SU1353767A1 - Method of obtaining slow=acting fertilizers - Google Patents

Abstract

The invention relates to the production of slow-acting fertilizers with a silicate coating and can be used in the cultivation of grain crops. The purpose of the invention is to reduce the dissolution rate and increase the strength of granular fertilizers. This goal is achieved by the fact that by a known method, which includes the treatment of granules with a solution of sodium silicate, they are additionally treated with a solution of calcium chloride at a mass ratio of salts 1: 1-1: 1.1. The treatment is carried out in a fluidized bed with a 20% solution of sodium silicate and a 33% solution of calcium chloride at 30-40 ° C. The encapsulated granules are kept at 60i5 ° C. The method allows to reduce the rate of dissolution of fertilizers 1.1-1.2 times and to increase the strength of the granules 1.2-1.4 times. When using urea encapsulated by the proposed method, an increase in the yield of wheat and barley 5-12% is obtained. 1 tab. oh @ (l w eaten sb 05 vj

Description

 13537672

The invention relates to the production of a coating of less than 2.5% by weight of the effect of slow-moving fertilizers from silicate, with more than 6.0% by weight

decreases the nutritional value of fertilizers. Drying the pellets at a temperature

and can be used in the cultivation of grain crops.

The purpose of the invention is to reduce the rate of dissolution and increase the strength of granular fertilizers.

less than 30 ° C reduces the capacity of the granulation plant, increasing the temperature above AO C leads to deterioration of the performance properties of the sequential spraying of granules of granular fertilizer, solutions of sodium silicate and chlorine. .

Example. A weighed portion of urea granules in an amount of 1 kg is successively treated in a fluidized bed with an aerosol solution of 20% m sodium silicate solution and 33% calcium chloride 2o solution at 30–40 ° С at a rate of

 0.026 kg CaCl. 0.024 kg.

The encapsulated granules are dried.

at 60 ± 5 ° C. Similarly treated

granules of ammophos, ammonium nitrate,

nitrofoski.

The test results of encapsulated fertilizers are presented in the table. From the presented data it is clear

what the proposed method is compared

with the known, it allows the rate of fertilizer dissolution to be reduced by 1.1-1, 2 times and increases the strength of the granules.

1.2-1.4 times.

When a non-stoichiometric ratio of the strength of the granules, their additions

Research Institute of Silicate Coating Components

unprotected salts remain on the surface of the granules, which reduces the effectiveness of the coating. The optimum amount of encapsulating coating Q is 2.5-6.0 wt.%. When applying the silicate obtained by the proposed method in a field experiment conducted in 1982 on leached chernozem with

15 . with wheat of the variety Rang, it was possible to obtain an increase in grain of 5.0% at a wheat harvest of 32 c / ha, and in 1983 at 12.00% at a wheat crop of 26 c / ha. The use of encapsulated urea in the vegetation experiment with barley Atlas variety on poorly cultivated sod-podzolic soil reduced nitrogen losses from 31% to 26% and increased the utilization rate

25 nitrogen from 49 to 55%, yield increase was 12%.

thirty

Claims (1)

Invention Formula The method of obtaining slow-acting fertilizers by treating the granules with a solution of sodium silicate, characterized in that, in order to reduce the dissolution rate, they are treated with a solution of calcium chloride at a stoichiometric ratio of the components to form a coating in an amount of 2.5-6.0% of the mass of fertilizer at 30-40 ° C. 20 15 50.0 65.2 less than 30 ° C reduces the capacity of the granulation plant, increasing the temperature above AO C leads to deterioration of the performance properties of granular fertilizer, Testing of encapsulated urea obtained by the proposed method in a field experiment conducted in 1982 on leached chernozem with with wheat of the variety Rang, it was possible to obtain an increase in grain of 5.0% at a wheat harvest of 32 c / ha, and in 1983 at 12.00% at a wheat crop of 26 c / ha. The use of encapsulated urea in the vegetation experiment with barley Atlas variety on poorly cultivated sod-podzolic soil reduced nitrogen losses from 31% to 26% and increased the utilization rate nitrogen from 49 to 55%, yield increase was 12%. Invention Formula The method of obtaining slow-acting fertilizers by treating the granules with a solution of sodium silicate, characterized in that, in order to reduce the dissolution rate, and It is treated with a solution of calcium chloride at a stoichiometric ratio of the components to form a coating in the amount of 2.5-6.0% by weight of the fertilizer, the treatment is carried out at 30-40 ° C. 20.0 23.2 55.2 48.0 16.7 21.7 20 10 50.0 51.14 Compiled by B. Vaganov Editor N. Rogulich Tehred A. Kravchuk Proofreader L. Pilipenko Order 5666/22 Edition 408 Subscription VNIIPI USSR State Committee cd inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4 Continued. 48,212,570,1 Not covered by 12.3 11.1 17.0