CN1884201A - Permeable fireproof materials for aluminium refining and process for preparing same - Google Patents
Permeable fireproof materials for aluminium refining and process for preparing same Download PDFInfo
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- CN1884201A CN1884201A CN 200610018089 CN200610018089A CN1884201A CN 1884201 A CN1884201 A CN 1884201A CN 200610018089 CN200610018089 CN 200610018089 CN 200610018089 A CN200610018089 A CN 200610018089A CN 1884201 A CN1884201 A CN 1884201A
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Abstract
The invention discloses a poromeric fire-proof material and preparing method of refined aluminum, which comprises the following parts: 60-92 percent sintered compact calcium hexaluminate, 8-30 percent auxiliary material and 2.5-5.5 percent binder, wherein the auxiliary material is some or all of board-shaped corundum, electric melting white corundum, mild-clay, quartz, kyanite, chromium hemitrioxide green and zircon. The preparing method comprises the following steps: blending poromeric fire-proof material and binder completely; loading the material in the mould; placing the mould on the vibrating platform; pressurizing on the material at 10-20 ton; vibrating at 3-5 mm amplitude at 5-15 s; sintering at 1400-1700 deg.c.
Description
Technical field
The invention belongs on the aluminium melting refining casting process equipment of aluminium deep processing industry a kind of breathable refractory materials of (comprise insulation leave standstill the outer online a refining unit degasification tank of stove, chute and stove), relate generally to a kind of permeable fireproof materials for aluminium refining and preparation method thereof.It can effectively improve aluminium liquid quality and simple and easy to do.
Background technology
The fusion process of aluminium alloy has comprised the series of physical chemical transformation, is characterized in: 1. fusing time is long; 2. oxidation easily; 3. air-breathing easily; 4. absorb metallic impurity easily.Therefore, very easily contaminated in the process of melting.A major issue the when pollution that prevents impurity is aluminium and aluminium alloy smelting.
Purifying aluminium alloy melt is the gordian technique that guarantees the aluminum alloy materials metallurgical quality, is the problem of academia and business circles extensive concern.The purpose of purifying aluminium alloy melt mainly is to reduce the content of hydrogen content and oxide inclusion in the melt.To the requirement of aluminium alloy melt cleanliness factor, the general advanced international level of the content of hydrogen is 0.15ml/100gAl, and 0.10ml/100gAl is the leading level in the world.Oxide inclusion does not allow micron-sized particle and aggregation.As seen, the cleanliness factor of aluminium alloy melt is required to be strict.Reach above-mentioned requirements, need to adopt various advanced persons' cleaning molten treatment technology.
In recent years along with aluminium processing industry market competition is growing more intense, to the more and more higher requirement of quality proposition of aluminium product.As aluminium processing industry melting and casting operation foremost, the advance of its technology and the quality of quality product play keying action to the quality of aluminium processing industry the finished product.New technologies such as the automatic control of type of furnace large-tonnageization, regenerative combustion technology, furnace temperature furnace pressure, induction stirring refinery practice, aluminium melt purifying technology leave standstill progressively popularization on the stove in the major equipment smelting furnace and the insulation of founding production line for refining.Both at home and abroad aluminium melt purifying technology mainly contains bubble swim method, vacuum processing method, ultrasonication method, rare earth dehydrogenation method.The bubble the most popular and tool development prospect of method of swimming wherein.And leave standstill stove, chute, degasification tank bottom and sidewall the impurity and purification technology that the air blowing air permeation device is blown is installed in molten aluminium in insulation, be the bubble method of swimming, can play and remove gas or oxide inclusion, uniform temperature and composition, shortening refining time, improve thermo-efficiency, reduce slag, alleviate effect such as labor strength, also having little, simple and easy to do, efficient, the non-harmful characteristics of investment, is the purification treatment technology that is suitable for applying most.Aluminium liquid not only makes the aluminium quality product be affected with the reaction between the refractory lining, and makes furnace lining surface cord, bulge and sediment miscellaneous object.Therefore selected material should have very high chemical stability, does not react with aluminium liquid; The material of selecting also should and aluminium liquid between wetting angle big, make aluminium liquid be difficult for infiltration.The traditional refractory materials that is applied to aluminum smelting industry at present is alumina or flint clay material, SiO in alumina or the flint clay material
2, Fe
2O
3And TiO
2Deng can with fine aluminium or aluminium alloy generation redox reaction, be reduced to simple substance, severe contamination aluminium liquid.
The general refractory product of making adopts friction press or hydropress moulding, but for the ventilative goods of moulding, if adopt above-mentioned press-molding, inner each the position structure of goods is inhomogeneous, thereby causes that each position physical and chemical performance difference of goods is big, goods Gas permeability and flow rate fluctuation be big, and internal porosity is big and connect, the bubble that blows out when making gas by ventilative goods is bigger, not only do not have the effect of removing small gas or oxide inclusion, also can introduce more greatly and be mingled with, pollute aluminium liquid.
Summary of the invention
The purpose of this invention is to provide a kind of permeable fireproof materials for aluminium refining and preparation method thereof, the breathable refractory materials that makes it utilize this making method to produce, has rationally uniform ventilating structure, can prevent effectively that aluminium liquid from leaking out from gas permeable material, the bubble that blows out by gas permeable material is little and many, aluminium liquid is difficult for infiltrating, and can effectively improve aluminium liquid quality and simple and easy to do.
Purpose of the present invention can adopt following technical scheme to realize: being used to prepare described breathable refractory materials raw material composition weight ratio is:
Sintering synthesis of densified calcium hexaluminate material 60～92%
Subsidiary material 8～30%
Add wedding agent 2.5～5.5%
Wherein, subsidiary material are several or whole in plate diamond spar, fused white corundum, soft clay, quartz, kyanite, chromoxide green and the zircon material.
The particle diameter of 60～90% in the described preparation breathable refractory materials raw material is 0.5～2mm, and particle shape is the circular and oval of no arris edge.
The preparation method of breathable refractory materials of the present invention is: will be used to prepare described breathable refractory materials raw material and wedding agent thorough mixing, the forming mould of packing into, be placed on the shaking platform of vibration pressure forming machine, pressurize on material top, the pressure of pressurization is the 10-20 ton, shaking platform vibration in the time of pressurization, and amplitude is 3～5mm, time of vibration 5-15 second, last 1400-1700 ℃ of high temperature burns till.
Raw material of the present invention mainly consists of sintering synthesis of densified calcium hexaluminate material, and it is for to have very high chemical purity than higher aluminum class material, and the reducing power of opposing aluminium liquid or alloy is strong.Though the temperature of liquid aluminium is lower than 900 ℃, but high productivity causes more charge amount and higher furnace temperature at present, furnace temperature usually meets or exceeds 1200 ℃, and the calcium hexaluminate material has very high refractoriness, and when being higher than 1200 ℃ aluminium liquid is also demonstrated lower wettability.While sintering synthesis of densified calcium hexaluminate material thermal expansion coefficient (20～1200 ℃, 8.0 * 10
-6℃
-1) and Al
2O
3(corundum) is close, can be used with any ratio with corundum and can thermal expansion mismatch.Calcium hexaluminate material volume density is also moderate, approximately 3.0g/cm
3For this reason, selecting sintering synthesis of densified calcium hexaluminate material for use is main raw material, several or whole in the materials such as plate diamond spar, fused white corundum, bonding clay, quartz, kyanite, chromoxide green, zircon, the moulding of vibration extrusion forming mode, high temperature burns till, and the outside installs the stainless steel steel bushing additional during assembling.
The invention provides a kind of making method of breathable refractory materials, the breathable refractory materials that utilizes this making method to produce, even structure, the bubble that blows out by gas permeable material is little and many, aluminium liquid is difficult for infiltrating, this gas permeable material is applicable to the aluminium refinery practice flow sheet equipment of aluminium deep processing industry, promptly be applied to the insulation of aluminium liquid and leave standstill stove, chute, on the bottom and sidewall of degasification tank, can play even temperature of aluminum liquid and composition, shorten refining time, it is energy-saving and cost-reducing to improve thermo-efficiency, reduce slag, alleviate the effect of labor strength, aluminium pin hole rate obviously reduces, and effectively improves aluminium liquid quality.The present invention adopts the pressing mode moulding while vibrating, and goods are ventilative and physical and chemical performance is uniform and stable.Inner each the position structure of goods is inhomogeneous when having avoided above-mentioned traditional forming method moulding, thereby cause that each position physical and chemical performance difference of goods is big, goods Gas permeability and flow rate fluctuation be big, big and the drawback that connects of internal porosity, during the vibration extrusion forming, the material mould of packing into, be placed on the shaking platform, material top is by vibratory impulse power extrusion forming (a kind of stack of normal force of uniform motion), pressure is shaking platform vibration amplitude 3～5mm simultaneously, adjust suitable vibrational frequency and make the good fluidity of material, the material fillibility is moderate.
Aluminium liquid viscosity in the time of 750 ℃ only is 0.104Pas, and the viscosity 0.1Pas of water is quite approaching during with 20 ℃, is that it is easily to the major cause of refractory materials internal penetration.Aluminium liquid perviousness is strong, and the breathable refractory materials that leaves standstill stove and chute as molten aluminium insulation needs good permeability also can prevent the infiltration of aluminium liquid simultaneously on the one hand, wishes to obtain higher density, long service life on the other hand.Breathable refractory materials structure of the present invention has ventilation property and can stop the infiltration of aluminium liquid again.This ventilating structure is mainly by the above-mentioned raw materials used granulometric composition about the close 0.5～2mm of particle diameter, particle shape should be with the circle that is no arris edge and oval for well, to obtain the equally distributed gas-permeable channels of air flue, and these gas-permeable channels are unsuitable big, otherwise aluminium liquid easily permeates, with effective below the air flue diameter 50 μ m.
Physical and chemical index according to the breathable refractory materials that above-mentioned preparation method produced is as shown in the table:
| Physical and chemical index | Ventilative core |
| Chemical ingredients wt% Al 2O 3+ Cr 2O 3 | ≥50 |
| Volume density g/cm 3 (1500℃× 4h) | ≥2.80 |
| Cold crushing strength MPa (1500 ℃ * 4h) | ≥40 |
| High temperature break resistant intensity MPa (1400 ℃ * 1h) | ≥5 |
| Flow Nm 3/h 0.1MPa 0.4MPa | 5～30 15～75 |
Embodiment
It is as follows to provide embodiments of the invention:
Embodiment 1:
Be used to prepare the breathable refractory materials raw material and form weight ratio:
Sintering synthesis of densified calcium hexaluminate 92%, wherein particle diameter is 0.5～2mm 75%, and particle shape is the circular and oval of no arris edge, and particle diameter is 200 orders 17%;
Particle diameter is 200 order kyanites 5%;
Soft clay 3%;
Dextrin (adding) 2%;
Carboxymethyl cellulose (adding) 1%.
With the above-mentioned raw materials thorough mixing, the forming mould of packing into is placed on the vibration extrusion forming machine platform, and plus-pressure is 15 tons, shaking platform vibration in the time of pressurization, and amplitude is 3mm, time of vibration 5 seconds, last 1600 ℃ of high temperature burn till.Breathable refractory materials flow (0.3MPa) 40Nm that makes
3/ h, cold crushing strength 39Mpa.
Embodiment 2:
Be used to prepare the breathable refractory materials raw material and form weight ratio:
Sintering synthesis of densified calcium hexaluminate 67%, wherein particle diameter is 2～1mm50%200 order 17%; Particle diameter is 0.5～2mm plate diamond spar 25%;
Particle diameter is 200 order kyanites 5%;
Soft clay 3%;
Dextrin (adding) 2%;
Carboxymethyl cellulose (adding) 1%.Wherein particle diameter is that the sintering synthesis of densified calcium hexaluminate of 2～1mm and the particle shape of plate diamond spar are the circular and oval of no arris edge.
With the above-mentioned raw materials thorough mixing, the forming mould of packing into is placed on the vibration extrusion forming machine platform, 16 tons of plus-pressures, and shaking platform vibration in the time of pressurization, amplitude is 5mm, time of vibration 9 seconds, last 1500 ℃ of high temperature burn till.Breathable refractory materials flow (0.3MPa) 45Nm that makes
3/ h, cold crushing strength 49Mpa.
Embodiment 3:
Be used to prepare the breathable refractory materials raw material and form weight ratio:
Sintering synthesis of densified calcium hexaluminate 67%, wherein particle diameter is 2～1mm, 35% 1～0.5mm, 15% 200 orders 17%;
Particle diameter is 2～1mm plate diamond spar 25%;
Particle diameter is 200 order kyanites 5%;
Soft clay 3%;
Dextrin (adding) 2%;
Carboxymethyl cellulose (adding) 1%.Wherein particle diameter is that the sintering synthesis of densified calcium hexaluminate of 2～1mm and the particle shape of plate diamond spar are the circular and oval of no arris edge.
With the above-mentioned raw materials thorough mixing, the forming mould of packing into is placed on the platform of vibration pressure forming machine, pressurize 15 tons, and shaking platform vibration in the time of pressurization, amplitude is 4mm, time of vibration 10 seconds, final high temperature burns till for 1550 ℃.Breathable refractory materials flow (0.3MPa) 45Nm that makes
3/ h, cold crushing strength 49Mpa.
Embodiment 4:
Be used to prepare the breathable refractory materials raw material and form weight ratio:
Sintering synthesis of densified calcium hexaluminate 92%, wherein particle diameter is 2～1mm, 85% 200 orders 7%; Particle diameter is 200 order kyanites 5%;
Soft clay 3%;
Dextrin (adding) 2%;
Carboxymethyl cellulose (adding) 1%.Wherein particle diameter is that the sintering synthesis of densified calcium hexaluminate of 2～1mm and the particle shape of plate diamond spar are the circular and oval of no arris edge.
With the above-mentioned raw materials thorough mixing, the forming mould of packing into is placed on the platform of vibration pressure forming machine, pressurize 15 tons, and shaking platform vibration in the time of pressurization, amplitude is 5mm, time of vibration 7 seconds, last 1600 ℃ of high temperature burn till.Breathable refractory materials flow (0.3MPa) 40Nm that makes
3/ h; Cold crushing strength 32Mpa.
Embodiment 5:
Be used to prepare the breathable refractory materials raw material and form weight ratio:
Particle diameter is the sintering synthesis of densified calcium hexaluminate 75% of 1～0.5mm, and particle shape is the circular and oval of no arris edge;
Particle diameter is 200 purpose plate diamond spars 17%;
Particle diameter is 200 purpose quartz 5%;
Soft clay 3%;
Dextrin (adding) 2%;
Carboxymethyl cellulose (adding) 1%.
With the above-mentioned raw materials thorough mixing, the forming mould of packing into is placed on the platform of vibration pressure forming machine, pressurize 16 tons, and shaking platform vibration in the time of pressurization, amplitude is 4mm, time of vibration 11 seconds, final high temperature burns till for 1600 ℃.Breathable refractory materials flow (0.3MPa) 39Nm that makes
3/ h, cold crushing strength 54Mpa.
Embodiment 6:
Be used to prepare the breathable refractory materials raw material and form weight ratio:
Particle diameter is the sintering synthesis of densified calcium hexaluminate 75% of 1～0.5mm, and particle shape is the circular and oval of no arris edge;
Fused white corundum 200 orders 17%;
Quartzy 200 orders 5%;
Soft clay 3%;
Dextrin (adding) 2%;
Carboxymethyl cellulose (adding) 1%.
With the above-mentioned raw materials thorough mixing, the forming mould of packing into is placed on the platform of vibration pressure forming machine, pressurize with hydropress on material top, and shaking platform vibration in the time of pressurization, amplitude is 4mm, vibrates 10 seconds, last 1600 ℃ of high temperature burn till.Breathable refractory materials flow (0.3MPa) 39Nm that makes
3/ h, cold crushing strength 52Mpa.
Embodiment 7:
Be used to prepare the breathable refractory materials raw material and form weight ratio:
Particle diameter is 2～1mm sintering synthesis of densified calcium hexaluminate 75%, and particle shape is the circular and oval of no arris edge;
Particle diameter is 200 keevil shape corundum 14%;
Particle diameter is 200 order kyanites 5%;
Soft clay 3%;
Zircon 3%;
Dextrin (adding) 2%;
Carboxymethyl cellulose (adding) 1%.
With the above-mentioned raw materials thorough mixing, the forming mould of packing into is placed on the platform of vibration pressure forming machine, pressurize 15 tons, and shaking platform vibration in the time of pressurization, amplitude is 5mm, last 1550 ℃ of high temperature burn till.Breathable refractory materials flow (0.3MPa) 40Nm that makes
3/ h, cold crushing strength 39Mpa.
Embodiment 8:
Be used to prepare the breathable refractory materials raw material and form weight ratio:
Particle diameter is 2～1mm sintering synthesis of densified calcium hexaluminate 75%, and particle shape is the circular and oval of no arris edge;
Particle diameter is 200 keevil shape corundum 12%;
Particle diameter is 200 order kyanites 5%;
Soft clay 3%;
Chromoxide green 5%;
Dextrin (adding) 2%
Carboxymethyl cellulose (adding) 1%.
With the above-mentioned raw materials thorough mixing, the forming mould of packing into is placed on the platform of vibration pressure forming machine, pressurize 16 tons, and shaking platform vibration in the time of pressurization, amplitude is 4mm, time of vibration 9 seconds, last 1550 ℃ of high temperature burn till.Breathable refractory materials flow (0.3MPa) 40Nm that makes
3/ h, cold crushing strength 44Mpa.
Claims (5)
1, a kind of permeable fireproof materials for aluminium refining is characterized in that: being used to prepare described breathable refractory materials raw material composition weight ratio is:
Sintering synthesis of densified calcium hexaluminate 60～92%
Subsidiary material 8～30%
Add wedding agent 2.5～5.5%
Wherein, subsidiary material are several or whole in plate diamond spar, fused white corundum, soft clay, quartz, kyanite, chromic oxide and the zircon material.
2, permeable fireproof materials for aluminium refining according to claim 1 is characterized in that: the particle diameter of 60～90% in the described preparation breathable refractory materials raw material is 0.5～2mm, and particle shape is the circular and oval of no arris edge.
3, permeable fireproof materials for aluminium refining according to claim 1 is characterized in that: in the described permeable fireproof materials for aluminium refining, the content weight ratio of aluminum oxide is 50～100%.
4, permeable fireproof materials for aluminium refining according to claim 1 is characterized in that: the described wedding agent that adds is one or more of dextrin, carboxymethyl cellulose and aluminium dihydrogen phosphate.
5, the preparation method of permeable fireproof materials for aluminium refining according to claim 1, it is characterized in that: will be used to prepare described breathable refractory materials raw material and wedding agent thorough mixing, the forming mould of packing into, be placed on the shaking platform of vibration pressure forming machine, in the pressurization of material top, the pressure of pressurization is the 10-20 ton, shaking platform vibration in the time of pressurization, amplitude is 3～5mm, and time of vibration 5-15 second, last 1400-1700 ℃ of high temperature burns till.
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|---|---|---|---|
| CN 200610018089 CN1884201A (en) | 2006-07-11 | 2006-07-11 | Permeable fireproof materials for aluminium refining and process for preparing same |
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|---|---|---|---|
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| CN100467428C (en) * | 2007-06-04 | 2009-03-11 | 宜兴市国强炉业有限公司 | High temperature wear resistant paint and its production process |
| CN101928153A (en) * | 2010-09-01 | 2010-12-29 | 中国地质大学（北京） | Calcium hexaluminate and corundum composite porous light heat insulation refractory material and preparation method thereof |
| CN101428997B (en) * | 2008-12-08 | 2011-09-07 | 林国强 | High temperature abrasion-proof paint and method for producing the same |
| CN101734928B (en) * | 2009-12-24 | 2012-11-21 | 中钢集团洛阳耐火材料研究院有限公司 | Preparation method of fused silica refractory casting material unwetted by aluminum liquid |
| WO2013102288A1 (en) * | 2012-01-06 | 2013-07-11 | 淄博工陶耐火材料有限公司 | Tin bath bottom brick of aluminium, calcium and silicon, and method for preparing same |
| CN103204688A (en) * | 2013-04-11 | 2013-07-17 | 湖南华科机械有限公司 | Novel refractory material for aluminum smelting industry and preparation method of novel refractory material |
| CN107602141A (en) * | 2017-11-02 | 2018-01-19 | 武汉威林科技股份有限公司 | A kind of tundish slag wall, impact brick and preparation method thereof |
| CN107903044A (en) * | 2017-10-19 | 2018-04-13 | 淄博市鲁中耐火材料有限公司 | Low heat conduction high resistance to corrosion corundum fireproof brick and preparation method thereof |
| CN109503179A (en) * | 2018-09-18 | 2019-03-22 | 无锡市晨光耐火材料有限公司 | The Rui Kaige composite brick and preparation method thereof of fluid catalytic cracking bed reactor |
| CN109761597A (en) * | 2019-02-01 | 2019-05-17 | 无锡市晨光耐火材料有限公司 | A kind of Bo Naite composite brick and preparation method thereof |
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| CN100467428C (en) * | 2007-06-04 | 2009-03-11 | 宜兴市国强炉业有限公司 | High temperature wear resistant paint and its production process |
| CN101428997B (en) * | 2008-12-08 | 2011-09-07 | 林国强 | High temperature abrasion-proof paint and method for producing the same |
| CN101734928B (en) * | 2009-12-24 | 2012-11-21 | 中钢集团洛阳耐火材料研究院有限公司 | Preparation method of fused silica refractory casting material unwetted by aluminum liquid |
| CN101928153A (en) * | 2010-09-01 | 2010-12-29 | 中国地质大学（北京） | Calcium hexaluminate and corundum composite porous light heat insulation refractory material and preparation method thereof |
| WO2013102288A1 (en) * | 2012-01-06 | 2013-07-11 | 淄博工陶耐火材料有限公司 | Tin bath bottom brick of aluminium, calcium and silicon, and method for preparing same |
| CN103204688A (en) * | 2013-04-11 | 2013-07-17 | 湖南华科机械有限公司 | Novel refractory material for aluminum smelting industry and preparation method of novel refractory material |
| CN107903044A (en) * | 2017-10-19 | 2018-04-13 | 淄博市鲁中耐火材料有限公司 | Low heat conduction high resistance to corrosion corundum fireproof brick and preparation method thereof |
| CN107602141A (en) * | 2017-11-02 | 2018-01-19 | 武汉威林科技股份有限公司 | A kind of tundish slag wall, impact brick and preparation method thereof |
| CN109503179A (en) * | 2018-09-18 | 2019-03-22 | 无锡市晨光耐火材料有限公司 | The Rui Kaige composite brick and preparation method thereof of fluid catalytic cracking bed reactor |
| CN109761597A (en) * | 2019-02-01 | 2019-05-17 | 无锡市晨光耐火材料有限公司 | A kind of Bo Naite composite brick and preparation method thereof |
| CN112745108A (en) * | 2020-12-07 | 2021-05-04 | 北京金隅通达耐火技术有限公司 | High-density chromium corundum brick for hazardous waste disposal rotary kiln |
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