Liner of large blast furnace needs fireproof material to be as high as thousands of tons, include fireproof and firebrick, fireproof mud, pouring makings, etc, the choice of liner material, basically see use position. The chamber of a stove or furnace is the passageway of molten iron of slag eduction high temperature and slag, produce the effect that a variety of elements suffer in the process. Of the molten iron in thermal current and slag acuteness erode with erode; The 2nd, slag chemistry is corroded; 3. The acuteness thermal shock of intermittent taphole. According to above characteristic, fireproof material should have channel of blast furnace iron the following characteristic: Its are main the characteristic is: Fireproof material has line of 1 taphole channel very strong fight high temperature molten iron and ability of broken bits corrode; 2. Admirable high temperature resistant reach wear-resisting function; 3 it is to fight high temperature slaggy chemistry erodes ability strong; High temperature resistant shake sex is good, volume is steady, the heavy change that burn a line is little; 5 fight a variety of oxidisability strong; The structure is simple, disassemble safeguard convenient, without harmful gas, be helpful for environmental protection.
Fireproof material basically has channel of taphole of domestic and international large blast furnace: Advocate channel introduces corundum carborundum material with carbon element; Trough introduces material with carbon element of carborundum of grog of high aluminous ground; Broken bits channel uses argillaceous grog (or earthy mine grog) carborundum material with carbon element. It is commonly used that blast furnace taphole and taphole use fireproof data. Steely exit is the pharynx and larynx of blast furnace. Blast furnace is large change, aggrandizement fusion craft brings about iron to export a quantity to increase, work environment is exasperate. With the fireproof mashed vegetable or fruit that at stemming iron pipe exports, hit into iron pipe with slimy gun. Current, gun mud basically is Al2O3-SiC-C colophony or bitumen mix and become. The composition of mud of prepare Chinese medicine by roasting it in a panbig gun can be divided for fireproof aggregate and binder two much. High temperature resistant what aggregate points to is corundum, Molaishi, Jiao Baoshi and other fireproof raw material and other modified material. Adhesive is the organic material such as colophony of water or tar pitch, phenolic aldehyde, and with SiC.Si3N4. Expander and additive mix. Collect makings forms matrix by certain bead way and weight, mix the plasticity with have certain with adhesive, the gun that use sludge can jam his. It is adhesive with water, call squirt mud again, the organic material such as tar, colophony is anhydrous gun mud. Have special demand to mud of prepare Chinese medicine by roasting it in a panbig gun: 1. Good plasticity sex and agglutinate sex; 2. High temperature systole is small; 3. Stomatic moderate, facilitating catchment; 4. Agglomeration performance is good, intensity is high; 5. Iron fluid easy open. Iron raceway groove is the entrance of iron or broken bits iron. Common liner material includes dolly material. Pouring material and oscillatory material, basically be Al2O3-SiC-C material. The liner of iron should have following property: 1. Right molten iron, slaggy corrode corrode; 2. Have good thermal stability and inferior burn a volume again; Extremely strong fight oxidation ability; Without residual with harmful gas, construction is convenient.
What does chamfer of blast furnace taphole have fireproof material? Environment of work of channel of blast furnace taphole is harsh, develop sand with molten iron directly, damage is serious. Taphole channel is fireproof material has in select material and material of the requirement in using very strong high temperature resistant. Wear-resisting. High temperature resistant slaggy, heat-resisting shake sex, fight oxidation to wait. According to this one conclusion, still need to consider the following issues: The bead diameter of agglomeration or electric frit alumina is used up more than 75% , the purpose is to improve high temperature wearability, carborundum serves as filling, form makings of a kind of channel, so dimension should be less than 3.4mm, and the quantity containing carbon that particle size is less than 0.15mm should exceed 60% , the quantity that contain carbon should be more than 0.3mm, can choose natural black lead or charcoal of the form that be not brilliant. Channel of taphole of small blast furnace uses the dolly data such as coke, clay, bitumen in, service life is brief, odour is big. To grog of tall aluminous ore - carborundum - the material of black lead dolly (or mould material) should use stage by stage. High concentration of Al2O3-SiC-C small air hole is pouring makings (bulk 4063m3) is introduced from abroad, main raw material is corundum of compact report frit. Carborundum. Join a few metal silicon. Metallic aluminium powder and certain amount hurried coagulate agent. Degumming agent. Pouring to channel of blast furnace taphole makings, regard main raw material as palm corundum, with SiC. Carbolic material expects. Clay. Tall aluminous cement. Exceed small pink and additive to make iron channel pouring makings, place is palm corundum 60~80% with scale. SiC10~30% , argillaceous 1~5% , 2~5% of tall aluminous cement, exceed small pulverous 1~15% , additive 0.3~1.0% . Blast furnace discharges line of iron channel broken bits. The rate of place lining attaint such as molten iron line is rapid, especially proportion of broken bits iron is high. For this, can come through heating up gush filling method repair channel line, obtain balance damage thereby, prolong service life.
The method that holds export of the chamber of a stove or furnace (1) opens iron mouth. In producing a course, inside crucible residual with scrap from all round Xiang Tie mouth is collected, speed is corroded to accelerate around groovy wall. So, when starting a hole, exterior should largish, interior wants a few smaller, and should prevent bore and bend. Dimension opening a window is decided according to blast furnace dimension, consider to control flow, it is commonly minutely 48. Over- fast and maintain too slow to iron mouth adverse. (2) molten iron is exported must dry, cannot discharge iron with wet mud. Because enrage the wet mud on hole wall and contact of high temperature molten iron, bring about lunt to evaporate quickly, explosion splatters, cause rupture of aperture drifting iron, affect the overhaul badly. (3) is chosen fight gunpowder mud. The maintenance of slag taphole basically relies on slag to form slag bag. So, fireproof mud should have enough fireproof sex. Fight broken bits, fight corrode, heat conduction and permeability can be good, can sufficient in two taphole process dry, and have certain plasticity, form slimy bag. (When 4) blast furnace has facility of broken bits mouth, place as far as possible on broken bits, reduce iron mouth cuttings pick-up. (5) every time clears residual. Steely. The poor value that asks actual taphole measures molten iron with theoretical calculation normally must not is more than 15% , had not gotten the big mouth that blow iron, especially when tall voltage works. (6) exit horn wants reasonable. Exit horn points out the included angle of buccal iron aperture and line of export level center. Quarrel of reasonable control iron, can make appropriate incomplete iron produces inside crucible, protect hearth, make bag of iron mouth mud firm. Along with the growth of furnace life, crucible, hearth is corroded ceaselessly, expand, odd iron decreases, molten iron also falls gradually move. So, should increase iron quarrel appropriately. But fall in certain working requirement, iron quarrel should be fixedder, often cannot change. In contemporary blast furnace, after dead iron layer is deepened, iron quarrel change is very little, sometimes generation blast furnace also is same. (7) maintains mud to cover. This rifle bolt covers mud and slimy artillery piece to press a gun to device squelchs and be become by special mud. Want mud to cover only complete, can assure to be when shot-off of loss, turbid cover close together tie with mud, make fireproof material enters iron mouth smoothly, prevent to prepare Chinese medicine by roasting it in a pan mud appears from iron wall come, iron mouth cannot join mashed vegetable or fruit.
Iron of iron field broken bits is safeguarded common filling agent of half dry in season basically is with palm corundum is given priority to, add a few corundum again. Char silicon fine powder, still make collect material with tailor-made bauxite. Main binder has ester of aggregate phosphoric acid. Silicate. Some abroad company uses aluminous acerbity calcic cement to make adhesive, carbolic content can amount to 3%-6% . Their gush drenchs replenishers is united in wedlock with matrix commonly good, in the 1450 agglomeration when spending compact. Carry out a proof, they have better performance characteristics. Gush drenchs replenishers can be maintained commonly 20, 000-30, 000 tons iron discharge. To lengthening it is channel age, important to reduced cost to rise action. The dolly structure that divides a tradition and pouring outside the structure, use prefabricated component structure morely in last few years. This kind of structure goes to the lavatory already maintenance, can improve construction efficiency again, reduce maintenance time, can realize a factory to turn production, improve the roast quality of prefabricated component, improve the service life that leaves with material thereby. Because rise. The overhaul time of the chamber of a stove or furnace is arranged commonly in blast furnace cease during wind. To improve the maintenance environment all round blast furnace, inside the chamber of a stove or furnace gas often use litre fall law. Rose to be able to bear or endure safeguard a gender. Gas cannot be passed when whereabouts. So, be in cease when wind is balanced, need is special point out: Should repair rise. Whereabouts conduit should stem conduit of blast furnace roof. From inside whereabouts canal the platoon vents his anger, should according to actual cop structure, in the place that needs maintenance two end set steam vent, set compulsive exhaust canister.
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