CN101525245B - High strength non-cement corundum castable material used in heating furnace - Google Patents
High strength non-cement corundum castable material used in heating furnace Download PDFInfo
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- CN101525245B CN101525245B CN2009100644811A CN200910064481A CN101525245B CN 101525245 B CN101525245 B CN 101525245B CN 2009100644811 A CN2009100644811 A CN 2009100644811A CN 200910064481 A CN200910064481 A CN 200910064481A CN 101525245 B CN101525245 B CN 101525245B
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Abstract
The present invention relates to high strength non-cement corundum castable material used in a heating furnace. The high strength non-cement corundum castable material used in the heating furnace is prepared by adding an amount of activated magnesia and high alumina bauxiteinto powder into Al2O3-SiO2 series non-cement corundum castable material. The activated magnesia and high alumina bauxite into power increase the temperature when the liquid phase of the non-cement corundum castable material begins to appear, improves the sintering character of pouring materials, solves the shortcoming that when the high strength non-cement corundum castable material used in the heating furnace is used, the thermal state rupture strength is lower, and obviously improves the elevated temperature performance of the castable materials. The high strength non-cement corundum castable material prepared by the invention is mainly used in the heating furnace used in iron and steel industries and high temperature condition of usage temperature of 1200 DEG C-1350 DEG C; the castable material also can be molded into prefabricated members by casting for being used.
Description
Technical field
The invention belongs to technical field of inorganic nonmetallic materials, be specifically related to a kind of high strength non-cement corundum castable material used in heating furnace.
Background technology
Along with the development of society, the energy-saving and cost-reducing concern that more and more is subjected to everybody.Pusher-type furnace is one of main type of furnace of heater for rolling steel, and the employing of no Water Cooling Technology has reduced the process furnace energy expenditure, has saved the energy, has reduced the gas waste that fuel combustion produces, and the development of this technology is subjected to everybody extensive concern.Adopt the process furnace of no Water Cooling Technology that its used mould material has been proposed higher technical requirements, require mould material to have better hot modulus of rupture and mechanical behavior under high temperature.It is multiple in conjunction with mould material, low cement, ultra-low cement and non-cement mould material etc. that the lining of process furnace work at present mainly contains clay with mould material.
U.S. ASTM C401-91 (2000) standard is according to CaO content difference, mould material is divided into traditional mould material (CC), low cement deposit material (LCC), ultra-low cement deposit material (ULCC) and four types of non-cement mould material (NCC), is classified as follows shown in the table.
The sorting technique of mould material
Clay relies on clay cohesion each other to produce combination down in conjunction with mould material normal temperature, so normal temperature strength is lower, the higher mechanical behavior under high temperature that makes of impurities of materials content is relatively poor in addition.As the renewal product of clay in conjunction with mould material, low cement and ultra-low cement deposit material produce combination by an amount of micro mist and the cement that adds, and make the mould material medium temperature intensity obtain to a certain degree improvement, but CaO that cement is introduced and the Al in the mould material
2O
3And SiO
2Reaction generates low melting point mineral such as lime feldspar, still is unfavorable for the mechanical behavior under high temperature of mould material.The non-cement mould material rely on to add the cohesion of fine powder, micro mist and the water close with the main material chemical ingredients and produces and combine, there is not to introduce the impurity that easily generates eutectic, belong to from combination, thereby have advantages such as refractoriness height, high-temperature behavior are good, become the main developing direction of process furnace with mould material.
Process furnace is mainly fine silica powder and alumina powder with the used wedding agent of non-cement corundum castable material at present, and adds the pure calcium aluminate cement of minute quantity, adds mass percent≤0.5%, CaO mass percent＜0.2% of introducing.It is the surface potential that changes micro mist by the calcium ion that its aquation produces impelling the micro mist cohesion that cement mainly acts on, and has improved the intensity of base substrate after the moulding to a certain extent.This makes the chemical constitution of non-cement corundum castable material still belong to Al
2O
3-SiO
2-CaO three-part system, the temperature that liquid phase appears in this system is 1512 ℃.
The magnesium ion that produces by suitable admixture aquation also can change the surface potential of micro mist, and impels it to solidify, and produces stronger MgO-SiO
2-H
2The O combination has guaranteed the blanks and moulding and conserving of mould material and the intensity after the oven dry.Raise with temperature, this combination can keep its catenate structure up to 600～700 ℃.This MgO-SiO
2-H
2O belongs to Al in conjunction with being widely used in the common alumina-magnesia castable of ladle
2O
3-MgO is a mould material, and this bonded produces to be by adding sintering or electrosmelted magnesite clinker particulate aquation and realizes.At Al
2O
3-SiO
2Be to yet there are no and report for work by adding the short technology of coagulating the aspect of minute quantity magnesia in the non-cement mould material, as add a spot of activated magnesia, utilize that its granularity is little, specific surface area is big, the characteristics of aquation easily, when add-on seldom, just can aquation produce a large amount of magnesium ions, improve the normal temperature performance of mould material to promote solidifying of mould material.Al when this just makes the chemical constitution of non-cement corundum castable material coagulate from cement is short
2O
3-SiO
2-CaO three-part system has become Al
2O
3-SiO
2-MgO three-part system, and Al
2O
3-SiO
2The temperature that liquid phase appears in-MgO system is 1578 ℃, compares Al
2O
3-SiO
2The appearance temperature of-CaO system liquid phase has improved 66 ℃, has obviously improved the fire performance of mould material.
Process furnace is a fused brown corundum with the main raw material of non-cement corundum castable material, and this raw material is by the electric smelting explained hereafter, and its crystal grain is big, reactive behavior is lower, sintering character is poor, and the process furnace use temperature is relatively low generally between 1200 ℃～1350 ℃.The sintering degree of mould material is relatively poor during actual the use, and matrix and aggregate can not get combination preferably, thereby hot modulus of rupture is lower.Compare with fused brown corundum, the alumine raw material makes by the natural bauxitic clay of sintering, and low price and reactive behavior are higher relatively, and micro mist reacts easily and in the mould material.In the alumine raw material be on good terms and play the effect of similar nucleus in a spot of mullite ore deposit, promote that aluminum oxide and fine silica powder generate the reaction of mullite in the mould material, thereby add sintering character and mechanical behavior under high temperature that a small amount of alumine fine powder can obviously improve mould material in the corundum castable.Mould material matrix is general to adopt the material higher slightly than aggregate class, adds in corundum castable that a small amount of alumina fine powder improves sintering character, the article and the patent that improve aspect the hot modulus of rupture are not seen report as yet.
Summary of the invention
A kind of high strength non-cement corundum castable material used in heating furnace that purpose of the present invention is developed at existing problem in the above-mentioned prior art just.
The object of the invention is to change the surface potential of fine silica powder and alumina powder by the magnesium ion that adds the generation of activated magnesia aquation, and impels it to solidify, and produces stronger MgO-SiO
2-H
2The O combination makes the mould material chemical constitution by Al
2O
3-SiO
2-CaO ternary system becomes Al
2O
3-SiO
2-MgO ternary system, that has improved low melting point liquid phase in the mould material begins to generate temperature, has improved the high-temperature behavior of mould material.Improve the sintering character of mould material by in mould material matrix, adding part alumine fine powder, make between alumine fine powder and the fine silica powder and mould material is inner produces good combination, improved the hot modulus of rupture of mould material.
The objective of the invention is to realize by following technology incidence of criminal offenses: high strength non-cement corundum castable material used in heating furnace of the present invention belongs to Al
2O
3-SiO
2System comprises fused brown corundum aggregate and fine powder, fine silica powder, activated alumina micro mist and water reducer; At Al of the present invention
2O
3-SiO
2Be to add alumine fine powder and activated magnesia in the mould material simultaneously, the chemical ingredients of described alumine fine powder requires Al
2O
3〉=84.5%, granularity≤0.088mm; Described activated magnesia chemical ingredients requires MgO 〉=92.0%, tap density≤0.1g/ml;
The mass percent of each raw material is as follows in the mould material of the present invention:
Fused brown corundum aggregate 65～70%
Fused brown corundum fine powder 8～10%
Fine silica powder 4～8%
Activated alumina micro mist 2～4%
Alumine fine powder 10～18%
Activated magnesia (adding) 0.2～0.5%
Water reducer (adding) 0.04～0.12%
In the present invention, the chemical ingredients of fused brown corundum aggregate and fine powder requires to be Al
2O
3〉=94.0%, fused brown corundum aggregate size scope is 8～0.088mm, the granularity≤0.088mm of fused brown corundum fine powder.
Described fine silica powder Chemical Composition requires SiO
2〉=96.0%, median size requires≤1 μ m.Described activated alumina micro mist chemical ingredients requires Al
2O
3〉=98.5%, median size requires≤5 μ m.
Described water reducer refers to lemon acids water reducer, can be citric acid or Trisodium Citrate or ammonium citrate.
The preparation process of high strength non-cement corundum castable material used in heating furnace is: with fused brown corundum particle and fine powder, fine silica powder, activated alumina micro mist, alumine fine powder, activated magnesia and water reducer, proportionally weighing and thorough mixing evenly after, make high strength non-cement corundum castable material used in heating furnace of the present invention.
The present invention has the following advantages:
1, changes the micro mist surface potential by adding activated magnesia aquation generation magnesium ion, and then promote it to solidify, produce stronger MgO-SiO
2-H
2The O combination makes Al
2O
3-SiO
2Be that non-cement corundum castable material has higher maintenance and oven dry back intensity.This MgO-SiO
2-H
2O still can keep stronger bonding strength after dewatering in conjunction with raising with temperature, up to 600～700 ℃, has kept the continuity of casting material strength with temperature.
2, after activated magnesia instead of pure aluminous cement was urged to coagulate, the chemical constitution of mould material was by Al
2O
3-SiO
2-CaO ternary system becomes Al
2O
3-SiO
2-MgO ternary system, in the mould material low melting point liquid phase begin generate temperature and improved 66 ℃ approximately, improved the high-temperature behavior of mould material.
4, the alumine fine powder of Jia Ruing has improved the sintering character of mould material, makes between alumina particle and the micro mist and mould material inside can be good at sintering together, has produced stronger combination, has obviously improved the hot modulus of rupture of mould material.
5, all adopt the non-cement corundum castable material of brown corundum fine powder to compare with the short coalescence of aluminous cement, the non-cement corundum castable material that adopts the short coalescence of activated magnesia to add part alumine fine powder has obviously reduced raw materials cost.The production technique of non-cement corundum castable material is simple, is suitable for large-scale industrial production.
Embodiment
Characteristics of the present invention are by adding activated magnesia in non-cement corundum castable material, substitute that traditional aluminous cement is short to coagulate, and that has improved low melting point liquid phase in the mould material begins to generate temperature.Simultaneously partly introduce an amount of alumine fine powder, improved the sintering character of mould material, promoted the combination between mould material matrix at the mould material fine powder.The employing of above-mentioned technology has obviously improved the hot modulus of rupture and the mechanical behavior under high temperature of non-cement corundum castable material, and has reduced the raw materials cost of mould material to a certain extent.For proving absolutely characteristics of the present invention, now be illustrated for example, but the present invention is not limited to following embodiment.Specific embodiment is as follows:
Embodiment 1: the each component proportioning is (mass percent) fused brown corundum particle 65%, fused brown corundum fine powder 9%, alumine fine powder 18%, fine silica powder 4%, activated alumina micro mist 4%, activated magnesia (adding) 0.2%, Trisodium Citrate 0.04% (adding).
Embodiment 2: the each component proportioning is (mass percent) fused brown corundum particle 67%, fused brown corundum fine powder 10%, alumine fine powder 16%, fine silica powder 5%, activated alumina micro mist 2%, activated magnesia (adding) 0.3%, citric acid 0.04% (adding).
Embodiment 3: the each component proportioning is (mass percent) fused brown corundum particle 68%, fused brown corundum fine powder 9%, alumine fine powder 14%, fine silica powder 6%, activated alumina micro mist 3%, activated magnesia (adding) 0.4%, ammonium citrate 0.08% (adding).
Embodiment 4: the each component proportioning is (mass percent) fused brown corundum particle 70%, fused brown corundum fine powder 8%, alumine fine powder 10%, fine silica powder 8%, activated alumina micro mist 4%, activated magnesia (adding) 0.5%, Trisodium Citrate 0.12% (adding).
The fused brown corundum particle of aforementioned proportion and fine powder, alumine fine powder, fine silica powder, activated alumina micro mist, activated magnesia and water reducer thorough mixing are promptly made high strength non-cement corundum castable material used in heating furnace of the present invention after evenly.Above-mentioned mould material is added an amount of water, (40mm * 40mm * 160mm) places the demoulding after 24 hours after mixing it to be poured into band sample, after 110 ℃ of oven dry and 1250 ℃ insulation was burnt in 3 hours, by the concerned countries standard performance of mould material sample is tested then, the results are shown in down subordinate list.
Subordinate list:
Claims (4)
1. high strength non-cement corundum castable material used in heating furnace, it belongs to Al
2O
3-SiO
2Be mould material, comprise fused brown corundum aggregate and fine powder, fine silica powder, activated alumina micro mist and water reducer; It is characterized in that: at Al
2O
3-SiO
2Be to add alumine fine powder and activated magnesia in the mould material, the chemical ingredients of described alumine fine powder requires Al
2O
3〉=84.5%, granularity≤0.088mm; Described activated magnesia chemical ingredients requires MgO 〉=92.0%, tap density≤0.1g/ml;
The mass percent of each raw material is as follows in the mould material:
2. a kind of high strength non-cement corundum castable material used in heating furnace according to claim 1 is characterized in that: the chemical ingredients of fused brown corundum aggregate and fine powder requires to be Al
2O
3〉=94.0%, fused brown corundum aggregate size scope is 8～0.088mm, the granularity≤0.088mm of fused brown corundum fine powder.
3. a kind of high strength non-cement corundum castable material used in heating furnace according to claim 1 is characterized in that: the fine silica powder Chemical Composition requires SiO
2〉=96.0%, median size requires≤1 μ m, and activated alumina micro mist chemical ingredients requires Al
2O
3〉=98.5%, median size requires≤5 μ m.
4. a kind of high strength non-cement corundum castable material used in heating furnace according to claim 1 is characterized in that: described water reducer is citric acid or Trisodium Citrate or ammonium citrate.
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| CN101525245B true CN101525245B (en) | 2011-09-21 |
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| CN102320851B (en) * | 2011-09-06 | 2013-03-27 | 天津市新发表面处理有限公司 | Lining material for mud-alkali co-combustion counter-current rotary kiln |
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| CN103121850B (en) * | 2012-07-04 | 2015-04-15 | 河南熔金高温材料股份有限公司 | Non-cement-bound corundum fabricated part and production method thereof |
| CN104211420B (en) * | 2014-09-15 | 2016-02-10 | 武汉科技大学 | A kind of light weight alumina-magnesia castable and preparation method thereof |
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| CN111892387A (en) * | 2020-08-11 | 2020-11-06 | 中钢南京环境工程技术研究院有限公司 | Preparation method of large-size thin high-temperature corundum-mullite slab |
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| CN114149271A (en) * | 2021-12-25 | 2022-03-08 | 郑州震达耐火材料有限公司 | Special high-strength corundum castable and preparation method thereof |
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| CN1262257A (en) * | 1999-01-28 | 2000-08-09 | 北京科技大学 | Process for preparing 'Meialong' magnesium ceramics with natural minerals as raw materials |
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