CN101186321B - Electric melting magnesium aluminum spinel manufacturing method - Google Patents

Electric melting magnesium aluminum spinel manufacturing method Download PDF

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Publication number
CN101186321B
CN101186321B CN200710168743XA CN200710168743A CN101186321B CN 101186321 B CN101186321 B CN 101186321B CN 200710168743X A CN200710168743X A CN 200710168743XA CN 200710168743 A CN200710168743 A CN 200710168743A CN 101186321 B CN101186321 B CN 101186321B
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bauxite
forsterite
percent
magnesium aluminum
content
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CN101186321A (en
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李远兵
李亚伟
雷中兴
赵雷
段少军
马明军
吴清顺
蔡鄂汉
金胜利
李淑静
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Wuhan University of Science and Engineering WUSE
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Wuhan University of Science and Engineering WUSE
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Abstract

The invention relates to a fused magnesia-alumina spinel and a preparation method thereof. The technical proposal is that: firstly, 18-50wt percent of forsterite and 50-82 percent of bauxite or industrial alumina are mixed, and then 2-10 percent of coke or anthracite and 0.8-2wt percent scrap iron are additionally added to be mixed well; secondly, the mixture is put into an electric arc furnace or an induction furnace for smelting reduction at the temperature of 1800-2300 DEG C to reduce impurities in the forsterite and the bauxite, such as Fe2O3, SiO2, TiO2, etc. and then heat is preserved for 2-5 hours; finally, fused magnesia-alumina spinel is obtained after the mixture is precipitated and separated. The main chemical components of the fused magnesia-alumina spinel are that: the content of MgO is 39-49wt percent; the content of SiO2 is 38-42wt percent; the content of F2O3 is 7-11wt percent. The fused magnesia-alumina spinel prepared by the invention has the advantages of wide application scope, high added value, lower cost and thus realizing effectively comprehensive utilization of forsterite.

Description

A kind of manufacture method of electric melting magnesium aluminum spinel
Technical field
The invention belongs to technical field of refractory materials.Be specifically related to a kind of electric melting magnesium aluminum spinel and manufacture method thereof.
Background technology
China's magnesium resource mainly contains the MgCl that about 3,100,000,000 tons of magnesite reserves, about 3,000,000,000 tons of forsterite reserves, salt lake, Qinghai are contained 2About 3,200,000,000 tons, wherein magnesite mainly concentrates on Liaoning, and forsterite is mainly concentrated Henan Xixia Mine, Shangnan, Shaanxi, Yichang and northeast etc.Be mainly derived from the magnesite in Liaoning as the magnesia of refractory raw material, along with the consumption of magnesia, magnesite resource is growing tension also; And the salt lake, Qinghai provides the extraction cost of magnesia higher and be restricted, and therefore is necessary the forsterite at China middle part is effectively utilized.
The peridotites of occurring in nature is often with forsterite (Mg 2SiO 4) and fayalite (Fe 2SiO 4) formation of sosoloid exists, peridotites mineral deposit and other mineral paragenesis contain a certain amount of chromite and nickel ores etc. and are present in the crack of peridotites crystal grain with the formation of inclusion.In general, the chemical composition of olivine is MgO content 39～49%, SiO 2Content 38～44%, Fe 2O 3Content 7～11% owing to the existence of iron oxide, has reduced high-temperature behavior and the slag resistance of forsterite, has limited the forsterite application.At present, the application of forsterite only limits to casting model powder, metallurgic auxiliary materials, tap hole drainage sand, refractory materials repair material and aspects such as tundish dry ramming mass, forsterite heat light material and material of construction, and application surface is narrower, and the technical value added of product is lower.
Magnesium aluminate spinel (MgAl 2O 4) be a kind of refractory raw material of function admirable, the preparation method divides two kinds of electric smelting method and sintering process, no matter be the synthetic of electric smelting or sintering magnesium aluminate spinel, its raw material A l 2O 3Be mainly derived from bauxite or commercial alumina, MgO derives from light calcined magnesia or magnesite; Such as " alumina-base fused high-purity spinel and preparation method thereof " (ZL200510018056.0) method (ZL88106918.3) etc. of patent of invention, " synthetic MgAl spinal and preparation method thereof " (01115504.3) and synthetic MgAl spinal, MgO in these inventions all derives from the magnesite of resource scarcity or the light calcined magnesia after the light-burned processing of magnesite, and relative cost is higher.
Summary of the invention
The objective of the invention is to reach the high-efficiency comprehensive utilization of forsterite, provide a kind of with forsterite MgO source, applied range, added value height, lower-cost electric melting magnesium aluminum spinel and manufacturing Preparation Method thereof.
For achieving the above object, the technical solution adopted in the present invention is: earlier the forsterite of 18～50wt%, 50～82% bauxite or commercial alumina are mixed, add again the iron filings of 2～10% coke or anthracite, 0.8～2wt%, mix; Then said mixture is inserted in electric arc furnaces or the induction furnace, in 1800～2300 ℃ of melting and reducings, restore the Fe in olivine and the bauxite 2O 3, SiO 2And TiO 2Deng impurity, be incubated 2～5 hours; Finally by precipitation, separation, make electric melting magnesium aluminum spinel.
The main chemical compositions of described forsterite is: MgO content is 39～49wt%, SiO 2Content is 38～42wt%, Fe 2O 3Content is 7～11wt%.
Described bauxite is a kind of in superfine bauxite, one-level bauxite, secondary bauxite category-A, the secondary bauxite category-B, Al 2O 3Content be respectively: the Al of superfine bauxite 2O 3Al greater than 85wt%, one-level bauxite 2O 3Be the Al of 80～85wt%, secondary bauxite category-A 2O 3Be the Al of 70～80wt%, secondary bauxite category-B 2O 3Be 60～70wt%.
Owing to adopt technique scheme, make MgO in the forsterite and the Al in bauxite or the commercial alumina 2O 3Reaction generates magnesium aluminate spinel, separates fully with ferrosilicon.Made electric melting magnesium aluminum spinel applied range, added value height, cost are lower, have reached the high-efficiency comprehensive utilization of forsterite.
Embodiment
Below in conjunction with embodiment the present invention is further described:
Embodiment 1: a kind of electric melting magnesium aluminum spinel and manufacturing Preparation Method thereof.Earlier with the forsterite of 45～50wt%, the superfine bauxite (Al of 50～55wt% 2O 3Greater than 85wt%) mix, add again the coke of 4～6wt% and the iron filings of 0.9～1.2wt%, mix; Then said mixture is placed induction furnace, control stove liquid temp makes the mixture melting and reducing at 1800～1900 ℃, restores the Fe in olivine and the bauxite 2O 3, SiO 2And TiO 2Deng impurity, be incubated 2 hours; Finally by cooling, separation, make electric melting magnesium aluminum spinel.
After testing, the prepared electric melting magnesium aluminum spinel of present embodiment: MgO is 31.3wt%, Al 2O 3Be 62.5wt%, SiO 2Be 2.5wt%, Fe 2O 3For 1.4wt%, bulk density are 3.14g/cm 3
Wherein, the chemical composition of forsterite is: MgO is 46.28wt%, SiO 2Be 39.57wt%, Fe 2O 3Be 8.97wt%, Al 2O 3For 0.35wt%, CaO are that 0.31wt%, igloss are 2.61wt%.
Embodiment 2: a kind of electric melting magnesium aluminum spinel and manufacturing Preparation Method thereof.Earlier with the forsterite of 35～40wt%, the superfine bauxite (Al of 60～65wt% 2O 3Greater than 85wt%) mix, add again the coke of 3～5wt% and the iron filings of 0.8～1wt%, mix; Then said mixture is placed electric arc furnaces, control stove liquid temp makes the mixture melting at 1900～2000 ℃, restores the Fe in olivine and the bauxite 2O 3, SiO 2And TiO 2Deng impurity, be incubated 2 hours; Finally by cooling, separation, make electric melting magnesium aluminum spinel.The forsterite that present embodiment adopted is with embodiment 1.
After testing, the prepared magnesium aluminate spinel of present embodiment: MgO is 23.4wt%, Al 2O 3Be 73.0wt%, SiO 2Be 2.2wt%, Fe 2O 3Be 1.1wt%, bulk density is 3.26g/cm 3
Embodiment 3: a kind of electric melting magnesium aluminum spinel and manufacturing Preparation Method thereof.Earlier with the forsterite of 20～25wt%, the superfine bauxite (Al of 75～80wt% 2O 3Greater than 85wt%) mix, add again the coke of 4～6wt% and the iron filings of 1～1.4wt%, mix; Then said mixture is placed electric arc furnaces, control stove liquid temp makes the mixture melting at 2200～2300 ℃, restores the Fe in olivine and the bauxite 2O 3, SiO 2And TiO 2Deng impurity, be incubated 3 hours; Finally by cooling, separation, make electric melting magnesium aluminum spinel.The forsterite that present embodiment adopted is with embodiment 1.
After testing, the prepared magnesium aluminate spinel of present embodiment: MgO is 10.8wt%, Al 2O 3Be 85.3wt%, SiO 2Be 1.9wt%, Fe 2O 3For 1.0wt%, bulk density are 3.39g/cm 3
Embodiment 4: a kind of electric melting magnesium aluminum spinel and manufacturing Preparation Method thereof.Earlier with the forsterite of 40～45wt%, the one-level bauxite (Al of 55～60wt% 2O 3Be 80～85wt%) to mix, add again the anthracite of 4～6wt% and the iron filings of 1～1.5wt%, mix; Then said mixture is placed electric arc furnaces, control stove liquid temp makes the mixture melting at 1800～1900 ℃, restores the Fe in olivine and the bauxite 2O 3, SiO 2And TiO 2Deng impurity, be incubated 4 hours; Finally by cooling, separation, make electric melting magnesium aluminum spinel.Wherein, the main chemical compositions of forsterite is: MgO is 44.23wt%, SiO 2Be 41.55wt%, Fe 2O 3Be 8.82wt%, Al 2O 3For 0.82wt%, CaO are that 0.57wt%, igloss are 1.91%.
After testing, the prepared magnesium aluminate spinel of present embodiment: MgO is 21.8wt%, Al 2O 3Be 74.0wt%, SiO 2Be 2.0wt%, Fe 2O 3Be 1.0wt%, bulk density is 3.27g/cm 3
Embodiment 5: a kind of electric melting magnesium aluminum spinel and manufacturing Preparation Method thereof.Earlier with the forsterite of 20～25wt%, the one-level bauxite (Al of 75～80wt% 2O 3Be 80～85wt%) to mix, add again the coke of 4～6wt% and the iron filings of 1.2～1.6wt%, mix; Then said mixture is placed electric arc furnaces, control stove liquid temp makes the mixture melting at 1800～1900 ℃, restores the Fe in olivine and the bauxite 2O 3, SiO 2And TiO 2Deng impurity, be incubated 4 hours; Finally by cooling, separation, make electric melting magnesium aluminum spinel.The forsterite that present embodiment adopted is with embodiment 4.
After testing, the prepared magnesium aluminate spinel of present embodiment: MgO is 9.9wt%, Al 2O 3Be 86.3wt%, SiO 2Be 1.6wt%, Fe 2O 3Be 1.1wt%, bulk density is 3.38g/cm 3
Embodiment 6: a kind of electric melting magnesium aluminum spinel and manufacturing Preparation Method thereof.Earlier with the forsterite of 35～40wt%, the secondary bauxite category-A (Al of 60～65wt% 2O 3Be 70～80wt%) to mix, add again the anthracite of 6～8wt% and the iron filings of 1.4～2.0wt%, mix; Then said mixture is placed electric arc furnaces, control stove liquid temp makes the mixture melting at 1800～1900 ℃, restores the Fe in olivine and the bauxite 2O 3, SiO 2And TiO 2Deng impurity, be incubated 5 hours; Finally by cooling, separation, make electric melting magnesium aluminum spinel.Wherein, the main chemical compositions of forsterite is: MgO is 42.39wt%, SiO 2Be 45.21wt%, Fe 2O 3Be 7.98wt%, Al 2O 3For 0.93wt%, CaO are 0.51wt%, igloss is 2.22%.
After testing, the prepared magnesium aluminate spinel of present embodiment: MgO is 22.2wt%, Al 2O 3Be 73.1wt%, SiO 2Be 2.1wt%, Fe 2O 3Be 1.2wt%, bulk density is 3.21g/cm 3
Embodiment 7: a kind of electric melting magnesium aluminum spinel and manufacturing Preparation Method thereof.Earlier with the forsterite of 18～24wt%, the secondary bauxite category-B (Al of 76～82wt% 2O 3Be 60～70wt%) to mix, add again the iron filings of 8～10wt% coke and 1.8～2.0wt%, mix; Then said mixture is placed electric arc furnaces, control stove liquid temp makes the mixture melting at 2000～2100 ℃, restores the Fe in olivine and the bauxite 2O 3, SiO 2And TiO 2Deng impurity, be incubated 3 hours; Finally by cooling, separation, make electric melting magnesium aluminum spinel.The forsterite that present embodiment adopted is with embodiment 1.
After testing, present embodiment 2 prepared magnesium aluminate spinel: MgO are 11.8wt%, Al 2O 3Be 83.3wt%, SiO 2Be 2.2wt%, Fe 2O 3Be 1.4wt%, bulk density is 3.31g/cm 3
Embodiment 8: a kind of electric melting magnesium aluminum spinel and manufacturing Preparation Method thereof.Earlier the forsterite of 22～27wt%, the commercial alumina of 72～78wt% are mixed, add again the coke of 2.0～3.0wt% and the iron filings of 1.0～1.2wt%, mix; Then said mixture is placed electric arc furnaces, control stove liquid temp makes the mixture melting at 2100～2300 ℃, restores the Fe in olivine and the bauxite 2O 3, SiO 2And TiO 2Deng impurity, be incubated 4 hours; Finally by cooling, separation, make electric melting magnesium aluminum spinel.The forsterite that present embodiment adopted is with embodiment 1.
After testing, the prepared magnesium aluminate spinel of present embodiment: MgO is 10.9wt%, Al 2O 3Be 85.5wt%, SiO 2Be 1.4wt%, Fe 2O 3Be 0.5wt%, bulk density is 3.35g/cm 3
Embodiment 9: a kind of electric melting magnesium aluminum spinel and manufacturing Preparation Method thereof.Earlier the forsterite of 46～50wt%, the commercial alumina of 50～54wt% are mixed, add again the coke of 5～7wt% and the iron filings of 1.2～1.6wt%, mix; Then said mixture is placed electric arc furnaces, control stove liquid temp makes the mixture melting at 2000～2100 ℃, restores the Fe in olivine and the bauxite 2O 3, SiO 2And TiO 2Deng impurity, be incubated 3 hours; Finally by cooling, separation, make electric melting magnesium aluminum spinel.The forsterite that present embodiment adopted is with embodiment 6.
After testing, the prepared magnesium aluminate spinel of present embodiment: MgO is 30.5wt%, Al 2O 3Be 65.6wt%, SiO 2Be 1.8wt%, Fe 2O 3Be 0.9wt%, bulk density is 3.14g/cm 3
This specific embodiment can make MgO and the reaction of the Al2O3 in bauxite or the commercial alumina in the forsterite generate magnesium aluminate spinel, separates fully with ferrosilicon.Made electric melting magnesium aluminum spinel applied range, added value height, cost are lower, have reached the high-efficiency comprehensive utilization of forsterite.

Claims (3)

1. the manufacture method of an electric melting magnesium aluminum spinel, it is characterized in that earlier the forsterite of 18～50wt%, 50～82% bauxitic clay or commercial alumina being mixed, add the iron filings of 2～10% coke or hard coal, 0.8～2wt% again, mix; Then said mixture is inserted in electric arc furnace or the induction furnace,, be incubated 2～5 hours in 1800～2300 ℃ of melting and reducings; After precipitation, separate.
2. the manufacture method of electric melting magnesium aluminum spinel according to claim 1, it is characterized in that the main chemical compositions of described forsterite is: MgO content is 39～49wt%, SiO 2Content is 38～42wt%, Fe 2O 3Content is 7～11wt%.
3. the manufacture method of electric melting magnesium aluminum spinel according to claim 1 is characterized in that described bauxite is a kind of in superfine bauxite, one-level bauxite, secondary bauxite category-A, the secondary bauxite category-B, Al 2O 3Content be respectively: the Al of superfine bauxite 2O 3Al greater than 85wt%, one-level bauxite 2O 3Be the Al of 80～85wt%, secondary bauxite category-A 2O 3Be the Al of 70～80wt%, secondary bauxite category-B 2O 3Be 60～70wt%.
CN200710168743XA 2007-12-11 2007-12-11 Electric melting magnesium aluminum spinel manufacturing method Expired - Fee Related CN101186321B (en)

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Publication number Priority date Publication date Assignee Title
CN101429581B (en) * 2008-12-04 2010-06-02 武汉科技大学 Method for producing ferro-silicon alloy and magnesium aluminate spinel with aluminum ash and white olivine
CN101508585A (en) * 2009-03-20 2009-08-19 宜昌鹏搏镁橄榄石有限公司 Process for producing high-purity olivine of fused magnesia
CN101525245B (en) * 2009-03-26 2011-09-21 中钢集团洛阳耐火材料研究院有限公司 High strength non-cement corundum castable material used in heating furnace
CN102617172B (en) * 2012-04-09 2013-09-18 武汉科技大学 Electric smelting magenisum aluminum spinel brick for coal water slurry gasifying furnace and preparation method thereof
CN104193376A (en) * 2014-09-12 2014-12-10 青岛润鑫伟业科贸有限公司 Aluminum-enriched magnesia-alumina spinel refractory material
CN107624081A (en) 2015-03-20 2018-01-23 沙特基础全球技术有限公司 Nickel tephroite and nickel galaxite are used for the purposes of the CO 2 reformation of methane as bulk metal catalyst
CN114315382B (en) * 2021-12-17 2023-05-02 北京金隅通达耐火技术有限公司 Magnesia-alumina spinel prepared by electric melting of hydrated magnesia-alumina bricks and preparation method thereof

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