Channel of blast furnace taphole uses the function of fireproof material and construction demand:
Taphole advocate because channel wants to endure periodic slaggy chemistry is eroded, fireproof material must satisfy line of the channel before furnace as follows performance demand:
1, have admirable high temperature wearability, be able to bear or endure molten iron and erode slaggily capability is strong;
2, be able to bear or endure slaggy chemical aggressivity and osmotic good, fight oxidation ability strong;
3, have good heatproof shake sex, it is good that antiknock cracks a gender;
4, burn volume again change is little, have compact and even structure.
Mix according to the construction before blast furnace furnace use requirement, fireproof material must satisfy taphole channel the following condition:
1, good construction performance, can undertake fast construction;
2, can fast and roast and not scamper is cracked;
3, mix in construction harmful gas does not produce in using, do not pollute an environment;
4, do not stick broken bits iron, facilitating disintegrate and repair.
The choice of mud of taphole artillery piece:
1, mud of prepare Chinese medicine by roasting it in a panbig gun is to use the fireproof data that seals a taphole, use Al2O3 more at present - SiC - C simple stuff, can divide to have water mud of prepare Chinese medicine by roasting it in a panbig gun and anhydrous prepare Chinese medicine by roasting it in a pan mud two kinds big. Among them water prepares Chinese medicine by roasting it in a pan mud is used at the top to approach level of smelt of inferior, aggrandizement commonly not tall medium or small blast furnace;
2, to extend taphole time, investigator joins SiC, Si3N4 and the alumina that contain special carbon in mud of prepare Chinese medicine by roasting it in a panbig gun qualitative raw material of alumina of frit of qualitative, report, make prepare Chinese medicine by roasting it in a pan slimy function had huge to rise, taphole condition is stable, taphole not enlarge diameter, molten iron and broken bits stability are poured out of, but because intensity is high, need special drill talent to open iron hole.
Molten iron is carried reach pretreatment device to use fireproof data
Molten iron pretreatment is right steel-making undertakes with molten iron silicon, dephosphorization and to decoke are handled, basically mix iron in torpedo type car, ladle and undertake in the furnace that mix iron.
1, taking off silicon to basically use Tie Lin and lime is inorganic agent;
2, dephosphorization basically uses lime department and barilla is inorganic agent;
3, desulphurization basically uses lime to fasten inorganic agent.
Be in 3 in taking off processing process, as a result of slag alkalinity heighten, molten iron erodes, intermittent exercise causes temperature wave motion to wait, aggravate the corrode caustic of fireproof material, because this asks,fireproof material should be had be able to bear or endure erode, be able to bear or endure erode, heatproof shake and fight the function such as oxidation.
Torpedo type mixes iron car to have carry molten iron and undertake molten iron pretreatment two kinds of utility.
Inchoate torpedo type mixes iron car place to be compact clay brick, tall aluminous brick, Mo Laishi brick, corundum brick, dolomite brick, andalusite brick, tall aluminous carborundum with fireproof material brick and magnesian carbon brick.
After entering 80 age, convert ASC does not bake bricks, subsequently Japan joins glass of the metallic pink such as ZrO2, Al, boracic silicate, β in ASC brick on this foundation - Si3N4, β - stone of line of Al2O3, AlON, silicon a group of things with common features mineral wait with pyrophyllite, raised ASC brick further be able to bear or endure the function such as corrode sex.
Ladle uses fireproof data
Mix iron car at torpedo type relatively and character, ladle is one kind agrees with the plant of molten iron pretreatment that close quarters carries.
Most factory, ladle uses fireproof data basically is Al2O3 content in 60 ～ the tall aluminous brick between 70 ％ . The Al2O3-SiC of newest development is pouring expect service life gets rising. Because use this to plant pouring makings, surface of its job line is flowing do not hang broken bits, heat-resisting shake performance is good, and bag line arises scarcely in use process flake.
The furnace that mix iron uses fireproof data
1, the furnace that mix iron is molten iron of steelworks keep in storage, maintain and the hot project facilities of temperature of leveling molten iron and its composition, also use at taking off to remove the foreign matter part in molten iron sometimes. The furnace that mix iron is used commonly gas make fuel, operation temperature is 1500 ～ 1550 ℃ . This furnace is horizontal cylinder form normally () seeing a picture, two end wall submit spherical form.
2, the spherical end wall of the furnace that mix iron is stationary commonly, form a complete body of heater with cylinder form noumenon. End wall also but make it disassembles the structure of type is overhauled with facilitating. Install gas burner in the upper part of the upside of end wall and taphole commonly, burner brick is to use tall aluminium to pledge material is made. Because the layer of job of furnace lid liner that holds molten iron mouth drops a brick to need to often be maintained, build with argillaceous brick build by laying bricks or stones commonly. Convert fireproof and pouring expect or fireproof but the integral job layer of plastic make it, life rises significantly. When molten iron of dump of the short cylinder furnace that mix iron, to avoid to be poured out of slaggily, in taphole water mouth place setting blocks broken bits board, build with brick of half black lead or build by laying bricks or stones of black lead brick commonly, usable also contain carbon to pledge fireproof and pouring makings whole irrigates and become.
3, the entrance of molten iron outfit of the long cylinder furnace that mix iron and discharge exit are not on same vertical plane, because this also needs,build the wall that block broken bits with build by laying bricks or stones of tall aluminous brick. This wall should left and right sides of 200mm of face of tower above broken bits, its bottom sets molten iron channel, slaggy be blocked to be inside the chamber of a stove or furnace that installs molten iron a side. Should use contain carbon to exceed low cement fireproof and pouring makings when making the wall that block broken bits, service life compares bricky build by laying bricks or stones can rise 1 times the left and right sides. mixes iron furnace liner to often bear molten iron erodes, slaggy erode, the action such as temperature change and dynamic load vibration, mar more easily. Especially the place such as mouth of molten iron of push without using one's hands of mouth of water of division of broken bits line, taphole, outfit and joint of cylinder form noumenon is weak point more, in battle of a furnace, the place liner needs to often be maintained. If the impurity in dividing molten iron is taken off inside the furnace that mix iron, the life that affects liner of body of heater badly. Steelworks of large oxygen converter carries molten iron with canister of torpedo type molten iron commonly, hold the effect that has the stove that mix iron concurrently.
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