CN101334238A - Undersintering baking method for intermittent type operating intermediate frequency furnace quartz crucible - Google Patents
Undersintering baking method for intermittent type operating intermediate frequency furnace quartz crucible Download PDFInfo
- Publication number
- CN101334238A CN101334238A CNA2008100737239A CN200810073723A CN101334238A CN 101334238 A CN101334238 A CN 101334238A CN A2008100737239 A CNA2008100737239 A CN A2008100737239A CN 200810073723 A CN200810073723 A CN 200810073723A CN 101334238 A CN101334238 A CN 101334238A
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- China
- Prior art keywords
- furnace
- crucible
- undersintering
- intermediate frequency
- sintering
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 title abstract description 9
- 239000010453 quartz Substances 0.000 title abstract 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 46
- 229910052742 iron Inorganic materials 0.000 claims abstract description 23
- 239000000377 silicon dioxide Substances 0.000 claims description 8
- 238000001035 drying Methods 0.000 claims description 5
- 230000000737 periodic effect Effects 0.000 claims description 3
- 238000010792 warming Methods 0.000 claims description 2
- 238000005245 sintering Methods 0.000 abstract description 16
- 239000007788 liquid Substances 0.000 abstract description 4
- 229910021491 α-tridymite Inorganic materials 0.000 abstract description 2
- 230000002035 prolonged effect Effects 0.000 abstract 2
- 238000002156 mixing Methods 0.000 abstract 1
- 238000009413 insulation Methods 0.000 description 7
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 3
- 229910000805 Pig iron Inorganic materials 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 229910052698 phosphorus Inorganic materials 0.000 description 3
- 239000011574 phosphorus Substances 0.000 description 3
- 239000004411 aluminium Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000008646 thermal stress Effects 0.000 description 2
- 239000006004 Quartz sand Substances 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 239000010425 asbestos Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000006063 cullet Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 229910052895 riebeckite Inorganic materials 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
Landscapes
- Compositions Of Oxide Ceramics (AREA)
Abstract
The invention discloses a method for an undersintering furnace baking method of an intermittent type operating intermediate frequency furnace quartz crucible. When the furnace baking operation is performed after the ramming of the crucible, the high temperature sintering step that the furnace is heated to 1550 DEG C and the temperature of the furnace is kept for 2 hours is not executed after the blending iron is added and melted at the high temperature stage of the baking furnace and the temperature is raised to 1450 DEG C, and the molten iron is directly discharged. Because the step of fully high temperature sintering is not adopted, the rate that the Alpha-tridymite is converted into the Alpha-crystobalite can be effectively reduced, the thickness of the sintering layer is reduced, the thickness of the semi-sintering layer and the non-sintering layer is increased, the stress caused by the frequent furnace start-up and shut-down is effectively dispersed and the liquid iron leakage is prevented, and the service life of the crucible is prolonged. The furnace life of the intermittent type operating intermediate frequency furnace can be prolonged by more than 40 times by adopting the crucible undersintering furnace baking process.
Description
Technical field
The present invention relates to the production run technology of a kind of aluminium, especially a kind of periodic running aluminium baker sintering method of phosphorus pig iron melting intermediate frequency furnace silica crucible with phosphorus pig iron smelting furnace.
Background technology
When the intermediate frequency furnace that adopts silica crucible carries out the fusing of the phosphorus pig iron, silica crucible since be subjected to high-temperature metal directly wash away and heat repeatedly, the influence of factor such as cooling, more easily crack and need brickwork again, thereby improved production cost greatly, thereby each factory all pays much attention to the service life that prolongs crucible all the time.And the baker sintering quality behind the silica crucible brickwork is to influence the silica crucible key in service life.Baker sintering for silica crucible, prior art generally adopts " high temperature sintering " technology, the characteristics of high-sintering process are for after adding the fusing of batching iron and being warmed up to 1450 ℃ at the baker hot stage, molten iron temperature is continued to be raised to 1550 ℃ and be incubated 2 hours, so that crucible abundant sintering fast." high temperature sintering " technology drying out curve such as table 1.This technology is comparatively suitable for the crucible of continuous operation, and it is more than needed for production capacity, need the crucible of intermittent duty, prove through application practice, result of use is relatively poor, can not solve the frequent start-stop furnace zone well and come thermal shock crack, pot life is low, and general operation then needs brickwork again less than 80 stoves.
Table 1 " high temperature sintering " roast technic
| Time period (hour) | Temperature (℃) | Heating rate (℃/h) | The baker process | With the desired value temperature difference (℃) |
| 0-7 | 20-200 | 26 | Heat up | ±30 |
| 7-10 | 200-200 | 0 | Insulation | ±20 |
| 10-15 | 200-600 | 80 | Heat up | ±30 |
| 15-19 | 600-600 | 0 | Insulation | ±20 |
| 19-25 | 600-900 | 50 | Heat up | ±30 |
| 25-28 | 900-900 | 0 | Insulation | ±20 |
| 28-30 | 900-1150 | 125 | Heat up | ±30 |
| 30-30.5 | 1150-950 | -400 | Add batching iron | ±80 |
| 30-33 | 950-1450 | 167 | Fusing batching iron | ±30 |
| 33-34 | 1450-1550 | 100 | Heat up | ±30 |
| 34-36 | 1550-1550 | 0 | Insulation | ±20 |
| 36-37 | 1550-1400 | -150 | Cooling | ±30 |
| 37- | 1400-1400 | 0 | Be incubated, go out molten iron | ±50 |
Summary of the invention
The invention provides a kind of undersintering furnace drying method of quartz sand crucible, its crucible that has solved intermittent duty well is owing to frequent start-stop, and crucible is subjected to rapid heat cycle and produces the difficult problem that the weak point in service life is impacted and caused to thermal stress.
The technical solution adopted in the present invention is:
Crucible undersintering during baker is when promptly carrying out the baker operation, after the baker hot stage adds the fusing of batching iron behind the crucible brickwork, after being warming up to out 1450 ℃ of molten iron temperatures, do not carry out high temperature sintering step, but directly go out molten iron " furnace temperature is heated to 1550 ℃, and is incubated 2 hours ".Owing to do not adopt the abundant sintering step of high temperature, can reduce the ratio that α-tridymite is converted into α-Fang Shiying (1470 ℃) effectively, reduce the thickness of sinter layer, increase by half sinter layer and the thickness of sinter layer not, disperse the next stress in frequent start-stop furnace zone effectively and stop iron liquid seepage, prolong the service life of crucible.Crucible undersintering technology drying out curve such as table 2.
Table 2 " undersintering " roast technic
| Time period (hour) | Temperature (℃) | Heating rate (℃/h) | The baker process | With the desired value temperature difference (℃) |
| 0-7 | 20-200 | 26 | Heat up | ±30 |
| 7-10 | 200-200 | 0 | Insulation | ±20 |
| 10-15 | 200-600 | 80 | Heat up | ±30 |
| 15-19 | 600-600 | 0 | Insulation | ±20 |
| 19-25 | 600-900 | 50 | Heat up | ±30 |
| 25-28 | 900-900 | 0 | Insulation | ±20 |
| 28-30 | 900-1150 | 125 | Heat up | ±30 |
| 30-30.5 | 1150-950 | -400 | Add batching iron | ±80 |
| 30-33 | 950-1450 | 167 | Fusing batching iron | ±30 |
| 33- | 1450-1450 | 0 | Be incubated, go out molten iron | ±50 |
The invention has the beneficial effects as follows: the crucible that has solved intermittent duty well is owing to frequent start-stop, and crucible is subjected to rapid heat cycle and produces the difficult problem that the weak point in service life is impacted and caused to thermal stress.For the crucible of intermittent duty, adopt the undersintering roast technic can prolong more than furnace life 40 stove.
Specific implementation method
After the intermediate frequency furnace liner is built, thermocouple imbedded in the stove (do not contact furnace lining) to carry out thermometric, cover fire door with asbestos board, start stove, with low-power continuously or forfeit electricity and heat up by the baker system guaranteeing, when furnace temperature reaches 1150 ℃ of left and right sides, the dry furnace charge of the cleaning of packing into the iron of promptly preparing burden, with high power furnace charge is entered intensification by heating curve, fusing, the addition of furnace charge should be able to guarantee that the iron hydroful is beneficial to the sintering of fire door to fire door in the stove, when iron liquid in the stove melts when complete, the cullet that add 0.05% (mass percent), the iron liquid temp goes out molten iron in the control stove when 1450 ℃ of left and right sides.
Claims (1)
1, a kind of undersintering furnace drying method of periodic running intermediate frequency furnace silica crucible is characterized in that: crucible undersintering during baker, that is: add after the fusing of batching iron is warming up to out 1450 ℃ of molten iron temperatures at baker, and directly go out molten iron.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100737239A CN101334238A (en) | 2008-08-06 | 2008-08-06 | Undersintering baking method for intermittent type operating intermediate frequency furnace quartz crucible |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100737239A CN101334238A (en) | 2008-08-06 | 2008-08-06 | Undersintering baking method for intermittent type operating intermediate frequency furnace quartz crucible |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101334238A true CN101334238A (en) | 2008-12-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008100737239A Pending CN101334238A (en) | 2008-08-06 | 2008-08-06 | Undersintering baking method for intermittent type operating intermediate frequency furnace quartz crucible |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101334238A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102732675A (en) * | 2012-06-08 | 2012-10-17 | 振石集团东方特钢股份有限公司 | Furnace baking method for new intermediate frequency furnace |
| CN102798292A (en) * | 2012-09-10 | 2012-11-28 | 江西稀有稀土金属钨业集团有限公司 | Method for baking vacuum induction melting furnace |
| CN103509905A (en) * | 2013-09-28 | 2014-01-15 | 登封电厂集团铝合金有限公司 | Improved smelting process for phosphorus-containing pig iron |
| CN114216334A (en) * | 2021-12-20 | 2022-03-22 | 广东韶钢松山股份有限公司 | Intermediate frequency induction smelting furnace and baking method thereof |
-
2008
- 2008-08-06 CN CNA2008100737239A patent/CN101334238A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102732675A (en) * | 2012-06-08 | 2012-10-17 | 振石集团东方特钢股份有限公司 | Furnace baking method for new intermediate frequency furnace |
| CN102798292A (en) * | 2012-09-10 | 2012-11-28 | 江西稀有稀土金属钨业集团有限公司 | Method for baking vacuum induction melting furnace |
| CN103509905A (en) * | 2013-09-28 | 2014-01-15 | 登封电厂集团铝合金有限公司 | Improved smelting process for phosphorus-containing pig iron |
| CN114216334A (en) * | 2021-12-20 | 2022-03-22 | 广东韶钢松山股份有限公司 | Intermediate frequency induction smelting furnace and baking method thereof |
| CN114216334B (en) * | 2021-12-20 | 2023-10-31 | 广东韶钢松山股份有限公司 | Medium frequency induction smelting furnace and baking method thereof |
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| C12 | Rejection of a patent application after its publication | ||
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Open date: 20081231 |