JPS6214328B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION In order to continuously supply solid substances as well as liquids to a mixing chamber, the present invention comprises one solid substance inlet vertically arranged at one end of the mixing chamber and one conduit under high pressure. at least one type for producing a dispersion, of the type having a tubular mixing chamber with several liquid inlets fed through and also an outlet for removing the dispersion from the mixing chamber. The present invention relates to a device for mixing powdered solid substances and at least one liquid.

Dry ingredients are often mixed with wet ingredients to produce a homogeneous suspension or dispersion.
It is still difficult to obtain a homogeneous mixture, especially in a continuous process. Such continuous processes essentially require that the weight ratio of solid to liquid be kept constant.
In the discontinuous method, for example, a stirrer is used in the container and if stirring is carried out for a sufficiently long time, a satisfactory dispersion can be obtained. However, this method wastes a lot of energy and time, and is not always practicable. In addition, a large-sized mixing device is required to perform mixing efficiently. The container therefore becomes larger and therefore requires significantly more space. Also, in the case of solids that are difficult to wet with liquids, it is difficult to mix them with liquids, especially if the liquid component is to be kept small.

A tubular mixing device is known (US Pat. No. 1,649,062) which has a mixing chamber into which a number of nozzles for introducing liquid components extend into the center. These nozzles produce a fan-shaped spraying liquid jet, which covers the powder to be mixed from the outside, so that the powder is pressed by the liquid against the inner wall of the tubular mixing chamber, adheres to it and gradually becomes layered. I will do it. Over time, the powder that has grown into lumps peels off from the inner wall and is entrained along with the mixed powder. However, this formation of agglomerates is unfavorable for the subsequent use of the mixed powder.

The fan-shaped jet flow of the known nozzle eliminates the central part of the mixing tube as a mixing region, so that only the outer periphery of the mixing chamber constitutes the mixing region.

It is an object of the present invention to provide powdered dry substances and/or fluids which can be carried out continuously, with the weight ratio of solid and liquid being kept at a constant value, to obtain a homogeneous, more or less pasty mixture. It is an object of the present invention to provide an apparatus for producing a mixture, suspension or dispersion of a medium and one or more liquids.

This problem is solved by the means described in the characterizing part of claim 1.

By this measure, the entire cross section of the mixing chamber can be used as a mixing area. As a result, stacking in the lower part of the mixing chamber is avoided. The mixing chamber should be aligned 1° with respect to the vertical line in order to sufficiently eliminate the effects of gravity on the laminate.
at a constant angle, ie, so that it has an approximately perpendicular axis. This allows gravity to be used for the mixing effect, so that overall an improved degree of mixing is achieved with the measures according to the invention, while at the same time the product is kept at a distance from the inner walls of the mixing chamber.

Using the device according to the invention, at least one liquid component under high pressure is applied in the form of a high-pressure liquid jet to a stream of one or more pulverulent dry substances and/or a fluid medium, thereby obtaining The mixture can be discharged continuously.

A purely hydraulic method, in which by using at least one liquid jet under high pressure, mixtures and suspensions or dispersions of the components can be obtained while maintaining a defined supply of the substances to be mixed. In the process, a mixture of the components can be obtained. In this case, the weight ratio of the individual components, as determined beforehand, is more or less maintained in the pasty mixture. By using the liquid component at high pressure, shear forces can be exerted, which ensures complete penetration of the liquid component into the dry component. This also applies when a large amount of powdered material is mixed into a relatively small amount of liquid in order to obtain a homogeneous pasty mixture. Once incorporated, no separation of the components occurs and the resulting mixture, suspension, etc. is stable over a long period of time as far as homogeneity is concerned. Mixing etc. can be completed in a very short time. The mixtures and suspensions or dispersions obtained can be used directly. Mixed costs are extremely low;
Operations such as mixing can be performed continuously.

Mixing using at least one liquid component under high pressure can be carried out for one or more pulverulent dry substances as well as for a fluid medium, and also for simultaneous mixing of dry substances and fluid medium. In the latter case, the dry components can be mixed together beforehand with the addition of one or more liquid components. It is also possible to first mix the several liquid components together and then subject the mixture to at least one liquid jet under high pressure. Furthermore, it is also possible to subject all dry components to be mixed and all liquid components simultaneously to the action of the liquid components under high pressure without having previously mixed them. Furthermore, other dry components and/or
Alternatively, it is also possible to use a liquid component.

The components of the powdered dry substance and the liquid with which it is mixed can be mixed with each other according to predetermined weights or volumes. Preferably, the high-pressure liquid jet is supplied while creating turbulence in the flow of dry substance and/or fluid medium. Depending on the type of powdered dry ingredients and/or the fluid medium (which may be water or a solution, for example), the pressure of the liquid jet which can be maintained within a wide range is, for example, about 10 to 1000 bar.
Advantageously, this pressure is maintained at approximately 50 to 250 bar.

According to another feature of the invention, these inlets can be circular and/or flat discharge nozzles. The nozzles can be oriented axially, radially and diagonally with respect to the longitudinal axis of the mixing tube. In this way, the desired turbulence is created in the substances to be mixed for pressure mixing. By arranging the inlet tangentially to the mixing tube, the desired turbulence effect is better achieved. Particularly when using abrasives, the device of the invention is particularly advantageous, as there are no moving mechanical parts and no need to use them, as in equipment that performs mixing.

Trough conveyors, belt conveyors or feed pipes are used to conduct the dry components and/or the fluidized medium to the point where the high-pressure liquid jet acts. In order to precisely obtain the quantity to be dispensed, known dosing units are used, for example screw conveyors rotating at a predetermined number of revolutions. This allows the metering proportions of dry components and/or fluid medium to be maintained precisely.

The mixing device according to the invention is also suitable for all powdered substances which are more or less difficult to wet and are mixable with liquids, solutions, etc. This also applies to expandable and highly expandable materials which generally expand and/or become more or less viscous when a liquid is added to them.

Special applications for suspensions with marked expansion properties include the use of bentonite (activated clay) in suspensions, for example for the protection and reinforcement of shutters in the building industry.
is to use. Bentonite suspensions are also used to lubricate and strengthen all types of wellbore in the ground. Chiyoke and chemical powders are other examples that can be used. In the food industry, thickeners such as porridge play an important role, for example in the production of ice cream, and in the cosmetics industry, for example in the production of toothpaste. All these substances can be continuously converted into stable mixtures, suspensions, dispersions, etc. by means of the apparatus according to the invention.

Next, the present invention will be explained in detail based on one embodiment shown in the drawings.

The illustrated device for mixing powdered substances and liquids with the addition of predefined amounts is capable of mixing several solid components.

For this purpose, three supply containers 2, 3 and 4 are used, which are provided with funnel-shaped bottoms 5, 6 and 7, for example. At the lower ends of the bases 5, 6 and 7 there are compartment valves 8, 9 and 10 from which feed pipes 11, 12 and 13 are led to a common mixing pipe 14. The discharge of the pulverulent solid components and/or the fluid medium from the supply container is carried out in correspondingly measured amounts, for example by means of a screw conveyor 15,
16 and 17. An intermediate screw conveyor 18 can also be provided for the feed pipes 11 and 13.

A mixing chamber 19 with a discharge pipe is connected to the feed pipe 14, into which pre-measured amounts of the three component substances are introduced, and has inlets 20, 21 for introducing liquid under high pressure or high-pressure water. and 22 are provided. These inlets may be one or more circular and/or flat discharge nozzles, which are arranged axially and/or radially and/or diagonally within the mixing chamber. Mixing chamber 1
It is preferable that a portion of the tube 9 where the discharge nozzle is provided be surrounded by a case tube 23. A pipe 2 from a high pressure pump 25 driven by a motor is connected to this case pipe 23.
4 are connected.

Each component to be mixed, pre-measured by weight or volume, which is collected in succession in a short feed tube 14, is simultaneously subjected to the action of a high-pressure liquid jet by means of nozzles 20, 21, 22, so that the mixing process is without the help of mechanical parts,
Completely hydraulically implemented. The liquid jet under high pressure shears the components to produce the final mixture, suspension, dispersion, etc., especially by creating turbulence in the mixing chamber 19.

The mixing process is performed continuously. By the impacting action of the high-pressure liquid jet, the components fed are brought into the desired mixture or, in the case of dry components, into a more or less pasty substance or into a suspension or dispersion. In this way, a completely homogeneous final product is obtained whose properties, in terms of solid and/or liquid to liquid weight ratio, are generally stable over long periods of time, at least until further processing. . The mixture etc. thus obtained can be used directly for subsequent processing.

One or more dry and/or liquid components can be added to the mixture thus obtained either simultaneously with the high pressure liquid jet or in the mixing zone.

The homogeneous final product can be placed from the mixing chamber 19 into a container used for transport, for example a tank car, without the risk of the components separating during the more or less long transport path. The device according to the invention is characterized in that the mixing chamber 19 is pivotably mounted around a short feed pipe 14 in order to fill a series of conveyor containers etc. one after another in the course of continuous operation, so that the continuous operation does not have to be interrupted. It is advantageous to configure the

[Brief explanation of the drawing]

1 and 2 are elevational and plan views, respectively, of an embodiment of an apparatus according to the invention for mixing a liquid with a powdered substance and/or a fluid medium, and FIG. 3 is taken along the - line in FIG. FIG. 19... Mixing chamber, 20, 21, 22... Liquid inlet, 23... Case pipe, 24... Conduit.

Claims (1)

[Claims] 1. One solid substance inlet arranged vertically at one end of the mixing chamber and one conduit under high pressure for continuously supplying the solid substance as well as the liquid to the mixing chamber. At least one powdered solid substance for producing a dispersion, in the form of a tubular mixing chamber with several liquid inlets supplied and an outlet for removing the dispersion from the mixing chamber. and at least one kind of liquid, the liquid inlet 2
0, 21, and 22 are distributed and installed around the body and back of the mixing chamber 19, and the body and the back are surrounded by a common case pipe 23, and a conduit 24 is guided to the case pipe 23. The liquid introduction ports 20 and 21 arranged around the circumference of the mixing chamber 19 are arranged in the radial direction,
or a device for mixing at least one pulverulent solid substance and at least one liquid for producing a dispersion, characterized in that it is inclined tangentially and/or in the flow direction. 2. Device according to claim 1, in which the mixing chamber 19 with the housing tube 23 is mounted rotatably about a vertical axis. 3. Device according to claim 1, in which the liquid under high pressure has a pressure of 10 to 1000 bar. 4. Device according to claim 3, wherein the pressure of the liquid is in the range 50 to 250 bar.