RU2503489C1 - Method of loose material mixing - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention relates to mixing of loose materials and can be used in chemical, peat-and-coal and construction industries. Proposed method comprises metering out of initial components, alternate layering of components in horizontal circular layers between resilient vessel walls and circular baffle aligned therewith, straining said vessel by drive on reciprocating vessel outer edge along vessel axis and discharging of prepared mix.

EFFECT: higher efficiency of mixing.

6 dwg, 1 ex

Description

The invention relates to the processing of bulk materials and can be used in chemical, construction, peat and in some other industries for the preparation of bulk mixtures.

A known method of mixing bulk materials (US Pat. No. 2332995 Russia, publ. 07/20/2008, bull. No. 20, IPC B01F 3/18), including dosing of the original components, layered alternately laying the components between the walls of the elastic tank and the vertical partition, periodic deformation containers in the radial direction from two opposite sides and unloading the finished mixture.

The partition is made in the form of vertical spiral ribbons. Mixed components are distributed between them in layers, which leads to an increase in the contact surface of the phases and an increase in the homogeneity of the resulting mixture. The final mixing of the components occurs with periodic exposure to them of the elastic walls of the tank, deforming during its rotation.

The homogeneity of the mixture obtained by this method is relatively low due to a slight effect on the layers located in the center of the tank. In addition, the process may not be efficient enough due to the insignificant mixing effect of the radial direction on the layers of the mixture vertically located in the tank, especially the layers located in the central part of the tank.

Closest to the proposed technical solution is a method of mixing bulk materials (US Pat. Of Russia No. 2380148 Russia, publ. 01/27/2010, Bulletin No. 3, IPC B01F 3/18), which includes dosing of the initial components, layer-by-layer layer-by-layer laying of components with horizontal annular layers between the walls of the elastic container and the annular partition coaxial with it, periodic deformation of the container by the drive device and unloading of the finished mixture.

The homogeneity of the mixture obtained by this method, as in the previous method, is reduced due to the relatively small effect on the layers adjacent to the annular partition (the intensity of the mixing effect decreases from the periphery to the center of the tank). In addition, when mixing some components, the process may be ineffective due to the insignificance of mixing (shuffling) of the layers spaced apart from each other in the vertical container.

The objective of the invention is to increase the efficiency of the mixing process.

To solve this problem, a method for mixing bulk materials is proposed, including dosing of the starting components, layer-by-layer stacking of components by horizontal annular layers between the walls of the elastic container and the annular partition wall coaxial to it, periodic deformation of the container by the drive device by reciprocating movement of the external section of the container along its axis and unloading the finished mixture.

Figure 1 shows a General view of a device for implementing the proposed method of mixing bulk materials.

Figure 2 shows the capacity at the end of the layering of components in it. Figure 3 shows the circulation of components in a tank. Figure 4 shows the beginning of the overload of the mixture in the auxiliary tank. Figure 5 shows the moment the end of the overload of the mixture in the auxiliary tank. Figure 6 shows the moment of unloading the finished mixture from the device.

A device for implementing the method of mixing bulk materials (figure 1) contains an elastic container 1, the inner slice of which is fixed to the frame 2, and the outer one is connected to the drive of the reciprocating movement via cables 3, envelope pulleys 4 and an elastic container 5 suspended on the frame 2 , in the lower part of which a shutter 6 is installed, also connected to the reciprocating drive by a cable 7, enveloping the pulley 8. The device also includes (dispensers) component supply pipes 9, 10 and the conveyor 11.

The first component (A) through one of the nozzles 9 enters an additional container 5. When the reciprocating drive is turned on, the cable 7 moves the shutter 6 up and the container 5 deforms with the formation of an annular cavity, inside of which component A. This cavity (deformation wave) moves up. The component A located in it is evenly distributed around the circle, forming an annular layer. When the cavity (deformation wave) reaches the inner cut of the tank 1, the component A located in it is poured into the tank 1, forming an annular layer in it. Then the shutter 6 is lowered, the container 5 takes its original shape and component B is fed through the pipe 10. The cycle is repeated, and the layer of component B is in the container 5 on top of the layer of component A. After several cycles, the container 1 is layer-by-layer loaded by components A, B (Fig. .2). Then, the drive of the cable 3 is connected, connected with the external cut of the container 1. When the external cut of the container 1 is moved vertically upwards, the components located in it begin to circulate in radial planes and are actively mixed (Fig. 3). Their movement is similar to the movement of components in a drum mixer with a smooth cylindrical body. When changing the direction of movement of the drive (downward movement), the direction of circulation of the mixture changes. When the amplitude increases above a certain value, the overload of the mixture of components into the chamber 5 (Fig. 4) begins, from where the finished mixture is unloaded through the shutter 6 to the conveyor 11 (Fig. 6).

The proposed method allows to increase the uniformity of the resulting mixture by equalizing the fluctuations in the concentration of components in the tank in the radial direction. This is ensured by organizing the circulation (in radial section) of the pre-layer-loaded mixed components. The combination of systematic mixing, which ensures equalization of the concentration of components around the circumference of the annular volume of the mixture in the tank, as well as the significantly developed contact surface of the components to be mixed in the layers with diffusion mixing (occurring when the components are circulated in the radial direction), can significantly increase the efficiency of the mixing process.

Example

Preparation of a two-component mixture in a device with a container with an outer diameter of 400 mm, an inner diameter of 150 mm and an initial height of 150 mm.

The properties of the particles of the first component: bulk density - 419 kg / m ³ (granular silica gel), average particle diameter - 2.75 mm. The properties of the particles of the second component: bulk density - 1500 kg / m ³ (river sand), average particle diameter - 1.25 mm. The volume of loading Q = 10000 cm ³ . The loading volume of the components Q ₁ = 6000 cm ³ , Q ₂ = 4000 cm ³ .

When the volume of loading the layer 1000 cm ^{3 the} coefficient of heterogeneity of the mixture obtained after 10 deformation cycles of the elastic capacity is 7%. With a layer loading volume of 500 cm ^3, the heterogeneity coefficient of the mixture obtained after 10 deformation cycles of the elastic capacity is 5%.

Claims (1)

A method of mixing bulk materials, including dosing of the starting components, sequential layering of components by horizontal annular layers between the walls of the elastic container and the annular partition wall coaxial with it, periodic deformation of the container by the drive device and unloading of the finished mixture, characterized in that the deformation is carried out by reciprocating the external cut capacities along its axis.

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