RU2585466C1 - Method of producing activated suspension using disc crusher - Google Patents

Abstract

FIELD: technological processes.

SUBSTANCE: invention relates to production of suspension with simultaneous milling of solid fraction and can be used, in particular, in production of construction materials, in power engineering. Method consists in that suspension is fed into chamber 1 of rotor disc crusher, then mixture is accelerated. Grinder comprises rotary shaft 5 and coaxially installed on shaft 5 centrifugal discs 4, separated by partition walls 7, extending from chamber walls 1 and covering peripheral part of discs 4, and mixture is accelerated by said discs 4, solid component of suspension is milled both due to collision with surfaces of discs 4 and walls of chamber 1, and due to formation of turbulent autogenous milling zones between discs 4 and walls 7.

EFFECT: higher efficiency of milling solid particles of suspension and degree of homogenisation of suspension.

6 cl, 4 dwg

Description

The invention relates to a technology for producing a suspension with its simultaneous activation (grinding of solid fraction) and can be used in construction, production of building materials, coal energy, as well as other industries where suspensions are used.

The prior art method for producing activated suspension using a disk grinder (see USSR author's certificate SU 1734826, 05.23.1992) containing a rotating shaft with disks installed in the grinding chamber, the disks being separated by vertical partitions connected to the chamber walls by means of springs and equipped with holes and wavy recesses. Moreover, the shaft is made hollow with helical radial holes and recesses for grinding balls. When implementing the method, the suspension enters the space between the disks and partitions. Vertical partitions, interacting through balls with a rotating shaft, begin to make oscillating movements, which ensures intensification of grinding.

The disadvantage of this method is its complexity and low efficiency.

The prior art technology for producing activated suspension without the use of grinding balls.

The known method (see US patent US 3536266, 10.27.1970 - the closest analogue), which uses a disk chopper containing a grinding chamber with a rotating shaft placed on it, on which the disks are mounted. When implementing the method, the suspension is loaded into the chamber and dispersed during the rotation of the disks, as a result of which the solid component is crushed due to the collision of the suspension with the surfaces of the disks and the walls of the chamber. However, this method also does not provide sufficient grinding efficiency.

The objective of the invention is to eliminate the disadvantages of analogues.

The technical result of the invention is to increase the efficiency of grinding solid particles of the suspension and the degree of homogenization of the suspension.

The specified technical result is achieved due to the fact that the method of producing the activated suspension includes feeding the suspension into the chamber of a rotary disk grinder, comprising a rotating shaft and centrifugal disks mounted on the shaft, separated by partitions passing from the chamber walls and overlapping the peripheral parts of the disks, and accelerating the mixture with said disks with the provision of grinding the solid component of the suspension due to the collision of the suspension with the surfaces of the disks and the walls of the chamber, as well as the formation of turbines self-grinding zone between disks and partitions.

In addition, the specified technical result is achieved in private embodiments of the invention due to the fact that:

- use a two-rotor disk chopper containing an additional rotating shaft and centrifugal disks coaxially mounted on the shaft, while providing multidirectional rotation of the shredder shafts;

- carry out the regulation of the volume of the suspension with the provision of a given load;

- the suspension is fed into the chamber through the sand outlet of the hydrocyclone;

- the suspension is supplied to the chamber by a centrifugal impeller or disk pump through an accelerating nozzle;

- after removing the suspension, it is returned to the grinder chamber, performing cyclic processing until the desired size of the solid component is obtained.

In contrast to the known analogues, the inventive method uses a disk shredder containing fixed partitions extending from the chamber walls to the center of the disks and partially overlapping the surface of the disks in their peripheral part. Thanks to this design, the grinding of the solid component of the suspension is carried out not only due to the collision of solid particles with the walls of the grinding chamber, but also due to the formation of turbulent zones of self-grinding. In this case, more intensive grinding of the solid component of the suspension occurs with its activation and heating. As a result, the productivity (efficiency) of the method and the degree of homogenization of the suspension are increased.

The invention is illustrated by drawings, where:

in FIG. 1 shows a first embodiment of a device for implementing the inventive method;

in FIG. 2 shows a second embodiment of a device for implementing the claimed method;

in FIG. 3 shows an embodiment of a method using an impeller or disk pump;

in FIG. 4 shows the grinding scheme in the processing zone of the suspension.

A device for implementing the inventive method according to the first embodiment of the invention (Fig. 1) is a single-rotor chopper containing a grinding chamber (1) with inlet (2) and output (3) nozzles and centrifugal disks (4) installed in the chamber (1) coaxially on the shaft (5) with a rotation drive (6). The disks (4) are separated by solid fixed partitions (7) extending from the walls of the chamber (1) to the center of the disks (4) and overlapping the peripheral parts of the disks (4), but not overlapping their remaining parts.

A device for implementing the inventive method according to the second embodiment of the invention (Fig. 2) is a two-rotor chopper and, in addition to the design according to the first embodiment, contains an additional second shaft (8) with a drive (9). Centrifugal disks (4) are also placed on the additional shaft (8), while the shafts (5) and (8) are installed in the chamber (1) in parallel with the partial overlapping of the surface of the disks (4). These shafts (5) and (8) rotate in different directions.

In the first and second variants, the shafts (5) and (8) can be oriented both horizontally and vertically.

In the particular case of the claimed invention, the suspension to be treated (Fig. 3) can be fed into the grinding chamber (1) by a centrifugal impeller or disk pump (10) through the booster nozzle (11) connected to the inlet pipe (2) (see Fig. 3).

The method is implemented as follows.

The processed suspension through the inlet pipe (2) is fed into the chamber (1). The suspension, falling onto the rotating disks (4), is discarded to the periphery under the action of centrifugal force. An annular treatment zone (12) is formed in the peripheral part, where pressure P = m _a / S is created, where m _a is the suspension mass, and S is the total area of the boundary layer in which the pressure is increased (see Figs. 1, 2). The pressure P depends on the geometric dimensions of the grinding chamber, the diameters of the disks, the density of the suspension and the speed of rotation of the shafts of the drives. Due to the presence of partitions (7) in the indicated zone (12), the suspension stream discharged to the periphery collides with the oncoming stream of the suspension already processed (see Fig. 4). Moreover, taking into account the viscous friction forces, the suspension layers adjacent to the disk (4) have velocities that are relatively close to the speed of the disk points on the abutment surface, and the velocity of the layer adjacent to the partition (7) tends to zero. Due to this, in the spaces between the disks (4) and partitions (7), turbulent zones (13) are formed in which active self-grinding of the suspension occurs (see Fig. 4).

The suspension particles that are largest and heaviest at the moment of processing are not able to leave the treatment zone (12) due to the action of centrifugal forces, which ensures guaranteed grinding.

In the case of the second embodiment, using a two-rotor grinder (see Fig. 2), in addition to the processes described above, in the overlap zone (14) of the surface of the disks (4) of the shafts (5) and (8), the suspension is pressed into the gap between the centrifugal force disks (4), which provides a collision of flows with a speed equal to the sum of linear and centrifugal speeds of grinding disks. Thus, in this embodiment, grinding is most intensive.

In the grinding process, the volume of suspension is regulated to ensure a given load. The distance between the disks (4), as well as the distance between the walls (4) is selected based on the properties of the suspension.

The suspension can be supplied to the chamber from the sand outlet of the hydrocyclone.

Optionally, grinding can be carried out cyclically: after removing the suspension, it is returned to the grinder chamber, processing to obtain the required size of the solid component.

Further, an example discloses a technology for preparing a concrete mixture using the inventive method.

To prepare the concrete mixture, first, according to the described technology, a suspension is prepared from dosed in the required proportion of water and a binder capable of hydration (cement, granulated slag, clinker with gypsum, etc.). During the operation of the device, the necessary grinding of the binder occurs, activation and homogenization to form a homogeneous suspension (cement paste). Then the resulting cement paste is fed into a concrete mixer and kneaded with aggregates.

The proposed method provides an increase in the degree of activation of the concrete mixture, the rate of hardening, a more complete passage of the cement hydration process, a decrease in the consumption of binder and the cost of preparing the concrete mixture due to the exclusion from the process of fine grinding of clinker in cement plants and storage of cement directly in moisture-proof storages until use.

Similar to the process of preparation of cement paste, drilling and other special solutions are prepared, the preparation of which requires dispersion and homogenization.

The proposed method can be used:

- in the production of concrete mixtures and products from them;

- in the manufacture of cellular concrete;

- for the preparation and weighting of drilling fluids;

- for the preparation of water-coal and water-peat fuel.

Thus, in the claimed method there is an intensive grinding of the solid component with activation and heating. In fact, fine grinding of the solid component is carried out in conjunction with intensive homogenization. By adjusting the speed of rotation of the rotors, the gap between the centrifugal disks and the baffles, it is possible to obtain the required suspension processing parameters with high accuracy. The proposed method is simple, high productivity and efficiency due to the absence of grinding media and wearing parts, as well as the ability to control the degree of grinding.

Claims (6)

1. A method of producing an activated suspension, comprising feeding the suspension into the chamber of a rotary disk grinder, comprising a rotating shaft and centrifugal disks mounted on the shaft, separated by partitions passing from the chamber walls and overlapping the peripheral parts of the disks, and dispersing the mixture with said disks to ensure grinding of the solid suspension component due to the collision of the suspension with the surfaces of the disks and the walls of the chamber, as well as the formation of turbulent self-grinding zones between the disks and the partition and. 2. The method according to p. 1, in which a two-rotor disk shredder is used, comprising an additional rotating shaft and centrifugal disks coaxially mounted on it, while providing multidirectional rotation of said shredder shafts. 3. The method according to p. 1 or 2, in which the volume of the suspension is adjusted to ensure a given load. 4. The method according to p. 1 or 2, in which the suspension is supplied into the chamber through a sand outlet of a hydrocyclone. 5. The method according to p. 1 or 2, in which the suspension is supplied to the chamber by a centrifugal impeller or disk pump through an accelerating nozzle. 6. The method according to p. 1 or 2, in which, after removing the suspension, it is returned to the grinder chamber, performing cyclic processing to obtain the desired size of the solid component.

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