CN102557679A - Super-micro powder composite impervious ceramic precast block for refining furnace and preparation method - Google Patents
Super-micro powder composite impervious ceramic precast block for refining furnace and preparation method Download PDFInfo
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- CN102557679A CN102557679A CN2011103925655A CN201110392565A CN102557679A CN 102557679 A CN102557679 A CN 102557679A CN 2011103925655 A CN2011103925655 A CN 2011103925655A CN 201110392565 A CN201110392565 A CN 201110392565A CN 102557679 A CN102557679 A CN 102557679A
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Abstract
The invention discloses a super-micro powder composite impervious ceramic precast block for a refining furnace and a preparation method. The precast block does not require high-temperature sintering and is chromium-free, strong in corrosion resistance, good in thermal shock stability and abrasion resistance, excellent in slag penetration dissolution resistance and long in service life. Electrically melted pre-synthesized aluminum rich spinel and aluminum oxide micro powder are used as main materials; and the precast block is formed by adding the pre-synthesized spinel micro powder, combining the spinel micro powder and the aluminum oxide micro powder, adding high-performance aluminum oxide water reducing agent, trace pure calcium aluminate cement coagulant and organic explosion-proof fibers, moulding by casting and baking at a low temperature.
Description
Technical field
The present invention relates to a kind of prefabricated refractory materials that refining furnace is used.Composite impervious ceramics preparative piece of specifically a kind of super-fine powder and preparation method.
Background technology
Improve the over-all properties of ferrous materials, prolonging its work-ing life is one of main direction of ferrous materials development from now on, is the important channel that reaches this target and adopt advanced Clean Steel smelting technology and improve constantly its state of the art; Choose reasonable is to realize smelting the important assurance that Clean Steel is smelted with the correct fine refractory materials that uses.
The industrial and mineral condition is constantly harsh in the RH refining function development history stove, and the progress of material technology still makes lining life be significantly improved, but under high temperature and alkaline environment for use, contains Cr
2O
3Refractory materials is at oxidizing atmosphere and strong basicity oxide compound Na
2O, K
2O or CaO exist down, trivalent chromium Cr
3+Can change sexavalent chrome Cr into
6+And a kind of carcinogens during sexavalent chrome is harmful and soluble in water, Cr
2O
3Can exist with gas phase, in producing use, can enter polluted air in the air, contaminate environment with flue gas.At present used refractory materials majority contains chromium, and environment is existed great pollution, generally can't satisfy existing environmental requirement, and exist the life-span low, pollute problem in the eye such as molten steel.Therefore solve the pollution problem that contains the chromium material, adopting with eco-friendly high-performance refractory material-promptly do not have the chromaking refractory materials is development trend from now on.
In addition, used refining furnace all needs high temperature sintering with refractory materials at present now, has not only increased enterprise cost and energy consumption, and has caused environmental pollution.
Summary of the invention
Because material adopts the super-fine powder micro mist compound, the activated sintering under the low-temperature condition in having realized using has also realized the high-strength ceramic combination, need not high temperature sintering in the making processes, greatly reduces low enterprise energy consumption, has practiced thrift cost.In the high temperature field, has far reaching significance to falling alleviating energy crisis.Technical progress to China's refractory materials manufacturing and refractory materials has been played positive promoter action, obvious social benefit with development.
Refining furnace uses the composite impervious ceramics preparative piece of super-fine powder to the objective of the invention is for solving the deficiency that refining furnace refractory material furnace lining technical problems such as Clean Steel smelting and RH, LF, VD, SKF exist; Provide that a kind of energy-conservation (need not high temperature sintering) environmental protection (Chrome-free), high-temperature behavior are excellent, void content is low, resistance to fouling is strong, thermal shock resistance and wear resistance be good; Anti-slag penetration corrosion excellent performance, carbon-free, no silicon, not without dye and be mingled with molten steel (not phosphorization, sulphur, oxygen, nitrogen, hydrogen), high-strengthly, anti-peel off, refining furnaces such as globality is good, the Clean Steel smelting of long service life and RH, LF, VD, SKF are with composite impervious ceramics preparative piece of super-fine powder and preparation method.
The present invention is the deficiency that solves the problems of the technologies described above, and the technical scheme that is adopted is: refining furnaces such as Clean Steel smelting and RH, LF, VD, SKF are with the composite impervious ceramics preparative piece of super-fine powder, and used main material is by the preparatory synthesizing aluminum-enriched spinel (Al of electric smelting
2O
3% content>=90%) and the compound employing of alumina powder, add preparatory synthetic spinel micro mist, spinel micro mist and alumina powder combine, and add high-performance aluminum oxide water reducer (Al
2O
3% content>=90%) and the trace pure calcium aluminate cement setting accelerator (Al
2O
3% content>=70%), add organic explosion-proof fiber, casting, low-temperature bake forms.
The parts by weight and the additional proportion of preparatory synthesizing aluminum-enriched spinel of electric smelting and alumina powder and preparatory synthetic spinel micro mist, high-performance aluminum oxide water reducer and setting accelerator are: electric smelting aluminium riched spinel (Al
2O
3% content>=90%) 70-75 part, preparatory synthetic spinel (the single or compound employing of electric smelting and sintering spinel) 15-19 part, alumina powder 5-8 part; Pure calcium aluminate cement 0.5-4 part of high-performance aluminum oxide water reducer 0.5-2 part, trace, the organic explosion-proof fiber that adds 0.01-0.03 part of the preparatory synthesizing aluminum-enriched spinel of electric smelting, alumina powder, preparatory synthetic spinel micro mist, high-performance aluminum oxide water reducer, pure calcium aluminate cement setting accelerator total weight.Described electric smelting aluminium riched spinel, in advance synthetic spinel, alumina powder be according to processing that the material Clean Steel is smelted and refining furnaces such as RH use the position differences to have different grain size categories, its size-grade distribution 25-15mm, 15-8mm, 8-5mm, 5-3mm, 3-1mm, 1-0mm ,≤grain size intervals of 1um.
Described high-performance aluminum oxide water reducer Al
2O
3% content is between 90-99%.
Described alumina powder Al
2O
3% content is between 95-99.7%.
The Al of said preparatory synthetic spinel micro mist
2O
3Content is between 60-90%.
Said electric smelting aluminium riched spinel Al
2O
3% content>=90%.
Described pure calcium aluminate cement setting accelerator Al
2O
3% content is between 70-80%.
The present invention, refining furnace uses the preparation method of the in advance synthetic composite impervious ceramics preparative piece of super-fine powder to be:
Step 1, electric smelting aluminium riched spinel (Al
2O
3% content>=90%) 70-75 part, preparatory synthetic spinel micro mist (the single or compound employing of electric smelting and sintering spinel) 15-19 part, alumina powder 5-8 part; Pure calcium aluminate cement 0.5-4 part of high-performance aluminum oxide water reducer 0.5-2 part, trace; Add the organic explosion-proof fiber of 0.01-0.03 part of the preparatory synthesizing aluminum-enriched spinel of electric smelting, alumina powder, preparatory synthetic spinel, high-performance aluminum oxide water reducer, pure calcium aluminate cement setting accelerator total weight; Put into powerful sand mill premix 10-15min, the material that mixes is subsequent use;
Step 2, the material that will mix add entry 5-10%, continue to stir 5-10min, and raw material is processed concrete mortar; Adopt the moulding moulded mode of vibration decompression promptly-concrete mortar of processing is injected in the mould that assembles in advance, carry out high-frequency vibration and vacuum-treat, remove bubble;
Step 3, wet method insulated curing, temperature is not less than 5 ℃, treats the demoulding behind the coagulation forming;
Step 4, the biscuit that will deviate from are placed in the environment that temperature is not less than 5 ℃ and continue water-filled boiler protection.
After step 5, the maintenance, put into moisture eliminator oven dry, bake out temperature normal temperature-500 ℃, the time was greater than 60 hours;
After step 6, oven dry finish, cooling gradually, the time is 18-25 hour, temperature is come out of the stove after reducing to below 50 ℃, according to processing refining furnace with composite impervious ceramics preparative piece of super-fine powder and preparation method after the dimensional requirement selection.
The invention has the beneficial effects as follows: this product is novel high-performance refractory material-promptly do not have a chromaking refractory materials.Raw material that this product adopts is that the preparatory synthetic aluminium riched spinel of high pure oxide-electric smelting method is as main raw material; Utilize activate mechanism; Through selecting suitable compound super-fine powder additive and combined binder and control add-on, select suitable operational path and parameter, and produce composition through optimizing materials; Reduce coefficient of thermal expansion, improved thermal shock resistance and erosion-resisting characteristics.The material of developing has that high-temperature behavior is good, intensity is high, resistance to fouling good, wear resistance is strong, the hot line rate of expansion is low, thermal shock resistance and impermeabilisation corrode excellent material.Have Chrome-free (environmental nonpollution), carbon-free, no silicon, not without dying molten steel (not phosphorization, sulphur, oxygen, nitrogen, hydrogen), high-strength, anti-excellent specific property of peeling off, significantly reduce refractory materials to the pollution of molten steel be mingled with.Introduce the super-fine powder additive, in casting and constructing, fully the slit between the filler particles reaches the pore miniaturization.Make refractory materials pore reduced radius, slag infiltrates and becomes shallow more, and the harm of structure spalling reduces greatly.The pore miniaturization of material is than the simple infiltration that pore quantity more can stop melt, the raising resistance to fouling of reducing.The air vent aperture of material is more little, and the penetrating power of its anti-slag is strong more.And pore miniaturization and the weave construction that is evenly distributed can not only reduce Gas permeability in the brick, and can improve heat-shock resistance.Introduce the super-fine powder additive, reach the part pottery and combine,, change the addition manner of magnesium in the matrix, improve the matrix and the particle combining form of material, the anti-reactive infiltration property of material is greatly enhanced through adding rational micro mist and improving grating.And, owing to adopt super-fine powder composite additive and wedding agent, realize high fine and close, low pore, and realize activated sintering under the low temperature.(interpolation of super-fine powder has realized the activated sintering of sharp high temperature kiln work calories in the material use).Adopt preparatory synthetic aluminium riched spinel of electric smelting method and rational compound super-fine powder to combine; The pure calcium aluminate cement setting accelerator of high-performance aluminum oxide water reducer and trace; Not only guarantee high-purity property of material, also improved the hot strength and the high temperature wear resistance of material greatly.Because the matrix and the equal voltinism of particle of material have reduced material coefficient of thermal expansion rate (the hot line rate of expansion is low), have improved the thermal shock resistance of material.Confirming of introducing mode through spinel amount (composition, proportional quantity) and micro powder granule form; To burn back line velocity of variation to be controlled at+the 0.5-0.7% scope in; Not only under the high temperature environment for use; The globality of masonry very good (defective of brickwork joint has been offset in the expansion of trace), and the minimized high temperature service stress of having eliminated material, high-temperature elastic modulus and anti-fracture toughness property are better.The application of high pure oxide, production technique adopts casting, low porosity, HS behind the high temperature sintering, has good high-temperature intensity in the use, and wear resisting property improves greatly.Thermal shock performance, the high temperature break resistant intensity of the in advance synthetic composite impervious ceramics preparative piece of super-fine powder refractory materials, wear resisting property and anti-slag penetration performance are much better than magnesia chrome brick.Energy-saving and emission-reduction-material adopts super-fine powder compound, and the activated sintering under the low-temperature condition in having realized using has also realized the high-strength ceramic combination, need not high temperature sintering in the making processes, greatly reduces low enterprise energy consumption, has practiced thrift cost.In the high temperature field, has far reaching significance to falling alleviating energy crisis.Technical progress to China's refractory materials manufacturing and refractory materials has been played positive promoter action, obvious social benefit with development.The raw material of choosing is formed rationally, and product is synthetic materials, is convenient to buying.Product cost is low, is easy to promote the use of; Raw materials used to have a multiple different grain size interval, and tap density is big, and product strength is high, wear resisting property is good, and acid-resistance and slag basic ooze that effect is strong, and thermal shock resistance is strong, high-temperature behavior excellence, long service life; Product is guiding with the domestic and international market; Aiming refractory industry forefront, world science and technology; Material has more long-lived, more energy-conservation, pollution-free (green), functionalization characteristic; Satisfy the hot industry development need, this not still China's refractory industry meet the world industry development trend in the target of Tenth Five-Year Plan Period breed structure adjustment.
Index is following: physical and chemical index
Embodiment
Embodiment 1
Refining furnace is with the preparation method of the composite impervious ceramics preparative piece of super-fine powder, electric smelting aluminium riched spinel (Al
2O
3% content>=90%) 70 parts, in advance 16 parts of synthetic spinel micro mists (electric smelting and sintering spinel list-or compound employing), 8 parts of alumina powders; 2 parts of high-performance aluminum oxide water reducers, 4 parts of pure calcium aluminate cements; Add 0.015 part organic explosion-proof fiber of the preparatory synthesizing aluminum-enriched spinel of electric smelting, alumina powder, preparatory synthetic spinel, high-performance aluminum oxide water reducer, pure calcium aluminate cement setting accelerator total weight; Put into powerful sand mill premix 13min, the material that mixes is subsequent use; The material that mixes is added entry 5%, continue to stir 6min, raw material is processed concrete mortar; Adopt the moulding moulded mode of vibration decompression promptly-concrete mortar of processing is injected in the mould that assembles in advance, carry out high-frequency vibration and vacuum-treat, remove bubble; The wet method insulated curing, is treated the demoulding behind the coagulation forming by temperature 7-25 ℃; The biscuit that to deviate from is placed in the environment that temperature is not less than 7-25 ℃ and continues water-filled boiler protection.After the maintenance, put into moisture eliminator oven dry, bake out temperature normal temperature-500 ℃, 70 hours time; After oven dry finishes, cooling gradually, the time is 19 hours, temperature is come out of the stove after reducing to 50 ℃, according to processing refining furnace with the composite impervious ceramics preparative piece of super-fine powder after the dimensional requirement selection.
Embodiment 2
Electric smelting aluminium riched spinel (Al
2O
3% content>=90%) 72 parts, in advance 15 parts of synthetic spinel micro mists (the single or compound employing of electric smelting and sintering spinel), 8 parts of alumina powders; 2 parts of high-performance aluminum oxide water reducers, 3 parts of pure calcium aluminate cements; Add 0.013 part organic explosion-proof fiber of the preparatory synthesizing aluminum-enriched spinel of electric smelting, alumina powder, preparatory synthetic spinel, high-performance aluminum oxide water reducer, pure calcium aluminate cement setting accelerator total weight; Put into powerful sand mill premix 14min, the material that mixes is subsequent use; The material that mixes is added entry 5.5%, continue to stir 5min, raw material is processed concrete mortar; Adopt the moulding moulded mode of vibration decompression promptly-concrete mortar of processing is injected in the mould that assembles in advance, carry out high-frequency vibration and vacuum-treat, remove bubble; The wet method insulated curing, is treated the demoulding behind the coagulation forming by temperature 10-25 ℃; The biscuit that to deviate from is placed in the environment that temperature is not less than 10-25 ℃ and continues water-filled boiler protection.After the maintenance, put into moisture eliminator oven dry, bake out temperature normal temperature-500 ℃, 75 hours time; After oven dry finishes, cooling gradually, the time is 20 hours, temperature is come out of the stove after reducing to 50 ℃, according to processing refining furnace with the composite impervious ceramics preparative piece of super-fine powder after the dimensional requirement selection.
Embodiment 3
Electric smelting aluminium riched spinel (Al
2O
3% content>=90%) 73 parts, in advance 17 parts of synthetic spinel micro mists (the single or compound employing of electric smelting and sintering spinel), 7 parts of alumina powders; 1 part of high-performance aluminum oxide water reducer, 2 parts of pure calcium aluminate cements; Add the O.014 organic explosion-proof fiber of part of the preparatory synthesizing aluminum-enriched spinel of electric smelting, alumina powder, preparatory synthetic spinel, high-performance aluminum oxide water reducer, pure calcium aluminate cement setting accelerator total weight; Put into powerful sand mill premix 13min, the material that mixes is subsequent use; The material that mixes is added entry 6%, continue to stir 6min, raw material is processed concrete mortar; Adopt the moulding moulded mode of vibration decompression promptly-concrete mortar of processing is injected in the mould that assembles in advance, carry out high-frequency vibration and vacuum-treat, remove bubble; The wet method insulated curing, is treated the demoulding behind the coagulation forming by temperature 15-25 ℃; The biscuit that to deviate from is placed in the environment that temperature is not less than 15-25 ℃ and continues water-filled boiler protection.After the maintenance, put into moisture eliminator oven dry, bake out temperature normal temperature-500 ℃, 80 hours time; After oven dry finishes, cooling gradually, the time is 20 hours, temperature is come out of the stove after reducing to 50 ℃, according to processing refining furnace with the composite impervious ceramics preparative piece of super-fine powder after the dimensional requirement selection.
Embodiment 4
Electric smelting aluminium riched spinel (Al
2O
3% content>=90%) 71 parts, in advance 15 parts of synthetic spinel micro mists (the single or compound employing of electric smelting and sintering spinel), 8 parts of alumina powders; 2 parts of high-performance aluminum oxide water reducers, 4 parts of pure calcium aluminate cements; Add 0.01 part organic explosion-proof fiber of the preparatory synthesizing aluminum-enriched spinel of electric smelting, alumina powder, preparatory synthetic spinel, high-performance aluminum oxide water reducer, pure calcium aluminate cement setting accelerator total weight; Put into powerful sand mill premix 11min, the material that mixes is subsequent use; The material that mixes is added entry 6%, continue to stir 7min, raw material is processed concrete mortar; Adopt the moulding moulded mode of vibration decompression promptly-concrete mortar of processing is injected in the mould that assembles in advance, carry out high-frequency vibration and vacuum-treat, remove bubble; The wet method insulated curing, is treated the demoulding behind the coagulation forming by temperature 10-25 ℃; The biscuit that to deviate from is placed in the environment that temperature is not less than 10-25 ℃ and continues water-filled boiler protection.After the maintenance, put into moisture eliminator oven dry, bake out temperature normal temperature-500 ℃, 80 hours time; After oven dry finishes, cooling gradually, the time is 20 hours, temperature is come out of the stove after reducing to 50 ℃, according to processing refining furnace with the composite impervious ceramics preparative piece of super-fine powder after the dimensional requirement selection.
Claims (6)
1. a refining furnace is with the composite impervious ceramics preparative piece of super-fine powder; It is characterized in that: used main material is by preparatory synthesizing aluminum-enriched spinel of electric smelting and the compound employing of alumina powder; Add preparatory synthetic spinel micro mist; Spinel micro mist and alumina powder combine, and add the pure calcium aluminate cement setting accelerator of high-performance aluminum oxide water reducer and trace, add organic explosion-proof fiber.
2. refining furnace according to claim 1 is characterized in that with the composite impervious ceramics preparative piece of super-fine powder: electric smelting aluminium riched spinel 70-75 part, preparatory synthetic spinel 15-19 part, alumina powder 5-8 part; High-performance aluminum oxide water reducer 0.5-2 part, pure calcium aluminate cement 0.5-4 part, the organic explosion-proof fiber that adds 0.01-0.03 part of the preparatory synthesizing aluminum-enriched spinel of electric smelting, alumina powder, preparatory synthetic spinel micro mist, high-performance aluminum oxide water reducer, pure calcium aluminate cement setting accelerator total weight.
3. refining furnace according to claim 1 is characterized in that with the composite impervious ceramics preparative piece of super-fine powder: the Al of preparatory synthetic spinel micro mist
2O
3Content is between 60-90%.
4. refining furnace according to claim 1 is characterized in that with the composite impervious ceramics preparative piece of super-fine powder: pure calcium aluminate cement setting accelerator Al
2O
3% content is between 70-80%.
5. refining furnace according to claim 1 is characterized in that with the composite impervious ceramics preparative piece of super-fine powder: high-performance aluminum oxide water reducer Al
2O
3% content is between 90-99%.
6. according to the preparation method of the said refining furnace of claim 1, it is characterized in that with the composite impervious ceramics preparative piece of super-fine powder:
Step 1, electric smelting aluminium riched spinel 70-75 part, preparatory synthetic spinel micro mist 15-19 part, alumina powder 5-8 part; Pure calcium aluminate cement 0.5-4 part of high-performance aluminum oxide water reducer 0.5-2 part, trace; Add the organic explosion-proof fiber of 0.01-0.03 part of the preparatory synthesizing aluminum-enriched spinel of electric smelting, alumina powder, preparatory synthetic spinel, high-performance aluminum oxide water reducer, pure calcium aluminate cement setting accelerator total weight; Put into powerful sand mill premix 10-15min, the material that mixes is subsequent use;
Step 2, the material that will mix add entry 5-10%, continue to stir 5-10min, and raw material is processed concrete mortar; Adopt the moulding moulded mode of vibration decompression promptly-concrete mortar of processing is injected in the mould that assembles in advance, carry out high-frequency vibration and vacuum-treat, remove bubble;
Step 3, wet method insulated curing, temperature is not less than 5 ℃, treats the demoulding behind the coagulation forming;
Step 4, the biscuit that will deviate from are placed in the environment that temperature is not less than 5 ℃ and continue water-filled boiler protection;
After step 5, the maintenance, put into moisture eliminator oven dry, bake out temperature normal temperature-500 ℃, the time was greater than 60 hours;
After step 6, oven dry finish, cooling gradually, the time is 18-25 hour, temperature is come out of the stove after reducing to below 50 ℃, according to processing refining furnace with composite impervious ceramics preparative piece of super-fine powder and preparation method after the dimensional requirement selection.
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|---|---|---|---|
| CN201110392565.5A CN102557679B (en) | 2011-11-24 | 2011-11-24 | Super-micro powder composite impervious ceramic precast block for refining furnace and preparation method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104193370A (en) * | 2014-08-27 | 2014-12-10 | 北京利尔高温材料股份有限公司 | Preparation method of steel ladle carbon-free precast block |
| CN105272314A (en) * | 2015-11-12 | 2016-01-27 | 长兴科特碳化硅有限公司 | Environment-friendly chromium-free air brick |
| CN116396101A (en) * | 2023-04-24 | 2023-07-07 | 大冶有色金属有限责任公司 | Method for maintaining reduction tube of regenerated copper refining reverberatory furnace |
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| CN1485297A (en) * | 2002-09-29 | 2004-03-31 | 宝山钢铁股份有限公司 | Pouring materialfor steel ladle with low density and low heat conduction |
| CN101367662A (en) * | 2008-09-19 | 2009-02-18 | 攀钢集团研究院有限公司 | Flame-proof pouring material formulated with ferrovanadium slag |
-
2011
- 2011-11-24 CN CN201110392565.5A patent/CN102557679B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1485297A (en) * | 2002-09-29 | 2004-03-31 | 宝山钢铁股份有限公司 | Pouring materialfor steel ladle with low density and low heat conduction |
| CN101367662A (en) * | 2008-09-19 | 2009-02-18 | 攀钢集团研究院有限公司 | Flame-proof pouring material formulated with ferrovanadium slag |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104193370A (en) * | 2014-08-27 | 2014-12-10 | 北京利尔高温材料股份有限公司 | Preparation method of steel ladle carbon-free precast block |
| CN104193370B (en) * | 2014-08-27 | 2016-03-02 | 北京利尔高温材料股份有限公司 | A kind of preparation method of ladle carbon free precast block |
| CN105272314A (en) * | 2015-11-12 | 2016-01-27 | 长兴科特碳化硅有限公司 | Environment-friendly chromium-free air brick |
| CN105272314B (en) * | 2015-11-12 | 2017-12-08 | 浙江科特高温新材料有限公司 | A kind of environmentally friendly Chrome-free air brick |
| CN116396101A (en) * | 2023-04-24 | 2023-07-07 | 大冶有色金属有限责任公司 | Method for maintaining reduction tube of regenerated copper refining reverberatory furnace |
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|---|---|
| CN102557679B (en) | 2014-09-03 |
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Address after: 471039, Xiyuan Road, Jianxi District, Henan, Luoyang Patentee after: Sinosteel luonai New Material Technology Co., Ltd Address before: 471039, Xiyuan Road, Jianxi District, Henan, Luoyang Patentee before: SiNOSTEEL Refractory Co., Ltd. |
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| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 471039, Xiyuan Road, Jianxi District, Henan, Luoyang Patentee after: Sinosteel luonai Technology Co., Ltd Address before: 471039, Xiyuan Road, Jianxi District, Henan, Luoyang Patentee before: Sinosteel luonai New Material Technology Co.,Ltd. |