Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F27—FURNACES; KILNS; OVENS; RETORTS
  • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
  • F27D15/00—Handling or treating discharged material; Supports or receiving chambers therefor
  • F27D15/02—Cooling
• • 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 
• • C—CHEMISTRY; METALLURGY
  • C21—METALLURGY OF IRON
  • C21B—MANUFACTURE OF IRON OR STEEL
  • C21B3/00—General features in the manufacture of pig-iron
  • C21B3/04—Recovery of by-products, e.g. slag
  • C21B3/06—Treatment of liquid slag
  • C21B3/08—Cooling slag
• • C—CHEMISTRY; METALLURGY
  • C21—METALLURGY OF IRON
  • C21B—MANUFACTURE OF IRON OR STEEL
  • C21B2300/00—Process aspects
  • C21B2300/02—Particular sequence of the process steps
• • 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
  • C21B2400/024—Methods of cooling or quenching molten slag with the direct use of steam or liquid coolants, e.g. water
• • 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

Definitions

• the present invention relates to a method for treating high-temperature slag discharged from a hot metal pretreatment furnace, a converter, an electric furnace or the like in a hot metal pretreatment process or a steelmaking process at a high temperature of 120.degree. Specifically, it efficiently cools hot metal pretreatment slag, converter slag, and electric furnace slag containing CaO that is discharged from hot metal pretreatment furnaces, converters, electric furnaces, etc. at high temperatures.
• the present invention relates to a processing method and a processing apparatus for efficiently separating and recovering bullion contained in these slags at low cost so that the slag can be effectively used for roadbed materials and marine materials. Background art
• a large amount of high-temperature slag containing CaO from 120 to 1600 is generated from the hot metal pretreatment process and steelmaking process (hot metal pretreatment furnace, converter, electric furnace, etc.) Then discharged.
• These high-temperature slag contains a large amount of iron bullion.
• the slag is used as marine material for roadbed materials, and bullion is used as raw material for steelmaking. For this reason, slag treatment as shown in Figs. 6 and 7 has been performed.
• the molten slag containing C aO is stored in the slag pan 1 mounted on the wagon and transported to an outdoor slag treatment plant.
• the slag treatment plant there are a number of cooling pipes or yards 2 with sprinklers 4, and one of these cooling pipes (yards) 2 is connected as shown in Fig. 6 (A).
• Hot slag 3 is discharged. This discharge starts at 20 minutes It takes 1 hour. After that, it is allowed to cool for 2 to 4 hours (air cooling) to prevent a steam explosion.
• the cooled slag 6 is sprinkled with a large amount of cooling water 5 from the sprinkler 4 as shown in (B) of FIG.
• the This watering is done for at least 3 hours at least, and for slag that is difficult for water to penetrate for 2-3 days. For this reason, many cooling pits 2 are installed and used in sequence.
• the slag 7 cooled in this way is excavated by a construction or civil engineering machine 8 as shown in (C) of FIG. 6, and is transported to a crushing plant with a dumping force of 9 as shown in (D) of FIG. .
• the cooled slag 7 is first put into the hopper 1 1 as shown in Fig. 7, and the primary compressor 3 3 passes the primary magnetic separator 3 4 to separate the large ingot 3 5. .
• the primary breaker 36 passes the primary magnetic separator 3 4 to separate the large ingot 3 5.
• a secondary magnetic separator 3 8 is provided on the secondary competitor 39, and the bulk metal 3 7 is separated.
• the slag is applied to the primary vibrating sieve 40 and crushed by the secondary crusher 4 2 by the tertiary compressor 4 1.
• the crushed slag is transported by the 4th-order compressor 4 4 and the small ingot 4 5 is separated by the 3rd magnetic separator 4 3, and the middle lumped slag 4 7 and the small lumped slag are separated by the secondary vibrating sieve 4 6. Classified into 4 8.
• the slag After cooling the high-temperature slag and separating and collecting the metal from the slag in this way, the slag is effectively used as civil engineering materials such as roadbed materials or marine materials.
• the unreacted C aO component dispersed in the fine powder portion in the slag is dispersed as C a (OH) 2 in the water, and C a (OH) 2 adheres to the entire slag in contact with the water.
• C a (OH) 2 adheres to the entire slag in contact with the water.
• slag is separated into bullion and slag by passing through a crusher and a magnetic separator many times, but solidified slag has considerable hardness. If a powerful crusher is not used, sufficient crushing cannot be performed.
• the bullion obtained in this way has a low iron content because the slag is not sufficiently separated, and 70% to 80% through a two-stage crusher, and 8% through a three-stage crusher. There is a problem that only an iron content of ⁇ 90% can be obtained.
• Japanese Patent Laid-Open No. 20 0 3-2 4 7 7 8 6 discloses that a steel slag is slowly cooled in a container to form a high-temperature slag mass containing a large amount of ⁇ ′-Ca 2 Si0 4.
• a method for treating steelmaking slag comprising the second step is disclosed.
• the metal part with a large particle size can be recovered by the screen.
• the rotary cooler is not a pressure vessel, and since there is no customization function or mechanical crushing process, pulverization due to phase transformation is unlikely to occur. . Therefore, the quality of the obtained bullion is lower than that of the method disclosed in Japanese Patent Laid-Open No. 6_3 4 6 1 61 described later and cannot be used in a steelmaking furnace.
• limiting the basicity limits the range of applicable slag, which is not a general method.
• JP-A-6-3 4 6 1 61 steelmaking slag is atomized in water, then classified by particle size with a screen or the like, and the classified slag is dropped into the blower flow.
• a method for recovering metal in a steelmaking slag in which heavy slag is sorted into low slag and high slag is sent to a furnace to extract the metal.
• atomization requires a large amount of equipment and cost, and the problem of steam explosion is inevitable.
• the resulting slag lump has a large variation in particle size, and mechanical crushing requires wind sorting.
• the obtained bullion is low in quality with 50 to 90% iron and has a large variation, making it difficult to use in steelmaking furnaces.
• Japanese Patent Laid-Open No. 6-2 8 1 3 6 3 steelmaking slag is solidified on a slag pan, and high-temperature rough crushing slag obtained by mechanically crushing it is placed in a sealed pressure vessel, and from above. Water vapor generated by sprinkling cooling water A method is disclosed in which the inside of a pressure vessel is brought to a predetermined pressure condition by air and crushed using slag expansion by rapid cooling and hydration. The resulting fine-grained slag is used as it is, and the coarse-grained part is mechanically broken and magnetically separated to produce steelmaking raw materials.
• a high-temperature pressure vessel requires a large amount of equipment and cost, and the problem of steam explosion is inevitable.
• the present invention solves the above-mentioned conventional problems, and there is no problem of generating dust and the generation of strong alkaline water in the treatment process as in the conventional water-cooling method in the slag yard. It is possible to efficiently recover slag as a valuable resource that can be used more effectively without the need for it, and efficiently recover bullion contained in the slag without causing a steam explosion or fire and contain iron
• An object of the present invention is to provide a high-temperature slag treatment method and a treatment apparatus that can obtain a high-rate metal. Another object of the present invention is to enable these without requiring excessive facilities and costs.
• the present invention has been made to achieve the above object, and the gist of the present invention is as follows.
• This is a high-temperature slag treatment method in which high-temperature slag containing C aO is primarily cooled, and then this primary-cooled slag is charged into the cooling device and then cooled while moving inside the cooling device.
• a method for treating high-temperature slag characterized in that both primary cooling and secondary cooling are water cooling within a range in which free water is not generated.
• a grizzly is installed on the inlet side of the slag of the cooling device, and after separating and collecting the bulk metal in the slag after the primary cooling, it is charged into the cooling device (1
• the residence time of the slag in the rotary cooler is set to 10 to 20 minutes, and the metal contained in the slag is separated. (4) or (5) Processing method.
• a vibrating sieve and a magnetic separator are installed on the slag discharge port side of the rotary cooler to separate and collect the slag and bullion broken inside the rotary cooler (4) to (6)
• the method for treating high-temperature slag according to any one of the above.
• the temperature of the slag charged into the cooling device is from 700 to: 1250, according to any one of (1) to (7)
• a high-temperature slag treatment device that cools a high-temperature slag containing C aO after primary cooling while moving the inside thereof. And a cylindrical casing having a slag inlet at one end and a slag outlet at the other end, and a support roller for rotatably supporting the casing on the outer surface.
• a low leakage leaker having a rotary drive device for rotating a cylindrical casing around an axis, cooling air blowing means for blowing cooling air to the slag inside the casing, and cooling water to the slag
• a processing apparatus for high-temperature slag characterized by comprising cooling water supply means for supplying.
• a high-temperature slag treatment device that cools high-temperature slag containing CaO after primary cooling while moving the inside, the treatment device comprising a slag inlet at one end and the other end A cylindrical casing having a slag discharge port, a vibration conveyor having a vibration plate for conveying the slag in the axial direction of the casing while applying vibration, and blowing cooling air to the slag. Therefore, there is provided a high-temperature slag treatment apparatus comprising cooling air spraying means and cooling water supply means for supplying cooling water to the slag.
• the high-temperature slag treatment apparatus according to (13), further comprising a vibrating screen and a magnetic separator for separating and collecting the slag and the metal on the slag discharge side of the treatment apparatus.
• a high-temperature slurry containing CaO discharged from the furnace According to the present invention, a high-temperature slurry containing CaO discharged from the furnace.
• the primary and secondary cooling is performed by water cooling in a range that does not generate free water, so C a O in the slag is eluted into the cooling water as in the past. Without doing it
• the water gasification reaction between carbon and water in the slag proceeds due to ⁇ _ that the high-temperature slag comes into contact with water molecules, and the CO produced by this reaction is C ⁇ 2 and C o 2 which shift reaction is also proceeds generated consisting alters the C A_ ⁇ in the slag to C a C_ ⁇ 3.
• the CaO content in the cooled slag can be reduced.
• the slag temperature at the slag outlet of the cooling device at 100 or more, free water in the slag can be more reliably suppressed, and generation of strong alkaline water can be prevented.
• the large bullion in the slag is recovered before the cooling device such as a rotary cooler, the recovery efficiency of the bullion is increased and the large bullion prevents the cooling device from being damaged.
• the slag having a high temperature and low hardness is cooled while applying a drop impact for 10 minutes or more inside the rotor leak cooler. As a result, the slag tends to break apart and is more reliably destroyed than the conventional method of passing the crusher in a few seconds.
• the temperature of the slag charged inside the low evening leak is between 700 and 1250, the volume change due to the phase transformation peculiar to iron and slag containing CaO in the cooling process It can be used to cause crushing. For this reason, the crushing action by the drop impact and the crushing action by the phase transformation can proceed more efficiently.
• the slag residence time in the rotor leak cooler is 10 to 20 minutes, high-quality bullion can be recovered.
• Increasing the dwell time improves the crushing effect, but it is not preferable to exceed 20 minutes because the equipment becomes larger and the damage to the equipment increases and the running costs such as repair costs increase.
• by installing a vibrating screen and a magnetic separator on the exit side of the low leakage leaker it is possible to separate and recover iron bullion from crushed slag, and to obtain bullion with a high iron content. It is possible to obtain slag from which bullion is separated, which is advantageous for use as roadbed materials.
• FIG. 1 is an explanatory view showing an embodiment of the present invention.
• FIG. 2 is an explanatory view showing another embodiment of the present invention.
• FIG. 3 is a flowchart showing an example of the process of the present invention.
• FIG. 4 is an explanatory view showing still another embodiment of the present invention.
• FIG. 5 is a cross-sectional view of the rotary cooler used in the embodiment of the present invention.
• Figures 6 (A) to (D) are explanatory diagrams of a conventional slag treatment method.
• Fig. 7 is an explanatory diagram of the conventional slag treatment method (continuation of Fig. 6).
• FIG. 1 is an explanatory view showing an example of an embodiment of the present invention.
• a high-temperature molten slag 3 containing CaO is caused to flow from a slag pan 1 to a pit (yard) 2 and firstly cooled.
• the high-temperature slag to be treated in the present invention is steelmaking slag discharged from the furnace or pan or hot metal pretreatment slag. And hot metal desulfurization slag.
• the structure of the pit (yard) 2 that performs the primary cooling is not particularly limited, but here, a structure in which a steel slab with a thickness of 0.25 m is spread on the crushed stone layer is adopted. Yes.
• primary cooling can be performed using a cooling box. The hot slag is smoothed to a uniform thickness on the pit 2 and large lumps and bullion are removed. Cooling water is sprayed from the watering nozzle of the watering device 4 as long as free water is not generated. At this time, it is necessary for the sprayed cooling water to instantly evaporate and take the heat of vaporization from the slag so that it does not remain in the free water state.If free water is generated, alkali elution from the entire slag will occur.
• the slag temperature is lowered to about 700 to 1250.
• free water generation means that there is no water adhering to the surface and recesses of the slag.
• the sprayed water does not evaporate and remains on the surface or recesses of the slag. Make sure that it does not flow down to the bottom of the pit.
• the amount of sprinkling is set according to the amount and temperature of the slag, and the amount of sprinkling is adjusted according to the temperature change of the slag accompanying cooling.
• the slag after primary cooling is taken out from the pit (yard) 2 by an appropriate construction such as a power shovel or civil engineering equipment 8, and is inserted into the cooling device 10 of the high-temperature slag processing device to perform secondary cooling.
• a hopper 11 is installed in front of the cooling device 10, and a sieving grid called Dalysley 12 is installed in an inclined state on the upper surface of the hopper 11.
• the bulk metal bullion in the slag after primary cooling is separated by the grizzly 1 2 that is the grid for sieving, and only the small-diameter slag 7 'that passes through the grizzly 1 2 is cut out (vibration feeder 1) 1 3 Is put into the cooling device 1Q.
• cooling device 10 for secondary cooling various types can be used, but in the embodiment of FIG. 1, a single cooler 10 0 b is used.
• the casing 14 is usually a steel cylinder having a slag inlet 15 at one end and a slag outlet 16 at the other end, and is rotatably supported by a support roller 17. It can be rotated around its axis by a rotary drive (not shown).
• the cooling air spraying means 1 8 is installed so as to penetrate along the central axis of the casing 14, and the slag introduced into the interior by blowing cooling air from the cooling air spraying means 18. It is a cooler with a structure that cools the In the example of FIG. 1, as a preferred embodiment, cooling water supply means (external water spray pipe) 20 is also arranged on the outer periphery of the casing 14, and cooling water is injected from the cooling water supply means 20. As a result, the casing is cooled externally.
• the cooling water supply means 20 can have the same configuration as the cooling water supply means 19 described later.
• the hopper 1 1 provided with the grizzly 1 2 as described above is provided in the preceding stage of the slag loading inlet 15 of the cooling device 10 (1 0 a), and the high temperature A slag treatment device is configured.
• the slag that has become 7 0 0 to 1 2 5 0 due to the primary cooling is introduced from the hopper 11 at the upper end of the casing 14 and gradually moves in the direction of the slag discharge port 16 as the casing 14 rotates. go.
• FIG. 2 shows another embodiment of the invention.
• a cooling device 10 for secondary cooling in addition to such a rotary type cooling device, one end as shown in FIG. A cylindrical casing 14 with a slag inlet 15 at the other end, and a slag outlet 16 at the other end, a vibrating conveyor 2 3 extending in the axial direction of the casing having a diaphragm 24 inside thereof, and cooling air blowing
• a comparison type cooling device 1 Ob provided with attaching means 18 and cooling water supply means 19 described later.
• the cooling air blowing means 1 8 includes the cooling air supply pipe 1 8 a extending from the casing 14 along the axial direction of the casing 1 8 a to the branch pipe 1 8 b.
• the cooling air is supplied to the inside of the casing 14 via the slag, and the slag is conveyed in the direction of the slag discharge port 16 while flowing by the cooling air blown from below the diaphragm 2 4 of the conveyor 2 3. Go.
• the hopper 11 having the grizzly 12 is provided in the front stage of the slag loading inlet 15 of the cooling device 10 b (1 0), thereby constituting a high-temperature slag treatment device.
• a cooling water supply means 20 (not shown) outside the upper portion of the casing 14 of the cooling device 10 b as in the case of the cooling device 10 a.
• the cooling air blowing means 18 in these cooling devices 10 (10 0a, 10b) described above is provided with a cooling air pipe 18a, and the cooling air is supplied to the side facing the slag. As shown in FIG. 5, for example, as shown in FIG. It can be configured by providing at appropriate intervals along the hand direction.
• the cooling water supply means 19 of the cooling device 10 (10a, 10b) is provided with a cooling water supply pipe 19a along the axial direction of the casing, and is cooled on the side facing the slag.
• Water sprinkling holes 19 c see, for example, FIG. 2) or, alternatively, as shown in FIG. 5, for example, by providing sprinkling branch pipes 19 b at appropriate intervals along the axial direction of the casing. Is possible.
• the reason why the cooling device 10 (10a, 10b) is used in either case is that the water gasification reaction proceeds through the shift reaction by effectively utilizing the heat retained in the slag.
• the cooling device 10 it is possible to prevent the danger that CO generated by the water gasification reaction is released into the surrounding atmosphere.
• the cooling device 10 is used to perform the secondary cooling of the slag.
• the secondary cooling is water cooling in a range in which free water is not generated.
• the cooling water supply means 19 is disposed inside the cooling device 10 as described above, and water is sprayed on the slag moving inside the cooling device 10.
• the amount of water sprayed shall be vaporized at the moment when the hot slag and water spray come into contact with each other, so that free water is not generated.
• the slag is cooled to less than 30 Ot, preferably 2550.
• the amount of water sprinkled from the cooling water supply means is adjusted in consideration of changes in the amount of slag and temperature. In order to reliably prevent the generation of free water, it is preferable to maintain the slag temperature at the outlet of the cooling device 10 at 100 or higher.
• the slag that has been cooled down to 300 or less by the secondary cooling is discharged from the slag discharge port 16 of the cooling device to the compressor 2 2.
• the slag treated by the method of the present invention has a low CaO content, it can be used as a marine material for fishing reefs, for example, as it is or by being slightly carbonized.
• FIG. 3 is a diagram illustrating a work flow of the present invention
• FIG. 4 is an explanatory diagram illustrating an embodiment of the present invention
• FIG. 5 is a schematic diagram illustrating a cross section of a low leakage leaker.
• Hot metal pretreatment furnace, converter, electric High-temperature slag containing CaO from 120 to 1600 is discharged from a steelmaking process such as a furnace to the cooling pit or yard 2 by slag pan 1.
• the high-temperature slag is allowed to stand for a short period of about 10 to 30 minutes from the molten state until it becomes a high-temperature solid, and is primarily cooled. If there is a massive bullion, it is removed.
• Sprinkling during the primary cooling in the pit or yard 2 is not essential, but in order to efficiently cool and recover the metal, primary cooling including cooling with sprinkling of cooling water is performed.
• the solidified slag is dug up by a construction or civil engineering machine 8 and is put into a rotary cooler 110 a which is a cooling device through a hot bar 11. It is preferable to install a grid-like sieve called grizzly 1 2 at the entrance of the hopper 1 1, and collect the large bullion in the slag at the front stage of the mouth liqueur 1 0 a.
• the slag that has passed through the grizzly 1 2 is more than 5 0 0, preferably 7 0 0 to 1 2 5 0, more preferably 7 0 0 to 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
• a steel cylindrical casing 14 has a slag inlet 15 at one end and a slag outlet 16 at the other end, and is rotatably supported by a support port 1 7. (Not shown) can be rotated around the axis.
• protrusions 25 are provided on the inner surface of the casing (shell) 14.
• Slag loading inlet (inlet cover) 1 Slag inserted from 5 to casing (shell) 1 4 inside the casing (shell) 1 4 Repeated movement of falling when it is lifted as 4 rotates
• these protrusions 25 have the role of enhancing the drop impact effect.
• the shape of the projection 25 is arbitrary such as a plate shape, a square shape, a cylindrical shape, a round bar shape, a rail shape, an L shape, and an H shape, and may be a combination of these.
• Cylindrical casing (shell) 1 4 is provided with cooling water supply means (external sprinkler pipe) 2 0 1 9 outside, and casing (shell) 1 4 is cooled from the outside.
• the cooling water supply means 20 can have the same configuration as the cooling water supply means 19 described later.
• a cooling air blowing pipe 1 8 a extending in the axial direction of the casing is fixed as a cooling air blowing means 1 8 at the center of the casing (shell) 1 4, and cooling air is supplied from the air blowing fan 2 6. .
• the cooling air duct 19a is provided with a number of branch pipes 19b, and the cooling air is blown from the tip toward the slag. Its flow rate is, for example, 1 0 0 ⁇ 1 4 0 0 m 3 / min.
• casing (shell) 1 4 By rotating the casing (shell) 1 4 in this way, the slag is cooled by cooling air while being crushed by a drop impact. To do. Unlike slag cooled to room temperature, casing (shell)
• This rapid cooling can be performed only by the cooling air supply pipe 18 a of the cooling air supply means 18 and the branch pipe 18 b provided thereto, but in the embodiment of the present invention, the cooling air blowing means 18
• the cooling water supply pipe 19a as the cooling water supply means 19 is arranged below the cooling air pipe 18a as the cooling water supply pipe 19b. As shown in FIG. Cooling water is sprayed from b to enhance the rapid cooling effect.
• cooling water evaporates instantaneously upon contact with hot slag, and free water is not generated.
• a magnetic separator 3 1 is installed at the top of the competitor 22 and separates the metal from the crushed material.
• the slag that passed through the magnetic separator 31 is separated into large slag and small slag by the vibrating sieve 3 2.
• the metal recovered by the magnetic separator 31 is of high quality and stable at a level of 85% or more. Including iron Become the leading.
• the present invention since the slag is crushed inside the rotary cooler 110 a, a steam explosion or fire does not occur. In addition, it is possible to reliably suppress dust scattering without requiring excessive facilities and costs like a pressure vessel.
• the dust-containing gas generated inside the rotary cooler 10 a is sucked by the exhaust fan 29 and guided to the cyclone dust collector 21 via the exhaust duct 28 to be purified.
• the slag lump is not easily pulverized, and the amount of fine powder that is unsuitable for civil engineering is reduced.
• the primary cooled slag is put into the hopper and the bulk metal is separated and removed by Dalysley and supplied to a rotary cooler as shown in Fig. 1 with a diameter of about 2 m and a length of about 8 m. Secondary cooling was performed
• the slag temperature at the entrance of the slag installation of the overnight outlet is 8 5 0. Cooling air of 14 2 m 3 / hr was blown onto this slag, and it was air-cooled inside the low evening leaker.
• the outer surface of the rotary cooler is cooled by supplying 30 tons / h of cooling water, and 1 ton / hr of cooling water is sprinkled into the slag from the internal cooling water supply means to generate free water. Water cooling of the slag was performed within the range not to be allowed.
• the average residence time of the slag in the single cooler was 20 minutes.
• the slag cooled to about 2 2 0 is discharged from the slag outlet of the outlet / night leaker, and the temperature drop of the slag while passing through the outlet / outlet leaker is 6 3 0 Met.
• the slag is pulverized while being transported inside the rotary cooler, forming powder slag.
• the content of unreacted CaO contained in the original slag was 6-9%, and it dropped to 2.5-4% at the slag outlet of the Low Yu Leak.
• This slag is JIS -The expansion ratio required for roadbed materials at 5 0 1 5 was 1.5% or less.
• the present invention was carried out using 100 tons of steelmaking slag discharged from the steelmaking process.
• the slag temperature discharged from the furnace is in a molten state of about 140,000, and this is left to solidify for 20 minutes with a cooling pit as shown in Fig. Instead, water was cooled at 3.0 m 3 / hr for 5 minutes so as not to generate free water.
• this slag was dug up with a power shovel and put into a rotary cooler.
• the charging speed is 10 tons / hr, and the slag temperature at the time of charging is about 100 000.
• the casing (shell) of the mouth-tally cooler was rotated at 5 rpm, and the residence time of the slag was 20 minutes.
• the casing (shell) was supplied with 400 m 3 / min of cooling air and 5 m 3 / hr of cooling water. No free water was generated during this water cooling.
• the protrusion shown in Fig. 5 is formed inside the casing (shell), and the slag is crushed by the crushing action caused by the drop impact and the crushing action caused by the rapid cooling, and is about lo ot: from the casing (shell). It was discharged. The discharged material was passed through a magnetic separator and the bullion was collected.
• the high-temperature slag treatment method of the present invention the high-temperature slag is primarily cooled, and then the secondary cooling is performed while moving inside the cooling device. This eliminates the need for a huge dust collector.
• cooling is performed without bringing the slag into contact with free water, strong alkaline water is not generated in the treatment process, and the apparatus does not corrode.
• a forced cooling system using water cooling it does not require a long time for processing.
• the bullion recovered by the magnetic separator is at a level of 85% or more. High quality with stable iron content.
• the slag is cooled and crushed mainly in the cooling device, no steam explosion or fire occurs.
• it is possible to reliably suppress dust scattering without requiring excessive facilities and costs like a pressure vessel.

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• 2008
  • 2008-11-25 WO PCT/JP2008/071756 patent/WO2009069794A1/ja active Application Filing
  • 2008-11-25 TW TW097145501A patent/TW200936771A/zh unknown
  • 2008-11-25 BR BRPI0819855A patent/BRPI0819855B1/pt not_active IP Right Cessation
  • 2008-11-25 CN CN200880117836.2A patent/CN101874121B/zh active Active

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