JPS6237326A - Apparatus for producing oxide powder of sintered pellets - Google Patents

Abstract

PURPOSE:To produce oxide powder of sintered pellets into which unoxidized coarse grains are not incorporated by successively providing means for crushing, heat treating, rolling over and pulverizing via conveying means in a negative pressure hood and continuously treating the pellets. CONSTITUTION:The defective pellets of the sintered pellets for atomic fuel are fed from a hopper 6 into a crushing machine 4 by which the pellets are crushed. The crushed raw material is packed into a vessel 13 provided to a conveyor 12 and is fed to a heat treating machine 3 on the down stream, by which the raw material is subjected to an oxidation treatment. The crushed raw material subjected to the oxidation treatment is fed to a rolling over machine 11, by which the vessel 13 is rolled over to drop the crushed raw material subjected to the oxidation treatment into a lower pulverizing machine 9. The pulverized raw material is fed to a classifier 10 by which the raw material is classified. The raw material having the prescribed grain size is packed through a feeder 16 into a product can 18 on a weighing machine 20. Since the inside of the hood 1 is maintained under negative pressure, the splashing of the splashing powder to the outside of the hood is obviated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a sintered pellet oxidized powder manufacturing apparatus for automatically converting supplied sintered pellets into oxidized powder.

[Technical background of the invention and its problems]

The commonly used sintered pellet oxidized powder production equipment has a separate and independent configuration of a feeding device, an oxidizing device, and a crushing device, and the supply to each device is batch-type.
Since the sintered pellets are directly oxidized in the oxidation furnace, the oxidation rate is slow, and in the case of nuclear fuel sintered pellets, there is criticality control, that is, there is a limit to the number of nuclear fuel sintered pellet processing holes that can be filled into containers, and the distance between the containers must be controlled. The image must be viewed at a predetermined distance, the amount of batches handled is small, and work efficiency is poor.
In addition, since each device is a batch type, there is a

Since each worker operates independently, there is a drawback that it takes a considerable amount of time to complete the work.

[Purpose of the invention]

The present invention has been made in view of the above points, and the supplied sintered pellets are coarsely pulverized and then oxidized, and the oxidized sintered pellets are finely pulverized and classified to form unoxidized raw material coarse particles. It is an object of the present invention to provide an apparatus for producing oxidized powder of sintered pellets, which prevents oxidized powder from being mixed into the product and allows each step to be performed continuously.

(Summary of the Invention) The present invention provides an endless conveyance device in which reversible containers are provided at intervals in the running direction, and the endless conveyance device is disposed in a hood with an internal space under negative pressure. A coarse crusher, heat treatment machine, and reversing machine are arranged in sequence in the running direction.
Furthermore, by installing a pulverizer and a feeding device below the reversing machine, defective nuclear fuel sintered pellets can be automatically processed into oxidized powder products.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings.

In FIGS. 1 and 2, reference numeral 1 denotes a hood that surrounds the entire device, and a large hood 2 is provided at an appropriate location on the upper surface of this hood 1 and is connected to an exhaust duct 1- (not shown).
The inside of the hood 1 is maintained at a negative pressure to prevent the scattered powder from leaking to the outside. Also, the inside of the hood 1-
A coarse grinder 4 for coarsely grinding the raw material to a predetermined size is provided below the heat treatment M3 and this heat treatment Fj13. A hopper 6 is connected to the supply feeder 5 attached to the coarse crusher 4, and defective products such as raw materials such as sintered pellets stored in the hopper are fed into the feeder 5. The raw material in a raw material storage can 8 suspended from a balance loader 7 placed at an appropriate position within the hood 1 is fed into the hopper 6 .

On the other hand, on the other side of the hood 1, a pulverizer 9 and a classifier 10 connected to the pulverizer 9 are installed. Further, a reversing machine 11 is provided above the fine grinding IM9, and by reversing an upwardly opening container 13 rotatably provided on the conveying device 12, the raw material contained in the container 13 is finely milled. It is designed to be sent to a crusher 9.

The above-mentioned conveyance device includes a plurality of guide rollers 14 and an endless conveyor body 15 supported by these guide rollers 14, and the endless conveyor body 15 includes a coarse crusher 4, a heat treatment machine 7, and a reversing machine 11.

That is, the endless conveyor 15 is a container 13 provided at intervals in the longitudinal direction, and receives the raw material coarsely pulverized by the coarse pulverizer 4, heat-treats the raw material with a heat treatment machine, and oxidizes the raw material. By inverting the container with the inverter 11, the oxidized raw material in the container is fed into the pulverizer 9.

Furthermore, feeders 16 and 17 are connected below the classifier 10, one feeder 16 receives product powder adjusted to a predetermined particle size, and the other feeder 17 receives product powder with a non-predetermined particle size. raw material powder is fed into each. A product 18 is placed at the end of the feeder 16, and a reservoir 19 is placed at the lower end of the feeder 17 to accommodate the powder fed through the feeder. The product 18 is placed on a 34 m machine 20 to measure the small m of product powder contained in the product 18.

Next, the effect will be explained.

The raw material storage can 8 containing defective nuclear fuel sintered pellets is lifted up by the balance loader 7 and turned over by appropriate means, and the raw material in the raw material storage can 8 is also stored in the hopper 6 .

A fixed amount of the raw material stored in the hopper 6 is sent to the coarse crushing rock 4 via the supply feeder 5, and is coarsely crushed into a predetermined size. The coarsely pulverized raw materials are transferred to a moving conveyor ￥Ft station 12.
The upper opening container 13 provided in the
It is sent to a heat treatment machine located downstream in the direction of travel, where it is oxidized.

The container 13 containing the oxidized raw material is sent to the reversing machine 11 by the conveyance device, and by reversing the container 13 here, the oxidized coarsely pulverized raw material in the container 13 is transferred to the lower part of the reversing machine 111. The powder is dropped into a pulverizer 9 installed at

The raw material sent to the pulverizer 9 is pulverized here and then sent to the classification IIO, where it is classified into raw materials with a predetermined particle size and raw materials with other particle sizes.
A total of ff1tffi20 product cans 18 through 6
The raw materials other than the predetermined particle size pass through the feeder 17 and are stored in the thin color 19.

On the other hand, since negative pressure is maintained inside the hood 1 via the canopy hood 2 connected to the exhaust duct, powder scattered from the coarse pulverizer 4 and the fine pulverizer 9 does not leak out of the hood.

Figure 3 is a graph showing the oxidized powder when the sintered pellet is oxidized as it is, and when the sintered pellet is roughly pulverized and then oxidized. This results in 100% oxidation treatment in half the oxidation time.

〔Effect of the invention〕

As described above, according to the present invention, since the sintered pellets are coarsely crushed before being oxidized, the oxidation time of the sintered pellets is considerably shortened compared to the conventional method. Since the finely pulverized raw material is classified, unoxidized coarse grains of the raw material are not mixed into the product, and furthermore, these operations can be performed continuously, resulting in good workability.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view of an oxidized powder manufacturing apparatus for sintered pellets according to the present invention, and FIG. 2 is a cross-sectional view of the same oxidized powder manufacturing apparatus.
FIG. 3 is a diagram showing the effect of coarse pulverization. 1...Food, 3...Heat fi Fl! Machine, 4...
Coarse pulverizer, 9... Fine pulverizer, 10... Classifier, 11
... Reversing machine, 12... Conveying device, 13... Container,
15... Endless conveyor. Applicant's agent Sato - Yu 1 Figure 22 Oxidation time (now) 100 times = 1)
Figure 3

Claims (1)

[Claims] A hood that maintains a negative pressure in the internal space, a heat treatment machine for oxidizing the raw material placed on one side of the hood, and a coarse grinding machine for coarsely pulverizing the raw material installed below the heat treatment machine. A pulverizer, an endless conveyance device arranged to pass through the coarse pulverizer and the heat treatment machine, a plurality of containers arranged reversibly at intervals in the running direction on the endless conveyance device, and the hood. A reversing machine is installed on the other side to reverse the traveling container, and a reversing machine is installed below the reversing machine to receive the coarsely crushed and oxidized raw material contained in the inverted container, and also to pulverize this raw material. An apparatus for producing sintered pellet oxide powder, which includes a pulverizer for pulverizing the pulverizer, and a feeding device for classifying and sending out the raw material pulverized by the pulverizer.