filtration at a rate of 3.35 kg / hr ** ¹ , an average of 1,500 kg was obtained per hour, i.e. about 1 m &lt; 3 &gt;

198 801

Example 2

To a girder-type mixer equipped with three vertically-mounted saw-type mills and a continuous hour feed, 355.0 kg of teohnic water having an average temperature of about 45 °, 300.0 kg of water-borne bentonite containing added additive and 655.0 additive were added. potassium chloride containing 60, 3% KgO ·

The aupenzla of the bentonite pumped was prepared by continuously mixing the ingredients in the morning amounts and in the order:

194 kg of technical water kg of nonatrified bentonite powder (water content of about 10%) kg of yeast sugar of lignin-sulfonic acid, sugar-free from yeast

Torula utilis, containing about 50% dry matter, 40 kg of about 5 only aqueous sodium carbonate solution.

The potassium containing the suspension flowing from the continuously flowing or overflow mixer contained 30.1% KgO and was characterized by good rheological properties! (viscosity below 1000 oP, sedimentation volume after 7 days storage above 95% volume)

Claims (2)

1 · Continuous process for the preparation of stable suspension fertilizers containing potassium, homogenizing the liquid component and solid powdered drastic solo, using aqueous suspension of a gel-forming hydrophilic silicate in sodium or potassium form and in a water-swellable state as a stabilizer, characterized in that or during the preparation of its sodium or potassium form, add fluidity enhancing additives, affecting nucleation and crystal growth, teignic purity lignosulfonic acid derivatives in an amount of 0.1 to 25% dry matter, and the actual preparation of stable suspension fertilizers is carried out in a concentrated aqueous ammonium phosphate solution; / or potassium · 2. Equipment for the transfer of the method referred to in point 1; Consisting of reservoirs of the liquid component of the aqueous solution of the additive or calcolating agent, of the final product stock, operational and homogenizing intermediate reservoirs of the additive of the aqueous solution of the prefilter or calcolating agent, and of the flea product; liquid component pumps, elimination mixer-feeders, water meters, skin filter products and pumps, characterized in that it further comprises a flow mixer (1) for the preparation of an aqueous euepeaile gel-forming hydrophilic silicate and / or for its own preparation of stable auapensive fertilizers and / or flow mixer (2) for the preparation of aqueous auspenaie gel-forming iltt and / or for the self-preparation of stable auapensive fertilizers ·