JP2014227333A - Grain-coarsening method for water-granulated slag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide: a water granulation nozzle capable of easily performing grain-coarsening of water-granulated slag when the water-granulated slag is formed by subjecting molten slag to water granulation; and a grain-coarsening method for water-granulated slag using the water granulation nozzle.SOLUTION: A water granulation nozzle is configured to jet water-granulation water, which is used for making molten slag discharged from a metal smelting process into water-granulated slag, to the molten slag. A front surface part of the water granulation nozzle includes: approximately rectangular water-granulation water injection ports that further project than the front surface part of the water granulation nozzle and are respectively disposed on three stages; and a plurality of high-pressure water injection ports that are disposed below the water-granulation water injection ports and are communicated with the front surface part of the water granulation nozzle.

Description

  The present invention relates to a granulation nozzle suitable for granulating granulated slag and a granulating method for granulated slag.

The self-smelting furnace slag, which is a smelter when producing “kawa” in the self-smelting furnace, becomes granulated granulated slag by spraying water directly on the molten slag and rapidly solidifying it.
One method of using the granulated slag is to use sandblast as an abrasive. This is because coarse granulated slag is suitable for increasing the collision energy during blasting.

Regarding the coarsening of the molten slag, in Patent Document 1, a row provided with a plurality of water injection holes separated from each other in the flow width direction of the molten slag is divided into two or more rows in the upper and lower rows and adjacent to the upper and lower rows. There has been proposed a shower-shaped granulated slag production nozzle arranged so that projections in the vertical direction of the holes do not overlap.
However, if the water spray holes are to be secured to such nozzles so that the water granulation speed is constant and the top and bottom are not adjacent to each other, it is necessary to enlarge the body of the water spray nozzle by the interval between the adjacent spray holes. There is a problem that there is. Therefore, there is a problem that cannot be installed when there is a spatial restriction of the location where the water-split nozzle is installed.

Japanese Patent Laid-Open No. 2001-72448

  In view of such a situation, the present invention uses a granulated nozzle capable of easily granulating the granulated slag and the granulated nozzle when the molten slag is granulated to form the granulated slag. A method for coarsening granulated slag is provided.

  1st invention of this invention is the granulated water nozzle which spouts the granulated water which uses the molten slag discharged | emitted from the metal smelting process as granulated slag to the molten slag, Comprising: The front surface of the granulated nozzle The part is projected from the front part of the granulated water nozzle, and is provided with a three-tiered, roughly rectangular water spray nozzle, and a plurality of openings at the front part of the granulated nozzle below the water spray nozzle. A granulated water nozzle comprising a plurality of high-pressure water injection holes.

  According to a second aspect of the present invention, the granulated granulated slag is formed by granulating molten slag discharged from a smelting furnace with granulated water in a granulated slag to form coarse granulated slag. A method of producing a coarse granulated granulated slag by injecting granulated water into a molten slag in a granulated slag using the granulated nozzle according to the first invention. This is a method of coarsening slag.

  According to the water granulation nozzle of the present invention, it is possible to produce a granulated water granulated slag having a large particle size from molten slag easily and at a low cost.

It is a self-smelting furnace slag flow figure. It is a granulated nozzle shape schematic diagram in the present invention.

Hereinafter, the granulating method of the granulated slag using the granulated nozzle of the present invention and the granulated nozzle will be described.
FIG. 1 is a flow diagram of a self-smelting furnace slag. The self-smelting furnace slag (S ₁ ) separated by specific gravity by the self-smelting furnace 1 is discharged from the self-smelting furnace 1 and then passes through the smelting furnace 3 and then the smelting furnace slag (S ₃ ). As discharged.
This smelter furnace slag (S ₃ ) is ejected from the smelter can 4 in a molten slag state, and from a granulating nozzle 5 in which a jet outlet is installed under the slag of the smelter furnace slag (S ₃ ). It flows down towards the granulated water. 6 is a granulated slag that receives and discharges the granulated water after the granulation.
Due to the collision between the smelting furnace slag (S ₃ ) and the granulated water (the white arrow in FIG. 1), the molten slag is rapidly solidified and crushed to form a granulated slag.

FIG. 2 is an external perspective view of the granulating nozzle 5 of the present invention that ejects the granulated water.
From the front surface portion 12 of the water granulating nozzle 5, there are three heights of jetting ports 10 that are positioned to protrude from the front surface, and a plurality of high-pressure water jet holes 11 are provided below the jetting ports. The number and arrangement of the high-pressure water ejection holes are appropriately selected according to the amount of molten slag to be treated per unit time and the shape of the granulated slag that receives the formed granulated slag and granulated water.

A position projecting from the front face 12 of the granulated nozzle 5 by providing a spout water砕水, (Kansuragu S ₃ smelting in Figure ₁₎ the molten slag as shown in FIG. 2 flows, cans wrought located above When the molten slag flows down from the end of the ridge 4 and is granulated by the granulated water ejected from the granulation nozzle, the range where the granulated water hits the molten slag, that is, the ejection range of the granulated water converges. In combination with the arrangement of the jet outlets provided in three stages above and below, the molten slag is coarsened.
The protrusion height H from the front surface portion 12 only has to protrude from the front surface portion 12, and it falls from the positional relationship between the water granulation nozzle 5 and the end of the smelting cane 4 (discharging port for molten slag). It is good to select suitably so that the front-end | tip of the jet nozzle 10 may exist in the position which does not cover molten slag.

  When the granulated nozzle of the present invention is used, if the nozzle of the granulated water has one or two stages, the amount of the granulated water is reduced and the flow rate of the granulated water is decreased in order to coarsen the granulated slag. Then, the cooling effect by water decreases, and the molten slag accumulates on the granulated slag. As a result, there is a risk of causing a steam explosion. Is installed at the same position as in the prior art so that the outflow direction of the molten slag is parallel to the outflow direction of the granulated water. In addition, in order to cool the molten slag evenly with the granulated water, the direction of the granulating nozzle is set so that the amount of water flowing on the granulated basin receiving the granulated water becomes equal on the left and right.

By installing the water granulation nozzle in this way, the flow rate of the water for granulation can be reduced at the same amount of water, and the water granulation water outlet can adjust the amount of water for granulation as compared with the nozzle of one or two stages. The range in which the flow rate of water can be controlled is widened, and the risk of steam explosion can be greatly reduced.
However, in the present invention, if the amount of the granulated water is excessively reduced, there is a risk of a steam explosion as in the case of the one-stage or two-stage granulated nozzle.
Even if the granulated water spout is provided beyond three stages, the amount of granulated water from each spout is small, so the effect of slag coarsening is not much seen compared to the case of three stages. .

Hereinafter, the present invention will be described in detail by way of examples.
Granulated slag was formed under the conditions shown in Table 1 according to the flash furnace flow diagram shown in FIG.
Table 1 shows the particle size distribution and 50% particle size of the granulated slag, with Case 1 before using the water granulating nozzle of the present invention and Case 2 after using the water granulating nozzle of the present invention.
The particle size distribution was sieved using 2.36 mm, 1.18 mm, and 0.6 mm sieves. The 50% particle size was determined using a Rosin-Rammler diagram.

  From Table 1, the ratio of 0.6 mm to −1.18 mm is decreased and the ratio of +2.36 is increased in the case of Case 2 using the granulated nozzle of the present invention, compared with the case of Case 1. % Particle size increased. At this time, the amount of molten slag and the temperature of the granulated water, which are considered as other factors for coarsening the granulated slag particle size, were set to be substantially constant values.

  From the examples, it was shown that the granulated slag was coarsened by using the granulated nozzle of the present invention. This is because the flow velocity of the granulated water is slowed down, the impact energy when the molten slag collides with the granulated water is reduced, and the jet port of the granulated water is made into three stages, It can be estimated that the impact energy applied in the initial stage when the slag is cooled is a relaxed effect.

  As described above, the granulated slag coarsening method of the present invention can be easily performed without changing the production equipment of the granulated slag, and the existing one is simply changed and the risk of steam explosion. It is possible to reduce the particle size of the granulated slag according to the use application of the granulated slag.

DESCRIPTION OF SYMBOLS 1 Self-melting furnace 2 Self-melting furnace boiler 3 Refining furnace furnace 4 Smelting furnace furnace tank 5 Granulation nozzle 6 Granulation tank 10 Granulated water ejection port 11 High pressure water ejection hole 12 Front part (agriculture nozzle)
S ₁ flash furnace slag (molten slag)
S ₃ smelting Kang furnace slag (molten slag)

Claims (2)

A granulated water nozzle that ejects granulated water into the molten slag, using the molten slag discharged from the metal smelting process as the granulated slag,
In the front part of the granulated nozzle,
Protruding from the front surface of the water granulated water nozzle, a water spray port on a substantially rectangular shape provided in three stages,
A granulated water nozzle, comprising a plurality of high-pressure water ejection holes opened in the front surface of the granulated nozzle below the water granulated water ejection port. A granulated method of granulated slag in which molten slag discharged from a smelting furnace is granulated with granulated water in granulated slag to form coarse granulated slag,
Coarse granulated slag characterized by using the granulated nozzle according to claim 1 to produce granulated granulated slag by injecting granulated water into molten slag in the granulated slag. Method.

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