CN106631061A - High-thermal-conductivity magnesium-rich spinel composite brick for flue wall and preparation method of composite brick - Google Patents

High-thermal-conductivity magnesium-rich spinel composite brick for flue wall and preparation method of composite brick Download PDF

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CN106631061A
CN106631061A CN201611162451.0A CN201611162451A CN106631061A CN 106631061 A CN106631061 A CN 106631061A CN 201611162451 A CN201611162451 A CN 201611162451A CN 106631061 A CN106631061 A CN 106631061A
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composite brick
magnesium
heat conduction
high heat
weight
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CN106631061B (en
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徐琳琳
刘锡俊
任向阳
张吉利
翟鹏涛
胡世平
刘晓磊
陈冰冰
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HENAN RUITAI REFRACTORY TECHNOLOGY Co Ltd
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HENAN RUITAI REFRACTORY TECHNOLOGY Co Ltd
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    • 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
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    • 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
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Abstract

The invention discloses a high-thermal-conductivity magnesium-rich spinel composite brick for a flue wall and a preparation method of the composite brick. The composite brick is mainly prepared from, by weight, 20-50% of magnesite clinker with the particle size smaller than or equal to 4 mm, 25-60% of high-iron magnesia with the particle size smaller than or equal to 4 mm, 1-10% of hercynite with the particle size smaller than or equal to 0.088 mm, 4-20% of magnesium aluminate spinel with the particle size ranging from 1-4 mm and 1-10% of additive, and a binding agent accounting for 2-5% of the total weight of the raw materials is added. Firstly, the raw materials including the magnesite clinker, the high-iron magnesia and the magnesium aluminate spinel are mixed, then the binding agent is added and mixed, the mixture is rolled, and finally the hercynite and the additive are added and evenly mixed with the mixture to obtain a mixed material; the obtained mixed material is pressed to form a green brick; the green brick is sequentially dried and fired, and the composite brick is obtained. The prepared product can effectively reduce energy loss of a furnace wall, the service life is prolonged, energy consumption is reduced, and economic benefits are improved.

Description

A kind of flue wall high heat conduction magnesium-rich spinel composite brick and preparation method thereof
Technical field
The present invention relates to a kind of carbon roasting furnace high performance alkaline refractory material, and in particular to a kind of flue wall is led with height Hot magnesium-rich spinel composite brick and preparation method thereof.
Background technology
Aluminum i ndustry is key pillars of the national economy industry, and the development of Aluminium Industry be unable to do without the development of carbon anode technology. In recent years, the energy consumption of baked anode carbon block is continued to increase, and to the development of aluminium electroloysis industry very big restriction, carbon industry are brought The energy consumption level and power-saving technology of kiln is then the important component part of the energy consumption level for reducing Aluminium Industry.Carbon industry stove Maximum temperature it is general all at 1200～1400 DEG C, and the material and product handled by them have oxidizable, high volatile, The features such as product index and process curve require strict.
At present, China's aluminium cathode anode-baking furnace, using open type annular roasting, production practices show, roaster Heat utilization efficiency and heat loss respectively account for half.The fuel consumption of carbon anode stove finished product per ton is typically in 2.4GJ/t（About convert into one As heavy oil 60kg/t～80kg/t）.At present the roaster of developed country requires that very harsh and pitch is complete in anode material Burning（New technology）Under conditions of, fuel consumption can drop to the heavy oil of 1.8GJ/t～1.9GJ/t.Therefore, aluminium cathode is reduced The adaptable refractory material of the fuel consumption of anode-baking furnace and selection is an important subject.
The content of the invention
The technical problem to be solved in the present invention is：A kind of carbon roasting furnace high heat conduction magnesium-rich spinel composite brick is provided, For the furnace brickwork of carbon roasting furnace；I.e. the present invention provides a kind of flue wall high heat conduction magnesium-rich spinel composite brick and its system Preparation Method.Product high heat conduction magnesium-rich spinel composite brick prepared by the present invention can effectively reduce the energy loss of furnace wall, extend Service life, saving energy consumption, so as to increase economic efficiency.
In order to solve the above problems, the present invention is adopted the technical scheme that：
The present invention provides a kind of flue wall high heat conduction magnesium-rich spinel composite brick, is represented with weight percentage, and the height is led Hot magnesium-rich spinel composite brick is mainly by the magnesite clinker 20～50% of raw material granularity≤4mm, the high ferro magnesia 25 of granularity≤4mm The hercynite 1～10% of～60%, granularity≤0.088mm, the magnesium aluminate spinel 4～20% and additive 1 of 4～1mm of granularity～ 10% composition；It is possible to additionally incorporate the bonding agent for accounting for above-mentioned all raw material gross weights 2～5%.
According to above-mentioned flue wall high heat conduction magnesium-rich spinel composite brick, the quality percentage of MgO in the magnesite clinker Content is 80～95%, Fe2O3Weight/mass percentage composition be 0.5～3%, remaining is impurity content.
According to above-mentioned flue wall high heat conduction magnesium-rich spinel composite brick, the quality percentage of MgO in the high ferro magnesia Content is 75～90%, Fe2O3Weight/mass percentage composition be 4～6%, remaining is impurity content.
According to above-mentioned flue wall high heat conduction magnesium-rich spinel composite brick, Fe in the hercynite2O3Quality hundred Content is divided to be 25～40%, Al2O3Weight/mass percentage composition be 45～65%, remaining is impurity content.
According to above-mentioned flue wall high heat conduction magnesium-rich spinel composite brick, the quality hundred of MgO in the magnesium aluminate spinel Content is divided to be 25～40%, Al2O3Weight/mass percentage composition be 40～65%, remaining is impurity content.
According to above-mentioned flue wall high heat conduction magnesium-rich spinel composite brick, the additive is α-Al2O3Micro mist, zirconium English Sand, TiO2At least one in fine powder and iron scale.
According to above-mentioned flue wall high heat conduction magnesium-rich spinel composite brick, the α-Al2O3The granularity of micro mist is the μ of ＜ 10 M, α-Al2O3Al in micro mist2O3Weight/mass percentage composition ＞ 99%；
The granularity ＜ 0.088mm of the zircon sand, ZrO in zircon sand2 Weight/mass percentage composition be 50～69%, SiO2 Quality Percentage composition is 25～38%；
The TiO2The granularity ＜ 0.045mm of fine powder, TiO2TiO in fine powder2Weight/mass percentage composition >=99.1%；The iron scale Granularity ＜ 0.088mm, Fe in iron scale2O3Weight/mass percentage composition 65～80%.
According to above-mentioned flue wall high heat conduction magnesium-rich spinel composite brick, the bonding agent is combined binder, is combined Bonding agent is composited by spent pulping liquor and bittern, and its proportion is 1.0～1.6g/cm3。
Additionally, it is provided a kind of preparation method of above-mentioned flue wall with high heat conduction magnesium-rich spinel composite brick, the preparation side Method is comprised the following steps：
A, the proportion scale for being first according to above-mentioned high heat conduction magnesium-rich spinel composite brick weigh various raw materials, first by the sintering for weighing Magnesia, high ferro magnesia and magnesium aluminate spinel are initially charged edge runner-wet mill and carry out batch mixing, are subsequently adding bonding agent 5～10min of mixed grind, finally Hercynite and additive are added, mixed material is obtained after mixing；
B, the mixed material for obtaining step a are pressed using hydraulic press or friction press, the pressure of brick machine Power is controlled to 630～2000t, and the bulk density of gained adobe is 3.0g/cm after compacting3；
C, the adobe for obtaining step b are dried 8～24h at 80～160 DEG C；Then burnt till using hyperthermia tunnel Kiln, burnt It is 1550～1650 DEG C into temperature, 3～12h is incubated under this firing temperature, kiln discharge is cooled down after insulation, obtains product high heat conduction rich Magnesia spinel composite brick.
According to the above-mentioned flue wall preparation method of high heat conduction magnesium-rich spinel composite brick, products obtained therefrom high heat conduction richness magnesium point Main chemical compositions in spar composite brick are MgO 80～90%, Al2O31～10% and Fe2O33～15%.
The positive beneficial effect of the present invention：
1st, α-Al are introduced in technical solution of the present invention2O3Micro mist, can be brilliant with the magnalium of periclase generating portion point in sintering process Stone, filling pore；While α-Al2O3Micro mist has higher surface-active, acceleration of sintering；So as to improve the consistency of brick and strong Degree.
2nd, zircon sand is introduced in technical solution of the present invention, because silicate phase has wet periclase, pore is easy to along crystal boundary Exclude so that the apparent porosity of brick is reduced；While MgO and ZrO2Between limited solid solution, promote densification effect, improve brick Intensity；And MgO and ZrO2Difference in physical property, causes internal generation micro-crack, and it can absorb lead crack during thermal shock Strain energy during extension, suppresses and slows down Crack Extension, increased the toughness of material, so as to improve the thermal shock resistance of brick.
3rd, the TiO that technical solution of the present invention is adopted2Fine powder is Detitanium-ore-type, adds TiO2Fine powder, TiO2With periclase reaction Generate Mg2TiO4Spinelle, then Mg2TiO4Spinelle and Mg2AlO4Form Mg4Al2Ti9O25Solid solution；With Mg2TiO4Quilt Mg2AlO4Absorption, solid solution, form the multiphase structure of new square magnesium stone-spinel-titanium oxide silicate system, so as to improve The structural behaviour of material, mechanics, calorifics and performance so as to which product has good sintering character and thermal shock resistance.
4th, iron scale is introduced in technical solution of the present invention, in pyroprocess, FeO is dissolved in periclase, with（Mg·Fe）O shapes Formula is present, Fe2O3Then magnoferrite is formed with periclase, magnoferrite also can be partly dissolved in periclase and form limited Solid solution, so as to promote the combination between matrix and matrix, makes product reach good sintering, improves intensity.
5th, for combined binder, its proportion is 1.0～1.6g/cm to the bonding agent that the present invention is adopted3.Have the advantage that for： 1. adobe pug lubrication is easy to shaping, and base substrate corner angle are good, complete appearance, and green compact just have preferable intensity, it is easy to carry, half into Product rate is high.2. halogen Cl-Steam is grown with facilitation to the crystal development of MA, also helps burning effect, makes product in Under high temperature, higher intensity is remained.
6th, product high heat conduction magnesium-rich spinel composite brick prepared by the present invention can effectively reduce the energy loss of furnace wall, prolong Long life, saving energy consumption, so as to increase economic efficiency.
7th, there is product high heat conduction magnesium-rich spinel composite brick of the present invention higher thermal conductivity factor, good thermal shock to stablize Property, the premium properties such as compressive resistance is high, creep resistance is good, traditional clay brick, high-alumina brick and silica brick can be replaced, in saving energy Source, prolongation furnace lining service life have significant effect.Therefore, the present invention has good economic benefit and social benefit.
8th, the present invention is by introducing α-Al2O3Micro mist and iron scale, in pyroprocess, promote the combination between matrix and matrix, With the magnesium aluminate spinel and magnoferrite of periclase generating portion, surface-active, acceleration of sintering are improved, so as to improve brick body Consistency and intensity.
9th, the present invention is by adding TiO2Fine powder, making the sintering temperature of material reduces, and good burning is reached at a lower temperature Knot, the microcellular structure of many closings formed in sintering process, then improve the thermal shock resistance of material.By introducing zirconium English Sand makes brick body inside produce micro-crack, and it can absorb strain energy when lead crack extends during thermal shock, suppress and slow down Crack Extension, The toughness of material is increased, the thermal shock resistance of brick is also improved.Product high heat conduction magnesium-rich spinel composite brick of the present invention it is comprehensive Close performance indications as shown in table 1.
10th, product of the present invention is applied to carbon roasting furnace, with high thermal conductivity factor, good thermal shock resistance, pressure Intensity is high and creep resistance is good, can replace traditional clay brick, high-alumina brick and silica brick, uses in energy saving, prolongation furnace lining There is good effect in life-span, with good economic benefit and social benefit.
。
Specific embodiment：
The present invention is expanded on further with reference to embodiments, but is not intended to limit present disclosure.
In following examples：The weight/mass percentage composition of MgO is for 80～95%, Fe in the magnesite clinker for adopting2O3Quality hundred Content is divided to be 0.5～3%, remaining is impurity content；The weight/mass percentage composition of MgO is 75～90%, Fe in high ferro magnesia2O3Matter Amount percentage composition is 4～6%, and remaining is impurity content；Fe in hercynite2O3Weight/mass percentage composition be 25～40%, Al2O3Weight/mass percentage composition be 45～65%, remaining is impurity content；The weight/mass percentage composition of MgO in the magnesium aluminate spinel For 25～40%, Al2O3Weight/mass percentage composition be 40～65%, remaining is impurity content.
Using α-Al2O3The granularity of micro mist is 10 μm of ＜, α-Al2O3Al in micro mist2O3Weight/mass percentage composition ＞ 99%； The granularity ＜ 0.088mm of zircon sand, ZrO in zircon sand2 Weight/mass percentage composition be 50～69%, SiO2 Weight/mass percentage composition For 25～38%；TiO2The granularity ＜ 0.045mm of fine powder, TiO2TiO in fine powder2Weight/mass percentage composition >=99.1%；The grain of iron scale Degree ＜ 0.088mm, Fe in iron scale2O3Weight/mass percentage composition 65～80%.
Embodiment 1：
Flue wall of the present invention high heat conduction magnesium-rich spinel composite brick, is represented, by raw material granularity≤4mm's with weight percentage Magnesite clinker 40%, the high ferro magnesia 37% of granularity≤4mm, the hercynite 8% of granularity≤0.088mm, the magnesium of 4～1mm of granularity Aluminate 12% and additive α-Al2O3Micro mist 3% is constituted；It is possible to additionally incorporate the bonding agent for accounting for above-mentioned all raw material gross weights 3%（Knot Mixture is composited by spent pulping liquor and bittern, and its proportion is 1.3g/cm3）.
Embodiment 2：
The flue wall of the embodiment of the present invention 1 preparation method of high heat conduction magnesium-rich spinel composite brick, the detailed step of the preparation method It is rapid as follows：
The proportion scale for being first according to high heat conduction magnesium-rich spinel composite brick described in embodiment 1 weighs various raw materials, first will weigh Magnesite clinker, high ferro magnesia and magnesium aluminate spinel be initially charged edge runner-wet mill and carry out batch mixing, be subsequently adding bonding agent mixed grind 10min, Hercynite and additive are eventually adding, mixed material is obtained after mixing；
B, the mixed material that step a is obtained is pressed using hydraulic press, the Stress control of brick machine is 1000t, the bulk density of gained adobe is 3.0g/cm after compacting3；
C, the adobe for obtaining step b are dried 10h at 120 DEG C；Then burnt till using hyperthermia tunnel Kiln, firing temperature is 1580 DEG C, 6h is incubated under this firing temperature, kiln discharge is cooled down after insulation, obtain product high heat conduction magnesium-rich spinel composite brick（Institute The correlated performance detection index for obtaining product refers to table 2）.
。
Embodiment 3：
Flue wall of the present invention high heat conduction magnesium-rich spinel composite brick, is represented, by raw material granularity≤4mm's with weight percentage Magnesite clinker 35%, the high ferro magnesia 40% of granularity≤4mm, the hercynite 10% of granularity≤0.088mm, 4～1mm's of granularity Magnesium aluminate spinel 10% and additive zircon sand 5% are constituted；It is possible to additionally incorporate the bonding agent for accounting for above-mentioned all raw material gross weights 2.8%（Knot Mixture is composited by spent pulping liquor and bittern, and its proportion is 1.22g/cm3）.
Embodiment 4：
The flue wall of the embodiment of the present invention 3 preparation method of high heat conduction magnesium-rich spinel composite brick, the detailed step of the preparation method It is rapid as follows：
The proportion scale for being first according to high heat conduction magnesium-rich spinel composite brick described in embodiment 3 weighs various raw materials, first will weigh Magnesite clinker, high ferro magnesia and magnesium aluminate spinel be initially charged edge runner-wet mill and carry out batch mixing, be subsequently adding bonding agent mixed grind 8min, most Hercynite and additive are added afterwards, and mixed material is obtained after mixing；
B, the mixed material that step a is obtained is pressed using hydraulic press, the Stress control of brick machine is 1200t, the bulk density of gained adobe is 3.0g/cm after compacting3；
C, the adobe for obtaining step b are dried 8h at 160 DEG C；Then burnt till using hyperthermia tunnel Kiln, firing temperature is 1630 DEG C, 3h is incubated under this firing temperature, kiln discharge is cooled down after insulation, obtain product high heat conduction magnesium-rich spinel composite brick（Institute The correlated performance detection index for obtaining product refers to table 3）.
。
Embodiment 5：
Flue wall of the present invention high heat conduction magnesium-rich spinel composite brick, is represented, by raw material granularity≤4mm's with weight percentage Magnesite clinker 42%, the high ferro magnesia 30% of granularity≤4mm, the hercynite 6% of granularity≤0.088mm, the magnesium of 4～1mm of granularity Aluminate 15% and additive 7%（Additive 7% is the iron scale and 3% α-Al by 4%2O3Micro mist is constituted）Composition；It is possible to additionally incorporate Account for the bonding agent of above-mentioned all raw material gross weights 2.5%（Bonding agent is composited by spent pulping liquor and bittern, and its proportion is 1.4g/cm3）.
Embodiment 6：
The flue wall of the embodiment of the present invention 5 preparation method of high heat conduction magnesium-rich spinel composite brick, the detailed step of the preparation method It is rapid as follows：
The proportion scale for being first according to high heat conduction magnesium-rich spinel composite brick described in embodiment 5 weighs various raw materials, first will weigh Magnesite clinker, high ferro magnesia and magnesium aluminate spinel be initially charged edge runner-wet mill and carry out batch mixing, be subsequently adding bonding agent mixed grind 10min, Hercynite and additive are eventually adding, mixed material is obtained after mixing；
B, the mixed material that step a is obtained is pressed using hydraulic press, the Stress control of brick machine is 1200t, the bulk density of gained adobe is 3.0g/cm after compacting3；
C, the adobe for obtaining step b are dried 18h at 110 DEG C；Then burnt till using hyperthermia tunnel Kiln, firing temperature is 1550 DEG C, 6h is incubated under this firing temperature, kiln discharge is cooled down after insulation, obtain product high heat conduction magnesium-rich spinel composite brick（Institute The correlated performance detection index for obtaining product refers to table 4）.
。
Embodiment 7：
Flue wall of the present invention high heat conduction magnesium-rich spinel composite brick, is represented, by raw material granularity≤4mm's with weight percentage Magnesite clinker 28%, the high ferro magnesia 46% of granularity≤4mm, the hercynite 4% of granularity≤0.088mm, the magnesium of 4～1mm of granularity Aluminate 16% and additive 6%（Additive 6% is the iron scale and 2% TiO by 4%2Fine powder is constituted）Composition；It is possible to additionally incorporate and account for The bonding agent of above-mentioned all raw material gross weights 2.0%（Bonding agent is composited by spent pulping liquor and bittern, and its proportion is 1.12g/cm3）.
Embodiment 8：
The flue wall of the embodiment of the present invention 7 preparation method of high heat conduction magnesium-rich spinel composite brick, the detailed step of the preparation method It is rapid as follows：
The proportion scale for being first according to high heat conduction magnesium-rich spinel composite brick described in embodiment 7 weighs various raw materials, first will weigh Magnesite clinker, high ferro magnesia and magnesium aluminate spinel be initially charged edge runner-wet mill and carry out batch mixing, be subsequently adding bonding agent mixed grind 7min, most Hercynite and additive are added afterwards, and mixed material is obtained after mixing；
B, the mixed material that step a is obtained is pressed using hydraulic press, the Stress control of brick machine is 800t, The bulk density of gained adobe is 3.0g/cm after compacting3；
C, the adobe for obtaining step b are dried 12h at 140 DEG C；Then burnt till using hyperthermia tunnel Kiln, firing temperature is 1650 DEG C, 4h is incubated under this firing temperature, kiln discharge is cooled down after insulation, obtain product high heat conduction magnesium-rich spinel composite brick（Institute The correlated performance detection index for obtaining product refers to table 5）.
。

Claims (10)

1. a kind of flue wall high heat conduction magnesium-rich spinel composite brick, it is characterised in that：Represented with weight percentage, the height Heat conduction magnesium-rich spinel composite brick is mainly by the magnesite clinker 20～50% of raw material granularity≤4mm, the high ferro magnesia of granularity≤4mm The hercynite 1～10% of 25～60%, granularity≤0.088mm, the magnesium aluminate spinel 4～20% and additive 1 of 4～1mm of granularity ～10% composition；It is possible to additionally incorporate the bonding agent for accounting for above-mentioned all raw material gross weights 2～5%.
2. flue wall according to claim 1 high heat conduction magnesium-rich spinel composite brick, it is characterised in that：The sintering magnesium The weight/mass percentage composition of MgO is 80～95%, Fe in sand2O3Weight/mass percentage composition be 0.5～3%, remaining is impurity content.
3. flue wall according to claim 1 high heat conduction magnesium-rich spinel composite brick, it is characterised in that：The high ferro magnesium The weight/mass percentage composition of MgO is 75～90%, Fe in sand2O3Weight/mass percentage composition be 4～6%, remaining is impurity content.
4. flue wall according to claim 1 high heat conduction magnesium-rich spinel composite brick, it is characterised in that：The iron aluminium point Fe in spar2O3Weight/mass percentage composition be 25～40%, Al2O3Weight/mass percentage composition be 45～65%, remaining contains for impurity Amount.
5. flue wall according to claim 1 high heat conduction magnesium-rich spinel composite brick, it is characterised in that：The magnalium point The weight/mass percentage composition of MgO is 25～40%, Al in spar2O3Weight/mass percentage composition be 40～65%, remaining is impurity content.
6. flue wall according to claim 1 high heat conduction magnesium-rich spinel composite brick, it is characterised in that：The additive For α-Al2O3Micro mist, zircon sand, TiO2At least one in fine powder and iron scale.
7. flue wall according to claim 6 high heat conduction magnesium-rich spinel composite brick, it is characterised in that：α-the Al2O3 The granularity of micro mist is 10 μm of ＜, α-Al2O3Al in micro mist2O3Weight/mass percentage composition ＞ 99%；
The granularity ＜ 0.088mm of the zircon sand, ZrO in zircon sand2 Weight/mass percentage composition be 50～69%, SiO2 Quality Percentage composition is 25～38%；
The TiO2The granularity ＜ 0.045mm of fine powder, TiO2TiO in fine powder2Weight/mass percentage composition >=99.1%；The iron scale Granularity ＜ 0.088mm, Fe in iron scale2O3Weight/mass percentage composition 65～80%.
8. flue wall according to claim 1 high heat conduction magnesium-rich spinel composite brick, it is characterised in that：The bonding agent For combined binder, combined binder is composited by spent pulping liquor and bittern, and its proportion is 1.0～1.6g/cm3。
9. a kind of preparation method of high heat conduction magnesium-rich spinel composite brick of flue wall described in claim 1, it is characterised in that institute State preparation method to comprise the following steps：
A, the proportion scale for being first according to high heat conduction magnesium-rich spinel composite brick described in claim 1 weigh various raw materials, first will Magnesite clinker, high ferro magnesia and the magnesium aluminate spinel for weighing is initially charged edge runner-wet mill carries out batch mixing, be subsequently adding bonding agent mixed grind 5～ 10min, is eventually adding hercynite and additive, and mixed material is obtained after mixing；
B, the mixed material for obtaining step a are pressed using hydraulic press or friction press, the pressure of brick machine Power is controlled to 630～2000t, and the bulk density of gained adobe is 3.0g/cm after compacting3；
C, the adobe for obtaining step b are dried 8～24h at 80～160 DEG C；Then burnt till using hyperthermia tunnel Kiln, burnt It is 1550～1650 DEG C into temperature, 3～12h is incubated under this firing temperature, kiln discharge is cooled down after insulation, obtains product high heat conduction rich Magnesia spinel composite brick.
10. the flue wall preparation method of high heat conduction magnesium-rich spinel composite brick according to claim 9, it is characterised in that： Main chemical compositions in products obtained therefrom high heat conduction magnesium-rich spinel composite brick are MgO 80～90%, Al2O31～10% He Fe2O33～15%.
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