CN1785908A - Refractory pouring material used for melten iron desulfur agitator - Google Patents
Refractory pouring material used for melten iron desulfur agitator Download PDFInfo
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Abstract
The present invention discloses a refractory pouring material for molten iron desulfurization stirrer. It is formed from pouring material base material and proper quantity of additive. The composition of the base material of pouring material includes (by wt%) 55-65% of general electrofused mullite 3-10% of jiaobaoshi, 3-7% of silicon micropowder, 5-10% of alpha-Al2O3 micropowder, 3-10% of pure calcium aluminate cement and 1.5-2.5% of compact corundum fine powder, and the described additive is formed from heat-resistant steel fibre, aluminium lactate and/or metal aluminium powder and sodium triphosphate and/or trimeric cyanamide.
Description
Technical field
The invention belongs to the preceding desulfurizing iron pre-treatment fire resisting material field of converter steelmaking, relate in particular to a kind of refractory pouring material used for melten iron desulfur agitator.
Background technology
At present, when both at home and abroad smelter carries out outside the molten iron stove stirring desulphurization before converter steelmaking, employed desulfur agitator mainly is made of interior metal core bar and refractory material outside lining body, and wherein the used refractory materials of agitator lining body is the high-purity mullite refractory casting material mostly.
With the employed KR melten iron desulfur agitator of Wuhan Iron ﹠ Steel's second steelworks is example, from the producton order of this agitator as can be known the main raw material of its selected refractory castable be high-purity electrofused mullite, its major ingredient is Al by weight percentage
2O
3〉=60%, SiO
2Be about 30～35%.Its physicochemical property: ultimate compression strength (110 ℃ * 24h) 〉=24Mpa, ultimate compression strength (1500 ℃ * 3h) 〉=60Mpa; Volume density (110 ℃ * 24h) 〉=2.6g/cm
3, volume density (1500 ℃ * 3h) 〉=2.5g/cm
3Burn the back line change (1500 ℃ * 3h) be ± 0.5%.
By investigation to the Field Research of above-mentioned KR molten iron stirring desulphurization process and the damaged situation of this agitator refractory materials lining body, the principal mode of finding this agitator breakage is erosion, cracking, thermal shock crackle and thermal spalling etc., on the one hand the existing high-purity electrofused mullite refractory castable of explanation can not carry out good sintering under the actual use temperature condition of agitator, causes that lining body tissue loosens, bonding strength is on the low side, slag penetration causes structure spalling.The thermal shock resistance of high-purity on the other hand electrofused mullite mould material is relatively poor, it is unreasonable to burn back line variation performance, also can cause the refractory materials lining body heat of agitator peel off and serve as a contrast body and agitator metal-cored between in conjunction with damage phenomenon such as not tight, thereby significantly shortened work-ing life of melten iron desulfur agitator.Statistic data shows: Wuhan Iron ﹠ Steel's second steelworks KR desulfur agitator present mean life only is 350～450 times, and be 505 work-ing life the highest; The mean life of Shanghai iron and steel three KR of factory desulfur agitators is less than 200 times; Only be about 350 times the mean life of the river KR of prestige Steel Plant desulfur agitator.
Simultaneously, the raw-material employing of high-purity electrofused mullite has also increased the cost of manufacture of refractory pouring material used for melten iron desulfur agitator greatly.Compare with the molten iron spraying desulfurization spraying rifle, the work-ing life of melten iron desulfur agitator is far above the work-ing life of molten iron spraying desulfurization spraying rifle, but the stirring desulphurization degree of applying at home is far away from blowing desulfurization, and its cost of manufacture and use cost are too high also to be an important reasons.These unfavorable factors cause the research work of domestic refractory pouring material used for melten iron desulfur agitator not obtain due attention, thereby have limited the further raising in its work-ing life.
Summary of the invention
The objective of the invention is to improve deficiency of the prior art, the refractory pouring material used for melten iron desulfur agitator of a kind of starting material wide material sources, with low cost, excellent property is provided, this refractory castable can make improve more than 100 times the mean life of KR desulfur agitator under the condition that does not change agitator structure and behaviour in service.
For achieving the above object, the present invention has designed a kind of refractory pouring material used for melten iron desulfur agitator according to the constructional feature of pretreated technological process of molten iron KR stirring desulphurization and agitator, and it is mixed by mould material base-material and an amount of additive.Described mould material base-material is by weight ratio by 55～65% common electrofused mullite, 3～10% flint clay, 3～7% kyanite, 7～15% superfine high alumina, 3～6% silicon powder, α-Al of 5～10%
2O
3Micro mist, 3～10% pure calcium aluminate cement, 1.5～2.5% compact alumina fine powder constitute.Described additive is a mete-wand with the gross weight of described mould material base-material, the heat-resistant steel fiber by 1.5～2.5% ,≤0.5% Aluctyl and/or≤0.5% metallic aluminium powder ,≤0.3% tripoly phosphate sodium STPP and/or≤0.5% trimeric cyanamide constitutes.Above-mentioned all components are the starting material that can buy acquisition on the market.
The preferable weight proportion of above-mentioned mould material base-material is: 56～60% common electrofused mullite, 5～8% flint clay, 4～6% kyanite, 9～13% superfine high alumina, 4～5% silicon powder, α-Al of 6～8%
2O
3Micro mist, 5～8% pure calcium aluminate cement, 2～2.5% compact alumina fine powder.Above-mentioned additive is a mete-wand with the gross weight of above-mentioned mould material base-material, and its preferable weight proportion is: 2～2.5% heat-resistant steel fiber ,≤0.5% Aluctyl and/or≤0.5% metallic aluminium powder ,≤0.15% tripoly phosphate sodium STPP and/or≤0.5% trimeric cyanamide.
Further, the preferred grain size distribution of above-mentioned mould material base-material is: the granularity of common electrofused mullite is 0.1～8 millimeter, the granularity of flint clay is 0.1～1 millimeter, the granularity of kyanite is 150 orders, superfine high alumina is that granularity is 180 orders and two kinds of particulate mixtures of 325 purposes, and the granularity of compact alumina fine powder is 325 orders.
Further, above-mentioned granularity is in 0.1～8 millimeter the common electrofused mullite, granularity in 8～5 millimeters scopes account for 38～42%, granularity in 5～3 millimeters scopes account for 36～40%, granularity in 3～1 millimeters scopes account for 5～8%, granularity accounts for 12～17% in 1～0.1 millimeter scope.In the above-mentioned superfine high alumina, granularity is that 180 purpose particles account for 40～60%, and granularity is that 325 purpose particles account for 60～40%.
The present invention is from improving the sintering situation of refractory castable under the melten iron desulfur agitator use temperature condition, thermal shock resistance, workability, use properties, and adjust refractory castable burning back line velocity of variation equal angles and set out, and take into full account the source and the cost performance of raw material, select common electrofused mullite, flint clay is the aggregate raw material of refractory castable, not only improved the sintering situation of desulfur agitator mould material, and can be with it as the desulphurization spray gun mould material, improve its sintering situation under the blowing desulfurization condition, effectively reduce the cost of manufacture of refractory castable simultaneously.For workability and the use properties of further improving refractory castable, in the mould material base-material, increase an amount of additive in addition, include toughener, swelling agent, water reducer and detonation suppressor, design the toughener that heat-resistant steel fiber is the mould material base-material particularly, kyanite is a swelling agent, tripoly phosphate sodium STPP and/or trimeric cyanamide are water reducer, and metallic aluminium powder and/or Aluctyl are detonation suppressor.According to the principle of refractory castable raw material dense packing,, explored the best particles of aggregates grating and the powder grating of refractory castable in conjunction with specifically experiment.
Conclusion is got up, and refractory pouring material used for melten iron desulfur agitator of the present invention has following advantage:
One, refractory castable of the present invention is according to the technological process of molten iron stirring desulphurization and the constructional feature of agitator itself, selecting common electrofused mullite and flint clay cheap, wide material sources is main raw material, and the used starting material of the present invention are the commercial goods, have reduced the production cost of refractory castable significantly.
Its two, refractory castable of the present invention sintering situation under the working conditions of molten iron stirring desulphurization is good, the bonding strength height.The present invention is an aggregate by selecting lower common electrofused mullite and the flint clay of sintering temperature, has effectively improved the sintering situation between aggregate and the powder, has improved the degree of compactness and the anti-slag penetration ability of agitator refractory materials lining body under the working conditions.
Its three, refractory castable of the present invention by the mould material base-material choose reasonable and additive in the reasonable assembly of toughener, water reducer, detonation suppressor etc., make refractory castable have good construction performance and good use properties.
They are four years old, adopt KR desulfur agitator excellent property that refractory castable of the present invention produces, with low cost, evidence is under the situation of not adjusting agitator structure and other production and application conditions, and can improve more than 100 times on the former basis its mean life.
Embodiment
Below in conjunction with specific embodiment refractory pouring material used for melten iron desulfur agitator of the present invention is described in further detail:
Embodiment 1:
Prepare 103.15 kilograms of refractory pouring material used for melten iron desulfur agitator of the present invention, wherein: mould material base-material gross weight is 100 kilograms, and the additive gross weight is 3.15 kilograms.Above-mentioned mould material base-material is by weight ratio by 56 kilograms of common electrofused mullites, 8.5 kilograms of flint claies, 5 kilograms of kyanites, 10 kilograms of superfine high aluminas, 4 kilograms of silicon powders, 8 kilograms of α-Al
2O
3Micro mist, 6 kilograms of pure calcium aluminate cements, 2.5 kilograms of compact alumina fine powders constitute.Above-mentioned additive is a mete-wand with 100 kilograms of mould material base-materials, is made of 2 kilograms of heat-resistant steel fibers, 0.5 kilogram of Aluctyl, 0.15 kilogram of tripoly phosphate sodium STPP, 0.5 kilogram of trimeric cyanamide.The grain size distribution of above-mentioned 56 kilograms of common electrofused mullites is 0.1～8 millimeter, and wherein have 22 kilogram, granularity have 22 kilogram, granularity have 4 kilogram, granularity 3～1 millimeter scopes in 5～3 millimeter scopes in of granularity in 8～5 millimeters scopes have 8 kilograms in 1～0.1 millimeter scope.The granularity of above-mentioned flint clay is 0.1～1 millimeter.The granularity of above-mentioned kyanite is 150 orders.In above-mentioned 10 kilograms of superfine high aluminas, granularity is that 180 purpose particles have 5 kilograms, and 325 purpose particles have 5 kilograms.The granularity of above-mentioned compact alumina fine powder is 325 orders.The above-mentioned refractory castable for preparing is poured into according to a conventional method the test block of 40mm * 40mm * 160mm, and use mould material always with desulfur agitator and carry out the thermal shock resistance contrast experiment, be specially 1200 ℃ of water-cooled experiments, the result shows, the water-cooled number of times of refractory castable of the present invention is higher 0.7～1 times than desulfur agitator mould material commonly used, and refractory castable cost of the present invention descends about about 15%.
Embodiment 2:
Prepare 103.70 kilograms of refractory pouring material used for melten iron desulfur agitator of the present invention, wherein: mould material base-material gross weight is 100 kilograms, and the additive gross weight is 3.70 kilograms.Above-mentioned mould material base-material is by weight ratio by 65 kilograms of common electrofused mullites, 3 kilograms of flint claies, 6 kilograms of kyanites, 12 kilograms of superfine high aluminas, 3.5 kilograms of silicon powders, 5 kilograms of α-Al
2O
3Micro mist, 4 kilograms of pure calcium aluminate cements, 1.5 kilograms of compact alumina fine powders constitute.Above-mentioned additive is a mete-wand with 100 kilograms of mould material base-materials, is made of 2.5 kilograms of heat-resistant steel fibers, 0.3 kilogram of Aluctyl, 0.3 kilogram of metallic aluminium powder, 0.2 kilogram of tripoly phosphate sodium STPP, 0.4 kilogram of trimeric cyanamide.The grain size distribution of above-mentioned 65 kilograms of common electrofused mullites is 0.1～8 millimeter, and wherein have 27 kilogram, granularity have 24 kilogram, granularity have 5 kilogram, granularity 3～1 millimeter scopes in 5～3 millimeter scopes in of granularity in 8～5 millimeters scopes have 9 kilograms in 1～0.1 millimeter scope.The granularity of above-mentioned flint clay is 0.1～1 millimeter.The granularity of above-mentioned kyanite is 150 orders.In above-mentioned 12 kilograms of superfine high aluminas, granularity is that 180 purpose particles have 7.2 kilograms, and 325 purpose particles have 4.8 kilograms.The granularity of above-mentioned compact alumina fine powder is 325 orders.The above-mentioned refractory castable for preparing is poured into the test block of 40mm * 40mm * 160mm according to a conventional method, and use mould material always with desulfur agitator and carry out the thermal shock resistance contrast experiment, be specially 1200 ℃ of water-cooleds experiments, the result is substantially the same manner as Example 1.
Embodiment 3:
Prepare 102.60 kilograms of refractory pouring material used for melten iron desulfur agitator of the present invention, wherein: mould material base-material gross weight is 100 kilograms, and the additive gross weight is 2.60 kilograms.Above-mentioned mould material base-material is by weight ratio by 55 kilograms of common electrofused mullites, 10 kilograms of flint claies, 4 kilograms of kyanites, 8 kilograms of superfine high aluminas, 6 kilograms of silicon powders, 7 kilograms of α-Al
2O
3Micro mist, 8 kilograms of pure calcium aluminate cements, 2 kilograms of compact alumina fine powders constitute.Above-mentioned additive is a mete-wand with 100 kilograms of mould material base-materials, is made of 1.5 kilograms of heat-resistant steel fibers, 0.4 kilogram of Aluctyl, 0.2 kilogram of metallic aluminium powder, 0.5 kilogram of trimeric cyanamide.The grain size distribution of above-mentioned 55 kilograms of common electrofused mullites is 0.1～8 millimeter, and wherein have 21 kilogram, granularity have 21 kilogram, granularity have 4 kilogram, granularity 3～1 millimeter scopes in 5～3 millimeter scopes in of granularity in 8～5 millimeters scopes have 9 kilograms in 1～0.1 millimeter scope.The granularity of above-mentioned flint clay is 0.1～1 millimeter.The granularity of above-mentioned kyanite is 150 orders.In above-mentioned 8 kilograms of superfine high aluminas, granularity is that 180 purpose particles have 3.2 kilograms, and 325 purpose particles have 4.8 kilograms.The granularity of above-mentioned compact alumina fine powder is 325 orders.The above-mentioned refractory castable for preparing is poured into the test block of 40mm * 40mm * 160mm according to a conventional method, and use mould material always with desulfur agitator and carry out the thermal shock resistance contrast experiment, be specially 1200 ℃ of water-cooleds experiments, the result is substantially the same manner as Example 1.
Embodiment 4:
Prepare 1031.5 kilograms of refractory pouring material used for melten iron desulfur agitator of the present invention, wherein: mould material base-material gross weight is 1000 kilograms, and the additive gross weight is 31.5 kilograms.Above-mentioned mould material base-material is by weight ratio by 600 kilograms of common electrofused mullites, 50 kilograms of flint claies, 50 kilograms of kyanites, 100 kilograms of superfine high aluminas, 40 kilograms of silicon powders, 80 kilograms of α-Al
2O
3Micro mist, 60 kilograms of pure calcium aluminate cements, 20 kilograms of compact alumina fine powders constitute.Above-mentioned additive is a mete-wand with 1000 kilograms of mould material base-materials, is made of 20 kilograms of heat-resistant steel fibers, 5 kilograms of metallic aluminium powders, 1.5 kilograms of tripoly phosphate sodium STPPs, 5 kilograms of trimeric cyanamides.The grain size distribution of above-mentioned 600 kilograms of common electrofused mullites is 0.1～8 millimeter, and wherein have 240 kilogram, granularity have 230 kilogram, granularity have 40 kilogram, granularity 3～1 millimeter scopes in 5～3 millimeter scopes in of granularity in 8～5 millimeters scopes have 90 kilograms in 1～0.1 millimeter scope.The granularity of above-mentioned flint clay is 0.1～1 millimeter.The granularity of above-mentioned kyanite is 150 orders.In above-mentioned 100 kilograms of superfine high aluminas, granularity is that 180 purpose particles have 50 kilograms, and 325 purpose particles have 50 kilograms.The granularity of above-mentioned compact alumina fine powder is 325 orders.By the said ratio repetitive operation for several times, obtain enough refractory castablies of many desulfur agitators of preparation, be sent to Wuhan Iron ﹠ Steel's second steelworks KR desulfur agitator and make the scene,, finished the making of several type approval test usefulness agitators according to agitator manufacture craft system.By type approval test, obtained agitator and be mean life 668 times excellent results, far above the actual production same period with agitator average 400～450 times work-ing life.
Refractory castable of the present invention, be highly suitable for the integrated poured of Thermal Equipment and the fire-resistant working lining of hot member under the rapid heat cycle working condition, be particularly suitable for the integrated poured of hot metal pretreatment field KR desulfur agitator refractory materials lining body and blowing desulfurization, dephosphorization spray gun fire proofed wood spray gun lining.
Claims (5)
1. refractory pouring material used for melten iron desulfur agitator, mixed by mould material base-material and an amount of additive, it is characterized in that: described mould material base-material is by weight ratio by 55～65% common electrofused mullite, 3～10% flint clay, 3～7% kyanite, 7～15% superfine high alumina, 3～6% silicon powder, α-Al of 5～10%
2O
3Micro mist, 3～10% pure calcium aluminate cement, 1.5～2.5% compact alumina fine powder constitute; Described additive is a mete-wand with the gross weight of described mould material base-material, the heat-resistant steel fiber by 1.5～2.5% ,≤0.5% Aluctyl and/or≤0.5% metallic aluminium powder ,≤0.3% tripoly phosphate sodium STPP and/or≤0.5% trimeric cyanamide constitutes.
2. refractory pouring material used for melten iron desulfur agitator according to claim 1 is characterized in that: said mould material base-material is by weight ratio by 56～60% common electrofused mullite, 5～8% flint clay, 4～6% kyanite, 9～13% superfine high alumina, 4～5% silicon powder, α-Al of 6～8%
2O
3Micro mist, 5～8% pure calcium aluminate cement, 2～2.5% compact alumina fine powder constitute; Said additive is a mete-wand with the gross weight of described mould material base-material, the heat-resistant steel fiber by 2～2.5% ,≤0.5% Aluctyl and/or≤0.5% metallic aluminium powder ,≤0.15% tripoly phosphate sodium STPP and/or≤0.5% trimeric cyanamide constitutes.
3. refractory pouring material used for melten iron desulfur agitator according to claim 1 and 2, it is characterized in that: in the said mould material base-material, the granularity of common electrofused mullite is 0.1～8 millimeter, the granularity of flint clay is 0.1～1 millimeter, the granularity of kyanite is 150 orders, superfine high alumina is that granularity is 180 orders and two kinds of particulate mixtures of 325 purposes, and the granularity of compact alumina fine powder is 325 orders.
4. refractory pouring material used for melten iron desulfur agitator according to claim 3, it is characterized in that: said granularity is in 0.1～8 millimeter the common electrofused mullite, granularity in 8～5 millimeters scopes account for 38～42%, granularity in 5～3 millimeters scopes account for 36～40%, granularity in 3～1 millimeters scopes account for 5～8%, granularity accounts for 12～17% in 1～0.1 millimeter scope.
5. refractory pouring material used for melten iron desulfur agitator according to claim 3 is characterized in that: in the said superfine high alumina, granularity is that 180 purpose particles account for 40～60%, and granularity is that 325 purpose particles account for 60～40%.
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