CN102503494B - Preparation method of high-strength mullite light refractory material - Google Patents
Preparation method of high-strength mullite light refractory material Download PDFInfo
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- CN102503494B CN102503494B CN 201110355526 CN201110355526A CN102503494B CN 102503494 B CN102503494 B CN 102503494B CN 201110355526 CN201110355526 CN 201110355526 CN 201110355526 A CN201110355526 A CN 201110355526A CN 102503494 B CN102503494 B CN 102503494B
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Abstract
The invention discloses a preparation method of a high-strength mullite light refractory material. The method comprises the following steps of: uniformly grinding Suzhou clay, Lushan clay, cyanite, silicon micro powder, mullite powder and brick recirculated baked powder serving as substrates together with wood flour; adding an aluminum dihydrogen phosphate solution of which the using amount is 3-20 percent by weight of the mass of the substrates; and stirring and grinding uniformly, pelletizing, molding a pelletized material under the molding pressure of 40-60 MPa, and baking at the preserved temperature of 1,400-1,450 DEG C. According to the mullite light refractory material prepared with the method, the contradiction between specific weight and strength is solved on the premise of ensuring that the cost is not increased, and the mechanical property is improved.
Description
Technical field
The present invention relates to technical field of refractory materials, be specifically related to a kind of preparation method of high-strength mullite light refractory material.
Background technology
Light fire brick is the heat preserving and insulating material that a kind of volume density is low, void content is high (45%～85%), thermal conductivity is low, be mainly used in the heat insulating of Industrial Stoves, can reduce the body of heater quality, fuel saving consumes, mainly be divided into three major types by use temperature, low temperature light fire brick (＜900 ℃): such as diatomite brick, asbestos brick, pearlstone brick etc.; Middle temperature light fire brick (900～1200 ℃): such as vermiculite, light silicious brick, light weight fireclay brick etc.; High temperature light fire brick (＞1200 ℃): such as light-weight mullite brick, lightweight corundum brick, alumina bubble brick etc.The volume density of mullite light fire brick is at 0.6～1.0g/cm at present
3, 350 ℃ of thermal conductivities also have the volume density of reporting the mullite firebrick for preparing at 0.4g/cm less than 0.4W/ (mK)
3Below, but often when pursuing lightweight, can't satisfy the demand of intensity, general folding strength is lower.The disclosed method of utilizing waste aluminum sludge development light-weight mullite heat insulating refractory material of Chinese patent CN1557762, prepared light-weight mullite refractory brick volume is 0.6～1.0g/cm
3, and folding strength only is 0.7～3MPa, specific tenacity is no more than 3MPa/ (g/cm
3).The disclosed a kind of trichroite of Chinese patent CN1559985-mullite light fire brick and preparation method thereof, prepared mullite light fire brick volume density is 0.9g/cm
3, folding strength is 1.35MPa, specific tenacity only is 1.5MPa/ (g/cm
3).The folding strength of lightweight refractory material in the decrease volume density also sharply descends, and causes specific tenacity to reduce.ZrO
2Although adding can improve the folding strength of material, also sharply increased material volume density, its specific tenacity of major injury simultaneously.Need suitable specific tenacity must coordinate density and intensity.
Therefore, although the characteristics of the low density of light fire brick, lower thermal conductivity have determined its irreplaceability on Industrial Stoves are used, lightweight low density and intensity are and are conflicting, and can have the problem of production cost on industrial application.Need badly and a kind ofly can coordinate density and intensity, have the lightweight refractory of suitable specific tenacity.
Summary of the invention
The object of the present invention is to provide a kind of preparation method of mullite refractory of high-strength light, realize low density and high-intensity coordination by the mullite refractory that the method prepares, and then improving the specific tenacity of mullite refractory, this mullite refractory can use under the condition of temperature 〉=1350 ℃.
The present invention seeks to realize in the following manner:
A kind of preparation method of high-strength mullite light refractory material, the method is native take Suzhou soil, Lushan, kyanite, silicon powder, mullite powder and the ripe powder of brick feed back be as base-material, grind evenly with wood chip, add phosphate dihydrogen aluminum solution, the phosphate dihydrogen aluminum solution consumption is 3～20% (take the total masses of base-material as 100% benchmark) of base-material quality again; Agitation grinding is even, and the forming materials after the granulation is got in granulation, and forming pressure is 40～60MPa, is incubated under 1400～1450 ℃ of conditions and burns till.The density range of the material that burns till is 1.051～1.42g/cm
3Described molding mode is dry-pressing formed, extrusion moulding or plastic pressure forming, and is preferably dry-pressing formed.
Elder generation is warming up to 500 ℃ with the speed of 2～3 ℃/min after the preferred moulding, and the speed with 3～5 ℃/min is warming up to 1000 ℃ again, and the speed with 100～150 ℃/h is warming up to 1400～1450 ℃ at last.The insulation firing time is 1～2h under 1400～1450 ℃ of conditions.
The consumption of the phosphate dihydrogen aluminum solution that adds is preferably 15～20% of base-material quality, and the mass concentration of employed phosphate dihydrogen aluminum solution is 70～80%.The present invention adds wood chip as burnout substances in base-material, the consumption of wood chip can for 10～50% (take the total masses of base-material as 100% as benchmark) of base-material quality, preferably account for 20～50% of base-material total mass.The wood chip fineness is not done requirement, and 20～100 orders are excellent.
Base-material of the present invention preferably forms (take each component sum of base-material as 100%) and is 20～30wt% Suzhou soil, 10～20wt% Lushan soil, the kyanite of 3～6wt%, 3～6wt% silicon powder, 10～15wt% mullite powder, the ripe powder of 30～40wt%140 order brick feed back.The one-tenth of the ripe powder of brick feed back is grouped into (take each component sum of the ripe powder of brick feed back as 100%) as Al
2O
354～78wt%, SiO
220～44wt%, Fe
2O
30.5～1wt%, Na
2O 0.5～1wt% and impurity 0.5～4wt%.Wherein, Al
2O
3And SiO
2Middle mullite accounts for 78～85wt% mutually (with Al
2O
3And SiO
2Sum is 100%).The ripe powder of brick feed back can derive from the powder that refractory brick that Suzhou soil, Lushan soil, kyanite, silicon powder and mullite powder burn till according to ordinary method obtains after the fragmentation again.
Preferred its composition of the ripe powder of brick feed back consists of 64wt%Al
2O
3, 32wt%SiO
2, 0.7wt%Fe
2O
3, 0.7wt%Na
2O and 2.6wt% impurity; Wherein, Al
2O
3And SiO
2Middle mullite phase scope 78～85wt% is (with Al
2O
3And SiO
2Sum is 100%).Material of the present invention is commercially available getting all.
The present invention adds phosphate dihydrogen aluminum solution and the wood chip of certain proportion consumption, and be controlled to type pressure when moulding on the basis of conventional refractory materials base-material.Wherein, lose material with wood chip as burning, the afterburnt can stay hole equally distributed, disperse, irregular shape, can cushion the stress that produces in the goods process of expansion and contraction, the goods thermal shock resistance is improved, and the even hole that stays has been realized the low-density requirement of lightweight.Add phosphate dihydrogen aluminum solution as high-temperature agglomerant, by phosphatic polymerization and many condensation polymerizations, so that the cementing adhesive attraction in the material structure strengthens, the strength of materials increases.
Beneficial effect of the present invention compared with the prior art: the present invention utilizes wood chip to improve the high porosity of refractory brick as burnout substances, reduce material volume density, add a certain amount of phosphate dihydrogen aluminum solution as high-temperature agglomerant, changed the refractory materials internal structure, so that average folding strength increases significantly, and the control forming pressure realizes matter gently and high-strength coordination.The present invention guarantees low-density its intensity that significantly improves simultaneously of light fire brick on the basis that does not increase cost.
Embodiment
Below by specific embodiment the present invention is further elaborated, should not be construed as limited overall technical solution.
Embodiment 1
Base-material consists of (take the quality of base-material as 100%): 20wt% Suzhou soil, 20wt% Lushan soil, the kyanite of 6wt%, 6wt% silicon powder, 10wt% mullite powder, the ripe powder of 38wt%140 order brick feed back.
Wherein, (take the ripe powder of brick feed back as 100%) composition consists of 64wt%Al in the ripe powder of brick feed back
2O
3, 32wt%SiO
2, 0.7wt%Fe
2O
3, 0.7wt%Na
2O and 2.6wt% impurity; At Al
2O
3And SiO
2Middle mullite phase scope is at 78～85wt%.
(1) batching: base-material and 20～100 order wood chip mass ratioes are 50: 20.
(2) grind: the mixed powder for preparing is ground evenly.
(3) granulation: it is even that 15% the aluminium dihydrogen phosphate aqueous solution that adds concentration during the powder that mixes adds and be 70～80wt%, consumption and be the base-material quality continues agitation grinding, granulation.
(4) moulding: get powder after an amount of granulation in mould, conventional dry-pressing formed, the adjustment forming pressure is 58MPa.The long 80mm of strip after the moulding, wide 18mm, high 5.7mm.
(5) high temperature burns till: when burning till, the speed with 2～3 ℃/min is warming up to 500 ℃ first, and the speed with 3～5 ℃/min is warming up to 1000 ℃ again, and the speed with 100～150 ℃/h is warming up to 1400 ℃ at last, and 1h is burnt till in insulation under 1400 ℃ of conditions of temperature.The long 78mm of the strip that obtains after burning till, wide 18mm, high 5.2mm.
Embodiment 2
Base-material consists of (take the quality of base-material as 100%): 30wt% Suzhou soil, 10wt% Lushan soil, the kyanite of 3wt%, 3wt% silicon powder, 15wt% mullite powder, the ripe powder of 39wt%140 order brick feed back.
Wherein, (take the ripe powder of brick feed back as 100%) composition consists of 64wt%Al in the ripe powder of brick feed back
2O
3, 32wt%SiO
2, 0.7wt%Fe
2O
3, 0.7wt%Na
2O and 2.6wt% impurity, Al
2O
3And SiO
2Middle mullite phase scope is at 78～85wt%.
(1) batching: base-material and wood chip mass ratio are 50: 25.
(2) grind: the mixed powder for preparing is ground evenly.
(3) granulation: it is 70～80wt% that the powder that mixes adds concentration, and it is even that consumption is that 15% aluminium dihydrogen phosphate aqueous solution of base-material quality continues agitation grinding, granulation.
(4) moulding: get powder after an amount of granulation in mould, conventional dry-pressing formed, the adjustment forming pressure is 50MPa.The long 80mm of strip after the moulding, wide 18mm, high 5.6mm.
(5) high temperature burns till: when burning till, the speed with 2～3 ℃/min is warming up to 500 ℃ first, and the speed with 3～5 ℃/min is warming up to 1000 ℃ again, and the speed with 100～150 ℃/h is warming up to 1400 ℃ at last, and 2h is burnt till in insulation under 1400 ℃ of conditions of temperature.The long 78mm of the strip that obtains after burning till, wide 18mm, high 5.1mm.
Embodiment 3
Base-material consists of (take the quality of base-material as 100%): 25wt% Suzhou soil, 15wt% Lushan soil, the kyanite of 5wt%, 5wt% silicon powder, 15wt% mullite powder, the ripe powder of 35wt%140 order brick feed back.
Wherein, (take the ripe powder of brick feed back as 100%) composition consists of 56wt%Al in the ripe powder of brick feed back
2O
3, 40wt%SiO
2, 0.6wt%Fe
2O
3, 0.7wt%Na
2O and 2.7wt% impurity, Al
2O
3And SiO
2Middle mullite phase scope is at 78～85wt%.
(1) batching: base-material and wood chip mass ratio are 50: 22.5.
(2) grind: the mixed powder for preparing is ground evenly.
(3) granulation: it is 70～80wt% that the powder that mixes adds concentration, and consumption is that the aluminium dihydrogen phosphate aqueous solution continuation agitation grinding of base-material quality 15% is even, granulation.
(4) moulding: get powder after an amount of granulation in mould, conventional dry-pressing formed, the adjustment forming pressure is 50MPa.The long 80mm of strip after the moulding, wide 18mm, high 5.7mm.
(5) high temperature burns till: when burning till, the speed with 2～3 ℃/min is warming up to 500 ℃ first, and the speed with 3～5 ℃/min is warming up to 1000 ℃ again, and the speed with 100～150 ℃/h is warming up to 1450 ℃ at last, and 1h is burnt till in insulation under 1450 ℃ of conditions of temperature.The long 78mm of the strip that obtains after burning till, wide 18mm, high 5.0mm.
Comparative Examples
Be the high-strength mullite light refractory material for preparing according to embodiment 2 methods, only different is not add phosphate dihydrogen aluminum solution in the preparation process.
The material of embodiment 4～9 for preparing according to embodiment 1 method, in the preparation process, embodiment presses the consumption of mass ratio, forming pressure and the phosphate dihydrogen aluminum solution of the described adjustment wood chip of table 1 and base-material.
Adopt refractory brick industry ordinary method to carry out nature examination to the material for preparing according to embodiment 1-9 and Comparative Examples method.Concrete grammar is: under the normal temperature, get dry strip, the ratio bulk density of the strip dry weight that weighing is obtained and the volume of strip (the wide * of long * is high); Utilize three-point bending method test strip bending strength.Concrete test result sees Table 1.
The material properties test that table 1 embodiment 1-9 and Comparative Examples method prepare is table as a result
Claims (8)
1. the preparation method of a high-strength mullite light refractory material, the method is native take Suzhou soil, Lushan, kyanite, silicon powder, mullite powder and brick return chamotte powder as base-material, it is characterized in that base-material and wood chip are ground evenly, add phosphate dihydrogen aluminum solution, the phosphate dihydrogen aluminum solution consumption is 3 ~ 20wt% of base-material quality again; Agitation grinding is even, and the forming materials after the granulation is got in granulation, and forming pressure is 40 ~ 60MPa, is incubated under 1400～1450 ℃ of conditions and burns till; Wherein, the consumption of wood chip is 10 ~ 50wt% of base-material quality; Base-material specifically consists of: 20 ~ 30wt% Suzhou soil, 10 ~ 20wt% Lushan soil, the kyanite of 3 ~ 6wt%, 3 ~ 6wt% silicon powder, 10 ~ 15wt% mullite powder, 30 ~ 40wt%140 order brick return chamotte powder.
2. the preparation method of high-strength mullite light refractory material according to claim 1, after it is characterized in that described moulding, speed with 2 ~ 3 ℃/min is warming up to 500 ℃ first, speed with 3 ~ 5 ℃/min is warming up to 1000 ℃ again, and the speed with 100 ~ 150 ℃/h is warming up to 1400～1450 ℃ at last.
3. the preparation method of high-strength mullite light refractory material according to claim 1 is characterized in that the insulation firing time is 1 ~ 2h under 1400～1450 ℃ of conditions.
4. the preparation method of high-strength mullite light refractory material according to claim 1 is characterized in that the consumption of the phosphate dihydrogen aluminum solution that adds is 15 ~ 20wt% of base-material quality.
5. the preparation method of high-strength mullite light refractory material according to claim 1, the mass concentration that it is characterized in that employed phosphate dihydrogen aluminum solution is 70 ~ 80wt%.
6. the preparation method of high-strength mullite light refractory material according to claim 1 is characterized in that described brick returns the Al that consists of of chamotte powder
2O
354 ~ 78 wt%, SiO
220 ~ 44wt%, Fe
2O
30.5 ~ 1wt%, Na
2O 0.5 ~ 1wt% and impurity 0.5 ~ 4wt%.
7. the preparation method of high-strength mullite light refractory material according to claim 1 is characterized in that described dry-pressing formed, extrusion moulding or the plastic pressure forming of being shaped to.
8. the preparation method of high-strength mullite light refractory material according to claim 7, it is characterized in that described be shaped to dry-pressing formed.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102964136A (en) * | 2012-11-23 | 2013-03-13 | 山东鲁阳股份有限公司 | Method for producing lightweight heat insulation bricks by utilizing natural raw materials, namely pyrophillite and cyanite |
| CN103204692B (en) * | 2013-05-10 | 2015-04-15 | 郑州瑞泰耐火科技有限公司 | Novel lightweight mullite brick and fabrication method thereof |
| CN103864403B (en) * | 2014-04-03 | 2015-07-15 | 武汉科技大学 | Mullite light heat-insulation brick based on kyanite tailings and manufacturing method of brick |
| CN106431371B (en) * | 2016-09-22 | 2019-11-05 | 郑州大学 | A kind of high-strength closed pore mullite material and preparation method thereof |
| CN107151148A (en) * | 2017-05-11 | 2017-09-12 | 焦作诺尔曼炉业有限公司 | A kind of cordierite thermal insulation fire-resistant ball and preparation method thereof |
| CN113121259A (en) * | 2021-03-17 | 2021-07-16 | 宜兴摩根热陶瓷有限公司 | Light heat-insulating refractory material and preparation method thereof |
| CN113754456B (en) * | 2021-11-09 | 2022-03-08 | 长沙中瓷新材料科技有限公司 | Mullite-based ceramic material and preparation method thereof |
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