CN102010216B

CN102010216B - Aluminum-magnesium light castable and preparation method thereof

Info

Publication number: CN102010216B
Application number: CN 201010595986
Authority: CN
Inventors: 顾华志; 黄奥; 张美杰; 杜博
Original assignee: Wuhan University of Science and Engineering WUSE
Current assignee: Wuhan University of Science and Engineering WUSE
Priority date: 2010-12-20
Filing date: 2010-12-20
Publication date: 2013-06-05
Anticipated expiration: 2030-12-20
Also published as: CN102010216A

Abstract

The invention relates to an aluminum-magnesium light castable and a preparation method thereof. The technical scheme comprises the following steps: using 60 to 85 wt% of aluminum-magnesium porous ceramic particles as the skeletal material, and using 10 to 35 wt% of corundum fines, 0 to 0.3 wt% of silicon oxide micropowder, 1 to 6 wt% of magnesium oxide micropowder and 2 to 8 wt% of activated aluminum oxide micropowder as the host material; premixing 1 to 3 wt% of water reducer with the host material additionally based on the total weight of the skeletal material and the host material, adding the premixed host material into the skeletal material, and adding 8 to 20 wt% of water additionally based on the total weight of the skeletal material and the host material; and stirring uniformly, pouring, vibration-moulding, and drying the body after the moulding for 6 to 36 hours under the temperature of 110 to 150 DEG C. The product provided by the invention has the characteristics of low silicon content, is cement-free, and has high porosity, small average pore size, high fire resistance, large high temperature strength, low thermal conductivity, good thermal shock stability and strong medium erosion resistance such as the slag and the like. The castable provided by the invention can be used as the energy saving working lining material of the industrial furnace in pyrometallurgy and the like, which can contact with the medium such as the high temperature slag and the like in a long term.

Description

A kind of aluminum-magnesium light castable and preparation method thereof

Technical field

The invention belongs to the mould material technical field.Be specifically related to a kind of aluminum-magnesium light castable and preparation method thereof.

Background technology

Along with the growing and social progress of economy, energy-saving and emission-reduction become the focus that people pay close attention to.The development of light heat insulation material is developed rapidly.Aspect the lightweight amorphous refractory, vermiculite, perlite, haydite and fibre castable etc. have been developed, the thermal conductivity of comparing them is low, can be used as lagging material uses, but its high-temperature behavior is poor, and slag corrosion resistance particularly corrodes relatively poor to basic slag, can not be directly used in metallurgical position of waiting the media such as industrial furnace working lining under the high temperature environment etc. and slag directly to contact.

Heat-insulating heat-preserving material majority in modern technologies can only be used for the position that use temperature is not too high and can not directly contact with molten steel, and these have all limited the use of light material greatly.Thus, the industrial furnace working lining material such as pyrometallurgy is at present still take the heavy mould material of dense form as main.Many in view of dense form mould material resource consumption, burn till that energy consumption is large, heat dissipation capacity is larger in use procedure, is unfavorable for the development of the construction of " amphitypy society ".Someone improves on the basis of dense form heavy mould material, invented as " a kind of non-cement light alumina magnesia cast material and preparation method thereof " patented technology (CN200710052468.5), it has adopted the porous ceramics particle, guarantee workability and low temperature intensity by adding ultrafine silica powder, avoided because of take aluminous cement as wedding agent, use temperature can not too high, easily produce the poor unfavorable factor of structure spalling and slag resistance, can apply to the position that directly contacts with media such as slags.Yet, the porous ceramics particle void content that its described material adopts is high, mean pore size is large (＜30 μ m) still, energy-conservation need permeate with erosion performance as cost take the anti-slag that weakens material, and this lightening casting material such as life-time service be at the position that directly contacts with the medium such as high-temperature steel slag, must be aided with dense granule (＜20wt%) strengthen and lengthen the life.Simultaneously, the too much silicon oxide in the magnalium system can make material at high temperature produce too much liquid phase, has a strong impact on the use properties under its high temperature, has limited high purity alumina-magnesia materials'use temperature, and brings " oxygenation " significantly to molten steel.

Summary of the invention

The erosion medium resistance abilities such as a kind of silicone content is low, non-cement, void content is high, mean pore size is little, refractoriness is high, hot strength is large, thermal conductivity is low, good thermal shock stability, anti-slag that the purpose of this invention is to provide strong and can with aluminum-magnesium light castable of the direct Long Term Contact of medium such as high-temperature steel slag and preparation method thereof.

For achieving the above object, the technical solution used in the present invention is: take the aluminum-magnesium series porous ceramics particle of 60～85wt% as aggregate, take the Reactive alumina of the fine magnesium oxide micro-powder of the ultrafine silica powder of the corundum fine powder of 10～35wt%, 0～0.3wt%, 1～6wt% and 2～8wt% as substrate material; Add water reducer and the substrate material premix of 1～3wt% of aggregate and substrate material sum, again the substrate material after premix is added in aggregate, and then the water that adds 8～20wt% of aggregate and substrate material sum stirs, cast vibratory compaction, the base substrate after moulding under 110～150 ℃ of conditions dry 6～36 hours.

The apparent porosity of described aluminum-magnesium series porous ceramics particle is 30～50%, mean pore size＜10 μ m, and grain diameter is 0.15～10mm; Aluminum-magnesium series porous ceramics particle is that porous corundum ceramic, porous corundum-spinel pottery, porous spinelle are ceramic, one or more in porous square magnesium stone-spinel pottery and porous periclasite pottery.

The Al of described porous corundum ceramic ₂O ₃Content＞90wt%, the Al of porous corundum-spinel pottery ₂O ₃Content is 70～90wt%, the Al of porous spinelle pottery ₂O ₃Content is 60～70wt%, and the MgO content of porous square magnesium stone-spinel pottery is 30～60wt%, the MgO content＞90wt% of porous periclasite pottery.

Described corundum fine powder or be plate diamond spar fine powder or for the white fused alumina fine powder or be the compound of plate diamond spar fine powder and white fused alumina fine powder; The grain composition of corundum fine powder is: particle diameter is that the corundum fine powder of 150 μ m～88 μ m is 70～90wt%, and particle diameter is 10～30wt% less than the corundum fine powder of 88 μ m.

MgO content＞the 80wt% of described fine magnesium oxide micro-powder; The grain composition of fine magnesium oxide micro-powder is: particle diameter is that the fine magnesium oxide micro-powder of 88～32 μ m is 10～15wt%, and particle diameter is that the fine magnesium oxide micro-powder of 32～4 μ m is 25～35wt%, and particle diameter is 50～60wt% less than the fine magnesium oxide micro-powder of 4 μ m.

Described Reactive alumina or be active ρ-alumina powder or for active alpha-alumina powder or be the compound of active ρ-alumina powder and active alpha-alumina powder, the Al of Reactive alumina ₂O ₃Content＞99wt%; The grain composition of Reactive alumina is: particle diameter is that 88～9 μ m are 15～20wt%, and particle diameter is that 9～3 μ m are 25～30wt%, and particle diameter is 50～60wt% less than 3 μ m.

Described water reducer is one or more in tripoly phosphate sodium STPP, Sodium hexametaphosphate 99 and poly carboxylic acid series water reducer.

The SiO of described ultrafine silica powder ₂Content＞96wt%; The grain composition of ultrafine silica powder is: particle diameter is that the ultrafine silica powder of 88～7 μ m is 5～15wt%, and particle diameter is that the ultrafine silica powder of 7～1 μ m is 30～45wt%, and particle diameter is 50～60wt% less than the ultrafine silica powder of 1 μ m.

Owing to adopting technique scheme, the present invention mainly adopts the fine magnesium oxide micro-powder of low silicon non-cement and the coupling system of alumina powder, the same with ultrafine silica powder, the especially active ρ-alumina powder of Reactive alumina and fine magnesium oxide micro-powder can form chain or netted binding substances with the water reaction at normal temperatures, make mould material have middle low-temperature performance preferably, strengthen high-temperature behavior, the matrix grating of compounding ingredient makes matrix of materials partly form non-densifying many micropore energy-savings Enhanced Configuration simultaneously.Avoided the use temperature of more silicon oxide restriction high purity alumina-magnesia material and caused molten steel " oxygenation ", having prevented the oversintering of material and densification and reduce applied at elevated temperature performance and energy-saving effect.

The prepared aluminum-magnesium light castable apparent porosity of the present invention is 30～50%, mean pore size＜15 μ m, SiO ₂Content＜1wt%.Have that silicone content is low, non-cement, the strong characteristics of erosion medium resistance ability such as refractoriness is high, hot strength is large, thermal conductivity is low, good thermal shock stability and anti-slag, and because substrate material is also that optimization vesicular structure, aperture are little, not only make material thermal conductivity lower, and can in use induce and utilize in high-temperature steel slag dominant component to form highdensity calcium hexaluminate and tiny spinel two " protective layer " at material surface, possess the function of selfreparing long service life.

Thus, the strong characteristics of erosion medium resistance ability such as the prepared product of the present invention has that silicone content is low, non-cement, void content is high, mean pore size is little, refractoriness is high, hot strength is large, thermal conductivity is low, good thermal shock stability and anti-slag, be the Energy Saving for Industrial Furnace working lining materials such as pyrometallurgy, can with the direct Long Term Contacts of medium such as high-temperature steel slag.

Embodiment

The invention will be further described below in conjunction with embodiment, is not the restriction to protection domain:

For avoiding repetition, existing physical and chemical parameter unification with the involved raw material of this embodiment is described below, and repeats no more in specific embodiment:

The apparent porosity of aluminum-magnesium series porous ceramics particle is 30～50%, mean pore size＜10 μ m, and grain diameter is 0.15～10mm; Wherein: the Al of porous corundum ceramic ₂O ₃Content＞90wt%, the Al of porous corundum-spinel pottery ₂O ₃Content is 70～90wt%, the Al of porous spinelle pottery ₂O ₃Content is 60～70wt%, and the MgO content of porous square magnesium stone-spinel pottery is 30～60wt%, the MgO content＞90wt% of porous periclasite pottery.

The grain composition of corundum fine powder is: particle diameter is that the corundum fine powder of 150 μ m～88 μ m is 70～90wt%, and particle diameter is 10～30wt% less than the corundum fine powder of 88 μ m.

MgO content＞the 80wt% of fine magnesium oxide micro-powder; The grain composition of fine magnesium oxide micro-powder is: particle diameter is that the fine magnesium oxide micro-powder of 88～32 μ m is 10～15wt%, and particle diameter is that the fine magnesium oxide micro-powder of 32～4 μ m is 25～35wt%, and particle diameter is 50～60wt% less than the fine magnesium oxide micro-powder of 4 μ m.

The Al of Reactive alumina ₂O ₃Content＞99wt%; The grain composition of Reactive alumina is: particle diameter is that 88～9 μ m are 15～20wt%, and particle diameter is that 9～3 μ m are 25～30wt%, and particle diameter is 50～60wt% less than 3 μ m.

The SiO of ultrafine silica powder ₂Content＞96wt%; The grain composition of ultrafine silica powder is: particle diameter is that the ultrafine silica powder of 88～7 μ m is 5～15wt%, and particle diameter is that the ultrafine silica powder of 7～1 μ m is 30～45wt%, and particle diameter is 50～60wt% less than the ultrafine silica powder of 1 μ m.

Embodiment 1

A kind of aluminum-magnesium light castable and preparation method thereof.Take the aluminum-magnesium series porous ceramics particle of 60～75wt% as aggregate, take the Reactive alumina of the fine magnesium oxide micro-powder of the ultrafine silica powder of the corundum fine powder of 20～35wt%, 0.01～0.1wt%, 3～6wt% and 1～4wt% as substrate material; Add water reducer and the substrate material premix of 2.5～3wt% of aggregate and substrate material sum, again the substrate material after premix is added in aggregate, and then the water that adds 8～14wt% of aggregate and substrate material sum stirs, cast vibratory compaction, the base substrate after moulding under 110～130 ℃ of conditions dry 6～18 hours.

In the present embodiment: aluminum-magnesium series porous ceramics particle is the porous corundum ceramic; Corundum fine powder is the compound of plate diamond spar fine powder and white fused alumina fine powder; Reactive alumina is the compound of active ρ-alumina powder and active alpha-alumina powder; Water reducer is the mixture of tripoly phosphate sodium STPP, Sodium hexametaphosphate 99 and poly carboxylic acid series water reducer.

Embodiment 2

A kind of aluminum-magnesium light castable and preparation method thereof.Take the aluminum-magnesium series porous ceramics particle of 65～80wt% as aggregate, take the Reactive alumina of the fine magnesium oxide micro-powder of the ultrafine silica powder of the corundum fine powder of 15～30wt%, 0.1～0.2wt%, 2～5wt% and 2～5wt% as substrate material; Add water reducer and the substrate material premix of 1.5～2.5wt% of aggregate and substrate material sum, again the substrate material after premix is added in aggregate, and then the water that adds 10～16wt% of aggregate and substrate material sum stirs, cast vibratory compaction, the base substrate after moulding under 120～140 ℃ of conditions dry 12～24 hours.

In the present embodiment: aluminum-magnesium series porous ceramics particle is porous corundum ceramic and porous spinelle pottery; Corundum fine powder is the compound of plate diamond spar fine powder and white fused alumina fine powder; Reactive alumina is the compound of active ρ-alumina powder and active alpha-alumina powder; Water reducer is the mixture of tripoly phosphate sodium STPP and Sodium hexametaphosphate 99.

Embodiment 3

A kind of aluminum-magnesium light castable and preparation method thereof.Take the aluminum-magnesium series porous ceramics particle of 70～85wt% as aggregate, take the Reactive alumina of the fine magnesium oxide micro-powder of the ultrafine silica powder of the corundum fine powder of 10～25wt%, 0.2～0.3wt%, 1～4wt% and 3～6wt% as substrate material; Add water reducer and the substrate material premix of 1～2wt% of aggregate and substrate material sum, again the substrate material after premix is added in aggregate, and then the water that adds 14～20wt% of aggregate and substrate material sum stirs, cast vibratory compaction, the base substrate after moulding under 130～150 ℃ of conditions dry 18～36 hours.

In the present embodiment: aluminum-magnesium series porous ceramics particle is porous corundum ceramic, porous corundum-spinel pottery and porous spinelle pottery; Corundum fine powder is the white fused alumina fine powder; Reactive alumina is the compound of active ρ-alumina powder and active alpha-alumina powder; Water reducer is tripoly phosphate sodium STPP.

Embodiment 4

In the present embodiment: aluminum-magnesium series porous ceramics particle is porous corundum-spinel pottery; Corundum fine powder is the compound of plate diamond spar fine powder and white fused alumina fine powder; Reactive alumina is the compound of active ρ-alumina powder and active alpha-alumina powder; Water reducer is poly carboxylic acid series water reducer.

Embodiment 5

In the present embodiment: aluminum-magnesium series porous ceramics particle is porous corundum-spinel pottery, porous spinelle is ceramic and porous square magnesium stone-spinel pottery; Corundum fine powder is the plate diamond spar fine powder; Reactive alumina is the compound of active ρ-alumina powder and active alpha-alumina powder; Water reducer is the mixture of tripoly phosphate sodium STPP, Sodium hexametaphosphate 99 and poly carboxylic acid series water reducer.

Embodiment 6

In the present embodiment: aluminum-magnesium series porous ceramics particle is that porous corundum-spinel pottery, porous spinelle are ceramic, porous square magnesium stone-spinel pottery and porous periclasite pottery; Corundum fine powder is the plate diamond spar fine powder; Reactive alumina is active ρ-alumina powder; The mixture of water reducer Sodium hexametaphosphate 99 and poly carboxylic acid series water reducer.

Embodiment 7

A kind of aluminum-magnesium light castable and preparation method thereof.Take the aluminum-magnesium series porous ceramics particle of 60～75wt% as aggregate, take the Reactive alumina of the fine magnesium oxide micro-powder of the corundum fine powder of 20～35wt%, 3～6wt% and 1～4wt% as substrate material; Add water reducer and the substrate material premix of 2.5～3wt% of aggregate and substrate material sum, again the substrate material after premix is added in aggregate, and then the water that adds 8～14wt% of aggregate and substrate material sum stirs, cast vibratory compaction, the base substrate after moulding under 110～130 ℃ of conditions dry 6～18 hours.

In the present embodiment: aluminum-magnesium series porous ceramics particle is the porous spinelle pottery; Corundum fine powder is the compound of plate diamond spar fine powder and white fused alumina fine powder; Reactive alumina is the compound of active ρ-alumina powder and active alpha-alumina powder; Water reducer is the mixture of tripoly phosphate sodium STPP, Sodium hexametaphosphate 99 and poly carboxylic acid series water reducer.

Embodiment 8

In the present embodiment: aluminum-magnesium series porous ceramics particle is porous spinelle pottery and porous square magnesium stone-spinel pottery; Corundum fine powder is the compound of plate diamond spar fine powder and white fused alumina fine powder; Reactive alumina is the compound of active ρ-alumina powder and active alpha-alumina powder; Water reducer is the mixture of tripoly phosphate sodium STPP and poly carboxylic acid series water reducer.

Embodiment 9

In the present embodiment: aluminum-magnesium series porous ceramics particle is porous spinelle pottery, porous square magnesium stone-spinel pottery and porous periclasite pottery; Corundum fine powder is the white fused alumina fine powder; Reactive alumina is the compound of active ρ-alumina powder and active alpha-alumina powder; Water reducer is the mixture of tripoly phosphate sodium STPP and Sodium hexametaphosphate 99.

Embodiment 10

In the present embodiment: aluminum-magnesium series porous ceramics particle is porous square magnesium stone-spinel pottery; Corundum fine powder is the white fused alumina fine powder; Reactive alumina is the compound of active ρ-alumina powder and active alpha-alumina powder; Water reducer is poly carboxylic acid series water reducer.

Embodiment 11

In the present embodiment: aluminum-magnesium series porous ceramics particle is porous square magnesium stone-spinel pottery and porous periclasite pottery; Corundum fine powder is the white fused alumina fine powder; Reactive alumina is the compound of active ρ-alumina powder and active alpha-alumina powder; Water reducer is the mixture of tripoly phosphate sodium STPP, Sodium hexametaphosphate 99 and poly carboxylic acid series water reducer.

Embodiment 12

In the present embodiment: aluminum-magnesium series porous ceramics particle is porous corundum ceramic, porous spinelle pottery, porous square magnesium stone-spinel pottery and porous periclasite pottery; Corundum fine powder is the white fused alumina fine powder; Reactive alumina is active alpha-alumina powder; Water reducer is Sodium hexametaphosphate 99.

Embodiment 13

In the present embodiment: aluminum-magnesium series porous ceramics particle is porous periclasite pottery; Corundum fine powder is the compound of plate diamond spar fine powder and white fused alumina fine powder; Reactive alumina is the compound of active ρ-alumina powder and active alpha-alumina powder; Water reducer is poly carboxylic acid series water reducer.

Embodiment 14

In the present embodiment: aluminum-magnesium series porous ceramics particle is porous corundum ceramic and porous periclasite pottery; Corundum fine powder is the white fused alumina fine powder; Reactive alumina is the compound of active ρ-alumina powder and active alpha-alumina powder; Water reducer is the mixture of tripoly phosphate sodium STPP, Sodium hexametaphosphate 99 and poly carboxylic acid series water reducer.

Embodiment 15

In the present embodiment: aluminum-magnesium series porous ceramics particle is that porous corundum ceramic, porous corundum-spinel pottery, porous spinelle are ceramic, porous square magnesium stone-spinel pottery and porous periclasite pottery; Corundum fine powder is the plate diamond spar fine powder; Reactive alumina is the compound of active ρ-alumina powder and active alpha-alumina powder; Water reducer is poly carboxylic acid series water reducer.

This embodiment mainly adopts the fine magnesium oxide micro-powder of low silicon non-cement and the coupling system of alumina powder, the same with ultrafine silica powder, the especially active ρ-alumina powder of Reactive alumina and fine magnesium oxide micro-powder can form chain or netted binding substances with the water reaction at normal temperatures, make mould material have middle low-temperature performance preferably, strengthen high-temperature behavior, the matrix grating of compounding ingredient makes matrix of materials partly form non-densifying many micropore energy-savings Enhanced Configuration simultaneously.Avoided the use temperature of more silicon oxide restriction high purity alumina-magnesia material and caused molten steel " oxygenation ", having prevented the oversintering of material and densification and reduce applied at elevated temperature performance and energy-saving effect.

The prepared aluminum-magnesium light castable apparent porosity of this embodiment is 30～50%, mean pore size＜15 μ m, SiO ₂Content＜1wt%.Have that silicone content is low, non-cement, the strong characteristics of erosion medium resistance ability such as refractoriness is high, hot strength is large, thermal conductivity is low, good thermal shock stability and anti-slag, and because substrate material is also that optimization vesicular structure, aperture are little, not only make material thermal conductivity lower, and can in use induce and utilize in high-temperature steel slag dominant component to form highdensity calcium hexaluminate and tiny spinel two " protective layer " at material surface, possess the long-lived functionalization of selfreparing.

Claims

1. the preparation method of an aluminum-magnesium light castable, it is characterized in that aluminum-magnesium series porous ceramics particle take 60～85wt% as aggregate, take the Reactive alumina of the fine magnesium oxide micro-powder of the ultrafine silica powder of the corundum fine powder of 10～35wt%, 0～0.3wt%, 1～6wt% and 2～8wt% as substrate material; Add water reducer and the substrate material premix of 1～3wt% of aggregate and substrate material sum, again the substrate material after premix is added in aggregate, and then the water that adds 8～20wt% of aggregate and substrate material sum stirs, cast vibratory compaction, the base substrate after moulding under 110～150 ℃ of conditions dry 6～36 hours;

The apparent porosity of described aluminum-magnesium series porous ceramics particle is 30～50%, mean pore size＜10 μ m, and grain diameter is 0.15～10mm;

The MgO content of described fine magnesium oxide micro-powder〉80wt%; The grain composition of fine magnesium oxide micro-powder is: particle diameter is that the fine magnesium oxide micro-powder of 88～32 μ m is 10～15wt%, and particle diameter is that the fine magnesium oxide micro-powder of 32～4 μ m is 25～35wt%, and particle diameter is 50～60wt% less than the fine magnesium oxide micro-powder of 4 μ m;

Described Reactive alumina or be active ρ-alumina powder or for active alpha-alumina powder or be the compound of active ρ-alumina powder and active alpha-alumina powder, the Al of Reactive alumina ₂O ₃Content〉99wt%; The grain composition of Reactive alumina is: particle diameter is that 88～9 μ m are 15～20wt%, and particle diameter is that 9～3 μ m are 25～30wt%, and particle diameter is 50～60wt% less than 3 μ m;

Described corundum fine powder or be plate diamond spar fine powder or for the white fused alumina fine powder or be the compound of plate diamond spar fine powder and white fused alumina fine powder; The grain composition of corundum fine powder is: particle diameter is that the corundum fine powder of 150 μ m～88 μ m is 70～90wt%, and particle diameter is 10～30wt% less than the corundum fine powder of 88 μ m;

The SiO of described ultrafine silica powder ₂Content〉96wt%; The grain composition of ultrafine silica powder is: particle diameter is that the ultrafine silica powder of 88～7 μ m is 5～15wt%, and particle diameter is that the ultrafine silica powder of 7～1 μ m is 30～45wt%, and particle diameter is 50～60wt% less than the ultrafine silica powder of 1 μ m.

2. according to the preparation method of the described aluminum-magnesium light castable of claim l, it is characterized in that described aluminum-magnesium series porous ceramics particle is that porous corundum ceramic, porous corundum-spinel pottery, porous spinelle are ceramic, more than one in porous square magnesium stone-spinel pottery and porous periclasite pottery.

3. the preparation method of aluminum-magnesium light castable according to claim 2 is characterized in that the Al of described porous corundum ceramic ₂O ₃Content〉90wt%, the Al of porous corundum-spinel pottery ₂O ₃Content is 70～90wt%, the Al of porous spinelle pottery ₂O ₃Content is 60～70wt%, and the MgO content of porous square magnesium stone-spinel pottery is 30～60wt%, the MgO content of porous periclasite pottery〉90wt%.

4. the preparation method of aluminum-magnesium light castable according to claim 1, is characterized in that described water reducer is more than one in tripoly phosphate sodium STPP, Sodium hexametaphosphate 99 and poly carboxylic acid series water reducer.