JPS5924396Y2 - Floss scraper in circular flotation thickener - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for scraping and removing floated floss during flotation concentration treatment of slurry or the like.

Conventionally, in the circular pressurized flotation concentration tank 1, the pipe-type skimmer 2 is not rotated in the circumferential direction to scrape off the floss; The amount of floss is large.

Therefore, when the gap 2 rotates from position A to B as shown in Figure 1, if the amount of floss scraped is adjusted to the center, the outer periphery will not be scraped enough and the floss layer will become thicker. Eventually, it will exceed its floating limit and sink back into the liquid.

Furthermore, if the amount of floss to be scraped is adjusted to the outer periphery, the center portion will be scraped more than necessary, and dilute sludge that is not sufficiently concentrated will be scraped off, resulting in an unfavorable result in the concentration process.

The purpose of this invention is to eliminate these inconveniences and provide a device that can uniformly and accurately scrape off highly concentrated floss, keep the floss layer stable, and facilitate the subsequent mechanical dewatering operation. It is.

That is, the present invention provides a circular flotation concentration tank rotatably equipped with a floss scraper that scrapes the floss floating on the water surface in the tank with a scraping plate, in which the scraping plate is arranged in two or more directions in the radial direction of the tank. This is a floss scraper for a circular flotation concentration tank, in which the number of the divided scrapers is increased from the center of the tank toward the outer periphery.

An embodiment of the present invention will be described with reference to FIGS. 2 and 3. An inlet 3 is opened near the water surface of the tank 1 in the direction of scraping floating sludge, etc. Notch opening 5
An inner cylinder 6 with an open opening is provided concentrically, and a sludge transfer mechanism, for example, a screw blade 7 (or an endless running belt) is disposed within the inner cylinder 6.

Further, the space between the inner and outer cylinders is divided into two or more parts (in this embodiment, three parts) at least in the longitudinal direction, that is, in the radial direction of the tank 1, and between the inner and outer cylinders of the divided part there is a scraping plate made of a flat plate of a bottom plate extending approximately radially. Scraping plates 8 are installed on an annular member 9 that rotates outside the inner cylinder 6 so that the number of scraping plates 8 increases from the center of the tank 1 toward the outer periphery, and the tip of this scraping plate 8 always rotates near the inner surface of the outer cylinder 4. The floating sludge introduced from the inlet 3 is successively scraped up by the rotation of the scraping plate 8 between the inner and outer cylinders and falls into the notch 5, and the inside of the inner cylinder 6 is moved by the screw blades. 7, the floss is discharged to a launder 10 or a discharge gutter (not shown) on the opposite side.

In addition, in the example shown in the fourth figure, the shape of the scraping plate 8 is a curved plate to facilitate scraping up of sludge, etc., and a concave portion is located in the rotation direction.

In the fifth illustrated example, the scraping plate 8 is of a packet type.

In addition, the inlet 3 for floating sludge, etc. is connected to the outer cylinder 4 as shown in the second illustrated example.
Although it is possible to cut out only a part of the sludge, floating sludge can be effectively scraped if the guide plate 11 is connected to the lower part of the inlet 1 in the scraping direction almost parallel to the water surface as shown in the fourth and fifth illustrations. You can take it.

Furthermore, it is also possible to rotatably provide both end plates in the outer cylinder 4 and attach the scraping plates 8 to these so as to rotate between the inner and outer cylinders.

Furthermore, instead of rotating the inner cylinder or the scraping plate attachment shaft fitted to the inner cylinder 6, the outer cylinder 4 side may be made into a double cylinder and the inner cylinder may be rotated.

The floss floating on the water surface can be scraped off by moving the skimmer 2 in the circumferential direction of the tank 1, but as shown in FIG. Since the amount of floss taken in is appropriately gradually increased from the center toward the outer periphery, a uniform concentration of floss can be accurately scraped from the inlet 3 without protruding from the water surface.

Here, we will discuss a specific example of setting the number of scraping plates 8 to be installed.
To explain according to the drawings and Fig. 7, in Fig. 6, tank 1
When the floss scraping area (area of the annular water surface) at the center, middle, and outer circumference of is S1, S2°S3, respectively, the number of installed scraping plates 8 divided corresponding to each of the above parts is N1. N
2. The ratio of N3 may be made equal to these area ratios.

For example, Sl, S2. S3 is 40m2.60m2 each
．． When it is 80m2, N1°N2. N3 will be 4, 6, and 8, respectively.

In the example shown in this sixth figure, a packet type one is used as the scraping plate 8, and lines I■-II and III in FIG.
The cross-sections taken along lines -III and IV-IV are shown in Figures 7a, l) and c, respectively.

As described above, according to the present invention, the amount of scraped floss can be adjusted to an appropriate value both in the center and the outer periphery of the circular pressurized flotation concentration tank, without scraping off low-concentration floss.
It becomes possible to efficiently scrape off a uniform and highly concentrated froth, the floss layer can be kept stable, and since the solid matter recovery rate is high, the dehydration operation of the froth in the next step can also be improved.

[Brief explanation of the drawing]

Fig. 1 is a plan view of a conventional pressurized flotation concentration tank, Fig. 2 is a vertical sectional view showing an embodiment of the present invention, Fig. 3 is a sectional view taken along line I-I in Fig. 2, Fig. 4, Fig. 5 is a sectional view showing other embodiments of the scraping plate, Fig. 6 is a plan view showing how to set the number of scraping plates to be installed, and Fig. 7 a, l), and c are Fig. 6, respectively. No I■-II line, ■II-III line, IV-
It is a sectional view taken along the IV line. 1... Tank, 2... Clearance, 3...
...Introduction port, 4...Outer tube, 5...Notch, 6...Inner tube, 7...Screw blade, 8... ...Scraping plate, 9...Annular member.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A circular flotation concentration tank equipped with a rotatable floss scraper that scrapes floss floating on the water surface in the tank with a scraping plate,
Floss scraping in a circular flotation concentration tank, in which the scraping plate is divided into two or more in the radial direction of the tank, and the number of the divided scraping plates increases from the center of the tank to the outer periphery. Take machine. 2. The floss scraper is provided concentrically with a movable outer cylinder having an inlet opening in the direction of scraping the floss floating on the water surface, and an inner cylinder having a cutout opening in the outer cylinder, and A floss transfer mechanism is disposed inside, and the scraping plate is rotatably arranged between the inner and outer cylinders, and the space between the inner and outer cylinders is divided into two or more in the radial direction of the tank, 2. The scraping machine according to claim 1, wherein the number of scraping plates installed between the inner and outer cylinders increases from the center of the tank toward the outer periphery.