CN107089835A - Carbon calciner andalusite mullite composite brick and preparation method thereof - Google Patents

Carbon calciner andalusite mullite composite brick and preparation method thereof Download PDF

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Publication number
CN107089835A
CN107089835A CN201710302792.1A CN201710302792A CN107089835A CN 107089835 A CN107089835 A CN 107089835A CN 201710302792 A CN201710302792 A CN 201710302792A CN 107089835 A CN107089835 A CN 107089835A
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content
andalusite
mullite
brick
composite brick
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徐琳琳
刘锡俊
任向阳
翟鹏涛
胡世平
刘晓磊
刘昭
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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    • C04B35/01—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
    • C04B35/16—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 silicates other than clay
    • C04B35/18—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 silicates other than clay rich in aluminium oxide
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Abstract

The present invention relates to refractory industry field, more particularly to a kind of carbon calciner andalusite mullite composite brick and preparation method thereof, include the material A of following percentage by weight：40~60wt% of sintered high aluminium alumina, 10~30wt% of electrofused mullite, 15~25wt% of andalusite, 5~15wt% of kaolin, 1~5wt% of additive, in addition to bonding agent, the bonding agent are 2~5 by weight ratio with material A:100, the brick has good heat conductivility, and low-thermal-expansion rate, good thermal shock stability, intensity is high, and creep properties is small etc..Traditional clay brick can be replaced, high-alumina brick can save the energy, extend furnace lining service life, with good economic benefit and social benefit.

Description

Carbon calciner andalusite-mullite composite brick and preparation method thereof
Technical field
The present invention relates to refractory industry field, more particularly to a kind of carbon calciner are compound with andalusite-mullite Brick and preparation method thereof.
Background technology
Carbon calcination technique is most important technical process in carbon anode production process, and carbon calciner is charcoal element production Main calciner, calcine technology is exactly petroleum coke raw material to be sintered into after the section with certain mechanical strength and physical and chemical index Petroleum coke, abbreviation calcined coke.Calcined coke is the primary raw material of carbon anode production, and the quality of calcined coke decides the matter of anode block Amount.With calcining technology progress and the development of industry, most calcining furnace quirk layers are changed to eight layers by original six layers, have elongated and have forged Band is burnt, material calcining temperature is improved.Reduced simultaneously with the petroleum coke raw material of carbon calciner high-quality, impurity component in raw material It is more and more, the increase of high sulfur petroleum coke raw material so that the working condition of carbon calciner is very harsh, to fire proof material of furnace lining Erosion it is also even more serious, kiln service life is also decreased, and traditional silica brick, high-alumina brick etc. can not meet production need Ask.Therefore, new high-quality refractory material is developed, its high-temperature behavior and corrosion resistance is improved, is forged so as to ensure and extend charcoal element The service life of stove is burnt, is the important subject that carbon industry and fire resisting industry are paid close attention to jointly.
The content of the invention
Present invention aims to overcome that there is provided a kind of carbon calciner andalusite-mullite for deficiency of the prior art Composite brick and preparation method thereof.
The present invention is achieved by the following technical solutions：A kind of carbon calciner andalusite-mullite composite brick, bag Include the material A of the raw material proportioning by following percentage by weight：40~60wt% of sintered high aluminium alumina, electrofused mullite 10~ 30wt%, 15~25wt% of andalusite, 5~15wt% of kaolin, 1~5wt% of additive, in addition to bonding agent, the combination Agent is 2~5 by weight ratio with material A:100, wherein the sintered high aluminium alumina granularity≤5mm, the electrofused mullite grain Degree≤0.088mm, the andalusite granularity≤0.074mm, the kaolinite soil granularity≤0.044mm, the kaolin are selected from wide Western white clay and Suzhou soil one kind therein.
Preferably, Al in the sintered high aluminium alumina2O3Content 60~75wt%, Fe2O3Content≤3wt%, remaining For impurity content.
Preferably, Al in the electrofused mullite2O3Content be 60~70wt%, SiO2Content be 25~35wt%, Fe2O3Content≤0.8wt%, remaining is impurity content.
Preferably, Al in the andalusite2O3Content be 50~60wt%, SiO2Content be 35~45wt%, Fe2O3 Content≤1.5wt%, remaining is impurity content.
Preferably, Al in the Guangxi white clay2O3Content be 35~40wt%, SiO2Content be 40~50wt%, Fe2O3Content be≤1.0wt%, remaining is impurity content, Al in the Suzhou soil2O3Content be 30~35wt%, SiO2 Content be 45~50wt%, Fe2O-3Content be≤0.8wt%, remaining is impurity content.
Preferably, the additive is selected from TiO2Fine powder, α-Al2O3At least one of micro mist, iron scale.
Preferably, the TiO2Granularity the ＜ 0.044mm, the TiO of fine powder2TiO in fine powder2Content >=98wt%；Institute State α-Al2O3The granularity of micro mist is 5~10 μm, the α-Al2O3Al in micro mist2O3Content ＞ 99wt%；The grain of the iron scale Spend Fe in ＜ 0.088mm, iron scale2O3Content be 65~80wt%.
Preferably, the bonding agent is the phosphoric acid solution of proportion 1.30~1.35.
A kind of carbon calciner preparation method of andalusite-mullite composite brick, comprises the following steps：
A, material A and bonding agent are weighed, first first add the sintered high aluminium alumina weighed in edge runner-wet mill, carry out batch mixing 10min, then adds bonding agent 5~10min of mixed grind, then sequentially adds electrofused mullite, andalusite, kaolin and addition Agent, adds at intervals of 2~3min, 20~30min of mixed grind, obtains mixed material；
B, the mixed material for obtaining step a are pressed using brick machine is wiped, and the Stress control of brick machine is 630 ~2000t, the bulk density of gained adobe is 2.6~2.9g/cm after compacting3；
8~24h is dried in c, the adobe for obtaining step b at 80~160 DEG C；Then burnt using hyperthermia tunnel Kiln Into firing temperature is 1450~1600 DEG C, and 4~12h is incubated under this firing temperature, kiln discharge is cooled down after insulation, obtains product red Pillar-mullite composite brick.
The beneficial effects of the present invention are：
1st, TiO is introduced in technical solution of the present invention2Fine powder, promotes material to reach good burning under relatively low firing temperature Knot, Ti4+Diffusion promote TiO2With Al2O3Form aluminium titanates (Al2TiO3) solid solution reaction it is more complete, accelerate material The sintering process of material.This is advantageous for product crystallite dimension and growed, while strengthening Al2O3Between mullite directly in conjunction with, Composite thermal shock resistance and intensity are improved for it.
2nd, α-Al are introduced in technical solution of the present invention2O3Micro mist, activation and disordering due to its surface particle, thus tool Have that energy state is high, activity is big, the characteristics of acceleration of sintering.Promote sintering dominant mechanism：1) micro mist is added in right amount, because calking reduces gas Hole；2) micro mist is distributed in grain edges, because of its surface-active and particle mobility, can be combined with particle more in relatively low temperature Good, so that enclosure portion insertion stomata, promotion product institutional framework is more fine and close, intensity, refractoriness under load are improved for it.
3rd, introduced in technical solution of the present invention in iron scale, pyroprocess, FeO is dissolved in periclase, with (MgFe) O shapes Formula is present, Fe2O3Then with periclase formation magnoferrite, magnoferrite can also 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.
4th, the bonding agent that the present invention is used is phosphoric acid solution, phosphoric acid H3PO4The usually combination of acid and neutral refractory Agent, is modulated to 60% concentration transparent aqueous solution, its plasticity, addition inhibitor can be kept for a long time, it is not necessary to ageing mixture.Bonding agent is excellent Point：Adobe pug lubrication is easy to shaping, and base substrate corner angle are good, and complete appearance, semi-finished product green has high intensity, it is easy to carry, Semi-finished product rate is high, also helps burning effect, makes product at high temperature, remains higher intensity.
5th, product andalusite-mullite composite brick prepared by the present invention has good heat conductivility, low-thermal-expansion rate, heat Shake stability good, intensity is high, creep properties is small, the energy can be saved, extend furnace lining service life, with good economic benefit and society Can benefit.
6th, the mullitization effect of product andalusite-mullite composite brick of the present invention assigns brick good performance：
1. about 1300 DEG C of andalusites can be converted into mullite under high temperature：
3(Al2O3·SiO2)Andalusite→Al2O3·SiO2 (primary mullites)+SiO2, primary mullite rise " fiber reinforcement " effect, carry High products machinery performance；
2. raised with temperature, about decompose complete in 1480 DEG C of andalusites, mullite growing amount increases, at the same with part SiO2 With aluminium micro mist reaction generation secondary mullite in matrix：
3Al2O3+2SiO2→3Al2O3·2SiO2 (secondary mullites), secondary mullite, which is in granular form, is evenly distributed on whole product In, play bridge joint toughening effect.
7th, product andalusite of the present invention-mullite composite brick performance characteristics are：In low thermal expansion, composite brick andalusite without By granularity thickness, maximum volume expansivity is in 5% or so, linear expansivity 1-1.5%, and the superiority of this slight thermal expansion can The volume contraction of product is avoided, so as to ensure that refractory brick brickwork joint is tightly combined or ftractureed less.
8th, the crystallization process of product andalusite-mullite composite brick of the present invention is process progressively deep since the surface, Slowly evenly carried out since about 1200 DEG C, typically 1400 DEG C start rapid conversions, its final conversion temperature at 1600 DEG C, The mullite of generation about 83% and 16-17% Silicon-rich glass phase when converting complete, mullite are shaped as needle-like, threadiness, net Network shape etc., serves very crucial, is also the basic institute of product good thermal shock to the high-temperature behavior and toughness for improving material .
9th, product andalusite-mullite composite brick of the present invention is applied to carbon calciner, and with high thermal conductivity, low is swollen Swollen rate, good thermal shock resistance, compressive resistance is high, and creep resistance is good, can replace traditional clay brick, high-alumina brick and silicon Brick, can save the energy, have good effect to extension furnace lining service life.
The integrated performance index of the product andalusite-mullite composite brick of the present invention of table 1.
Table 1
Embodiment：
The present invention is expanded on further with reference to embodiments, but is not intended to limit present disclosure.
Al in wherein sintered high aluminium alumina granularity≤5mm, sintered high aluminium alumina in following examples2O3Content 60~ 75wt%, Fe2O3Content≤3wt%, remaining is impurity content；In electrofused mullite granularity≤0.088mm, electrofused mullite Al2O3Content be 60~70wt%, SiO2Content be 25~35wt%, Fe2O3Content≤0.8wt%, remaining is impurity Content；Al in andalusite granularity≤0.074mm, andalusite2O3Content be 50~60wt%, SiO2Content for 35~ 45wt%, Fe2O3Content≤1.5wt%, remaining is impurity content；In Guangxi White mud pellet degree≤0.044mm, Guangxi white clay Al2O3Content be 35~40wt%, SiO2Content be 40~50wt%, Fe2O3Content be≤1.0wt%, remaining is miscellaneous Matter content；Al in Suzhou soil granularity≤0.044mm, Suzhou soil2O3Content be 30~35wt%, SiO2Content for 45~ 50wt%, Fe2O3Content be≤0.8wt%, remaining is impurity content；TiO2Granularity the ＜ 0.044mm, TiO of fine powder2Fine powder Middle TiO2Content >=98wt%；α-Al2O3The granularity of micro mist is 5~10 μm, α-Al2O3Al in micro mist2O3Content ＞ 99wt%；Fe in the granularity ＜ 0.088mm of iron scale, iron scale2O3Content be 65~80wt%.
Embodiment 1
A kind of carbon calciner andalusite-mullite composite brick and preparation method thereof, includes the raw material of following weight：Burn Tie alumine 60Kg, electrofused mullite 15Kg, andalusite 15Kg, Guangxi white clay 7Kg, TiO2Fine powder 3Kg, in addition to proportion is 1.30 phosphoric acid solution 4Kg.
Preparation method is as follows：
A, raw material is weighed, first first add the sintered high aluminium alumina weighed in edge runner-wet mill, carry out batch mixing 10min, Ran Houjia Enter phosphoric acid solution mixed grind 10min, then sequentially add electrofused mullite, andalusite, Guangxi white clay and TiO2Fine powder, addition interval For 2min, mixed grind 30min, mixed material is obtained；
B, the mixed material for obtaining step a are pressed using brick machine is wiped, and the Stress control of brick machine is 1000t, the bulk density of gained adobe is 2.8g/cm after compacting3；
12h is dried in c, the adobe for obtaining step b at 150 DEG C；Then burnt till using hyperthermia tunnel Kiln, burn till temperature Spend for 1500 DEG C, kiln discharge is cooled down after 6h, insulation are incubated under this firing temperature, obtain product andalusite-mullite composite brick.
The present embodiment products obtained therefrom performance test results are shown in Table 2.
Embodiment 2
A kind of carbon calciner andalusite-mullite composite brick and preparation method thereof, includes the raw material of following weight：Burn Tie alumine 55Kg, electrofused mullite 20Kg, andalusite 15Kg, Suzhou soil 5Kg, α-Al2O3Micro mist 5Kg, in addition to proportion is 1.32 phosphoric acid solution 3.5Kg.
Preparation method is as follows：
A, raw material is weighed, first first add the sintered high aluminium alumina weighed in edge runner-wet mill, carry out batch mixing 10min, Ran Houjia Enter phosphoric acid solution mixed grind 8min, then sequentially add electrofused mullite, andalusite, Suzhou soil and α-Al2O3Micro mist, addition interval For 3min, mixed grind 30min, mixed material is obtained；
B, the mixed material for obtaining step a are pressed using brick machine is wiped, and the Stress control of brick machine is 1200t, the bulk density of gained adobe is 2.9g/cm after compacting3；
8h is dried in c, the adobe for obtaining step b at 1200 DEG C；Then burnt till using hyperthermia tunnel Kiln, burn till temperature Spend for 1450 DEG C, kiln discharge is cooled down after 8h, insulation are incubated under this firing temperature, obtain product andalusite-mullite composite brick.
The present embodiment products obtained therefrom performance test results are shown in Table 2.
Embodiment 3
A kind of carbon calciner andalusite-mullite composite brick and preparation method thereof, includes the raw material of following weight：Burn Tie alumine 50Kg, electrofused mullite 10Kg, andalusite 20Kg, Guangxi white clay 15Kg, α-Al2O3Micro mist 2Kg, iron scale 3Kg, Also include the phosphoric acid solution 5Kg that proportion is 1.35.
Preparation method is as follows：
A, raw material is weighed, first first add the sintered high aluminium alumina weighed in edge runner-wet mill, carry out batch mixing 10min, Ran Houjia Enter phosphoric acid solution mixed grind 10min, then sequentially add electrofused mullite, andalusite, Guangxi white clay, α-Al2O3Micro mist, iron scale, add Plus at intervals of 2min, 20~30min of mixed grind, obtain mixed material；
B, the mixed material for obtaining step a are pressed using brick machine is wiped, and the Stress control of brick machine is 630t, the bulk density of gained adobe is 2.7g/cm after compacting3；
18h is dried in c, the adobe for obtaining step b at 110 DEG C；Then burnt till using hyperthermia tunnel Kiln, burn till temperature Spend for 1550 DEG C, kiln discharge is cooled down after 6h, insulation are incubated under this firing temperature, obtain product andalusite-mullite composite brick.
The present embodiment products obtained therefrom performance test results are shown in Table 2.
Embodiment 4
A kind of carbon calciner andalusite-mullite composite brick and preparation method thereof, includes the raw material of following weight：Burn Alumine 40Kg, electrofused mullite 30Kg, andalusite 15Kg, Suzhou soil 10Kg, iron scale 5Kg are tied, in addition to proportion is 1.30 Phosphoric acid solution 2.5Kg.
Preparation method is as follows：
A, raw material is weighed, first first add the sintered high aluminium alumina weighed in edge runner-wet mill, carry out batch mixing 10min, Ran Houjia Enter phosphoric acid solution mixed grind 7min, then sequentially add electrofused mullite, andalusite, Suzhou soil, iron scale, add at intervals of 2min, Mixed grind 20min, obtains mixed material；
B, the mixed material for obtaining step a are pressed using brick machine is wiped, and the Stress control of brick machine is 1600t, the bulk density of gained adobe is 2.84g/cm after compacting3；
24h is dried in c, the adobe for obtaining step b at 80 DEG C；Then burnt till using hyperthermia tunnel Kiln, burn till temperature Spend for 1600 DEG C, kiln discharge is cooled down after 10h, insulation are incubated under this firing temperature, obtain product andalusite-mullite composite brick.
The present embodiment products obtained therefrom performance test results are shown in Table 2.
Table 2

Claims (9)

1. a kind of carbon calciner andalusite-mullite composite brick, it is characterised in that including the original by following percentage by weight Expect the material A of proportioning：40~60wt% of sintered high aluminium alumina, 10~30wt% of electrofused mullite, andalusite 15~ 25wt%, 5~15wt% of kaolin, 1~5wt% of additive, in addition to bonding agent, the bonding agent are matched somebody with somebody by weight with material A Than for 2~5:100, wherein the sintered high aluminium alumina granularity≤5mm, the electrofused mullite granularity≤0.088mm, described red Pillar granularity≤0.074mm, the kaolinite soil granularity≤0.044mm, the kaolin is selected from Guangxi white clay and Suzhou soil wherein One kind.
2. carbon calciner according to claim 1 andalusite-mullite composite brick, it is characterised in that the sintering Al in alumine2O3Content 60~75wt%, Fe2O3Content≤3wt%, remaining is impurity content.
3. carbon calciner according to claim 1 andalusite-mullite composite brick, it is characterised in that the electric smelting Al in mullite2O3Content be 60~70wt%, SiO2Content be 25~35wt%, Fe2O3Content≤0.8wt%, its Remaining is impurity content.
4. carbon calciner according to claim 1 andalusite-mullite composite brick, it is characterised in that the red post Al in stone2O3Content be 50~60wt%, SiO2Content be 35~45wt%, Fe2O3Content≤1.5wt%, remaining is Impurity content.
5. carbon calciner according to claim 1 andalusite-mullite composite brick, it is characterised in that the Guangxi Al in white clay2O3Content be 35~40wt%, SiO2Content be 40~50wt%, Fe2O3Content be≤1.0wt%, its Remaining is Al in impurity content, the Suzhou soil2O3Content be 30~35wt%, SiO2Content be 45~50wt%, Fe2O3's Content is≤0.8wt%, and remaining is impurity content.
6. carbon calciner according to claim 1 andalusite-mullite composite brick, it is characterised in that the addition Agent is selected from TiO2Fine powder, α-Al2O3At least one of micro mist, iron scale.
7. carbon calciner according to claim 6 andalusite-mullite composite brick, it is characterised in that the TiO2Carefully Granularity the ＜ 0.044mm, the TiO of powder2TiO in fine powder2Content >=98wt%；α-the Al2O3The granularity of micro mist be 5~ 10 μm, the α-Al2O3Al in micro mist2O3Content ＞ 99wt%；In the granularity ＜ 0.088mm of the iron scale, the iron scale Fe2O3Content be 65~80wt%.
8. carbon calciner according to claim 1 andalusite-mullite composite brick, it is characterised in that：The combination Agent is the phosphoric acid solution of proportion 1.30~1.35.
9. according to preparation method of any one of the claim 1-8 carbon calciners with andalusite-mullite composite brick, it is special Levy and be, comprise the following steps：
A, material A and bonding agent are weighed, first first add the sintered high aluminium alumina weighed in edge runner-wet mill, carry out batch mixing 10min, so Bonding agent 5~10min of mixed grind is added afterwards, electrofused mullite, andalusite, kaolin and additive is then sequentially added, between addition 2~3min, 20~30min of mixed grind are divided into, mixed material is obtained；
B, the mixed material for obtaining step a are pressed using brick machine is wiped, the Stress control of brick machine for 630~ 2000t, the bulk density of gained adobe is 2.6~2.9g/cm after compacting3；
8~24h is dried in c, the adobe for obtaining step b at 80~160 DEG C；Then burnt till, burnt using hyperthermia tunnel Kiln Into temperature be 1450~1600 DEG C, under this firing temperature be incubated 4~12h, cool down kiln discharge after insulation, obtain product andalusite- Mullite composite brick.
CN201710302792.1A 2017-05-03 2017-05-03 Carbon calciner andalusite mullite composite brick and preparation method thereof Pending CN107089835A (en)

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