WO2009116675A1 - 溶融スラグの冷却処理装置および冷却処理方法 - Google Patents
溶融スラグの冷却処理装置および冷却処理方法 Download PDFInfo
- Publication number
- WO2009116675A1 WO2009116675A1 PCT/JP2009/055723 JP2009055723W WO2009116675A1 WO 2009116675 A1 WO2009116675 A1 WO 2009116675A1 JP 2009055723 W JP2009055723 W JP 2009055723W WO 2009116675 A1 WO2009116675 A1 WO 2009116675A1
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- Prior art keywords
- cooling
- slag
- drum
- molten slag
- molten
- Prior art date
Links
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J1/00—Removing ash, clinker, or slag from combustion chambers
- F23J1/08—Liquid slag removal
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B5/00—Treatment of metallurgical slag ; Artificial stone from molten metallurgical slag
- C04B5/06—Ingredients, other than water, added to the molten slag or to the granulating medium or before remelting; Treatment with gases or gas generating compounds, e.g. to obtain porous slag
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/02—Physical or chemical treatment of slags
- C21B2400/022—Methods of cooling or quenching molten slag
- C21B2400/026—Methods of cooling or quenching molten slag using air, inert gases or removable conductive bodies
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/04—Specific shape of slag after cooling
- C21B2400/042—Sheets
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/05—Apparatus features
- C21B2400/052—Apparatus features including rotating parts
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/05—Apparatus features
- C21B2400/052—Apparatus features including rotating parts
- C21B2400/056—Drums whereby slag is poured on or in between
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/08—Treatment of slags originating from iron or steel processes with energy recovery
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2900/00—Special arrangements for conducting or purifying combustion fumes; Treatment of fumes or ashes
- F23J2900/01002—Cooling of ashes from the combustion chamber by indirect heat exchangers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2900/00—Special arrangements for conducting or purifying combustion fumes; Treatment of fumes or ashes
- F23J2900/01003—Ash crushing means associated with ash removal means
Definitions
- the present invention relates to a cooling drum type molten slag cooling processing apparatus, and a molten slag cooling processing method using this apparatus, and a manufacturing method of a hot slag product.
- molten slag for example, steelmaking slag
- a method of pouring water by pouring into an iron container called the pan cooling method may be used.
- a twin-drum type slag cooling device is known as a device for cooling molten slag such as blast furnace slag waste incineration ash molten slag (for example, Patent No.
- This slag cooling processing apparatus includes a pair of cooling drums arranged in parallel in the horizontal direction and having a rotation direction in which opposite outer peripheral portions rotate upward, and an upper portion between the upper outer peripheral surfaces of the pair of cooling drums.
- Molten slag is supplied from, and a slag liquid reservoir is formed.
- the molten slag is taken out from the slag liquid pool by adhering and solidifying to the surface of the rotating cooling drum, and this molten slag is cooled to an appropriate solidified state while adhering to the cooling drum surface.
- At the rotating position it is peeled off from the surface of the cooling drum by its own weight and collected by the collecting means.
- the processed slag is discharged from each pair of cooling drums in the opposite direction, so there are two paths for discharging the cooled slag. It is necessary, and a large site area is required. For this reason, removal of the cooled slag, post-treatment, and heat recovery are complicated and inefficient, and the equipment cost also increases.
- the slag cooled by the cooling drum type cooling processing apparatus still has considerable sensible heat. Therefore, if slag sensible heat is collected as much as possible from the viewpoint of effective use of energy, the slag is cooled. It is important to further recover heat from the treated slag.
- the two paths are combined into one. The slag temperature decreases during the transport process, and efficient heat recovery cannot be performed. This is a serious problem especially when a large amount of molten slag is processed.
- a large amount of molten slag is processed using a large twin-drum slag cooling device (for example, slag processing rate: 1 t / min or more)
- the molten slag is poured from the slag pan to the cooling drum.
- the cooling drum may be worn out by the load of the molten slag falling.
- it is necessary to install a tundish above the cooling drum transfer the molten slag from the slag pan to the tundish, and then pour hot water from this tundish to the cooling drum.
- tundish when used for pouring molten slag, unlike molten metal, the slag solidifies and adheres to the pouring port, making it impossible to perform pouring properly.
- the amount of sludge remaining in the tundish also increases, and problems such as clogging of the pouring gate and pulverization of residual slag can be avoided.
- it is necessary to install a tundish heater which causes problems such as reduced energy efficiency and increased processing costs.
- the conventional twin-drum type slag cooling apparatus has the following problems.
- slag with high basicity (especially basicity ⁇ 3) is powdery, and such slag can be made difficult to powder by quenching from the molten state.
- the thickness cannot be reduced due to the high viscosity, and a sufficient cooling rate cannot be obtained, so that pulverization after cooling cannot be appropriately suppressed.
- the object of the present invention is to provide a slag product manufacturing apparatus that can solve the problems of the conventional technology, handle slag that has been subjected to the cooling process, can be easily post-processed, and can reduce equipment costs.
- the object of the present invention is to provide a cooling slag type cooling slag cooling processing apparatus capable of processing a large amount of the slag.
- Another object of the present invention is to efficiently cool a molten slag having a relatively high basicity and viscosity, and a slag that is not easily pulverized even with a slag having a particularly high basicity.
- An object of the present invention is to provide a molten slag cooling apparatus capable of obtaining a solidified body.
- Another object of the present invention is to produce a thick-walled slag solidified body suitable for obtaining a slag product such as coarse aggregate when processing a molten slag having a relatively low viscosity.
- An object of the present invention is to provide a molten slag cooling apparatus capable of performing
- Another object of the present invention is to provide a method for cooling molten slag using the above cooling processing apparatus.
- Another object of the present invention is to provide a method for manufacturing a slag product using such a cooling method. Disclosure of the invention
- the gist of the present invention for solving the above problems is as follows.
- a single rotatable horizontal cooling drum (1) that cools by adhering molten slag to the outer drum surface (100), and supplying molten slag to the horizontal cooling drum (1) ), And the slag adhered to the drum surface (100) and cooled is peeled off from the drum surface (100) and discharged in one direction as the horizontal cooling drum (1) rotates.
- An apparatus for cooling molten slag characterized by the above.
- the heel (2) is provided so that its tip is in contact with or close to the drum surface (100) of the horizontal cooling drum (1).
- An apparatus for cooling molten slag which is directly supplied to the drum surface (100) from the tip of the ridge (2) and adheres to the drum surface (100).
- ⁇ (2) is provided such that the tip thereof is in contact with or close to the drum surface (100) of the horizontal cooling drum (1), ⁇ (2) and the drum surface (100) form a slag liquid reservoir (A).
- a molten slag cooling device characterized by being attached to and taken out.
- the molten slag adhering to the drum surface (100) of the horizontal cooling drum (1) is rolled and expanded in the drum width direction.
- a molten slag cooling apparatus characterized by having a stretch roll (3).
- the heel (2) is provided so that the tip thereof is in contact with or close to the drum surface (100) of the horizontal cooling drum (1), and the horizontal cooling drum A dam (4) is provided above (1), and the slag liquid reservoir (A) is formed by the dam (4), drum surface (100), and ridge (2), and the weir (4) and the horizontal cooling drum
- a molten slag cooling apparatus characterized by having an opening (5) between which the molten slag in the slag liquid reservoir (A) is extruded.
- the weir (4) is composed of a cooling drum (4x) having a force S and a lower outer peripheral surface rotating in the direction of the anti-slag liquid reservoir (A).
- a method for cooling a molten slag comprising: using the cooling apparatus according to any one of [1] to [8] above; and cooling the molten slag.
- the molten slag in the slag liquid reservoir (A) is extruded discontinuously from the opening (5).
- FIG. 1 is a front view schematically showing an embodiment of a cooling slag cooling apparatus and cooling method according to the present invention.
- FIG. 2 is a front view schematically showing another embodiment of the cooling treatment apparatus and the cooling treatment method for molten slag according to the present invention.
- FIG. 3 is a front view schematically showing another embodiment of the molten slag cooling apparatus and cooling method according to the present invention.
- FIG. 4 is a front view schematically showing another embodiment of the molten slag cooling apparatus and cooling method according to the present invention.
- FIG. 5 is a plan view of the embodiment shown in FIG.
- FIG. 6 is an explanatory view showing the action of the extending roll attached to the cooling drum of the embodiment shown in FIG.
- FIG. 7 is a plan view schematically showing another embodiment of the cooling slag cooling apparatus and cooling method according to the present invention.
- FIG. 8 is a front view schematically showing another embodiment of the molten slag cooling processing apparatus and cooling processing method according to the present invention.
- FIG. 9 is a front view schematically showing another embodiment of the molten slag cooling apparatus and cooling method according to the present invention.
- FIG. 10 is a front view schematically showing a part of another embodiment of the molten slag cooling processing apparatus and cooling processing method according to the present invention.
- FIG. 11 is a side view schematically showing a part of the embodiment shown in FIG.
- FIG. 12 is a front view schematically showing a part of another embodiment of the molten slag cooling apparatus and the cooling method according to the present invention.
- FIG. 13 is a side view schematically showing a part of the embodiment shown in FIG.
- FIG. 14 is a front view schematically showing a part of another embodiment of the molten slag cooling processing apparatus and cooling processing method according to the present invention.
- FIG. 15 is a side view schematically showing a part of the embodiment shown in FIG.
- FIG. 16 is a front view schematically showing a part of another embodiment of the molten slag cooling device and the cooling method according to the present invention.
- FIG. 17 is a side view schematically showing a part of the embodiment shown in FIG.
- FIG. 18 is a front view schematically showing a part of another embodiment of the molten slag cooling processing apparatus and cooling processing method according to the present invention.
- FIG. 19 is a side view schematically showing a part of the embodiment shown in FIG.
- FIG. 20 is a front view schematically showing another embodiment of the molten slag cooling apparatus and cooling method according to the present invention.
- FIG. 21 is a front view schematically showing another embodiment of the molten slag cooling processing apparatus and cooling method according to the present invention.
- FIG. 22 is a front view schematically showing another embodiment of the molten slag cooling processing apparatus and cooling processing method according to the present invention.
- FIG. 23 is a front view schematically showing another embodiment of the molten slag cooling apparatus and cooling method according to the present invention.
- FIG. 24 is a front view schematically showing another embodiment of the molten slag cooling processing apparatus and cooling method according to the present invention.
- FIG. 25 is a schematic cross-sectional view showing an embodiment of an internal cooling mechanism applied to the spreader shown in FIGS.
- FIG. 26 is a graph showing the relationship between the number of rotations of the cooling drum and the slag processing amount of the apparatus of the present invention. ⁇ Explanation of sign>
- slag to be cooled
- steelmaking slag for example, converter decarburization slag, dephosphorization slag, Desiliconization slag, desulfurization slag, electric furnace slag, forging slag, etc.
- smelting reduction slag eg, slag generated by melting reduction of iron ore, Cr ore, Ni ore, Mn ore, etc.
- other iron making Various types of slag can be targeted, such as slag generated from a smelting furnace, waste incineration ash melting slag, and waste gasification melting slag.
- FIG. 1 is a front view schematically showing one embodiment of the molten slag cooling processing apparatus and cooling method according to the present invention.
- This molten slag cooling processing apparatus cools by attaching molten slag to the outer drum surface 100, and a single rotatable horizontal cooling drum 1 (hereinafter simply referred to as “cooling drum 1”. The same applies to the embodiment), and the cooling drum 1 is provided with a trough 2 for supplying molten slag.
- the “horizontal type” of the horizontal cooling drum means that the rotation axis of the drum is substantially horizontal.
- the rod 2 is arranged on one side in the radial direction of the cooling drum, and supplies molten slag S to the upper drum surface of the cooling drum 1 from an appropriate height.
- the molten slag S is supplied to the upstream side of dredging 2 by force such as a slag pan.
- the cooling drum 1 is rotationally driven by a driving device (not shown) so that the upper drum surface rotates in a rubbing direction. ⁇ ⁇ After the molten slag S supplied from 2 adheres to the drum surface 100 0 and is cooled, the molten slag S peels off from the drum surface 100 0 as the cooling drum 1 rotates and moves to the other side in the cooling drum radial direction. Discharged.
- the cooling drum 1 is preferably configured so that the number of rotations can be controlled according to operating conditions.
- the cooling drum 1 is provided with an internal cooling mechanism (not shown) having a flow path for passing a refrigerant, and a refrigerant supply section and a refrigerant discharge section for the internal cooling mechanism are provided at each end of the drum shaft. Each is provided.
- an internal cooling mechanism (not shown) having a flow path for passing a refrigerant, and a refrigerant supply section and a refrigerant discharge section for the internal cooling mechanism are provided at each end of the drum shaft.
- Each is provided.
- water cooling water
- other fluids liquid or gas
- a conveyor 8 for receiving and transporting the slag Sx that has been cooled and peeled off from the drum surface 100.
- the slag that adheres to the surface of the cooling drum 1 and is cooled is peeled off from the drum surface 100 by its own weight at the rotational position where the drum surface 100 starts to rotate downward, so that the conveyor according to the present embodiment 8 is high enough to receive the slag S x thus peeling It is arranged in the position.
- a guide member for guiding the slag S x peeled off from the drum surface 100 to the conveyance conveyor 8 may be provided.
- a slag bucket 9 for receiving heat and recovering heat by cooling the slag Sx with a refrigerant is provided at the transfer destination of the transfer conveyor 8.
- a chute may be provided between the cooling drum 1 and the slag packet 9 without providing the conveyor 8, and the slag Sx peeled off from the cooling drum 1 may be charged into the slag bucket 9 via this chute.
- cooling drum 1 of the present embodiment is a cylindrical body having a smooth surface, but is not necessarily limited thereto, and may have irregularities such as grooves.
- the molten slag S flowing down the reed 2 is supplied to the drum surface 100 of the cooling drum 1, and this molten slag S is the drum surface 100.
- an appropriate solidified state for example, a semi-solid state or a state where only one or both surface layers are solidified
- the natural weight is naturally removed from the cooling drum surface by its own weight at a predetermined drum rotation position.
- the separated slag SX is received by the conveyor 8 as it is, conveyed by the conveyor 8 and charged into the slag bucket 9. Note that the conveying speed of the conveyor 8 is almost the same as the circumferential speed of the cooling drum 1.
- the cooled slag S x peeled from the drum surface 100 of the single cooling drum 1 is discharged in the negative direction, so that the treated slag is handled.
- Easy post-processing Therefore, even when sensible heat is recovered from the cooled slag Sx, heat recovery can be efficiently performed with one heat recovery facility. Further, since the cooling drum 1 is not subjected to a large drop load due to the molten slag S, a large amount of molten slag s can be processed without damaging the cooling drum 1.
- the refrigerant is supplied into the slag packet 9, and the slag Sx is cooled.
- the slag S x peeled off from the cooling drum 1 may be cooled by other means or places.
- Cooled slag SX is a slag treatment or / and grinding process to make a slag product. It is sent to the processing process, and if necessary, it is sized by sieving.
- the slag S x immediately after the cooling by the cooling drum 1 is in the appropriate solidified state as described above, but still has plasticity, so it is peeled off from the surface of the cooling drum and transferred to the conveyor 8.
- the slag S x received is a plate-like continuum. However, depending on the thickness of the slag Sx and the degree of solidification, it may peel off from the surface of the cooling drum, and the continuous slag may be broken while it is received by the transfer conveyor 8, but this is not a problem.
- the slag S X may be roughly broken by appropriate means.
- FIG. 2 is a front view schematically showing another embodiment of the molten slag cooling processing apparatus and cooling processing method according to the present invention.
- the scissors 2 are provided so that the front ends thereof are in contact with or close to the drum surface 100 of the cooling drum 1, and the molten slag S extends from the front ends of the scissors 2 to the drum surface 100. Is directly supplied to the drum surface and adheres to the drum surface 100.
- the tip of the ridge 2 may be in contact with the drum surface 100, and may be close to the drum surface 100 0 by forming a small gap. In the latter case, it is preferable to bring the molten slag S close to each other in consideration of thermal expansion and the like, but in order to prevent the molten slag S from leaking reliably, It is preferable to inject purge gas from the gas injection means 10 provided below the rod 2.
- the gap between the heel tip and the drum surface 100 depends on the viscosity of the molten slag, but it is 5 mm or less, preferably 3 mm or less, even more desirable when performing slag treatment at high temperatures. l mm or less is preferable.
- the narrower the gap the lower the amount of purge gas.
- the limit of the gap that can suppress the leakage of molten slag without purge gas depends largely on the property (viscosity) of the molten slag, but if the gap is almost in contact with 1 mm or less, In most cases, leakage of molten slag can be suppressed without purge gas.
- the narrower the gap the more the wear and wear of the drum surface will be due to the contact of the tip.
- the tip of the heel that is likely to touch should be composed of carbonaceous material with good sliding properties, poron nitride, and other materials.
- the value of the gap is the value at the time of actual operation (high temperature state), and when installing the device at room temperature, it is necessary to consider the thermal expansion of the cooling drum as described above.
- An example of thermal expansion is shown below.
- Cooling drum 6 m [psi, coefficient of thermal expansion of the steel is 1 5 X 1 0 6, when the drum material average temperature of 2 0 0 ° C, in the radial direction by thermal expansion
- FIG. 3 is a front view schematically showing another embodiment of the molten slag cooling processing apparatus and cooling processing method according to the present invention.
- the scissors 2 are provided so that the front end thereof is in contact with or close to the drum surface 100 of the cooling drum 1, and the slag liquid is formed by the front end portion of the scissors 2 and the drum surface 100.
- a pool portion A is formed, and the molten slag S in the slag liquid pool portion A adheres to the drum surface 100 and is taken out as the cooling drum 1 rotates.
- the tip of ⁇ 2 has a saucer-like shape that is bent or curved upward (horizontal), and the tip of ⁇ 2 is in contact with or close to the lower drum surface. is doing.
- the side wall 200 at the tip of the ridge that forms the slag liquid reservoir A has a predetermined height in order to hold the molten slag S.
- the molten slag S supplied to ⁇ 2 flows into the slag liquid reservoir A, where it stays for an appropriate time. After being cooled, it adheres to the drum surface 100 of the cooling drum 1 and is taken out, and in the same manner as the embodiment of FIGS. 1 and 2, it adheres to the drum surface 100 and is in an appropriate solidified state (for example, semi-solid). After cooling to a solidified state or a state in which only one or both surface layers are solidified), it naturally peels from the cooling drum surface by its own weight at a predetermined drum rotation position. In this embodiment, the molten slag S stays in the slag liquid reservoir A for a sufficient period of time, so that cooling is facilitated, so that a thick slag S x can be easily obtained.
- FIG. 4 to 6 schematically show another embodiment of the molten slag cooling processing apparatus and the cooling processing method according to the present invention.
- FIG. 4 is a front view
- FIG. 5 is a plan view
- the cooling processing apparatus of this embodiment has a stretching roll 3 for rolling the molten slag S adhering to the drum surface 100 of the cooling drum 1 and stretching it in the drum width direction, and particularly has a viscosity.
- High slag basicity [mass ratio :. / o C a O /% S iO 2 ] (hereinafter simply referred to as “basicity”) is suitable for cooling treatment of molten slag having 2 or more.
- Examples of slag with a basicity ⁇ 2 include steelmaking slag such as ordinary steel and stainless steel converter decarburization refined slag, dephosphorization slag, electric furnace slag, waste gasification melting slag, waste incineration ash melting Examples include slag.
- an expansion mouth 3 as a slag expansion means is provided in parallel with the cooling drum 1.
- This spreading roll 3 rolls the molten slag S adhering to the drum surface 100 (upper outer peripheral surface) of the cooling drum 1 and extends it in the drum width direction.
- the outer peripheral surface 3 0 0 force S The support arm 11 is rotatably supported so as to form a predetermined interval t with the drum surface 100 of the cooling drum 1.
- a long oval bearing hole 110 is formed at the tip (lower end) of the support arm 1 1 in the vertical direction, and the roll shaft 3 0 1 of the extension roll 3 is vertically moved in the bearing hole 1 1 0. It is slidably supported.
- the spreading roll 3 of this embodiment is not driven, and the molten slag S adhering to the upper drum surface of the cooling drum 1 is rolled to the thickness of the interval t by its own weight.
- the stretch roll 3 is supported by the support arm 11 so as to be vertically slidable, so that the molten slag adhering to the surface of the cooling drum includes solids and lumps. Even in the case of rolling, the lump can be passed by the spreading roll 3 escaping upward.
- the extension roll 3 may have a structure that is rotatably and fixedly supported with respect to the support arm 11 so as to have a predetermined distance t with respect to the reject drum surface. In this case, it is preferable that the position of the spreading roll 3 can be adjusted in the vertical direction so that the interval t can be adjusted.
- a roll bearing that rotatably holds the spreading roll 3 is supported by a support arm 11 or the like via a spring, and an appropriate rolling force is obtained by the spring, and when a foreign object is swallowed, the roll bearing is expanded. It is good also as a structure which can retract the stretcher 3.
- the spreading roll 3 may be a driving roll.
- the spreader roll 3 rolls and expands the molten slag S adhering to the surface of the cooling drum, so its outer shell may be sufficiently smaller than the outer diameter of the cooling drum 1, but the roll length If the length of the slag becomes longer, the slag heats by its own weight, and the distance t from the cooling drum surface becomes easy to change in the drum width direction. Therefore, it is preferable to select the outer diameter according to the roll length and roll rigidity.
- the stretching roll 3 is preferably provided with the same internal cooling mechanism as that of the cooling drum 1 from the viewpoint of the cooling efficiency of the molten slag and the durability of the stretching roll.
- the extension rolls 3 may be provided at a plurality of locations in the circumferential direction of the cooling drum, and the slag adhered to the drum surface may be rolled in multiple stages by the plurality of extension rolls 3. Since the other configuration of the present embodiment is the same as that of the embodiment of FIG. 3, detailed description thereof is omitted. Further, the spreading tool 3 as in the present embodiment can be attached to a cooling processing apparatus having a form as shown in FIG. 1 or FIG.
- the molten slag S adhering non-uniformly to the drum surface 100 in this way is rolled in the drum width direction by being rolled by the spreading roll 3.
- the cooling efficiency of the molten slag S is increased and the cooling rate of the molten slag S is also increased.
- the molten slag S is adhered to the cooling drum surface and cooled to an appropriate solidified state (for example, a semi-solid state or a state where only the surface layer is solidified), Naturally peels from the cooling drum surface by its own weight at the ram rotation position.
- the thickness of the molten slag S is reduced, the slag cooling efficiency is increased, the productivity is improved, and the molten slag S is improved. Since the cooling rate of S becomes high, a slag solidified body that is difficult to be pulverized can be obtained. In addition, the solidification state of the slag is made uniform, and a uniform quality slag solid can be obtained.
- FIG. 7 is a plan view schematically showing another embodiment of the molten slag cooling processing apparatus and cooling processing method according to the present invention.
- the cooling processing apparatus of this embodiment also has a spreading roll 3 that is a slag extending means.
- a plurality of spreading rolls 3 x to 3 z are arranged on the cooling drum 1.
- the extension roll 3X is disposed at the center in the drum width direction at the upstream position in the cooling drum rotation direction, and the extension roll is provided at both sides of the drum width direction at the downstream position in the cooling drum rotation direction.
- 3 y and 3 z are arranged.
- the rolling range of the stretch rolls 3 y and 3 z in the drum width direction is partially overlapped with the rolling range of the stretch rolls 3 X in the drum width direction.
- the short stretched rolls 3x to 3z as in this embodiment are advantageous in making the rolling thickness of the slag uniform in the cooling drum width direction because the longitudinal deflection is small.
- FIG. 8 is a front view schematically showing another embodiment of the molten slag cooling processing apparatus and cooling processing method according to the present invention.
- the trough 2 is provided so that the tip thereof is in contact with or close to the drum surface 100 of the cooling drum 1, and the weir 4 is provided above the cooling drum 1.
- a slag liquid reservoir A is formed by the drum surface 100 and the tip of ⁇ 2, and an opening 5 is formed between the weir 4 and the cooling drum 1 through which the molten slag in the slag liquid reservoir A is pushed out.
- the width (thickness) of the opening 5 is preferably 5 mm or more. It is desirable that the thickness be 2 O mm or more. In addition, it is preferable to make the width (thickness) of the opening 5 variable by making the vertical position of the weir 4 adjustable.
- the weir 4 is composed of a fixed weir body 4a (wall body), and is supported on the apparatus main body (base body) via an appropriate support member.
- An internal cooling mechanism (not shown) having a flow path for passing a refrigerant may be provided inside the weir body 4a.
- a refrigerant supply unit and a refrigerant discharge unit for the internal cooling mechanism are provided.
- Each is provided.
- water (cooling water) is used as the refrigerant, but other fluids (liquid or gas) may be used. Since the other configuration of the present embodiment is the same as that of the embodiment of FIG. 3, detailed description thereof is omitted.
- the molten slag S supplied to ⁇ 2 flows into the slag liquid reservoir A, where it is cooled by being retained for an appropriate time. It is pushed out while being cooled from the opening 5 between the cooling drum 1 and the weir 4 (weir body 4a).
- the extruded molten slag S adheres to the cooling drum surface and is cooled to an appropriate solidified state (for example, a semi-solid state or a state where only one or both surface layers are solidified), and then, as shown in FIGS. Similar to the embodiment, it naturally peels from the cooling drum surface by its own weight at a predetermined drum rotation position. .
- the molten slag S is retained in the slag liquid reservoir A for a sufficient period of time, and cooling is further promoted. Since the cooling drum 1 also cools the molten slag S, it is possible to properly cool the molten slag S even if the width (thickness) of the opening 5 is sufficiently large and the thick slag S x is pushed out. . For this reason, from the opening 5, a suitably cooled plate-shaped slag S x having a thickness of 5 mm or more can be extruded. According to this embodiment, a thick slag solidified body having a thickness of about 20 to 30 mm can be easily manufactured.
- the slag Sx pushed out from the opening 5 is usually the lower surface and both sides of the side in contact with the cooling drum 1.
- the end surface is solidified and the upper surface side is in a molten or semi-molten state, there is no particular problem if the extruded slag SX is in such a solidified state.
- FIG. 9 is a front view schematically showing another embodiment of the molten slag cooling processing apparatus and cooling processing method according to the present invention.
- the cooling processing apparatus of this embodiment also has a weir 4 at the top of the cooling drum 1.
- the weir 4 provided on the upper part of the cooling drum 1 is constituted by the cooling drum 4 X having a rotating direction in which the lower drum surface rotates in the anti-slag liquid reservoir A direction.
- an internal cooling mechanism (not shown) having a flow path for passing the command medium is provided in the cooling drum 4x, and a refrigerant supply section and a refrigerant discharge section for the internal cooling mechanism are provided. Are provided at each end of the drum shaft. Note that water (cooling water) is generally used as the refrigerant, but other fluids (liquid or gas) may be used.
- the width (thickness) of the opening 5 is 5 mm or more, preferably 20 mm or more. Further, it is preferable that the width (thickness) of the opening 5 is made variable by making the vertical position of the cooling drum 4 x adjustable.
- the cooling drum 4x is also rotationally driven by the driving device (not shown) in the above rotation direction. It is preferable that the number of revolutions of both the cooling drum 1 and the cooling drum 4 x can be controlled according to the operating conditions. Note that the cooling drum 4 X does not have to be positioned immediately above the cooling drum 1 and may be displaced in the horizontal direction as in the present embodiment. Since the other configuration of the present embodiment is the same as that of the embodiment of FIG. 3, detailed description thereof is omitted.
- the molten slag S is cooled by staying in the slag liquid reservoir A for an appropriate time, and then between the cooling drum 1 and the cooling drum 4 x. As it is rolled, it is extruded from the opening 5 while being cooled. At this time, the molten slag is cooled by (i) staying in the slag liquid reservoir A for a sufficient period of time, and (ii) compared with the cooling drum 1 and the cooling drum 4 X at the entrance side of the opening 5. After the contact for a long time, the cooling slag S is cooled more effectively in the opening 5 by being cooled from both sides by the cooling drum 1 and the cooling drum 4 X. Therefore, a thick slag solidified body can be obtained more stably.
- cooling drum 1 and the cooling drum 4 x of the present embodiment and the cooling drum 1 of the embodiment of FIG. 8 are cylindrical bodies having a smooth surface, but are not necessarily limited to this, such as grooves and the like. You may have unevenness. If the drum surface has irregularities, the contact area with the molten slag increases and cooling of the slag can be promoted. There is also an advantage that the solidified slag can be easily broken and ground. Furthermore, heat recovery through the refrigerant also increases heat exchange efficiency because of its large specific surface area.
- a hole-shaped opening 5 is formed between the drum surface of the cooling drum 1 and the cooling drum 4x, and the slag is formed in the hole shape. It may be extruded in a shape. Therefore, the shape of the slag S x pushed out from the opening 5 between the cooling drum 1 and the cooling drum 4 x may be a line shape or a column shape in addition to the plate shape. In addition, depending on the uneven shape of the drum surface of the cooling drum 1 or the cooling drum 4 x, the opening 5 may be formed intermittently and the extrusion of the slag S x may be discontinuous. From 5 slag S x is extruded in a substantially massive shape.
- the thickness of the slag Sx pushed out from the opening 5 is defined as the maximum thickness t of the slag in the cooling drum radial direction as shown in FIG. And even when the shape of the extruded slag S x is other than a plate shape, the thickness of the slag SX according to the above definition is desirably 5 mm or more, preferably 20 mm or more.
- the thick slag S x extruded from the opening 5 is usually solidified only on one or both surface layers, and the inside is in a molten or semi-molten state. Then, the solidified surface layer portion immediately after being extruded from the opening 5 has a force that becomes a vitreous material or a structure close to that by being rapidly cooled by the cooling drum, and is then reheated by the heat of the unsolidified slag inside. It changes to crystalline. Therefore, in these embodiments, it is possible to obtain a thick slag solidified body with little glass.
- a hole-shaped opening 5 is formed by the above (i) or / and (mouth), The slag S x is extruded from the hole-shaped opening 5.
- FIG. 10 is a front view schematically showing a part of the cooling processing apparatus and cooling method
- FIG. 11 is a side view.
- a plurality of annular grooves 4 0 1 are formed on the drum surface 4 0 0 (outer peripheral surface) of the cooling drum 4 x at intervals in the longitudinal direction of the drum, and the drum surface 4 0 0 of the cooling drum 4 x Is brought into contact with the drum surface 100 of the cooling drum 1 so that a hole-shaped opening 5 is formed by the annular groove 40.1.
- the columnar slag S x is extruded from the plurality of hole-shaped openings 5 formed by the annular grooves 401.
- a plurality of annular grooves are formed at intervals in the drum longitudinal direction on the drum surface 100 of the cooling drum 1 instead of the drum surface 400 of the cooling drum 4 x, and the hole-shaped opening 5 is formed by the annular grooves. May be formed.
- FIG. 12 is a front view schematically showing a part of the cooling processing apparatus and the cooling processing method
- FIG. 13 is a side view.
- a plurality of annular grooves 10 0 1 and annular grooves 4 0 1 are spaced apart in the drum longitudinal direction on the drum surface 100 0 of the cooling drum 1 and the drum surface 4 0 0 of the cooling drum 4 x.
- the tip of the flange 2 is configured to mesh with the concave / convex shape in the axial direction of the cooling drum 1 (uneven shape formed by the plurality of annular grooves 10 1), and no gap is formed between the cooling drum 1 Or the gap is made as small as possible.
- the columnar slag S x is extruded from a plurality of hole-shaped openings 5 formed by combining the annular groove 1001 and the annular groove 4101.
- FIG. 14 is a front view schematically showing a part of the cooling processing apparatus and the cooling processing method
- FIG. 15 is a side view.
- a plurality of annular grooves 40.2 are formed at intervals in the drum longitudinal direction on the drum surface 400 of the cooling drum 4x, and the bottom surfaces of these annular grooves 40.2 are uneven in the drum circumferential direction.
- the drum surface 4 0 0 of the cooling drum 4 x is brought into contact with the drum surface 1 0 0 of the cooling drum 1 to form a hole-shaped opening 5 by the annular groove 4 0 2. This is what is done.
- the opening 5 is intermittently enlarged by the recess on the bottom surface of the annular groove 402.
- the slag SX is extruded from a plurality of hole-shaped openings 5 formed by the annular grooves 40.2. Since this slag Sx increases intermittently by the opening 5 force S due to the concave portion of the bottom surface of the annular groove 40 2, the slag S x is pushed out in a shape such that the block b is continuous in a bead shape.
- the slag Sx having such a shape is separated from the cooling drum 1 and then easily separated into a lump by a force of separating into a lump by its own weight or a small external force.
- groove-shaped or hole-shaped concave portions may be formed at intervals in the drum circumferential direction.
- the opening 5 is intermittently formed by the concave portion, and the massive slag Sx is pushed out from the opening 5.
- annular grooves are formed on the drum surface 100 of the cooling drum 1 instead of the drum surface 400 of the cooling drum 4 x. May be formed at intervals in the longitudinal direction of the drum, and a hole-shaped opening 5 may be formed by the annular groove or the like.
- FIG. 16 is a front view schematically showing a part of the cooling processing apparatus and the cooling processing method
- FIG. 17 is a side view.
- a plurality of annular grooves 10 2 and 4 3 are spaced apart in the drum longitudinal direction on the drum surface 100 0 of the cooling drum 1 and the drum surface 4 0 0 of the cooling drum 4 x.
- the bottom surfaces of the annular groove 100 2 and the annular groove 40 3 are formed in a concavo-convex shape (gear shape) in the drum circumferential direction, and the drum surface 400 of the cooling drum 4 x is formed on the cooling drum 1.
- the annular groove 10 2 and the annular groove 40 3 facing each other are combined to form a hole-shaped opening 5.
- the openings 5 are intermittently enlarged by combining the recesses on the bottom surfaces of the annular groove 1002 and the annular groove 403.
- the tip of the flange 2 is configured to mesh with the concavo-convex shape in the axial direction of the cooling drum 1 (the concavo-convex shape by the plurality of annular grooves 10 2), so that no gap is formed between the cooling drum 1 and the cooling drum 1. Or, the gap is made as small as possible.
- the slag Sx is pushed out from a plurality of hole-shaped openings 5 formed by combining the annular groove 10 2 and the annular groove 40 3.
- This slag Sx is shaped so that the opening b is intermittently enlarged by combining the recesses on the bottom surfaces of the annular groove 10 2 and the annular groove 40 3, so that the block b is connected in a rosary shape. Extruded.
- the slag S x having such a shape is separated from the cooling drum 1 and then easily separated into a lump by the force of separating into a lump by its own weight or a small external force.
- groove-like or hole-like recesses may be formed at intervals in the drum circumferential direction.
- the opening 5 is intermittently formed by the recess, and the massive slag S x is pushed out from the opening 5.
- FIG. 18 is a front view schematically showing a part of the cooling processing apparatus and cooling method
- FIG. 19 is a side view of the same.
- a plurality of recesses 10 3 and 4 0 4 having arcuate cross-sections (hemispheres) are formed on the drum surface 1 0 0 of the cooling drum 1 and the drum surface 4 0 0 of the cooling drum 4 x,
- the drum surface 400 of the cooling drum 4 x By bringing the drum surface 400 of the cooling drum 4 x into contact with the drum surface 100 of the cooling drum 1, the concave portion 10 3 and the concave portion 40 4 that face each other are combined to form an opening 5 intermittently. It is what was made to do.
- the massive slag Sx is extruded through a plurality of openings 5 that are formed intermittently by combining the M portion 103 and the concave portion 404.
- the drum surface of one of the cooling drums is configured to be smooth, and the concave surface (the concave portion 103 or the concave portion 40 4) is formed only on the drum surface of the other cooling drum. May be formed.
- the slag SX obtained in each of the embodiments shown in FIGS. 10 to 19 described above is as follows.
- A) The slag SX immediately after being pushed out from the opening 5 can be easily processed into a massive slag by a simple crushing means.
- the specific surface area of the slag is large, so that the heat exchange efficiency is high and efficient heat recovery can be performed.
- there is an advantage that the labor of crushing and grinding slag in the subsequent process is unnecessary or less.
- the slag S x may be broken by a crushing device such as a crusher or sheared by a shearing device.
- a crushing device such as a crusher or sheared by a shearing device.
- the molten slag S adheres to the drum surface 100 of the rotating cooling drum 1 in a layered manner, and necessary cooling is performed while the cooling drum 1 rotates by an appropriate rotation angle in this state. It is preferable to do so.
- the rotation speed of the cooling drum 1 is preferably about 2 to 20 rpm. More preferably, it is about ⁇ 10 rpm. In that case, the peripheral speed of the drum surface of the reject drum 1 depends on the diameter of the cooling drum 1, but for example, 0.1 to 2 More preferably, it is more preferably about 0.1 to 1 mZsec. When the rotational speed of the cooling drum 1 exceeds the above range, the molten slag is difficult to contact and adhere to the drum surface 100.
- the peripheral speed of the drum surface 100 exceeds S mZsec, in the case of molten slag such as blast furnace slag due to the force received from the drum, it will be torn and become fine particles or fibers. Therefore, it is not preferable as slag product quality.
- the rotation speed of the cooling drum 1 is less than the above range, the processing amount is small, and it is not suitable for a large amount of slag processing.
- the roll cooling process is finished with the solidified layer thickness increasing and the semi-solidified part disappearing or almost disappearing. Almost no progress is made.
- the amorphous layer formed on the surface layer that is in contact with the roll cannot be eliminated, and the hygroscopicity is reduced, or the product is in a sharp and angular state as a characteristic of the amorphous phase of the surface layer.
- the quality is not preferable.
- the slag may stagnate into the irregularities of the roll.
- the rate of heat extraction to the roll increases, which is not preferable from the viewpoint of reducing heat recovery efficiency. Since it is about ° C ⁇ 10 ° C, heat recovery from cooling water is difficult.
- FIG. 26 shows an example of the relationship between the number of rotations of the cooling drum 1 and the slag processing amount of the cooling processing apparatus of the present invention.
- cooling is performed on the lower drum surface of the cooling drum 1.
- a drum cooling means for spraying fluid may be provided.
- This cooling means can be constituted by, for example, a nozzle that sprays a cooling fluid such as water or air onto the lower drum surface of the cooling drum 1.
- the cooling drum 4 x A drum cooling means for spraying a cooling fluid on the drum surface may be provided.
- This cooling means can also be constituted by, for example, a nozzle that sprays a cooling fluid such as water or air onto the drum surface of the cooling drum 4 x.
- cooling means 7 may be provided for cooling the slag Sx peeled from the cooling drum 1 between the cooling drum 1 and the transfer conveyor 8 or on the transfer conveyor 8.
- the cooling means 7 can be constituted by, for example, a nozzle that sprays a cooling fluid such as water or air onto the slag Sx.
- a fluid supply means for injecting fluid into the slag liquid reservoir A is provided.
- a fluid such as a gas may be supplied from the fluid supply means into the slag liquid reservoir A for the purpose of one or more of b) reforming of slag and (c) sensible heat recovery of molten slag.
- cooling the slag can be promoted by blowing a fluid such as gas into the slag liquid reservoir A and stirring the slag bath.
- FIG. 20 is a front view schematically showing one embodiment of the cooling processing apparatus and the cooling processing method in that case.
- the fluid blowing means 6 is provided at the bottom of the front end portion of the slag 2 that constitutes the slag liquid reservoir A, and the fluid is blown into the slag liquid reservoir A from the fluid blowing means 6.
- the fluid blowing means 6 is composed of, for example, a gas blowing nozzle.
- the fluid supply means 6 is provided on the side wall 20 0 of the bowl 2, and the slag liquid reservoir A in the slag liquid reservoir A is provided.
- a method of supplying fluid to the slag liquid reservoir A and a method of blowing fluid into the slag liquid reservoir A from above the slag liquid reservoir A can be employed.
- the fluid supplied into the slag liquid reservoir A include air, oxygen-enriched air, oxygen gas, nitrogen gas, carbon dioxide gas, water vapor, natural gas, city gas, propane gas, coke oven gas, and other One or more of these may be used.
- the temperature of the molten slag is usually lowered by supplying a fluid.
- the fluid for example, air, nitrogen gas, water vapor or the like can be used.
- slag reforming for example, for the purpose of reducing the amount of f-C a O in the slag, oxygen such as air, oxygen-enriched air, oxygen gas or oxygen-containing gas is used. Can be used. If such a gas is supplied, the molten slag will oxidize F e O in the slag, and this will combine with f-C a O to form 2 C a O ⁇ F e 2 0 3. -The amount of C a O decreases, and hydration expansion can be suppressed when the obtained slag solidified body is used for roadbed materials.
- the supplied fluid is recovered as described later, and heat recovery is performed from this fluid.
- the fluid for example, air, nitrogen gas, water vapor or the like can be used.
- the supply of the fluid into the slag liquid reservoir A can also be applied to the embodiment as shown in FIG.
- a cooling system with slag liquid reservoir A (a) temperature adjustment of molten slag in slag liquid reservoir A, (b) slag reforming, (c) slag breakage or grinding treatment
- the powder can be added to the molten slag in the slag liquid reservoir A for the purpose of improving the product yield by reusing the slag powder generated in step 1.
- the powder include slag powder, silica sand, fly ash (coal ash), brick scrap, iron oxide powder, dust, sludge, iron ore powder, and one or more of these can be used.
- the temperature of the molten slag is lowered by adding powder.
- the temperature by adding such powder especially by adding granular slag (slag powder), the following effects can be expected.
- solidification can be promoted by rapidly lowering the slag temperature.
- This is particularly effective for promoting cooling and solidification in the slag when it is necessary to rapidly cool the product slag with a large slag thickness to obtain a high-quality slag product. If the added amount exceeds 50%, the slag temperature is too low and the slag is likely to be agglomerated, making it difficult to adjust the shape and thickness as well as the cooling rate. On the other hand, when the addition amount is less than 1%, it is practically difficult to adjust the slag temperature.
- the amount of slag can be increased and the difference between the surface temperature and the internal temperature of the solid slag can be reduced. Is.
- cooling and solidification of molten slag is promoted, it is possible to reduce the thermal load and thermal fatigue of the cooling drum 1 and the extension roll 3.
- Sio 2 source such as silica sand fly ash
- a 1 2 0 3 source such as alumina brick scrap
- iron oxide source such as iron oxide powder and iron ore powder
- the product yield can be improved by adding slag powder produced when the slag cooled by the method of the present invention is broken or Z and ground.
- the sensible heat recovery of the molten slag it is desirable to perform heat recovery of at least one, preferably two or more, and particularly preferably all of the following (i) to (iv).
- the slag cooled by the cooling drum 1 is further cooled by bringing it into contact with a refrigerant (for example, steam, water, air, etc.), and heat is recovered by recovering the refrigerant.
- a refrigerant for example, steam, water, air, etc.
- the refrigerant is basically brought into contact with the slag in a closed space, and then the refrigerant exchanged with the slag is recovered.
- a a method in which the slag cooled by the reject drum 1 is brought into contact with the refrigerant while being conveyed by the conveying means, and heat is recovered from the refrigerant
- the slag cooled by the cooling drum 1 is removed by the refrigerant.
- Various methods such as cooling with a supplied cooling container or cooling device and recovering heat from the refrigerant can be employed.
- heat recovery is performed from the refrigerant that has passed through the internal cooling mechanism of the cooling drum 1 and the weir 4 (preferably the cooling drum 4 x).
- the transport competitor 8 of each of the above-described embodiments is covered with a tunnel, and the slag is cooled by flowing a coolant through the tunnel, and heat is generated from the coolant.
- the slag is accommodated and cooled in a cooling container to which a refrigerant is supplied, and heat is recovered from the refrigerant.
- the cooling container for example, the slag bucket 9 of each of the embodiments described above can be used, and heat is recovered from the refrigerant passing through such a cooling container. It is also possible to insert slag into a cooling device such as a screw feeder or rotary kiln, supply a refrigerant such as air into the interior of the slag, cool the slag, and recover heat from the refrigerant.
- a fluid recovery hood or the like is provided above the cooling drum 1 to recover the fluid that has passed through the molten slag S in the slag liquid reservoir A and to recover heat from this fluid. .
- heat recovery is performed from a refrigerant or gas in a heat recovery facility (not shown).
- the recovered heat can be used as various heat sources such as a raw material drying heat source and a fuel drying steam heat source.
- the slag cooled by the cooling container or the cooling device preferably has a small particle size from the viewpoint of the efficiency of sensible heat recovery. Those cooled in the embodiment shown in FIGS. 10 to 19 are preferable.
- FIG. 21 is a front view schematically showing one embodiment of the cooling treatment method relating to the form (iii).
- a cooling apparatus similar to that of the embodiment of FIGS. 14 and 15 is used, and the slag S x or the slag S x that is easily separated into lumps is extruded from this apparatus, and the slag S x Is further crushed by a crushing device such as a crusher 1 3, and then charged into a hermetic cooling container 14 by a conveyor 8.
- the temperature of the slag S x charged into the cooling container 14 is usually from 700 to 100 ° C. Pressure air as a refrigerant is blown into the cooling container 14 to cool the slag Sx.
- the air (hot air) heated by the slag S x sensible heat is discharged out of the cooling container 14 and is recovered by an appropriate heat exchange means.
- the slag S x cooled to an appropriate temperature is taken out from the internal power of the cooling container 14 and sent to the necessary processing steps. 9 055723
- the other apparatus configurations and cooling processing modes are the same as those in the embodiment shown in FIGS. 3, 9, 14, and 15, and detailed description thereof is omitted.
- FIG. 22 is a front view schematically showing another embodiment of the cooling treatment method according to the form (iii).
- Figure 21 When using a sealed cooling container 14 as shown in Fig. 1, it is necessary to hold the slag and the refrigerant in the container for a certain period of time. If only one cooling container 14 is used, the processing efficiency will be reduced. There is a problem. In order to deal with such a problem, in the embodiment of FIG. 22, a plurality of cooling containers 14 a to 14 c are provided, and these cooling containers 14 a to 14 c are sequentially used (slag equipment). It is designed to enable efficient treatment by entering, heat recovery, and slag discharge.
- FIG. 23 is a front view schematically showing another embodiment of the cooling method according to the form (iii).
- the slag is transferred by a screw feeder 15 as a cooling device
- the slag is cooled by supplying pressurized air as a refrigerant therein.
- the pressurized air is supplied from the outlet side of the screw feeder 15 toward the inlet side.
- the air that has flowed through the squeegee feeder 1 5 and cooled the slag is taken out of the machine and recovered by appropriate heat exchange means.
- FIG. 24 is a front view schematically showing another embodiment of the cooling treatment method according to the form (iii).
- This embodiment uses a cooling device that is almost the same as that of the embodiment of FIGS. 4 to 6.
- the slag S x that is cooled and discharged by this device (for example, the slag S that is being transported by the transport conveyor 8).
- a refrigerant such as mist (water + compressed air) is supplied (injected) from the refrigerant supply means ⁇ 6 to the mouth surface of the slag spreading roll 3 being cooled on the drum surface 100. ) And cool them.
- the mist (water + compressed air) from the refrigerant supply means 16 a is also applied to the lower surface of the cooling drum 1.
- Supply (inject) refrigerant such as to cool the drum surface 100.
- spray water or the like can be used as the medium.
- Equipment on the outlet side of the equipment such as the cooling processing device and the refrigerant supply means 16 and 16 a, is covered with a cover 17, and an exhaust pipe 18 is connected to the cover 17.
- the exhaust pipe 18 is provided with a heat exchanger 19.
- the amorphous phase of the slag surface layer formed at the drum contact part is supplied with heat from the semi-solidified part inside the slag.
- the amorphous phase By waiting for the amorphous phase to disappear due to heat and then performing mist cooling, there can be no amorphous phase and the entire slag can be appropriately cooled.
- a high-quality slag product with reduced pulverization and expandability can be obtained by installing a radiation thermometer, etc., to grasp the slag surface temperature, adjust the cooling rate by mist cooling, etc. Obtainable.
- exhaust gas Steam and heated gas generated by the contact between the refrigerant and the slag in the cover 17 are collected through the exhaust pipe 18, and the heat medium and heat are exchanged in the heat exchanger 19. By replacing it, slag sensible heat is recovered.
- exhaust gas can be obtained by heat exchange with the exhaust gas.
- the exhaust pipe 18 is provided with a gas thermometer 20 to measure the exhaust gas temperature.
- the control device 21 based on the measurement of the exhaust gas temperature by the gas thermometer 20, the amount of refrigerant supplied from the refrigerant supply means 16 so that the desired exhaust gas temperature is obtained (for example, the refrigerant is mist). In this case, the amount of mist and air / water ratio, and the amount of water in the case of spray water are controlled.
- the cooling drum 1 is cooled by flowing cooling water through the refrigerant flow path.
- a part of the cooling water that has passed through the cooling drum 1 or a vapor generated from a part of the cooling water is It can be used as at least a part of the refrigerant (steam, water) supplied from the refrigerant supply means 16, and thereby sensible heat recovery of slag can be made more efficient.
- the exhaust pipe 18 may not be provided with the heat exchanger 19 and the exhaust gas may be used as a heat source as it is.
- the slag S x cooled to a suitable temperature is sent to the necessary processing steps to become product slag.
- slag powder fine slag
- the slag powder may be added to the molten slag of the slag liquid reservoir A to adjust the temperature of the molten slag. 2 2 in the figure is the slag powder feeder for that purpose.
- cooling processing apparatus of any of the embodiments of FIGS. 1 to 19 may be used.
- the space above the slag liquid reservoir A is covered with a gas recovery hood, and a gas discharge pipe is connected to the hood, and the slag liquid reservoir A is
- the ascending gas is sent to an appropriate gas recovery system using a hood and a gas exhaust pipe.
- This embodiment is particularly suitable when the hydrocarbon component-containing gas such as steam (water) and natural gas or coke oven gas described above is supplied into the slag liquid reservoir A at the same time.
- the thick slag S x can be stably obtained by adjusting the distance (width of the opening 5) to a predetermined distance.
- the opening 5 cannot be narrowed or closed. Therefore, the supply amount of the molten slag S to the cooling apparatus is adjusted at the initial stage of operation. (In other words, a larger amount of molten slag S than the amount of extrusion from the opening 5 is supplied), so that the slag liquid reservoir A is rapidly formed.
- the cooling drum can be controlled so that the liquid surface height of the slag liquid reservoir A can be controlled to constant when the amount of molten slag received changes.
- the rotational speed of 1 By changing the rotational speed of 1, the slag S x having a constant thickness can be obtained stably.
- the spreading roll 3 provided in the cooling processing apparatus shown in FIGS. 4 to 6 also has an internal cooling mechanism.
- FIG. 25 is a schematic cross-sectional view showing an embodiment of the internal cooling mechanism.
- the extending roll 3 has a refrigerant flow path 30 inside thereof, and refrigerant passages 40a, 4Ob along the axial direction of the roll shafts 31a, 3lb.
- the inside of the expansion port 3 is simply hollowed, and this hollow portion is used as the refrigerant flow path 30, and the refrigerant paths 3 1 a and 3 lb communicate with both ends of the refrigerant flow path 30.
- It is a structure.
- the reason for this structure is as follows. In the slag cooling device, it is preferable to recover the slag sensible heat through the refrigerant, and as one of the forms of slag cooling 'heat recovery in that case, the slag is cooled by the latent heat of evaporation of the cooling water flowing through the refrigerant flow path. However, it is conceivable to recover the vapor from the refrigerant flow path.
- the refrigerant flow path 30 is configured by making the inside of the roll hollow as in the present embodiment, The cooling water is heated to boil and convection of the hot water occurs. For this reason, the cooling water introduced into the refrigerant flow path 30 from the refrigerant path 3 la does not immediately flow out of the refrigerant path 3 1 b, but instead of the refrigerant flow path 30 by the convection of the hot water as described above. It stays properly inside and functions as a refrigerant, and the latent heat of vaporization provides a high cooling effect with a small amount of cooling water. On the other hand, the vapor generated in the refrigerant flow path 30 can be easily separated and collected in the middle of the refrigerant circulation path after leaving the refrigerant flow path 30.
- the slag that has been cooled and solidified by the cooling treatment method of the present invention is crushed or / and polished, and if necessary, the size is adjusted by sieving. By doing so, a granular slag product can be obtained.
- a slag product having a particle size of 5 mm or more can be easily produced, and in particular, a slag product having a particle size of about 20 to 30 mm can be easily produced.
- civil engineering and construction materials such as roadbed materials, coarse aggregates, fine aggregates, marine civil engineering materials, and roadbed materials and coarse aggregates are particularly suitable.
- the slag product obtained by the present invention is produced by rapid cooling, pulverization is suppressed, and therefore, the fine powder portion is reduced, and seawater does not become cloudy when used as marine earth and wood.
- the crushing process can be simplified, and coarse and fine aggregates with less fine particles can be obtained.
- it since it is dense, its water absorption is low, and it becomes a hard material that can also be used for ASKCON.
- free CaO can be reduced by slag reforming, aging is easy, and expansion can be suppressed by atmospheric aging without applying steam aging, so it can also be used as a roadbed material.
- the cooled slag separated from the drum surface (1 0 0) of the single horizontal cooling drum (1) is discharged in the-direction. Therefore, it is easy to handle and post-process the slag after cooling, and the equipment cost can be kept low.
- the cooled slag when recovering sensible heat from treated slag, treat the cooled slag that is discharged in two opposite directions like a conventional twin-drum slag cooling treatment device with one heat recovery facility. Then, the slag temperature decreases in the process of making two paths in the opposite direction into one, and efficient heat recovery cannot be performed, whereas in the present invention, the cooled slag is discharged in one direction. Therefore, heat recovery can be performed efficiently.
- the horizontal cooling drum (1) is not subjected to the drop load of the molten slag, or the drop load is made sufficiently small. Therefore, even in a large processing apparatus, it is possible to process a large amount of molten slag without using a tundish. Further, by selecting the bowl shape, the molten slag can be expanded in the drum width direction, and the molten slag can be uniformly cooled on the drum surface (1 0 0).
- the cooling processing apparatus in which the slag liquid reservoir (A) is formed by the ridge (2) and the drum surface (100) and the method for cooling the molten slag using this, the cooling of the molten slag is performed.
- the thickness of the slag adhered to the drum surface (1 0 0) can be secured even when the molten slag has a relatively low viscosity, and a thick slag solidified body is obtained. be able to.
- the molten slag adhered to the drum surface (100) is removed by the spreading roll (3). Since rolling is performed in the drum width direction, the molten slag having a relatively high basicity and viscosity can be cooled with high cooling efficiency, and a slag solidified body can be obtained with high productivity. In addition, since the molten slag can be cooled at a high cooling rate, it is possible to obtain a slag solidified body that is not easily pulverized even for slag having a particularly high basicity.
- the weir (4), the drum surface (100) and the dredging (2) have a relatively large slag. Since the liquid reservoir (A) can be formed and the residence time of the molten slag in the slag reservoir (A) can be lengthened, the cooling of the molten slag can be promoted particularly effectively, and the appropriately cooled slag Can be extruded from the opening (5). Therefore, a thick slag solid can be obtained by sufficiently increasing the width of the opening (5) (thickness of the extruded slag).
- the weir (4) is composed of a cooling drum (4x) having a rotating direction whose lower outer peripheral surface rotates in the direction of the anti-slag liquid reservoir (A), thereby cooling the molten slag more effectively.
- the thick slag solidified body can be obtained more stably.
- a slag product having a desired particle size can be stably produced at a low cost by using the cooling method as described above.
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- Structural Engineering (AREA)
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Abstract
Description
Claims
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CN2009801095222A CN101977866B (zh) | 2008-03-20 | 2009-03-17 | 熔渣冷却处理装置以及冷却处理方法 |
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JP2008-072692 | 2008-03-20 | ||
JP2008072692A JP5544684B2 (ja) | 2008-03-20 | 2008-03-20 | 溶融スラグの冷却処理装置および冷却処理方法 |
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JP (1) | JP5544684B2 (ja) |
KR (1) | KR20100103582A (ja) |
CN (1) | CN101977866B (ja) |
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WO (1) | WO2009116675A1 (ja) |
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CN102181591A (zh) * | 2011-04-14 | 2011-09-14 | 重庆大学 | 多管式罐内炉渣可控温冷却装置 |
JP2012001418A (ja) * | 2010-06-21 | 2012-01-05 | Jfe Steel Corp | スラグの顕熱回収方法 |
JP2012001417A (ja) * | 2010-06-21 | 2012-01-05 | Jfe Steel Corp | 溶融スラグの処理設備 |
JP2017109917A (ja) * | 2015-12-11 | 2017-06-22 | Jfeスチール株式会社 | 酸化物鋳造体の製造方法 |
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JP5949575B2 (ja) * | 2012-01-31 | 2016-07-06 | Jfeスチール株式会社 | 凝固スラグの熱回収システムおよび熱回収方法 |
WO2013122074A1 (ja) * | 2012-02-17 | 2013-08-22 | Jfeスチール株式会社 | 凝固スラグ製造装置、コンクリート用粗骨材の製造装置、凝固スラグ製造方法およびコンクリート用粗骨材の製造方法 |
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JP6060921B2 (ja) * | 2014-03-03 | 2017-01-18 | Jfeスチール株式会社 | スラグ連続鋳造装置 |
KR101648305B1 (ko) * | 2015-05-26 | 2016-08-12 | 현대제철 주식회사 | 슬래그 재활용 방법 |
CN105621906B (zh) * | 2015-12-30 | 2018-01-30 | 中冶东方工程技术有限公司 | 一种冶金熔渣粒化处理系统及方法 |
KR101658617B1 (ko) * | 2016-03-21 | 2016-09-22 | 에이치설퍼 주식회사 | 얇은 유황 플레이크의 제조방법 |
CN107164588A (zh) * | 2017-05-26 | 2017-09-15 | 济钢集团国际工程技术有限公司 | 钢渣余热回收及加压闷渣系统及工艺 |
KR102083873B1 (ko) * | 2018-05-10 | 2020-03-03 | 재단법인 포항산업과학연구원 | 용융슬래그 현열회수장치 |
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US11820658B2 (en) * | 2021-01-04 | 2023-11-21 | Saudi Arabian Oil Company | Black powder catalyst for hydrogen production via autothermal reforming |
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KR102696993B1 (ko) * | 2022-01-11 | 2024-08-20 | 백낙영 | 규산나트륨 분쇄물의 제조 방법 |
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- 2009-03-17 CN CN2009801095222A patent/CN101977866B/zh active Active
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JP2000510197A (ja) * | 1996-05-15 | 2000-08-08 | フェスト アルピネ インダストリアル サーヴィシス ゲゼルシャフト ミット ベシュレンクテル ハフツング | ガラス質又はガラス化した溶鉱炉スラグを連続的に生産する方法 |
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JP2012001418A (ja) * | 2010-06-21 | 2012-01-05 | Jfe Steel Corp | スラグの顕熱回収方法 |
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CN102181591A (zh) * | 2011-04-14 | 2011-09-14 | 重庆大学 | 多管式罐内炉渣可控温冷却装置 |
JP2017109917A (ja) * | 2015-12-11 | 2017-06-22 | Jfeスチール株式会社 | 酸化物鋳造体の製造方法 |
Also Published As
Publication number | Publication date |
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TW200951098A (en) | 2009-12-16 |
TWI393697B (zh) | 2013-04-21 |
JP5544684B2 (ja) | 2014-07-09 |
KR20100103582A (ko) | 2010-09-27 |
CN101977866B (zh) | 2013-07-17 |
CN101977866A (zh) | 2011-02-16 |
JP2009227497A (ja) | 2009-10-08 |
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