JPS5925451Y2 - Overflow device for granulated slag dewatering machine - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an overflow device for a granulated slag dehydrator.

Granulated slag grains are effectively used as cement aggregate, artificial jewelry, etc. High-temperature slag that is intermittently discharged from blast furnaces, etc. is rapidly cooled by water injection, and then the granulated slag grains are dehydrated and dried from the resulting slurry. It is manufactured through a process of

A dehydrator used to separate and dewater granulated slag particles from granulated slag slurry has a water tank that receives the granulated slag slurry that is produced intermittently each time.

This water tank also has an overflow device that discharges the received slurry water while separating granulated slag particles mixed in the slurry water.

Conventional overflow devices simply provide a flat weir plate at the upper end of the side wall of a water tank, and form a drainage channel on the outside of this weir plate to receive overflow water and send it to subsequent equipment.

Granulated slag particles in slurry water are effectively separated when their settling rate is greater than the rising rate of slurry water in the tank, but if their settling rate is lower or they float, they are separated into slurry water. The mixed water overflows over the weir board and is sent to downstream equipment.

If there is a large amount of granulated slag particles mixed in the overflow water,
Not only does this reduce product yield, but it also causes many problems in terms of post-equipment management.

On the other hand, granulated slag slurry is intermittently supplied to the water tank.
Moreover, since the amount is not constant, the amount of water discharged by the overflow device is also not constant.

Therefore, in conventional overflow devices that overflow and drain slurry water using a simple flat weir plate, it is difficult to increase the length of the overflow area, so the overflow speed is limited. It will often increase.

As the overflow speed increases, the rising speed of the slurry water in the water tank also increases.

Therefore, the overflow amount of granulated slag particles suspended in the slurry water increases, resulting in the above-mentioned problems.

The present invention has been developed in view of the above, and according to the present invention, even if the amount of slurry water in the water tank increases, the overflow velocity of the slurry water does not increase, and as a result, the amount of granulated slurry particles increases. The overflow rate can be suppressed to a small level and the separation efficiency can be improved.

Embodiments of the present invention will be described below with reference to FIGS. 1 to 5.

Reference numeral 1 denotes a rotary dehydrator, which includes a water tank 2, a rotating body 4 fixed to a horizontal shaft 3, and overflow devices 5 provided on both left and right sides of the rotating body 4.

Granulated slag slurry is supplied into the water tank 2 from a granulated slag slurry supply cylinder 6 attached to one end thereof.

In the water tank 2, granulated slag particles S settle and accumulate at the bottom.
This is scraped off by the rotation of the rotating body 4 in the direction of the arrow X in the figure, and then dehydrated and thrown into the granulated slag particle discharge chute 7 attached to the other end of the water tank 2, and further carried out by the belt conveyor 8. be done.

That is, the rotating body 4 is provided with a large number of partition walls 10 at required pitches in the circumferential direction between the pair of left and right side plates 9.
A passage 11 extending from the outer periphery toward the inside is formed between these partition walls 10, and the passage 11
A bag-shaped filter 12 is provided inside.

Due to the rotation of the rotating body 4, the granulated slag particles S accumulated at the bottom of the water tank 2 are scraped into the inside of the filter 12 and then transferred to the upper part. As the rotating body 4 rotates after being pulled up from W, the volume of the slurry above the water surface in the passage 11 gradually increases, so that effective dewatering is performed.

The overflow device 5 includes a flat weir plate 14 provided at the upper end of the water tank side wall 2A over almost the entire length thereof, a water collection gutter 15 provided on the outside of this weir board 14, and a water collection gutter 15 of the water tank 2. It has a partition plate 16 provided inside to face the weir plate 14, and a large number of parallel overflow gutters 17 provided between this partition plate 16 and the weir plate 14.

As best shown in FIG.
is divided into upper and lower parts, an upper partition plate 16A and a lower partition plate 16A.
B are each fixedly supported by the structural member 18.

As shown in FIG. 3, a detour 19 for slurry water is formed between the lower end of the lower partition plate 16B and the tank bottom plate 2B.

A large number of overflow gutters 17 are provided in parallel at equal pitches, and in this case, the tip of each overflow gutter 17 is formed in the weir plate 14 and fitted into the notch hole 20 in a watertight manner. be done.

In this case, the upper edge of the side wall 17A of the overflow gutter 17 is set at the same level as the upper edge of the weir plate 14.

Moreover, the bottom wall 17B of the overflow gutter 17 is inclined.

In the illustrated example, the overflow gutter 17 is shown to have a square cross section, but other shapes such as a square shape, a semicircular shape, etc. may be similarly adopted.

The granulated slag slurry from the granulated slurry supply cylinder 6 is supplied between the pair of left and right lower partition plates 16B, and the granulated slag particles S are deposited at the bottom of the water tank between the partition plates 16B.

On the other hand, the slurry water rises in the ice tank 2 through the detour 19 together with the granulated slag particles mixed therein in a suspended state, and overflows into the overflow device 5 according to the amount of the slurry water.

When the slurry water rises in the water tank 2 after passing through the detour 19, some of the granulated slag particles settle, and the granulated slag particles S
It is deposited together with

The remaining granulated slag particles are separated immediately before the slurry water overflows into the overflow device 5, and are deposited at the bottom of the water tank.

That is, since overflow is performed via the weir plate 14 and each pair of side walls 17A of the large number of overflow gutters 17, the total length of the overflow area becomes very long.

Therefore, the overflow amount and overflow speed per unit time in each part of the overflow area become extremely small, and as a result, the amount of granulated slag particles accompanying this is extremely reduced.

In addition, since the slurry water surface is suppressed by the overflow gutter bottom wall 17B, overflow of particles is thereby prevented.

FIG. 6 is an explanatory diagram for comparing the length of the overflow area between the conventional overflow device and the overflow device according to the present invention.

As is clear from this figure, in the conventional overflow device a, the total length of the overflow area is only the length of the weir plate 14, whereas in the overflow device of the present invention, each overflow gutter 17 The length is 11, the interval is 12, and the interval between the overflow gutter 17 at the end and the water tank wall 21 is 13.
Then, the total length of the overflow area is 2n1, +(n -1)
l 2 + 2 l 3 (where n is the number of overflow gutters 17), and the total length of the overflow area can be easily increased.

As is clear from the above explanation, according to the present invention, it is possible to form a much longer overflow area compared to conventional overflow devices, so the overflow volume and overflow speed per unit time in each part of the overflow area can be reduced. can do.

Therefore, the amount of granulated slag particles accompanying slurry water can be almost completely eliminated, leading to improved product yield and protection of downstream equipment.

Further, it is possible to sufficiently cope with fluctuations in the amount of granulated slurry that is intermittently supplied to the water tank.

[Brief explanation of drawings]

1 to 5 show an embodiment of the present invention, in which FIG. 1 is a vertical side view, FIG. 2 is a cross-sectional plan view, and FIG. 3 is an enlarged cross-sectional view taken along line A-A in FIG. FIG. 4 is an enlarged perspective view of the main part of the overflow device 5, and FIG. 5 is an enlarged vertical sectional front view of the main part. FIGS. 6a and 6l) are explanatory diagrams. 1...Rotating dehydrator, 2...Water tank, 5.
...Overflow device, 14...Weir board, 16...
... Water collection gutter, 16 ... Partition plate, 17 ...
...overflow gutter, 19... detour.

Claims (1)

[Scope of utility model registration request] The granulated slag dewatering machine drains and discharges the granulated slag particles of the granulated slag slurry supplied into the tank, and also overflows the slurry water through a weir plate to separate the granulated slag particles mixed in the slurry water. The overflow device is provided with a partition plate in the tank that faces the weir plate and forms a slurry water detour between the tank bottom wall, and a partition plate that extends between the partition plate and the weir plate. An overflow device for a granulated slag dewatering machine, characterized in that an overflow gutter is provided which leads to the outside of the tank, and the upper edge of the side wall of the overflow gutter is set at the same level as the upper edge of the weir plate.