SU859339A1 - Method of producing granulated urea - Google Patents

Description

(54) METHOD FOR OBTAINING GRANULATION

I

The invention relates to mineral fertilizers and can be used to obtain granulated urea with improved physicochemical properties.

There are known methods for improving granular urea properties by introducing into the plan small amounts of various additives, including representatives of the class of polysaccharides (for example, gluten in the form of an aqueous solution of bone or medullary adhesive with a concentration of 25-4%) lj |.

However, these methods did not find any practical application because of their low effectiveness and the lack of input additives.

There is also known a method for producing hardened urea granules by mixing urea with 0.06-0.40 wt.% Sodium carboxymethyl cellulose (Na-CMC), melting the mixture and passing the melt through special devices.

The disadvantages of this method are the high cost and deficiency of Na-KMlI, the incomplete solubility of the additive in the urea melt, and the low efficiency.

The goal of izofeteny is to increase the strength of the tr & urea, reducing plant growth. the finished product and the expansion of the range of additives that improve the phasic-chemical and agrochemical

fertilizers.

This chain is achieved by the fact that in a known method in a melt: urine with a concentration of 99.6% immediately before granulation, dried

15 T (cured black sea algae (algal flour) (Csstoseir a bortxa-fcci) in the amount of O, O1O, 20 wt.% From the weight of urea.

As a result, salt grains are obtained with better strength and lower solubility in water. The strength of the granules is increased in 1.5-2, O. raze, solubility (liquefied by 10-12%.

PRI m e p. Dried and tilted (0.10 mm) algae in Coptichesia 0.01-0.20 wt.% Are introduced into the urea melt with a concentration of 99.6% immediately before granulation. After stirring for 1-2 minutes, the urea melt is fed to the granulation.

The table shows the results of testing briquettes, urea for strength and

piacTinvisibility depending on the consumption of algae.

The Black Sea perennial alga (bdVbata) with alginic acid content up to 40% was used for the tests. The composition of Vedas, plants also includes plant mineral elements (boron, manganese, copper, iodine).

. As can be seen from the table in Tables, the strength of urea granules containing algae additives increases 1.5-2.0 times, and the solubility decreases to 12%. Compared with the known additive (sodium carboxymethylcellulose), algae are more effective additive.

The implementation of the proposed method has improved the physicochemical and agrochemical properties of urea, as well as the use of large tonnage marine resources that are not widespread at the present time.

Claims (2)

Claims. The method of obtaining granulated MOvii chevina by adding additives to its melt polysaccharides, characterized in that, in order to improve strength and reduce the granulate solubility and enrich the microelement fertilizer1, and use the Black Sea algae (Cye-to 5eirot bairbcs-ta.), which are introduced in OW-O powder, in the amount of OW-1, as polysaccharides. 0.50 wt.% By weight of urea. Sources of information taken into account in the examination 1, USSR Author's Certificate No. 571466, cl. C O5 C 9/00, 1977. 2.Patypr Velikofitanni number 1347548 Cl. C 1 B, 1974 (prototype).