SU802248A1 - Method of producing granulated fertilizer - Google Patents

Description

 The invention of ognosigs for the production of mineral fertilizers and the production of granulated fertilizers is known. A method of obtaining granulated mineral fertilizers is known by spraying pulp into the pseudo-pellese layer CL. The closest to the invention according to the technical essence and the achieved result is the method of obtaining granulated fertilizers by spraying a melt on the surface of the fluidized bed and returning to the layer of recirculating dry product 2}. The disadvantage of the known method is the formation of a fine fraction and the need to repeatedly return the fine product separated from the drying agent to the layer, i.e. the dusting increases. The aim of the invention is to reduce dust loss. The goal is achieved by the described method of obtaining granulated fertilizers by spraying melt onto the surface of the fluidized bed and returning to the layer of circulating I dry product, in which 5O-9O% melt is sprayed onto the layer surface and the rest is introduced into the fluidized bed. Example 1. In an apparatus on top of the fluidized bed sprayed 205 kg / h of pulp ammophos humidity of 45%. 2O5 kg / hr of pulp is also sprayed inside the fluidized bed, and a fine fraction of ammophos is introduced into the spray plume. Due to the drying of the flue gases, 225 kg / h of ammophos with a humidity of 1% is obtained. Dust removal from the layer is absent. Example 2. In the apparatus from above, 370 kg / h of ammophos pulp is sprayed onto the top of the fluidized bed with moisture.

45%. A pulp of 40 kg / hr of pulp is injected into the fluidized bed, and a fine fraction of ammophos is introduced into the spray plume. Ie apparatus unload 225 kg / hour. ammophos granules with a moisture content of 0.6%. The jieBbffloc layer from the layer is 2 O% of the amount of recycling introduced.

When the liquid material is supplied to the layer in the kholichestvo less than 10%, there is insufficient recycle and there is no decrease in the dustiness compared to the actual methods.

Example 3. In the device with pseudo

ozhizhennshng layer on top of the mirror layer jBbicoKOTeMnepaTypHHM tesh1 media

700 C are disintegrated - pulp of ammophos with humidity of 45% in the amount of 31 O kg / hour. The fluidization is carried out with a mouth of blowing of the drying agent with temperature. In the fluidized bed

Spread 100 kg / h of ammophos pulp, and a fine fraction of ammophos, separated from the drying agent, is introduced into the spray torch.

The specified mode ensures continuous operation of the device with a dry granulated ammophos productivity of 225 kg / h. At the same time, the dust removal directly from the layer constitutes 0.5-1.0% of the amount of the reiclel introduced into it. When using the well-known method for producing grouted fertilizers, the dusting up was 30-35%. As can be seen from the table and the examples above, when applying more than 90% of liquid to the surface, a decrease in pipéunos is not observed, and when applying less than 10% liquid to the surface of the layer, the productivity of the device decreases.

Table

The performance of the device 225

225

225

table 2

225

22;

205

155 The ratio of the flow of the pulp, %% (with separate introduction into the fluidized bed. Recycle and pulp)

Claims (2)

1. USSR author's certificate N6 151300В 010 2 / О4, published. 10/11/1961. 2. USSR author's certificate No. 202970, cl. From 05 D 19/00, published .. 05/10/1962 (prototype).