Classifications

• • C—CHEMISTRY; METALLURGY
  • C21—METALLURGY OF IRON
  • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
  • C21C1/00—Refining of pig-iron; Cast iron
  • C21C1/02—Dephosphorising or desulfurising
• • C—CHEMISTRY; METALLURGY
  • C21—METALLURGY OF IRON
  • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
  • C21C1/00—Refining of pig-iron; Cast iron
  • C21C1/10—Making spheroidal graphite cast-iron
• • C—CHEMISTRY; METALLURGY
  • C21—METALLURGY OF IRON
  • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
  • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00

Definitions

• the present invention relates to an immersion evaporation chamber for introducing vaporizable additives into a melt, in particular pure magnesium, into a pig iron, cast iron or steel melt in a treatment vessel for desulfurization and / or for the production of cast iron with spheroidal graphite or vermicular graphite or magnesium-treated Te perguss.
• the immersion bulb made famous by DAS 2208960 for introducing magnesium into a melt is structurally complicated and complex.
• the arrangement shown allows only a slight utilization of the stirring effect produced by the kinetic energy of the steam emerging from this immersion bulb, combined with an intensive rinsing effect in the melt.
• the pressure changes (control vibration test) generated by the controlled evaporation in the chamber and thus also the escaping steam are to be largely reduced.
• Fer ⁇ ner the diving evaporation chamber should be simple constructive tion in the Kon ⁇ , production and be in use and as necessary as reusable chamber or only when his workedbiluet ⁇ "disposable chamber".
• a ratio of the total cross sections of the upper and lower opening, or openings _o ⁇ .2, has proven to be optimal
• a conventional treatment vessel e.g. a transport pan for the melt, which is lined with refractory material, is filled with melt.
• melt This can be cast iron, pig iron or steel melt.
• An immersion evaporation chamber according to the invention is immersed in the melt at a predetermined speed.
• This chamber is connected to a filling and holding tube.
• the chamber is either immersed in the melt through an opening in the easily removable lid of the treatment vessel, the filling and holding tube being able to be provided with a stop which is seated in a holder on the lid, or with the lid easily attached to the holding tube .
• the frictional connection of the buoyancy, evaporation and reaction forces acting on the chamber can or only via the immersion device and the cover of the treatment vessel can be reached via the diving device or the cover.
• the interior of the chamber is filled with pure magnesium, for example.
• the pure magnesium can be introduced into the chamber in lump or liquid form.
• the inner and outer shape of the chamber is selected and dimensioned according to flow-technical criteria with regard to steam and bath flow.
• the chamber is preferably immersed into the melt in an eccentric position with respect to the vertical central axis of the treatment vessel because of the criteria just mentioned and in order to make optimum use of the stirring effect which occurs when the magnesium vapors are mixed with the melt.
• the eccentric position of the chamber in the treatment vessel and / or the openings arranged eccentrically on the chamber support and reinforce the bath rotation and thus the flushing action and thus the separation of the reaction products, such as e.g. Slag.
• the openings provided in the chamber wall are arranged on at least two levels with regard to the installation position and can differ in their number and in their total cross-sectional area.
• the number, size and arrangement of the openings in the chamber wall are selected such that an optimal course of the evaporation of the re-magnesium in the chamber and the reaction of the steam with the melt is ensured. In this way, controlled, metered evaporation of the pure magnesium and thus a reaction process controlled within narrow limits is achieved.
• the total cross section Q of the opening or openings is preferably smaller than the total cross section Q of the opening or openings in the upper two thirds of the chamber wall.
• the number and size of the openings and the distance between the opening levels depend on various factors, such as, for example, the amount, the sulfur content and the treatment temperature of the melt to be treated.
• the chamber is connected to a filling and holding tube which protrudes through the protective cover of the treatment vessel.
• This tube can be covered with a refractory layer, preferably made of ceramic material, on the outside or inside or on both sides of part or all of the length protruding from the reaction chamber.
• the vertical axes of the holding or filling tube can coincide or be arranged offset.
• the holding and / or filler pipe can execute a rotating and / or pulsating movement, whereby three rotating movements and / or one vertical pulsation can be combined.
• the rotational and / or pulsating movement (s) of the immersion evaporation chamber enables an optimal mixing of the steam emerging from the chamber with the melt and thus the highest possible efficiency with the best possible reproducibility of the melt treatment.
• the protective cover has a collar-shaped jacket projecting downwards along the outside of the treatment vessel wall.
• OMPI which serves as a splash guard.
• One or more outlet openings for vapors that are not absorbed by the melt or that are released by the melt can be provided in the protective cover itself.
• the length of the jacket must be chosen so that the bottom edge of the jacket covers the top edge of the treatment vessel before the chamber is immersed in the melt.
• the hood-shaped cover can also be used directly for suction of the above-mentioned vapors and their reaction products with the air, for example MgO, by the above-mentioned outlet opening (s) directly with one or more suction line (s), for example via one or more flexible metal pipes can be connected.
• the chamber can also be designed as a disposable chamber in such a way that, after the evaporation has ended, the chamber completely or partially detaches from the holder and exits the melt as a unit or disintegrated.
• the chamber can also have two or more parts be, with a two-part design, a lower part of the container after it has been filled with magnesium is attached to a cover part which is connected to a stem, for example by means of a simple screw cap.
• a filler pipe of the type described above is superfluous and can be replaced by a simple handle.
• the chamber is filled with liquid magnesia, e.g. through one or more openings in the wall of the chamber and after the magnesium has solidified, it can be immersed in the melt, because of the more favorable volume-surface ratio of the piece of magnesium solidified in the chamber than in the case of lumpy magnesium, a quieter reaction course can be observed.
• a finer dosage of the filling weight of the magnesium is possible and the filling tube in the holding handle of the chamber is no longer required.
• the walls of the chamber can be made of conventional or high-strength refractory materials or combinations of materials
• the treatment sequence can be increased considerably, since the treatment device is better adapted to the operational conditions with regard to the previously known immersion devices and its handling is simplified .

Landscapes

• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• Manufacture And Refinement Of Metals (AREA)
• Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
• Treatment Of Steel In Its Molten State (AREA)
• Cylinder Crankcases Of Internal Combustion Engines (AREA)
• Removal Of Specific Substances (AREA)

Applications Claiming Priority (2)

Publications (1)

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• 1981
  • 1981-05-08 CH CH2990/81A patent/CH656399A5/de not_active IP Right Cessation
• 1982
  • 1982-04-15 CA CA000401061A patent/CA1194698A/en not_active Expired
  • 1982-04-23 IL IL65587A patent/IL65587A/xx unknown
  • 1982-04-26 PT PT74800A patent/PT74800B/pt unknown
  • 1982-04-26 YU YU00891/82A patent/YU89182A/xx unknown
  • 1982-04-26 PH PH27193A patent/PH19358A/en unknown
  • 1982-04-28 AR AR289243A patent/AR228491A1/es active
  • 1982-04-29 IT IT20993/82A patent/IT1151385B/it active
  • 1982-05-04 US US06/459,539 patent/US4496393A/en not_active Expired - Fee Related
  • 1982-05-04 BR BR8207694A patent/BR8207694A/pt unknown
  • 1982-05-04 WO PCT/CH1982/000065 patent/WO1982003875A1/de not_active Ceased
  • 1982-05-04 HU HU821838A patent/HU191461B/hu unknown
  • 1982-05-04 EP EP82901349A patent/EP0078277A1/de not_active Withdrawn
  • 1982-05-04 JP JP57501439A patent/JPS58500667A/ja active Pending
  • 1982-05-04 AU AU83939/82A patent/AU551528B2/en not_active Expired - Fee Related
  • 1982-05-06 DD DD82239638A patent/DD202454A5/de unknown
  • 1982-05-06 PL PL23632382A patent/PL236323A1/xx unknown
  • 1982-05-07 ES ES511987A patent/ES511987A0/es active Granted
  • 1982-05-07 ZA ZA823161A patent/ZA823161B/xx unknown
• 1983
  • 1983-01-06 SU SU833532671A patent/SU1232149A3/ru active
  • 1983-01-06 RO RO83109626A patent/RO88051A/ro unknown
  • 1983-01-07 DK DK0048/83A patent/DK4883D0/da not_active Application Discontinuation
  • 1983-01-07 NO NO830038A patent/NO830038L/no unknown

Non-Patent Citations (1)

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