SU1318281A1 - Method of granulating powders - Google Patents

Abstract

The invention relates to the granulation of powders, mainly feeds, with the use of binding agents, and makes it possible to increase the strength and uniformity of the granulometric composition of the granules. In the case with a diameter of 30L) mm load 1.5 kg of hydrated compound feed powder. Air is blown through the grate at a speed of 1 m / s. A 3% solution of sulfite yeast brew (400 ml) was sprayed through the nozzle for 50 seconds. The final moisture content of the granules is 11–13%. The body and the grate are subjected to circular oscillations in the horizontal plane with a radius of 1 cm and a frequency of 0.8-2.5 Hz, and the layer is additionally mixed with a propeller stirrer with a diameter of 140 mm, rotated at 300 rpm. Granulation time 3.5 minutes. The obtained granules have an average size of 1.5-1.6 mm. 1 il. (ABOUT

Description

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The invention relates to the granulation of powders, mainly feed, using special binding agents and can be used in the processes of feeding in animal husbandry, poultry farming and fish farming.

The aim of the invention is to increase the strength and the uniformity of the particle size distribution of the obtained granules.

The drawing shows a device for carrying out the proposed method, a longitudinal section.

The device includes a housing 1 mounted (suspended) on vibration supports 2. An unbalanced two-shaft vibrator 3 is attached to the bottom of the housing. A non-forward valve gas distribution grid 4 is located inside the housing in the lower part, and a spray nozzle 5 is sprayed above the grille. From above, the housing is connected to the cruiser 6 by the confuser 7 with the HELP of the soft insert 8. On the side, under the grill, the housing is equipped with a clamp 9 for supplying heat-transfer gas. On top of the lid 6 there is a nozzle 10 for discharging the heat transfer gas and a hatch 11 for loading granulated material. On the side of the hull, above the grille, the chute 12 is located for unloading. The entire device is suspended on a hinged suspension 13. Additionally, the device is equipped with a propeller stirrer 14 installed above the gas distribution grid and a crank mechanism 15 with the possibility of rotation in the horizontal plane. The mixer 14 and the crank mechanism 15 is driven into rotation by the electric motor 16 through the gearbox 17 by means of a shaft equipped with an elastic insert 18. The hole in the housing, through which the shaft passes, is sealed by an elastic membrane 19,

The device works as follows.

Through the hatch 11 download the crushed (powdered) components of the stretchable mixture in an arbitrary sequence, not mixed with each other. Include the vibrator 3.

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The mixture is fluidized by vibration. The mixer 14 and crank mechanism 15 are turned on. The fluidized mixture is intensively stirred.

and acquires circular (precessional) wave-forming movements (swing). After the mixture is averaged, the binder solution is fed through the nozzle 3. The vertical mixing of the fluidized mixture, carried out by the stirrer 14, continuously updates the surface on which the binder solution is sprayed, what.

provides uniform wetting of the mixture without lumping. Under the action of vibration, loose, relatively small polydisperse granules are formed in the moistened mixture. These pellets are rolled by the action of precessional, pumping circular disturbances imparted by the crank mechanism 15. After completion or during the granulation process, the heated gas (air) is fed through the fitting 9 and the gas distribution grid 4. When the required strength of the pellets is reached, the binder is stopped solution and turns off the drive of the agitator and the crank mechanism. The vibrated layer of granules is dried with hot gas (air) to the desired final moisture, after which the granules are discharged through the chute 12. The vibrator drive and the heat carrier gas are turned off. The cycle is repeated.

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Claims (1)

Invention Formula A method of granulating powders, including spraying a fluidizing powder with a binding fluid onto a fluidized bed while simultaneously mixing the bed with a rotating stirrer and supplying heat-transfer gas through the bed, which is characterized by the fact that, in order to increase the strength and uniformity of the particle size distribution, a layer of powder is subjected to circular oscillations in a horizontal plane with a chop of from 0.8 to 2.5 Hz. c: f1 Compiled by R.Gor inova Editor I.Nikolaychuk Tehred L.Oliynyk Order 2452/6 Circulation 510 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4 Proofreader A.Ilyin