CN102503492A - Low-cost, low-density and high-CaO corundum castable and preparation method thereof - Google Patents
Low-cost, low-density and high-CaO corundum castable and preparation method thereof Download PDFInfo
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- CN102503492A CN102503492A CN2011103544988A CN201110354498A CN102503492A CN 102503492 A CN102503492 A CN 102503492A CN 2011103544988 A CN2011103544988 A CN 2011103544988A CN 201110354498 A CN201110354498 A CN 201110354498A CN 102503492 A CN102503492 A CN 102503492A
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Abstract
The invention relates to a low-cost, low-density and high-CaO corundum castable and a preparation method thereof. The low-cost, low-density and high-CaO corundum castable is prepared by adding industrial alumina powder on the basis of the conventional common corundum castable. Volume expansion caused by calcium hexaluminate generated in the corundum castable is compensated by using volume contraction caused by phase change of industrial alumina at a high temperature, so that the contradiction between the adding amount of cement and the volume stability of the castable is solved successfully. The invented castable has low volume density and low thermal conductivity coefficient, energy loss caused by the application of the castable to a high-temperature kiln can be reduced, and the aim of saving energy is fulfilled. The industrial alumina powder is added, so that the cost of the castable is reduced in a certain degree, and the competitive advantage of the castable is enhanced. The corundum castable prepared with the method can be widely applied in the high-temperature industrial fields of steel and iron, non-ferrous metals, ceramics, petrifaction, and the like.
Description
Technical field
The invention belongs to technical field of inorganic nonmetallic materials.Be specifically related to high CaO corundum pouring material of a kind of low-cost low density and preparation method thereof.
Background technology
Compare with the typing refractory product, unshape refractory has all obtained developing rapidly in countries in the world because of its advantage at production, labour productivity, operating efficiency, materials consumption, aspect such as energy-conservation.The more and more molded articles that substitute of one of unshape refractory principal item mould material are used for high temperature position.High-purity corundum pouring material is principal crystalline phase with the corundum, adopts aluminous cement and alumina powder to combine, and it consists of Al
2O
3-CaO two component system, the temperature that liquid phase occurs is up to 1900 ℃.During heat treated or use first, raise with temperature, the CaO in the mould material cement begins about 1350 ℃ and the aluminum oxide reaction, generates the tabular calcium hexaluminate crystal of six sides, and six side's platelike crystals are interspersed in the corundum skeleton, have improved the high-temperature behavior of material.High-purity corundum pouring material has excellent high-temperature behavior, owing to do not contain SiO in forming
2Etc. volatile oxide compound, thereby have excellent anti-reducing atmosphere ability, obtained widespread use in industries such as metallurgy, building materials, petrochemical compleies.
The problem that high-purity corundum pouring material exists at present mainly contains:
1, the contradiction between aluminous cement add-on and the mould material volume stability.Aluminous cement has decisive influence to the mould material performance; Increase the cement add-on and can improve mould material base substrate and oven dry back intensity; The volumetric expansion that reaction generation calcium hexaluminate produced under the high temperature when but the cement add-on was big is bigger, makes that the mould material volume stability is poor.The line velocity of variation of how reasonably controlling in the mould material heat-processed is a volume stability, is the key of preparing the excellent performance high-purity corundum pouring material.
2, when corundum pouring material does not receive the erosion action of slag and other medium, existing high-purity corundum pouring material is because density is big, thermal conductivity is higher, is unfavorable for energy-conservationly, causes energy dissipation easily.
3, high-purity corundum pouring material employing fused white corundum and/or plate diamond spar are main raw material, and adopt alumina powder and pure calcium aluminate cement to combine, and the raw material that adopts is synthesis material, makes that its cost is higher, has limited its large scale application.
Compare with fused white corundum with sintering plate corundum, commercial alumina is a kind of raw material wide, that price is low of originating.The production of the most employing of commercial alumina Bayer process that is: utilizes the circulation fluid that contains a large amount of free caustic alkali to handle bauxitic clay, and stripping wherein aluminum oxide obtains sodium aluminate solution.In sodium aluminate solution, add aluminium hydroxide crystal seed, just can divide through long-time stirring to parse crystalline aluminum hydroxide.The calcining of white lake ECDC thermophilic degree just can be obtained commercial alumina.Commercial alumina is loose crystalline powder, is the porosity and looseness shape, has free-flowing properties.The Al of commercial alumina
2O
3Content is generally more than 98%, and main mine is γ-Al mutually
2O
3, can change α-Al into through high-temperature calcination
2O
3Significant volumetric shrinkage takes place in (corundum) simultaneously.
Summary of the invention
To existing problem in the above-mentioned existing corundum pouring material technology, the present invention proposes high CaO corundum pouring material of a kind of low-cost low density and preparation method thereof.
The objective of the invention is to realize through following technical scheme: the high CaO corundum pouring material of described low-cost low density comprises corundum matter aggregate and fine powder, commercial alumina powder, activated alumina micro mist, pure calcium aluminate cement, water reducer; Described corundum matter aggregate and fine powder are the aggregate and the fine powder of fused white corundum or sintering plate corundum, or are fused white corundum and sintering plate corundum arbitrary proportion blended aggregate and fine powder; The weight percent of each raw material is:
Corundum matter aggregate 55～78%
Corundum matter fine powder 5～12%
Commercial alumina powder 4～16%
Activated alumina micro mist 4～12%
Pure calcium aluminate cement 5～15%;
It is 0.05～0.30% of above-mentioned raw materials weight that adding has water reducer, the add-on of water reducer.
The present invention adds the commercial alumina powder in corundum pouring material; Purpose is to utilize the good flowability of commercial alumina, loose porous characteristic and high-temperature calcination meeting that characteristics such as remarkable volumetric shrinkage take place; Reduce the corundum pouring material volume density to reach; The buffering calcium hexaluminate generates the effect of the volumetric expansion that produces, thereby prepares the high CaO corundum pouring material of low density that a kind of intensity is high, volume stability is good.
The chemical ingredients of fused white corundum described in the present invention requires to be Al
2O
3>=98.5%, the chemical ingredients of sintering plate corundum requires to be Al
2O
3>=99.0%.Corundum aggregate size scope is 8 ~ 0.088mm, corundum fine powder granularity requirements≤0.074mm.
Said commercial alumina efflorescence composition requires Al
2O
3>=98.0%, principal crystalline phase requires with γ-Al
2O
3Be main, granularity requirements is less than 180 μ m.
The present invention adopts the chemical ingredients of activated alumina micro mist to require Al
2O
3>=98.5%, median size requires≤5 μ m.Said pure calcium aluminate cement refers to Al
2O
3Content is 65～82% aluminous cement.
It is compound that said water reducer refers among tripoly phosphate sodium STPP, Sodium hexametaphosphate 99, paracyanogen amine condenses, the FS-10 one or more.
The preparation method of the high CaO corundum pouring material of the low-cost low density of the present invention is: with commercial alumina powder, activated alumina micro mist, pure calcium aluminate cement and water reducer thorough mixing evenly after; The aggregate and the fine powder that add fused white corundum and/or sintering plate corundum; Further thorough mixing promptly makes corundum pouring material of the present invention.
The present invention has the following advantages:
1, commercial alumina is that loose porous shape, volume density are little, joins in the mould material and can obviously reduce the volume density of mould material, thereby reduced the thermal conductivity of mould material, and calorific loss reduces when making it be applied to high temperature kiln.Compare with existing corundum pouring material, the weight of the mould material unit volume material requested of inventing is few, helps the refractory materials user and reduces cost.
2, commercial alumina undergoes phase transition under the high temperature, by γ-Al
2O
3Gradate and be α-Al
2O
3Volume obviously shrinks, and for the volumetric expansion that generates the calcium hexaluminate generation provides the space, has played good shock absorption, has kept the volume stability of mould material.
3, the commercial alumina main chemical compositions is Al
2O
3And corundum pouring material master material is in full accord, does not influence the high-temperature behavior of corundum pouring material after the adding.The commercial alumina principal crystalline phase is γ-Al
2O
3, reactive behavior is high, and easier and aluminous cement reaction generates calcium hexaluminate, thereby can when reducing the mould material volume density, keep the mechanical property of excellence.
4, compare with corundum, the commercial alumina price is lower, the source is wide.Replace the cost that corundum can reduce mould material with commercial alumina, improve the market competition advantage of product.Corundum pouring material manufacturing technique of the present invention is simple, is suitable for large-scale industrial production.
Embodiment
Characteristics of the present invention are through in corundum pouring material, adding commercial alumina; Reduced the cost of corundum pouring material; Reduce the volume density and the thermal conductivity of corundum pouring material, solved the contradiction between existing corundum pouring material CaO content and the mould material volume stability.The production technique of the high CaO corundum pouring material of low-cost low density is identical with the technology of present mould material.Main raw material (comprising aggregate and fine powder) is used with arbitrary proportion for sintering plate corundum or fused white corundum or both.Illustrate enforcement of the present invention and characteristics below, but the present invention is not limited to following embodiment, can substitutes mutually with arbitrary proportion between fused white corundum and the sintering plate corundum among the embodiment.
Embodiment 1: feed composition and proportioning (weight percent) are fused white corundum granulated aggregate 78%, fused white corundum fine powder 5%, commercial alumina powder 4%, activated alumina micro mist 8%, pure calcium aluminate cement 5%; The water reducer add-on is 0.05% of a raw material gross weight.
Embodiment 2: feed composition and proportioning (weight percent) are sintering plate corundum granulated aggregate 55%, sintering plate corundum fine powder 10%, commercial alumina powder 16%, activated alumina micro mist 4%, pure calcium aluminate cement 15%; The water reducer add-on is 0.20% of a raw material gross weight.
Embodiment 3: feed composition and proportioning (weight percent) are sintering plate corundum granulated aggregate 25%, fused white corundum particle 40%, fused white corundum fine powder 9%, commercial alumina powder 4%, activated alumina micro mist 12%, pure calcium aluminate cement 10%; The water reducer add-on is 0.30% of a raw material gross weight.
Embodiment 4: feed composition and proportioning (weight percent) are sintering plate corundum granulated aggregate 60%, sintering plate corundum fine powder 4%, fused white corundum fine powder 8%, commercial alumina powder 10%, activated alumina micro mist 7%, pure calcium aluminate cement 11%; The water reducer add-on is 0.25% of a raw material gross weight.
Embodiment 5: feed composition and proportioning (weight percent) be sintering plate corundum granulated aggregate 50%, fused white corundum particle 20%, sintering plate corundum fine powder 7%, fused white corundum fine powder 3%, commercial alumina powder 8%, activated alumina micro mist 4%, pure calcium aluminate cement 8%; The water reducer add-on is 0.15% of a raw material gross weight.
With aforementioned proportion commercial alumina powder, activated alumina micro mist, pure calcium aluminate cement and water reducer thorough mixing evenly after; The aggregate and the fine powder that add fused white corundum and/or sintering plate corundum; Further thorough mixing promptly makes corundum pouring material of the present invention.
Claims (8)
1. high CaO corundum pouring material of low-cost low density is characterized in that: described corundum pouring material comprises corundum matter aggregate and fine powder, commercial alumina powder, activated alumina micro mist, pure calcium aluminate cement, water reducer; Described corundum matter aggregate and fine powder are the aggregate and the fine powder of fused white corundum or sintering plate corundum, or are fused white corundum and sintering plate corundum arbitrary proportion blended aggregate and fine powder; The weight percent of each raw material is:
Corundum matter aggregate 55～78%
Corundum matter fine powder 5～12%
Commercial alumina powder 4～16%
Activated alumina micro mist 4～12%
Pure calcium aluminate cement 5～15%;
It is 0.05～0.30% of above-mentioned raw materials weight that adding has water reducer, the add-on of water reducer.
2. the high CaO corundum pouring material of low-cost low density according to claim 1 is characterized in that: the chemical ingredients of fused white corundum requires to be Al
2O
3>=98.5%, the chemical ingredients of sintering plate corundum requires to be Al
2O
3>=99.0%.
3. the high CaO corundum pouring material of low-cost low density according to claim 1 is characterized in that: corundum aggregate size scope is 8 ~ 0.088mm, and the corundum fine powder granularity is≤0.074mm.
4. the high CaO corundum pouring material of low-cost low density according to claim 1 is characterized in that: the Chemical Composition of commercial alumina powder requires Al
2O
3>=98.0%, crystalline phase requires with γ-Al
2O
3Be main, granularity requirements is less than 180 μ m.
5. the high CaO corundum pouring material of low-cost low density according to claim 1 is characterized in that: activated alumina micro mist chemical ingredients requires Al
2O
3>=98.5%, median size requires≤5 μ m.
6. corundum pouring material according to claim 1, it is characterized in that: pure calcium aluminate cement refers to Al
2O
3Content is 65～82% aluminous cement.
7. corundum pouring material according to claim 1 is characterized in that: described water reducer is that among tripoly phosphate sodium STPP, Sodium hexametaphosphate 99, paracyanogen amine condenses, the FS-10 one or more are compound.
8. preparation method according to the described corundum pouring material of claim 1; It is characterized in that: with commercial alumina powder, activated alumina micro mist, pure calcium aluminate cement and water reducer thorough mixing evenly after; The aggregate and the fine powder that add fused white corundum and/or sintering plate corundum; Further thorough mixing promptly makes corundum pouring material of the present invention.
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| CN103664202A (en) * | 2012-09-25 | 2014-03-26 | 天津振普筑炉衬里工程有限公司 | High-purity compact refractory castable used in high temperature hydrogen environment |
| CN107344859A (en) * | 2017-06-20 | 2017-11-14 | 长兴兴鹰新型耐火建材有限公司 | A kind of Midst density high alumina silicon carbide castable and preparation method thereof |
| CN108218358A (en) * | 2018-01-31 | 2018-06-29 | 河南东大高温节能材料有限公司 | A kind of aluminous cement-calcium silicate cement combined high temperature binding agent and preparation method thereof |
| CN108439961A (en) * | 2018-05-21 | 2018-08-24 | 中钢集团洛阳耐火材料研究院有限公司 | A kind of preparation method of the high-purity calcium hexaluminate of densification-corundum composite diphase material |
| CN109503182A (en) * | 2018-12-24 | 2019-03-22 | 中国有色集团晋铝耐材有限公司 | It is a kind of without siliceous gasification furnace dedicated pouring material and preparation method thereof |
| CN111620708A (en) * | 2020-06-16 | 2020-09-04 | 上海利尔耐火材料有限公司 | Preparation method of novel aluminum-calcium low-density self-flow castable |
| CN115724652A (en) * | 2022-12-21 | 2023-03-03 | 中钢集团洛阳耐火材料研究院有限公司 | Preparation method of low-density high-strength calcium feldspar heat insulation material for hydrogen metallurgy field |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103664202A (en) * | 2012-09-25 | 2014-03-26 | 天津振普筑炉衬里工程有限公司 | High-purity compact refractory castable used in high temperature hydrogen environment |
| CN107344859A (en) * | 2017-06-20 | 2017-11-14 | 长兴兴鹰新型耐火建材有限公司 | A kind of Midst density high alumina silicon carbide castable and preparation method thereof |
| CN107344859B (en) * | 2017-06-20 | 2019-09-06 | 长兴兴鹰新型耐火建材有限公司 | A kind of middle density high alumina silicon carbide castable and preparation method thereof |
| CN108218358A (en) * | 2018-01-31 | 2018-06-29 | 河南东大高温节能材料有限公司 | A kind of aluminous cement-calcium silicate cement combined high temperature binding agent and preparation method thereof |
| CN108439961A (en) * | 2018-05-21 | 2018-08-24 | 中钢集团洛阳耐火材料研究院有限公司 | A kind of preparation method of the high-purity calcium hexaluminate of densification-corundum composite diphase material |
| CN108439961B (en) * | 2018-05-21 | 2021-02-05 | 中钢集团洛阳耐火材料研究院有限公司 | Preparation method of compact high-purity calcium hexaluminate-corundum complex phase material |
| CN109503182A (en) * | 2018-12-24 | 2019-03-22 | 中国有色集团晋铝耐材有限公司 | It is a kind of without siliceous gasification furnace dedicated pouring material and preparation method thereof |
| CN111620708A (en) * | 2020-06-16 | 2020-09-04 | 上海利尔耐火材料有限公司 | Preparation method of novel aluminum-calcium low-density self-flow castable |
| CN115724652A (en) * | 2022-12-21 | 2023-03-03 | 中钢集团洛阳耐火材料研究院有限公司 | Preparation method of low-density high-strength calcium feldspar heat insulation material for hydrogen metallurgy field |
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Application publication date: 20120620 |