JPH0622666B2 - Suspension preparation device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a so-called suspension preparation device that automatically mixes powder and liquid to form a suspension, and a suspension in a powder processing step. The present invention relates to an apparatus that can be used for manufacturing a liquid or for sampling for measuring a wet particle size distribution in the same process.

<Prior Art> When a powder and a liquid (medium solution) are automatically mixed in a powder processing step to form a suspension, conventionally, a water tank is filled with the medium solution, and the powder is placed therein. A method of pouring and stirring, or a method of pouring powder first and then pouring a liquid into it and stirring is adopted.

In any case, the powder is generally charged by putting the powder in a container, carrying the powder from the outside, and replacing the container on a water tank to empty it.

<Problems to be Solved by the Invention> In the conventional method as described above, a dust is generated at the time of charging the powder, and the periphery of the device is dirty, or finer particles are more likely to scatter, and thus the obtained suspension is obtained. There is a problem that the particle size distribution of the powder inside changes.

<Means for Solving the Problems> An object of the present invention is to provide a suspension preparation device in which dust is unlikely to scatter to the outside, and its configuration is shown in FIGS. 1 and 2 corresponding to the embodiment. However, the suspension preparation device of the present invention is configured such that the powder and the medium liquid are charged into the inside of the hopper 1 from the upper opening, and the suspension obtained by mixing the two is discharged from the bottom of the hopper 1. In the device derived from, the pipe 2 communicating with the liquid medium pump 3 is provided along the inner circumference in the vicinity of the upper opening of the hopper 1, and the pipe 2 is provided with a plurality of jets that open toward the inside of the hopper 1. It is characterized in that the openings 2a are uniformly provided, and the liquid medium is jetted in a film form from the jet outlets 2a so as to cover the upper opening of the hopper.

<Operation> The dust generated in the hopper 1 when the powder is put into the hopper 1 is confined in the hopper 1 due to the presence of the medium liquid film formed so as to cover the upper opening of the hopper 1. And will not scatter out of the hopper 1.

<Embodiment> FIG. 1 is an overall configuration diagram of an embodiment in which the present invention is applied to an on-line wet type particle size distribution measuring apparatus, and FIG. 2 is a perspective view of an upper portion of the hopper 1.

In the apparatus of this embodiment, the powder P and the liquid medium L are mixed in the hopper 1 to form a suspension S, and the suspension S is temporarily stored in the suspension tank 10 and then the particle size is changed. Distribution measuring device 14
Be led to.

At the outlet of the hopper 1, a glass cell 4, a light source 5 sandwiching the glass cell 4 and a light detection sensor 6 are provided, and the output of the light detection sensor 6 is taken into a bulb drive circuit 7. The valve drive circuit 7 opens either the valve 8 or 9 depending on the magnitude of the output of the light detection sensor 6. That is, if powder is present in the liquid flowing out from the outlet of the hopper 1 and the output of the light detection sensor 6 is below a specified value, that is, if the suspension S is flowing out of the hopper 1, the valve is opened. 8 is opened and the valve 9 is closed, and when there is no powder in the outflowing liquid and the output of the light detection sensor 6 exceeds the specified value, that is, the liquid medium L flows out from the hopper 1. In this state, the valve 8 is closed and the valve 9 is opened.

A suspension tank 10 is arranged downstream of the valve 8, and the suspension S flowing out from the hopper 1 is stored in the suspension tank 10. Further, a liquid medium tank 11 is arranged downstream of the valve 9.

The suspension S introduced into the suspension tank 10 is sent to the particle size distribution measuring device 14 by the suspension pump 13 while being stirred by the stirrer 12. In the particle size distribution measuring system including the suspension tank 10 and the particle size distribution measuring device 14, the suspension tank 10
The suspension S in the suspension S is diluted by a known method and drained.
The particle size distribution of the powder P inside can be measured.

Now, in the vicinity of the upper opening of the hopper 1, there is provided a pipe 2 which communicates with the discharge port of the liquid medium pump 3 and which goes around the inner circumference of the hopper 1 once. In this case, a large number of injection ports 2a opening toward the inside of the hopper 1 are uniformly formed.

The liquid medium L to be charged into the hopper 1 is supplied from the outside of the device to the valve 1
5 is temporarily stored in the liquid medium container 11 through the medium liquid pump 3
Is driven to be introduced into the hopper 1 through the pipe 2 by the injection from the injection port 2a. As a result, in the drive state of the liquid medium pump 3, the liquid medium L is
As shown in FIG. 2, it is introduced into the hopper 1 while being jetted in a film shape so as to cover the upper opening of the hopper 1.

Further, the powder P is carried in the powder container 16 and is fed from above the upper opening of the hopper 1.

Next, the operation will be described.

The liquid medium pump 3 is constantly driven, and a film of the liquid medium L is always formed on the hopper 1.

When the powder P is not charged into the hopper 1, the valve 8 is closed based on the output of the light detection sensor 6, the valve 9 is opened, and the liquid medium L is transferred between the hopper 1 and the medium liquid container 11. Circulate. The amount of the liquid medium L in the liquid medium container 11 is maintained at an appropriate amount by detecting the liquid level and opening / closing the valve 15 appropriately.

In this state, if the suspension S is requested, the powder P is carried by the container 16 and emptied above the hopper 1. As a result, the powder P falls and dust is generated in the hopper 1. The dust is the liquid medium L formed on the hopper 1.
The film is trapped in the hopper 1 and does not scatter to the outside, but is finally taken into the liquid medium L.

When the suspension S flows out from the outlet of the hopper 1 by charging the powder P into the hopper 1, the amount of light incident on the light detection sensor 6 decreases and its output changes, whereby the valve 9 closes. Then, the valve 8 is opened and the suspension S is guided into the suspension tank 10.

In the above embodiment, the injection port 2a may have a slit shape or a large number of pinhole shapes, and the shape is not limited as long as it can form a liquid medium film.

Further, the shape of the hopper 1 may be any shape such as a cylindrical shape or a rectangular shape.

Furthermore, in addition to the above-mentioned optical detection of particles, for example, a method of capturing a change in dielectric constant can be adopted.

<Effects of the Invention> As described above, according to the present invention, the hopper for charging the liquid medium and the powder from the upper opening to make a suspension is provided on the inner circumference in the vicinity of the upper opening. Along with this, a pipe that is in communication with the liquid medium pump and is provided with a plurality of injection ports that open toward the inside of the hopper is evenly installed so that the upper opening of the hopper is covered through the injection ports. Since the film of the liquid medium is formed, the dust generated in the hopper when the powder is put into the hopper is confined inside the hopper by the film of the liquid medium and is not scattered to the outside. As a result, it is possible to prevent a change in particle size distribution due to scattering of fine particles, and it is possible to prevent stains around the particle due to dust.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of an embodiment of the present invention, and FIG. 2 is a perspective view of an upper portion of the hopper 1. 1 ... Hopper 2 ... Piping 2a ... Injection port 3 ... Medium liquid pump 4 ... Glass cell 5 ... Light source 6 ... Light detection sensor 7 ... Valve drive circuit 8, 9 ... Valve 10 ... Suspension tank 11 ... Medium container 16 ... Powder container L ... Medium liquid P ... Powder S ... Suspension

Claims (1)

[Claims] 1. A device for injecting a powder and a liquid medium into the inside of an upper opening of a hopper and discharging a suspension obtained by mixing the two from an outlet at the bottom of the hopper, in the vicinity of the upper opening of the hopper. Along the inner circumference of the pipe, a pipe communicating with the liquid medium pump is provided, and a plurality of injection ports that open toward the inside of the hopper are evenly provided in this pipe. A suspension preparation device, characterized in that the liquid medium is jetted in a film form so as to cover the opening.