Mine hot stove is the main facility of ferroalloy smelt, the flying development as industry of our country ferroalloy and suffer a country to be opposite high cost can the macroscopical adjusting control of the enterprise, and size of mine hot stove is large in recent years the development that change, lining serves as the substantial of body of heater, erode in the machinery that high temperature high fever and charging, slag bears in smelt process and erode physico-chemically. Accordingly, reasonable design, good select material, elaborate build by laying bricks or stones is built is the key that lengthens mine to heat up furnace life.
1, the choice of the working environment of lining and material of furnace of build by laying bricks or stones
The quality of lining affects the accident of furnace life directly, lining should have particular strength and good adiabatic performance, should bear not only the machinery of molten iron of vital energy of heat of charging, high temperature, melt erodes and the content of slag is changed erode, assure to have good thermal shock stability even, if select material is undeserved or build by laying bricks or stones builds quality not to amount to mark, lining can be accelerated fused, erode burst apart even, bring about furnace of the leakage that wear iron thereby, affect smelt process on the rails directly.
So, the build by laying bricks or stones of lining is built those who need to have fireproof stuff according to the temperature difference of each place and undesirable element is reasonable the end that chooses the integral performance that improves lining with achieving and service life, this is the basic principle that lining build by laying bricks or stones builds. The material that basically chooses has: Paste of asbestine board, tall aluminous aggregate, tall aluminous fine pink, tall aluminous brick, charcoal brick, clay brick, tack, fireproof mud, pouring puddle of element of makings, carbon. Build by laying bricks or stones builds data standard: Have taller fireproof degree, particular strength (especially high temperature intensity) , bulk coefficient of expansion is small, have very tall heatproof shake sex; It is good to be able to bear or endure to erode performance physico-chemically; Performance of heat preservation accumulation of heat is good wait; Treatment precision is tall, the appearance accords with national level; Each material keeps clean, must not mix clay, dirt waits sundry, prevent be affected with damp be affected with damp, damage.
2, build by laying bricks or stones of mine hot stove builds administrative levels and select material
Before build by laying bricks or stones is built reasonable design blueprint, if plan institute is shown. Organize team of furnace of professional build by laying bricks or stones and tool, press requirement choose and buy all sorts of material. Current, the build by laying bricks or stones of lining of hot stove of large ore deposit builds a method to use water-cooling furnace wall and heat preservation lining normally two kinds,
Caption: Mine heats up design of the blueprint before furnace build by laying bricks or stones is built
1) insulation layer. The asbestine with use insulation effect better board, ply 10mm, in all two. Boiler setting is same also.
2) stretch layer. In insulation the tall aluminium aggregate with 60 ～ thick 80mm is spread above the layer, wide gap of layer of boiler setting insulation and 100mm of firebrick layer obligate, aggregate of fill tall aluminium, size range of tall aluminous aggregate 3 ～ 12mm.
3) hearth and firebrick of charcoal of boiler setting annulus layer. Large ore deposit heats up furnace to use 10 not less than hearth, this electric stove uses 12 hearth, by 3 kinds the build by laying bricks or stones of tall aluminous brick of different name is built, layer ply makes an appointment with hearth firebrick 900mm. Firebrick of charcoal of boiler setting annulus uses double-loop build by laying bricks or stones to build, 230mm of every annulus ply, total ply is 460mm.
4) job layer - charcoal brick layer. Hearth charcoal brick in all three-layer, from bottom to top, each ordinal to bake beforehand charcoal brick, brick of charcoal of two half black lead, total ply makes an appointment with L 200mm, brick of charcoal of build by laying bricks or stones of boiler setting annulus is brick of charcoal of half black lead, ply is 400mm. Charcoal brick makes good antirust step. Mine heats up 30mm of ply of furnace furnace casing, internal diameter 12200mm, lining build by laying bricks or stones is built finishing hind 3685mm of deepness of the chamber of a stove or furnace, 10200mm of diameter of the chamber of a stove or furnace. Taphole furnace at present leaves 200mm of iron layer ply, electric stove sets 2 taphole in all, l000mm of length of taphole short chute, taphole included angle 150 ° . Hearth firebrick buries 4 the 7th layer to measure tepid couple beforehand (hearth center 1, heart of 3 electrode pole lower part each 1) , boiler setting all around bury 6 to measure tepid couple beforehand (firebrick of annulus build by laying bricks or stones the 16th level distributings 3, be opposite respectively 3 electrode, the 23rd level distributings 3, with 2m of the 16th 3 perpendicular amlposition the left and right sides distributings) .
The build by laying bricks or stones of whole electric stove builds the close together sex that should assure fireproof material and lining whole sex, enough stretch layer can ensure the heat of lining bilges cold shrink quality. The ply of hearth and boiler setting and the measure tepid couple to be able to reduce furnace of the leakage that wear iron odds that distributing equably, increase capacity of accumulation of heat of lining heat preservation, in the thermal stability that heat stops furnace or lining assures when negative charge is bigger, ensure normal smelt.
3, lining build by laying bricks or stones is built
Before build by laying bricks or stones is built, undertake be sweepinged thoroughly to hearth above all, dehumidify, hearth opens 6 small steam vent, the position is calculated and each are tagged in furnace casing correspondence according to blueprint, especially mouth position.
Build by laying bricks or stones builds 1) hearth firebrick
From bottom to top is ordinal the insulation layer that is two asbestine board, adiabatic action is isolated from since, stretch layer serves as in the tall aluminous aggregate that 80mm ply spreads above insulation layer, brick of line of center of body of heater, foul line, cent decides after make level of tamp of hearth flexibility layer, hot stove of mine of alloy of silicon of this 31.5MVA manganese uses 12 hearth firebrick layer, build by laying bricks or stones builds ordinal from bottom to top to be respectively: Brick of LZ-55 tall aluminium brick of tall aluminium of 7 layer, LZ-65 brick of tall aluminium of 2 layer, LZ-75 3. Brick use G-2 model (dimension is: 75mm of × of 345mm × 150mm) , build by laying bricks or stones builds a method to be law of dry build by laying bricks or stones, bricky layer shows crisscross crisscross, every crisscross 300~45. Pin a brick to seam. The brick seams ≤ 2mm, every brick is seamed by fill of tall aluminous fine pink. Wide gap of layer and 100mm of obligate of layer of boiler setting insulation regards hearth firebrick as stretch layer and aggregate of fill tall aluminium. Moisture of law of lining dry build by laying bricks or stones is little, benefit at drying-out, but inserts porosity is big, lining is inattentive, go against assure lining whole sex. Compare, law of wet build by laying bricks or stones builds a brick to seam with fireproof slop build by laying bricks or stones, benefit at raising lining whole sex, but because moisture is overmuch, hectic capacity is more during drying-out, go against the stability of temperature.
Firebrick of 2) boiler setting annulus build by laying bricks or stones
Boiler setting firebrick uses build by laying bricks or stones of heat preservation law to build, furnace casing wall spreads two asbestine board, use tall aluminous phosphate fireproof slop is stickup. Layer of flexibility of aperture of obligate 80mm left and right sides with fill of tall aluminous aggregate, annulus bricklaying uses wet step of oar of fireclay of tall aluminous phosphate, inside and outside two annulus, choose brick of LZ-65 tall aluminium, by G-1 and G-3 brick model with 2: The scale of 1 builds for fundamental build by laying bricks or stones cooperate radian (G-1 brick dimension: 75mm of × of 230mm × 150mm; G-3 brick dimension: 75mm of × of 230mm × 150mm/135mm) ) . Annulus bricklaying layer in all 33, when annulus bricklaying firebrick the layer achieves brick of charcoal of hearth of build by laying bricks or stones of the preparation when certain height.
Build by laying bricks or stones of brick of 3) hearth charcoal is built
Charcoal brickyard home designs the treatment that make according to blueprint, spell outfit hind to make good number beforehand, the spot is built by number build by laying bricks or stones. Hearth charcoal brick in all three-layer, from bottom to top, make the same score build by laying bricks or stones first two, after waiting for brick of charcoal of build by laying bricks or stones of boiler setting annulus to finish next again build by laying bricks or stones brick of three-layer charcoal. Build by laying bricks or stones of every charcoal brick builds Qian Xianqing to manage clean, next puddle of element of the carbon on even besmear, number of the brick that press charcoal first beforehand build by laying bricks or stones, use wide seam (50mm) build by laying bricks or stones builds kind, the fault is seamed between brick of photograph adjacent charcoal, code of ° of 30 ° ~45 puts fault of each charcoal brick, aperture withstands with chock first, after entire yard puts the brick that wait for charcoal again fine tuning brick is seamed, paper fill with tack finally and pound solid smooth, sectional dimension is charcoal brick 410mm × 400mm, two side machine the groove of two wide 60mm, deep 30mm each, position of each chamfer discretion is consistent, so that knot tack paste reachs seam of the brick after hearth agglomeration,touch more firm.
Brick of 4) taphole charcoal reachs build by laying bricks or stones of annulus of brick of boiler setting charcoal
Taphole charcoal brick is used the brick mixes carborundum of half black lead to bake charcoal piece combines a brick beforehand, combine a brick in all 4, each between clear clean and puddle of element of even daub carbon, by number the code puts build by laying bricks or stones to build, build by laying bricks or stones of taphole charcoal brick builds the build by laying bricks or stones after ending to build short chute of the taphole outside boiler setting, use method of wet build by laying bricks or stones of brick of LZ-65 tall aluminium. When build by laying bricks or stones of furnace eye brick is built, need and open stencil clogging machine to debug a butt joint good. Two side make an appointment with taphole charcoal brick 750mm width firebrick uses only link build by laying bricks or stones to build, make an appointment with aperture of 1800mm of × of 750mm × 350mm not to save stretch layer,
Build by laying bricks or stones of two charcoal brick builds hearth the annulus step that brick of boiler setting charcoal should have after ending, brick of boiler setting charcoal is enchased at hearth upper part of brick of the 2nd charcoal. Build by laying bricks or stones builds means to use without seam build by laying bricks or stones to build, before build by laying bricks or stones is built, clear bottom of clean charcoal brick is even puddle of daub carbon element, press number code to put next. Stay between brick of charcoal of build by laying bricks or stones of boiler setting annulus and firebrick have 50mm crack, brick of charcoal of annulus build by laying bricks or stones is laid in inside, aperture withstands with chock first, fill is papered with tack after entire yard puts brick of charcoal of the build by laying bricks or stones that need link and pound solid, dimension of brick of charcoal of annulus build by laying bricks or stones: 400mm of × of L800mm × 400mm/370mm, echelon is sectional the radian that assures annulus build by laying bricks or stones, two taphole divide whole annulus build by laying bricks or stones two paragraphs, shi Yingxian of annulus build by laying bricks or stones in taphole charcoal brick two side put two charcoal brick according to number code, every Duan Jun by taphole charcoal brick build by laying bricks or stones is built among two side direction, till finally intermediate conference appears to be in not the mouth of norms dimension - close the door,
Build by laying bricks or stones of brick of three-layer charcoal builds 5) hearth
Hearth of the build by laying bricks or stones after brick of charcoal of build by laying bricks or stones of boiler setting annulus ends brick of three-layer charcoal, build by laying bricks or stones is built method and before two same. This charcoal brick presses taphole center line build by laying bricks or stones of two side semmetry is built. Surface of brick of three-layer charcoal spreads 100mm ply with tack paste and make level. This tack burnt action is protection charcoal brick is not oxidized during drying-out.
Layer build by laying bricks or stones builds firebrick of upside of 6) boiler setting
Firebrick of annulus build by laying bricks or stones tile tall aluminium is pouring above the layer firebrick of upside of boiler setting of build by laying bricks or stones begins after makings and make level of brick of charcoal of annulus build by laying bricks or stones, use brick of LZ-55 tall aluminium, place of 1000mm of mouth flange bottom uses PN40 clay brick, aggregate of tall aluminium of furnace casing and layer of flexibility of fill of clearance of body of build by laying bricks or stones, mouth flange bottom makes an appointment with 600mm place to begin binding off. Tall aluminous brick and clay brick brick use collocation of G-1, G-2, G-3, G-4 to make the same score build by laying bricks or stones (G-1 brick dimension: 75mm of × of 230mm × 150mm; G-2 brick dimension: 75mm of × of 345mm × 150mm; G-3 brick dimension: 75mm of × of 230mm × 150mm/135mm; G-4 brick dimension: 75mm) of × of 345mm × 150mm/130mm, law of build by laying bricks or stones is law of wet build by laying bricks or stones, with fireclay of tall aluminous phosphate oar pressing seams build by laying bricks or stones to build.
Build by laying bricks or stones builds covering layer of 7) hearth, boiler setting
Build by laying bricks or stones builds firebrick of boiler setting upside after finishing, build by laying bricks or stones builds hearth and boiler setting covering layer, hearth covering layer makes the same score build by laying bricks or stones to be above the tack paste with thick 100mm brick of clay of a PN-40, boiler setting covering layer is brick of clay of a PN-40, use establish build by laying bricks or stones + side build by laying bricks or stones, law of wet build by laying bricks or stones, brick for T-3 model (65mm of × of 230mm × 114mm) .
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