CN103964868B - Magneticsubstance calcining kiln push pedal and preparation method thereof - Google Patents
Magneticsubstance calcining kiln push pedal and preparation method thereof Download PDFInfo
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- CN103964868B CN103964868B CN201410183326.2A CN201410183326A CN103964868B CN 103964868 B CN103964868 B CN 103964868B CN 201410183326 A CN201410183326 A CN 201410183326A CN 103964868 B CN103964868 B CN 103964868B
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Abstract
The invention discloses a kind of magneticsubstance calcining kiln push pedal and preparation method thereof.The component of this kiln push pedal mainly comprises 3-0.1mm fused mullite 6-8 part, 325 order following fused white corundum 1-2 part, free SiO
2molochite 0.5-2 part in vitreous state and bonding clay 0.3-0.6 part.The preparation method of this kiln push pedal comprise the preparation of premix, compound preparation, blank forming, dry and burn till.Advantage of the present invention is that the heat-resistant knocking stability of this kiln push pedal is high, intensity is high, extends work-ing life, obtains economic benefit thus comparatively objective; The preparation method of kiln push pedal of the present invention is simple, easily realize.
Description
Technical field
The present invention relates to a kind of kiln push pedal and preparation method thereof, particularly relate to a kind of magneticsubstance calcining kiln push pedal and preparation method thereof.
Background technology
Pushed bat kiln is the Thermal Equipment that chemical field is conventional, and current magneticsubstance has sintered mostly in ejection plate kiln.The working temperature of kiln between 1100 DEG C-1450 DEG C, and takes nitrogen filled protection.Kiln push pedal is one of parts very important in kiln, it adopts corundum-mullite to make, meanwhile, in use can not there is fracture, be out of shape or fall the phenomenons such as block in it usually more than 6 months work-ing life, otherwise arch kiln accident will be there is, the i.e. stuck passage of push pedal, ledal-pushing machine pushes away motionless, and the consequence caused thus is gently then stopped kiln and repaired, heavy then kiln process will be torn open, cause heavy losses to applying unit.Trace it to its cause: pushed bat kiln is cyclic production, kiln push pedal need stand the thermal shockings comparatively frequently such as room temperature-high temperature-room temperature, so the heat-resistant knocking stability of kiln push pedal can be the major cause determining its work-ing life, and existing kiln push pedal existing defects in this regard just, draw technical problem urgently to be resolved hurrily thus.
Summary of the invention
Goal of the invention: the first object of the present invention is to provide a kind of magneticsubstance calcining kiln push pedal that can improve heat-resistant knocking stability energy; The second object of the present invention is to provide the preparation method of this push pedal.
Technical scheme: magneticsubstance calcining kiln of the present invention push pedal, is characterized in that the component comprising following weight part:
Wherein, described fused mullite is 3-1mm3 part, 1-0.5mm2 part, 0.5-0.1mm2 part.
Described free SiO
2the granularity of the molochite in vitreous state is below 200 orders.
Described fused white corundum is 1.5 parts, below 200 orders.
Described bonding clay is Guangxi bonding clay.
The preparation method of magneticsubstance calcining kiln of the present invention push pedal, comprises the steps:
(1) preparation of premix: take the following fused white corundum of 1-2 part 200 order, 0.5-2 part dissociates SiO
2molochite in vitreous state and 0.3-0.6 part bonding clay, for subsequent use after being uniformly mixed;
(2) preparation of compound: take 6-8 part 3-0.1mm fused mullite, adds premix and water successively, then mixed grind discharging after mixing;
(3) blank forming: compound compression moulding under 290-320Mpa condition is obtained base substrate;
(4) dry: base substrate is dried to residual moisture lower than 0.5%;
(5) burn till: base substrate burns till 5-6h through 1500-1600 DEG C and namely obtains the push pedal of magneticsubstance calcining kiln.
Wherein, in step (1), described stirring carries out in taper stirring mixer, and stirring velocity controls to turn/min at 30-40, and churning time is 1-1.5h.
In step (2), the mixing time of described fused mullite is 5-6min, and amount of water is 0.3-0.5 part, and the mixed grind time is 25-30 minute, and described mixed grind is ground in mixing machine at planetary mud and carried out.
Beneficial effect: compared with prior art, its remarkable advantage is in the present invention: the heat-resistant knocking stability of magneticsubstance calcining kiln of the present invention push pedal is high, intensity is high, extend work-ing life, obtains economic benefit comparatively objective thus; The preparation method of kiln push pedal of the present invention is simple, easily realize.
Embodiment
Below technical scheme of the present invention is elaborated.
Kiln push pedal of the present invention mainly comprises fused mullite, fused white corundum, molochite and bonding clay.Wherein, the object adding molochite in push pedal is: one is promote push pedal sintering, improves its intensity; Two is volume effects that minimizing push pedal produces in sintering process, improves yield rate; Three is the heat-resistant knocking stability improving push pedal.Data in reference table 1, existing push pedal does not add molochite, swelling is there is in it in sintering process, push pedal fraction defective is up to 10%, simultaneously because sintering degree is bad, easy arrisdefect in using, and heat-resistant knocking stability is 60 times (1100 DEG C of water-cooleds), can not meet the service requirements using producer growing.We adopted principal crystalline phase to be mullite, free SiO afterwards
2for the molochite of cristobalite is tested, though find that the sintering degree of push pedal increases, namely cold crushing strength can reach 110Mpa, and heat-resistant knocking stability improves little, and namely heat-resistant knocking stability only has 65 times.Through researching and analysing, we find SiO free in molochite
2be exist with alpha-quartz (i.e. cristobalite) form mostly, only have the SiO of minute quantity
2exist with glassy form, when standing room temperature-high temperature-ambient temperature change, cristobalite transforms to tridymite, and direction is reversible, causes volume change, therefore little to the heat-resistant knocking stability effect improving push pedal.Through further Exploring Analysis, we adopt principal crystalline phase to be mullite, free SiO
2test with the molochite that glassy form exists, find that obtained push pedal sintering degree is better, cold crushing strength is up to 120Mpa, and heat-resistant knocking stability is up to 90 times, and the yield rate of product brings up to 98%.Trace it to its cause, this molochite is when standing the change of room temperature-high temperature-ambient temperature, and not only himself volume has almost no change, but also can the volume change that produces because of temperature variation of other crystal of partial offset, thus making the volume stability of whole material, heat-resistant knocking stability can be good.
Secondly, the particle diameter of molochite and add-on also have fastidious, and china clay granularity is preferably below 200 orders, add-on is 0.5-2 part, and proportion is corresponding less, and granularity selection is excessively thick, can not be uniformly dispersed, affect the outward appearance of product, and not reach the object promoting product sintering; Granularity is meticulous does not reach the maximized raw material granularity ratio requirement of blank density, affects the volume density of product.Except molochite, in push pedal, fused mullite Task-size Controlling is at 3-0.1mm, and add-on is 6-8 part; The granularity of fused white corundum is below 200 orders, and add-on is 1-2 part; Bonding clay is 0.3-0.6 part (be preferably Guangxi bonding clay, this clay is beneficial to shaping, affordable).These components and choosing of quantity thereof are all to make push pedal obtain maximum density, improve cold crushing strength and the heat resistanceheat resistant stability of push pedal, meet raw material for refractory grating principle.
In addition, the correlation step in push pedal preparation method of the present invention and the setting of parameter also quite important, such as: stirring velocity, churning time, the mud stone roller/mixed grind time, compacting pressure, firing temperature time etc.These data are that we draw to have outstanding substantive distinguishing features by the summary of countless analysis of experimentss, achieve useful progress.
Table 1: molochite adds the 1500 DEG C × 6h in front and back and burns till push pedal physicals contrast table (mean value)
Wherein, molochite 1 for principal crystalline phase be mullite, free SiO
2for the molochite of cristobalite; Molochite 2 for principal crystalline phase be mullite, free SiO
2with the molochite that glassy form exists, purchased from French Da Mu Rake company.
Embodiment 1:
Formula for a product: fused mullite is 3 parts of 3-1mm, 2 parts of 1-0.5mm and 2 part 0.5-0.1mm; Fused white corundum is below 1.5 part of 200 order; Free SiO
2molochite in vitreous state is below 1 part of 200 order, Guangxi bonding clay 0.5 part.
Production technique:
(1) preparation of premix: take fused white corundum, free SiO by said ratio
2molochite in vitreous state and Guangxi bonding clay, for subsequent use after being uniformly mixed; Wherein, stirring carries out in taper stirring mixer, and churning time is 40 turns/min, and churning time is 1.5h.
(2) preparation of compound: take fused mullite according to the above ratio, adds premix and water successively, then mixed grind discharging after mud grinds; Described mud grinds and mixed grind is carried out in planetary mud stone roller mixing machine, and it is 5 minutes that mud grinds the time, and the mixed grind time is 25 minutes; The add-on of described water is 0.3 part.
(3) blank forming: compound compression moulding under 290Mpa condition is obtained base substrate;
(4) dry: base substrate is dried to residual moisture lower than 0.5%;
(5) burn till: base substrate burns till 6h through 1500 DEG C and namely obtains the push pedal of magneticsubstance calcining kiln.
Embodiment 2:
Formula for a product: fused mullite is 6 parts of 0.1-3mm; Fused white corundum is below 1 part of 325 order; Free SiO
2molochite in vitreous state is below 0.5 part of 200 order, common bonding clay 0.3 part.
According to the method steps revision test of embodiment 1, but churning time is 30 turns/min, and churning time is 1h; Particulate material mixing time is 6 minutes, and after adding Preblend and water, the mixed grind time is 30 minutes; The add-on of described water is 0.5 part; The pressure of blank forming is 320Mpa; Base substrate firing temperature is 1500 DEG C, and firing time is 5 hours.
Embodiment 3:
Formula for a product: fused mullite is 8 parts of 0.1-2mm; Fused white corundum is below 2 part of 200 order; Free SiO
2molochite in vitreous state is below 2 part of 150 order, Guangxi bonding clay 0.6 part.
According to the method steps revision test of embodiment 1, but churning time is 35 turns/min, and churning time is 1.2h; Particulate material mixing time is 5.5 minutes, and after adding Preblend and water, the mixed grind time is 38 minutes; The add-on of described water is 0.4 part; The pressure of blank forming is 300Mpa; Base substrate firing temperature is 1550 DEG C, and firing time is 5.5 hours.
Embodiment 4:
Formula for a product: fused mullite is 2 parts of 3-1mm, 3 parts of 1-0.5mm and 2 part 0.5-0.1mm; Fused white corundum is below below 0.5 part of 200 order, 1 part of 325 order and below 0.5 part of 150 order; Free SiO
2molochite in vitreous state is below 1.8 part of 200 order, Guangxi bonding clay 0.5 part.
According to the method steps revision test of embodiment 1.
Performance test is carried out in the push pedal obtained to above-described embodiment, the results are shown in Table 2.
Table 2 obtains the physicals contrast table of push pedal for embodiment 1-4
Claims (8)
1. a magneticsubstance calcining kiln push pedal, is characterized in that the component comprising following weight part:
2. magneticsubstance calcining kiln push pedal according to claim 1, is characterized in that: described fused mullite is 3-1mm3 part, 1-0.5mm2 part, 0.5-0.1mm2 part.
3. magneticsubstance calcining kiln push pedal according to claim 1, is characterized in that: described free SiO
2the granularity of the molochite in vitreous state is below 200 orders.
4. magneticsubstance calcining kiln push pedal according to claim 1, is characterized in that: described fused white corundum is 1.5 parts, below 200 orders.
5. magneticsubstance calcining kiln push pedal according to claim 1, is characterized in that: described bonding clay is Guangxi bonding clay.
6. a preparation method for magneticsubstance calcining kiln push pedal, is characterized in that comprising the steps:
(1) preparation of premix: take the following fused white corundum of 1-2 part 200 order, 0.5-2 part dissociates SiO
2molochite in vitreous state and 0.3-0.6 part bonding clay, for subsequent use after being uniformly mixed;
(2) preparation of compound: take 6-8 part 3-0.1mm fused mullite, adds premix and water successively, then mixed grind discharging after mixing;
(3) blank forming: compound compression moulding under 290-320MPa condition is obtained base substrate;
(4) dry: base substrate is dried to residual moisture lower than 0.5%;
(5) burn till: base substrate burns till 5-6h through 1500-1600 DEG C and namely obtains the push pedal of magneticsubstance calcining kiln.
7. the preparation method of magneticsubstance calcining kiln push pedal according to claim 6, is characterized in that: in step (1), and described stirring carries out in taper stirring mixer, and stirring velocity controls to turn/min at 30-40, and churning time is 1-1.5h.
8. the preparation method of magneticsubstance calcining kiln push pedal according to claim 6, it is characterized in that: in step (2), the mixing time of described fused mullite is 5-6min, amount of water is 0.3-0.5 part, the mixed grind time is 25-30 minute, and described mixed grind is ground in mixing machine at planetary mud and carried out.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1303834A (en) * | 1999-11-22 | 2001-07-18 | 冶金工业部洛阳耐火材料研究院 | Corundum-mullite product |
| CN103664153A (en) * | 2013-12-11 | 2014-03-26 | 长兴宏业高科高温耐火材料有限公司 | High temperature creep resistant mullite-cordierite product and preparation method thereof |
-
2014
- 2014-05-04 CN CN201410183326.2A patent/CN103964868B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1303834A (en) * | 1999-11-22 | 2001-07-18 | 冶金工业部洛阳耐火材料研究院 | Corundum-mullite product |
| CN103664153A (en) * | 2013-12-11 | 2014-03-26 | 长兴宏业高科高温耐火材料有限公司 | High temperature creep resistant mullite-cordierite product and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 莫来石-高硅氧玻璃复相材料的研制;李红霞等;《耐火材料》;19971231;第31卷(第1期);第16页左栏第1段，右栏第1-2段，第17页左栏第2段及第18页右栏第1段 * |
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