CN102070328A - Production method of sintered brown corundum - Google Patents
Production method of sintered brown corundum Download PDFInfo
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- CN102070328A CN102070328A CN 201010587514 CN201010587514A CN102070328A CN 102070328 A CN102070328 A CN 102070328A CN 201010587514 CN201010587514 CN 201010587514 CN 201010587514 A CN201010587514 A CN 201010587514A CN 102070328 A CN102070328 A CN 102070328A
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Abstract
The invention relates to a production method of sintered brown corundum. The method comprises the following steps: adding 50-60wt% of alumina and 40-50wt% of bauxite raw ore in a container, then adding water, poly-AlCl3 and lignocellulose, then sealing and grinding to obtain slurry; and dewatering the slurry, forming, drying and calcining to obtain the sintered brown corundum, wherein the weight percentages of water, poly-AlCl3 and lignocellulose to the total weight of alumina and bauxite raw ore are separately 30-40%, 0.2-0.5% and 0.1-0.3%; and the content of Al2O3 in bauxite raw ore is no less than 75%. The brown corundum prepared by the method of the invention does not have residual carbon, has high mechanical strength, low production cost and good operational performance and can not crack.
Description
Technical field
The invention belongs to the refractory raw material production field, be specifically related to a kind of production method of sintering brown fused alumina.
Background technology
The palm fibre corundum, popular name claims silicon carbide again, its color is a brown, is widely used in making industries such as high grade refractory, pottery, grinding tool abrasive material, casting.At present, palm fibre corundum production method commonly used is to adopt the electric smelting method, promptly in electric furnace, get (the brown corundum that makes is called fused brown corundum) through melting reduction by three kinds of raw materials such as alumina, carbon element, iron filings, owing to added carbon element in its production process, make that residual carbon content is about 0.5% in its finished product.The user is easy to generate efflorescence, explosion phenomenon when using fused brown corundum, thereby reduces its use properties.Simultaneously, again because its production method is to utilize electric furnace to melt reduction, consumed a large amount of electric energy (power consumption account for its cost about 50%), in the face of the crunch of energy-saving and emission-reduction, a kind of type material of market in urgent need substitutes fused brown corundum.
Summary of the invention
The object of the invention is to provide a kind of novel process of sintering brown fused alumina, and carbon containing is not residual for prepared brown corundum, and cost is lower, and use properties is good.
For achieving the above object, the present invention adopts following technical scheme.
A kind of production technique of sintering brown fused alumina may further comprise the steps:
Add 50～60% aluminum oxide and 40～50% bauxitic clay rawores by weight percentage in container successively, adding accounts for the water of both weight sums 30～40%, 0.2～0.5% polymerization AlCl again
3, 0.1～0.3% lignocellulose, then sealing grind mud; With mud through dehydration, moulding, drying, calcine sintering brown fused alumina; Al in the described bauxitic clay rawore
2O
3Weight content 〉=75%.
Described container is a ball mill by wet process.
Described sealing milling time is 8～10h.
Described dehydration, moulding, drying step are: pump slurry in the mud press dehydration (5～15min) mud cake; With mud cake through de-airing extruder (vacuum tightness be 0.07～0.2Mpa) push and cut moulded pottery not yet put in a kiln to bake; Moulded pottery not yet put in a kiln to bake is delivered to dry (100～200 ℃ of dryings 8～12h) in the dry kiln.
Described calcining is in 1600～1700 ℃ of calcining 3～5h in tunnel furnace.
The production method of above-mentioned sintering brown fused alumina preferably includes following steps:
Add 50～60% aluminum oxide and 40～50% bauxitic clay rawores by weight percentage in ball mill by wet process successively, adding accounts for the water of both weight sums 30～40%, 0.3～0.5% polymerization AlCl again
3, 0.1～0.3% lignocellulose, sealing is ground 8～10h and is got mud then, pump slurry into the 5～15min that dewaters in the mud press and get mud cake, with mud cake through vacuum tightness be the de-airing extruder extruding of 0.07～0.2Mpa and cut moulded pottery not yet put in a kiln to bake, moulded pottery not yet put in a kiln to bake is delivered in the dry kiln in 100～200 ℃ of drying 8～12h, in tunnel furnace, got sintering brown fused alumina then in 1600～1700 ℃ of calcining 3～5h.
Beneficial effect of the present invention:
Replace electric smelting prepared palm fibre corundum with sintering process, carbon containing is not residual for the brown corundum of production gained, the physical strength height, and not efflorescence, not explosion, use properties is good; Greatly reduce power consumption (power consumption reduces nearly 90%) simultaneously.Although it is long to adopt sintering process to produce brown corundum operational path, used commercial alumina cost is higher, but because power consumption cost reduces greatly, its comprehensive cost still is lower than the production cost (about 500 yuan of saving per ton) of electric smelting method palm fibre corundum, and therefore can substitute fused brown corundum fully is used for refractory industry.In addition, the sintering brown fused alumina performance index that adopt the inventive method to make see table 1 for details, and concrete detection method is referring to GB GB/T3043-2000.
As can be seen from Table 1, every index of sintering brown fused alumina and fused brown corundum is roughly the same, but the TiO of sintering brown fused alumina
2Be starkly lower than fused brown corundum with carbon content, wherein the sintering brown fused alumina carbon content is zero.The comprehensive production cost of sintering brown fused alumina is 70% of a fused brown corundum only, so the former is better than the latter.
Embodiment
The present invention is described further by the following examples, but protection scope of the present invention is not limited thereto.
Embodiment 1
A kind of production method of sintering brown fused alumina may further comprise the steps: add 50% aluminum oxide and 50% bauxitic clay rawore by weight percentage in ball mill by wet process successively, adding accounts for the water of both weight sums 30%, 0.5% polymerization AlCl again
3, 0.1% lignocellulose, sealing is ground 8h and is got mud then, pump slurry into the 15min that dewaters in the mud press and get mud cake, with mud cake through vacuum tightness be the de-airing extruder extruding of 0.07Mpa and cut moulded pottery not yet put in a kiln to bake, moulded pottery not yet put in a kiln to bake is delivered in the dry kiln in 100 ℃ of dry 12h, in tunnel furnace, got sintering brown fused alumina then in 1600 ℃ of calcining 5h.
Embodiment 2
A kind of production method of sintering brown fused alumina may further comprise the steps: add 60% aluminum oxide and 40% bauxitic clay rawore by weight percentage in ball mill by wet process successively, adding accounts for the water of both weight sums 40%, 0.3% polymerization AlCl again
3, 0.3% lignocellulose, sealing is ground 10h and is got mud then, pump slurry into the 5min that dewaters in the mud press and get mud cake, with mud cake through vacuum tightness be the de-airing extruder extruding of 0.2Mpa and cut moulded pottery not yet put in a kiln to bake, moulded pottery not yet put in a kiln to bake is delivered in the dry kiln in 200 ℃ of dry 8h, in tunnel furnace, got sintering brown fused alumina then in 1700 ℃ of calcining 3h.
Embodiment 3
A kind of production method of sintering brown fused alumina may further comprise the steps: add 55% aluminum oxide and 45% bauxitic clay rawore by weight percentage in ball mill by wet process successively, adding accounts for the water of both weight sums 35%, 0.4% polymerization AlCl again
3, 0.2% lignocellulose, sealing is ground 9h and is got mud then, pump slurry into the 10min that dewaters in the mud press and get mud cake, with mud cake through vacuum tightness be the de-airing extruder extruding of 0.1Mpa and cut moulded pottery not yet put in a kiln to bake, moulded pottery not yet put in a kiln to bake is delivered in the dry kiln in 150 ℃ of dry 9h, in tunnel furnace, got sintering brown fused alumina then in 1650 ℃ of calcining 4h.
The sintering brown fused alumina physical strength that above-mentioned three embodiment make is a Mohs' hardness 9; Peng's coefficient (20～900 ℃ time) that expands is 6.5; Volume density 〉=3.7g/cm
3And carbon containing not.
Claims (6)
1. the production method of a sintering brown fused alumina is characterized in that, may further comprise the steps:
Add 50～60% aluminum oxide and 40～50% bauxitic clay rawores by weight percentage in container successively, adding accounts for the water of both weight sums 30～40%, 0.2～0.5% polymerization AlCl again
3, 0.1～0.3% lignocellulose, then sealing grind mud; With mud through dehydration, moulding, drying, calcine sintering brown fused alumina; Al in the described bauxitic clay rawore
2O
3Content 〉=75%.
2. the production method of sintering brown fused alumina according to claim 1 is characterized in that described container is a ball mill by wet process.
3. the production method of sintering brown fused alumina according to claim 1 is characterized in that described sealing milling time is 8～10h.
4. the production method of sintering brown fused alumina according to claim 1 is characterized in that described dehydration, moulding, drying step are: pump slurry into dewater in the mud press mud cake; With mud cake through de-airing extruder extruding and cut moulded pottery not yet put in a kiln to bake; Deliver in the dry kiln moulded pottery not yet put in a kiln to bake dry.
As claim 1 to 4 arbitrary as described in the production method of sintering brown fused alumina, it is characterized in that described calcining is in 1600～1700 ℃ of calcining 3～5h in tunnel furnace.
6. the production method of sintering brown fused alumina according to claim 1 is characterized in that, may further comprise the steps:
Add 50～60% aluminum oxide and 40～50% bauxitic clay rawores by weight percentage in ball mill by wet process successively, adding accounts for the water of both weight sums 30～40%, 0.3～0.5% polymerization AlCl again
3, 0.1～0.3% lignocellulose, sealing is ground 8～10h and is got mud then, pump slurry into the 5～15min that dewaters in the mud press and get mud cake, with mud cake through vacuum tightness be the de-airing extruder extruding of 0.07～0.2Mpa and cut moulded pottery not yet put in a kiln to bake, moulded pottery not yet put in a kiln to bake is delivered in the dry kiln in 100～200 ℃ of drying 8～12h, in tunnel furnace, got sintering brown fused alumina then in 1600～1700 ℃ of calcining 3～5h.
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| CN 201010587514 CN102070328A (en) | 2010-12-15 | 2010-12-15 | Production method of sintered brown corundum |
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| CN 201010587514 CN102070328A (en) | 2010-12-15 | 2010-12-15 | Production method of sintered brown corundum |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103664144A (en) * | 2013-11-26 | 2014-03-26 | 河南容安热工新材料有限公司 | Wet production process of sintered alumina |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1261093A (en) * | 1999-01-15 | 2000-07-26 | 李霞 | Grinding body of brown corundum and preparing process thereof |
| CN101214985A (en) * | 2008-01-11 | 2008-07-09 | 陈宏亲 | Technique for preparing brown corundum |
| CN101260004A (en) * | 2008-04-15 | 2008-09-10 | 濮阳濮耐高温材料（集团）股份有限公司 | Method for producing sintering brown fused alumina |
| CN101555151A (en) * | 2009-05-25 | 2009-10-14 | 巩义市金岭耐火材料有限公司 | Corundum fireproof ball used for ball-type hot-blast stove and preparation method thereof |
-
2010
- 2010-12-15 CN CN 201010587514 patent/CN102070328A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1261093A (en) * | 1999-01-15 | 2000-07-26 | 李霞 | Grinding body of brown corundum and preparing process thereof |
| CN101214985A (en) * | 2008-01-11 | 2008-07-09 | 陈宏亲 | Technique for preparing brown corundum |
| CN101260004A (en) * | 2008-04-15 | 2008-09-10 | 濮阳濮耐高温材料（集团）股份有限公司 | Method for producing sintering brown fused alumina |
| CN101555151A (en) * | 2009-05-25 | 2009-10-14 | 巩义市金岭耐火材料有限公司 | Corundum fireproof ball used for ball-type hot-blast stove and preparation method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103664144A (en) * | 2013-11-26 | 2014-03-26 | 河南容安热工新材料有限公司 | Wet production process of sintered alumina |
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Application publication date: 20110525 |