JPH0629662Y2 - Vacuum dryer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Outline of Field] The present invention relates to an apparatus used for drying fine powder of samarium-cobalt magnet, and generally relates to a structure of a vacuum dryer for obtaining dry powder from sludge which is an easily oxidizable substance. It is a thing.

[Contents and problems of conventional technology] Conventionally, as a method for drying sludge, a method of putting the sludge in a vacuum dryer as it is and vacuum drying, and injecting an inert gas into a vacuum drying container provided with a filter to remove the solvent There are two methods of drying the slurry with an inert gas after squeezing and discharging.
In order to obtain sufficient drying capacity, there is a drawback that the equipment becomes large and the drying efficiency is poor, and in the method of (1), a large amount of inert gas is used, resulting in a large drying cost. was there.

[Purpose of device]

In order to eliminate the above-mentioned drawbacks, the present invention has a structure in which a vacuum drying device has a filtering function as shown in Fig. 1, and the filtration and drying of the sludge in one container can be made compact by one device,
Moreover, the purpose is to carry out at low cost.

[Construction of the Invention] The present invention is a vacuum drying apparatus for drying sludge containing a substance that easily oxidizes, and a vacuum drying container provided with a filter on the bottom surface and a heater on the outer wall is installed from the bottom of the filter. A valve is provided for each pipe branching to the outside air and the vacuum pump, and an inert gas injection valve is provided on the lid on the top of the vacuum drying container, and an inert gas is provided on the pipe from the bottom to the outlet valve. It is a vacuum drying device provided with an injection valve.

[Explanation by Examples]

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

The present invention is configured so that the main body of the vacuum drying container, the filter, the heater, the vacuum suction, and the injection of the inert gas can be used for filtering and drying the sludge in the vacuum drying container. It is characterized in that the sludge, which is a substance that is easily oxidized, can be dried at low cost in terms of both operating costs.

In FIG. 1, with the slurry 10 put in the vacuum drying container 1, the lid 2 of the container is closed, and the inert gas is first injected through the valve 7 for injecting the inert gas during filtration and drying. Then
By opening the valve 5 for discharging the solvent at the time of filtration, the sludge is filtered through the filter 3 (at this time, the valve 8 which is opened when the gas in the container is sucked by the vacuum pump at the time of drying and the clogging of the filter are removed). The inert gas injection valve 6 for use is closed). The solvent filtered through the filter 3 flows from the vacuum drying container 1 in the direction of arrow B and is discharged to the outside. After the filtration is completed, the valves 5 and 7 are closed, the vacuum pump 9 is operated, and the valve 8 is opened to dry the compressed body after filtration. At this time, the compressed body is heated by the heater of 4, and the evaporation of the solvent is promoted by injecting the inert gas little by little through the valve 7, thereby shortening the drying time. If the filter is clogged during drying, the valve 6 is opened with the valves other than the valve 6 closed once, and the inert gas is caused to flow backward from the valve 6 into the vacuum container. , Remove the clogging of the filter.

In the conventional heating type vacuum drying device, in order to shorten the drying time, a method of taking a large heat transfer area is used, so that the container becomes large and in order to handle substances that are easily oxidized,
In order to raise the degree of vacuum in the container, it is necessary to give special consideration to the sealing method for each part of the container, and the vacuum pump also becomes larger as the container becomes larger. It was great. For this reason, as a method for drying the sludge, which is a substance that easily oxidizes, it is general to use a method for drying the sludge using an inert gas, which requires a relatively small facility.
This method is a method in which an inert gas is passed through the sludge in the container to discharge the solvent in the sludge together with the gas to the outside for drying. However, this method has a drawback that a large amount of inert gas is used from the slurry to the dry powder, and the running cost becomes high because the inert gas is expensive.

According to the vacuum dryer of the present invention, since the heater and the inert gas are used in combination, it is possible to perform the drying without requiring a large heat transfer area unlike the conventional vacuum dryer.
Compared to the conventional equipment, the equipment is smaller and the equipment cost can be reduced to about 1/10 of the conventional vacuum drying equipment.
In addition, compared to the conventional method using an inert gas, the amount of this inert gas used can be reduced to 1/5 or less of the conventional one due to the effect of the heater and vacuum pump, which greatly reduces the running cost of drying. Can be reduced. Since the structure of this device is simple and small, it hardly leaks to the outside air, and the series of operations from sludge to pressed body to dry powder can be performed completely without touching the outside air, so it is easily oxidized. It can be widely applied to the drying of substances, and daily maintenance, inspection and cleaning can be easily performed.

[Effect of device]

As described above, by using the equipment according to the present invention, it is possible to significantly reduce the drying cost in a short time.
It has become possible to provide a dry powder of an easily oxidizable substance that is less expensive than before.

[Brief description of drawings]

FIG. 1 is a system diagram of a vacuum dryer according to the present invention. 1 ... Vacuum drying device. 2 ... Lid of container. 3 ... Filter. 4 ... heater. 9 ... Vacuum pump. 10 ... slurry. 5 ... Valve for discharging solvent during filtration. 6 ... Inert gas injection valve for removing clogging of the filter. 7: Valve that injects an inert gas during filtration and drying. 8: A valve that opens when the vacuum pump sucks the gas in the container during drying. A: Discharge port (vacuum exhaust direction). B ... Discharge port ... (solvent outflow direction).

Claims (1)

[Scope of utility model registration request] 1. A vacuum drying device for drying sludge containing a substance which is easily oxidized, wherein a vacuum drying container having a filter on the bottom and a heater on the outer wall is branched from the bottom of the filter to the outside air. Also, the pipes leading to the vacuum pump are each provided with a valve, and an inert gas injection valve is provided on the lid of the top surface of the vacuum drying container, and an inert gas injection valve is provided on the pipe from the bottom to the outlet valve. A vacuum drying device characterized by being provided.