CN102276270A - Refractory material used for lance for molten iron pretreatment and application thereof - Google Patents
Refractory material used for lance for molten iron pretreatment and application thereof Download PDFInfo
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- CN102276270A CN102276270A CN201110174100A CN201110174100A CN102276270A CN 102276270 A CN102276270 A CN 102276270A CN 201110174100 A CN201110174100 A CN 201110174100A CN 201110174100 A CN201110174100 A CN 201110174100A CN 102276270 A CN102276270 A CN 102276270A
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Abstract
The invention discloses a refractory material used for a lance for molten iron pretreatment, and the material comprises the following components on a mass basis: 35-41% of mullite, 30-40% of andalusite, 9-12% of white corundum, 3-6% of alumina fine powder, 2-3% of silicon fine powder, 5% of binders, and 3% of steel fibers; the sum of the above components is 100%; in addition, the material also comprises other additives; other additives comprise 0.14% of water reducers, 0.1% of explosion-proof materials, and 0.2% of dispersants. Compared with the prior art, the lance for molten iron pretreatment of the invention has the following beneficial effect and obvious characteristics: a) the refractory material has quite good mutual adaptability with steel tubes from room temperature to 1500 DEG C; b) the refractory material has good thermal stability, erosion resistance against molten iron, and high strength and volume stability from room temperature to 1500 DEG C; c) steel tubes have quite high service strength from room temperature to 1500 DEG C.
Description
Technical field
The present invention relates to a kind of refractory materials, be specially a kind of hot metal pretreatment spray gun refractory materials that is applied to.
Background technology
Spray gun is to form at outer wall of steel pipe cast one deck refractory materials, during use spray gun is inserted in the molten iron, by the pulvis of steel pipe blowing desulfurization, phosphorus, silicon etc. in molten iron, is mainly used in hot metal pretreatment technology then.Hot metal pretreatment is as connecting the bridge of steel-making with blast furnace, be the important process means that improve steel products quality, expansion rolling shapes, reduce cost, optimize the process for making process, and desulfurization, phosphorus, silicon make spray gun become the important component part of hot metal pretreatment equipment as the very important task of hot metal pretreatment technology, make each steel industry both at home and abroad strengthen development and the improvement to it.
To be that steel pipe is little be 5mm as external diameter as Φ 60.5cm thickness to the characteristics of the spray gun that existing torpedo pot iron waterwheel uses, the about 4.5m of length, the rifle wall is poured into a mould the thick about 1.5cm～3cm of anti-material, and the molten iron temperature of desulfurization when handling is when jetting operation for 1380 ℃ ± 50 ℃, spray gun is with winding-up turnover torpedo jar, high temperature expansion low temperature shrinks, refractory materials (inorganic materials) and steel pipe (metallic substance) are owing to the difference of material character causes that the asynchronous meeting of volume change causes anti-material to peel off spray gun is very easily damaged, so that the work-ing life of spray gun is not high, and the time of the whole technology of influence steel-making in the work-ing life of spray gun, most important to reducing ton steel cost, so become the work-ing life of desulphurization spray gun desulphurization spray gun is researched and developed and improved common-denominator target.
Because the characteristics of the spray gun that the torpedo pot iron waterwheel uses are steel pipe, the thin thickness of anti-the material, temperature fluctuation is in room temperature～1400 ℃ during use, spray gun need be in molten iron anti-material anti-erosion, when anti-material cools off with steel pipe in air mutually coadaptation do not damage, use a month number of times to be not less than (being 4.2 torpedo pot iron waterwheels of every rifle average treatment) 4.2 times, be not less than 22 minutes each duration of service, so the mutual volume stability of the rapid heat cycle of refractory materials and steel pipe is extremely important.
Summary of the invention
The objective of the invention is in order to provide a kind of hot metal pretreatment spray gun with refractory materials and application thereof, to solve the problems referred to above of prior art.Not changing under existing spray gun structure, production technique and the working conditions, can improve desulphurization spray gun duration of service and life-span and thermal shock resistance, reduce ton steel cost.
Purpose of the present invention can be achieved through the following technical solutions.
A kind of hot metal pretreatment spray gun refractory materials, by massfraction, its component and content are: mullite 35-41%, andaluzite 30-40%, white fused alumina 9-12%, alumina powder 3-6%, silicon powder 2-3%, wedding agent 5%, steel fiber 3%; The said components sum is 100%; In addition, also include other additives; Other additives comprise the water reducer 0.14% that accounts for aforementioned component, and explosion-proof lamp is 0.1%, dispersion agent 0.2%.
Described mullite is that principal crystalline phase is not less than 85%, chemical ingredients Al
2O
3〉=73%, SiO
2≤ 25%, Fe
2O
3≤ 1.0% common mullite.
Described andaluzite is that principal crystalline phase is not less than 70%, chemical ingredients Al
2O
3〉=56%, Fe
2O
3≤ 1.2% common andaluzite.
Described white fused alumina is Al
2O
3〉=98%, Fe
2O
3≤ 0.5% high pure raw material.
Described alumina powder is granularity D
50=0.7 μ m, chemical ingredients Al
2O
3〉=99%, Fe
2O
3Active alpha-Al of≤0.5%
2O
3Micro mist.
Described silicon powder is granularity＜21 μ m, chemical ingredients SiO
2〉=94%, pH value is 6.8-7.1.
Described wedding agent is selected from any one or the two kinds of mixing in chemical bond, aquation wedding agent and the ceramic bond, and wherein chemical bond is selected from phosphoric acid or aluminium dihydrogen phosphate; The aquation wedding agent is high-alumina cement or pure calcium aluminate cement; Vitrified bond is selected from ρ-Al
2O
3Described wedding agent is the composition of aquation wedding agent and ceramic bond, and wherein the water hardening binding agent is that 4 parts, vitrified bond are 1 part.
Described steel fiber is the common molten type Stainless Steel Fibre of taking out of 0.2mm * 1mm * 20mm or 0.2mm * 1mm * 25mm.
The preferred SN-II of described water reducer (five or three auxiliary reagent factories, Shanghai), explosion-proof lamp preferably have in organic fiber, paper fiber, metallic aluminium powder and the metallic silicon power any one or its between composition.
The described dispersion agent that adds is any one or two kinds of mixing among tripoly phosphate sodium STPP, Sodium hexametaphosphate 99 and the FS20 (Shantou Economy Special Zone Longhu Science and Technology Co., Ltd).
The above raw material of selecting for use different grain size to form, the mould material of producing according to current technology by analysis, the n value of the continuous size-grade distribution system of the Andreasen of gained maintains the stable distribution of 0.3-0.4.
For achieving the above object, the present invention adopts cold drawing steel tube, and the performance of described material is as follows: steel pipe adopts the cold drawing steel tube based on the 20# of GB/T8162-1999;
Chemical ingredients: contain C≤0.25%, S≤0.05%, P≤0.05%, Si≤0.25%, Mn≤0.5%, Cr≤0.1%, Cu≤0.2%, Ni≤0.05%;
Stretch: tension T.S. 〉=450MPa, surrender Y.S. 〉=350MPa, elongation E.L. 〉=35%, and can be by bending and Eddy current test.
Be to strengthen the interoperability of refractory materials and steel pipe, so refractory materials of the present invention based on mullite, andaluzite, white fused alumina, and is allocated appropriate amount of alumina micro mist and silicon powder into.Because of can mullitization taking place under the high temperature of molten iron, the andaluzite fine powder produces more stable volumetric expansion, the SiO that separates out
2Reaction generates secondary mullite in the time of can contacting with alumina powder in the material or white fused alumina, the generation of mullite can not only improve the volume stability and the structural strength of goods, improve to burn the back line and change, and can also partly eliminate shrinkage crack that mould material produces and cause and peel off and influence the weakness in work-ing life in high temperature and process of cooling; Employing has good working strength based on the 20# cold drawing steel tube of GB/T8162-1999 between 0 ℃-1500 ℃, and and refractory materials between have good interoperability at 0 ℃-1500 ℃.
Refractory materials and steel pipe coefficient of expansion in molten iron can make up mutually between 0 ℃-1500 ℃, and the difference that can not produce owing to both coefficients of expansion causes breaking of peeling off of refractory materials or steel pipe; Spray gun disposes the back in molten iron can phase coadaptation when reducing to 0 ℃ for 1400 ℃ preferably when exposing in the air, can not cause the distortion with steel pipe of peeling off of refractory materials owing to the difference of both coefficients of expansion.
Compared with prior art, hot metal pretreatment spray gun of the present invention has following beneficial effect and obvious characteristic:
A) refractory materials and steel pipe ℃ have good interoperability in room temperature～1500;
B) refractory materials Heat stability is good, anti-molten iron corrodes, and ℃ has high strength and volume stability in room temperature～1500;
C) steel pipe has very high working strength between room temperature～1500 ℃.
Embodiment
The present invention is described in further detail and completely below in conjunction with embodiment:
By the hot metal pretreatment spray gun of present embodiment prescription cast preparation with the physicochemical property of refractory materials and steel pipe see Table 1, shown in the table 2.
Composition and the content of table 1 embodiment 1-5.
| Raw material | Granularity (mm) | Example 1 | Example 2 | Example 3 | Example 4 | Example 5 |
| Mullite 1 | 5-0 | 25 | 28 | 25 | 26 | 32 |
| Mullite 2 | Micro mist | 10 | 10 | 15 | 15 | 12 |
| Andaluzite | 3-0 | 40 | 36 | 35 | 34 | 30 |
| Fused white corundum | 1-0 | 9 | 10 | 11 | 11 | 12 |
| Active alpha-Al 2O 3Micro mist | D 50＝0.7μm | 6 | 5 | 3 | 4 | 3 |
| Lafarge cement | ＜0.021 | 5 | 5 | 5 | 5 | 5 |
| Silicon powder | ＜0.021 | 2 | 3 | 3 | 2 | 3 |
| Steel fiber | 3 | 3 | 3 | 3 | 3 | |
| Tripoly phosphate sodium STPP | 0.1 | 0.2 | ||||
| Sodium hexametaphosphate 99 | 0.2 | 0.1 | ||||
| SN-II | 0.14 | 0.14 | 0.14 | 0.14 | 0.14 | |
| FS-20 | 0.1 | 0.2 | 0.1 | |||
| Metallic aluminium powder | 0.1 | 0.1 | ||||
| Metallic silicon power | 0.1 | 0.1 | ||||
| Sodium carboxymethylcellulose pyce | 0.1 | |||||
| * add water | 5.8 | 5.8 | 5.8 | 5.8 | 5.8 |
* adding water, is because the raw material outside dewatering mixes the back for pulvis, need add water and be coated on the spray gun then.
The physicochemical property data of the steel pipe that table 2 the foregoing description is adopted
The physicochemical property of pouring into a mould the molten iron desulfuring spray gun of preparation by the present embodiment prescription is shown in Table 3.
Every physicochemical property parametric measurement carries out according to following standard respectively in the table 3:
Volume density is measured according to YB/T5200-1933;
Cold crushing strength is measured according to YB/T5201-1993;
Strength at normal temperature is measured according to YB/T5201-1993;
High temperature break resistant intensity is measured according to GB/T3002-2004;
Thermal shock resistance is measured according to YB/T2206.2-1998;
The line velocity of variation is measured according to YB/T5203-1993;
W (Al
2O
3)/% measures according to GB/T6900.4-1986;
W (SiO
2)/% measures according to GB/T6900.2-1986YB.
The physicochemical property data of the molten iron desulfuring spray gun of table 3 the various embodiments described above prescription cast preparation
As seen, the physicochemical property of the molten iron desulfuring spray gun of employing refractory materials production of the present invention is good.
Claims (13)
1. hot metal pretreatment spray gun refractory materials, it is characterized in that: by massfraction, its component and content are: mullite 35-41%, andaluzite 30-40%, white fused alumina 9-12%, alumina powder 3-6%, silicon powder 2-3%, wedding agent 5%, steel fiber 3%; The said components sum is 100%; In addition, also include other additives.
2. hot metal pretreatment spray gun refractory materials according to claim 1 is characterized in that: other additives comprise the water reducer 0.14% that accounts for aforementioned component, and explosion-proof lamp is 0.1%, dispersion agent 0.2%.
3. hot metal pretreatment spray gun refractory materials according to claim 1 is characterized in that: described mullite is that principal crystalline phase is not less than 85%, chemical ingredients Al
2O
3〉=73%, SiO
2≤ 25%, Fe
2O
3≤ 1.0% common mullite.
4. hot metal pretreatment spray gun refractory materials according to claim 1 is characterized in that: described andaluzite is that principal crystalline phase is not less than 70%, chemical ingredients Al
2O
3〉=56%, Fe
2O
3≤ 1.2% common andaluzite.
5. hot metal pretreatment spray gun refractory materials according to claim 1 is characterized in that: described white fused alumina is Al
2O
3〉=98%, Fe
2O
3≤ 0.5% high pure raw material.
6. hot metal pretreatment spray gun refractory materials according to claim 1 is characterized in that: described alumina powder is granularity D
50=0.7 μ m, chemical ingredients Al
2O
3〉=99%, Fe
2O
3Active alpha-Al of≤0.5%
2O
3Micro mist.
7. hot metal pretreatment spray gun refractory materials according to claim 1 is characterized in that: described silicon powder is granularity＜21 μ m, chemical ingredients SiO
2〉=94%, pH value is 6.8-7.1.
8. hot metal pretreatment spray gun refractory materials according to claim 1, it is characterized in that: described wedding agent is selected from any one or the two kinds of mixing in chemical bond, aquation wedding agent and the ceramic bond, and wherein chemical bond is selected from phosphoric acid or aluminium dihydrogen phosphate; The aquation wedding agent is high-alumina cement or pure calcium aluminate cement; Vitrified bond is selected from ρ-Al
2O
3
9. hot metal pretreatment spray gun refractory materials according to claim 8 is characterized in that: when described wedding agent was the composition of aquation wedding agent and ceramic bond, wherein the water hardening binding agent was that 4 parts, vitrified bond are 1 part.
10. hot metal pretreatment spray gun refractory materials according to claim 1 is characterized in that: described steel fiber is the common molten type Stainless Steel Fibre of taking out of 0.2mm * 1mm * 20mm or 0.2mm * 1mm * 25mm.
11. hot metal pretreatment spray gun refractory materials according to claim 2 is characterized in that: described water reducer is selected from SN-II, explosion-proof lamp be selected from organic fibre, paper fiber, metallic aluminium powder and the metallic silicon power any one or its between composition.
12. hot metal pretreatment spray gun refractory materials according to claim 2 is characterized in that: described dispersion agent is any one or the two kinds of mixing among tripoly phosphate sodium STPP, Sodium hexametaphosphate 99 and the FS20.
13. hot metal pretreatment spray gun refractory materials according to claim 1 is characterized in that: the cold drawing steel tube that is coated on the 20# of GB/T8162-1999.
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|---|---|---|---|
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|---|---|---|---|
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102617159A (en) * | 2012-03-15 | 2012-08-01 | 苏州伊索来特耐火纤维有限公司 | High-wind speed resistance capacity wear-resistant fiber surface coating |
| CN105819871A (en) * | 2016-03-15 | 2016-08-03 | 北京利尔高温材料股份有限公司 | Air blowing and slag removing spray gun for foundry ladle and preparation method thereof |
| CN106001525A (en) * | 2016-06-27 | 2016-10-12 | 宜兴市龙宸炉料有限公司 | Novel long-life heat-preservation continuous casting tundish cover |
| CN108117401A (en) * | 2017-12-26 | 2018-06-05 | 河南欣昌耐材股份有限公司 | A kind of ladle permanent layer quick-drying gravity flow pouring material |
| CN109095934A (en) * | 2018-09-30 | 2018-12-28 | 巩义市益鑫耐火材料厂 | Durable dephosphorization rifle castable and preparation method thereof |
| CN111041146A (en) * | 2019-12-03 | 2020-04-21 | 莱芜钢铁集团新兴液气有限公司 | Refractory material piece and molten iron pretreatment desulfurization spray gun with same |
| CN113582674A (en) * | 2021-06-30 | 2021-11-02 | 江苏正达炉料有限公司 | Long-life desulfurization spray gun refractory part and preparation process thereof |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102617159A (en) * | 2012-03-15 | 2012-08-01 | 苏州伊索来特耐火纤维有限公司 | High-wind speed resistance capacity wear-resistant fiber surface coating |
| CN102617159B (en) * | 2012-03-15 | 2014-04-16 | 苏州伊索来特耐火纤维有限公司 | High-wind speed resistance capacity wear-resistant fiber surface coating |
| CN105819871A (en) * | 2016-03-15 | 2016-08-03 | 北京利尔高温材料股份有限公司 | Air blowing and slag removing spray gun for foundry ladle and preparation method thereof |
| CN106001525A (en) * | 2016-06-27 | 2016-10-12 | 宜兴市龙宸炉料有限公司 | Novel long-life heat-preservation continuous casting tundish cover |
| CN108117401A (en) * | 2017-12-26 | 2018-06-05 | 河南欣昌耐材股份有限公司 | A kind of ladle permanent layer quick-drying gravity flow pouring material |
| CN108117401B (en) * | 2017-12-26 | 2020-09-29 | 河南欣昌耐材股份有限公司 | Quick-drying self-flow castable for permanent layer of ladle |
| CN109095934A (en) * | 2018-09-30 | 2018-12-28 | 巩义市益鑫耐火材料厂 | Durable dephosphorization rifle castable and preparation method thereof |
| CN111041146A (en) * | 2019-12-03 | 2020-04-21 | 莱芜钢铁集团新兴液气有限公司 | Refractory material piece and molten iron pretreatment desulfurization spray gun with same |
| CN113582674A (en) * | 2021-06-30 | 2021-11-02 | 江苏正达炉料有限公司 | Long-life desulfurization spray gun refractory part and preparation process thereof |
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Application publication date: 20111214 |