SU1477727A1 - Fertilizer conditioning process - Google Patents

Abstract

The invention relates to the production of mineral fertilizers used in agriculture. The purpose of the invention is to reduce the concomitability of the finished product while reducing the amount of conditioning additives. Fertilizer pellets are pelleted for 4-10 minutes at a speed of 0.8-2.0 m / s at a temperature of 50-90 ° C, after which carbamide-formaldehyde compounds are sprayed onto the granules. The application of the invention allows to completely eliminate the caking of complex fertilizers during transportation and storage and to manufacture products of the highest quality. 1 tab.

Description

The invention relates to the production of mineral fertilizers used in agriculture.

The purpose of the invention is to reduce the traceability of the finished product while reducing the consumption of carbon-formaldehyde compounds (CFS).

The method is carried out as follows.

100 g of Nitrophoska brand 11:10:11, heated to 70 ° C, are placed in a rotating drum at a speed of 2.0 m / s, where the surface is rolled over 7 minutes. 0.5 g CFS is sprayed onto the granules, the product is stirred for 10 minutes and its observability is determined. Nitrofoski caking is 0.

The experimental data, which makes it possible to substantiate the expedient parameters of the nitrophosphate conditioning method, are given in the table.

From the data given in the table, it follows that with J., less than 4 minutes, the time required for solidification of CFS exceeds the residence time of the granules in the conditioning apparatus. Therefore, caking fertilizer exceeds the permissible limit (20 kPa).

With a pelleting time of 4 to 10 minutes, 2 is significantly reduced, and the CFS film hardens under the conditions required by the process conditions. Under these conditions, each fertilizer granule is almost completely enclosed in a CFS film, as a result of which the fertilizer does not cake.

Nitrofoski’s caking is significant with increasing C, more than 10 minutes is caused by the disintegration of granules with long-term enveloping and an increase in their total surface, which requires

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increase in consumption of CFS. Consequently, an increase in the pelleting time over 10 minutes is impractical.

When the temperature of the fertilizer is below 50 ° C (Example 6, Table), caking after treatment remains high, and heating of fertilizers over 90 ° C is impractical due to unreasonable energy costs and loss of ammonium nitrogen at high temperatures.

When the speed of movement of the granules is less than 0.8 m / s, their mechanical action against each other is insufficient and the surface smoothing is insignificant. Therefore, the CFS film does not uniformly cover the surface of the granules, and the fertilizer caking increases.

When the speed of movement of the granules above 2 m / s, their structure is destroyed,

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which worsens the conditions of polycondensation CFS. The caking capacity of the fertilizer increases during this cycle.

Claims (1)

The application of the invention for the conditioning of complex fertilizers allows for the complete crumbling of fertilizers during transport and storage and to produce products of the highest quality category. Invention Formula A method of conditioning fertilizers, which includes the treatment of granules with urea-formaldehyde compounds (CFS), characterized in that, in order to reduce the quality of the finished product while reducing the consumption of CFS, the granules of fertilizer before processing CFS are doused at a relative movement speed of 0.8-2, 0 m / s for 4-10 min at 50-90 ° C.