Classifications

• • 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
  • 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
  • C21B2400/062—Jet nozzles or pressurised fluids for cooling, fragmenting or atomising 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
  • C21B2400/05—Apparatus features
  • C21B2400/066—Receptacle features where the slag is treated
  • C21B2400/072—Tanks to collect the slag, e.g. water tank

Definitions

• the present invention relates to a device for wet granulation of liquid slag.
• a liquid slag stream is introduced into a powerful water stream, the liquid slag caught by the water stream being granulated, solidified and cooled. The granules are then dewatered.
• Devices for wet granulation of liquid slag are known, for example, from the blast furnace sector. They include a pelletizing basin with a spraying device for the pelletizing water and a device for dewatering the pellet.
• Classic dewatering devices include a decanting basin, separated from the granulating basin, in which the slag granulate settles.
• the present invention has for its object a simple and at the same time to create a very compact device for wet granulation of liquid slag. This object is achieved according to the invention by a device according to claim 1.
• the device according to the invention for the wet granulation of liquid slag comprises a granulating basin with an injection device for the granulating water, a decanting basin separated from the granulating basin, in which the slag settles as granulate, and a device for introducing the granulate-water mixture from the granulating basin into the decanting basin .
• This device comprises at least one elongated distribution channel which extends over the decanting basin and has on its underside distributed outflow means for the granulate / water mixture over its length.
• These outflow means can comprise, for example, one outflow slot or a plurality of outflow openings arranged one behind the other.
• a vertical, downwardly open inflow shaft is arranged below the at least one distribution channel, into which the outflow means for the pellet-water mixture open.
• This inflow shaft can be formed in a simple manner, for example, by two screen walls attached to the distribution channel.
• the granulate-water mixture can be introduced into the decanting basin largely without turbulence through the distribution channel, its outflow means and the inflow shaft. This ensures that the slag granulate settles satisfactorily even in relatively small decanting tanks.
• the present invention thus makes it possible to create a compact device for wet granulation of liquid slag with extremely simple means.
• the decanting basin advantageously has overflow devices for the granulating water at its upper edge.
• the "clarified" pelletizing water, during the pelletizing, is removed from the decanting basin via these overflow devices and, if necessary, returned to the injection device in the decanting basin.
• the distribution channel is lower than these overflow devices and consequently below the water level in the Decanting basin.
• this basin advantageously has at least one funnel-shaped depression with an outflow nozzle and a shut-off valve for closing the outflow nozzle.
• the use of space in the decanting basin is optimized in that the inflow shaft and the at least one funnel-shaped depression have a common plane of symmetry.
• a particularly compact device can be achieved in that the granulating basin has a plurality of funnel-shaped depressions one behind the other, the inflow shaft and the funnel-shaped depressions lying one behind the other having a common plane of symmetry
• the pelletizing tank is advantageously designed as an elongated trough with a bottom surface, two side surfaces and two end surfaces.
• the injection device for the pelletizing water is arranged at a first end of this trough, and the at least one distributor channel forms its opening into the pelletizing tank at the opposite end of the trough.
• the injection device for the granulating water comprises a chamber which encloses the first end of the tub and
• Granulating water is preferably arranged both in the two side surfaces and in the end surface at the first end of the tub.
• FIG. 1 shows a longitudinal section through a device according to the invention for wet granulation of liquid slag, with a slag pan in the emptying position; 2 shows a plan view of the device of FIG. 1, without slag pans; and FIG. 3: a cross section along the section line AA through the device of FIG. 1.
• reference number 10 denotes a slag pan with liquid slag, which is to be granulated in a granulating device 12 according to the invention.
• This granulating device 12 essentially consists of a granulating basin 14 and a decanting basin 16 which is directly attached to the granulating basin 14.
• the shown granulating device 12 further comprises a swiveling device 18 for emptying the slag pan 10 into the granulating tank 14.
• the swiveling device 18 grips the slag pan 10 on its bearing journal 20 and swivels it about a swiveling axis 22 into a dispensing position above the rear end of the granulating tank 14, so that the liquid slag can enter the granulating tank 14.
• the angle of inclination of the pan 10 is adjusted in such a way that a stream of slag which is as constant as possible flows into the granulating tank 14.
• the granulating basin 14 is formed by an elongated trough which has a bottom surface 24, two side surfaces 26, 28, and a rear end surface 30 and a front end surface 32.
• the liquid slag flows from the slag pan 10 into the rear end of the granulating basin 14.
• an injection device for the granulating water is built into the tub. This injection device comprises a water chamber 34 which surrounds the rear end face 30 and the rear section of the two side faces 26 and 28.
• the water chamber 34 is charged with the pelletizing water via connecting pieces 35.
• the pelletizing water flows out of the water chamber 34 into the elongated trough of the pelletizing tank through a plurality of outlet openings 36 in the end face 30 and the two side faces 26 and 28.
• An inflow velocity of approximately 10 m / s should be achieved at the outlet openings 36.
• About 15 kg of water should be injected into the granulating basin 14 per kg of liquid slag.
• the liquid slag is caught by the granulating water stream, where it granulates and solidifies.
• the granulating basin 14 is connected to the decanting basin 16 via a device for introducing the granulate-water mixture into the decanting basin 16, which is designated globally in the figures with the reference symbol 38.
• This device 38 comprises at least one tubular distribution channel 40 which extends over the decanting basin 16 in the longitudinal direction thereof.
• this distribution channel 40 has outflow means 42 for the granulate-water mixture, which are distributed over the length of the decanting basin 16.
• These outflow means 42 can comprise, for example, one or more outflow slots and / or several outflow openings arranged one behind the other.
• the outflow means 42 should be designed in such a way that the granulate-water flow from the granulating basin through the distribution channel 40 is distributed as uniformly as possible over the entire length of the decanting basin 16. It should be noted that the distribution channel 14 is laid with a slope, the upper end in the front end wall 32 of the granulating basin 14, immediately above the bottom surface 24, forming an opening 44 for the granulate-water flow.
• the lower end of the distribution channel 14 is closed and lies on a support base 45 on the decanting basin 16.
• the granulating basin 14 comprises an overflow 46 on its front end wall 32, which is also connected to the distribution channel 14 by means of an overflow pipe 48.
• shield walls 50, 52 are attached on both sides of the distribution channel, which extend into the decanting basin 16 to far below the outflow means 42 in the distribution channel 40.
• These screen walls 50, 52 form below the distribution channel 40 a downwardly open vertical inflow shaft 54, into which the outflow means 42 for the granulate-water mixture open.
• the granulate water Mixture be introduced into the decanting basin 16 largely without turbulence. This ensures that the slag granulate settles satisfactorily in the relatively small decanting basin 16.
• the decanting basin 16 has an overflow channel 56 for the granulating water at its upper edge.
• the "clarified” granulating water is discharged from the decanting basin 16 via this overflow channel 56 during the granulation. It was noted that the distribution channel 40 lies lower and consequently below the water level 58 in the decanting basin 16.
• the device according to the invention for introducing the granulate-water mixture into the decanting basin 16 described above ensures that most of the granulate particles settle in the decanting basin 16 before the granulating water flows into the peripheral overflow channel 56.
• the "clarified” granulating water can be fed back into the injection device of the granulating basin 14 from the overflow channel.
• the latter For the removal of the granulate from the granulating basin 16, the latter has two funnel-shaped depressions 60, 62 in its bottom surface, each with an outflow nozzle 64, 66 and a shut-off valve 68, 70 for closing the outflow nozzle.
• the granulate collects in these depressions 60, 62 and can be removed by opening the shut-off valves 68, 70.
• the shut-off valves 68, 70 are preferably pinch valves, i.e. Valves with a membrane which surrounds a through-channel in the valve and constricts this through-channel when a pressure medium is applied to it.
• a filter connection 72, 74 is arranged in front of each of the shut-off valves 68, 70, via which the decanting basin 16 is dewatered before the granulate is removed. Due to its simplicity and compactness, the described granulating device 12 is particularly well suited for use in an electrical steelworks. It is advantageous here that the electroslag has a relatively high specific weight and consequently settles well in the decanting basin.

Landscapes

• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Manufacturing & Machinery (AREA)
• Materials Engineering (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• Furnace Details (AREA)
• Manufacture Of Iron (AREA)
• Curing Cements, Concrete, And Artificial Stone (AREA)
• Processing Of Solid Wastes (AREA)

Priority Applications (8)

Applications Claiming Priority (2)

Publications (1)

Family

ID=19731754

Family Applications (1)

Country Status (14)

Cited By (3)

Families Citing this family (4)

Citations (4)

• 1998
  • 1998-06-26 LU LU90255A patent/LU90255B1/de active
  • 1998-11-11 TW TW087118750A patent/TW426549B/zh not_active IP Right Cessation
• 1999
  • 1999-06-15 JP JP2000557002A patent/JP2003520290A/ja active Pending
  • 1999-06-15 CN CN998073504A patent/CN1218052C/zh not_active Expired - Fee Related
  • 1999-06-15 BR BR9911391-0A patent/BR9911391A/pt not_active IP Right Cessation
  • 1999-06-15 US US09/720,138 patent/US6516632B1/en not_active Expired - Fee Related
  • 1999-06-15 AT AT99929210T patent/ATE231923T1/de active
  • 1999-06-15 CA CA002334197A patent/CA2334197C/en not_active Expired - Fee Related
  • 1999-06-15 ES ES99929210T patent/ES2191439T3/es not_active Expired - Lifetime
  • 1999-06-15 AU AU46103/99A patent/AU743721B2/en not_active Ceased
  • 1999-06-15 WO PCT/EP1999/004111 patent/WO2000000649A1/de not_active Ceased
  • 1999-06-15 DE DE59904173T patent/DE59904173D1/de not_active Expired - Lifetime
  • 1999-06-15 EP EP99929210A patent/EP1097245B1/de not_active Expired - Lifetime
• 2000
  • 2000-12-20 ZA ZA200007698A patent/ZA200007698B/en unknown

Patent Citations (4)

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