CN102249715A - Hollow chrome corundum spheres and preparation method thereof - Google Patents
Hollow chrome corundum spheres and preparation method thereof Download PDFInfo
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- CN102249715A CN102249715A CN2011101456272A CN201110145627A CN102249715A CN 102249715 A CN102249715 A CN 102249715A CN 2011101456272 A CN2011101456272 A CN 2011101456272A CN 201110145627 A CN201110145627 A CN 201110145627A CN 102249715 A CN102249715 A CN 102249715A
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Abstract
The invention discloses hollow chrome corundum spheres. The hollow chrome corundum spheres contain the following components in percentage by mass: 70 to 99.9 percent of Al2O3, and 0.1 to 30 percent of Cr2O3. The hollow chrome corundum spheres are prepared by the following steps of: selecting various aluminum-containing substances and chrome-containing substances as main raw materials, simultaneously introducing an additive to regulate the components and the viscosity of a melt, smelting in a three-phase alternating current arc ore heating furnace or a direct current arc ore heating furnace, pouring the melt, blowing the melt by using air, and then screening to obtain the hollow chrome corundum spheres with diameter of 0.2 to 5 millimeters. The invention provides the hollow chrome corundum spheres with low cost, abrasion resistance, erosion resistance, thermal shock resistance and good practicability and a preparation method thereof.
Description
Technical field
The present invention relates to belong to technical field of refractory materials, especially a kind of hollow ball and preparation method thereof.
Background technology
In traditional energy exhaustion and today of new forms of energy slower development day by day, the most urgent current task is that exploitation lightweight, high-strength, good thermal shock stability, use temperature high energy satisfy the required inner lining material of light structures High Temperature Furnaces Heating Apparatus, change that traditional ultrahigh-temperature kiln is big owing to the thermal capacity that adopts the heavy structure to exist, temperature rise rate is low, energy consumption is big, work-ing life is short, maintenance capacity in mid-term shortcoming such as big, save energy, cut down the consumption of energy, for building a resource-conserving society and the human kind sustainable development service.
Because light heat insulation material is to obtain lower thermal conductivity by the mode of introducing pore, introduce serious, the compressive resistance reduction of the raising of reheating linear shrinkage ratio, refractoriness under load reduction, high-temerature creep that a large amount of pores can cause light material, thereby the serviceability temperature that makes heat-barrier material is difficult to improve, and range of application is restricted, therefore seeking new method prepares the focus that new high temperature insulating material is the various countries expert always.In existing lagging material, aluminum oxide lagging material kind is maximum, the use temperature height, heat-insulating and energy-saving is effective, it is the lagging material of giving priority to now, wherein the application of lightweight alumina hollow ball pottery is a sign of lagging material technical progress, it has overcome, and original foamed alumina product strength is low, the shortcoming of high-temperature creep resistance difference, can directly contact flame, also can be used as high temperature inner lining structure material uses, can promote the transformation of conventional high-temperature furnace construction, for design novel kiln structure lays the foundation.Alumina hollow ball is a kind of high temperature insulating material of excellent performance, it is to form with the higher aluminum oxide melting blowing in electric furnace of purity, with the alumina hollow ball is that main body can be made into the different shape goods, 1800 ℃ of maximum operation (service) temperatures, products machinery intensity height, be the several times of general light weight product, and volume density can reach corundum products half in addition lower.Employing can also be prepared the zirconium white hollow ball with quadrat method, and use temperature also can reach more than 2100 ℃, but because therefore the zirconium white expensive raw material price is difficult to large-scale promotion application in industrial production.Simultaneous oxidation aluminium hollow ball is difficult to obtain large-scale application also because of cost performance, and with respect to the total amount of refractory materials, ratio is less.The hollow ball of present existing several materials, the temperature that needs in the fusion process is higher, not only quite high with electric energy consumption, preparation condition is required very harsh, for relevant auxiliary facility acid test is arranged all, and composition is more single, and the performance at aspects such as anti-erosion, heat-shock resistances has much room for improvement, and use range also is restricted.Be further to expand the range of application of hollow ball, particularly based on proposition and the portioned product develop of the structure of hollow ball/heat-insulating integrated composite brick concept, the basis of establishing electric smelting hollow ball step large-scale application.Both structure/heat-insulating integrated composite brick be composited by heavy working lining/light heat insulation layer, and the different components working lining needs the electric smelting hollow ball coupling of different components, otherwise is prone to surface reaction, influences product properties.
In addition, mould material based on low-cost electric smelting hollow ball occurs, different environment for use conditions has put forward different component requirements, the electric smelting hollow ball that requires that has has better heat-shock resistance, what have requires better wear resistance and corrosion resistance strong, the requirement low cost that has, these all need the raw material of different components and different costs specifically to satisfy these requirements.
Summary of the invention
Can not take into account low cost, wear resistance and corrosion resistance and heat-shock resistance, the relatively poor deficiency of suitability for what overcome existing hollow ball and preparation method thereof, the invention provides and to take into account low cost, wear resistance and corrosion resistance and heat-shock resistance simultaneously, have chromium corundum hollow ball of good applicability and preparation method thereof.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of hollow chrome corundum spheres contains Al in the described hollow chrome corundum spheres
2O
3And Cr
2O
3, Al wherein
2O
3The quality percentage composition is 70～99.9%, Cr
2O
3The quality percentage composition is 0.1～30%.
Among the present invention, since purification technique restriction in material purity and the production technology, Al
2O
3And Cr
2O
3Quality percentage composition sum contains a certain amount of other material less than 100% in the hollow ball, but does not affect use.
A kind of preparation method of chromium corundum hollow ball, described preparation method's step is as follows:
1) with aluminium-containing substance with contain chromium material mixing in proportion, or with aluminium-containing substance, contain chromium material and additive by the ratio requirement mixing, obtain admixtion;
2) batch is dropped in three-phase or the direct current electric arc furnace, adjust electric current and voltage, until melting, refining 10～80 minutes makes Al in the melt 2700～3100 ℃ of meltings
2O
3+ Cr
2O
3The quality percentage composition is not less than 90%;
3) melting finishes, the turndown winding-up;
4) ball is sieved the chromium corundum hollow ball that obtains 0.2～5mm.
Further, described aluminium-containing substance is one or more a arbitrary combination of commercial alumina, aluminium hydroxide, alumine or aluminium slag.
The described chromium material that contains is chrome ore or chromium oxide powder.
Described additive is a carbon materials, and as the desiliconization material, consumption is SiO in the admixtion
21.2～4 times of mole number.
Described additive is the mixture of carbon materials and iron content component substances, and the carbon materials consumption is SiO in the admixtion
20.8～3 times of mole number, the iron molar content is SiO in the admixtion in the iron content component substances
22～5 times of mole number.
Described carbon materials is graphite, refinery coke, forge one or more the arbitrary combination in back Jiao, coal, coke, pitch or the charcoal.
Described iron content component substances is one or more the arbitrary combination in iron filings, iron ore, iron oxide red, iron oxide black, scrap iron or the steel scrap.
Among the present invention, the know-why of institute's foundation is for various aluminium-containing substances or to contain the chromium material be main raw material, introduce additive simultaneously and adjust melt composition and viscosity, make the zircon corundum hollow ball, make it to have the functional character different with the hollow ball of other components by the winding-up melt.
Beneficial effect of the present invention mainly shows: prepared chromium corundum hollow ball has characteristics such as compressive strength height, fracture toughness property be good, and thermal and insulating performance is good, be especially suitable for use as the aggregate in lagging material and the lightening casting material, the heat insulating requirement of low temperature working conditions in can satisfying.
Embodiment
Below the invention will be further described.
Embodiment 1:
In the present embodiment, Al in the pink fused alumina high-temperature resistant hollow spheres
2O
3The quality percentage composition is 77.5.%, Cr
2O
3The quality percentage composition be 17.5%, the quality percentage composition of other materials is 5% because purification technique restriction in material purity and the production technology, Al
2O
3And Cr
2O
3Quality percentage composition sum contains a certain amount of other material less than 100% in the hollow ball, but does not affect use.
The preparation method is: proportioning raw materials adopts the quality percentage composition, and wherein commercial alumina 75%, chrome ore 25% adopt graphite as additive, and the consumption of graphite guarantees that the C molar weight is SiO in the batching in the graphite
24 times of molar weight; The raw material back of working good was mixed in ball mill 1 hour; Admixtion is dropped in the three-phawse arc furnace, adjust electric current and voltage 2800 ℃ of meltings, refining 40 minutes; Melting finishes, the turndown winding-up; The ball screening is obtained the high temperature resistant hollow ball of chromium corundum of 0.2～5mm.Al in the pink fused alumina high-temperature resistant hollow spheres
2O
3The quality percentage composition is 77.5.%, Cr
2O
3The quality percentage composition be 17.5%, product can be used as high-strength light castable and light-weight brick aggregate.
Embodiment 2:
In the present embodiment, Al in the pink fused alumina high-temperature resistant hollow spheres
2O
3The quality percentage composition is 80.9%, Cr
2O
3The quality percentage composition be 14.1%, the quality percentage composition of other materials is 5% because purification technique restriction in material purity and the production technology, Al
2O
3And Cr
2O
3Quality percentage composition sum contains a certain amount of other material less than 100% in the hollow ball, but does not affect use.
The preparation method is: proportioning raw materials adopts the quality percentage composition, and wherein chrome ore 10%, chromic oxide 10% and aluminium slag 80% adopt coke, charcoal and iron ore as additive, and the consumption of coke and charcoal guarantees that the C molar weight is SiO in the batching
23 times of molar weight, the consumption of iron ore guarantee that the Fe molar weight is SiO in the batching
22 times of molar weight; The raw material back of working good was mixed in ball mill 1.6 hours; Admixtion is dropped in the direct current electric arc furnace, adjust electric current and voltage 3100 ℃ of meltings to fusion, refining 10 minutes; Melting finishes, the turndown winding-up; The ball screening is obtained the high temperature resistant hollow ball of chromium corundum of 0.2～5mm.Al in the pink fused alumina high-temperature resistant hollow spheres
2O
3The quality percentage composition is 80.9%, Cr
2O
3The quality percentage composition be 14.1%, product can be used as high-strength light castable and light-weight brick aggregate.
Embodiment 3:
In the present embodiment, Al in the pink fused alumina high-temperature resistant hollow spheres
2O
3The quality percentage composition is 77.8%, Cr
2O
3The quality percentage composition be 17.2%, the quality percentage composition of other materials is 5% because purification technique restriction in material purity and the production technology, Al
2O
3And Cr
2O
3Quality percentage composition sum contains a certain amount of other material less than 100% in the hollow ball, but does not affect use.
The preparation method is: proportioning raw materials adopts the quality percentage composition, wherein commercial alumina 50%, alumine 30%, chrome ore 10%, chromium oxide powder 10%, adopt graphite, refinery coke, scrap iron, iron and iron oxide red as additive, the consumption of graphite, refinery coke guarantees that the C molar weight is SiO in the batching
20.8 times of molar weight, the consumption of scrap iron, iron and iron oxide red guarantee that the molar weight of Fe is SiO in the batching
25 times of molar weight; The raw material back of working good was mixed in ball mill 1.8 hours; Admixtion is dropped in the direct current electric arc furnace, adjust electric current and voltage 2900 ℃ of meltings to fusion, refining 20 minutes; Melting finishes, the turndown winding-up; The ball screening is obtained the high temperature resistant hollow ball of chromium corundum of 0.2～5mm.Al in the pink fused alumina high-temperature resistant hollow spheres
2O
3The quality percentage composition is 77.8%, Cr
2O
3The quality percentage composition be 17.2%, product can be used as high-strength light castable and light-weight brick aggregate.
Embodiment 4:
In the present embodiment, Al in the pink fused alumina high-temperature resistant hollow spheres
2O
3The quality percentage composition is 73.6%, Cr
2O
3The quality percentage composition be 21.4%, the quality percentage composition of other materials is 5% because purification technique restriction in material purity and the production technology, Al
2O
3And Cr
2O
3Quality percentage composition sum contains a certain amount of other material less than 100% in the hollow ball, but does not affect use.
The preparation method is: the raw material proportioning adopts the quality percentage composition, and wherein aluminium hydroxide 80%, chrome ore 15%, chromium oxide powder 5% adopt calcined coke, iron oxide black and steel scrap as additive, and the consumption of calcined coke guarantees that the C mole is SiO in the batching
22 times of mole, the consumption of iron oxide black and steel scrap guarantee that the Fe mole is SiO in the batching
23.5 times of mole; In ball mill, mixed 1.6 hours after raw material worked good; Batch is dropped in the direct current electric arc furnace, adjust electric current and voltage 2700 ℃ of meltings to melting, refining 80 minutes; Melting finishes, the turndown winding-up; The ball screening is obtained the pink fused alumina high-temperature resistant hollow spheres of 0.2～5mm.Al in the pink fused alumina high-temperature resistant hollow spheres
2O
3The quality percentage composition is 73.6%, Cr
2O
3The quality percentage composition be 21.4%, product can be used as high-strength light castable and light-weight brick aggregate.
Embodiment 5:
In the present embodiment, Al in the pink fused alumina high-temperature resistant hollow spheres
2O
3The quality percentage composition is 90.5%, Cr
2O
3The quality percentage composition be 4.5%, the quality percentage composition of other materials is 5% because purification technique restriction in material purity and the production technology, Al
2O
3And Cr
2O
3Quality percentage composition sum contains a certain amount of other material less than 100% in the hollow ball, but does not affect use.
The preparation method is: proportioning raw materials adopts the quality percentage composition, and wherein alumine 94%, chrome ore 6% adopt pitch, coal and iron filings as additive, and the consumption of pitch and coal guarantees that the C molar weight is SiO in the batching
20.8 times of molar weight, the consumption of iron filings guarantee that the Fe molar weight is SiO in the batching
25 times of molar weight; The raw material back of working good was mixed in ball mill 1.9 hours; Admixtion is dropped in the direct current electric arc furnace, adjust electric current and voltage 3000 ℃ of meltings to fusion, refining 50 minutes; Melting finishes, the turndown winding-up; The ball screening is obtained the high temperature resistant hollow ball of chromium corundum of 0.2～5mm.Al in the pink fused alumina high-temperature resistant hollow spheres
2O
3The quality percentage composition is 90.5%, Cr
2O
3The quality percentage composition be 4.5%, product can be used as high-strength light castable and light-weight brick aggregate.
Embodiment 6:
In the present embodiment, Al in the pink fused alumina high-temperature resistant hollow spheres
2O
3The quality percentage composition is 78.3%, Cr
2O
3The quality percentage composition be 16.7%, the quality percentage composition of other materials is 5% because purification technique restriction in material purity and the production technology, Al
2O
3And Cr
2O
3Quality percentage composition sum contains a certain amount of other material less than 100% in the hollow ball, but does not affect use.
The preparation method is: proportioning raw materials adopts quality percentage composition, wherein aluminium hydroxide 87.76% and high-purity chromic oxide 12.24%; The raw material back of working good was mixed in ball mill 1.9 hours; Admixtion is dropped in the direct current electric arc furnace, adjust electric current and voltage 3000 ℃ of meltings to fusion, refining 50 minutes; Melting finishes, the turndown winding-up; The ball screening is obtained the high temperature resistant hollow ball of chromium corundum of 0.2～5mm.Al in the pink fused alumina high-temperature resistant hollow spheres
2O
3The quality percentage composition is 78.3%, Cr
2O
3The quality percentage composition be 16.7%, product can be used as high-strength light castable and light-weight brick aggregate.
Embodiment 7
In the present embodiment, Al
2O
3The quality percentage composition is 70%, Cr
2O
3The quality percentage composition be 30.0%.
The preparation method is: the raw material proportioning adopts quality percentage composition, wherein high purity aluminium hydroxide [Al (OH)
3The quality percentage composition greater than 99.99%] 78.11% and high-purity chromium oxide [Cr
2O
3The quality percentage composition greater than 99.99%] 21.89%; In ball mill, mixed 1.9 hours after raw material worked good; Batch is dropped in the direct current electric arc furnace, adjust electric current and voltage 3000 ℃ of meltings to melting, refining 50 minutes; Melting finishes, the turndown winding-up; The ball screening is obtained the pink fused alumina high-temperature resistant hollow spheres of 0.2～5mm.Al in the pink fused alumina high-temperature resistant hollow spheres
2O
3The quality percentage composition is 70%, Cr
2O
3The quality percentage composition be 30.0%, product can be used as high-strength light castable and light-weight brick aggregate.
Embodiment 8
In the present embodiment, Al in the pink fused alumina high-temperature resistant hollow spheres
2O
3The quality percentage composition is 99.9%, Cr
2O
3The quality percentage composition be 0.1%.
The preparation method is: the raw material proportioning adopts quality percentage composition, wherein high purity aluminium hydroxide [Al (OH)
3The quality percentage composition greater than 99.99%] 99.93%, high-purity chromium oxide [Cr
2O
3The quality percentage composition greater than 99.99%] 0.07%; In ball mill, mixed 1.9 hours after raw material worked good; Batch is dropped in the direct current electric arc furnace, adjust electric current and voltage 3000 ℃ of meltings to melting, refining 50 minutes; Melting finishes, the turndown winding-up; The ball screening is obtained the pink fused alumina high-temperature resistant hollow spheres of 0.2～5mm.Al in the pink fused alumina high-temperature resistant hollow spheres
2O
3The quality percentage composition is 99.9%, Cr
2O
3The quality percentage composition be 0.1%, product can be used as high-strength light castable and light-weight brick aggregate.
Above-described embodiment only is for example clearly is described, is not the restriction that embodiment is done.For the person of an ordinary skill in the technical field; can also make other multi-form variation or changes on the basis of the above description; can't give an example one by one to all embodiments at this, and draw the conspicuous variation of extension thus or change still within the protection domain of the invention.
Claims (8)
1. a hollow chrome corundum spheres is characterized in that: contain Al in the described hollow chrome corundum spheres
2O
3And Cr
2O
3, Al wherein
2O
3The quality percentage composition is 70～99.9%, Cr
2O
3The quality percentage composition is 0.1～30%.
2. the preparation method of corundum bollow ball as claimed in claim 1, it is characterized in that: described preparation method's step is as follows:
1) with aluminium-containing substance with contain chromium material mixing in proportion, or with aluminium-containing substance, contain chromium material and additive by the ratio requirement mixing, obtain admixtion;
2) batch is dropped in three-phase or the direct current electric arc furnace, adjust electric current and voltage, until melting, refining 10～80 minutes makes Al in the melt 2700～3100 ℃ of meltings
2O
3+ Cr
2O
3The quality percentage composition is not less than 90%;
3) melting finishes, the turndown winding-up;
4) ball is sieved the chromium corundum hollow ball that obtains 0.2～5mm.
3. the preparation method of chromium corundum hollow ball as claimed in claim 2 is characterized in that: described aluminium-containing substance is one or more a arbitrary combination of commercial alumina, aluminium hydroxide, alumine or aluminium slag.
4. the preparation method of chromium corundum hollow ball as claimed in claim 2 is characterized in that: the described chromium material that contains is chrome ore or chromium oxide powder.
5. the preparation method of chromium corundum hollow ball as claimed in claim 2 is characterized in that: described additive is a carbon materials, and as the desiliconization material, consumption is SiO in the admixtion
21.2～4 times of mole number.
6. the preparation method of chromium corundum hollow ball as claimed in claim 2 is characterized in that: described additive is the mixture of carbon materials and iron content component substances, and the carbon materials consumption is SiO in the admixtion
20.8～3 times of mole number, the iron molar content is SiO in the admixtion in the iron content component substances
22～5 times of mole number.
7. as the preparation method of claim 5 or 6 described chromium corundum hollow balls, it is characterized in that: described carbon materials is graphite, refinery coke, forge one or more the arbitrary combination in back Jiao, coal, coke, pitch or the charcoal.
8. the preparation method of chromium corundum hollow ball as claimed in claim 6 is characterized in that: described iron content component substances is one or more the arbitrary combination in iron filings, iron ore, iron oxide red, iron oxide black, scrap iron or the steel scrap.
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Cited By (6)
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|---|---|---|---|---|
| CN102249716A (en) * | 2011-05-31 | 2011-11-23 | 傅晓云 | High-temperature resistant hollow spheres and preparation method thereof |
| CN102580634A (en) * | 2012-01-09 | 2012-07-18 | 北京师范大学 | Chromium hydroxide nano hollow structure with high catalytic performance |
| CN103896609A (en) * | 2014-03-08 | 2014-07-02 | 锦州集信高温材料有限公司 | Chromium corundum material and production method thereof |
| CN105060862A (en) * | 2015-08-13 | 2015-11-18 | 元亮科技有限公司 | Hollow spheres for high-temperature oxide crystal growth thermal field and preparation method of hollow sphere |
| CN105130456A (en) * | 2015-07-09 | 2015-12-09 | 长兴泓矿炉料有限公司 | Fireproof particle and preparation method thereof |
| CN105130454A (en) * | 2015-07-09 | 2015-12-09 | 长兴泓矿炉料有限公司 | High-strength bauxite-chromite refractory material and preparation method thereof |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102249716A (en) * | 2011-05-31 | 2011-11-23 | 傅晓云 | High-temperature resistant hollow spheres and preparation method thereof |
| CN102580634A (en) * | 2012-01-09 | 2012-07-18 | 北京师范大学 | Chromium hydroxide nano hollow structure with high catalytic performance |
| CN103896609A (en) * | 2014-03-08 | 2014-07-02 | 锦州集信高温材料有限公司 | Chromium corundum material and production method thereof |
| CN103896609B (en) * | 2014-03-08 | 2015-02-25 | 锦州集信高温材料有限公司 | Chromium corundum material and production method thereof |
| CN105130456A (en) * | 2015-07-09 | 2015-12-09 | 长兴泓矿炉料有限公司 | Fireproof particle and preparation method thereof |
| CN105130454A (en) * | 2015-07-09 | 2015-12-09 | 长兴泓矿炉料有限公司 | High-strength bauxite-chromite refractory material and preparation method thereof |
| CN105060862A (en) * | 2015-08-13 | 2015-11-18 | 元亮科技有限公司 | Hollow spheres for high-temperature oxide crystal growth thermal field and preparation method of hollow sphere |
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Application publication date: 20111123 |