CN104557073A - Light refractory brick for high-temperature furnaces - Google Patents
Light refractory brick for high-temperature furnaces Download PDFInfo
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- CN104557073A CN104557073A CN201410648912.XA CN201410648912A CN104557073A CN 104557073 A CN104557073 A CN 104557073A CN 201410648912 A CN201410648912 A CN 201410648912A CN 104557073 A CN104557073 A CN 104557073A
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- clay
- slag
- sulphur
- polyvinyl chloride
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Abstract
The invention discloses a light refractory brick for high-temperature furnaces. The light refractory brick for high-temperature furnaces is prepared by the following steps: (1) burdening: selecting sulfur residue powder, clay, a pore forming material and alumina as raw materials, wherein the proportion of the sulfur residue powder to the clay is 1.1-1.3, the pore forming material is a mixture of saw dust and polyvinyl chloride balls, the addition of the saw dust is 12-14% of the total weight of the sulfur residue powder and the clay, the addition of the alumina is 10-15% of the total weight of the sulfur residue powder and the clay and the addition of the polyvinyl chloride balls is 1-2% of the total weight of the sulfur residue powder and the clay; (2) mashing; (3) mixing by using a secondary mixing process; (4) ageing the mixture; (5) sintering at 1400-1500 DEG C; (6) preserving the temperature for 4-6h; (7) molding; (8) maintaining. The light refractory brick for high-temperature furnaces is relatively high in cold crushing strength and thermal shock resistance frequency and good in heat-conducting property.
Description
Technical field
The present invention relates to building material field, particularly the preparation method of high temperature kiln light fire brick.
Background technology
Industrial Stoves energy consumption is serious, and the thermosteresis of kiln generally accounts for 24% ~ 25% of fuel consumption.Traditional industry stove is the object reaching heat preservation energy-saving, usually to construct external increase thermal insulation layer at heavy refractory brick marshalling or heavy unshape refractory.Because the lagging material Applicable temperature adopted is lower, the use on medium and high temperature industrial furnace is subject to great restriction, and the kiln of heavy laying fireproof bricks is bulky, heavy.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of preparation method that can be applicable to the light fire brick of high temperature kiln, and light fire brick prepared by the method has the features such as low density, low heat conductivity, excellent thermal insulation performance.
For this reason, the preparation method of high temperature kiln light fire brick provided by the invention comprises the following steps:
(1) prepare burden
Raw material choose sulphur ground-slag, clay, pore-forming material, alumina, sulphur ground-slag and clay ratios are 1.1 ~ 1.3, pore-forming material selects wood chip and polyvinyl chloride ball compound, wood chip add-on is 12% ~ 14% of sulphur ground-slag and clay gross weight, alumina add-on is 10% ~ 15% of sulphur ground-slag and clay gross weight, and polyvinyl chloride ball add-on is 1% ~ 2% of sulphur ground-slag and clay gross weight;
(2) pulverize
Adopt roll crusher sulfur residue to be pulverized, then wear into SULPHUR POWDER with ball mill, and sieve, SULPHUR POWDER fineness is 325 orders, wood chip and polyvinyl chloride ball Raymond mill levigate and sieve, wood chip fineness is less than 1mm, and polyvinyl chloride ball fineness is less than 2mm;
(3) batch mixing
Adopt Secondary mixing, churning time is 2 ~ 3min for the first time, and rotating speed is 80 ~ 120r/min, then adds 10% ~ 12% water and makes it to be mixed into plastic shape, and second time churning time is 3 ~ 4min, and rotating speed is 150 ~ 210r/min;
(4) ageing mixture
Ageing mixture carries out in ageing mixture storehouse, and the ageing mixture time is 7 ~ 9h, and ageing mixture equipment adopts reversible moving formula distributor;
(5) sinter
Firing temperature adopts 1400 ~ 1500 DEG C, and optimum temps is 1450 DEG C;
(6) be incubated
Soaking time is 4 ~ 6h;
(7) shaping
Shaping employing semi-hard plastic double-stage vacuum extruding machine, forming pressure is 10MPa, is of a size of 240mm × 115mm × 90mm or 390mm × 190mm × 190mm.
(8) maintenance
At room temperature maintenance 48h.
Cold crushing strength and the thermal shock resistance number of times of the light fire brick adopting the preparation method of high temperature kiln light fire brick provided by the invention to manufacture are higher, and heat conductivility is good.
Embodiment
The embodiment of the preparation method of high temperature kiln light fire brick provided by the invention comprises the following steps:
(1) prepare burden
Raw material choose sulphur ground-slag, clay, pore-forming material, alumina.Sulphur ground-slag and clay ratios are 1.2, and wood chip add-on is 13% of sulphur ground-slag and clay gross weight, and polyvinyl chloride ball add-on is 1.5% of sulphur ground-slag and clay gross weight, and alumina add-on is 12% of sulphur ground-slag and clay gross weight.
Pore-forming material kind and granularity have considerable influence to goods physical property, and wood chip is fibrous primarily of needle-like or column, and polyvinyl chloride ball is spheroidal particle.Therefore wood chip leaves the irregular hole of pin, column after burning, and polyvinyl chloride ball leaves the hole of spheroidal.Polyvinyl chloride ball is less due to unit weight, and add polyvinyl chloride ball and be more conducive to the volume density after reducing goods burning, dry shrinkage is little, and shaping rear base substrate water content is low, and product dried distortion is little, and final dimension is accurate.In addition, wood chip easily absorbs water, and be conducive to transmission and the absorption of moisture content, and easily burn mistake, and polyvinyl chloride ball water-absorbent is poor, but not yielding after burning, and the two adobe burning that can prevent used in combination ftractures afterwards.
The reaction occurred heat-processed from clay and sulphur ground-slag is known, occur the major cause of volumetric shrinkage be due to the burning of pore-forming material lose, clay dewaters in sintering process, decompose, chemical combination and densified sintering product thereof.But along with the increase of sulphur ground-slag and clay ratios, the SiO that enough sulphur ground-slags and clay decompose
2abundant reaction generates mullite, and the amount that mullite generates is more, and the amount offsetting volumetric shrinkage is larger; But sulphur ground-slag add-on is too much, and sulphur ground-slag can promote the further sintering of goods, makes shrink of product increase again, after burning, intensity can increase with the increase of sulphur ground-slag add-on, and 1.1 time, intensity reaches maximum value; But when the two ratio is greater than 1.3, because sulphur ground-slag too much causes goods, burning post shrinkage is increased.Therefore the ratio of sulphur ground-slag/clay is best between 1.1 ~ 1.3.
The add-on of suitable increase alumina can improve the thermal shock resistance of goods, the at high temperature main mineral composition of alumina is corundum, mullite, quartz and a small amount of glassy phase, due to the mineral facies that mullite is a kind of low thermal expansion, its pillar-shaped crystal forms the skeleton structure in intersecting in microstructure, is conducive to the raising of thermal shock resistance and intensity.Alumina add-on is more, and under high temperature, mullite generates mutually the more, and meanwhile, quartz is conducive to increasing liquid viscosity mutually, improves creep-resistant property and thermal shock resistance under goods high temperature.In addition, be conducive to the adding of alumina reducing the cost of goods and strengthen sintering character, because high temperature burns till rear generation mullite, the contraction that mullite causes after expanding and counteracting product part burning, the linear shrinkage rear with burning of the volume density can burning be reduced in appropriate scope after.
(2) pulverize
Adopt roll crusher sulfur residue to be pulverized, then wear into SULPHUR POWDER with ball mill, and sieve, SULPHUR POWDER fineness is 325 orders; Wood chip and polyvinyl chloride ball Raymond mill levigate and sieve, wood chip fineness is less than 1mm; Polyvinyl chloride ball fineness is less than 2mm.
The granularity of sulphur ground-slag is larger, and specific surface area is less, and sintering contact area is little, affects solid state sintering speed.The granularity of sulphur ground-slag is thinner, and specific surface area is larger, and reaction activity enhancing, is more conducive to sulphur ground-slag and clay decomposites unbodied SiO
2generate mullite, and counteract because interior tissue sinters the contraction caused due to the expansion of mullite.
(3) batch mixing
Adopt Secondary mixing, churning time is 2 ~ 3min for the first time, and rotating speed is 80 ~ 120r/min, then adds 10% ~ 12% water and makes it to be mixed into plastic shape; Second time churning time is 3 ~ 4min, and rotating speed is 150 ~ 210r/min.Because of material light weight, should adopt forced stirrer that mixing of materials just can be made even, increase degree of compactness, create conditions to shaping.Churning time also affects moulding moisture and Forming Quality.
(4) ageing mixture
Ageing mixture carries out in ageing mixture storehouse, and the best ageing mixture time is 8h, and ageing mixture equipment adopts reversible moving formula distributor.
Ageing mixture has following effect: one is by adding water, and makes compound in banking process, by the effect of kapillary and vapour pressure, makes the moisture distribution in compound more even; Two are abundant aquations of particle of binding material and carry out ion-exchange, thus improve the plasticity of material; Three is the content increasing humic acid substance, improves mud material forming performance.Ageing mixture can increase plasticity, improves mobility and the cohesiveness of raw material, makes shaping block surface smooth.
(5) sinter
table 1for firing temperature is on the impact of brick physicals,
in tablereflect the rising along with firing temperature, apparent porosity increases, but volume density with burn after linear shrinkage reduces, in 1450 DEG C of situations brick volume density with burn after in linear shrinkage and 1500 DEG C of situations brick volume density with burn rear linear shrinkage and fluctuate not quite, in 1450 DEG C of situations, intensity is the highest; Growing amount and the reticulattion of mullite are more obvious.Consider physical property, industrial manufacturing cost and meet the design requirements of product, optimum burning temperature-forming is 1450 DEG C.
table 1firing temperature is on the impact of brick physicals
(6) be incubated
table 2for soaking time is on the impact of brick physicals,
table 2middle firing temperature is 1450 DEG C.
in tablereflection soaking time is longer, and apparent porosity is less, and volume density is larger, and goods inside is finer and close.Suitably increase soaking time, be conducive to solid phase and liquid reactively complete further, making sample reach better sintering.Best soaking time is 5h.
table 2soaking time is on the impact of brick physicals
(7) shaping
Shaping employing semi-hard plastic double-stage vacuum extruding machine, forming pressure is 10MPa, is of a size of 240mm × 115mm × 90mm or 390mm × 190mm × 190mm.
(8) maintenance
At room temperature maintenance 48h.
Light fire brick in embodiment is tested, light fire brick physicals
as table 3shown in.
in tabledisplay high temperature kiln light fire brick cold crushing strength and thermal shock resistance number of times higher, heat conductivility is good.
table 3the physicals of light fire brick
Claims (4)
1. high temperature kiln light fire brick, its feature comprises following making step:
(1) prepare burden
Raw material choose sulphur ground-slag, clay, pore-forming material, alumina, sulphur ground-slag and clay ratios are 1.1 ~ 1.3, pore-forming material selects wood chip and polyvinyl chloride ball compound, wood chip add-on is 12% ~ 14% of sulphur ground-slag and clay gross weight, alumina add-on is 10% ~ 15% of sulphur ground-slag and clay gross weight, and polyvinyl chloride ball add-on is 1% ~ 2% of sulphur ground-slag and clay gross weight;
(2) pulverize
Adopt roll crusher sulfur residue to be pulverized, then wear into SULPHUR POWDER with ball mill, and sieve, SULPHUR POWDER fineness is 325 orders, wood chip and polyvinyl chloride ball Raymond mill levigate and sieve, wood chip fineness is less than 1mm, and polyvinyl chloride ball fineness is less than 2mm;
(3) batch mixing
Adopt Secondary mixing, churning time is 2 ~ 3min for the first time, and rotating speed is 80 ~ 120r/min, then adds 10% ~ 12% water and makes it to be mixed into plastic shape, and second time churning time is 3 ~ 4min, and rotating speed is 150 ~ 210r/min;
(4) ageing mixture
Ageing mixture carries out in ageing mixture storehouse, and the ageing mixture time is 7 ~ 9h, and ageing mixture equipment adopts reversible moving formula distributor;
(5) sinter
Firing temperature adopts 1400 ~ 1500 DEG C;
(6) be incubated
Soaking time is 4 ~ 6h;
(7) shaping
Shaping employing semi-hard plastic double-stage vacuum extruding machine, forming pressure is 10MPa, is of a size of 240mm × 115mm × 90mm or 390mm × 190mm × 190mm;
(8) maintenance
At room temperature maintenance 48h.
2., according to high temperature kiln light fire brick according to claim 1, it is characterized in that the best ageing mixture time is 7 ~ 9h.
3., according to high temperature kiln light fire brick according to claim 1, it is characterized in that firing temperature adopts 1400 ~ 1500 DEG C, optimum temps is 1450 DEG C.
4., according to high temperature kiln light fire brick according to claim 1, it is characterized in that soaking time is 5h.
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| CN201410648912.XA CN104557073B (en) | 2014-10-24 | 2014-10-24 | High temperature kiln light fire brick |
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| CN201410648912.XA CN104557073B (en) | 2014-10-24 | 2014-10-24 | High temperature kiln light fire brick |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1069253A (en) * | 1992-07-28 | 1993-02-24 | 韩峰 | The pyrite slag prescription of baking bricks |
| CN101786844A (en) * | 2010-01-25 | 2010-07-28 | 厦门三荣陶瓷开发有限公司 | Light heat-preserving brick and fabrication method thereof |
| CN102285788A (en) * | 2011-06-17 | 2011-12-21 | 云南常青树投资有限公司 | Method for preparing electroconductive ceramic product from pyrite cinder |
| CN103159492A (en) * | 2013-04-17 | 2013-06-19 | 成都理工大学 | Method for preparing self-siliceous refractory material by utilizing pyrite tailing as raw material |
-
2014
- 2014-10-24 CN CN201410648912.XA patent/CN104557073B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1069253A (en) * | 1992-07-28 | 1993-02-24 | 韩峰 | The pyrite slag prescription of baking bricks |
| CN101786844A (en) * | 2010-01-25 | 2010-07-28 | 厦门三荣陶瓷开发有限公司 | Light heat-preserving brick and fabrication method thereof |
| CN102285788A (en) * | 2011-06-17 | 2011-12-21 | 云南常青树投资有限公司 | Method for preparing electroconductive ceramic product from pyrite cinder |
| CN103159492A (en) * | 2013-04-17 | 2013-06-19 | 成都理工大学 | Method for preparing self-siliceous refractory material by utilizing pyrite tailing as raw material |
Non-Patent Citations (1)
| Title |
|---|
| 范锦忠: "耐火隔热陶粒混凝土及其制品的性能和应用", 《砖瓦》 * |
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Effective date of registration: 20181212 Address after: 063021 Kaifeng Road, Kaiping District, Tangshan City, Hebei Province, 4 km Patentee after: Majiagou Refractories Factory, Kaiping District, Tangshan City Address before: 325000 Third Floor, Natural Home D8, Tangjiaqiao South Road, Lucheng District, Wenzhou City, Zhejiang Province Patentee before: Ye Xiangfei |
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