JPS607829Y2 - flotation concentrator - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a flotation concentration device that efficiently scrapes and removes floated floss during flotation concentration processing with slurry.

Conventionally, in circular pressurized flotation thickeners, floss is scraped off by rotating a pipe-type skimmer in the circumferential direction.
The slurry to be floated and concentrated is supplied from the center of the tank, and the separated water flows out from the outer periphery of the tank, so the floss that floats due to the water flow tends to collect at the outer periphery of the tank, and as a result, the thickness of the floss layer increases. The floss is thinner at the center of the tank and becomes thicker as it moves away from the center toward the outer periphery, and the amount of floss is larger at the outer periphery than at the center.

Therefore, when the clearance rotates, 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 and thicker, eventually exceeding the floating limit and settling back into the liquid. It turns out.

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

The purpose of the present invention is to provide a device that eliminates these inconveniences, scrapes off highly concentrated floss uniformly and accurately, keeps the floss layer stable, and facilitates the subsequent mechanical dewatering operation. be.

This invention has an inflow pipe for a mixture of slurry and gas-dissolved pressurized water in the center of the circular flotation concentration tank, and a separated water outflow pipe on the outer peripheral wall of the tank. In a flotation concentration device in which a scraper is rotatably provided on the outer circumferential side of the tank, the floss scraper has a movable outer circumference with an inlet opening in the direction of scraping the floss floating on the water surface, and A floss transfer mechanism such as a screw conveyor is arranged inside the inner cylinder, and a scraping plate is rotated between the inner and outer cylinders. This is a flotation concentration device that can be deployed.

To explain one embodiment of the present invention with reference to the drawings, a circular bulkhead 2 is disposed near the center of a circular flotation concentration tank 1 with an upper end protruding above the water surface and a lower end reaching the bottom of the tank. A mixed liquid inflow pipe 3 of raw slurry and air-dissolved pressurized water is connected to I to open toward the outer peripheral wall of the tank 1, and a partition wall 2 is connected to the outer peripheral wall of the tank 1.
A partition wall 4 whose upper end protrudes above the water surface and whose lower end is spaced apart from the tank bottom is disposed in the flotation concentration section H between the tank 1 and the separated water outflow section 7 between the partition wall 4 and the outer peripheral wall of the tank 1. A separated water outflow pipe 5 is open-connected to the separated water outflow portion 7.

In addition, in the flotation concentrating section (2), a floss scraping machine 6 is supported on the outer peripheral wall and has a shape in which the central part of the tank is cut off so as to scrape only the floss on the outer periphery. It is installed facing the direction.

The length of this floss scraper 6 is 172 mm (tank diameter).

114) The following is preferable, and the inner cylinder 6' has an inlet opening near the water surface in the direction of scraping floating sludge, etc., and an inner cylinder 6' with a notch opening upward inside the outer cylinder that moves above the water surface. A sludge transfer mechanism, such as a screw blade of a screw conveyor, is disposed within the inner cylinder 6'.

Further, between the inner and outer cylinders, a scraping plate consisting of a flat plate of a bottom plate is installed almost radially on an annular member that rotates outside the inner cylinder, and the tip of this scraping plate is arranged so that it always rotates near the inner surface of the outer cylinder. The floating sludge, etc. introduced from the inlet is successively scraped up by the rotation of the scraping plate between the inside and outside, falls into the notch, and is discharged into the floss discharge roller by the screw blade inside the inner cylinder. It has become so.

In the figure, 8 is a baffle plate, 9 is a floss discharge roller, 10 is a floss discharge pipe, and 11 is a rotating aggregate that supports a floss scraper and is used to form a running trolley equipped with wheels, etc. A portion of the outer circumferential wall may be configured to be freely pivotable, and a floss scraper 6 may be provided thereto to make it pivotable.

12 is a liquid supply valve, and 13 is a guide roller.

Further, when a scraper rotated by a drive device is provided in the center of the tank, the floss scraper 6 can be attached to this rotating shaft to enable rotation.

By rotating the floss scraper in the circumferential direction of the ellipse, the floss that has floated to the surface of the water can be scraped off only at the thicker floss layer at the outer periphery, without spilling over the water surface. The floss can be accurately scraped from the inlet and led out to the floss discharge long-9 without any waste.

As described above, according to the present invention, it is possible to efficiently scrape off uniformly high-concentration floss without scraping off low-concentration floss, and the floss layer can be kept stable.
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 drawings]

The drawing is a longitudinal sectional view of a pressurized flotation concentration tank. DESCRIPTION OF SYMBOLS 1... Circular floating concentration tank, 2... Annular partition, 3... Mixed liquid inflow pipe, 4... Partition wall, 5... Separated water outflow pipe, 6...Floss scraper, 7...Separated water outflow section, 8...
Baffle plate, 9...Floss discharge lonter, 10
... Floss discharge pipe, 11 ... Rotating aggregate that supports the floss scraper, 12 ... Liquid supply valve, 13 ... Guide roller .

Claims (1)

[Scope of Claim for Utility Model Registration] 1. An inlet pipe for a mixture of slurry and gas-dissolved pressurized water is provided in the center of the circular flotation concentration tank, and a separated water outflow pipe is provided on the outer peripheral wall of the tank, and the tank floats on the water surface. In a flotation concentration device in which a floss scraper for scraping floss is rotatably provided on the outer peripheral side of the tank, the floss scraper has a movable outer periphery with an inlet opening in the direction of scraping the floss floating on the water surface. , an inner cylinder having a notch opening at the upper part is provided concentrically within the outer cylinder, and a floss transfer mechanism such as a screw conveyor is disposed within the inner cylinder, and a floss transfer mechanism such as a screw conveyor is provided between the inner and outer cylinders. A flotation concentration device with a rotatable scraping plate. 2. The apparatus according to claim 1, wherein the length of the floss scraper is 1/2 or less of the tank radius R. 3. Utility model registration claim 1, wherein the floss scraper is supported on the outer peripheral wall of the tank and is rotatably provided.
The device according to paragraph 2 or paragraph 2.