CN108046837A - A kind of ladle castable refractory and preparation method thereof - Google Patents

A kind of ladle castable refractory and preparation method thereof Download PDF

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CN108046837A
CN108046837A CN201810091376.6A CN201810091376A CN108046837A CN 108046837 A CN108046837 A CN 108046837A CN 201810091376 A CN201810091376 A CN 201810091376A CN 108046837 A CN108046837 A CN 108046837A
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parts
grain size
castable refractory
raw materials
ladle
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黎文泰
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Abstract

The invention belongs to technical field of refractory materials, and in particular to a kind of ladle castable refractory and preparation method thereof.The castable refractory is prepared from the following raw materials in parts by weight：40 60 parts of micropore corundum aggregate, 10 30 parts of mullite, 10 20 parts of diatomite, 35 parts of attapulgite clay, 30 40 parts of cement, 15 parts of carborundum, 5 15 parts of silicon powder；The additional water-reducing agent for accounting for above-mentioned raw materials total weight 0.2 0.5% and the polypropylene fibre for accounting for above-mentioned raw materials total weight 0.03 0.1%, 1 5mm of grain size of the micropore corundum aggregate, aperture are 0.5 1.2 μm, and apparent porosity is 4 10%, 2 3.2g/cm of bulk density3.Castable refractory thermal conductivity of the present invention is low, and apparent porosity is suitable, and intensity is high, light weight, and thermal shock resistance is high.

Description

A kind of ladle castable refractory and preparation method thereof
Technical field
The invention belongs to technical field of refractory materials, and in particular to a kind of ladle castable refractory and preparation method thereof.
Background technology
Refractory material is widely used in lining material in the ladle at present, and during liquid steel refining, refractory material is easily subject to The erosion and infiltration of slag, cracking or even peeling, service life is only 1 year or so short, and existing castable refractory Thermal conductivity factor height often leads to substantial amounts of thermal loss, and liquid steel temperature declines the quality for comparatively fast, influencing steel billet.
Notification number is that the Chinese patent of CN105236995B discloses a kind of light-weight corundum-spinel pouring material and its preparation Method.Its technical solution is：Using the isometrical micropore corundum ball of 60 ~ 75wt% as aggregate, with the fused white corundum fine powder of 8 ~ 12wt%, The fused magnesite fine powder of 2 ~ 8wt%, the magnesium aluminate spinel micro mist of 2 ~ 8wt%, the α-Al of 6 ~ 12wt%2O3Micro mist, 0.5 ~ 2.5wt% The aluminium Silica hydrogel powder of chromium oxide micro mist and 3 ~ 7wt% are substrate material, and the sum of aggregate and substrate material are raw material；With the raw material 0.02 ~ The organic fiber of 0.08wt% and the polycarboxylate water-reducer of 0.05 ~ 0.12wt% are additive.First substrate material and additive are premixed, Aggregate mixing is added in, the water of the additional 3 ~ 5wt% of raw material stirs, moulding by casting, when 110 ~ 200 DEG C of heat preservations 12 ~ 48 are small, 800 ~ When 1200 DEG C of bakings 24 ~ 72 are small, light-weight corundum-spinel pouring material is made.But the patent is only with isometrical micropore corundum ball For aggregate, gained casting material strength is relatively low, and weight is big, is not convenient to use.
Notification number is that the Chinese patent of CN103693980B discloses a kind of light microporous heat insulating casting material i.e. preparation method. The invention improves the porosity of castable and makes by preparing stable fine-celled foam and adding it in castable to reach Castable inner air vent micro-nanoization.The light microporous particles of 40-70wt% be aggregate, the fine powder of 10-15wt%, the micro mist of 10-20wt% Bonding agent with 10-25wt% is matrix；Additionally incorporate the fine-celled foam of the sum of aggregate and matrix volume 30-70v% bubbles stabilization. The inventive method ensure that the characteristics of castable critical granularity is larger, and introduce a large amount of fine-celled foams, bubble diameter≤ There is the high porosity, intensity height, the low and good anti-thermal shock of thermal conductivity to stablize for 0.1mm, light microporous heat insulating casting material obtained Property, temperature in use can reach 1700 DEG C.But the patent using fine-celled foam and adds it in castable to reach raising The porosity of castable, gained stomata is unstable, and casting material strength is low.
The content of the invention
To overcome drawbacks described above, it is an object of the invention to provide a kind of ladle castable refractories and preparation method thereof.
To achieve the above object, the present invention adopts the following technical scheme that：
A kind of ladle castable refractory, is prepared from the following raw materials in parts by weight：
40-60 parts of micropore corundum aggregate, 10-30 parts of mullite, 10-20 parts of diatomite, 3-5 parts of attapulgite clay, cement 30-40 Part, 1-5 parts of carborundum, 5-15 parts of silicon powder；The additional water-reducing agent for accounting for above-mentioned raw materials total weight 0.2-0.5% and account for above-mentioned raw materials The polypropylene fibre of total weight 0.03-0.1%, the grain size 1-5mm of the micropore corundum aggregate, aperture are 0.5-1.2 μm, show gas Porosity is 4-10%, bulk density 2-3.2g/cm3。
Preferably, the micropore corundum aggregate processing method is：By 70-80 parts of γ-Al2O3Micro mist, 10-15 parts MgO micro mists, 1-3 parts of α-Al2O3Nano powder and 0.5-1 parts of CaCO3Then micro mist, ball milling add in 15-20 parts of Suzhou clays With 0.3-1 parts of water-reducing agents, 100-120 DEG C of dry 16-24h, then 1400-1600 DEG C sintering 3-6h to get.
Preferably, the γ-Al2O3The grain size of micro mist is 1-6 μm, and the grain size of the MgO micro mists is 5-9 μm, the α- Al2O3The grain size of nano powder is 200-250nm, the CaCO3The grain size of micro mist is 1-5 μm.
Preferably, the water-reducing agent is sodium tripolyphosphate, calgon or Sodium Polyacrylate.
Preferably, the mullite is M60 mullites or M70 mullites.
Preferably, grain size≤0.074mm of the carborundum.
Preferably, granularity≤0.02 μm of the silicon powder.
Preferably, granularity≤2mm of the diatomite or attapulgite clay.
Preferably, the cement is 70 cement or 925 cement.
The preparation method of above-mentioned ladle castable refractory, comprises the following steps：
（1）Various raw materials are added in mixer, mix 5-10min, then add in the water of raw material gross weight 3-8%, stirring is equal It is even；
（2）By step（1）The castable stirred evenly is injected in mold, vibration moulding, and 8-15h is kept the temperature under the conditions of 110-150 DEG C, The demoulding, obtains green body；
（3）By step（2）Green body carries out heating baking, the heating baking for first with the heating rate of 10-15 DEG C/h from room Temperature rises to 150-200 DEG C, keeps the temperature 10-15h, is then warming up to 300-500 DEG C with the heating rate of 30-50 DEG C/h, keeps the temperature 15- 22h is finally warming up to 1000-1200 DEG C with the heating rate of 15-25 DEG C/h, heat preservation 6-10h to get.
The positive beneficial effect of the present invention：
1. micropore corundum aggregate aperture of the present invention is small, apparent porosity is high, is conducive to improve castable heat-insulation and heat-preservation ability and resist molten Scouring ability, and bulk density is small, reduces castable weight, contains a small amount of SiO in mullite2Glass phase, padded coaming In stress, while coefficient of thermal expansion is conducive to improve the thermal shock resistance and high temperature break resistant intensity of castable again than relatively low, micro- Hole corundum aggregate and mullite are shared as castable aggregate, and intensity is high, light weight, and stomata is more, slag diffusion admittance compared with More, anti-thermal shock and antistrip performance are good；Diatomite of the present invention, attapulgite clay and cement are adhesive, and diatomite is loose, matter Gently, porous, chemical property is stablized, and improves the porosity of castable, and attapulgite clay good leveling property, water imbibition is strong, and when adhesional wetting has Toughness and plasticity, invention adhesives, which are sufficiently mixed, unites each raw material；Carborundum and silicon powder grain size of the present invention are small and strong Degree is high, can be filled into adhesive gap, improve the intensity of castable；Polypropylene fibre in sintering process heated combustion or Fusing, is conducive to the formation of fine pores in castable, further improves the ability that castable resists slag corrosion.The present invention Various raw materials synergistic effect, the W/m k of 1200 DEG C of thermal conductivitys≤0.63, thermal conductivity is low, high insulating effect, reduces molten steel heat damage It loses；Apparent porosity 10-12%, slag-resistant erosion performance are excellent；Bulk density≤1.7g/cm3, bulk density is small, light weight； 1200 DEG C of water cooling thermal shock resistance experiments are at least 25 times recyclable, good thermal shock stability；The MPa of cold crushing strength >=12.4, Linear shrinkage ratio≤0.9% after being heated under the conditions of 1450 DEG C of * 3h of castable, flexural strength >=7.5MPa, casting material strength are high.
2. micropore corundum aggregate of the present invention uses γ-Al2O3Micro mist, MgO micro mists, α-Al2O3Nano powder and CaCO3Micro mist It is prepared, gained micropore corundum aggregate volume density is small, light weight, apparent porosity are high.
3. castable refractory of the present invention uses the slow heating and heat preservation 10-15h of heating rate of 10-15 DEG C/h of elder generation, then The heating rate of 30-50 DEG C/h is rapidly heated 15-22h, the steady heating and heat preservation 6-10h's of heating rate of last 15-25 DEG C/h Sintering method baking molding, heating is steady, forms castable compact structure, internal aperture uniformity, gained pouring materialfor steel ladle Intensity is high.
Specific embodiment
With reference to some specific embodiments, the present invention is further described.
Embodiment 1
A kind of ladle castable refractory, is prepared from the following raw materials in parts by weight：
40 parts of micropore corundum aggregate, 10 parts of M60 mullites, 10 parts of diatomite, 3 parts of attapulgite clay, 70 30 parts of cement, carborundum 1 part, 5 parts of silicon powder；The additional water-reducing agent for accounting for above-mentioned raw materials total weight 0.2% and the polypropylene for accounting for above-mentioned raw materials total weight 0.03% Fiber, the grain size 1-5mm of the micropore corundum aggregate, aperture are 0.5-1.2 μm, apparent porosity 4-10%, bulk density 2- 3.2g/cm3。
The micropore corundum aggregate processing method is：By 70 parts of γ-Al2O3Micro mist, 12 parts of MgO micro mists, 1 part of α- Al2O3Nano powder and 0.5 part of CaCO3Then micro mist, ball milling add in 15 parts of Suzhou clays and 0.3 part of water-reducing agent, 100 DEG C dry Dry 20h, then 1400 DEG C sintering 6h to get.
γ-the Al2O3The grain size of micro mist is 1-6 μm, and the grain size of the MgO micro mists is 5-9 μm, the α-Al2O3Nanometer The grain size of powder is 200-250nm, the CaCO3The grain size of micro mist is 1-5 μm.
The water-reducing agent is sodium tripolyphosphate.
Grain size≤0.074mm of the carborundum.
Granularity≤0.02 μm of the silicon powder.
Granularity≤2mm of the diatomite or attapulgite clay.
The preparation method of above-mentioned ladle castable refractory, comprises the following steps：
（1）Above-mentioned raw materials are added in mixer, mix 5min, the water of raw material gross weight 5% is then added in, stirs evenly；
（2）By step（1）The castable stirred evenly is injected in mold, vibration moulding, and 15h is kept the temperature under the conditions of 110 DEG C, is demoulded, Obtain green body；
（3）By step（2）Green body carries out heating baking, the heating baking for first with the heating rate of 10 DEG C/h from room temperature liter To 180 DEG C, 12h is kept the temperature, is then warming up to 300 DEG C with the heating rate of 30 DEG C/h, 22h is kept the temperature, finally with the heating of 15 DEG C/h Rate is warming up to 1000 DEG C, heat preservation 10h to get.
Embodiment 2
A kind of ladle castable refractory, is prepared from the following raw materials in parts by weight：
42 parts of micropore corundum aggregate, 15 parts of M70 mullites, 13 parts of diatomite, 3.2 parts of attapulgite clay, 925 30 parts of cement, carbon 1.6 parts of SiClx, 6 parts of silicon powder；The additional water-reducing agent for accounting for above-mentioned raw materials total weight 0.2% and account for above-mentioned raw materials total weight 0.05% Polypropylene fibre, the grain size 1-5mm of the micropore corundum aggregate, aperture are 0.5-1.2 μm, apparent porosity 4-10%, and volume is close Spend 2-3.2g/cm3。
The micropore corundum aggregate processing method is：By 72 parts of γ-Al2O3Micro mist, 10 parts of MgO micro mists, 1.2 parts α-Al2O3Nano powder and 0.6 part of CaCO3Then micro mist, ball milling add in 16 parts of Suzhou clays and 0.4 part of water-reducing agent, 110 DEG C Dry 16h, then 1500 DEG C of sintering 4h to get.
γ-the Al2O3The grain size of micro mist is 1-6 μm, and the grain size of the MgO micro mists is 5-9 μm, the α-Al2O3Nanometer The grain size of powder is 200-250nm, the CaCO3The grain size of micro mist is 1-5 μm.
The water-reducing agent is calgon.
Grain size≤0.074mm of the carborundum.
Granularity≤0.02 μm of the silicon powder.
Granularity≤2mm of the diatomite or attapulgite clay.
The preparation method of above-mentioned ladle castable refractory, comprises the following steps：
（1）Above-mentioned raw materials are added in mixer, mix 6min, the water of raw material gross weight 3% is then added in, stirs evenly；
（2）By step（1）The castable stirred evenly is injected in mold, vibration moulding, and 8h is kept the temperature under the conditions of 150 DEG C, is demoulded, is obtained To green body；
（3）By step（2）Green body carries out heating baking, the heating baking for first with the heating rate of 11 DEG C/h from room temperature liter To 150 DEG C, 11h is kept the temperature, is then warming up to 300 DEG C with the heating rate of 40 DEG C/h, 16h is kept the temperature, finally with the heating of 15 DEG C/h Rate is warming up to 1100 DEG C, heat preservation 6h to get.
Embodiment 3
A kind of ladle castable refractory, is prepared from the following raw materials in parts by weight：
45 parts of micropore corundum aggregate, 16 parts of M60 mullites, 14 parts of diatomite, 4 parts of attapulgite clay, 70 31 parts of cement, carborundum 2.5 parts, 9 parts of silicon powder；The additional water-reducing agent for accounting for above-mentioned raw materials total weight 0.3% and account for poly- the third of above-mentioned raw materials total weight 0.06% Alkene fiber, the grain size 1-5mm of the micropore corundum aggregate, aperture are 0.5-1.2 μm, apparent porosity 4-10%, bulk density 2- 3.2g/cm3。
The micropore corundum aggregate processing method is：By 73 parts of γ-Al2O3Micro mist, 13 parts of MgO micro mists, 1.3 parts α-Al2O3Nano powder and 0.5 part of CaCO3Then micro mist, ball milling add in 17 parts of Suzhou clays and 0.5 part of water-reducing agent, 100 DEG C Dry 18h, then 1500 DEG C of sintering 3h to get.
γ-the Al2O3The grain size of micro mist is 1-6 μm, and the grain size of the MgO micro mists is 5-9 μm, the α-Al2O3Nanometer The grain size of powder is 200-250nm, the CaCO3The grain size of micro mist is 1-5 μm.
The water-reducing agent is Sodium Polyacrylate.
Grain size≤0.074mm of the carborundum.
Granularity≤0.02 μm of the silicon powder.
Granularity≤2mm of the diatomite or attapulgite clay.
The preparation method of above-mentioned ladle castable refractory, comprises the following steps：
（1）Above-mentioned raw materials are added in mixer, mix 6min, the water of raw material gross weight 4% is then added in, stirs evenly；
（2）By step（1）The castable stirred evenly is injected in mold, vibration moulding, and 10h is kept the temperature under the conditions of 120 DEG C, is demoulded, Obtain green body；
（3）By step（2）Green body carries out heating baking, the heating baking for first with the heating rate of 12 DEG C/h from room temperature liter To 160 DEG C, 10h is kept the temperature, is then warming up to 350 DEG C with the heating rate of 35 DEG C/h, 20h is kept the temperature, finally with the heating of 20 DEG C/h Rate is warming up to 1200 DEG C, heat preservation 8h to get.
Embodiment 4
A kind of ladle castable refractory, is prepared from the following raw materials in parts by weight：
48 parts of micropore corundum aggregate, 18 parts of M70 mullites, 15 parts of diatomite, 4.1 parts of attapulgite clay, 70 33 parts of cement, carbonization 2.7 parts of silicon, 10 parts of silicon powder；The additional water-reducing agent for accounting for above-mentioned raw materials total weight 0.35% and account for above-mentioned raw materials total weight 0.06% Polypropylene fibre, the grain size 1-5mm of the micropore corundum aggregate, aperture are 0.5-1.2 μm, apparent porosity 4-10%, and volume is close Spend 2-3.2g/cm3。
The micropore corundum aggregate processing method is：By 74 parts of γ-Al2O3Micro mist, 14 parts of MgO micro mists, 1.5 parts α-Al2O3Nano powder and 0.6 part of CaCO3Then micro mist, ball milling add in 18 parts of Suzhou clays and 0.6 part of water-reducing agent, 100 DEG C Dry 20h, then 1600 DEG C of sintering 5h to get.
γ-the Al2O3The grain size of micro mist is 1-6 μm, and the grain size of the MgO micro mists is 5-9 μm, the α-Al2O3Nanometer The grain size of powder is 200-250nm, the CaCO3The grain size of micro mist is 1-5 μm.
The water-reducing agent is sodium tripolyphosphate.
Grain size≤0.074mm of the carborundum.
Granularity≤0.02 μm of the silicon powder.
Granularity≤2mm of the diatomite or attapulgite clay.
The preparation method of above-mentioned ladle castable refractory, comprises the following steps：
（1）Above-mentioned raw materials are added in mixer, mix 7min, the water of raw material gross weight 5% is then added in, stirs evenly；
（2）By step（1）The castable stirred evenly is injected in mold, vibration moulding, and 9h is kept the temperature under the conditions of 120 DEG C, is demoulded, is obtained To green body；
（3）By step（2）Green body carries out heating baking, the heating baking for first with the heating rate of 13 DEG C/h from room temperature liter To 170 DEG C, 12h is kept the temperature, is then warming up to 400 DEG C with the heating rate of 40 DEG C/h, 15h is kept the temperature, finally with the heating of 20 DEG C/h Rate is warming up to 1000 DEG C, heat preservation 8h to get.
Embodiment 5
A kind of ladle castable refractory, is prepared from the following raw materials in parts by weight：
50 parts of micropore corundum aggregate, 20 parts of M70 mullites, 15 parts of diatomite, 4.3 parts of attapulgite clay, 925 35 parts of cement, carbon 3 parts of SiClx, 12 parts of silicon powder；The additional water-reducing agent for accounting for above-mentioned raw materials total weight 0.4% and account for above-mentioned raw materials total weight 0.08% Polypropylene fibre, the grain size 1-5mm of the micropore corundum aggregate, aperture are 0.5-1.2 μm, apparent porosity 4-10%, and volume is close Spend 2-3.2g/cm3。
The micropore corundum aggregate processing method is：By 75 parts of γ-Al2O3Micro mist, 14 parts of MgO micro mists, 2 parts of α- Al2O3Nano powder and 0.7 part of CaCO3Then micro mist, ball milling add in 16 parts of Suzhou clays and 0.6 part of water-reducing agent, 110 DEG C dry Dry 20h, then 1600 DEG C sintering 4h to get.
γ-the Al2O3The grain size of micro mist is 1-6 μm, and the grain size of the MgO micro mists is 5-9 μm, the α-Al2O3Nanometer The grain size of powder is 200-250nm, the CaCO3The grain size of micro mist is 1-5 μm.
The water-reducing agent is Sodium Polyacrylate.
Grain size≤0.074mm of the carborundum.
Granularity≤0.02 μm of the silicon powder.
Granularity≤2mm of the diatomite or attapulgite clay.
The preparation method of above-mentioned ladle castable refractory, comprises the following steps：
（1）Above-mentioned raw materials are added in mixer, mix 7min, the water of raw material gross weight 5% is then added in, stirs evenly；
（2）By step（1）The castable stirred evenly is injected in mold, vibration moulding, and 10h is kept the temperature under the conditions of 130 DEG C, is demoulded, Obtain green body；
（3）By step（2）Green body carries out heating baking, the heating baking for first with the heating rate of 13 DEG C/h from room temperature liter To 180 DEG C, 13h is kept the temperature, is then warming up to 400 DEG C with the heating rate of 40 DEG C/h, 18h is kept the temperature, finally with the heating of 20 DEG C/h Rate is warming up to 1200 DEG C, heat preservation 9h to get.
Embodiment 6
A kind of ladle castable refractory, is prepared from the following raw materials in parts by weight：
51 parts of micropore corundum aggregate, 23 parts of M60 mullites, 16 parts of diatomite, 4.5 parts of attapulgite clay, 70 36 parts of cement, carbonization 3.3 parts of silicon, 13 parts of silicon powder；The additional water-reducing agent for accounting for above-mentioned raw materials total weight 0.4% and account for above-mentioned raw materials total weight 0.08% Polypropylene fibre, the grain size 1-5mm of the micropore corundum aggregate, aperture are 0.5-1.2 μm, apparent porosity 4-10%, and volume is close Spend 2-3.2g/cm3。
The micropore corundum aggregate processing method is：By 78 parts of γ-Al2O3Micro mist, 13 parts of MgO micro mists, 2.1 parts α-Al2O3Nano powder and 0.7 part of CaCO3Then micro mist, ball milling add in 18 parts of Suzhou clays and 0.7 part of water-reducing agent, 110 DEG C Dry 21h, then 1500 DEG C of sintering 5h to get.
γ-the Al2O3The grain size of micro mist is 1-6 μm, and the grain size of the MgO micro mists is 5-9 μm, the α-Al2O3Nanometer The grain size of powder is 200-250nm, the CaCO3The grain size of micro mist is 1-5 μm.
The water-reducing agent is calgon.
Grain size≤0.074mm of the carborundum.
Granularity≤0.02 μm of the silicon powder.
Granularity≤2mm of the diatomite or attapulgite clay.
The preparation method of above-mentioned ladle castable refractory, comprises the following steps：
（1）Above-mentioned raw materials are added in mixer, mix 8min, the water of raw material gross weight 6% is then added in, stirs evenly；
（2）By step（1）The castable stirred evenly is injected in mold, vibration moulding, and 12h is kept the temperature under the conditions of 130 DEG C, is demoulded, Obtain green body；
（3）By step（2）Green body carries out heating baking, the heating baking for first with the heating rate of 14 DEG C/h from room temperature liter To 180 DEG C, 13h is kept the temperature, is then warming up to 450 DEG C with the heating rate of 40 DEG C/h, 20h is kept the temperature, finally with the heating of 25 DEG C/h Rate is warming up to 1100 DEG C, heat preservation 9h to get.
Embodiment 7
A kind of ladle castable refractory, is prepared from the following raw materials in parts by weight：
56 parts of micropore corundum aggregate, 28 parts of M70 mullites, 19 parts of diatomite, 4.7 parts of attapulgite clay, 925 39 parts of cement, carbon 4 parts of SiClx, 14 parts of silicon powder；The additional water-reducing agent for accounting for above-mentioned raw materials total weight 0.45% and account for above-mentioned raw materials total weight 0.09% Polypropylene fibre, the grain size 1-5mm of the micropore corundum aggregate, aperture are 0.5-1.2 μm, apparent porosity 4-10%, and volume is close Spend 2-3.2g/cm3。
The micropore corundum aggregate processing method is：By 79 parts of γ-Al2O3Micro mist, 15 parts of MgO micro mists, 2.2 parts α-Al2O3Nano powder and 0.8 part of CaCO3Then micro mist, ball milling add in 19 parts of Suzhou clays and 0.8 part of water-reducing agent, 120 DEG C Dry 22h, then 1400 DEG C of sintering 6h to get.
γ-the Al2O3The grain size of micro mist is 1-6 μm, and the grain size of the MgO micro mists is 5-9 μm, the α-Al2O3Nanometer The grain size of powder is 200-250nm, the CaCO3The grain size of micro mist is 1-5 μm.
The water-reducing agent is sodium tripolyphosphate.
Grain size≤0.074mm of the carborundum.
Granularity≤0.02 μm of the silicon powder.
Granularity≤2mm of the diatomite or attapulgite clay.
The preparation method of above-mentioned ladle castable refractory, comprises the following steps：
（1）Above-mentioned raw materials are added in mixer, mix 9min, the water of raw material gross weight 7% is then added in, stirs evenly；
（2）By step（1）The castable stirred evenly is injected in mold, vibration moulding, and 14h is kept the temperature under the conditions of 120 DEG C, is demoulded, Obtain green body；
（3）By step（2）Green body carries out heating baking, the heating baking for first with the heating rate of 14 DEG C/h from room temperature liter To 190 DEG C, 14h is kept the temperature, is then warming up to 480 DEG C with the heating rate of 45 DEG C/h, 21h is kept the temperature, finally with the heating of 25 DEG C/h Rate is warming up to 1100 DEG C, heat preservation 10h to get.
Embodiment 8
A kind of ladle castable refractory, is prepared from the following raw materials in parts by weight：
60 parts of micropore corundum aggregate, 30 parts of M60 mullites, 20 parts of diatomite, 5 parts of attapulgite clay, 925 40 parts of cement, carbonization 5 parts of silicon, 15 parts of silicon powder；The additional water-reducing agent for accounting for above-mentioned raw materials total weight 0.5% and account for poly- the third of above-mentioned raw materials total weight 0.1% Alkene fiber, the grain size 1-5mm of the micropore corundum aggregate, aperture are 0.5-1.2 μm, apparent porosity 4-10%, bulk density 2- 3.2g/cm3。
The micropore corundum aggregate processing method is：By 80 parts of γ-Al2O3Micro mist, 15 parts of MgO micro mists, 3 parts of α- Al2O3Nano powder and 1 part of CaCO3Then micro mist, ball milling add in 20 parts of Suzhou clays and 1 part of water-reducing agent, 120 DEG C of dryings For 24 hours, then 1600 DEG C sintering 3h to get.
γ-the Al2O3The grain size of micro mist is 1-6 μm, and the grain size of the MgO micro mists is 5-9 μm, the α-Al2O3Nanometer The grain size of powder is 200-250nm, the CaCO3The grain size of micro mist is 1-5 μm.
The water-reducing agent is calgon.
Grain size≤0.074mm of the carborundum.
Granularity≤0.02 μm of the silicon powder.
Granularity≤2mm of the diatomite or attapulgite clay.
The preparation method of above-mentioned ladle castable refractory, comprises the following steps：
（1）Above-mentioned raw materials are added in mixer, mix 10min, the water of raw material gross weight 8% is then added in, stirs evenly；
（2）By step（1）The castable stirred evenly is injected in mold, vibration moulding, and 10h is kept the temperature under the conditions of 150 DEG C, is demoulded, Obtain green body；
（3）By step（2）Green body carries out heating baking, the heating baking for first with the heating rate of 15 DEG C/h from room temperature liter To 200 DEG C, 15h is kept the temperature, is then warming up to 500 DEG C with the heating rate of 50 DEG C/h, 22h is kept the temperature, finally with the heating of 20 DEG C/h Rate is warming up to 1000 DEG C, heat preservation 10h to get.
Comparative example 1
The present embodiment ladle castable refractory is substantially the same manner as Example 5, the difference is that：
A kind of ladle castable refractory, is prepared from the following raw materials in parts by weight：
50 parts of plate diamond spar aggregate, 20 parts of M70 mullites, 15 parts of diatomite, 4.3 parts of attapulgite clay, 925 35 parts of cement, carbon 3 parts of SiClx, 12 parts of silicon powder；The additional water-reducing agent for accounting for above-mentioned raw materials total weight 0.4% and account for above-mentioned raw materials total weight 0.08% Polypropylene fibre, the granularity of the plate diamond spar aggregate are 0.075~4 mm, apparent porosity 2.8%, bulk density 3.6g/ cm3。
Comparative example 2
The present embodiment ladle castable refractory is substantially the same manner as Example 5, the difference is that：
A kind of ladle castable refractory, is prepared from the following raw materials in parts by weight：
70 parts of micropore corundum aggregate, 15 parts of diatomite, 4.3 parts of attapulgite clay, 925 35 parts of cement, 3 parts of carborundum, silicon powder 12 parts, the additional water-reducing agent for accounting for above-mentioned raw materials total weight 0.4% and the polypropylene fibre for accounting for above-mentioned raw materials total weight 0.08% are described The grain size 1-5mm of micropore corundum aggregate, aperture are 0.5-1.2 μm, apparent porosity 4-10%, bulk density 2-3.2g/cm3。
Comparative example 3
The present embodiment ladle castable refractory is substantially the same manner as Example 5, the difference is that：
A kind of ladle castable refractory, is prepared from the following raw materials in parts by weight：
50 parts of micropore corundum aggregate, 20 parts of M70 mullites, 19.3 parts of diatomite, 925 35 parts of cement, 3 parts of carborundum, silicon powder 12 parts；The additional water-reducing agent for accounting for above-mentioned raw materials total weight 0.4% and the polypropylene fibre for accounting for above-mentioned raw materials total weight 0.08%, it is described The grain size 1-5mm of micropore corundum aggregate, aperture are 0.5-1.2 μm, apparent porosity 4-10%, bulk density 2-3.2g/cm3。
Comparative example 4
The present embodiment ladle castable refractory is substantially the same manner as Example 5, the difference is that：
A kind of ladle castable refractory, is prepared from the following raw materials in parts by weight：
50 parts of micropore corundum aggregate, 20 parts of M70 mullites, 19.3 parts of attapulgite clay, 925 35 parts of cement, 3 parts of carborundum, silicon 12 parts of micro mist；The additional water-reducing agent for accounting for above-mentioned raw materials total weight 0.4% and the polypropylene fibre for accounting for above-mentioned raw materials total weight 0.08%, The grain size 1-5mm of the micropore corundum aggregate, aperture are 0.5-1.2 μm, apparent porosity 4-10%, bulk density 2-3.2g/ cm3。
Comparative example 5
The present embodiment ladle castable refractory is substantially the same manner as Example 5, the difference is that：
A kind of ladle castable refractory, is prepared from the following raw materials in parts by weight：
50 parts of micropore corundum aggregate, 20 parts of M70 mullites, 15 parts of diatomite, 4.3 parts of attapulgite clay, 925 35 parts of cement；Outside Add the water-reducing agent for accounting for above-mentioned raw materials total weight 0.4% and the polypropylene fibre for accounting for above-mentioned raw materials total weight 0.08%, the micropore is firm The grain size 1-5mm of beautiful aggregate, aperture are 0.5-1.2 μm, apparent porosity 4-10%, bulk density 2-3.2g/cm3。
Performance detection is carried out to above-described embodiment 1-8 and comparative example 1-5 castable refractories, the results are shown in Table 1.
The performance test results of 1 1-8 of the embodiment of the present invention of table and comparative example 1-5 castable refractories
As shown in Table 1, micropore corundum aggregate is replaced by plate diamond spar by comparative example 1, and comparative example 2 is omitted M70 and do not come Stone, comparative example 3 omit attapulgite clay, and comparative example 4 omits diatomite, and comparative example 5 omits carborundum and silicon Micro mist, compared with comparative example 1-5 castable refractories, 1200 DEG C of thermal conductivitys of 1-8 of embodiment of the present invention castable refractories≤ 0.63 W/m k, thermal conductivity is low, high insulating effect, reduces molten steel thermal loss；Apparent porosity 10-12%, slag-resistant erosion performance It is excellent；Bulk density≤1.7g/cm3, bulk density is small, light weight；1200 DEG C of water cooling thermal shock resistance experiments are recycled to It is 25 times few, good thermal shock stability；Linear shrinkage after being heated under the conditions of cold crushing strength >=12.4 MPa, 1450 DEG C of * 3h of castable Rate≤0.9%, flexural strength >=7.5MPa, casting material strength are high.

Claims (10)

1. a kind of ladle castable refractory, which is characterized in that be prepared from the following raw materials in parts by weight：
40-60 parts of micropore corundum aggregate, 10-30 parts of mullite, 10-20 parts of diatomite, 3-5 parts of attapulgite clay, cement 30-40 Part, 1-5 parts of carborundum, 5-15 parts of silicon powder；The additional water-reducing agent for accounting for above-mentioned raw materials total weight 0.2-0.5% and account for above-mentioned raw materials The polypropylene fibre of total weight 0.03-0.1%, the grain size 1-5mm of the micropore corundum aggregate, aperture are 0.5-1.2 μm, show gas Porosity is 4-10%, bulk density 2-3.2g/cm3。
2. ladle castable refractory according to claim 1, which is characterized in that the micropore corundum aggregate processing side Method is：By 70-80 parts of γ-Al2O3Micro mist, 10-15 parts of MgO micro mists, 1-3 parts of α-Al2O3Nano powder and 0.5-1 parts of CaCO3 Then micro mist, ball milling add in 15-20 parts of Suzhou clays and 0.3-1 parts of water-reducing agents, 100-120 DEG C of dry 16-24h, then 1400-1600 DEG C sintering 3-6h to get.
3. ladle castable refractory according to claim 2, which is characterized in that the γ-Al2O3The grain size of micro mist is 1-6 μm, the grain size of the MgO micro mists is 5-9 μm, the α-Al2O3The grain size of nano powder is 200-250nm, the CaCO3It is micro- The grain size of powder is 1-5 μm.
4. according to ladle castable refractory described in claims 1 or 2, which is characterized in that the water-reducing agent is trimerization phosphorus Sour sodium, calgon or Sodium Polyacrylate.
5. ladle castable refractory according to claim 1, which is characterized in that the mullite for M60 mullites or Person's M70 mullites.
6. ladle castable refractory according to claim 1, which is characterized in that the grain size of the carborundum≤ 0.074mm。
7. ladle castable refractory according to claim 1, which is characterized in that the μ of the granularity of the silicon powder≤0.02 m。
8. ladle castable refractory according to claim 1, which is characterized in that the diatomite or attapulgite clay Granularity≤2mm.
9. ladle castable refractory according to claim 1, which is characterized in that the cement is 70 cement or 925 Cement.
10. a kind of preparation method of ladle castable refractory described in claim 1, which is characterized in that comprise the following steps：
（1）Various raw materials are added in mixer, mix 5-10min, then add in the water of raw material gross weight 3-8%, stirring is equal It is even；
（2）By step（1）The castable stirred evenly is injected in mold, vibration moulding, and 8-15h is kept the temperature under the conditions of 110-150 DEG C, The demoulding, obtains green body；
（3）By step（2）Green body carries out heating baking, the heating baking for first with the heating rate of 10-15 DEG C/h from room Temperature rises to 150-200 DEG C, keeps the temperature 10-15h, is then warming up to 300-500 DEG C with the heating rate of 30-50 DEG C/h, keeps the temperature 15- 22h is finally warming up to 1000-1200 DEG C with the heating rate of 15-25 DEG C/h, heat preservation 6-10h to get.
CN201810091376.6A 2018-01-30 2018-01-30 A kind of ladle castable refractory and preparation method thereof Pending CN108046837A (en)

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CN111689765A (en) * 2020-05-29 2020-09-22 芜湖市容川机电科技股份有限公司 Preparation method of casting ladle for casting
CN114538904A (en) * 2022-01-12 2022-05-27 安徽瑞泰新材料科技有限公司 Refractory castable for large-scale blast furnace pouring channel
CN114656264A (en) * 2022-02-10 2022-06-24 安徽宁火新材料有限公司 High-strength castable for salt bath quenching furnace

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