CN106518139A - Preparation method for heat-insulating refractory brick - Google Patents

Preparation method for heat-insulating refractory brick Download PDF

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CN106518139A
CN106518139A CN201610929987.4A CN201610929987A CN106518139A CN 106518139 A CN106518139 A CN 106518139A CN 201610929987 A CN201610929987 A CN 201610929987A CN 106518139 A CN106518139 A CN 106518139A
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cooled
warming
temperature
foaming agent
preparation
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CN106518139B (en
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周明凯
葛雪祥
王怀德
沙惠萍
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Wuhan University of Technology WUT
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Abstract

The invention discloses a preparation method for a heat-insulating refractory brick. The preparation method comprises the steps that a high-temperature foaming agent is added into a base material, mixed grindingis conducted till passing a 250-mesh standard screen, and a batch is obtained, wherein the high-temperature foaming agent is two or more of CaCO3, SiC, CaSO4 and BaCO3; the batch is laid and stacked in a mold, put into a high-temperature furnace, heated up to 1000 DEG C at 5-10 DEG C/min and then heated up to 1300 DEG C-1450 DEG C at 2-5 DEG C/min, and heat preservation is conducted for 1-2 h; and the treated batch is cooled to 900 DEG C-1000 DEG C at 5-7 DEG C/min, subjected to heat preservation for 2-3.5 h at the temperature of 900 DEG C-1000 DEG C, then cooled to 500 DEG C at 1-2 DEG C/min and cooled to be lower than 50 DEG C at 2-4 DEG C/min finally, and the mold is dismantled, so that the heat-insulating refractory brick is obtained. By means of a segmented control cooling method, the internal temperature of the prepared heat-insulating refractory brick is equally distributed, the temperature stress is small, the finished product yield is larger than 85%, and heat preservation is conducted at the temperature of 900 DEG C-1000 DEG C, so that recrystallization of a glass body in the material is facilitated, the crystalline phase content in the product is larger than 80%, and the compressive strength and the refractoriness of the material are significantly improved.

Description

A kind of preparation method of insulating fire brick
Technical field
The invention belongs to flame-proof thermal insulation material preparing technical field, and in particular to a kind of preparation method of insulating fire brick.
Background technology
Light heat-insulating fire resistant brick is that a kind of porosity height, little bulk density, thermal conductivity factor and thermal capacity are low, and is had certain The heat insulating refractory material of compressive resistance.Industrial Stoves masonry accumulation of heat loss and body of heater surface heat radiating loss, typically account for fuel and disappear The 24～45% of consumption, make the material of furnace binding with light-weight refractory insulating brick, not only can save energy, mitigate body of heater deadweight, letter Change furnace construction, reduce operating ambient temperature and improve working conditions.And due to the reduction of amount of stored heat, it is capable of achieving the quick of kiln Gentle cooling is risen, the production efficiency of kiln is improve.
Light thermal-shield refractory product is broadly divided into cellular, threadiness, granular, and wherein porous heat-insulating refractory brick is current One of most important fireclay insulating refractory, can be divided into low temperature light-weight brick (using 600～900 DEG C of temperature), middle temperature by using temperature Light-weight brick (using 900～1200 DEG C of temperature), high temperature light-weight brick (use temperature>1200℃).At present, porous light insulating refractory The preparation method of brick mainly includes：Pre-buried filler burns out method, foam method, chemical blowing process, template.
It is to add a number of combustible or sublimate in dispensing that pre-buried filler burns out method, such as wood chip, coal dust, Jiao Charcoal and polystyrene etc., burn in sintering process and lose and introduce pore.Its master as current porous light fireclay insulating refractory The mode of production is wanted, though process is simple, there is also problems in formed product and sintering process.First, some burnout materials With certain elasticity, when to pug spinning, their compressive deformations, bounce-back after pressure is removed cause base substrate loose, or even cracking Deformation.And when shaping is poured, light filling thing (such as polystyrene spheres) easily floats and causes product gas cell distribution uneven.Secondly, Assign Porous materials not by completely burnout when, easily reduce the product porosity and simultaneously cause " evil mind ".It is therefore desirable to strictly control Strong oxdiative Firing atmosphere.Finally, can burnout substances addition be the important parameter for determining the porosity, bulk density and thermal conductivity factor, and add Enter that amount is too high to cause excessive contraction, product size is wayward or even cracking.Therefore, burn out method with pre-buried filler to be difficult to Manufacture high porosity, the fireclay insulating refractory of low bulk density, and product thermal conductivity factor higher (0.3～0.4W/ (m K)).Together When, by foam solution is blended with slurry, the foam method of pore is produced using the bubble for stably having been formed, though volume can be produced The little insulating product of density, but the drying of its semi-finished product is more complicated, long the production cycle, it is relatively costly and product strength is low.
In 101698614 A of patent of invention CN《Ultramicropore high-intensity heat insulation refractory bricks and its manufacture method》Disclose A kind of method that utilization chemical blowing process prepares heat insulation refractory bricks, by foaming agent and water are mixed foam, mixes In the pasty state material be modulated into sial system grog refractory, binding agent by flyash or floating bead, then by moulding by casting, dry burning Into the fireproof insulation brick for preparing high intensity.Though the method can produce the insulating fire brick of low bulk density, compared to high temperature Foaming, its wet moulding mode bring that drying cost is high, long the production cycle, are dried, burn till the stage easily cracking etc. is many and lack Point.
The content of the invention
Present invention aim at a kind of preparation method of insulating fire brick is provided, by adding different decomposition by a certain percentage The high-temperature foaming agent of temperature is simultaneously calcined at high temperature, makes the insulating fire brick of ultralight, high-strength, low heat conduction.
It is to reach above-mentioned purpose, as follows using technical scheme：
A kind of preparation method of insulating fire brick, comprises the following steps：
1) in basestocks high-temperature foaming agent, combined grinding is added to obtain batch to 250 mesh standard sieves are crossed；High temperature is sent out Infusion is CaCO3、SiC、CaSO4、BaCO3In any 2 kinds or mixing of more than two kinds；
2) batch is spread into heap in mould, be placed in high temperature furnace, 1000 DEG C be warming up to 5～10 DEG C/min, then 2～5 DEG C/ Min is warming up to 1300 DEG C～1450 DEG C, is incubated 1～2h；
3) 900～1000 DEG C are cooled to 5～7 DEG C/min, and 2～3.5h are incubated at 900～1000 DEG C, then with 1～2 DEG C/min is cooled to 500 DEG C, finally it is cooled to 2～4 DEG C/min<50 DEG C, remove mould and obtain insulating fire brick.
By such scheme, the chemical composition range that basestocks are included is Al2O3：35～48wt%, SiO2：35～55wt%, CaO+MgO：4～15wt%, Na2O+K2O：1～5wt%, Fe2O3：0.1～3wt%.
By such scheme, mass ratio shared by high-temperature foaming agent is 0.1～1.0wt%, foaming agent average grain diameter respectively less than 13 μ M, purity are all higher than 98%.
By such scheme, high-temperature foaming agent is SiC and CaSO4Mass ratio 2:1 mixing；Batch is placed in high temperature furnace, 1000 DEG C are warming up to the heating rate of 8 DEG C/min, then 1320 DEG C are warming up to the heating rate of 2 DEG C/min, at 1320 DEG C Insulation 1h；900 DEG C are cooled to 5 DEG C/min, 3h are incubated at 900 DEG C, then are cooled to 500 DEG C with 1 DEG C/min, finally with 2 DEG C/ Min is cooled to 50 DEG C.
By such scheme, high-temperature foaming agent is SiC and BaCO3Mass ratio 1:3 mixing；Batch is placed in high temperature furnace, 1000 DEG C are warming up to the heating rate of 10 DEG C/min, then 1400 DEG C are warming up to the heating rate of 4 DEG C/min, at 1400 DEG C Insulation 2h；Finally be cooled to 980 DEG C with 5 DEG C/min, be incubated 2.5h at 980 DEG C, then be cooled to 500 DEG C with 1 DEG C/min, finally with 2 DEG C/min is cooled to 50 DEG C.
By such scheme, high-temperature foaming agent is CaCO3, SiC and BaCO3Mass ratio 1:3:2 mixing；Batch is placed in height In warm stove, 1000 DEG C are warming up to the heating rate of 5 DEG C/min, be then warming up to 1360 DEG C with the heating rate of 4 DEG C/min, 1360 DEG C of insulation 1.5h, are finally cooled to 980 DEG C with 5 DEG C/min, are incubated 2.5h at 980 DEG C, then are cooled to 500 with 1 DEG C/min DEG C, finally 50 DEG C are cooled to 2 DEG C/min.
By such scheme, high-temperature foaming agent is SiC, CaSO4And BaCO3Mass ratio 2:1:3 mixing；Batch is placed in height In warm stove, 1000 DEG C are warming up to the heating rate of 8 DEG C/min, be then warming up to 1420 DEG C with the heating rate of 3 DEG C/min, 1420 DEG C of insulation 2h, are finally cooled to 980 DEG C with 5 DEG C/min, are incubated 2.5h at 980 DEG C, then are cooled to 500 DEG C with 1 DEG C/min, Finally 50 DEG C are cooled to 2 DEG C/min.
By such scheme, high-temperature foaming agent is SiC, CaSO4And BaCO3Mass ratio 1:1:2 mixing；Batch is placed in height In warm stove, 1000 DEG C are warming up to the heating rate of 10 DEG C/min, be then warming up to 1450 DEG C with the heating rate of 2 DEG C/min, 1.5h is incubated at 1450 DEG C, finally 980 DEG C is cooled to 7 DEG C/min, be incubated 2.5h at 980 DEG C, then be cooled to 1 DEG C/min 500 DEG C, finally 50 DEG C are cooled to 2 DEG C/min.
Different from the high temperature foaming that common porous ceramic is used, this method utilizes CaCO3(decomposition temperature 800～950 DEG C), SiC (1000～1200 DEG C of decomposition temperature), BaCO3(1250～1350 DEG C of decomposition temperature), CaSO4(decomposition temperature 1150～ 1280 DEG C) composite foamable agent that constitutes, by under high temperature by single foaming agent reduce foaming be improved to composite foamable agent point Section oxidation and decomposition, make the nucleation process of pore be advanced to sintering temperature, so that the segmentation of pore nucleation and growth is carried out, are burning Into when base substrate not necessarily form.Meanwhile, nothing is realized by controlling cooling The heavy crystallization of sizing glass phase, compared to regular-type foam ceramics, its fire resisting crystalline phase amount is higher, and which uses temperature up to 1200 DEG C.
The present invention is had the beneficial effect that relative to prior art：
Directly mixed with the dry method of raw material by high-temperature foaming agent, at high temperature using micro high-temperature foaming agent oxidation or Decompose the gas for producing, hole of holding one's breath is formed in base substrate is softened, the lighting of refractory material is realized.Its preparation process is simple, Production cycle is shorter, and low production cost, article construction are controllable.
The method of Discrete control cooling makes the insulating fire brick interior temperature distribution of preparation uniformly, and temperature stress is less, produces Product yield rate is more than 85%, and is incubated at 900～1000 DEG C, promotes the heavy crystallization of vitreum in material, crystal content in product More than 80%.
Realize the preparation of ultralight high-strength heat-insulating refractory material, and compared with preparing the pre-buried filling of light thermal-shield refractory material Thing burns out method, and its preparation process is simple, small product size density are little, and porosity of holding one's breath is high, and thermal conductivity factor is lower, and has preferably resistance to Mill property and intensity.
The insulating fire brick of preparation, bulk density<500kg/m3, 350 DEG C of ± 25 DEG C of thermal conductivity factors<0.22w/ (m k), 4～10MPa of intensity.
Specific embodiment
Following examples further explain technical scheme, but not as limiting the scope of the invention.
Embodiment 1
A kind of method that high temperature foam process prepares insulating fire brick, its raw material chemical composition is by mass percentage such as Under：
The raw material composition of 1 insulating fire brick 1 of table
Above insulating fire brick raw material is mixed the high-temperature foaming agent for accounting for material quality fraction 0.8%, its high temperature foams Agent is SiC and CaSO4Mass ratio 2:1 ratio mixing.And carry out in accordance with the following steps：
(1) raw material is put in ceramic ball mill according to the above ratio, dry method mix grinding 6h took out 250 mesh sieves, and took minus sieve Material；
(2) powder obtained by step (1) is uniformly filled in porzite flame-proof mould, and is completely cut off with ceramic fiber paper, Surface paving heap is smooth；
(3) mould for being covered with ceramic batch is sent in high temperature furnace, 1000 DEG C are warming up to the heating rate of 8 DEG C/min, Then 1320 DEG C are warming up to the heating rate of 2 DEG C/min, 1h is incubated at 1320 DEG C；
(4) 900 DEG C are cooled to 5 DEG C/min, 3h is incubated at 900 DEG C, then is cooled to 500 DEG C with 1 DEG C/min, finally with 2 DEG C/min is cooled to 50 DEG C, fireproof die is taken out and removed, standard refractory brick is cut into.
Finally, the insulating fire brick unit weight produced is 360kg/m3, cold crushing strength is 4.5MPa, and 1050 DEG C are heated Permanent Linear change rate 1.9%, 350 DEG C of ± 25 DEG C of thermal conductivity factor 0.15W/ (m K).
Embodiment 2
On the basis of embodiment 1, using the raw material of another kind of composition, its raw material chemical composition is by mass percentage such as Under：
The raw material composition of 2 insulating fire brick 2 of table
Above insulating fire brick raw material is mixed the high-temperature foaming agent for accounting for material quality fraction 0.4%, its high temperature foams Agent is SiC and BaCO3Mass ratio 1:3 ratio mixing.And 1000 DEG C are warming up to the heating rate of 10 DEG C/min, then with 4 DEG C/heating rate of min is warming up to 1400 DEG C, 2h are incubated at 1400 DEG C, be finally cooled to 980 DEG C with 5 DEG C/min, at 980 DEG C Insulation 2.5h, then 500 DEG C are cooled to 1 DEG C/min, finally 50 DEG C are cooled to 2 DEG C/min.Remaining step and 1 phase of embodiment Together.
Finally, the insulating fire brick unit weight produced is 450kg/m3, cold crushing strength is 7.9MPa, and 1150 DEG C are heated Permanent Linear change rate 1.8%, 350 DEG C of ± 25 DEG C of thermal conductivity factor 0.21W/ (m K).
Embodiment 3
On the basis of embodiment 2, using the raw material of same composition, its raw material chemical composition is by mass percentage such as table 2。
Above insulating fire brick raw material is mixed the high-temperature foaming agent for accounting for material quality fraction 0.6%, its high temperature foams Agent is CaCO3, SiC and BaCO3By 1:3:2 ratio mixing.And be warming up to 1000 DEG C with the heating rate of 5 DEG C/min, then with The heating rate of 4 DEG C/min is warming up to 1360 DEG C, is incubated 1.5h at 1360 DEG C, is finally cooled to 980 DEG C with 5 DEG C/min, 980 DEG C insulation 2.5h.Remaining step is same as Example 1.
Finally, the insulating fire brick unit weight produced is 480kg/m3, cold crushing strength is 8.5MPa, and 1150 DEG C are heated Permanent Linear change rate 1.6%, 350 DEG C of ± 25 DEG C of thermal conductivity factor 0.22W/ (m K).
Embodiment 4
On the basis of embodiment 2, using the raw material of same composition, its raw material chemical composition is by mass percentage such as table 2。
Above insulating fire brick raw material is mixed the high-temperature foaming agent for accounting for material quality fraction 0.8%, its high temperature foams Agent is SiC, CaSO4And BaCO3By 2:1:3 ratio mixing.And be warming up to 1000 DEG C with the heating rate of 8 DEG C/min, then with The heating rate of 3 DEG C/min is warming up to 1420 DEG C, is incubated 2h at 1420 DEG C, is finally cooled to 980 DEG C with 5 DEG C/min, at 980 DEG C Insulation 2.5h.Remaining step is same as Example 1.
Finally, the insulating fire brick unit weight produced is 410kg/m3, cold crushing strength is 5.9MPa, and 1150 DEG C are heated Permanent Linear change rate 1.6%, 350 DEG C of ± 25 DEG C of thermal conductivity factor 0.18W/ (m K).
Embodiment 5
On the basis of embodiment 1, using the raw material of another kind of composition, its raw material chemical composition is by mass percentage such as Under：
The raw material composition of 3 insulating fire brick 5 of table
Above insulating fire brick raw material is mixed the high-temperature foaming agent for accounting for material quality fraction 0.4%, its high temperature foams Agent is SiC, CaSO4And BaCO3By 1:1:2 ratio mixing.And 1000 DEG C are warming up to the heating rate of 10 DEG C/min, then 1450 DEG C are warming up to the heating rate of 2 DEG C/min, 1.5h are incubated at 1450 DEG C, are finally cooled to 980 DEG C with 7 DEG C/min, 980 DEG C of insulation 2.5h.Remaining step is same as Example 1.
Finally, the insulating fire brick unit weight produced is 495kg/m3, cold crushing strength is 9.5MPa, and 1150 DEG C are heated Permanent Linear change rate 1.3%, 350 DEG C of ± 25 DEG C of thermal conductivity factor 0.23W/ (m K).

Claims (8)

1. a kind of preparation method of insulating fire brick, it is characterised in that comprise the following steps：
1) in basestocks high-temperature foaming agent, combined grinding is added to obtain batch to 250 mesh standard sieves are crossed；High-temperature foaming agent For CaCO3、SiC、CaSO4、BaCO3In any 2 kinds or mixing of more than two kinds；
2) batch is spread into heap in mould, is placed in high temperature furnace, 1000 DEG C, then 2～5 DEG C/min are warming up to 5～10 DEG C/min 1300 DEG C～1450 DEG C are warming up to, 1～2h is incubated；
3) 900～1000 DEG C are cooled to 5～7 DEG C/min, and 2～3.5h is incubated at 900～1000 DEG C, then with 1～2 DEG C/min 500 DEG C are cooled to, are finally cooled to 2～4 DEG C/min<50 DEG C, remove mould and obtain insulating fire brick.
2. the preparation method of insulating fire brick as claimed in claim 1, it is characterised in that the chemical composition range that basestocks are included For Al2O3：35～48wt%, SiO2：35～55wt%, CaO+MgO：4～15wt%, Na2O+K2O：1～5wt%, Fe2O3： 0.1～3wt%.
3. the preparation method of insulating fire brick as claimed in claim 1, it is characterised in that mass ratio shared by high-temperature foaming agent is 0.1 ～1.0wt%, foaming agent average grain diameter are respectively less than 13 μm, and purity is all higher than 98%.
4. the preparation method of insulating fire brick as claimed in claim 1, it is characterised in that high-temperature foaming agent is SiC and CaSO4Quality Than 2:1 mixing；Batch is placed in high temperature furnace, is warming up to 1000 DEG C with the heating rate of 8 DEG C/min, then with 2 DEG C/min Heating rate be warming up to 1320 DEG C, 1320 DEG C be incubated 1h；900 DEG C are cooled to 5 DEG C/min, in 900 DEG C of insulation 3h, then with 1 DEG C/min is cooled to 500 DEG C, is finally cooled to 50 DEG C with 2 DEG C/min.
5. the preparation method of insulating fire brick as claimed in claim 1, it is characterised in that high-temperature foaming agent is SiC and BaCO3Quality Than 1:3 mixing；Batch is placed in high temperature furnace, is warming up to 1000 DEG C with the heating rate of 10 DEG C/min, then with 4 DEG C/min Heating rate be warming up to 1400 DEG C, 1400 DEG C be incubated 2h；Finally 980 DEG C are cooled to 5 DEG C/min, be incubated at 980 DEG C 2.5h, then 500 DEG C are cooled to 1 DEG C/min, finally 50 DEG C are cooled to 2 DEG C/min.
6. the preparation method of insulating fire brick as claimed in claim 1, it is characterised in that high-temperature foaming agent is CaCO3, SiC and BaCO3Mass ratio 1:3:2 mixing；Batch is placed in high temperature furnace, is warming up to 1000 DEG C with the heating rate of 5 DEG C/min, so 1360 DEG C are warming up to the heating rate of 4 DEG C/min afterwards, 1.5h are incubated at 1360 DEG C, are finally cooled to 980 DEG C with 5 DEG C/min, 2.5h is incubated at 980 DEG C, then 500 DEG C is cooled to 1 DEG C/min, be finally cooled to 50 DEG C with 2 DEG C/min.
7. the preparation method of insulating fire brick as claimed in claim 1, it is characterised in that high-temperature foaming agent is SiC, CaSO4With BaCO3Mass ratio 2:1:3 mixing；Batch is placed in high temperature furnace, is warming up to 1000 DEG C with the heating rate of 8 DEG C/min, so 1420 DEG C are warming up to the heating rate of 3 DEG C/min afterwards, 2h are incubated at 1420 DEG C, are finally cooled to 980 DEG C with 5 DEG C/min, 980 DEG C of insulation 2.5h, then 500 DEG C are cooled to 1 DEG C/min, finally 50 DEG C are cooled to 2 DEG C/min.
8. the preparation method of insulating fire brick as claimed in claim 1, it is characterised in that high-temperature foaming agent is SiC, CaSO4With BaCO3Mass ratio 1:1:2 mixing；Batch is placed in high temperature furnace, is warming up to 1000 DEG C with the heating rate of 10 DEG C/min, so 1450 DEG C are warming up to the heating rate of 2 DEG C/min afterwards, 1.5h are incubated at 1450 DEG C, are finally cooled to 980 DEG C with 7 DEG C/min, 2.5h is incubated at 980 DEG C, then 500 DEG C is cooled to 1 DEG C/min, be finally cooled to 50 DEG C with 2 DEG C/min.
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CN113087505A (en) * 2021-02-24 2021-07-09 湖州师范学院 High-temperature-resistant ceramic composite material and preparation method and application thereof

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CN104744071A (en) * 2015-03-26 2015-07-01 信阳科美新型材料有限公司 Special composite foaming agent for lightweight heat-insulating ceramic
CN104926316A (en) * 2015-07-23 2015-09-23 武汉科技大学 Porous silicon nitride-silicon carbide composite ceramic material and preparation method thereof
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JPS5983943A (en) * 1982-10-30 1984-05-15 Matsushita Electric Works Ltd Manufacture of foamed ceramic plate
KR970069916A (en) * 1996-04-19 1997-11-07 장기중 How to make new foamed glass
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CN104744071A (en) * 2015-03-26 2015-07-01 信阳科美新型材料有限公司 Special composite foaming agent for lightweight heat-insulating ceramic
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113087505A (en) * 2021-02-24 2021-07-09 湖州师范学院 High-temperature-resistant ceramic composite material and preparation method and application thereof

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