CN104261844A - Magnesium diversion sand for ladles and preparation method thereof - Google Patents

Magnesium diversion sand for ladles and preparation method thereof Download PDF

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Publication number
CN104261844A
CN104261844A CN201410479327.1A CN201410479327A CN104261844A CN 104261844 A CN104261844 A CN 104261844A CN 201410479327 A CN201410479327 A CN 201410479327A CN 104261844 A CN104261844 A CN 104261844A
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magnesia
stuffing sand
ladle
inevitable impurity
magnesium oxide
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于景坤
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Shenyang Dongda High Temperature Material Co Ltd
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Shenyang Dongda High Temperature Material Co Ltd
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Priority to CN201410479327.1A priority Critical patent/CN104261844A/en
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/03—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on magnesium oxide, calcium oxide or oxide mixtures derived from dolomite
    • C04B35/04—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on magnesium oxide, calcium oxide or oxide mixtures derived from dolomite based on magnesium oxide

Abstract

The invention relates to a magnesium diversion sand for ladles and a preparation method thereof. The magnesium diversion sand for ladles comprises the following components in percentage by weight: 65-96% of MgO, 2-35% of SiO2 and the balance of Al2O3 and inevitable impurities. The weight percent of the inevitable impurities is at most 1.5%. The roundness is 0.96-0.99, the volume density is 3.25-3.32 g/cm<3>, and the particle diameter is 0.2-1.2mm. The preparation method comprises the following steps: (1) mixing magnesium oxide and clay, or mixing magnesium oxide, forsterite and clay to obtain a mixture; (2) grinding the mixture to 500 meshes below; (3) granulating with a disk granulator; and (4) sintering with a rotary kiln at 1350-1500 DEG C for 40-200 minutes. The diversion sand has favorable flowability, and can form a compact sintered layer with proper thickness, thereby implementing self-spruing of molten steel.

Description

A kind of ladle magnesia stuffing sand and preparation method thereof
Technical field
The invention belongs to metallurgical material technical field, particularly a kind of ladle magnesia stuffing sand and preparation method thereof.
Background technology
Stuffing sand is a kind of filler be filled in steel ladle sliding water gap; Its effect has two, and one is prevent from molten steel from entering mouth of a river condensation to block slide gate nozzle; Another one exactly when ladle open water pull slide plate time, stuffing sand will fall automatically, molten steel automatic casting.Therefore, according to mechanism when contacting with high-temperature molten steel of the effect of stuffing sand and stuffing sand and mechanism, as follows to the basic demand of stuffing sand: (1) must form one deck tight zone with the stuffing sand surface of steel contacts, immerse stuffing sand inside to prevent molten steel and form solidifying steel, (2) stuffing sand must have good mobility, to reduce the resistance that molten steel breaks through sintered layer, realize automatic casting.
At present, conventional stuffing sand mainly contains siliceous and chromium matter two kinds, mainly with silica sand and chrome ore for raw material, be prepared from addition of a certain amount of carbonaceous material simultaneously.Why siliceous and chromium matter stuffing sand is used widely, mainly based on the reason of following two aspects.One is due to its easy-sintering, forms dense sintering layer than being easier to; Two is because the crystallization of silica sand and chrome ore belongs to tetrahedron and cube structure respectively, and therefore, the particle formed when its fragmentation or weathering is close to spherical, and interparticle contact area is little, easily flows.
But along with development and the technical progress of metallurgical industry, current molten steel nearly all will be poured into a mould after external refining process again, therefore, the residence time of molten steel in ladle is very long, generally all more than 45 minutes; For some special steel grades, what have even will reach 2 ~ 3 hours.In addition, due to the needs of furnace outer refining process, the temperature of molten steel in ladle is also higher.Because siliceous and chromium matter stuffing sand ratio are easier to sintering, therefore, along with the molten steel increase of residence time and rising of liquid steel temperature in ladle, the dense sintering layer formed on stuffing sand surface thickens, the difficulty relying on molten steel self static pressure to break through dense sintering layer increases, and molten steel automatic casting ratio reduces.
Once molten steel can not automatic casting, just must adopt and burn oxygen drainage, so not only can pollute molten steel, but also the safety of the equipment of threat and operator.
In addition, due to stuffing sand fall from slide gate nozzle after to enter tundish, therefore, the SiO in stuffing sand 2and Cr 2o 3component generates inclusion by reacting with the alloying element in molten steel, has a strong impact on steel product quality.Meanwhile, because siliceous and formation component that is chromium matter stuffing sand are acidic oxide, therefore, after it enters tundish, the erosion of alkaline tundish cylinder-packing are aggravated, affect the work-ing life of tundish.
In order to adapt to the exploitation of furnace outer refining technology and special steel grade to the needs of ladle draining sand, develop some magnesia stuffing sands in recent years successively; Such as, Chinese patent CN 103145431 A discloses a kind of containing magnesium oxide stuffing sand, and it for raw material, and is prepared into MgO 45 ~ 60%, Al with aluminum-spinel and electrosmelted magnesite clinker after water mill drying 2o 335 ~ 50%, SiO 2the ladle draining sand of 1 ~ 6%; Chinese patent CN 1509827 A discloses a kind of alkaline flow guiding sand, and it mainly comes from forsterite and magnesia containing magnesia components, and particle preparation is main adopts broken mode; Chinese patent CN 1267652 A disclose a kind of for eccentric tap holes of electric furnace containing magnesium oxide stuffing sand, its mainly with the forsterite of variable grain and electrosmelted magnesite clinker for raw material, be prepared from addition of a certain amount of carbon materials simultaneously.
The above-mentioned magnesium oxide stuffing sand that contains is by adding the methods such as sintering aid, although the thickness of densified sintering product layer effectively can be controlled, but, owing to containing magnesium stuffing sand raw material, be no matter electric molten magnesite or magnesite clinker and forsterite, obtain after being all through high-temperature fusion or sintering, therefore, be crushed to as stuffing sand use granulometric range in, the particle mostly being sheet or angular of acquisition; For in the form of sheets or the magnesia raw material of angular, although can its corner angle less to a certain extent by various abrasive methods, but be difficult to reach circularity (particle projection image planes long-pending (A) and the area ratio waiting girth (P) circle, with the formula R=(4 π A/) P as required by stuffing sand 2), therefore, can not meet the requirement of stuffing sand to mobility, up to the present this be also, not yet has magnesia stuffing sand in steel ladle pouring process, have the reason of real application.Although Chinese patent CN 1267652 A disclose a kind of for eccentric tap holes of electric furnace containing magnesium oxide stuffing sand, but, because tap holes of electric furnace diameter will much larger than ladle nozzle diameter, it there is no strict demand to the mobility of stuffing sand, therefore, strict upper, its patent content and effect can not represent ladle draining sand.
In addition, due to use in the form of sheets or the magnesia raw material of angular time, can not form dense packing, therefore, in order to form densification sintering layer, the content of MgO in stuffing sand can not be too high, and will add sintering aid in stuffing sand.
Summary of the invention
For the problems referred to above that existing ladle stuffing sand exists in performance and preparation method, the invention provides a kind of ladle magnesia stuffing sand and preparation method thereof, employing magnesium oxide is raw material, circularity and particle diameter is controlled through levigate and granulation, again through sintering, make good fluidity, sinter the magnesia stuffing sand that thickness is controlled, casting rate is high.
The ladle of the present invention composition of magnesia stuffing sand contains MgO 65 ~ 96%, SiO by weight percentage 22 ~ 35%, surplus is Al 2o 3and inevitable impurity, wherein weight content≤1.5% of inevitable impurity; Ladle is by the circularity of magnesia stuffing sand 0.96 ~ 0.99, and volume density is at 3.25 ~ 3.32g/cm 3, particle diameter is at 0.2 ~ 1.2mm.
The ladle of the present invention composition of the preferred version of magnesia stuffing sand contains MgO 75 ~ 96%, SiO by weight percentage 22 ~ 20%, surplus is Al 2o 3and inevitable impurity, wherein weight content≤1.0% of inevitable impurity; Ladle is by the circularity of magnesia stuffing sand 0.97 ~ 0.99, and volume density is at 3.25 ~ 3.32g/cm 3, particle diameter is at 0.3 ~ 1.0mm.
Above-mentioned ladle by the preparation method of magnesia stuffing sand by comprising the following steps:
1, magnesium oxide is mixed with clay, or magnesium oxide, forsterite are mixed with clay, make mixture;
2, by levigate for mixture to granularity below 500 orders, make mixed powder;
3, adopt granulating disc that mixed powder is carried out granulation, make the spheroid of particle diameter at 0.2 ~ 1.2mm, circularity is 0.96 ~ 0.99;
4, sintered by spheroid rotary kiln, sintering temperature is 1350 ~ 1500 DEG C, and sintering time is 40 ~ 200min, makes the magnesia stuffing sand of ladle, controls its composition by weight percentage containing MgO 65 ~ 96%, SiO 22 ~ 35%, surplus is Al 2o 3and inevitable impurity, wherein weight content≤1.5% of inevitable impurity.
The preparation method of the preferred version of magnesia stuffing sand carries out above-mentioned ladle according to the following steps:
1, magnesium oxide is mixed with clay, or magnesium oxide, forsterite are mixed with clay, make mixture;
2, by levigate for mixture to granularity below 500 orders, make mixed powder;
3, adopt granulating disc that mixed powder is carried out granulation, make the spheroid of particle diameter at 0.3 ~ 1.0mm, circularity is 0.97 ~ 0.99;
4, sintered by spheroid rotary kiln, sintering temperature is 1450 ~ 1480 DEG C, and sintering time is 60 ~ 120min, makes the magnesia stuffing sand of ladle, controls its composition by weight percentage containing MgO 75 ~ 96%, SiO 22 ~ 20%, surplus is Al 2o 3and inevitable impurity, wherein weight content≤1.0% of inevitable impurity.
Above-mentioned magnesium oxide is one or more the mixture in light calcined magnesia, dead burned magnesia, electrically molten magnesia and high-purity magnesium oxide, purity >=75%, granularity≤50 order.
Foreign matter content≤2.5% of above-mentioned forsterite, granularity≤50 order.
The silicon oxide of above-mentioned clay and total content >=97% of aluminum oxide, granularity≤50 order.
By research and experiment results proved, the tap density of particulate matter is higher, and it more easily sinters in heat-processed, and the tap density of particle and particle shape have very large relation, and tap density that is spherical or almost spherical particle is the highest; Particle shape is more irregular, then tap density is lower; Because magnesia stuffing sand is difficult to sintering than chromium matter and siliceous stuffing sand, therefore, for magnesia stuffing sand, the dense packing realizing particle is very important for formation densification sintering layer.In addition, the densification sintering layer of formation is thinner, when ladle open water pull slide plate time, sintered layer is more easily broken through by the static pressure of molten steel, and molten steel is also higher from casting rate; And for the irregular magnesia stuffing sand of particle shape, because its tap density is lower, not easy-sintering, in order to form densification sintering layer, needs to add low melting point sintering aid; By adding the method for low melting point sintering aid, although densification sintering layer can be formed on stuffing sand surface, but, inner at stuffing sand, make mutually to bond between magnesium oxide particle due to the effect of low melting point sintering aid, reduce further the mobility of the irregular magnesia stuffing sand of particle shape, based on above achievement in research, the present invention devises the technical scheme of ladle with magnesia stuffing sand.
By drawing researching and analysing of technique scheme, due to magnesium oxide not easy-sintering, therefore, when ladle at high temperature long-time refining, stuffing sand inside also can not sinter, and can ensure that the mobility of stuffing sand is unaffected; And in order to ensure the formation of stuffing sand surface compact sintered layer, then need the tap density improving stuffing sand, and suitably adjust the chemical constitution of stuffing sand according to refining condition.
Ladle of the present invention is after having carried out test of many times with magnesia stuffing sand and achieves the result of Successful outcomes; Find in process of the test, when content of MgO be less than 65%, SiO 2when content is greater than 35%, due to SiO in stuffing sand 2more with other foreign matter contents, therefore can reduce the fusing point of stuffing sand, the sintered layer of stuffing sand inside be thickened, affects molten steel from casting rate; When mixture granularity is greater than 500 order, when utilizing granulating disc granulation, balling ratio is low, and grain roundness is little; When grain graininess is less than 0.2mm or is greater than 1.2mm, the tap density of stuffing sand is low, is unfavorable for densification sintering; When grain roundness is less than 0.96, stuffing sand mobility is deteriorated, and molten steel self-opening rate reduces; When sintering temperature is less than 1350 DEG C, stuffing sand particle is not yet fully sintered, and intensity is lower, affects the use of stuffing sand.
Gordian technique of the present invention is: in the preparation process of magnesia stuffing sand, the method for being burnt till by fine grinding, disc granulation and high temperature, and obtain grain roundness 0.96 ~ 0.99, volume density is at 3.25 ~ 3.32g/cm 3, particle diameter is at the magnesia stuffing sand of 0.2 ~ 1.2mm; There is the stuffing sand of These characteristics, not only good fluidity, and pile up closely knit, be easy to sintering; In order to control the sintered layer thickness of stuffing sand, the composition of the present invention to magnesia stuffing sand improves, and in above-mentioned preparation method and chemical composition range, stuffing sand not only has good mobility, and the dense sintering layer of suitable depth can be formed, and then realize molten steel from opening and water.
Embodiment
The magnesium oxide adopted in the embodiment of the present invention, forsterite and clay are commercial products.
The equipment of levigate employing in the embodiment of the present invention is LXM820 type centrifugal superfine pulverizing mill.
The granulating disc adopted in the embodiment of the present invention is ceramsite sand nodulizer.
The equipment testing circularity in the embodiment of the present invention is 500Nano full-automatic granularity particle shape analyser.
In the embodiment of the present invention, the method for test volume density is SM-1000 type haydite volume density tester.
The tap density when ladle prepared in the embodiment of the present invention uses with magnesia stuffing sand is at 900 ~ 1000kg/m 3, molten steel is 100% from casting rate.
The magnesium oxide adopted in the embodiment of the present invention is one or more the mixture in light calcined magnesia, dead burned magnesia, electrically molten magnesia or high-purity magnesium oxide, purity >=75%, granularity≤50 order; Foreign matter content≤2.5% of the forsterite adopted, granularity≤50 order; The silicon oxide of clay adopted and total content >=97% of aluminum oxide, granularity≤50 order.
Embodiment 1
Magnesium oxide and clay are mixed and made into mixture;
By levigate for mixture to granularity below 500 orders, make mixed powder;
Adopt granulating disc that mixed powder is carried out granulation, make the spheroid of particle diameter at 0.2 ~ 1.2mm, circularity is 0.96 ~ 0.99;
By spheroid with rotary kiln sintered, sintering temperature is 1500 DEG C, and sintering time is 40min, makes the magnesia stuffing sand of ladle, and its composition is by weight percentage containing MgO 96%, SiO 22%, surplus is Al 2o 3and inevitable impurity, wherein weight content≤1.5% of inevitable impurity, volume density 3.25g/cm 3.
Embodiment 2
Magnesium oxide and clay are mixed and made into mixture;
By levigate for mixture to granularity below 500 orders, make mixed powder;
Adopt granulating disc that mixed powder is carried out granulation, make the spheroid of particle diameter at 0.2 ~ 1.2mm, circularity is 0.96 ~ 0.99;
By spheroid with rotary kiln sintered, sintering temperature is 1450 DEG C, and sintering time is 160min, makes the magnesia stuffing sand of ladle, and its composition is by weight percentage containing MgO90%, SiO 27%, surplus is Al 2o 3and inevitable impurity, wherein weight content≤1.5% of inevitable impurity, volume density 3.32g/cm 3.
Embodiment 3
Magnesium oxide and clay are mixed and made into mixture;
By levigate for mixture to granularity below 500 orders, make mixed powder;
Adopt granulating disc that mixed powder is carried out granulation, make the spheroid of particle diameter at 0.2 ~ 1.2mm, circularity is 0.96 ~ 0.99;
By spheroid with rotary kiln sintered, sintering temperature is 1400 DEG C, and sintering time is 100min, makes the magnesia stuffing sand of ladle, and its composition is by weight percentage containing MgO 88%, SiO 28%, surplus is Al 2o 3and inevitable impurity, wherein weight content≤1.5% of inevitable impurity, volume density 3.28g/cm 3.
Embodiment 4
Magnesium oxide, forsterite and clay are mixed and made into mixture;
By levigate for mixture to granularity below 500 orders, make mixed powder;
Adopt granulating disc that mixed powder is carried out granulation, make the spheroid of particle diameter at 0.2 ~ 1.2mm, circularity is 0.96 ~ 0.99;
By spheroid with rotary kiln sintered, sintering temperature is 1350 DEG C, and sintering time is 40min, makes the magnesia stuffing sand of ladle, and its composition is by weight percentage containing MgO80%, SiO 215%, surplus is Al 2o 3and inevitable impurity, wherein weight content≤1.5% of inevitable impurity, volume density 3.29g/cm 3.
Embodiment 5
Magnesium oxide, forsterite and clay are mixed and made into mixture;
By levigate for mixture to granularity below 500 orders, make mixed powder;
Adopt granulating disc that mixed powder is carried out granulation, make the spheroid of particle diameter at 0.2 ~ 1.2mm, circularity is 0.96 ~ 0.99;
By spheroid with rotary kiln sintered, sintering temperature is 1500 DEG C, and sintering time is 60min, makes the magnesia stuffing sand of ladle, and its composition controlling mixture is by weight percentage containing MgO74%, SiO 220%, surplus is Al 2o 3and inevitable impurity, wherein weight content≤1.5% of inevitable impurity, volume density 3.30g/cm 3.
Embodiment 6
Magnesium oxide, forsterite and clay are mixed and made into mixture;
By levigate for mixture to granularity below 500 orders, make mixed powder;
Adopt granulating disc that mixed powder is carried out granulation, make the spheroid of particle diameter at 0.2 ~ 1.2mm, circularity is 0.96 ~ 0.99;
By spheroid with rotary kiln sintered, sintering temperature is 1350 DEG C, and sintering time is 180min, makes the magnesia stuffing sand of ladle, and its composition is by weight percentage containing MgO 65%, SiO 235%, surplus is Al 2o 3and inevitable impurity, wherein weight content≤1.5% of inevitable impurity, volume density 3.31g/cm 3.
Embodiment 7
Magnesium oxide and clay are mixed and made into mixture;
By levigate for mixture to granularity below 500 orders, make mixed powder;
Adopt granulating disc that mixed powder is carried out granulation, make the spheroid of particle diameter at 0.3 ~ 1.0mm, circularity is 0.97 ~ 0.99;
By spheroid with rotary kiln sintered, sintering temperature is 1450 DEG C, and sintering time is 120min, makes the magnesia stuffing sand of ladle, and its composition is by weight percentage containing MgO 96%, SiO 22%, surplus is Al 2o 3and inevitable impurity, wherein weight content≤1.0% of inevitable impurity, volume density 3.28g/cm 3.
Embodiment 8
Magnesium oxide and clay are mixed and made into mixture;
By levigate for mixture to granularity below 500 orders, make mixed powder;
Adopt granulating disc that mixed powder is carried out granulation, make the spheroid of particle diameter at 0.3 ~ 1.0mm, circularity is 0.97 ~ 0.99;
By spheroid with rotary kiln sintered, sintering temperature is 1460 DEG C, and sintering time is 100min, makes the magnesia stuffing sand of ladle, and its composition is by weight percentage containing MgO90%, SiO 25%, surplus is Al 2o 3and inevitable impurity, wherein weight content≤1.0% of inevitable impurity, volume density 3.32g/cm 3.
Embodiment 9
Magnesium oxide and clay are mixed and made into mixture;
By levigate for mixture to granularity below 500 orders, make mixed powder;
Adopt granulating disc that mixed powder is carried out granulation, make the spheroid of particle diameter at 0.3 ~ 1.0mm, circularity is 0.97 ~ 0.99;
By spheroid with rotary kiln sintered, sintering temperature is 1470 DEG C, and sintering time is 80min, makes the magnesia stuffing sand of ladle, and its composition is by weight percentage containing MgO 80%, SiO 28%, surplus is Al 2o 3and inevitable impurity, wherein weight content≤1.0% of inevitable impurity, volume density 3.29g/cm 3.
Embodiment 10
Magnesium oxide, forsterite and clay are mixed and made into mixture;
By levigate for mixture to granularity below 500 orders, make mixed powder;
Adopt granulating disc that mixed powder is carried out granulation, make the spheroid of particle diameter at 0.3 ~ 1.0mm, circularity is 0.97 ~ 0.99;
By spheroid with rotary kiln sintered, sintering temperature is 1480 DEG C, and sintering time is 60min, makes the magnesia stuffing sand of ladle, and its composition is by weight percentage containing MgO 79%, SiO 210%, surplus is Al 2o 3and inevitable impurity, wherein weight content≤1.0% of inevitable impurity, volume density 3.27g/cm 3.
Embodiment 11
Magnesium oxide, forsterite and clay are mixed and made into mixture;
By levigate for mixture to granularity below 500 orders, make mixed powder;
Adopt granulating disc that mixed powder is carried out granulation, make the spheroid of particle diameter at 0.3 ~ 1.0mm, circularity is 0.97 ~ 0.99;
By spheroid with rotary kiln sintered, sintering temperature is 1450 DEG C, and sintering time is 120min, makes the magnesia stuffing sand of ladle, and its composition is by weight percentage containing MgO 78%, SiO 215%, surplus is Al 2o 3and inevitable impurity, wherein weight content≤1.0% of inevitable impurity, volume density 3.30g/cm 3.
Embodiment 12
Magnesium oxide, forsterite and clay are mixed and made into mixture;
By levigate for mixture to granularity below 500 orders, make mixed powder;
Adopt granulating disc that mixed powder is carried out granulation, make the spheroid of particle diameter at 0.3 ~ 1.0mm, circularity is 0.97 ~ 0.99;
By spheroid with rotary kiln sintered, sintering temperature is 1480 DEG C, and sintering time is 60min, makes the magnesia stuffing sand of ladle, and its composition is by weight percentage containing MgO 75%, SiO 220%, surplus is Al 2o 3and inevitable impurity, wherein weight content≤1.0% of inevitable impurity, volume density 3.26g/cm 3.

Claims (7)

1. the magnesia stuffing sand of ladle, is characterized in that composition by weight percentage containing MgO 65 ~ 96%, SiO 22 ~ 35%, surplus is Al 2o 3and inevitable impurity, wherein weight content≤1.5% of inevitable impurity; Ladle is by the circularity of magnesia stuffing sand 0.96 ~ 0.99, and volume density is at 3.25 ~ 3.32g/cm 3, particle diameter is at 0.2 ~ 1.2mm.
2. the magnesia stuffing sand of ladle, is characterized in that composition by weight percentage containing MgO 75 ~ 96%, SiO 22 ~ 20%, surplus is Al 2o 3and inevitable impurity, wherein weight content≤1.0% of inevitable impurity; Ladle is by the circularity of magnesia stuffing sand 0.97 ~ 0.99, and volume density is at 3.25 ~ 3.32g/cm 3, particle diameter is at 0.3 ~ 1.0mm.
3. a ladle according to claim 1 preparation method for magnesia stuffing sand, is characterized in that carrying out according to the following steps:
(1) magnesium oxide is mixed with clay, or magnesium oxide, forsterite are mixed with clay, make mixture;
(2) by levigate for mixture to granularity below 500 orders, make mixed powder;
(3) adopt granulating disc that mixed powder is carried out granulation, make the spheroid of particle diameter at 0.2 ~ 1.2mm, circularity is 0.96 ~ 0.99;
(4) sintered by spheroid rotary kiln, sintering temperature is 1350 ~ 1500 DEG C, and sintering time is 40 ~ 200min, makes the magnesia stuffing sand of ladle, controls its composition by weight percentage containing MgO 65 ~ 96%, SiO 22 ~ 35%, surplus is Al 2o 3and inevitable impurity, wherein weight content≤1.5% of inevitable impurity.
4. a ladle according to claim 2 preparation method for magnesia stuffing sand, is characterized in that carrying out according to the following steps:
(1) magnesium oxide is mixed with clay, or magnesium oxide, forsterite are mixed with clay, make mixture;
(2) by levigate for mixture to granularity below 500 orders, make mixed powder;
(3) adopt granulating disc that mixed powder is carried out granulation, make the spheroid of particle diameter at 0.3 ~ 1.0mm, circularity is 0.97 ~ 0.99;
(4) sintered by spheroid rotary kiln, sintering temperature is 1450 ~ 1480 DEG C, and sintering time is 60 ~ 120min, makes the magnesia stuffing sand of ladle, controls its composition by weight percentage containing MgO 75 ~ 96%, SiO 22 ~ 20%, surplus is Al 2o 3and inevitable impurity, wherein weight content≤1.0% of inevitable impurity.
5. the preparation method of magnesia stuffing sand of the ladle according to claim 3 or 4, it is characterized in that described magnesium oxide is one or more the mixture in light calcined magnesia, dead burned magnesia, electrically molten magnesia or high-purity magnesium oxide, magnesian weight content >=75%, granularity≤50 order.
6. the preparation method of magnesia stuffing sand of the ladle according to claim 3 or 4, is characterized in that foreign matter content≤2.5% of described forsterite, granularity≤50 order.
7. the preparation method of magnesia stuffing sand of the ladle according to claim 3 or 4, is characterized in that the silicon oxide of described clay and total content >=97% of aluminum oxide, granularity≤50 order.
CN201410479327.1A 2014-09-19 2014-09-19 Magnesium diversion sand for ladles and preparation method thereof Pending CN104261844A (en)

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CN107382334A (en) * 2017-06-28 2017-11-24 常州禾吉纺织品有限公司 A kind of ladle magnesium zirconium draining ageng and preparation method thereof
CN108101560A (en) * 2017-12-29 2018-06-01 河南通宇冶材集团有限公司 A kind of preparation method of particle drainage agent
CN112250435A (en) * 2020-10-22 2021-01-22 彰武县联信铸造硅砂有限公司 Forsterite spherical sand and preparation method and application thereof
CN114315321A (en) * 2021-12-22 2022-04-12 河南通宇冶材集团有限公司 Special drainage agent for cord steel and preparation method thereof
CN116041078A (en) * 2023-02-08 2023-05-02 鞍山市和丰耐火材料有限公司 Ladle drainage agent with high automatic casting rate and preparation method thereof

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CN107382334A (en) * 2017-06-28 2017-11-24 常州禾吉纺织品有限公司 A kind of ladle magnesium zirconium draining ageng and preparation method thereof
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CN114315321A (en) * 2021-12-22 2022-04-12 河南通宇冶材集团有限公司 Special drainage agent for cord steel and preparation method thereof
CN116041078A (en) * 2023-02-08 2023-05-02 鞍山市和丰耐火材料有限公司 Ladle drainage agent with high automatic casting rate and preparation method thereof
CN116041078B (en) * 2023-02-08 2024-02-13 鞍山市和丰耐火材料有限公司 Ladle drainage agent with high automatic casting rate and preparation method thereof

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Application publication date: 20150107