JPS5817668Y2 - flotation separation device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a pressurized flotation separation device for flotation concentration of slurry and the like.

Conventional pressurized flotation separation equipment has a structure in which the scum scraper disturbs the scum layer (for example, a flight type scraper), which makes it easy for air bubbles attached to floating materials to separate, making it difficult to concentrate the scum. The lack of air bubbles affected the scum concentration, and the quality of the separated water deteriorated due to the contamination of separated water with suspended matter separated from the air bubbles.

The present invention eliminates these conventional drawbacks, prevents disturbance of the scum layer and deterioration of the quality of separated water when scraping or scraping scum, improves the concentration of scum, and efficiently performs flotation separation of slurry. The purpose is to provide a device.

The present invention provides a flotation separation tank having an inflow pipe for a mixture of raw slurry and air-dissolved pressurized water at one end, and a scum discharge part and a separated water outflow pipe at the other end. It is characterized by having an endless running body on which scraping boards are installed.

To explain one embodiment of the present invention with reference to the drawings, a flotation tank 1 has a mixed liquid introduction pipe 2 of raw slurry and air-dissolved pressurized water at one end, and a scum pit 3 serving as a scum discharge section at the other end. A scraper 4 for removing water is rotatably provided, and a separated water outlet pipe 5 is provided.

On both sides of the inner wall of the tank 1, endless running bodies 7 each having a large number of scraping plates 6 planted thereon are disposed facing each other so as to be able to run between both sides of the scum layer 8.

This endless running body 7 has a structure that prevents scum from entering inside, and a large number of scraping plates 6 are planted on its side surfaces so that the upper end is above the scum layer and the lower end is located below the scum layer or above the water surface. The endless running body 7 moves in the direction of the arrow (direction of flow in the tank) to sandwich the scum and scrape it toward the scum discharge section. .

Further, a guide member 9 is attached to the lower part of the endless running body 7 to prevent scum from floating between the endless running body 7 and the side wall of the tank.

In addition, a partition wall 10 with an upper end below the water surface and a lower end separated from the bottom is provided near the mixed liquid introduction pipe 2 in the tank to divide it into a flotation chamber 11 and a separation chamber 12, so that the residence time of the scum is sufficient. In this case, the opening of the liquid mixture introduction pipe 2 is preferably opened between the upper end and the lower end of the partition wall 10.

In addition, instead of disposing the endless running bodies T on both sides of the inner wall of the tank, they may be combined with M members 9 and provided only on one side of the inner wall of the tank to transfer the scum to the scum discharge section.

The mixed liquid of the raw slurry and air-dissolved pressurized water is introduced from the introduction pipe 2 into the flotation chamber 11 in the tank 1, and the air bubbles generated by the opening and depressurization adhere to the floating substances and float to form the scum layer 8. The separated water is led out of the system from the lower part of the partition wall 10 through the separation chamber 12 and the outlet pipe 5.

The floating scum is scraped up by the movement of the endless traveling body I so that the scraping plates 6 come into contact with both sides of the scum layer 8 and sandwich the scum, and are scraped off by the scum scraper 4 and discharged to the scum pit 3. .

During this scraping, only both ends of the scum layer 80 come into contact with the scraping plate and are scraped together by the endless running bodies 7 disposed on both side walls moving at approximately the same speed, so most of the scum layer is scraped. The scum layer 8 is scraped up without coming into contact with the board, and the scum layer 8 remains undisturbed, with few bubbles separating (the scum scraper 4 efficiently discharges the scum to the scum pit 3).

As described above, according to the present invention, by deploying the endless running body with scraping plates planted on the inner wall side of the flotation tank,
Disturbance of the scum layer due to scum scraping can be prevented, and since air bubbles are less likely to separate from suspended matter, it prevents the quality of separated water from deteriorating, improves scum concentration, and performs efficient flotation separation. It is possible.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention, FIG. 2 is a plan view, and FIG. 3 is a sectional view taken along line A--A in FIG. 1...Flotation separation tank, 2...Mixed liquid introduction pipe, 4...Scraper, 5...Separated water outlet pipe, 6... ... scraping board, 7 ... endless running body, 8 ... scum layer, 9 ... guiding member,
10... Bulkhead.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) In a flotation separation tank having a mixed liquid inlet pipe of raw slurry and air-dissolved pressurized water at one end and a scum discharge part and a separated water outlet pipe at the other end, A flotation separation device equipped with an endless running body with a large number of scraping plates planted on at least one side. 2. Utility model registration claim 1, wherein the endless running body on which the scraping board is installed moves in the flow direction within the tank, and is arranged oppositely on both sides of the inner wall of the tank. equipment. 3. The device according to claim 1 or 2, wherein the endless running body is provided with a guiding member at a lower portion thereof for guiding the scum to the center of the tank or to one side. 4. The flotation separation tank is provided with a partition near the opening of the mixed liquid introduction pipe in the tank, the upper end of which is below the water surface, and the lower end of which is spaced apart from the bottom of the tank, claims 1 and 2. or the device described in paragraph 3. 5. The endless running bodies are disposed opposite to each other on both sides of the inner wall of the tank, and the scraping plates planted on each of the endless running bodies disposed oppositely are in contact with both sides of the scum layer. The apparatus according to claim 2, 3, or 4, which scrapes the scum layer between them. 6. Utility model registration claim 2, wherein the endless running bodies arranged opposite to each other on both sides of the inner wall of the tank are connected to a drive source so as to move at substantially the same speed.
The device according to paragraph 3, paragraph 4 or paragraph 5. 7. The apparatus according to claim 2, 3, 4, 5 or 6, wherein the scum discharge part of the flotation tank includes a rotary scraper for scraping off scum. .