Continuous particle manufacturing device

1. A continuous particle manufacturing apparatus, which includes a processing container, a processing gas introducing section configured to introduce a processing gas into the processing container, and a spray nozzle arranged in the processing container and configured to spray one processing solution selected from a raw material solution containing raw material powder, a binder solution, and a coating solution, and is configured to perform a granulation process or a coating process in such a manner that dried particles of the raw material powder produced continuously or intermittently by drying the raw material solution sprayed from the spray nozzle in the processing container, or particles of the raw material powder loaded continuously or intermittently into the processing container are brought into contact with the processing solution sprayed from the spray nozzle while the dried particles of the raw material powder or the particles of the raw material powder are fluidized by the processing gas, and then to continuously or intermittently discharge processed particles that undergo the granulation process or the coating process,

the continuous particle manufacturing apparatus comprising:

a particle drawing section configured to draw the particles out of the processing container;

a sorting section configured to sort the particles drawn by the particle drawing section into the processed particles and unprocessed particles;

a discharge section to which the processed particles sorted out by the sorting section are discharged; and

a particle returning section configured to return, into the processing container, the unprocessed particles sorted out by the sorting section, the particle returning section being configured to blow the unprocessed particles toward an inner wall surface of the processing container together with an air stream,

wherein the particle drawing section comprises a suction nozzle connected to the sorting section through a suction unit, so that the suction nozzle sucks the processed particles and the unprocessed particles from the processing container to transfer the processed particles and the unprocessed particles to the sorting section.

2. The continuous particle manufacturing apparatus according to claim 1 , wherein the particle returning section comprises an ejection nozzle configured to eject an air stream containing the unprocessed particles toward the inner wall surface of the processing container in a tangential direction or in an up-and-down direction of the processing container.

3. The continuous particle manufacturing apparatus according to claim 1 , wherein the sorting section comprises a classification mechanism configured to sort the particles drawn by the particle drawing section into the processed particles and the unprocessed particles by a classification air stream.

4. The continuous particle manufacturing apparatus according to claim 3 ,

wherein the sorting section further comprises a cyclone mechanism, and

wherein the classification mechanism is connected to the particle drawing section and the particle returning section through the cyclone mechanism.

5. The continuous particle manufacturing apparatus according to claim 3 ,

wherein the sorting section further comprises a bypass passage connected to an upper portion of the classification mechanism, and a second particle returning section being communicable to the bypass passage, and

wherein, under a state in which the bypass passage and the second particle returning section communicate with each other, the classification air stream and a part of the unprocessed particles are returned into the processing container through the bypass passage and the second particle returning section.

6. The continuous particle manufacturing apparatus according to claim 5 ,

wherein the bypass passage is connected through a switching valve to the second particle returning section and a discharge passage linked to the discharge section,

wherein the switching valve is capable of switching communication of the bypass passage to the second particle returning section and the discharge passage between a state in which the bypass passage and the second particle returning section communicate with each other, and a state in which the bypass passage and the discharge passage communicate with each other,

wherein the upper portion of the classification mechanism is configured to be openable and closable by an on-off valve at a position above the bypass passage, and

wherein, under a state in which the bypass passage and the discharge passage communicate with each other by the switching valve and the upper portion of the classification mechanism is closed by the on-off valve, a discharge air stream stronger than the classification air stream is introduced into the classification mechanism, and the processed particles that remain in the classification mechanism are discharged by the discharge air stream to the discharge section through the bypass passage and the discharge passage.

7. The continuous particle manufacturing apparatus according to claim 1 , further comprising a gas jet nozzle, which is installed on a wall portion of the processing container, and is configured to jet a gas so as to form a swirl stream that flows along the inner wall surface of the processing container in a circumferential direction of the processing container.

8. The continuous particle manufacturing apparatus according to claim 1 , further comprising an impeller, which comprises an agitation blade, and is installed at a bottom of the processing container.

9. The continuous particle manufacturing apparatus according to claim 1 , wherein

the particle returning section comprises an ejection nozzle configured to eject the air stream containing the unprocessed particles toward the inner wall surface of the processing container in a tangential direction of the processing container,

the suction nozzle is configured to suck the processed particles and the unprocessed particles from the processing container along a tangential direction of the processing container, and

a suction force generated by the suction nozzle and an ejection force generated by the ejection nozzle act in a same peripheral direction of the processing container.