CN103664212B - Castable refractory for tundish permanent layer and preparation method of permanent layer - Google Patents
Castable refractory for tundish permanent layer and preparation method of permanent layer Download PDFInfo
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- CN103664212B CN103664212B CN201310683155.5A CN201310683155A CN103664212B CN 103664212 B CN103664212 B CN 103664212B CN 201310683155 A CN201310683155 A CN 201310683155A CN 103664212 B CN103664212 B CN 103664212B
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Abstract
The invention belongs to the technical field of refractory materials, and particularly relates to a castable refractory for a tundish permanent layer and a preparation method of the tundish permanent layer. The raw materials of the castable refractory comprise the following components in percentage by weight: 75-90% of ferrovanadium slag, 2-10% of silicon dioxide, 3-20% of aluminium oxide and sodium hexametaphosphate of which the weight accounts for 0.15-0.30% of total weight of the three raw materials. The invention further provides a preparation method of the permanent layer. The preparation method comprises the following steps: uniformly mixing the four raw materials, adding water for uniform mixing, then pouring the mixed material into a die for natural drying and drying, so as to obtain the product. The castable refractory has the erosion resistance and use performance superior to a conventional castable for the tundish permanent layer and lower production cost, can effectively reduce the consumption of tundish refractory material in steelmaking, and develops a new application approach on comprehensive utilization of waste resources of ferrovanadium slag at the same time.
Description
Technical field
The invention belongs to technical field of refractory materials, be specifically related to the preparation method of a kind of tundish permanent layer refractory castable and permanent layer.
Background technology
Pan Gangfan industry company produces in the process of high vanadium ferroalloy in thermite process, in order to by the barium oxide reduction in vanadium slag, needs to add a certain amount of metallic aluminium and lime in smelting process; In order to improve the recovery rate of vanadium, smelting also needs to add a certain amount of lime in later stage refining or winding-up process and carries out slag making; What the electric furnace liner simultaneously smelting vanadium titanium adopted is that the direct ramming of magnesia forms, and unavoidably has partial oxidation magnesium to be at high temperature fused in high temperature sludge liquid during smelting.After smelting completes vanadium iron cooling, the calcium oxide of oxidized metallic aluminium, the magnesium oxide of fusing and slag making jointly cools with vanadium iron and is separated, and form the ferrovanadium slag cake of heavily about 3 tons, about 1.5 ten thousand tons every year, main component is Al
2o
3(its content is up to more than 60%), separately has a certain amount of calcium and magnesium oxides and other material.
The process application mode of this ferrovanadium slag has two kinds: one to be particle ferrovanadium slag cake being directly broken into 0 ~ 15mm at present, and for the production of the refractory materials as furnace bottom during high vanadium ferroalloy, but its consumption is little; Second method is exactly taken out by ferrovanadium slag, and extract residual vanadium wherein by buyer, the ferrovanadium slag after vanadium extraction is stacked as waste.These two kinds for the treatment of processs all basically can not solve the large problem of ferrovanadium slag amount, and due to vanadium iron price declines, adopt second method process ferrovanadium slag profitless, therefore a large amount of ferrovanadium slags is stacked in a large number as trade waste, not only need a large amount of stacking places, also pollute environment, cause the wasting of resources.Because this slag is formed through the melting of 1-2 hour under 1900 DEG C of conditions, its refractoriness is higher, develops and utilizes in high-grade refractory materials direction, walks the route of resource circulation utilization, will have good economic benefit and social benefit.
Current domestic steel-making refractory castable general requirement is: high temperature resistant, resistant to corrosion, resistance to erosion, impermeabilisation.Wherein tundish permanent layer mould material mainly high alumina castable, its main raw material is that bauxite chamotte is with addition of aluminous cement, SiO
2micro mist, Al
2o
3the composition such as micro mist and dispersion agent, wherein Al
2o
3content is left and right more than 60% usually.Owing to adopting raw ore bauxites aggregate, its price is general all higher at about 3000 yuan/ton.And ferrovanadium slag produces the by product after high vanadium ferroalloy as Pan Gangfan industry company, it is cheap, better performances, effectively can replace general bauxites aggregate and high-alumina cement etc. and carry out the high-quality raw material of resistance to material as main raw material and study.
The analysis of table 1 ferrovanadium slag
| Title | SiO 2，% | Al 2O 3，% | Fe 2O 3，% | CaO，% | MgO，% | Refractoriness, DEG C | Volume density, gcm -3 | TV，% |
| Ferrovanadium slag | ≤0.50 | 60～75 | ≤1.0 | 5～10 | 20～25 | ＞1790 | ＞3.0 | 1～2 |
As known from Table 1, ferrovanadium slag is with Al
2o
3be main component with MgO, total amount is greater than 85%, and take CaO as time composition, its content is 5.0 ~ 10.0%, and the total content of these three kinds of compositions is more than 90%, and other be impurity component, wherein to the impurity F e that refractory materials is harmful to
2o
3content, below 1.0%, should belong to lower foreign matter content, can meet the service requirements of high-quality tundish permanent layer mould material completely.
Summary of the invention
First technical problem to be solved by this invention is to provide a kind of tundish permanent layer refractory castable.This tundish permanent layer refractory castable raw material is made up of the component of following weight per-cent: ferrovanadium slag 75 ~ 90%, silicon-dioxide 2 ~ 10%, aluminum oxide 3 ~ 20%, accounts for the Sodium hexametaphosphate 99 that first three plants raw material gross weight 0.15 ~ 0.30%.
Preferably, above-mentioned tundish permanent layer refractory castable, described ferrovanadium slag is made up of 5 < granularity≤10mm, 2 < granularity≤5mm, 0.1 < granularity≤2mm and granularity≤0.045mm tetra-kinds of specifications; Mould material raw material is made up of the component of following weight per-cent: the ferrovanadium slag 15 ~ 30% of 5 < granularity≤10mm, the ferrovanadium slag 10 ~ 35% of 2 < granularity≤5mm, the ferrovanadium slag 10 ~ 35% of 0.1 < granularity≤2mm, the ferrovanadium slag 10 ~ 30% of granularity≤0.045mm, silicon-dioxide 2 ~ 10%, aluminum oxide 3 ~ 20%, accounts for the Sodium hexametaphosphate 99 that the first six plants raw material gross weight 0.15 ~ 0.30%.
Concrete, above-mentioned tundish permanent layer refractory castable, the granularity≤0.075mm of described silicon-dioxide, the granularity≤0.075mm of described aluminum oxide.
Concrete, above-mentioned tundish permanent layer refractory castable, described ferrovanadium slag main component is Al
2o
360 ~ 75%, MgO20 ~ 25%, CaO5 ~ 10%.
Concrete, above-mentioned tundish permanent layer refractory castable, Al in described aluminum oxide
2o
3> 99%.
Concrete, above-mentioned tundish permanent layer refractory castable, SiO in described silicon-dioxide
2> 90%.
Second technical problem that the present invention solves there is provided the preparation method of tundish permanent layer.The method comprises the following steps: mixed in proportion by raw material, then adds the water mixing accounting for raw material gross weight 5 ~ 8%, obtains compound; Compound is put into mould seasoning, the demoulding, then at 150 ~ 250 DEG C, be incubated 20 ~ 30h, insulation 40 ~ 50h at 750 ~ 850 DEG C, insulation 90 ~ 100h at 1100 ~ 1400 DEG C.
Adopt raw material of the present invention and the tundish permanent layer stable performance prepared by method, more than 800 heats can be reached in steel-making use procedure, improve many than existing 600 heats, the resistance to material wastage in bulk or weight in STEELMAKING PRODUCTION can be reduced simultaneously, meet demand of industrial production completely.In addition, be that main raw material can make mould material raw materials cost per ton use mould material cost to reduce about 300 yuan more at present owing to adopting cheap ferrovanadium slag, there is obvious economic benefit; Simultaneously also for the comprehensive utilization of ferrovanadium slag secondary resource opens new application approach.
Embodiment
A kind of tundish permanent layer refractory castable, raw material is made up of the component of following weight per-cent: ferrovanadium slag 75 ~ 90%, silicon-dioxide 2 ~ 10%, aluminum oxide 3 ~ 20%, accounts for the Sodium hexametaphosphate 99 that first three plants raw material gross weight 0.15 ~ 0.30%.
Preferably, in order to improve use properties, above-mentioned tundish permanent layer refractory castable, described ferrovanadium slag is made up of 5 < granularity≤10mm, 2 < granularity≤5mm, 0.1 < granularity≤2mm and granularity≤0.045mm tetra-kinds of specifications; Mould material raw material is made up of the component of following weight per-cent: the ferrovanadium slag 15 ~ 30% of 5 < granularity≤10mm, the ferrovanadium slag 10 ~ 35% of 2 < granularity≤5mm, the ferrovanadium slag 10 ~ 35% of 0.1 < granularity≤2mm, the ferrovanadium slag 10 ~ 30% of granularity≤0.045mm, silicon-dioxide 2 ~ 10%, aluminum oxide 3 ~ 20%, accounts for the Sodium hexametaphosphate 99 that the first six plants raw material gross weight 0.15 ~ 0.30%.
Concrete, above-mentioned tundish permanent layer refractory castable, described ferrovanadium slag main component is Al
2o
360 ~ 75%, MgO20 ~ 25%, CaO5 ~ 10%; Al in described aluminum oxide
2o
3> 99%, granularity≤0.075mm; SiO in described silicon-dioxide
2> 90%, granularity≤0.075mm.
The preparation method of above-mentioned tundish permanent layer, comprises the following steps: mixed in proportion by raw material, then adds the water mixing accounting for raw material gross weight 5 ~ 8%, obtains compound; Compound is put into mould seasoning, the demoulding, then at 150 ~ 250 DEG C, be incubated 20 ~ 30h, insulation 40 ~ 50h at 750 ~ 850 DEG C, insulation 90 ~ 100h at 1100 ~ 1400 DEG C.
The ferrovanadium slag that raw material of the present invention uses contains the high temperature resistant thing phase such as aluminum oxide and magnesium oxide of larger proportion, the ferrovanadium slag adding different mass scope in tundish permanent layer mould material is determined according to its chemical composition ranges, effectively can reduce the steel-making cost of resistance to material, and use properties is excellent.
The inventive method with cheap ferrovanadium slag for main raw material, due to the fluctuation of ferrovanadium slag chemical composition content, the adding proportion scope having determined its suitable grain size proportion and different material through a large amount of campaigns can reach its optimum performance requirement as tundish permanent layer mould material, also take full advantage of ferrovanadium slag secondary resource simultaneously, make it be worth and embodied.
Mould material of the present invention is prepared into 160mm × 40mm × 40mm size, performance index requirement is: 110 DEG C × 24h volume density>=2.3g/cm
3, 110 DEG C × 24h compressive strength>=20Mpa, 1500 DEG C × 3h compressive strength>=40Mpa; 110 DEG C × 24h folding strength>=4Mpa, 1500 DEG C × 3h folding strength>=8Mpa; Wherein, the detection of outward appearance adopts range estimation, Al
2o
3measuring method press GB/T6900, the measuring method of refractoriness presses GB/T7322, and the measuring method of volume density presses YB/T5200, and the measuring method of cold crushing strength presses YB/T5201.
Embodiment 1
Raw material: 90% ferrovanadium slag: mainly containing Al
2o
360%, MgO22%, CaO5%; 5 < granularity≤10mm ferrovanadium slags account for 30%, and the ferrovanadium slag of 2 < granularity≤5mm accounts for 35%, and the ferrovanadium slag of 0.1 < granularity≤2mm accounts for 15%, and granularity≤0.045mm ferrovanadium slag accounts for 10%; 2% silicon-dioxide: SiO
2> 90%, granularity≤0.075mm; 8% aluminum oxide: Al
2o
3> 99%, granularity≤0.075mm; Account for the Sodium hexametaphosphate 99 of ferrovanadium slag, silicon-dioxide and aluminum oxide gross weight 0.30%;
The preparation of permanent layer: above-mentioned various raw material is first prepared burden in described ratio, then agitating-bagging in stirrer, adding water during use stirs again; Described amount of water accounts for 5% of material gross weight; The material be uniformly mixed is poured in the mould of tundish, applies the object that vibration reaches flowing forming by vibrating head to mould material; The demoulding after air-set drying of this mould material, and through on-the-spot 250 DEG C × 30h, 750 DEG C × 40h, can come into operation after the baking of 1400 DEG C × 90h;
The mould material that each proportioning raw materials of the present embodiment becomes makes 160mm × 40mm × 40mm size as stated above, and after testing, gained physicochemical property is: 110 DEG C × 24h volume density is 2.5g/cm
3, 110 DEG C × 24h compressive strength 25.12Mpa, 1500 DEG C × 3h compressive strength 55.28Mpa; 110 DEG C × 24h folding strength 5.23Mpa, 1500 DEG C × 3h folding strength 11.20Mpa.
Embodiment 2
Raw material: 85% ferrovanadium slag: mainly containing Al
2o
365%, MgO25%, CaO8%; 5 < granularity≤10mm ferrovanadium slags account for 20%, and the ferrovanadium slag of 2 < granularity≤5mm accounts for 20%, and the ferrovanadium slag of 0.1 < granularity≤2mm accounts for 30%; Granularity≤0.045mm ferrovanadium slag accounts for 15%; 5% silicon-dioxide: SiO
2> 90%, granularity≤0.075mm; 10% aluminum oxide: Al
2o
3> 99%, granularity≤0.075mm; Account for the Sodium hexametaphosphate 99 of ferrovanadium slag, silicon-dioxide and aluminum oxide gross weight 0.20%;
The preparation of permanent layer: first prepared burden in ratio of the present invention by above-mentioned various raw material, then agitating-bagging in stirrer, adds water during use again and fully stirs; Described amount of water accounts for 7% of material gross weight; The material be uniformly mixed is poured in the mould of tundish, applies the object that vibration reaches flowing forming by vibrating head to mould material; The demoulding after air-set drying of this mould material, and through on-the-spot 200 DEG C × 24h, 800 DEG C × 48h, can come into operation after the baking of 1250 DEG C × 96h;
The mould material that each proportioning raw materials of the present embodiment becomes makes 160mm × 40mm × 40mm size as stated above, and after testing, gained physicochemical property is: 110 DEG C × 24h volume density is 2.6g/cm
3, 110 DEG C × 24h compressive strength 22.12Mpa, 1500 DEG C × 3h compressive strength 60.25Mpa; 110 DEG C × 24h folding strength 5.48Mpa, 1500 DEG C × 3h folding strength 9.86Mpa.
Embodiment 3
Raw material: 75% ferrovanadium slag: Al
2o
3content 75%, MgO20%, CaO9%; 5 < granularity≤10mm ferrovanadium slags account for 15%, and the ferrovanadium slag of 2 < granularity≤5mm accounts for 10%, and the ferrovanadium slag of 0.1 < granularity≤2mm accounts for 35%; Granularity≤0.045mm ferrovanadium slag accounts for 15%; 7% silicon-dioxide: SiO
2> 90%, granularity≤0.075mm; 18% aluminum oxide: Al
2o
3> 99%, granularity≤0.075mm; Account for the Sodium hexametaphosphate 99 of ferrovanadium slag, silicon-dioxide and aluminum oxide gross weight 0.20%;
The preparation of permanent layer: above-mentioned various raw material is first prepared burden in ratio of the present invention, then agitating-bagging in stirrer, add water during use stirring more than 5 minutes again; Described amount of water accounts for 8% of total material; ; The material be uniformly mixed is poured in the mould of tundish, applies the object that vibration reaches flowing forming by vibrating head to mould material; The demoulding after air-set drying of this mould material, and through on-the-spot 150 DEG C × 20h, 850 DEG C × 50h, can come into operation after the baking of 1100 DEG C × 100h;
The mould material that each proportioning raw materials of the present embodiment becomes makes 160mm × 40mm × 40mm size as stated above, and after testing, gained physicochemical property is: 110 DEG C × 24h volume density is 2.58g/cm
3, 110 DEG C × 24h compressive strength 28.18Mpa, 1500 DEG C × 3h compressive strength 60.23Mpa; 110 DEG C × 24h folding strength 6.28Mpa, 1500 DEG C × 3h folding strength 12.36Mpa.
Sample standard prepared by existing basket pouring material is 160mm × 40mm × 40mm, and after testing, its sample physicochemical property is detected as: 110 DEG C × 24h volume density is 2.35g/cm
3, 110 DEG C × 24h compressive strength 22.5Mpa, 1500 DEG C × 3h compressive strength 48.69Mpa; 110 DEG C × 24h folding strength 4.85Mpa, 1500 DEG C × 3h folding strength 8.42Mpa.
As can be seen from the indices of embodiment 1,2,3 and existing permanent layer, the present invention not only achieves the comprehensive utilization of waste resource ferrovanadium slag, and be there is by the permanent layer prepared after special proportioning the erosion-resisting characteristics and use properties that are better than conventional tundish permanent layer, effectively can reduce the consumption of steel-making tundish refractory materials, there is lower production cost simultaneously, achieve good technique effect.
Claims (3)
1. tundish permanent layer refractory castable, it is characterized in that: mould material raw material is made up of the component of following weight per-cent: the ferrovanadium slag 15 ~ 30% of 5 < granularity≤10mm, the ferrovanadium slag 10 ~ 35% of 2 < granularity≤5mm, the ferrovanadium slag 10 ~ 35% of 0.1 < granularity≤2mm, the ferrovanadium slag 10 ~ 30% of granularity≤0.045mm, silicon-dioxide 2 ~ 10%, aluminum oxide 3 ~ 20%, accounts for the Sodium hexametaphosphate 99 that the first six plants raw material gross weight 0.15 ~ 0.30%; Granularity≤the 0.075mm of described silicon-dioxide, the granularity≤0.075mm of described aluminum oxide.
2. tundish permanent layer refractory castable according to claim 1, is characterized in that: in described ferrovanadium slag, main component is Al
2o
360 ~ 75%, MgO 20 ~ 25%, CaO 5 ~ 10%.
3. the preparation method of tundish permanent layer, is characterized in that: mixed by each raw material of the mould material described in any one of claim 1 ~ 2, then adds the water mixing accounting for raw material gross weight 5 ~ 8%, obtains compound; Compound is put into mould seasoning, the demoulding, then at 150 ~ 250 DEG C, be incubated 20 ~ 30h, insulation 40 ~ 50h at 750 ~ 850 DEG C, insulation 90 ~ 100h at 1100 ~ 1400 DEG C.
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| CN105130480A (en) * | 2015-10-23 | 2015-12-09 | 攀枝花钢城集团有限公司 | High alumina refractory castable for rotary kiln |
| CN112979329A (en) * | 2021-03-11 | 2021-06-18 | 马鞍山钢铁股份有限公司 | Slag pot trunnion anti-sticking steel sheath formula and manufacturing method thereof |
| CN114315330A (en) * | 2022-02-17 | 2022-04-12 | 攀枝花市银江金勇工贸有限责任公司 | Novel hot-metal bottle permanent layer castable and preparation method thereof |
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| CN103145435B (en) * | 2013-04-09 | 2014-11-19 | 长兴云峰炉料有限公司 | Vanadium iron slag runner castable |
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