Method for the production of granular fertilizers from fine powdered materials

 

(57) Abstract:

Usage: fertilizer, chemical, construction and other industries. Essence: granulation fine powder materials balling in disc or drum pelletizer are using as the liquid phase of the aqueous extract soluble components from the same fertilizer. The temperature of the aqueous extract is 80-90oC. the Method allows to obtain granules of fertilizer with a high content of useful components in the finished product. table 1.

The present invention relates to the technique of granulation of fine powders and can be used in fertilizer, chemical, construction and other industries.

In the prior art known to use as a liquid phase by granulation of dry powders by balling sulfite-alcohol stillage (kN. C. M. Ravich. "Briquetting in ferrous and non-ferrous metallurgy". M. metallurgy, 1975, S. 34-37). However, in the final products-fertilizers are applied contained in this Barda large quantities of sulfur, which is an undesirable component in the manufacture, nahlasovani and the firing of cement clinker raw cement slurry (ed.mon. USSR N 1537658 04 In 7/44 from 30.03.88 year).

The disadvantage of this method is the impossibility of filing of this sludge moisture content to 40% in mist form to obtain granules with a size of 1-4 mm, required for fertilizers, as well as the fact that the finished product is not enriched with useful components.

Closest to the proposed invention is a method of granulating sulphate of potash (ed. mon. USSR N 1068155 class. In O1 J 2/28: 05 D1/04 from 15.10.82 g), which is used as a binder a mixture of potassium sulfate and sodium silicate in a ratio of from 1-1 to 1-50, and the binder is applied in the form of 10-30% solution of salts, and the content of sodium silicate is 0.5 to 1.3% by weight of the finished product. The disadvantages of the prototype is the introduction of binder hardening additive component of sodium silicate, which is the ballast, from the point of view of nutrients in fertilizers, as well as the granulation of fertilizers in the fluidized bed, demanding, judging by the description of the invention, the particle size is not less than 0.1 mm, the Known method cannot be carried out for the granulation of fine powders, for example, cement dust, particles of which at 60-75% of a particle size less than 0,005 mm

oC.

This technical result is achieved by using a combination of essential features that characterize the proposed method for the production of granular fertilizers from fine powder materials.

The essence of the invention consists in that in the method of production of granular fertilizers, including granulation with input binder additives, added and changed the following: dosing of finely powdered materials, mixing, wetting and granulating by washing with or without additives them in a drum or disc granulator, and as the liquid phase when the granulation is used for water extraction of soluble components from the same fertilizer having a temperature of 80-90oC. it is possible granulating very fine powdery materials with micron Krupnov these same fertilizers, increases the nutrient content in the finished product and increases the durability of the pellets during crystallization added salts in them. The use of a hot solution (aqueous extract) allows to increase the solubility of nutrients and increase their inclusion in the finished product, thus improving its quality. The proposed method also allows you to enter in the granulated fertilizer with any necessary additives to improve its quality and scope.

Example. Potash-lime powder fertilizer particle size 96-98%

0,040 mm has the following chemical composition major components, wt. K2O 48,37; Na2O 2,15; SiO2are 5.36; Al2O30,79; Fe2O30,42; CaO 25,47; MgO - 0,29; SO315,98.

This fertilizer is dissolved in water at a temperature of 95-100oC in the ratio of W:T=3:1, then water is taken from it hood density 15-18 g/100 g of the solution with a temperature of 80-90oC. Dissolved in water the main components have the following chemical composition, wt. K20,87, 29; Na2O 2,8; CaO 0,81; Al2O30,1.

Dry powdered potash-lime fertilizer was desirables, moisturizing specified aqueous extract to wlasnosci,1 m There also water-to-air nozzle was supplied to the liquid phase in an amount necessary to obtain granules of a particle size of 1-4 mm For these fertilizers optimal moisture when washing these granules is 161% of the liquid phase used a water extract solution of potash-lime fertilizers (WCIU), water, sulfite-alcohol bard (PRS) and a mixture of potassium sulfate with sodium silicate of the prototype. Comparative data of the experiments are shown in the table.

The analysis shown in the table of results shows that using as the liquid phase of the aqueous extract solution of fertilizer in pellet by washing provides the most durable granules of uniform composition with a maximum content of useful components (in this case, K2O and CaO).

Method for the production of granular fertilizers from fine powdered materials, including batching, mixing, wetting and granulating by washing with or without additives, characterized in that the granulation by balling are using as the liquid phase of the aqueous extract soluble components from the same fertilizer having a temperature of 80 90oC.

 

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The invention relates to the technique of granulation fine powdered materials

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1 tbl

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8 ex, 1 tbl

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4 ex

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9 cl, 5 dwg, 1 tbl, 3 ex

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