SU986478A1 - Method of producing granulated mineral fertilizers - Google Patents

Description

The invention relates to methods for producing mineral fertilizers in granular form and may find application in the chemical industry. A method of obtaining granulated mineral fertilizers is known, which includes mixing the starting fruit with its initial granulation and drying the granules in the presence of an ij supplement. In this method of introducing an air conditioning additive at the stage of drying the granules, the hardening of their surface layer, reduction of dustiness and abrasion of the granules is achieved. The closest to the pre-abused cnoco6iy is the method of obtaining granulated mineral fertilizers, including mixing the initial product with the binder and conditioning additive, granulating it and drying the granules. provides x more substantial hurt. The disadvantages of the known methods are that because to ensure a combination of high mechanical strength, low abrasion resistance and dust removal on top of the outer layer, it is necessary to introduce a significant amount of ad hoc additive, which in turn leads to a general summary. Squeeze in fertilizers of the main nutrient component. The aim of the invention is to reinforce the strength of the granules, reduce their abrasion and dust capacity without increasing the amount of the conditioning additive introduced. This is achieved by the fact that, in carrying out the method for producing granulated mineral fertilizers, including mixing the starting product with the additive and conditioner with the additive, granulating it and drying the granules,

drying the granules are treated with a conditioning additive.

Thus, keeping the total amount of the conditioning additive unchanged, it is introduced partly at the stage of mixing the starting product with the binder, partly at the stage of drying the granules. This ensures the most rational distribution of the conditioning additive both by volume and over the surface of the granules.

. Example. Dusty potassium chloride with the main component content of 94% is moistened (water-binder) and ammonium conditioning agent is added to it, bringing the content of the main component to 91.2-91.3%. The resulting mixture is forced through a perforated matrix (granulated) and the molded granules are dried in a fluidized bed with simultaneous additional introduction of the same conditioning agent and additive.

With a total content of conditioning additive 3% of the amount of the main component by introducing it in two stages: when granulating the product and drying

granules reach an increase in the dynamic strength of the granules to 78, compared to 65.0-72.0% with the full introduction of the conditioning additive in one of the indicated stages (see table).

EXAMPLE 2 A powdered double superphosphate with a 47% content of the main component is moistened (the calculated amount of water is 14% by weight of dry powder of double superphosphate), the sulfite-alcohol bard conditioning agent is added to it, mixed, and the resulting mixture granulated in a pelletizing drum pellet,

Cf}) the arranged granules are dried in a fluidized bed with simultaneous introduction of the same conditioning additive.

npiT total content of air conditioning additive 2.5% by weight of the granulated product its introduction in two stages increases the dynamic strength of the resulting granules to 77.1-98.8 56 compared to 72.8-75.5% with the full introduction of the conditioning additive in one from the stages (see table).

59864786

The amount of injected additive, in process

Poluchelsh granulated additive method,

mineral fertilizers, including blend Sources

Sewing the original product with svazukh- 5 accepted in the examination of the shim and additional additives, its1. Franchsie patent number 2223335.

granulation and drying of the granules, to. CO5Q 3 / OR, 1974. albeit in that, with a view to -2. USSR author's certificate

above the strength of the granules. Decrease them. O1 J 2/28, 1967

scrub in a dustbag without magnification. “O (prototype).

drying the granules are treated

Claims (1)

Claim A method of producing granular mineral fertilizers, comprising mixing the initial product with a binder and conditioning additive, granulating and drying the granules, characterized in that, in order to increase the strength of the granules, to reduce their abrasion and dustiness without increasing. 986478 6 quantities of the added additive; during the drying process, the granules are treated with a condensing additive.