CN1036355C - Material used as bottom of sinering furnace - Google Patents
Material used as bottom of sinering furnace Download PDFInfo
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- CN1036355C CN1036355C CN92100944A CN92100944A CN1036355C CN 1036355 C CN1036355 C CN 1036355C CN 92100944 A CN92100944 A CN 92100944A CN 92100944 A CN92100944 A CN 92100944A CN 1036355 C CN1036355 C CN 1036355C
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- furnace
- mgo
- sand
- sintering
- cao
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- Compositions Of Oxide Ceramics (AREA)
- Furnace Housings, Linings, Walls, And Ceilings (AREA)
Abstract
The present invention provides a new material for sintering the bottom of a steel-smelting furnace, which mainly adopts a technical line with high purity and high density. The material contains 90 to 94% of MgO, less than 1% of CaO/SiO2 and little content of Al2O3, Fe2O3, CaO, etc., has reasonable granularity without any binding agent or mineralizing agent, and is sintered under high temperature in a cold laid method. The material overcomes the deficiency of the prior art and has the advantages of simple manufacturing technique, low cost and more than 3 times of service life than that of synthetic sand so that the present invention is a kind of new material with good prospect for protecting the furnace.
Description
A kind ofly be used for agglomerated material at the bottom of the converter.
As everyone knows, the open hearth furnace bottom sintered layer is with being subjected to steelmaking process mechanical shock, variations in temperature, significant points such as chemical erosion.Therefore, no matter be domestic or external, always the research of furnace hearth material is considered as key technology and constantly studies and inquire into.Common more satisfactory open hearth furnace bottom working surface, should with MgO main component, and even structure, fine and close magnesia sinter layer, impact when just being enough to bear open hearth and adding cold burden and be unlikely to sinter layer is punctured, and guarantee in smelting process, to have certain chemical resistance of concrete ability.React because furnace bottom participates in smelting, so wish furnace bottom one side corrode lentamente, be sintered to whole behavior on the one hand from top to bottom with the thermograde development, make after each smelting cycle end, furnace bottom can form a new solid shell again.
U.S. Patent number is the refractory material that US4168177 discloses a kind of spray repair stove.This kind material is the particle that used BOF backup lining brick is processed into the MgO refractory material, adds 2～14% binder making again and forms, and its composition is listed following table in:
| Component | Optimal value (weight %) | Approximate range (weight %) |
| MgO | 90 | 78～97 |
| Anhydrous sodium metasilicate | 3 | 1～7 |
| Aqueous sodium carbonate is arranged | 3 | 1～7 |
| The sodium bentonite | 4 | 1～8 |
The characteristics of this material are to have good adhesion strength---the recovery of minimum and higher intensity.But it is the refractory material that a kind of more satisfactory gunning is used.
For many years, following mode has been taked in furnace bottom sintered layer technical research aspect:
1. knotting furnace bottom.Though the knotting life of bottom is very long, it is more to waste time;
2. at the bottom of the sintering furnace.Be the destroyed back of furnace bottom sintered layer (about about 30 stoves), furnace material heat is spread, carry out high temperature sintering with the thermic load of maximum.
3. the research of sintering bearth material.The alkaline open-hearth furnace agglomerated material is generally all molten admittedly with magnesia and iron scale, forms good sinter layer, and the life-span is 20～30 times.Its shortcoming is:
1. because sinter layer MgO content is low, along with the increase of iron sheet addition, fire resistance reduces, and causes the furnace bottom sintered layer life-span shorter.
2. dangerous, labour intensity is big.
3. furnace rate height, operating rate descends, and output of steel reduces thereupon, and refractory consumption rate increases.
Several furnace material prescriptions are listed table 1 in:
Now the synthetic sand of using at the bottom of the sintering furnace and its sintering mechanism of synthesized high iron sand mainly are to utilize the generation acceleration of sintering of infinitely solid molten and other eutectic mineral of iron magnesium.Therefore, the sinter layer fire resistance is low, and slag resistance is poor, easy sintering and being etched, and furnace bottom is up to about 30 times service life.
In order to overcome the deficiencies in the prior art, prolong the life of bottom, the invention provides a kind of high-purity, high density (being called for short two high sand), use new material at the bottom of the strong sintering furnace of resistance to slag and abrasion resistance.
The present invention has chosen high-purity, highdensity technology path, and its MgO content is up to 90～94%, CaO/SiO
2＜1, Al
2O
3, Fe
2O
3, component content such as CaO is less, need not add any binding agent or mineralizer, only with self rational chemical, reasonably particle is formed.High density, specific area is big, sintering activity degree height, current with the high temperature of oxygen steel-making under (＞1650 ℃), generates an amount of liquid phase and just is being suitable for the periclase growth and grows up and impel burning in.The furnace bottom of this material sintering is to be oikocryst with the high periclase of refractoriness, a spot of (about 10%) silicate liquid phase is the periclase crystal grain that the very big glue of viscosity is wrapped in, make the sintering integrated of whole furnace bottom densification, not only high temperature resistant resistance to slag but also good prolongs furnace bottom service life.
The composition range of two high sand is following table for example:
| Composition | Approximate range (weight %) | Optimal value (weight %) |
| MgO | 90～94 | 92 |
| SiO 2 | ≤4.0 | ＜3.5 |
| Fe 2O 3 | ≤2.0 | ＜2.0 |
| CaO | ≤2.0 | ＜2.0 |
| Al 2O 3 | ≤1.0 | ＜1.0 |
| Igloss | ≤0.5 | ＜0.4 |
The raw material of two high sand is selected.In order to obtain the sinter layer of anti-molten steel, slag erosion and erosion, must choose raw material with higher fire resistance.Through test of many times, finally having selected MgO content is primary raw material up to about 90～94% electric smelting skin sand.Because electric smelting skin sand MgO content height, impurity is few, and magnesite is through the electric smelting calcination, and himself basicity is 0.49.From lithofacies analysis, low melting point mutually seldom particularly loses CF, C
2The appearance of F.Therefore, sintering under 1650～1750 ℃ of high temperature can obtain the refractoriness height, at the bottom of the good sintering furnace of resistance to slag.
The particle compositing range of two high sand is as follows:
| Granularity (mm) | Approximate range (%) | Optimal value (%) |
| 10～5 | 5～10 | 8 |
| 5～1 | 40～50 | 46 |
| Granularity (mm) | Approximate range (%) | Optimal value (%) |
| 1～0.088 | 15～25 | 22 |
| ≤0.088 | 15～30 | 24 |
Magnesia is through after fragmentation, pulverizing, and its particle all is a polygon not of uniform size, that corner angle are uneven.Therefore, reasonably select particle also particularly important.Because the bulk density of magnesia is big, according to blending powder in the table, no matter be macroscopic view, it all is fine and close still examining under a microscope its institutional framework.
The manufacturing process of two high sand is comparatively simple, and it is also few to produce equipment needed thereby.Select the skin sand of fused magnesite for use, remove through selecting materials and do not protected sand and base protects sand by the crust of clinkering, again through broken, pulverize, sieve and prepare burden by the particle composition requirement, puddle at last evenly, just become novel furnace retaining magnesia.
According to above-mentioned prescription and manufacturing process, on the tandem furnace of Anshan Iron and Steel Works II and tilting open hearth furnace, test, all produce a desired effect.
During application,, before blowing out, carry out shoddye, blow off dust on the masonry with compressed air to the molten bath in order to prevent the pollution of residue in the stove, residual steel to two high sand, and with moistening brick masonary of bittern and sinter layer.Be minimum point with the tapping hole center line during cold-application, symmetry is completed the type of furnace.The door burner hearth is spread about 250mm in general.In addition,,, will be mixed with the two high sand of 4～5% bittern on the top of front-back wall and levee slope for increasing adhesive force, after stirring with the groove button and make real.After furnace bottom is completed, carry out baker by heating cycle, and at the bottom of the sintering furnace.
The present invention has overcome the deficiencies in the prior art, has received good effect.Use on tandem furnace, its average life span is 159 times, is up to three stove labour, smelts not furnace of 431 stoves; Use on 300t tilting-type oxygen blast open hearth, its effect improves more than 3 times than synthetic sand, remarkable in economical benefits.The two high sand of evidence become component selections reasonable, and particle size range is suitable, and manufacturing process is simple, is a kind of rising furnace retaining new material.
| Chemical composition % | Al 2O 3+SiO 2 | Fe 2O 3 | CaO | MgO | Natural particle size (mm) |
| Fettling magnesite grain | 5～6 | — | 8～12 | 78～83 | 0～5 |
| Synthetic sand | ≤3 | ≥9 | 8～10 | ≤80 | 0～5 |
| Synthetic sand+iron sheet | ≤3 | 24～26 | 8～10 | 60～64 | 0～3 |
| High magnesium synthetic sand | ≤3 | 18～20 | 8～10 | 70 | 0～3 |
| The high ferro synthetic sand | ≤3 | 23～28 | 8～10 | 58～65 | 0～3 |
Claims (1)
1. using new material at the bottom of a converter, is main component with MgO, it is characterized in that: the MgO component content is up to 90～94%, CaO/SiO
2＜1, need not add any binding agent or mineralizer, form through the cold-application high temperature sintering, its composition range is (weight %): MgO 90～94, SiO
2≤ 4.0, Fe
2O
3≤ 2.0, Al
2O
3≤ 1.0, igloss≤0.5, all the other are impurity, its granulometric range is:
Granularity (mm) 10～5 5～1 1～0.088 ≤0.088
Scope (%) 5～10 40～50 15～25 15～30
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN92100944A CN1036355C (en) | 1992-02-13 | 1992-02-13 | Material used as bottom of sinering furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN92100944A CN1036355C (en) | 1992-02-13 | 1992-02-13 | Material used as bottom of sinering furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1064147A CN1064147A (en) | 1992-09-02 |
| CN1036355C true CN1036355C (en) | 1997-11-05 |
Family
ID=4938894
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN92100944A Expired - Fee Related CN1036355C (en) | 1992-02-13 | 1992-02-13 | Material used as bottom of sinering furnace |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1036355C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012201528A (en) * | 2011-03-24 | 2012-10-22 | Tateho Chemical Industries Co Ltd | Method for producing magnesium oxide sintered body |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4168177A (en) * | 1977-04-04 | 1979-09-18 | Bethlehem Steel Corporation | Refractory gunning composition |
-
1992
- 1992-02-13 CN CN92100944A patent/CN1036355C/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4168177A (en) * | 1977-04-04 | 1979-09-18 | Bethlehem Steel Corporation | Refractory gunning composition |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1064147A (en) | 1992-09-02 |
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