CN1325435C - Chromium free refractory material for RH vacuum furnace lining - Google Patents
Chromium free refractory material for RH vacuum furnace lining Download PDFInfo
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- CN1325435C CN1325435C CNB2004100256372A CN200410025637A CN1325435C CN 1325435 C CN1325435 C CN 1325435C CN B2004100256372 A CNB2004100256372 A CN B2004100256372A CN 200410025637 A CN200410025637 A CN 200410025637A CN 1325435 C CN1325435 C CN 1325435C
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Abstract
The present invention relates to a chromium-free refractory material for an RH vacuum furnace liner, which comprises the following components (mass percentages): 88 to 97 percent of one or more than one magnesite sand or magnesium zircon sand or magnesium zircon silica sand, 1 to 6 percent of fine zirconia powder, 0 to 9 percent of fine zirconite powder, and 1 to 3 percent of an organic binding agent (additional). The chemical compositions (mass percentages) of the present invention are as follows: 80 to 90 percent of MgO, 1 to 4 percent of SiO, and 7 to 13 percent of ZrO2, wherein the organic binding agent is a binding agent, such as sodium humate, calcium lignosulphonate, dextrin and arabic gum, which is commonly used in refractory material industry. MgO-ZrO2-SiO2 of the present invention, which is a chromium-free refractory material, has preferable slag resistance relative to high-quality MgO-Cr2O3 bricks used for an RH lower groove and other existing RH chromium-free bricks, particularly the slag permeation resistance of the MgO-ZrO2-SiO2 is even obviously superior to a high-cost MgO-ZrO2 refractory material, and thereby, the MgO-ZrO2-SiO2 is of far reaching importance for eliminating peeling damage caused in the use of the RH vacuum smelting furnace liner to realize the long service life of the RH vacuum smelting furnace liner.
Description
Technical field
The present invention relates to fire resisting material field, particularly the anti-material of RH vacuum metling equipment furnace lining.
Background technology
The RH vacuum-treat is a kind of important flow process and the equipment in the external refining, and it is by the common design of German Rule (Ruhrstahl) company and extra large Rolls (Heraeus) company, so name RH method.The anti-material of RH vacuum refinement equipment furnace lining, the melting loss that need stand acutely the washing away of high-temperature molten steel, slag and molten steel in the use corrodes and intermittence is handled the intensive thermal shock damage process that molten steel stood, require material to have good anti-molten steel and scouring performance, good high-temperature intensity, simultaneously, also require material to have enough thermal shock resistances.Ultrahigh-temperature is burnt till magnesium chromium goods, because of having the premium properties of above-mentioned aspects preferably simultaneously concurrently, all be chosen as the only fire proof material of furnace lining of RH vacuum metling equipment in the past few decades all over the world, be still RH vacuum metling equipment at present and use the most general fire proof material of furnace lining.
Development along with Iron And Steel Industry, the continuous rising of high added value steel grade output, the production load of RH vacuum refinement equipment continues to increase, and functions of the equipments improve constantly, the lifting of functions of the equipments such as RH-OB, RH-KTB, RH-MFB is perfect, to the demands for higher performance of anti-material.In order to satisfy equipment to the raising that anti-material use properties requires, occurred with the fused magnesia-chrome be raw material directly in conjunction with magnesia chrome brick, the chromium content of magnesia chrome brick also is improved, thereby the erosion-resisting characteristics of material is further enhanced.
Magnesia chrome brick is also extensively selected the significant points refractory materials into working conditions harshness on the furnace lining for use for cement rotary kiln, glass melter, nonferrous smelting so far except that the secondary refining equipment of smelting iron and steel widely adopts.Yet because of the strategy of sustainable development in the global range is subjected to increasing attention, various countries have caused common attention to magnesia chrome brick production use and the environmental pollution that discarded residual lining causes.
Magnesia chrome brick produces high valence chrome in the high temperature use under alkaline condition, aggravate with the rising of temperature.Sexavalent chrome is to human carcinogen's material, anti-material ultrahigh-temperature burn till with alkaline condition under high temperature use in volatilization, useless anti-material is stacked in the landfill process and is dissolved in underground water source, and useless anti-material utilizes process mesometamorphism layer to separate discarded, the broken airborne dust of pulverizing in back all may cause this objectionable impurities diffusion and damage to the environment.
The anti-material development of Chrome-free in recent years is subjected to general attention.Particularly cement rotary kiln serves as a contrast in the anti-material magnesia-spinel brick and substitutes magnesia chrome brick and obtained extensively promoting and adopting, and has technically accumulated many successful experience.Steel secondary refining equipment furnace lining also constantly is seen in report with the pilot development of the anti-material of Chrome-free, but because of the difficulty height, mainly also is in testing laboratory's developing material and type approval test exploratory stage at present.From the research and development present situation, steel secondary refining equipment furnace lining mainly is the no chromaking of the anti-material of RH vacuum treatment device furnace lining, also need try to explore in the anti-material of the Chrome-free field of exploitation superior performance.
The anti-material of the Chrome-free of the anti-material of magnesium chromium as an alternative, what relate in the research and development has magnesium-aluminium spinel, magnesia spinel titanium, magnesia spinel zirconium, magnesium oxide-yttrium oxide, magnesium oxide-zirconium white, magnesium oxide-zircon and a magnesium carbonaceous.The material that is subjected to maximum attention is the anti-material of magnalium matter.Magnesium-aluminium spinel is owing to have similar fire performance with magnesia chrome spinel, and the fundamental characteristics of the two might form mutual alternate material.But, be that conjunctive tissue is difficult to prosperity, Al in the Mg-Al spinel brick in the magnesia spinel matter brick of raw material with high-purity synthetic spinel
2O
3Than Cr in the magnesia chrome brick
2O
3The speed of stripping is fast in slag, therefore, substitutes magnesia chrome brick with Mg-Al spinel brick or corundum spinelle mould material on the liquid steel refining furnace lining, easily causes the wearing quality of furnace lining to descend.Must improve raising to the slag resistance of this system material.
" ジ Le コ ニ ゥ system acidulants contain ァ Le ミ Na-マ グ ネ シ ァ Quality キ ャ ス Block Le refractory body and び refining of metal molten metal container " such as Japan's many Xides heros, JP2001302364 discloses in order to improve cement in conjunction with Al
2O
3The slag resistance of-MgO matter mould material also is used for the refining of metal container, to this Al
2O
3Zirconium white or zircon micropowder and very a spot of SiO have been introduced in-the MgO matter mould material
2, and 0.1% dispersion agent.Consisting of of material: Al
2O
3The 68-95% of (＜5mm), MgO 1-30%, ZrSiO
4+ ZrO
2(＜1 μ m) 0.1-5%, SiO
2(＜1 μ m) 0-0.7%, aluminous cement 8%.The adding of zirconium white or zircon micropowder is to improving cement in conjunction with Al
2O
3The slag resistance of-MgO matter mould material has some improvement, but effect is not remarkable.Carry out slagging of retractory test (CaO/SiO in 1600 ℃, slag in the laboratory
2=3.8), its anti-slag melting loss and slag penetration resistance can on average only improve about 10% than the magnesia mould material of primary aluminum, are obviously not enough with respect to the requirement of RH vacuum metling equipment furnace lining.
" two the smart And-chain マ ゲ ネ シ ァ ス ピ ネ Le Quality れ ん Ga development " that Teng Gu letter we deliver, " refractory body ", 1998, " the Shinagana TechnicalReport " that № 1.17～20, she Jian Ke The deliver, V01.41,1998,1～6, Teng Gu believes that I, Yi Dongke then wait and has used for reference cement kiln lining Chrome-free magnesia-spinel brick manufacturing technology in the literary composition, makes that crystal boundary contains small amount of Fe in the material structure
2O
3And TiO
2Promote in the materials microstructure prosperity in conjunction with phase, reach the purpose that improves corrosion-resistant property, by promoting in conjunction with growing mutually and using the technological approaches of electrosmelted magnesite clinker instead, improved the erosion-resisting characteristics of magnesium-aluminium spinel, obtained anti-low basicity slag erosion performance not as magnesia chrome brick, all more excellent Mg-Al spinel brick of other every performances, this development substitutes magnesia chrome brick on the RH soaking tub real stove test obtains the test effect equal with magnesia chrome brick.
The people such as the big rugged rich right side of technical institute of Krosaki Harima Corporation have carried out than systematic research magnalium titanium developing material, (the big rugged rich right side etc., " MgO-TiO
2-Al
2O
3Chrome-Free Bricksfor Vacuum Degassor ", Kurosaki is broadcast mill (strain) refractory materials will № 1 48 (2000)) find that this system material is at rational TiO
2/ Al
2O
3Ratio and certain TiO
2, Al
2O
3Under the resultant, can obtain to be equivalent to or to be better than the performance and the result of use of magnesium chromium material.Kai Fa MgO-TiO on this basis
2-Al2O
3Be that chromium-free brick carries out the real stove test of RH vacuum tank (Installation of Top-Burner), obtain and Cr
2O
3The suitable work-ing life of magnesia chrome brick of content 12.2% trade mark.
The U.S. Pat 3303032 " Magnesia-Zircon Refractories " of John P.Holt etc. discloses a kind of MgO-ZrO
2The anti-material patent of matter, this MgO-ZrO
2Material mainly accounts for 40-49% by 〉=70 purpose basic materials (be mainly magnesium oxide, also can be rhombspar, other basic oxide or oxyhydroxide) and≤50 purpose zircons account for the 10-60% composition.This material is used for ladle or high frequency furnace, can meet or exceed the result of use of magnesia or zircon brick, is used at the bottom of ladle long nozzle or the ladle, has surpassed magnesia, clay matter, clay-graphite material.
Space all weighs person of outstanding talent etc. and discloses a kind of MgO-ZrO that is used for the heat shock resistance of refining of metal furnace lining
2Brick, (space all weighs person of outstanding talent etc., and " anti-Hot dashes fire-resistant Refining watt of holding up property To The ぐ れ マ グ ネ シ ァ-ヅ Le コ ニ ァ Quality ", JP63060151), it adopts MgO and the non-stable ZrO of 0.3-2mm
2At the temperature lower calcination that is higher than more than 1650 ℃, can make astable ZrO behind the mixing moulding
2Change into and stablize ZrO
2, and wherein be uniform-distribution with little pore of 5-30 μ m, can significantly improve MgO-ZrO
2The heat-shock resistance of material.This MgO-ZrO
2The ingredient groups of material becomes: MgO 80-95%, ZrO
25-20%, wedding agent 2% (adding).(1400 ℃ high wind cold 15 minutes) carry out thermal shock resistance test under laboratory condition, and the heat-resisting spalling of patent is better than with magnesia brick that compares test under the condition and magnesia chrome brick.
" Taiyuan Iron and Steel Co. translation " also reported MgO-ZrO
2Brick and MgO-Y
2O
3Brick is as the exploratory experiment situation of RH vacuum deaerator plant inner lining material, and (" application of chromium-free brick in RH vacuum outgas kerve ", Yang Lizhi translates, 2003,2, P.24-26 " Taiyuan Iron and Steel Co. translation ") laboratory result shows MgO-ZrO
2The heat-resisting spalling resistance of brick is lower than MgO-Cr
2O
3Brick, and MgO-Y
2O
3Brick can be used as MgO-Cr
2O
3The substitute of brick has also been carried out real stove use-testing, but the MgO-Y of real according to one's analysis stove test
2O
3The residual sample of brick is thought MgO-Y
2O
3Brick still might chap and peel off.The document is not reported MgO-ZrO
2The composition of brick.
The above anti-material of various Chrome-frees, have because of slag resistance and still can not reach work-ing life and substitute of the requirement of RH vacuum oven furnace lining with the anti-material of magnesium chromium, although the performance that has may be near the anti-material of magnesium chromium, but production cost will be apparently higher than the anti-material of magnesium chromium, and this is the anti-material of Chrome-free substitutes the anti-material of magnesium chromium at present with being difficult to industrialness on RH vacuum smelting furnace furnace lining a major cause.
Summary of the invention
Purpose of the present invention is developed a kind of anti-slag infiltration erosion performance high-performance Chrome-free anti-material suitable with the high-quality magnesia chrome brick, change the existing anti-material of Chrome-free still can not substitute RH vacuum apparatus magnesia chrome brick furnace lining on the Technological Economy comprehensive significance present situation, realize that RH vacuum metling equipment liner does not have chromaking, elimination contains the environmental protection hidden danger that the chromium furnace lining of anti-the material causes, and makes the manufacturing technology of the anti-material of high-performance developed.
Technical scheme of the present invention is: a kind of RH vacuum furnace lining Chrome-free refractory materials, its starting material are formed mass percent: in magnesia or magnesium zircon sand or the magnesium zirconium silica sand one or more 88～97%, powdered zirconium oxide 1～6%, zircon fine powder 0～9%, organic bond adds 1～3%;
Its chemical ingredients mass percent is: MgO84.86～90%, SiO
21～4%, ZrO
27～13%, all the other are inevitable impurity.
Wherein, described organic bond is Sodium salts humic acids, calcium lignin sulphonate, dextrin and Sudan Gum-arabic, and this organic bond only provides refractory materials molding blank desirable strength in making processes, and decomposes volatilization in refractory materials high temperature burns till.
Magnesium oxide is the refractory oxide of high-temperature behavior excellence, basic slag is had good erosion-resisting characteristics, but it there are quite high thermal expansivity and Young's modulus, make the heat-shock resistance of this class material relatively poor, in addition, magnesian at high temperature is subject to slag penetration and causes structure spalling.Zirconium white has the fusing point height, and characteristics such as be difficult to be melted metal or glass is wetting, and thermal conductivity is low have fabulous high temperature resistance to fouling and anti-molten steel performance of flushing.Because ZrO
2Be a kind of low acidic oxides, it can resist the erosion of acidity or neutral slag, and MgO has very high resistivity to basic slag; The two combination enables to be applicable to the big smelting condition of slag basicity change.ZrO
2This effect, with Cr
2O
3Effect in magnesia chrome brick has similarity.
At MgO-ZrO
2In the two component system, do not have binary compound, the minimum eutectic temperature of the two is up to 2070 ℃.Many investigators adopt the X-diffractometer to confirm MgO-ZrO
2ZrO in the based material
2With c-ZrO
2Form exists.But under opticmicroscope, observe ZrO
2Be not mainly with c-ZrO
2Form exists.Under the more situation of impurity level, ZrO
2Exist with partially stabilized form probably.Because ZrO
2The oxide compound that belongs to the polycrystalline inversion of phases, under differing temps, it has three kinds of crystalline forms at least, and its crystalline phase has following conversion: m-ZrO
2→ t-ZrO
2Crystal transition is with 3.25% volume change, and heat shrink expands during cooling.The volume effect of zirconium white in phase transition process can be introduced tiny crack in the magnesian microstructure, a kind of actual mechanism that this is considered to improve toughness of material, improves the magnesian thermal shock resistance.Therefore, the anti-thermal shock stability of the anti-material of magnesium zirconium matter also is significantly improved than magnesium refractory, makes the magnesium zirconia refractory might become good RH Chrome-free fire proof material of furnace lining.
With magnesium oxide-zirconium white fire resistant materials and research at present more may carry out the slag resistance simultaneous test as magnesia spinel, magnesia spinel zirconium, the magnesia spinel titanium fire resistant materials of the anti-material of RH Chrome-free, and compare with the high-quality magnesia chrome brick of RH furnace lining lower channel.Static crucible method is adopted in test, places 20 gram slags in each Chrome-free crucible hole of anti-material of Φ 25 * 25, the anti-slag test of 1600 ℃ * 3h in the electric furnace.After the test residue in the crucible hole is taken out, insert 20 gram slags again and carry out anti-slag test once more.After the circulation like this 5 times, cut crucible open, measure each scouring parameter along the crucible hole center.The used slag specimen composition of anti-slag test sees Table 1.The Chrome-free crucible of anti-material sample constituents and the anti-slag test determination adopted the results are shown in Table 2, and each the Chrome-free crucible of anti-material sample all burns till preparation through high temperature.
The anti-slag of table 1 is tested the Chemical Composition of used slag specimen
| Al 2O 3 | CaO | MgO | SiO 2 | Fe 2O 3 | MnO | M.Fe | TiO 2 | P 2O 5 | FeO | S | IL. |
| 1.45 | 48.23 | 5.89 | 12.1 | 9.15 | 5.07 | 1.87 | 1.02 | 1.42 | 13.02 | 0.052 | -2.0 |
The scouring comparative determination result of the anti-slag test of table 2
Fig. 1 has represented the comparison of the anti-material of various Chrome-frees and magnesia chrome brick scouring area in the table 2 intuitively.Fig. 2 has represented the slag depth of penetration of anti-material of each Chrome-free and magnesia chrome brick.By the test-results of table 2 and Fig. 1 as can be known, the slag melting loss area of the anti-material of various Chrome-frees is roughly suitable, is on the level with magnesia chrome brick, be subjected to scouring after total metamorphic layer area less than being about 2/3rds of magnesia chrome brick; But matrix is corroded rotten area by serious, and the demagging zirconia block all is significantly higher than magnesia chrome brick outward, near the anti-material of Chrome-free by 1/2nd of the rotten total area of scouring.This matrix is by the serious part that goes bad that corrodes in material structure, the substrate material of contact granulated aggregate is substantially by scorification and there is a large amount of pits, this means and further proceed anti-slag round-robin test, these seriously erosive partly with very fast melting loss, in other words, under the actual smelting condition of RH vacuum oven, the rotten part of serious erosion in these corresponding Chrome-free furnace lining of anti-material working linings will be very fast be washed away by molten steel and slag and is deteriorated, and this will make the corresponding quick attenuate of the Chrome-free furnace lining of anti-the material and be difficult to obtain good work-ing life.And the metamorphic layer of magnesium zirconia block after being corroded by slag penetration is identical with magnesia chrome brick, still keeps fine and close material structure uniformly.The test-results of table 2 and Fig. 2 shows, the magnesium zirconia block still can be kept the fine and close advantage of uniform except having by the metamorphic layer after the slag penetration erosion, its opposing slag penetration, the ability that stops slag to enter coating material inside obviously are better than magnesia chrome brick, have showed the anti-slag ability of this material excellent comprehensive.
The further experimental study of the present invention is found, in the making of magnesium zirconium series refractory material, no matter be with zircon (ZrSiO
4) make furnish component and add ZrO
2Magnesium oxide-zircon brick, or directly with ZrO
2The magnesium zirconia block that form adds all is not that to make the magnesium zirconium be the comprehensive best composition of slag resistance of anti-material the and material cost.From MgO-ZrO
2-SiO
2The three component system phasor adds second phase as can be known in the magnesium refractory, when batching is formed some ZrSiO
4Add-on when not high, it forms point in P-MgO line scope, only has a binary phase forsterite in this system.ZrSiO when high temperature burns till
4Decompose the high reactivity SiO that produces
2Generate forsterite M with the MgO reaction
2S is filled in the infiltration that can suppress slag in the matrix gap, but forsterite also decreases than the fire performance of other high temperature phase components in the system.
If the amount of above-mentioned reaction in the material structure is controlled in the reasonable scope, is further improved the ZrO of material simultaneously again
2Content improves material property, then may receive the effect that suppresses the slag infiltration and keep the high fire performance of system simultaneously.Therefore, with respect to ZrSiO
4Zirconium silicon ratio, rich zirconic MgO-ZrO
2-SiO
2Fire resistant materials (being expressed as magnesium zirconium silica brick in the aftermentioned literal) might obtain optimum performance.
On the other hand, on the comprehensive meaning of Technological Economy, by adding the ZrSiO of reasonable amount
4, in burning till, refractory materials high temperature makes to form the structure that suppresses slag penetration, and ZrSiO
4The ZrO that decomposes gained
2Become at MgO-ZrO
2-SiO
2A kind of ZrO cheaply in the fire resistant materials
2Source, thereby the cost performance of raising material.Test-results has proved this imagination.The magnesium zirconium silica brick the 1,2,3, the 4th of table 3 is introduced SiO with zircon
2With the magnesium zirconium siliceous refractory [material of partial oxidation zirconium, example has gone out magnesium zirconia block, magnesium zirconium silica brick and magnesium oxide-zircon brick slag resistance measurement result in the table.The slag resistance condition determination is the same.
Table 3MgO-ZrO
2-SiO
2Be anti-material scouring test determination result
Test-results in the table shows, brings the magnesium zirconium silica brick of silicon oxide and partial oxidation zirconium into by zircon, and its slag penetration resistance can obviously be better than magnesium zirconia block and magnesium oxide-zircon brick, also is better than the magnesia chrome brick in the table 2.Magnesium zirconium silica brick infiltration metamorphic layer area and depth of penetration all are minimum in the table, eliminate to peel off to damage during this uses the anti-material of Chrome-free and realize that the high life is very important.In addition, owing to be rich in zirconium white in forming, the anti-slag melting loss performance of magnesium zirconium silica brick also slightly is better than magnesia chrome brick, and overall and expensive magnesium zirconia block is suitable.Although the zirconium content of magnesium zirconium silica brick 1 is on the low side in the table, anti-melting loss performance occurs and descend to some extent than the magnesium zirconia block, but still be in table 2 in RH with the suitable level of high-quality magnesia chrome brick.Although magnesium oxide in the table-zircon brick zirconia content height, the too high fire performance that reduces system of silica content, its anti-slag melting loss and slag penetration resistance can be all obviously not as magnesium zirconium silica bricks.
In sum, in the RH vacuum furnace lining Chrome-free refractory materials of the present invention, zirconia content is starkly lower than 7%, and is unfavorable to the anti-slag melting loss performance of material, if be higher than 13%, material property improves not obvious and cost will obviously rise; Silica content should be controlled at 1～4%, is lower than 1%, and it is not obvious to improve the anti-slag osmotic effect of material, and the material cost of manufacture is higher; Be higher than 4%, the anti-slag melting loss and the slag penetration resistance of material can all have remarkable decline; Silica content 2～3%, zirconia content 9～11%, more excellent.The mode that zircon adds in the magnesium zirconium silica brick of the present invention both can directly add, and also can cooperate with magnesia raw material to be processed as the synthetic siliceous synthesis material of magnesium zirconium (magnesium zirconium silica sand) adding.The mode that zirconium white adds both can directly add with stable, semi-stability zirconium white and monoclinic zirconia form, also can cooperate with magnesia raw material to be processed as synthetic magnesium zirconium matter synthesis material (magnesium zircon sand) adding.Two kinds of compositions that the adding mode is introduced are identical in refractory materials rule of its role and reflection after high temperature burns till.
Based on above consideration, starting material of the present invention are magnesia or magnesium zircon sand or magnesium zirconium silica sand particle and fine powder and micro mist, zircon fine powder, powdered zirconium oxide, change the composition of material by the adjusting raw material ratio, thereby material property and work-ing life are controlled.This refractory materials adopts above-mentioned starting material to form, with the refractory materials manufacturing process of routine, through prepare burden, mix, moulding and high temperature burns till and makes.
Beneficial effect of the present invention
The MgO-ZrO of the present invention's exploitation
2-SiO
2Matter Chrome-free refractory materials has with respect to RH lower channel high-quality MgO-Cr
2O
3Brick and the more excellent slag resistance of existing other RH chromium-free bricks, particularly its slag penetration resistance energy, even obviously be better than expensive MgO-ZrO
2Fire resistant materials, this damage of peeling off that RH vacuum metling furnace lining is eliminated in using realizes that the high life is significant.The present invention is that raw material is introduced silicon oxide and partial oxidation zirconium with the zircon in material, can obviously reduce material cost, simultaneously the silicon oxide that decomposes down of zircon high temperature the intergranular of material structure and intergranular form forsterite mutually with high performance zirconium white, material is formed with is beneficial to the favorable tissue structure that anti-slag permeates, improved the slag resistance of material, thereby made the anti-material of this Chrome-free can obtain to be better than the work-ing life of the anti-material of other Chrome-frees.This all will advance the anti-material of RH vacuum metling equipment furnace lining not have the development of chromaking technology from technology and economic angle, make the anti-material of Chrome-free can realize substituting the classical anti-material of magnesium chromium matter RH vacuum apparatus furnace lining on industrial significance.
Description of drawings
Fig. 1 is anti-material of each Chrome-free and magnesia chrome brick scouring area.
Fig. 2 is the slag depth of penetration of anti-material of each Chrome-free and magnesia chrome brick.
Fig. 3 is MgO-ZrO
2-SiO
2Ternary phase diagrams.
Embodiment
Embodiment sees Table 4.
Table 4
| Embodiment | Comparative example | |||||||
| 1 | 2 | 3 | 4 | 5 | 6 | 1 | 2 | |
| Granularity :≤10mm | Electrosmelted magnesite clinker 91% | Electrosmelted magnesite clinker 88% | Magnesium zirconium silicon synthetic sand 96% | Magnesium zirconium silicon synthetic sand 92.5% | Electrosmelted magnesite clinker 91% | Magnesium zirconium synthetic sand 94% | Magnesium zirconium synthetic sand 96% | Electrosmelted magnesite clinker 84.5% |
| Zircon≤0.088mm | 5％ | 8％ | 3％ | 4％ | 5％ | 15.5％ | ||
| Zirconium white≤0.088mm | 4％ | 4％ | 4％ | 4.5％ | 5％ | 1％ | 4％ | |
| Sodium salts humic acids (adding) | 2％ | 2％ | 3％ | 2％ | 2％ | 2％ | 2％ | 2％ |
| The close g/cm of body 3 | 3.14 | 3.13 | 3.14 | 3.18 | 3.14 | 3.15 | 3.17 | 3.11 |
| Apparent porosity % | 11 | 13 | 14 | 14 | 12 | 14 | 14 | 12 |
| Withstand voltage, Mpa | 70.7 | 59.1 | 72.5 | 87.2 | 65.2 | 77.6 | 84.4 | 57.8 |
| 1450 ℃ * 1h of high temperature anti-folding Mpa | 6.8 | 4.1 | 6.2 | 6.5 | 6.5 | 6.9 | 7.1 | 2.4 | |
| Chemical ingredients wt% | MgO | 87.67 | 85.47 | 84.86 | 81.85 | 88.18 | 85.38 | 87.25 | 81.96 |
| ZrO 2 | 7.10 | 9.07 | 10.36 | 12.62 | 7.39 | 10.72 | 10.24 | 10.23 | |
| SiO 2 | 1.65 | 2.48 | 2.82 | 3.76 | 1.28 | 1.60 | 0.29 | 4.95 | |
| Slag melting loss index ※ | 1.2 | 1.05 | 0.96 | 1.02 | 1.15 | 0.95 | 1.0 | 1.27 | |
| The slag penetration index ※ | 0.87 | 0.74 | 0.70 | 0.88 | 0.89 | 0.80 | 1.0 | 1.41 | |
※ serves as to measure basis relatively with the slag melting loss and the slag penetration test value of the anti-material of comparative example 1 magnesium zirconium matter, counts 1.All the other are the slag melting loss of relatively example 1 and the relative value of slag penetration test value, and numerical value is more little, and the slag resistance of material is good more.
The performance of embodiment shows in the table, and the anti-slag melting loss of the anti-material of Chrome-free of the present invention and slag penetration resistance can obviously be better than the magnesium oxide-stone zircon refractory of comparative example 2, also is better than the RH vacuum metling furnace lining high-quality magnesia chrome brick of table 2.Its slag penetration resistance can be able to be better than the magnesium zirconia block of expensive comparative example 1, and performances such as the body of material is close, hot strength and apparent porosity are also all good, can satisfy the requirement of RH vacuum apparatus to the anti-material of furnace lining.
In a word, the present invention is the RH vacuum apparatus furnace lining magnesium zirconium siliceous refractory [material of feature to add zircon introducing silicon oxide and low cost zirconium oxide, anti-slag infiltration and melting loss excellent property, and other physicalies are good.Its cost of manufacture fully obviously reduces with the anti-material of magnesium zirconium matter that the zirconium white mode is introduced zirconium, the cost performance of material is obviously improved, thereby can substitute magnesia chrome brick at the very harsh position of smelting conditions such as RH vacuum apparatus furnace lining.Refractory materials as a kind of high-temperature behavior excellence, being applied on High-temp. kiln and the smelting equipment container furnace lining of magnesium zirconium siliceous refractory [material of the present invention has general adaptability, and the smelting equipment that requires in the similar performance of all kinds of steel mills is built in the lining and all can be promoted the use of.Refractory materials of the present invention also can be used as the anti-material of carbon-free slag line that substitutes magnesia carbon brick at the ladle slag line of smelting suprelow carbon steel.
Claims (2)
1. vacuum oven furnace lining Chrome-free refractory materials, its starting material are formed mass percent and are:
In magnesia, magnesium zircon sand or the magnesium zirconium silica sand one or more 88～97%,
Powdered zirconium oxide 1～6%,
Zircon fine powder 0～9%,
Organic bond adds 1～3%;
Its chemical ingredients mass percent is:
MgO 84.86～90％，
SiO
2 1～4％，
ZrO
2 7～13％，
All the other are inevitable impurity.
2. vacuum oven furnace lining Chrome-free refractory materials as claimed in claim 1 is characterized in that: described organic bond be in Sodium salts humic acids, calcium lignin sulphonate, dextrin or the Sudan Gum-arabic any one.
Priority Applications (1)
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| CNB2004100256372A CN1325435C (en) | 2004-06-30 | 2004-06-30 | Chromium free refractory material for RH vacuum furnace lining |
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| CNB2004100256372A CN1325435C (en) | 2004-06-30 | 2004-06-30 | Chromium free refractory material for RH vacuum furnace lining |
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| CN1325435C true CN1325435C (en) | 2007-07-11 |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100372808C (en) * | 2006-04-18 | 2008-03-05 | 中国建筑材料科学研究院大石桥镁砖厂 | Making process of zirconium-containing magnesia brick |
| CN101475383B (en) * | 2009-01-21 | 2012-03-07 | 张培庆 | Kiln alkaline brick for producing vanadium nitrogen alloy and method for producing the same |
| CN102145995A (en) * | 2011-04-06 | 2011-08-10 | 瑞泰科技股份有限公司 | Magnesium-zirconium brick with high erosion resistance and thermal shock resistance for RH furnace and production technology thereof |
| CN104058762B (en) * | 2014-07-08 | 2015-11-18 | 攀钢集团攀枝花钢铁研究院有限公司 | RH Chrome-free Gunning refractory and preparation method thereof |
| CN108383506A (en) * | 2018-03-12 | 2018-08-10 | 海城利尔麦格西塔材料有限公司 | A kind of preparation method of magnesium Cr-Zr brick |
| CN112094125B (en) * | 2020-09-22 | 2023-02-28 | 武汉科技大学 | Low-thermal-conductivity low-thermal-expansion magnesium-based raw material and preparation method thereof |
| CN112142447B (en) * | 2020-09-22 | 2022-02-25 | 武汉科技大学 | High-performance energy-saving magnesium-based raw material and preparation method thereof |
| CN114292094A (en) * | 2021-12-28 | 2022-04-08 | 郑州荣盛窑炉耐火材料有限公司 | Acid-corrosion-resistant long-life refractory brick for Osmant furnace and preparation method thereof |
| CN114409417A (en) * | 2022-01-17 | 2022-04-29 | 瑞泰马钢新材料科技有限公司 | Gate valve sliding plate brick for converter slag stopping and preparation method thereof |
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