CN104193356B - A kind of coal slurry gasifier high-purity alumina hollow ball brick and preparation technology thereof - Google Patents

A kind of coal slurry gasifier high-purity alumina hollow ball brick and preparation technology thereof Download PDF

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CN104193356B
CN104193356B CN201410396340.0A CN201410396340A CN104193356B CN 104193356 B CN104193356 B CN 104193356B CN 201410396340 A CN201410396340 A CN 201410396340A CN 104193356 B CN104193356 B CN 104193356B
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hollow ball
alumina hollow
aqueous solution
coal slurry
brick
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CN104193356A (en
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曾鲁举
陈磊
钱蛇大
彭国军
陈松林
吴忠阳
周祖明
蒋顺才
盛华军
万周建
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RUITAI TECHNOLOGY Co Ltd
YIXING RUITAI REFRACTORY MATERIAL Co Ltd
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RUITAI TECHNOLOGY Co Ltd
YIXING RUITAI REFRACTORY MATERIAL Co Ltd
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Abstract

The invention discloses a kind of coal slurry gasifier high-purity alumina hollow ball brick, it comprises the component of following weight percent: 3 ~ 2mm alumina hollow ball 8% ~ 17%, 2 ~ 1mm alumina hollow ball 23% ~ 40%, 1 ~ 0.2mm alumina hollow ball 18% ~ 25%, fused corundom powder 7% ~ 13%, α-Al 2o 3micro mist 20% ~ 25%; The component of the following weight percent of extra interpolation: calcium carbonate 0.8% ~ 1.3%, yellow starch gum or calcium lignin sulphonate aqueous solution 8-12%, ρ-Al 2o 3micro mist 0.5%.The invention also discloses the preparation method of above-mentioned alumina bubble brick.Alumina bubble brick of the present invention forms CA in matrix 6in conjunction with phase, thoroughly change in conventional aluminium oxide hollow ball brick and introduce SiO 2form mullite bonded phase, both increase SiO 2content, reduces again the processing method of use temperature.

Description

A kind of coal slurry gasifier high-purity alumina hollow ball brick and preparation technology thereof
Technical field
The invention belongs to refractory materials, be specifically related to a kind of coal slurry gasifier high-purity alumina hollow ball brick and preparation technology thereof.
Background technology
Because having, the advantage such as alumina content is high, volume density is little, hot strength is large, use temperature is high, thermal conductivity is little, save energy is widely used in petrochemical industry high temperature kiln to high-purity alumina hollow ball brick, it both can be used as heat-insulating heat-preserving material, also can be used for hot operation lining material.
The principal crystalline phase of alumina bubble brick is corundum phase, as purity is too high, not having liquid phase to generate will cause its sintering very difficult, therefore it is suitably introduce a certain amount of silicon-dioxide (adding silicon powder or clay) in batching that traditional alumina bubble brick is produced, to be reacted with aluminum oxide by silicon-dioxide in sintering process and generate mullite phase in matrix, form mullite bonded and obtain sintering, and produce intensity, but the method directly causes silicone content to increase, the use temperature of simultaneous oxidation aluminium hollow ball brick also can decline.
Coal slurry gasifier insulating lining alumina bubble brick general requirement alumina content more than 98%, stricter requirement reaches more than 99%, and dioxide-containing silica controls very strict, is generally and is less than or equal to 0.3%.Because coal slurry gasifier is to the rigors of alumina bubble brick, the method being introduced silicon-dioxide acceleration of sintering formation mullite bonded by direct or indirect mode is infeasible.Therefore finding one can replacement of silicon dioxide, accelerating oxidation aluminium hollow ball brick high temperature sintering, and the production technique simultaneously not affecting its performance is most important.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of alumina bubble brick that can meet coal slurry gasifier service requirements.
The technical problem that the present invention also will solve is to provide the preparation method of above-mentioned alumina bubble brick.
For solving the problems of the technologies described above, the technical solution used in the present invention is as follows:
A kind of coal slurry gasifier high-purity alumina hollow ball brick, it comprises the component of following weight percent:
Above weight percentages of components sum is 100%, extra component of adding following weight percent, and the Calculation Basis of addition is upper composition weight sum:
Calcium carbonate 0.8% ~ 1.3%
The yellow starch gum aqueous solution or the calcium lignin sulphonate aqueous solution 8 ~ 12%
ρ-Al 2o 3micro mist 0.5%.
The present invention preferably fills a prescription, and comprises the component of following weight percent:
Above weight percentages of components sum is 100%, preferably extra component of adding following weight percent, and the Calculation Basis of addition is upper composition weight sum:
Calcium carbonate 0.8% ~ 1.2%
The yellow starch gum aqueous solution or the calcium lignin sulphonate aqueous solution 8 ~ 9%
ρ-Al 2o 3micro mist 0.5%.
Wherein, described fused corundom powder footpath is 325 orders.
Wherein, described α-Al 2o 3grain size of micropowder is 1000 orders.
Wherein, described ρ-Al 2o 3micro mist specific surface area is 200m 2/ g.
Wherein, yellow starch gum or calcium lignin sulphonate concentration of aqueous solution are 30wt%.
Prepare the method for above-mentioned coal slurry gasifier high-purity alumina hollow ball brick, it comprises the steps:
(1) premix fine powder: weigh 325 order fused corundom powder, α-Al by formula ratio 2o 3micro mist, calcium carbonate, ρ-Al 2o 3micro mist add in premixing machine stir until mix;
(2) aggregate mixing: by formula ratio 3 ~ 2mm, 2 ~ 1mm, 1 ~ 0.2mm alumina hollow ball, pour in mixer, be dry mixed 3 ~ 5 minutes, then yellow starch gum or the calcium lignin sulphonate aqueous solution of 2/3 formula ratio is added, mixing 5 ~ 8 minutes, make alumina hollow ball particle surface fully moistening, add the premix fine powder that step (1) obtains again to stir 3 ~ 5 minutes, last yellow starch gum or the calcium lignin sulphonate aqueous solution adding remaining 1/3 formula ratio again, fully stirs discharging in 10-20 minute;
(3) shaping: to adopt hydraulic vibration shaping;
(4) dry: dry 24-48h at 70-140 DEG C;
(5) burn till: at 1700-1750 DEG C, be incubated 3-5h.
In step (4), described oven dry is carried out in dry kiln.
In step (5), described burning till is carried out in high-temperature shuttle kiln.
Raw material used in the present invention:
(1) high-purity alumina hollow ball is Al 2o 3content>=99%, SiO 2content≤0.18%, size comprises 3-2mm, 2-1mm, 1-0.2mm tri-kinds;
(2) fused corundom powder Al 2o 3content>=99%, SiO 2content≤0.18%, size is 325 orders;
(3) α-Al 2o 3micro mist Al 2o 3content>=99%, SiO 2content≤0.18%, introduces micro mist, improves reactive behavior, acceleration of sintering, alleviates sintering difficult problem;
(4) calcium carbonate can be the one in light calcium carbonate, nano-calcium carbonate calcium powder, ordinary calcium carbonate micro mist.By introducing calcium carbonate, it can be utilized on the one hand to start to decompose generation active CaO and CO at about 700 DEG C 2, in alumina bubble brick, form a large amount of pore, increase the apparent porosity of brick; The active CaO generated after utilizing Decomposition of Calcium Carbonate is on the other hand at 1300 DEG C of later and Al 2o 3reaction, generates CA, CA gradually in matrix 2, CA 6, mainly form CA when temperature is elevated to 1500 DEG C later 6in conjunction with phase, along with temperature continues to raise, CA6 crystal is constantly grown up, and brick body is tending towards sintering.The method can improve the intensity of brick, also can evade simultaneously and introduce SiO specially 2form the traditional method of mullite bonded phase, reduce SiO 2content;
(5) ρ-Al is mixed 2o 3, utilize that it is active large, poor heat stability, be in the characteristics such as steady state that are situated between, improve reactive behavior in sintering process, acceleration of sintering, alleviate sintering difficult problem;
Beneficial effect: the present invention compared with prior art has following advantage:
(1) adopt multiple stage material compounding, add ρ-Al 2o 3acceleration of sintering reactive behavior, alleviates the problem of sintering difficulty;
(2) chemical composition purity is high, and foreign matter content is little, and especially Si content is low;
(3) special introducing SiO has been evaded 2form the traditional method of mullite bonded phase, effectively reduce SiO 2content, forming CA6 in conjunction with phase by introducing calcium carbonate, can effectively reduce or avoid the generation of silicon migration in materials'use process, also can improve the use temperature of material simultaneously in matrix;
(4) volume density is little, void content is high, thermal conductivity is low, effectively can reduce heat loss, energy-conserving and environment-protective;
(5) intensity is higher, can meet kiln and build by laying bricks or stones and service requirements, ensures that coal slurry gasifier runs well.
Embodiment
According to following embodiment, the present invention may be better understood.But those skilled in the art will readily understand, the content described by embodiment only for illustration of the present invention, and should can not limit the present invention described in detail in claims yet.
Embodiment 1:
A kind of coal slurry gasifier high-purity alumina hollow ball brick, it comprises the component of following weight percent:
Above weight percentages of components sum is 100%, extra component of adding following weight percent, and the Calculation Basis of addition is upper composition weight sum:
Calcium carbonate 1%
The yellow starch gum aqueous solution 8%
ρ-Al 2o 3micro mist 0.5%.
Preparation method:
325 order fused corundom powder, α-Al is weighed by formula ratio 2o 3micro mist, calcium carbonate, ρ-Al 2o 3micro mist adds stirring in middling speed premixing machine and obtains premix fine powder to mixing in 15 minutes.
By formula ratio 3 ~ 2mm, 2 ~ 1mm, 1 ~ 0.2mm alumina hollow ball, pour in mixer, be dry mixed 3 minutes, then the yellow starch gum aqueous solution of 2/3 formula ratio is added, mixing 7 minutes, make alumina hollow ball particle surface fully moistening, then add premix fine powder and stir 3 minutes, the last yellow starch gum aqueous solution adding remaining 1/3 formula ratio again, fully stirs discharging in 18 minutes.Shaping through hydraulic vibration, dry 48h for 110 DEG C, shuttle kiln 1730 DEG C insulation 3h high temperature burns till.
Embodiment 2:
A kind of coal slurry gasifier high-purity alumina hollow ball brick, it comprises the component of following weight percent:
Above weight percentages of components sum is 100%, extra component of adding following weight percent, and the Calculation Basis of addition is upper composition weight sum:
Calcium carbonate 0.8%
The calcium lignin sulphonate aqueous solution 8.5%
ρ-Al 2o 3micro mist 0.5%.
Preparation method:
325 order fused corundom powder, α-Al is weighed by formula ratio 2o 3micro mist, calcium carbonate, ρ-Al 2o 3micro mist add in middling speed premixing machine stir 15 minutes to mixing obtained premix fine powder.
By formula ratio 3 ~ 2mm, 2 ~ 1mm, 1 ~ 0.2mm alumina hollow ball, pour in mixer, be dry mixed 4 minutes, then the calcium lignin sulphonate aqueous solution of 2/3 formula ratio is added, mixing 6 minutes, make alumina hollow ball particle surface fully moistening, then add premix fine powder and stir 4 minutes, the last calcium lignin sulphonate aqueous solution adding remaining 1/3 formula ratio again, fully stirs discharging in 20 minutes.Shaping through hydraulic vibration, dry 48h for 110 DEG C, shuttle kiln 1700 DEG C insulation 4h high temperature burns till.
Embodiment 3:
A kind of coal slurry gasifier high-purity alumina hollow ball brick, it comprises the component of following weight percent:
Above weight percentages of components sum is 100%, extra component of adding following weight percent, and the Calculation Basis of addition is upper composition weight sum:
Calcium carbonate 1.2%
The calcium lignin sulphonate aqueous solution 9%
ρ-Al 2o 3micro mist 0.5%.
Preparation method:
325 order fused corundom powder, α-Al is weighed by formula ratio 2o 3micro mist, calcium carbonate, ρ-Al 2o 3micro mist add in middling speed premixing machine stir 15 minutes to mixing obtained premix fine powder.
By formula ratio 3 ~ 2mm, 2 ~ 1mm, 1 ~ 0.2mm alumina hollow ball, pour in mixer, be dry mixed 5 minutes, then the calcium lignin sulphonate aqueous solution of 2/3 formula ratio is added, mixing 6 minutes, make alumina hollow ball particle surface fully moistening, then add premix fine powder and stir 5 minutes, the last calcium lignin sulphonate aqueous solution adding remaining 1/3 formula ratio again, fully stirs discharging in 20 minutes.Shaping through hydraulic vibration, dry 48h for 110 DEG C, shuttle kiln 1700 DEG C insulation 3.5h high temperature burns till.
The Product checking of embodiment 1 ~ 3 the results are shown in Table 1.
Table 1
Project Embodiment 1 Embodiment 2 Embodiment 3 Certain user requires index
Al 2O 3 99.04 99.10 98.85 ≥98.5
SiO 2 0.25 0.22 0.22 ≤0.30
Fe 2O 3 0.28 0.28 0.29 ≤0.30
Volume density (g/cm 3) 1.50 1.48 1.49 1.40～1.50
Cold crushing strength (MPa) 12 11.5 15 ≥8
Thermal conductivity (w/m.k) 800 DEG C 0.82 0.83 0.835 ≤0.9
As can be seen from above actual measurement index, alumina bubble brick of the present invention can meet the design requirements of user's coal slurry gasifier.

Claims (4)

1. a coal slurry gasifier high-purity alumina hollow ball brick, is characterized in that, it comprises the component of following weight percent:
Above weight percentages of components sum is 100%, extra component of adding following weight percent, and the Calculation Basis of addition is upper composition weight sum:
Calcium carbonate 0.8% ~ 1.3%
The yellow starch gum aqueous solution or the calcium lignin sulphonate aqueous solution 8 ~ 12%
ρ-Al 2o 3micro mist 0.5%;
Described coal slurry gasifier high-purity alumina hollow ball brick prepares in accordance with the following steps:
(1) premix fine powder: weigh 325 order fused corundom powder, α-Al by formula ratio 2o 3micro mist, calcium carbonate, ρ-Al 2o 3micro mist add in premixing machine stir until mix;
(2) aggregate mixing: by formula ratio 3 ~ 2mm, 2 ~ 1mm, 1 ~ 0.2mm alumina hollow ball, pour in mixer, be dry mixed 3 ~ 5 minutes, then yellow starch gum or the calcium lignin sulphonate aqueous solution of 2/3 formula ratio is added, mixing 5 ~ 8 minutes, make alumina hollow ball particle surface fully moistening, add the premix fine powder that step (1) obtains again to stir 3 ~ 5 minutes, last yellow starch gum or the calcium lignin sulphonate aqueous solution adding remaining 1/3 formula ratio again, fully stirs discharging in 10-20 minute;
(3) shaping: to adopt hydraulic vibration shaping;
(4) dry: dry 24-48h at 70-140 DEG C;
(5) burn till: at 1700-1750 DEG C, be incubated 3-5h.
2. coal slurry gasifier high-purity alumina hollow ball brick according to claim 1, is characterized in that, the described yellow starch gum aqueous solution or the calcium lignin sulphonate aqueous solution, and solute concentration is 30wt%.
3. coal slurry gasifier high-purity alumina hollow ball brick according to claim 1, is characterized in that, in step (4), described oven dry is carried out in dry kiln.
4. coal slurry gasifier high-purity alumina hollow ball brick according to claim 1, is characterized in that, in step (5), described burning till is carried out in high-temperature shuttle kiln.
CN201410396340.0A 2014-08-12 2014-08-12 A kind of coal slurry gasifier high-purity alumina hollow ball brick and preparation technology thereof Active CN104193356B (en)

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CN104671802B (en) * 2015-01-16 2017-01-04 长兴正发热电耐火材料有限公司 A kind of light thermal-shield refractory mud and preparation method thereof
CN105399407A (en) * 2015-11-19 2016-03-16 长兴县新宏信耐火材料有限公司 Preparation method for novel aluminium oxide hollow ball brick
CN105294024A (en) * 2015-11-19 2016-02-03 长兴县新宏信耐火材料有限公司 Novel alumina bubble brick
CN105859315B (en) * 2016-03-31 2019-03-19 武汉科技大学 A kind of lightweight dispersive air brick and preparation method thereof
CN107244907A (en) * 2017-05-26 2017-10-13 长兴华悦耐火材料厂 A kind of toughening aluminum oxide hollow balls brick
CN107235741A (en) * 2017-06-30 2017-10-10 长兴泓矿炉料有限公司 A kind of New type of light refractory material
CN114368974A (en) * 2022-01-21 2022-04-19 巩义市神南特种耐火材料厂 Alumina hollow ball brick and preparation method thereof

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CN101113100A (en) * 2007-06-30 2008-01-30 郑州大学 High-purity corundum pouring material containing nano calcium carbonate and preparation method thereof
CN102276276A (en) * 2011-07-22 2011-12-14 中钢集团洛阳耐火材料研究院有限公司 Alumina hollow ball insulation product
CN103708841A (en) * 2013-12-05 2014-04-09 山东耐材集团鲁耐窑业有限公司 High strength and high thermal shock alumina bubble brick and preparation method thereof

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101113100A (en) * 2007-06-30 2008-01-30 郑州大学 High-purity corundum pouring material containing nano calcium carbonate and preparation method thereof
CN102276276A (en) * 2011-07-22 2011-12-14 中钢集团洛阳耐火材料研究院有限公司 Alumina hollow ball insulation product
CN103708841A (en) * 2013-12-05 2014-04-09 山东耐材集团鲁耐窑业有限公司 High strength and high thermal shock alumina bubble brick and preparation method thereof

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