CN100567204C - Magnesium iron spinel sand and manufacture method thereof - Google Patents

Magnesium iron spinel sand and manufacture method thereof Download PDF

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Publication number
CN100567204C
CN100567204C CNB2007100108069A CN200710010806A CN100567204C CN 100567204 C CN100567204 C CN 100567204C CN B2007100108069 A CNB2007100108069 A CN B2007100108069A CN 200710010806 A CN200710010806 A CN 200710010806A CN 100567204 C CN100567204 C CN 100567204C
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oxide
ferric oxide
magnesium
magnesium oxide
manufacture
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CN101045624A (en
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张永
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YINGKOU GAOKE SYNTHETIC REFRACTORY CO Ltd
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YINGKOU GAOKE SYNTHETIC REFRACTORY CO Ltd
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Abstract

The present invention relates to magnesium iron spinel sand and manufacture method thereof.The technical scheme that adopts is: by the weight part proportioning is that the raw material of 85~98 parts in magnesium oxide, 2~15 parts of ferric oxide is made; Manufacture method is as follows: (1) wears into fine powder with ferric oxide; (2) magnesium oxide, ferric oxide are prepared burden by weight ratio, wherein, after magnesium oxide and ferric oxide mix, also can add 5%~15% wedding agent water of its gross weight, mix; With the material that mixes, after the baler densification, enter the ball press balling-up; Under natural temperature, drying and dehydrating, dewatering time are 2~4 days after the material balling-up; (3) will mix or dried material is put into three-phawse arc furnace, be 2800~3200 ℃ in temperature, fusion 9~11 hours; (4) will burn till product under natural temperature, cool off the broken product of cutting or polish jade with an emery wheel out 6-7 days.The present invention has eliminated environmental pollution, chromium public hazards, has improved the work-ing life of cement rotary kiln clinkering zone usefulness brick.

Description

Magnesium iron spinel sand and manufacture method thereof
Technical field:
The present invention relates to a kind of refractory materials and manufacture method thereof, in particular for refractory materials magnesium iron spinel sand and the manufacture method thereof of clinkering zone in the cement kiln rotary kiln with brick.
Background technology:
At present, the cement kiln clinkering zone adopts magnesia chrome brick mostly with brick in the world, though this refractory materials result of use is good, seriously polluted, though the chromium composition in the chrome brick is with Cr in the brickmaking process 3+Form exists, but in the cement kiln use with the kiln material in alkali (Na 2O and K 2O) combine, form the hexavalent chromium compound of severe toxicity, these hexavalent chromium compounds all are the water-soluble substanceses of severe toxicity, and are a part of along with exhaust gas and dust escapes, polluted air, and some residues in the useless brick of dismounting, residues in the Cr in the useless brick 6+Permeate the ground through the dissolving of rainwater and to cause environmental pollution.
Summary of the invention:
Provide a kind of decontamination, chromium public hazards order of the present invention, improve the magnesium iron spinel sand of cement rotary kiln clinkering zone with the brick life-span.
Another object of the present invention provides a kind of method of making magnesium iron spinel sand.
The present invention realizes by following proposal:
A kind of magnesium iron spinel sand is characterized in that it being to be made by weight ratio by magnesium oxide and ferric oxide, and magnesium oxide and ferric oxide are 100 parts of meters by weight, and the weight part proportioning of magnesium oxide and ferric oxide is 85~98 parts in magnesium oxide, 2~15 parts of ferric oxide.
The manufacture method of described magnesium iron spinel sand is characterized in that its step is as follows:
(1) ferric oxide is worn into fine powder;
(2) magnesium oxide, ferric oxide are prepared burden by weight ratio;
(3) mixture being put into three-phawse arc furnace, is 2800~3200 ℃ in temperature, fusion 9~11 hours;
(4) will burn till product under natural temperature, cool off the broken product of cutting or polish jade with an emery wheel out 6-7 days.
The manufacture method of described magnesium iron spinel sand, it is characterized in that its step also comprises, after step (2) is prepared burden magnesium oxide, ferric oxide by weight ratio, compound is dropped in the mixer, add 5%~15% wedding agent water of magnesium oxide and ferric oxide gross weight, mix; With the material that mixes, after the baler densification, enter the ball press balling-up; Under natural temperature, drying and dehydrating, dewatering time are 2~4 days after the material balling-up; Dried material is carried out step (3) and step (4) again.
Product behind the broken stone roller can carry out fragmentation according to service requirements, sieves into varigrained product.
The contriver has done simultaneous test to selecting for use of raw material, presses aforementioned production method, with ferric oxide and superfine wagnerite by 94: 6 proportionings, the magnesium iron spinel sand of making through high-temperature fusion, naturally cooling, its Chemical Composition is MgO 93.2%, Al 2O 30.5%, Fe 2O 33.8%, CaO1.7%, SiO 0.8%, the iron-holder instability yields poorly, and the power consumption height is by its brick apparent porosity 16~18% of making, volume density 2.85~3.00g/cm, normal pressure intensity 50Mpa;
By test, preferred magnesium oxide is light calcined magnesia, and technical indicator is MgO 〉=90%, SiO 2≤ 0.6%, CaO≤1.2%, bright alkali<5%; The technical indicator of ferric oxide is Fe 2O 3〉=97%, SiO 2≤ 1.2%; Ferric oxide can be brown iron oxide or red iron oxide.
With ferric oxide directly and light-burning magnesium powder press MgO: Fe 2O 3=93: 7 ratio proportionings after the baler densification, enter the ball press balling-up, through 3000 ℃ of fusions, make magnesium iron spinel sand, outward appearance crystal gloss, and it is close that body is dense, but skin sand is too much, and its Chemical Composition is MgO 90.11%, Al 2O 30.6%, Fe 2O 37.1%, CaO 1.49%, SiO 0.7%, the power consumption height, grade is inhomogeneous, is applied to cement kiln clinkering zone brick, its brick apparent porosity 21~23% of making, volume density 2.70~2.80g/cm, normal pressure intensity 45Mpa after making brick.Because ferric oxide is not worn into fine powder, in melting process, the skewness of ferric oxide in magnesium oxide, the magnesium iron spinel sand of making, its thermostability and resistance to fouling and chromium sand are approaching.But too late chromium sand aspect the firm kliner coating of extension.Therefore, in manufacturing process, earlier ferric oxide is processed into fine powder, preferably ferric oxide is worn into 300~400 purpose fine powders, magnesium oxide is worn into the particle less than 0.6mm.
The invention has the beneficial effects as follows: because in the raw iron oxide material of magnesium oxide of selecting for use and iron-holder 〉=97%, do not contain chromium composition and trace chromium, thereby can not pollute environment, and the cost of magnesium oxide and ferric oxide is more much lower than chromium, so production cost is low.The ferric oxide material is made fine powder, after the baler densification,,, help ferric oxide uniform distribution in magnesium oxide so then, thereby form by magnesium oxide and ferric oxide eutectic combination product, i.e. magnesium iron spinel sand then in high-temperature fusion through the ball press balling-up.Magnesium iron spinel sand of the present invention, its principal feature hang down silicon, low calcium, and foreign matter content is few, and magnesium iron resultant can reach 98% at most.Magnesium iron spinel sand is mainly used in produces the pleonast(e) brick; the brick of making is applied to cement kiln clinkering zone brick; because cement clinker has good avidity to the iron in the brick, therefore has the firm kliner coating of extension, protection refractory brick body; alleviate and be subjected to thermal stresses; the destruction of chemical corrosion mechanical stress has prolonged work-ing life, uses the 30-40 of manying sky than chrome brick; reduce refractory consumption rate, solved chromic pollution simultaneously again.
Embodiment
Embodiment 1
Raw material: magnesium oxide: MgO 92.79%, SiO 20.56%, CaO 1.15%, bright alkali 4.5%, Fe 2O 30.8%, Al 2O 30.2%;
Ferric oxide: Fe 2O 397.5%, SiO 21.1%.
A kind of magnesium iron spinel sand, its manufacture method is as follows:
(1) ferric oxide is worn into less than 500 order fine powders;
(2) get magnesium oxide, ferric oxide, its weight part proportioning is 95: 5, mixes;
(3) mixed material being put into three-phawse arc furnace, is 3000 ℃ in temperature, fusion 10 hours;
(4) will burn till product under 25 ℃ of natural temperatures, cool off the broken product of cutting or polish jade with an emery wheel out 6 days;
The results are shown in Table 1
Embodiment 2
Raw material: magnesium oxide: MgO 92.4%, SiO 20.6%, CaO 1.2%, bright alkali 5%, Fe 2O 30.6%, Al 2O 30.2%;
Ferric oxide: Fe 2O 397%, SiO 21.2%.
A kind of magnesium iron spinel sand, its manufacture method is as follows:
(1) ferric oxide is worn into less than 500 order fine powders;
(2) get magnesium oxide, ferric oxide, its weight part proportioning is 85: 15, drops into then in the mixer, adds 5% wedding agent water of magnesium oxide and ferric oxide gross weight, mixes; With the material that mixes, after the baler densification, enter the ball press balling-up; Under 25 ℃ of natural temperatures, drying and dehydrating, dewatering time are 2 days after the material balling-up;
(3) material after the drying being put into three-phawse arc furnace, is 2800 ℃ in temperature, fusion 11 hours;
(4) will burn till product under 25 ℃ of natural temperatures, cool off the broken product of cutting or polish jade with an emery wheel out 6 days;
The results are shown in Table 1
Embodiment: 3
Raw material: magnesium oxide: MgO 93.2%, SiO 20.6%, CaO 1.1%, bright alkali 4%, Fe 2O 30.9%, Al 2O 30.2%;
Ferric oxide: Fe 2O 398%, SiO 21.1%.
A kind of magnesium iron spinel sand, its manufacture method is as follows:
(1) magnesium oxide is worn into particle less than 0.6mm, ferric oxide is worn into less than 300 purpose fine powders;
(2) get magnesium oxide, ferric oxide behind the mill, its weight part proportioning is 98: 2, drops into then in the mixer, adds 15% wedding agent water of magnesium oxide and ferric oxide gross weight, mixes; With the material that mixes, after the baler densification, enter the ball press balling-up; Under 20 ℃ of natural temperatures, drying and dehydrating, dewatering time are 4 days after the material balling-up;
(3) material after the drying being put into three-phawse arc furnace, is 3200 ℃ in temperature, fusion 9 hours;
(4) will burn till product under 20 ℃ of natural temperatures, cool off the broken product of cutting or polish jade with an emery wheel out 7 days.
The results are shown in Table 1
Embodiment 4
Raw material: magnesium oxide: MgO 94.6%, SiO 20.5%, CaO 1.1%, bright alkali 3%, Fe 2O 30.6%, Al 2O 30.2%;
Ferric oxide: Fe 2O 398%, SiO 21.0%.
A kind of magnesium iron spinel sand, its manufacture method is as follows:
(1) magnesium oxide is worn into less than 0.6mm particle, ferric oxide is worn into less than 400 purpose fine powders;
(2) get magnesium oxide, ferric oxide behind the mill, its weight part proportioning is 94: 6, then, drops in the mixer, adds 10% wedding agent water of magnesium oxide and ferric oxide gross weight, mixes; With the material that mixes, after the baler densification, enter the ball press balling-up; Under 25 ℃ of natural temperatures, drying and dehydrating, dewatering time are 3 days after the material balling-up;
(3) material after the drying being put into three-phawse arc furnace, is 3000 ℃ in temperature, fusion 10 hours;
(4) will burn till product under 25 ℃ of natural temperatures, cool off the broken product of cutting or polish jade with an emery wheel out 6 days.
The results are shown in Table 1
Table 1

Claims (3)

1, a kind of magnesium iron spinel sand is characterized in that it being to be made by weight ratio by magnesium oxide and ferric oxide, and magnesium oxide and ferric oxide are 100 parts of meters by weight, and the weight part proportioning of magnesium oxide and ferric oxide is 85~98 parts in magnesium oxide, 2~15 parts of ferric oxide;
Wherein, the ferric oxide particles granularity is less than 500 orders, and the magnesium oxide particle granularity is less than 0.6mm.
2, the manufacture method of the described magnesium iron spinel sand of a kind of claim 1 is characterized in that its step is as follows:
(1) ferric oxide is worn into fine powder;
(2) magnesium oxide, ferric oxide are prepared burden by weight ratio;
(3) mixture being put into three-phawse arc furnace, is 2800~3200 ℃ in temperature, fusion 9~11 hours;
(4) will burn till product under natural temperature, cool off the broken product of cutting or polish jade with an emery wheel out 6-7 days.
3, the manufacture method of the described magnesium iron spinel sand of a kind of claim 2, it is characterized in that its step also comprises, after step (2) is prepared burden magnesium oxide, ferric oxide by weight ratio, compound is dropped in the mixer, add 5%~15% wedding agent water of magnesium oxide and ferric oxide gross weight, mix; With the material that mixes, after the baler densification, enter the ball press balling-up; Under natural temperature, drying and dehydrating, dewatering time are 2~4 days after the material balling-up; Dried material is carried out step (3) and step (4) again.
CNB2007100108069A 2007-04-02 2007-04-02 Magnesium iron spinel sand and manufacture method thereof Active CN100567204C (en)

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Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102001858A (en) * 2010-09-21 2011-04-06 河南火宝耐火材料有限公司 High-tenacity mafic spinel brick
CN102503480A (en) * 2011-10-31 2012-06-20 大连秋合耐火材料有限公司 Synthesis method for magnesium-iron spinel refractory material by means of electric smelting
CN102584290A (en) * 2012-02-17 2012-07-18 重庆重冶铜业有限公司 Filling material for furnace bottom of copper refining furnace and filling 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
CN109912312B (en) * 2019-04-25 2022-05-24 郑州金世耐火材料有限公司 Anti-erosion refractory castable

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
高铁低铬碱性砖的特点料及在水泥窑烧成带的应用. 常亮等.中国水泥,第12期. 2002
高铁低铬碱性砖的特点料及在水泥窑烧成带的应用. 常亮等.中国水泥,第12期. 2002 *

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