CN102180689A - Magnalium hollow ball and preparation method thereof - Google Patents
Magnalium hollow ball and preparation method thereof Download PDFInfo
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- CN102180689A CN102180689A CN 201110058086 CN201110058086A CN102180689A CN 102180689 A CN102180689 A CN 102180689A CN 201110058086 CN201110058086 CN 201110058086 CN 201110058086 A CN201110058086 A CN 201110058086A CN 102180689 A CN102180689 A CN 102180689A
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Abstract
The invention discloses a magnalium hollow ball and a preparation method thereof. In the magnalium hollow ball, the mass percentage content of Al2O3 is 0.1-99.5%, and the mass percentage content of MgO is 0.5-99.9%. The preparation method comprises the following steps: based on commercial alumina, aluminium hydroxide, light roasting magnesium oxide powder, magnesia, magnesite and the like as main raw materials, introducing an additive so as to regulate components and viscosity of a melt; smelting in a three-phase alternative current arc ore thermal furnace or a direct current arc ore thermal furnace; jetting with air; and screening so as to obtain the magnalium hollow ball with a diameter of 0.2-5mm. The prepared magnalium hollow ball has the advantages of large compression strength, good thermal insulation property, high use temperature and stable chemical property, and is especially suitable for preparing aggregate in a basic thermal insulation material and a pouring material.
Description
Technical field
The present invention relates to hollow ball in the refractory materials and preparation method thereof, relate in particular to a kind of magnalium 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, overcome 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, but introduce serious, the compressive strength reduction of the raising of heavily burning linear shrinkage ratio, refractoriness under load reduction, high temperature creep that a large amount of pores can cause light material again, thereby the use temperature that makes lagging material is difficult to improve, range of application is restricted, and 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.The crystal formation of alumina hollow ball is α-Al
2O
3Microcrystal, when adopting magnesia basic material such as grade as matrix, the hollow ball surface reacts easily, causes the breakage of hollow ball and product strength to reduce, and the application of alumina hollow ball in alkaline lagging material and insulated pouring material is restricted.And adopting the magnalium hollow ball just in time can remedy the alumina hollow ball deficiency of performance in this regard, existing at present employing pore former burning is lost legal system and is equipped with the report of magnalium hollow ball, but the magnalium hollow ball particle surface that makes is coarse, and compressive strength is low.
Summary of the invention
The object of the present invention is to provide a kind of magnalium hollow ball and preparation method thereof, the know-why of institute's foundation is on the basis of original preparation alumina hollow ball, with commercial alumina or aluminium hydroxide and light-magnesite powder or magnesite or magnesia etc. is main raw material, introduce additive simultaneously and adjust melt composition and viscosity, make and in fusion process, generate magnesium-aluminium spinel, make the magnalium hollow ball by winding-up magnesium-aluminium spinel melt.
Concrete technical scheme of the present invention is as follows:
One, a kind of magnalium hollow ball:
Al in the magnalium hollow ball
2O
3The quality percentage composition is 0.1 ~ 99.5%, and MgO quality percentage composition is 0.5～99.9%.
Two, a kind of preparation method of magnalium hollow ball, the step of this method is as follows:
1) will contain magnesium raw material and aluminum-containing raw material and additive by ratio requirement ball mill or stirrer for mixing 1 ~ 2 hour;
2) admixtion is dropped in three-phase or the direct current electric arc furnace, adjusts electric current and voltage, 2100 ~ 2800 ℃ of meltings until fusion, refining 10 ~ 40 minutes;
3) melting finishes, the turndown winding-up;
4) ball is sieved the magnalium hollow ball that obtains 0.2 ~ 5mm.
Described aluminum-containing raw material is one or both in commercial alumina or the aluminium hydroxide.
The described magnesium raw material that contains is a one or more combination in light-magnesite powder, magnesia or the magnesite.
Described additive is a carbon materials, and as the desiliconization material, consumption is aluminum-containing raw material and contains SiO in the magnesium raw material
21.2～4 times of mole number.
When described additive was the mixture of carbon materials and iron filings, the carbon materials consumption was aluminum-containing raw material and contains SiO in the magnesium raw material
20.8 ~ 3 times of mole number, iron filings consumption are aluminum-containing raw material and contain SiO in the magnesium raw material
22～5 times of mole number.
Described carbon materials comprises one or both in graphite or the refinery coke.
The beneficial effect that the present invention has is:
The magnalium hollow ball compressive strength of the present invention's preparation is big, and thermal and insulating performance is good, the use temperature height, and stable chemical performance is particularly suitable for preparing the aggregate in alkaline lagging material and the mould material, and thermal and insulating performance is good.
Embodiment
Embodiment 1:
Proportioning raw materials adopts light-magnesite powder 28%, magnesia 72%(all to contain aluminium in a small amount for above two kinds), SiO in the composition of raw materials
2Content calculates by 2%, adopts 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 until fusion, refining 10 minutes; Melting finishes, the turndown winding-up; The ball screening is obtained the magnalium hollow ball of 0.2 ~ 5mm.
Embodiment 2:
Proportioning raw materials adopts aluminium hydroxide 11%, magnesite 89%, SiO in the composition of raw materials
2Content calculates by 1.8%, adopts refinery coke and iron filings as additive, and the consumption of refinery coke guarantees that the C molar weight is SiO in the batching in the refinery coke
23 times of molar weight, the consumption of iron filings guarantee that the Fe molar weight is SiO in the batching in the iron filings
22 times of molar weight; The raw material back of working good was mixed in ball mill 2 hours; Admixtion is dropped in the direct current electric arc furnace, adjust electric current and voltage 2600 ℃ of meltings, refining 20 minutes; Melting finishes, the turndown winding-up; The ball screening is obtained the magnalium hollow ball of 0.2 ~ 5mm.
Embodiment 3:
Proportioning raw materials adopts commercial alumina 30%, magnesia 70%, SiO in the composition of raw materials
2Content calculates by 1.6%, adopts refinery coke and graphite as additive, and the consumption of refinery coke and graphite guarantees that the C molar weight of adding is SiO in the batching
21.2 times of molar weight; The raw material back of working good was mixed in ball mill 2 hours; Admixtion is dropped in the three-phawse arc furnace, adjust electric current and 2500 ℃ of meltings of voltage until fusion, refining 30 minutes; Melting finishes, the turndown winding-up; The ball screening is obtained the magnalium hollow ball of 0.2 ~ 5mm.
Embodiment 4:
Proportioning raw materials adopts commercial alumina 42%, magnesite 28%, magnesia 30%, SiO in the composition of raw materials
2Content calculates by 1.4%, adopts graphite and iron filings as additive, and the consumption of graphite 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 1.5 hours; Admixtion is dropped in the three-phawse arc furnace, adjust electric current and voltage 2500 ℃ of meltings until fusion, refining 40 minutes; Melting finishes, the turndown winding-up; The ball screening is obtained the magnalium hollow ball of 0.2 ~ 5mm.
Embodiment 5:
Proportioning raw materials adopts aluminium hydroxide 63%, magnesia 37%, SiO in the composition of raw materials
2Content calculates by 1.2%, adopts graphite as additive, and the consumption of graphite guarantees that the C molar weight is SiO in the batching
21.8 times of molar weight; The raw material back of working good was mixed in ball mill 1.2 hours; Admixtion is dropped in the direct current electric arc furnace, adjust electric current and voltage 2400 ℃ of meltings until fusion, refining 25 minutes; Melting finishes, the turndown winding-up; The ball screening is obtained the magnalium hollow ball of 0.2 ~ 5mm.
Embodiment 6:
Proportioning raw materials adopts aluminium hydroxide 73%, light-magnesite powder 27%, SiO in the composition of raw materials
2Content calculates by 1.0%, adopts graphite and iron filings as additive, and the consumption of graphite guarantees that the C molar weight is SiO in the batching
21 times of molar weight, the consumption of iron filings guarantee that the Fe molar weight is SiO in the batching
23 times of molar weight; The raw material back of working good was mixed in ball mill 1.2 hours; Admixtion is dropped in the three-phawse arc furnace, adjust electric current and voltage 2300 ℃ of meltings until fusion, refining 20 minutes; Melting finishes, the turndown winding-up; The ball screening is obtained the magnalium hollow ball of 0.2 ~ 5mm.
Embodiment 7:
Proportioning raw materials adopts commercial alumina 69%, magnesite 15%, magnesia 16%, SiO in the composition of raw materials
2Content calculates by 0.8%, adopts refinery coke and iron filings as additive, and the consumption of refinery coke guarantees that the C molar weight is SiO in the batching
22 times of molar weight, the consumption of iron filings guarantee that the Fe molar weight is SiO in the batching
24 times of molar weight; The raw material back of working good was mixed in ball mill 1.6 hours; Admixtion is dropped in the three-phawse arc furnace, adjust electric current and voltage 2300 ℃ of meltings to fusion, refining 30 minutes; Melting finishes, the turndown winding-up; The ball screening is obtained the magnalium hollow ball of 0.2 ~ 5mm.
Embodiment 8:
Proportioning raw materials adopts commercial alumina 59%, aluminium hydroxide 18%, magnesia 23%, SiO in the composition of raw materials
2Content calculates by 0.6%, adopts refinery coke and iron filings as additive, and the consumption of refinery coke 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
22.5 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 2300 ℃ of meltings to fusion, refining 35 minutes; Melting finishes, the turndown winding-up; The ball screening is obtained the magnalium hollow ball of 0.2 ~ 5mm.
Embodiment 9:
Proportioning raw materials adopts commercial alumina 81%, magnesite 11%, light-magnesite powder 8%, SiO in the composition of raw materials
2Content calculates by 0.5%, adopts graphite and iron filings as additive, and the consumption of graphite 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
22 times of molar weight; The raw material back of working good was mixed in ball mill 1 hour; Admixtion is dropped in the direct current electric arc furnace, adjust electric current and voltage 2300 ℃ of meltings to fusion, refining 38 minutes; Melting finishes, the turndown winding-up; The ball screening is obtained the magnalium hollow ball of 0.2 ~ 5mm.
Embodiment 10:
Proportioning raw materials adopts commercial alumina 98%, magnesite 2%, SiO in the composition of raw materials
2Content calculates by 0.4%, adopts refinery coke, graphite and iron filings as additive, and the consumption of refinery coke and graphite 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
22 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 2300 ℃ of meltings to fusion, refining 15 minutes; Melting finishes, the turndown winding-up; The ball screening is obtained the magnalium hollow ball of 0.2 ~ 5mm.
Claims (7)
1. a magnalium hollow ball is characterized in that: Al in the magnalium hollow ball
2O
3The quality percentage composition is 0.1 ~ 99.5%, and MgO quality percentage composition is 0.5～99.9%.
2. the preparation method who is used for the described a kind of magnalium hollow ball of claim 1 is characterized in that the step of this method is as follows:
1) will contain magnesium raw material and aluminum-containing raw material and additive by ratio requirement ball mill or stirrer for mixing 1 ~ 2 hour;
2) admixtion is dropped in three-phase or the direct current electric arc furnace, adjusts electric current and voltage, 2100 ~ 2800 ℃ of meltings until fusion, refining 10 ~ 40 minutes;
3) melting finishes, the turndown winding-up;
4) ball is sieved the magnalium hollow ball that obtains 0.2 ~ 5mm.
3. the preparation method of a kind of magnalium hollow ball according to claim 2 is characterized in that: described aluminum-containing raw material is one or both in commercial alumina or the aluminium hydroxide.
4. the preparation method of a kind of magnalium hollow ball according to claim 2 is characterized in that: the described magnesium raw material that contains is a one or more combination in light-magnesite powder, magnesia or the magnesite.
5. the preparation method of a kind of magnalium hollow ball according to claim 2 is characterized in that: described additive is a carbon materials, and as the desiliconization material, consumption is aluminum-containing raw material and contains SiO in the magnesium raw material
21.2～4 times of mole number.
6. the preparation method of a kind of magnalium hollow ball according to claim 2 is characterized in that: when described additive was the mixture of carbon materials and iron filings, the carbon materials consumption was aluminum-containing raw material and contains SiO in the magnesium raw material
20.8 ~ 3 times of mole number, iron filings consumption are aluminum-containing raw material and contain SiO in the magnesium raw material
22～5 times of mole number.
7. according to the preparation method of claim 5 or 6 described a kind of magnalium hollow balls, it is characterized in that: described carbon materials comprises one or both in graphite or the refinery coke.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110058086 CN102180689A (en) | 2011-03-11 | 2011-03-11 | Magnalium hollow ball and preparation method thereof |
| PCT/CN2011/075096 WO2012122745A1 (en) | 2011-03-11 | 2011-06-01 | High temperature resistant hollow sphere and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110058086 CN102180689A (en) | 2011-03-11 | 2011-03-11 | Magnalium hollow ball and preparation method thereof |
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| CN102180689A true CN102180689A (en) | 2011-09-14 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102584292A (en) * | 2012-02-22 | 2012-07-18 | 北京首钢耐材炉料有限公司 | Low-carbon steel ladle wall brick and production method thereof |
| CN107840653A (en) * | 2017-11-29 | 2018-03-27 | 阳泉中创陶粒有限公司 | A kind of preparation method of aluminum-spinel remelting ball shape casting sand |
| CN108395262A (en) * | 2018-04-16 | 2018-08-14 | 河南工业大学 | A kind of olivine combination magnesium aluminate spinel hollow ball castable and preparation method |
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| CN101857449A (en) * | 2010-06-07 | 2010-10-13 | 长兴盛旺锅炉耐火保温防腐工程有限公司 | Siliceous mullite structure-insulating integrated composite brick and preparation method thereof |
| CN101863672A (en) * | 2010-06-01 | 2010-10-20 | 浙江大学 | Preparation method of alumina corundum hollow sphere |
| CN101863675A (en) * | 2010-06-07 | 2010-10-20 | 浙江大学 | High-alumina structure heat-insulation integrated composite brick and preparation method |
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2011
- 2011-03-11 CN CN 201110058086 patent/CN102180689A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101863672A (en) * | 2010-06-01 | 2010-10-20 | 浙江大学 | Preparation method of alumina corundum hollow sphere |
| CN101857449A (en) * | 2010-06-07 | 2010-10-13 | 长兴盛旺锅炉耐火保温防腐工程有限公司 | Siliceous mullite structure-insulating integrated composite brick and preparation method thereof |
| CN101863675A (en) * | 2010-06-07 | 2010-10-20 | 浙江大学 | High-alumina structure heat-insulation integrated composite brick and preparation method |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102584292A (en) * | 2012-02-22 | 2012-07-18 | 北京首钢耐材炉料有限公司 | Low-carbon steel ladle wall brick and production method thereof |
| CN107840653A (en) * | 2017-11-29 | 2018-03-27 | 阳泉中创陶粒有限公司 | A kind of preparation method of aluminum-spinel remelting ball shape casting sand |
| CN108395262A (en) * | 2018-04-16 | 2018-08-14 | 河南工业大学 | A kind of olivine combination magnesium aluminate spinel hollow ball castable and preparation method |
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Application publication date: 20110914 |