CN103146867A - External molten iron desulphurization method - Google Patents
External molten iron desulphurization method Download PDFInfo
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- CN103146867A CN103146867A CN 201310066878 CN201310066878A CN103146867A CN 103146867 A CN103146867 A CN 103146867A CN 201310066878 CN201310066878 CN 201310066878 CN 201310066878 A CN201310066878 A CN 201310066878A CN 103146867 A CN103146867 A CN 103146867A
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Abstract
The invention relates to an external molten iron desulphurization method. The external molten iron desulphurization method is characterized by comprising the following steps of: preparing an integral magnesium brick alloy desulphurizer by adopting a chemical composition of a binary magnesium-silicon alloy containing 5-30% of silicon and the balance of magnesium and a manner that liquid alloy is poured into an integral magnesium brick alloy desulphurizer lined by a square steel tube outside or granular powdery magnesium-silicon alloy is compacted into the integral magnesium brick alloy desulphurizer in the square steel tube by utilizing a press machine, so as to obtain the integral magnesium brick alloy desulphurizer which is lined by the square steel tube outside and open at two ends, wherein a metal magnesium block desulphurizer which is lined by the square steel pipe and a refractory material can also be prepared, and placing the desulphurizer into a molten iron ladle with a reaction chamber to carry out desulphurization. The external molten iron desulphurization method provided by the invention overcomes the defects of the traditional process adopting magnesium powder for desulphurization, a reaction is extremely stable, no smoke dust or magnesium light is produced, absorption rate of effective elements is high, molten iron is slightly cooled, and desulphurization cost is low.
Description
Technical field
The invention belongs to molten iron furnace and give processing technology field outward, the improvement of desulphurization technological process.Specifically to utilize the rectangular steel tube of two end openings to be built-in with silicon content be 5～30% surpluses carries out for sweetening agent coordinates the desulfurization treatment unit method that desulfurization is processed for the mg-si master alloy of magnesium or the metal MAG block of outer lining rectangular steel tube and refractory materials.
Background technology
Carry out with Mg-base desulfurizing agent the technique that the iron and steel deep desulfuration is processed, in the fifties USSR (Union of Soviet Socialist Republics) in advance, the middle nineteen seventies American has invented the technical matters that composite blowing CaO+Mg powder desulfurization is processed, its technology and equipment are gradually improved afterwards, the eighties in the North America, West Europe and the nineties widely use in Japan and other countries.
USSR (Union of Soviet Socialist Republics) is produced malleable iron in nineteen fifty with the magnesium desulfurization, mix with 70 proportioning by 30 with lime powder with the magnesium powder beginning of the seventies at the end of the sixties and carry out industrial production, after 1973, (granularity 0.5～1.6mm) replaces the magnesium powder, adopts more advanced magnesium grain blowing device to carry out the desulfurization processing in 1978～1979 with villaumite coating magnesium grain.
Sulphur is one of detrimental impurity in iron and steel, it affects red brittleness, the physical strength of material, sulphur content in most of steel grades is 0.015～0.045%, development along with science and technology, sulphur content in the high-quality steel realized＜0.005%, and what have has reached 0.003～0.001% sulphur content.
Chinese invention patent Granted publication CN100419091C denomination of invention is a kind of for " external desulfurization method for molten iron by magnesium bar " discloses to be fixed on the magnesium rod on desulfurization rifle body; under the protection of cooling (the cooling gun body) of cooling system and rare gas element; the magnesium rod is inserted in iron ladle; carrying out desulfurization processes; when the magnesium rod in the desulfurization rifle is less than 20～30mm; the magnesium rod that more renews, above step repeatedly proceeds to sweetening process and finishes.The external desulfurization method for molten iron that foregoing invention provides has overcome the shortcoming of conventional art magnesium powder sulfur removal technology, and novel method is with low cost, and is easy and simple to handle, and the magnesium rod can quick-replaceable, can also make desulfurization more complete simultaneously.
In published molten iron desulfurizing method, that form with pure magnesium or the multiple layer of pure magnesium exists as the principal element MAGNESIUM METAL of desulfurization, the fusing point of magnesium is 651 ℃, 1107 ℃ of boiling points, can produce chemical reaction with other elements after its fusing, seek a kind of facility investment few, easy and simple to handle, cost is cheaper, the method that sweetening effectiveness is good.
Summary of the invention
The treatment process that the purpose of this invention is to provide the outer desulfurizing iron of a kind of stove coordinates the desulfurization treatment unit to realize that molten iron gives desulfurization and processes, and processing reaction is steady, and the effective element specific absorption is high, reduces production costs.
Learnt by magnesium silicon binary phase diagram: when silicon content is that 5% surplus is approximately 800 ℃ of its fusing points of magnesium silicon binary alloy of magnesium; When silicon content is that 10% surplus is approximately 930 ℃ of its fusing points of magnesium silicon binary alloy of magnesium; When silicon content is that 20% surplus is approximately 1020 ℃ of its fusing points of magnesium silicon binary alloy of magnesium; When silicon content is that 36.59% surplus is magnesium silicon binary alloy magnesium and the silicon formation compound Mg of magnesium
2Approximately 1102 ℃ of its fusing points of Si; Mg
2Si and Mg form eutectic, and be siliceous 1.4%, and eutectic temperature is 637.6 ℃, Mg
2Si and Si also can form eutectic, and be siliceous 58%, and its eutectic temperature is 950 ℃.According to the characteristic of magnesium silicon binary alloy, select silicon content at the mg-si master alloy of 5%～30% composition, its fusing point can be risen to 800 ℃～1090 ℃ by 651 ℃ of pure magnesium.Be the component segregation that prevents that the magnesium silicon binary alloy from producing when the cooled and solidified, cause the silicon content of alloy part to cause the fusing point of alloy to begin to reduce by 1102 ℃ after 36.59%, and after the raising of silicon content, magnesium content will decrease, when equal mg-si master alloy weight, its effective element Mg content is lowered, and the subsidiary silicon content that adds is also influential and increased the cost of desulfurization to the technical requirements of producing material in addition, therefore sets silicon content in the magnesium silicon binary alloy≤30%.
concrete technical scheme of the present invention is as follows: utilize rectangular steel tube to offer several pressure regulation through holes or pressure regulation seam on the middle part of its two corresponding sides, the chemical composition of the required weight of molten iron being processed in desulfurization according to the weight of molten iron that is desulfurized processing and chemical composition is that the dibasic magnesium silicon alloy liquid that siliceous 5～30% surpluses are magnesium is poured in rectangular steel tube, until its solidify cooling after, just obtained the outer lining rectangular steel tube, the whole magnesium silicon sweetening agent of both ends open, for further controlling the speed of response of mg-si master alloy in rectangular steel tube, the steel plate that employing equates with the rectangular steel tube wall thickness is with the part of the mode shutoff rectangular steel tube both ends open of welding, to reduce high temperature liquid iron with the contact surface of mg-si master alloy, control time and the response behaviour of desulphurization reaction.Learnt by test, the outer lining rectangular steel tube is in the desulfurizing iron reaction process of 1280 ℃～1350 ℃, guaranteed the uniform continuity of its reaction process, the time of desulphurization reaction and response behaviour select the chemical composition of mg-si master alloy and the scantlings of the structure of rectangular steel tube to determine according to need of production.
The mg-si master alloy of cast in the outer lining rectangular steel tube, the block mg-si master alloy that also can select first will to melt be broken into＜the granular powder powder of 3mm, then it is packed into offer in the outer lining rectangular steel tube of regulator hole, pressure regulation seam, forming with the pressing machine compacting.In order further to reduce the cost of mg-si master alloy, adopting 75 ferrosilicon to replace Pure Silicon Metals, making silicon content 5%～30% surplus is that the magnesium ferrosilicon ternary alloy of magnesium and the 75 ferrosilicon iron-holder of bringing into is the sweetening agent in the outer lining rectangular steel tube.
desulfurization treatment unit: it is characterized in that in the bottom of hot metal ladle by dykes and dams top the first refractory brick and dykes and dams top the second refractory brick and dykes and dams tops the 3rd refractory brick, be provided with the dykes and dams lower floors refractory brick in lower reaction mouthful and middle reaction gap, the dykes and dams of dykes and dams lower floor the first refractory brick and dykes and dams lower floors the second laying fireproof bricks, the middle part is provided with the dykes and dams lower floors refractory brick in lower reaction mouthful and middle reaction gap at the bottom of hot metal ladle, dykes and dams lower floor's the first refractory brick that its two ends are built by laying bricks or stones and dykes and dams lower floors the second refractory brick are fixed, built dykes and dams tops the first refractory brick by laying bricks or stones in the dykes and dams lower floor's refractory brick upper end that is provided with lower reaction mouthful and middle reaction gap, its two ends are fixed by dykes and dams top the second refractory brick and dykes and dams tops the 3rd refractory brick, the step shape that protrude for its reaction chamber lower inside at the position that dykes and dams top the second refractory brick contacts with neighbour the second upper cover refractory brick, the step shape that protrude for its reaction chamber lower inside at the position that dykes and dams top the 3rd refractory brick contacts with neighbour the first upper cover refractory brick, the step shape that the step shape that protrude above for its end at the second upper cover refractory brick and the position that neighbour dykes and dams tops the second refractory brick contacts and dykes and dams tops the second refractory brick reaction chamber lower inside are protruded matches, the second upper cover refractory brick equates with the apical side height of dykes and dams tops the second refractory brick, the step shape that the step shape that protrude above for its end at the first upper cover refractory brick and the position that neighbour dykes and dams tops the 3rd refractory brick contacts and dykes and dams tops the 3rd refractory brick reaction chamber lower inside are protruded matches, and the first upper cover refractory brick equates with the apical side height of dykes and dams tops the 3rd refractory brick, the position that the first upper cover refractory brick contacts with neighbour the second refractory brick and the second wedge shape refractory brick is its step shape that protrudes below, the position that the second refractory brick contacts with neighbour the first upper cover refractory brick is that the step shape that the step shape that protrudes above of the second refractory brick end and the first upper cover refractory brick protrude below matches, and the second refractory brick equates with the apical side height of neighbour the first upper cover refractory brick, the position that the second upper cover refractory brick contacts with neighbour the second refractory brick and the second wedge shape refractory brick is its step shape that protrudes below, the position that the second refractory brick contacts with neighbour the 2nd, upper cover refractory brick is that the step shape that the step shape that protrudes above of the second refractory brick end and the second upper cover refractory brick protrude below matches, and the second refractory brick equates with the apical side height of neighbour the second upper cover refractory brick, the second band steel and the second iron wire are welded into the top that the right angle is suspended on the second refractory brick, with the second wedge shape refractory brick large plane one end down, its faceted end up, insert between the first upper cover refractory brick and the second upper cover refractory brick, leave the free gap between the lower end of the second wedge shape refractory brick and the first upper cover refractory brick and the second upper cover refractory brick, the large plane of the second wedge shape refractory brick lower end is concordant with the bottom surface of the first upper cover refractory brick and the second upper cover refractory brick, accompany the second band steel between the second wedge shape refractory brick and the second refractory brick, the first band steel and the first iron wire are welded into the top that the right angle is suspended on the first refractory brick reaction chamber inboard, dykes and dams tops, with the first wedge shape refractory brick facet one end down, one end on its large plane up, insert between the second wedge shape refractory brick and dykes and dams tops the first refractory brick, accompany the first band steel between the first wedge shape refractory brick and dykes and dams tops the first refractory brick, all leave the upper reaction gap of up/down perforation between the first wedge shape refractory brick and the first upper cover refractory brick and the second upper cover refractory brick, be provided with semicircular refractory brick in the reaction chamber of hot metal ladle, semicircular refractory brick and dykes and dams top the second refractory brick and dykes and dams tops the 3rd laying fireproof bricks are together, neighbour the second upper cover laying fireproof bricks of the 3rd upper cover refractory brick is on dykes and dams top the second refractory brick and semicircular refractory brick, neighbour the first upper cover laying fireproof bricks of the 4th upper cover refractory brick is on dykes and dams top the 3rd refractory brick and semicircular refractory brick, the overhead height of the step shape that the end face of semicircular refractory brick protrudes lower than dykes and dams tops the 3rd refractory brick reaction chamber lower inside, the overhead height of the step shape that the end face of semicircular refractory brick protrudes lower than dykes and dams tops the second refractory brick reaction chamber lower inside, dykes and dams top the first refractory brick and dykes and dams top the second refractory brick and dykes and dams tops the 3rd refractory brick overhead height are concordant, in above-mentioned reaction chamber of building by laying bricks or stones except the first wedge shape refractory brick and the second wedge shape refractory brick other refractory brick be fixedly and build by laying bricks or stones, will be used for desulfurization after the foundry ladle drying that construct and process, be provided with the funnel-form that matches with the desulphurised hot metal pack processing in the upper end of desulfurizing iron bag and cover clad, the degree of depth of funnel-form covering clad should guarantee to be desulfurized the processing molten iron and not splash when pouring fast.
Its treatment step is as follows:
a, the whole mg-si master alloy sweetening agent of outer lining rectangular steel tube of preparation is on request put in the reaction chamber of hot metal ladle, the subassembly of the first band steel and the first iron wire welding is suspended on the top of the first refractory brick reaction chamber inboard, dykes and dams tops, the subassembly of the second band steel and the welding of the second iron wire is suspended on the top of the second refractory brick, with the second refractory brick near the second wedge shape refractory brick, large plane one end of the second wedge shape refractory brick down, its faceted end up, insert between the first upper cover refractory brick and the second upper cover refractory brick, with the first wedge shape refractory brick facet one end down, one end on its large plane up, insert push-tight between the second wedge shape refractory brick and dykes and dams tops the first refractory brick,
B, funnel-form is covered clad be placed on hot metal ladle;
C, molten iron cover clad by funnel-form and pour hot metal ladle and carry out desulphurization reaction, space input protection of inert gas in the top of desulphurised hot metal bag simultaneously;
After d, desulphurization reaction finish, funnel-form is covered clad and hang away, the first wedge shape refractory brick that will float and the second wedge shape refractory brick take out;
E, will be desulfurized the molten iron of processing after skimming and leave the desulphurisation treater position, be transported to the subsequent processing link.
adopting silicon content 5%～30% surplus is the chemical composition scope of the dibasic magnesium silicon alloy of magnesium, the liquid alloy of mentioned component is poured into the whole mg-si master alloy sweetening agent of outer lining rectangular steel tube and the granular powder powder mg-si master alloy of mentioned component is compacted to the mode of the whole mg-si master alloy sweetening agent in rectangular steel tube with pressing machine, just obtained the outer lining rectangular steel tube, the whole mg-si master alloy sweetening agent of both ends open, the whole mg-si master alloy sweetening agent of above-mentioned outer lining rectangular steel tube is bound up on the bottom surface of pole pressure head with iron wire and iron sheet, offer regulator hole or pressure regulation seam corresponding two sides on the outer lining rectangular steel tube all perpendicular with the bottom surface of pole pressure head, the desulfurization pack processing that processing molten iron to be desulfurization is housed is on the ground motionless, connecting the pole pressure head of whole mg-si master alloy sweetening agent of outer lining rectangular steel tube and the covering clad that pole pressure head upper end is provided with sky coupler head suspension hook, carry out the desulfurization processing in the mode that its gravity is pressed in hot metal ladle.
Adopting silicon content 5%～30% surplus is the dibasic magnesium silicon alloy of magnesium, is processed into the granular powder powder of granularity＜3mm, utilizes magnesium powder blowing device to carry out desulfurization and processes.
Adopt 75 ferrosilicon to replace Pure Silicon Metals, make the magnesium ferrosilicon ternary alloy that silicon content 5%～30% surplus is magnesium and the 75 ferrosilicon iron-holder of bringing into, be processed into the granular powder powder of granularity＜3mm, utilize magnesium powder blowing device to carry out desulfurization and process.
Rectangular parallelepiped metal MAG block is placed in the outer lining rectangular steel tube of both ends open, is isolated by the refractory materials of consolidation between rectangular parallelepiped metal MAG block and outer lining rectangular steel tube.Take the rectangular parallelepiped metal MAG block of the refractory materials of outer lining rectangular steel tube and consolidation as sweetening agent is placed in the hot metal ladle reaction chamber, adopt above-mentioned treatment step to carry out desulfurization and process.The length of refractory materials of adjusting the size of the area of exposed metal MAG block and outer lining rectangular steel tube and increasing length, outer lining rectangular steel tube and the consolidation of metal MAG block can extend the time of molten iron reaction effectively.Can realize smokeless desulfurization processing by experiment experience proof aforesaid method for many years.
Beneficial effect of the present invention: solved the shortcoming that traditional technology adopts the desulfurization of magnesium powder to process, reacted very steady, the smoke dust magnesium light, the effective element specific absorption is high, and the molten iron cooling is few, and the desulfurization processing cost is low.
Description of drawings:
Fig. 1 is pack into the sectional view of the hot metal ladle of building the chamber that responds by laying bricks or stones of the whole magnesium silicon sweetening agent of outer lining rectangular steel tube.
Fig. 2 is that the whole magnesium silicon sweetening agent of outer lining rectangular steel tube is packed into and built the vertical view of the chamber hot metal ladle that responds by laying bricks or stones.
Fig. 3 does not build the 3rd upper cover refractory brick and the 4th upper cover refractory brick by laying bricks or stones, does not seal the first wedge shape refractory brick and the second wedge shape refractory brick at charging opening place, builds the vertical view of the hot metal ladle of the chamber that responds by laying bricks or stones.
Fig. 4 is the sectional view of building the hot metal ladle A-A direction of the chamber that responds by laying bricks or stones.
description of reference numerals: 1 is hot metal ladle, 2 is the whole magnesium silicon sweetening agent of outer lining rectangular steel tube, 3 is the first wedge shape refractory brick, 4 is the second wedge shape refractory brick, 5 is dykes and dams tops the first refractory brick, 6 is the second refractory brick, 7 for being provided with the dykes and dams lower floors refractory brick in lower reaction mouthful and middle reaction gap, 8 is the first upper cover refractory brick, 9 is the second upper cover refractory brick, 10 is dykes and dams tops the second refractory brick, 11 is dykes and dams tops the 3rd refractory brick, 12 is the first band steel, 13 is the second band steel, 14 is semicircular refractory brick, 15 is the 3rd upper cover refractory brick, 16 is the 4th upper cover refractory brick, 17 is dykes and dams lower floors the first refractory brick, 18 is dykes and dams lower floors the second refractory brick, 19 is the first iron wire, 20 is the second iron wire, 21 is middle reaction gap, 22 is lower reaction mouth.
Embodiment:
For guaranteeing to reach desirable desulfurization treatment effect, reaction mouthful under the iron plate of employings≤2mm, iron filings shutoff, middle reaction gap and upper reaction gap, realization desulphurization reaction when the molten iron degree of depth that pours 〉=2 meters begins.
For adopting the mode that to carry out again the mechanically mixing compacting after the mg-si master alloy fragmentation, adopt the pressing machine compacting of 100 tons or 360 tons after mixing.
The above-mentioned outer lining rectangular steel tube that offers regulator hole or pressure regulation seam used also can be replaced by rectangular steel pipe.
The above-mentioned outer lining rectangular steel tube that offers regulator hole or pressure regulation seam used also can select the material of cast iron to adopt the method manufacturing of casting.
Above-mentioned desulfuration processing method, the iron water amount of processing for desulfurization 〉=10 ton hours, employing is built the twice dykes and dams by laying bricks or stones in hot metal ladle bottom centre, above-mentioned sweetening agent is placed between the twice dykes and dams, fixing dykes and dams upper cover plate is built at top in twice dykes and dams reaction chamber inboard by laying bricks or stones, reserve charging opening between the twice dykes and dams, push-tight wedge shape refractory brick sealing charging opening, accompany band steel, iron wire between movable wedge shape refractory brick and fixing dykes and dams upper cover plate, be provided with the dykes and dams lower floors refractory brick in lower reaction mouthful and middle reaction gap in the downside many places of twice dykes and dams; After molten iron poured hot metal ladle, the centre along continuous straight runs of the magnesium steam of high-temperature gasification at the bottom of by the hot metal ladle ground that is evenly distributed outwards sprayed, and the gap of leaving between movable wedge shape refractory brick and dykes and dams upper cover plate also participates in reaction.
Above-mentioned desulfuration processing method, process iron water amount 〉=10 ton hours for desulfurization, also can adopt build by laying bricks or stones in hot metal ladle bottom two have lower reaction mouthful and middle reaction gap relative, all have a structure with push-tight wedge shape refractory brick and band steel closed reaction chamber charging opening, distance between the lower reaction of two reaction chambers mouthful 〉=bag end radius is provided with the dykes and dams lower floors refractory brick in lower reaction mouth and middle reaction gap in the downside many places of two reaction chambers; After molten iron poured hot metal ladle, the two ends along continuous straight runs of the magnesium steam of high-temperature gasification at the bottom of by hot metal ladle sprayed to the centre with being evenly distributed, and the gap of leaving between movable wedge shape refractory brick and dykes and dams upper cover plate also participates in reaction.
Claims (8)
1. method of processing about the outer desulfurizing iron of stove, the first part of its feature is sweetening agent: utilize rectangular steel tube to offer several pressure regulation through holes or pressure regulation seam on the middle part of its two corresponding sides, the dibasic magnesium silicon alloy liquid that is magnesium with silicon content 5～30% surpluses is poured in rectangular steel tube, solidify cooling after, just obtained the outer lining rectangular steel tube, the whole magnesium silicon sweetening agent of both ends open, the second section of its feature is the desulfurization treatment unit: be provided with the funnel-form that matches with the desulphurised hot metal pack processing in the upper end of desulfurizing iron bag and cover clad, the degree of depth of funnel-form covering clad should guarantee to be desulfurized the processing molten iron and not splash when pouring fast, the second section of its feature is that bottom in hot metal ladle (1) is by dykes and dams top the first refractory brick (5) and dykes and dams top the second refractory brick (10) and dykes and dams top the 3rd refractory brick (11), be provided with dykes and dams lower floor's refractory brick (7) in lower reaction mouthful and middle reaction gap, the dykes and dams that dykes and dams lower floor the first refractory brick (17) and dykes and dams lower floor's the second refractory brick (18) are built by laying bricks or stones, the middle part arranges the dykes and dams lower floor's refractory brick (7) educate lower reaction mouthful and middle reaction gap at the bottom of hot metal ladle, dykes and dams lower floor's the first refractory brick (17) and dykes and dams lower floor's the second refractory brick (18) that its two ends are built by laying bricks or stones are fixed, dykes and dams top the first refractory brick (5) have been built by laying bricks or stones in dykes and dams lower floor's refractory brick (7) upper end that is provided with lower reaction mouthful and middle reaction gap, its two ends are fixed by dykes and dams top the second refractory brick (10) and dykes and dams top the 3rd refractory brick (11), the step shape that protrude for its reaction chamber lower inside at the position that dykes and dams top the second refractory brick (10) contacts with neighbour the second upper cover refractory brick (9), the step shape that protrude for its reaction chamber lower inside at the position that dykes and dams top the 3rd refractory brick (11) contacts with neighbour the first upper cover refractory brick (8), the step shape that the step shape that protrude above for its end at the position that the second upper cover refractory brick (9) contacts with neighbour dykes and dams top the second refractory brick (10) and dykes and dams top the second refractory brick (10) reaction chamber lower inside are protruded matches, the second upper cover refractory brick (9) equates with the apical side height of dykes and dams top the second refractory brick (10), the step shape that the step shape that protrude above for its end at the position that the first upper cover refractory brick (8) contacts with neighbour dykes and dams top the 3rd refractory brick (11) and dykes and dams top the 3rd refractory brick (11) reaction chamber lower inside are protruded matches, and the first upper cover refractory brick (8) equates with the apical side height of dykes and dams top the 3rd refractory brick (11), the position that the first upper cover refractory brick (8) contacts with neighbour the second refractory brick (6) and the second wedge shape refractory brick (4) is its step shape that protrudes below, the position that the second refractory brick (6) contacts with neighbour the first upper cover refractory brick (8) is that the step shape that the step shape that protrudes above of the second refractory brick (6) end and the first upper cover refractory brick (8) protrude below matches, and the second refractory brick (6) equates with the apical side height of neighbour the first upper cover refractory brick (8), the position that the second upper cover refractory brick (9) contacts with neighbour the second refractory brick (6) and the second wedge shape refractory brick (4) is its step shape that protrudes below, the position that the second refractory brick (6) contacts with neighbour the second upper cover refractory brick (9) is that the step shape that the step shape that protrudes above of the second refractory brick (6) end and the second upper cover refractory brick (9) protrude below matches, and the second refractory brick (6) equates with the apical side height of neighbour the second upper cover refractory brick (9), the second band steel (13) is welded into the second iron wire (20) top that the right angle is suspended on the second refractory brick (6), with the second wedge shape refractory brick (4) large plane one end down, its faceted end up, insert between the first upper cover refractory brick (8) and the second upper cover refractory brick (9), leave the free gap between the lower end of the second wedge shape refractory brick (4) and the first upper cover refractory brick (8) and the second upper cover refractory brick (9), the large plane of the second wedge shape refractory brick (4) lower end is concordant with the bottom surface of the first upper cover refractory brick (8) and the second upper cover refractory brick (9), accompany the second band steel (13) between the second wedge shape refractory brick (4) and the second refractory brick (6), the first band steel (12) is welded into the first iron wire (19) top that the right angle is suspended on dykes and dams top the first refractory brick (5) reaction chamber inboard, with the first wedge shape refractory brick (3) facet one end down, one end on its large plane up, insert between the second wedge shape refractory brick (4) and dykes and dams top the first refractory brick (5), accompany the first band steel (12) between the first wedge shape refractory brick (3) and dykes and dams top the first refractory brick (5), all leave the upper reaction gap of up/down perforation between the first wedge shape refractory brick (3) and the first upper cover refractory brick (8) and the second upper cover refractory brick (9), be provided with semicircular refractory brick (14) in the reaction chamber of hot metal ladle (1), semicircular refractory brick (14) is built by laying bricks or stones together with dykes and dams top the second refractory brick (10) and dykes and dams top the 3rd refractory brick (11), neighbour the second upper cover refractory brick (9) of the 3rd upper cover refractory brick (15) is built by laying bricks or stones on dykes and dams top the second refractory brick (10) and semicircular refractory brick (14), neighbour the first upper cover refractory brick (8) of the 4th upper cover refractory brick (16) is built by laying bricks or stones on dykes and dams top the 3rd refractory brick (11) and semicircular refractory brick (14), the end face of semicircular refractory brick (14) is lower than the overhead height of the step shape of dykes and dams top the 3rd refractory brick (11) reaction chamber lower inside protrusion, the end face of semicircular refractory brick (14) is lower than the overhead height of the step shape of dykes and dams top the second refractory brick (10) reaction chamber lower inside protrusion, dykes and dams top the first refractory brick (5) is concordant with dykes and dams top the second refractory brick (10) and dykes and dams top the 3rd refractory brick (11) overhead height, in above-mentioned reaction chamber of building by laying bricks or stones except the first wedge shape refractory brick (3) and the second wedge shape refractory brick (4) other refractory brick be fixedly and build by laying bricks or stones, be used for wriggling processing after hot metal ladle (1) oven dry that will construct,
Its treatment step is as follows:
a, the whole mg-si master alloy sweetening agent (2) of outer lining rectangular steel tube of preparation is on request put in the reaction chamber of hot metal ladle (1), the first band steel (12) and the subassembly of the first iron wire (19) welding are suspended on the top of dykes and dams top the first refractory brick (5) reaction chamber inboard, the second band steel (13) and the subassembly of the second iron wire (20) welding are suspended on the top of the second refractory brick (6), with neighbour the second refractory brick (6) of the second wedge shape refractory brick (4), large plane one end of the second wedge shape refractory brick (4) down, its faceted end up, insert between the first upper cover refractory brick (8) and the second upper cover refractory brick (9), with the first wedge shape refractory brick (3) facet one end down, one end on its large plane up, insert push-tight between the second wedge shape refractory brick (4) and dykes and dams top the first refractory brick (5),
B, funnel-form is covered clad be placed on hot metal ladle;
C, molten iron cover clad by funnel-form and pour hot metal ladle (1) and carry out desulphurization reaction, space input protection of inert gas in the top of desulphurised hot metal bag simultaneously;
After d, desulphurization reaction finish, funnel-form is covered clad and hang away, the first wedge shape refractory brick (3) that will float and the second wedge shape refractory brick (4) take out;
E, will be desulfurized the molten iron of processing after skimming and leave the desulphurisation treater position, be transported to the subsequent processing link.
2. a kind of method of processing about the outer desulfurizing iron of stove according to claim 1 is characterized in that with pouring into silicon content 5～30% surpluses in the outer lining rectangular steel tube be that the granular powder powder mg-si master alloy that the dibasic magnesium silicon alloy of magnesium is replaced into identical component is compacted in the outer lining rectangular steel tube that offers regulator hole or pressure regulation seam with pressing machine.
3. according to claim 1,2 a kind of described methods of processing about the outer desulfurizing iron of stove, the rectangular steel tube that it is characterized in that offering the outer lining of regulator hole or pressure regulation seam is replaced by rectangular steel pipe.
4. a kind of method of processing about the outer desulfurizing iron of stove according to claim 1, it is characterized in that adopting 75 ferrosilicon to replace Pure Silicon Metals, making silicon content 5%～30% surplus is that the magnesium ferrosilicon ternary alloy of magnesium and the 75 ferrosilicon iron-holder of bringing into is above-mentioned sweetening agent used.
5. a kind of method of processing about the outer desulfurizing iron of stove according to claim 1, it is characterized in that rectangular parallelepiped metal MAG block is placed in the outer lining rectangular steel tube of both ends open, isolated by the refractory materials of consolidation between rectangular parallelepiped metal MAG block and outer lining rectangular steel tube, carrying out desulfurization in the hot metal ladle reaction chamber as sweetening agent is placed into take the rectangular parallelepiped metal MAG block of the refractory materials of outer lining rectangular steel tube and consolidation processes, adjust the size of the area of exposed metal MAG block and outer lining rectangular steel tube and increase the length of metal MAG block, the length of the refractory materials of outer lining rectangular steel tube and consolidation can extend the time of molten iron reaction effectively.
6. 5 a kind of described methods of processing about the outer desulfurizing iron of stove according to claim 1,, it is characterized in that adopting≤iron plate of 2mm, reaction mouthful under the iron filings shutoff, middle reaction gap and upper reaction gap, realize that desulphurization reaction begins when the molten iron degree of depth that pours 〉=2 meters.
7. according to claim 1, 2, 4, 5 is described a kind of about the outer desulfurizing iron treatment process of stove, it is characterized in that the iron water amount processed for desulfurization 〉=10 ton hours, employing is built the twice dykes and dams by laying bricks or stones in hot metal ladle bottom centre, the whole mg-si master alloy sweetening agent of outer lining rectangular steel tube is placed between the twice dykes and dams, fixing dykes and dams upper cover plate is built at top in twice dykes and dams reaction chamber inboard by laying bricks or stones, reserve charging opening between the twice dykes and dams, push-tight wedge shape refractory brick sealing charging opening, accompany band steel between movable wedge shape refractory brick and fixing dykes and dams upper cover plate, iron wire, be provided with the dykes and dams lower floors refractory brick in lower reaction mouthful and middle reaction gap in the downside many places of twice dykes and dams, after molten iron poured hot metal ladle, the centre along continuous straight runs of the magnesium steam of high-temperature gasification at the bottom of by the hot metal ladle ground that is evenly distributed outwards sprayed, and the gap of leaving between movable wedge shape refractory brick and dykes and dams upper cover plate also participates in reaction.
8. according to claim 1,2,4,5 is described a kind of about the outer desulfurizing iron treatment process of stove, it is characterized in that processing iron water amount 〉=10 ton hours for desulfurization, employing build by laying bricks or stones in hot metal ladle bottom two have lower reaction mouthful and middle reaction gap relative, all have a structure with push-tight wedge shape refractory brick and band steel closed reaction chamber charging opening, distance between the lower reaction of two reaction chambers mouthful 〉=bag end radius is provided with the dykes and dams lower floors refractory brick in lower reaction mouth and middle reaction gap in the downside many places of two reaction chambers; After molten iron poured hot metal ladle, the two ends along continuous straight runs of the magnesium steam of high-temperature gasification at the bottom of by hot metal ladle sprayed to the centre with being evenly distributed, and the gap of leaving between movable wedge shape refractory brick and dykes and dams upper cover plate also participates in reaction.
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| JP4126801B2 (en) * | 1999-03-11 | 2008-07-30 | トヨタ自動車株式会社 | Method for processing molten metal of spheroidal graphite cast iron |
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