JPS62225235A - Method and apparatus for preparation slurry - Google Patents

Abstract

PURPOSE:To easily prepare slurry having a dispersed state of primary particle in a short time by giving ultrasonic wave vibration to a mixed fluidized material having the dispersed state of secondary particle in a transfer route of a continuous mechanical mixer. CONSTITUTION:Powder introduced from a hopper is stirred, mixed and transferred together with fed liquid by means of a screw 5 and stirring blades 6 or the like and made to a dispersed state of secondary particle. Then this fluidized material receives ultrasonic wave vibration generated from an ultrasonic resonator 10 which is provided to a duct reaching a discharge side of a discharge port of a mixing drum and particles these selves are vibrated and made to the dispersed state of primary particle during the transfer. Further efficiency is enhanced by converging the ultrasonic wave generated from the ultrasonic resonator and using it. This method can be applied for preparation of various slurry but remarkable effect is exhibited especially by applying this method for self leveling application wherein dispersion in a short time is required.

Description

Detailed Description of the Invention (Industrial Application Field) This invention mixes powder and liquid to produce 2g of uniform slurry.
This invention relates to a method and apparatus for manufacturing.

(Prior art and its problems) Mixing of powder and liquid is used not only in the general chemical industry but also in civil engineering.
It is also a necessary means for mixing cement mortar and other materials in fields such as architecture.

In this type of solid-liquid mixing, in addition to obtaining homogeneity of the mixture, i.e., slurry, the mixing time may be limited in order to avoid undesirable phenomena such as coagulation or air bubbles during kneading. There is a need to shorten the .

Conventional mixing is usually carried out in a mechanical mixing bag J, and although secondary particle dispersion is relatively efficient, the process from secondary particle dispersion to primary particle separation is inefficient. , which is undesirable because it requires power and time.

(Object of the Invention) An object of the present invention is to shorten the residence time of a mixture in a mixing device so that a homogeneous slurry can be continuously prepared and discharged.

(Structure of the Invention) In the present invention, the mechanical mixing device refers to a continuous device including drive type and non-drive type known mixing devices, and the flow of the mixture in the device (that is, up to the discharge end) Refers to a device having a transfer path, especially a tubular transfer path.

The present invention is capable of delivering a fluid mixture in a state of dispersion of secondary particles to a predetermined target location as a state of dispersion of primary particles during stirring or transfer of the fluid mixture through the pipe of the tubular transfer path (pipe) of the above-mentioned device. As a result, a homogeneous slurry can be prepared continuously in a short period of time.

If the ultrasonic transducer applied to the present invention is a magnetostrictive type, it may be installed at any location in the pipeline, and may be installed at multiple locations. It is more efficient if the frequency of the vibrator is equal to the frequency of the vibrator, and its output is appropriately selected in balance with the mixing ability of the device.

In the present invention, the particles of the secondary particle dispersion mixture in the transfer pipe are themselves vibrated by ultrasonic vibration and easily become the primary particle dispersion state, thereby increasing the efficiency of the device, which was previously inefficient. can be improved.

Furthermore, since the present invention can be applied without modifying conventional mixing equipment, the conventional equipment is not wasted and is therefore economical.

(Application Examples of the Invention) As described above, the present invention can be used for various slurry preparations, but it exhibits remarkable effects particularly when applied to self-leveling construction that requires short-time dispersion.

Therefore, a method for preparing a self-leveling material exhibiting high fluidity and a mixing device thereof will be described below.

In order to perform self-leveling construction with high quality and precision, it is necessary to prepare a slurry that has both high fluidity, self-smoothness, and material separation resistance, but the high fluidity and material separation resistance of the slurry are contradictory conditions. It is. Thickeners, dispersants, etc. are added to impart these properties, but it generally takes a lot of time to uniformly disperse these and the main ingredients, hydraulic substances and fillers. be.

Even in the above-mentioned conventional mechanical mixing device, fluidity is insufficient for about 20 seconds, and powder or partial agglomeration occurs, making it difficult to obtain a desired slurry in a short time.

In order to overcome this problem, the equipment was extremely large.
They had no choice but to significantly limit the supply of snacks.

According to the present invention, a good slurry of self-leveling material can be obtained in a short time, and the construction period can be shortened.

Although the above description has been made with reference to an a-continuous type mixing apparatus, the method of the present invention can also be used in a batch type apparatus, and the effects are the same.

(Description of the device) A typical configuration example of the device of the present invention is as shown in FIGS. The mixing cylinder is equipped with a screw (5) and stirring blades (6) on a central rotating shaft (4) directly connected to a drive source (3). (7) is a liquid supply pipe.

The powder is stirred and transferred by the screw (5), mixed with the supply liquid, and mixed by the stirring blade (6) to become a secondary particle dispersed state.

This fluid receives ultrasonic vibrations from an ultrasonic vibrator (10) installed on the discharge side of the mixing barrel or through the pipe (8) to the discharge port (9), and the particles themselves are The primary particles become dispersed during vibration and transportation.

The ultrasonic vibrator (!O) is fixedly installed opposite to the outer periphery of the tube wall and is driven by an ultrasonic generation source (11). As a result of experiments, the effective frequency is 15,00082 or more.

FIG. 3 shows an example of a non-drive type mixer, in which the central shaft (4a) and screw blades (5a) are fixed within the barrel.

(Example) Using the apparatus shown in FIG. 1, and using "Denka SLJ" manufactured by Denki Kagaku Kogyo ■ as a cement-based self-leveling material, the particle size of cement slurry after mixing was 1.

At about 500 cps, a performance of about 30 minutes was obtained under the following conditions.

Volume of stirring and mixing part Ik: 2ft Shaft rotation speed: 400rp■ Drive part crab 3.7 kW Stirring and mixing section passage time: 4 seconds Ultrasonic vibrating part (pipeline) capacity: 5 sentences Ultrasonic output crab 0.5 Oscillator: 20,000Hz Vibration application time: 10 seconds The resulting slurry was as shown in the table below.

The slurry obtained in the above example was
), a good horizontal floor base was obtained as a result of construction to a thickness of approximately 1 ha on a rough concrete base.

In the above table, Comparative Example (1) is the slurry property at the same water ratio when no ultrasonic vibration is applied in the Example device, and Comparative Example (2) is the slurry property at the same water ratio to obtain the same flow. This relates to the properties of slurry when the

Furthermore, in order to obtain a slurry with the same properties as in the above embodiment with the same capacity using only a conventional mixing device, the capacity of the mixing section must be 801 and the driving force must be 5.5 kW, which is extremely uneconomical and inconvenient. Efficiency is obvious.

According to the present invention, it is possible to reduce the drive output and downsize the drive unit, and at the same time, it is possible to prepare a good slurry in a short time.

[Brief explanation of drawings]

1 to 3 are schematic configuration diagrams of an apparatus according to an embodiment of the present invention. (5)...Screw (6)...Each faction wing (8)・
・・Pipe line (10) ・・Ultrasonic transducer 1
Figure 1

Claims (3)

[Claims] (1) The powder is brought into contact with a liquid during agitation transfer or during agitation, mixed to form a secondary particle dispersed state, and then ultrasonic vibration is applied in the transfer path of the mixed fluid to form a primary particle dispersed state. A slurry preparation method characterized by: (2) The slurry preparation method according to claim 1, wherein the powder is a raw material composition for a self-leveling material. (3) A tubular mixing/stirring device comprising a powder input section at one end and an agitation/mixing means together with a transfer screw in a pipe line having a discharge port at the other end; A slurry preparation device with an ultrasonic vibrator placed around the outer circumference of the tube wall.