CN101928837B - Method for producing silicon-aluminum-barium alloy - Google Patents
Method for producing silicon-aluminum-barium alloy Download PDFInfo
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- CN101928837B CN101928837B CN2010102933895A CN201010293389A CN101928837B CN 101928837 B CN101928837 B CN 101928837B CN 2010102933895 A CN2010102933895 A CN 2010102933895A CN 201010293389 A CN201010293389 A CN 201010293389A CN 101928837 B CN101928837 B CN 101928837B
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Abstract
The invention relates to a method for producing a silicon-aluminum-barium alloy, and belongs to the field of alloys. The technical problem to be solved is to provide a method for producing the silicon-aluminum-barium alloy with lower cost. The method for producing the silicon-aluminum-barium alloy comprises the following steps of: uniformly mixing 60 to 80 weight percent of fly ash and 20 to 40 weight percent of barite fine powder and pressing into blanks or pelletizing, and drying; adding 5 to 20 percent of iron scrap or iron powder, 20 to 35 percent of carbon reducing agent and 2 to 5 percent of fluorite based on the total weight of the fly ash and the barite fine powder, smelting for 1 to 4 hours at the temperature of between 1,800 and 2,200 DEG C to obtain alloy solution, and refining to obtain the silicon-aluminum-barium alloy.
Description
Technical field
The present invention relates to produce the method for silicon-aluminium-barium alloy, belong to the alloy field.
Background technology
Flyash is the dust that deposits in the smog of the lime-ash of discharging in process of coal combustion and burning, is one of larger industrial residue of present China discharge capacity.Related data shows, calculates with the thermoelectricity generated energy of 2006, and power plants approximately produces 2.4～2.9 hundred million tons of flyash and 0.2～0.3 hundred million ton slags then, occupies first of the world.At present, China is only 30～40% left and right to the utilization ratio of flyash.Take fire coal as main industrial expansion, the quantity discharged of flyash can increase gradually along with power industry etc., and a large amount of flyash does not add processing, causes dust from flying, severe contamination atmosphere, land occupation resource.
The Technology of Comprehensive Utilization of Coal Ash of China has been obtained very large achievement through the development of decades, but still there are a lot of problems, it mainly utilizes approach to be mainly and builds the road, material of construction, concrete and cement etc., and comprehensive utilization ratio is on the low side and have significant areal variation.Owing to containing abundant silicon, bauxite resource in flyash, iff used as material of construction etc., not only reduced its utility value, be also the serious waste to silicon, bauxite resource, be unfavorable for socioeconomic development.
Silicon-aluminium-barium alloy is a kind of high efficiency deoxidiser for steel-making final deoxygenation process, is inner quality, the mechanical property that improves steel of improving steel, effective new technology of saving the production cost of high energy consumption aluminium amount and reduction steel.The common smelting technology of silicon-aluminium-barium alloy is called Technology For Remelting, is about to electrolytic aluminum, silicon and barium ore deposit, is added to refusion and smelting in middle frequency furnace, and because operation is more difficult, production difficulty is large, cost higher (per ton cost is up to more than ten thousand yuan).
Application number is 200510011394.1, denomination of invention prepares the method for Alsimin for the Chinese patent application of " a kind of is the method for raw material production AL-Si-Fe alloy with flyash " discloses a kind of flyash that utilizes for main raw material, but in its alloy, without metal Ba, and its smelting technology can not be smelted the alloy that contains Ba.Its smelting temperature is lower, easily is mingled with Al in alloy
4C
3In carbide, cause alloy to have efflorescence trend, the alloy less stable.
Publication number is CN1676630A, denomination of invention for the Patent Application Publication of " utilizing the method for flyash smelting ferro-silicon-aluminium alloy " a kind of flyash that utilizes be the method for one of raw material smelting ferro-silicon-aluminium alloy, but the consumption of its flyash is lower, is only 28～32%, and the utilization of fly ash rate is lower.In addition, also add bauxitic clay and silica in its batching, cost is higher.
Publication number is CN1603437A, denomination of invention for the Patent Application Publication of " a kind of 5000KVA mineral hot furnace is produced the preparation method of silicon-aluminium-barium alloy " a kind of silica, bauxitic clay, barite, steel cuttings and coke of utilizing be the method that raw material is smelted silicon-aluminium-barium alloy, mainly there is the higher defective of cost in it.
Xiong Wenqiang, total utilization of PCA, 1997 (4): 36-39, " flyash is produced si-al-ba-fe " discloses and utilized flyash to add lime, bauxite, barite and bituminous coal in the method for mineral hot furnace carbon heat extraction silicon-aluminium-barium alloy, but added bauxite in its raw material, production cost is higher, and alloy impurity content is higher, C, P are all higher, have exceeded the national standard requirement.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of method of lower-cost production silicon-aluminium-barium alloy.
The method that the present invention produces silicon-aluminium-barium alloy comprises the steps: by weight percentage the barite fine powder mixing of 60～80% flyash and 20～40% and is pressed into base or pelletizing, oven dry, then add the iron filings of flyash and barite fine powder gross weight 5～20% or iron powder, 20～35% carbonaceous reducing agent and 2～5% fluorite, smelt 1～4h again under 1800～2200 ℃, the gained alloy solution obtains silicon-aluminium-barium alloy through refining.
Wherein, the main chemical compositions in above-mentioned flyash is preferably: SiO
245～55wt%, Al
2O
325～30wt%, Fe
2O
32～5wt%, C 1～5wt%, surplus is inevitable impurity.
Wherein, the carbon content of above-mentioned carbonaceous reducing agent is preferably 80～85wt%.
Wherein, above-mentioned carbonaceous reducing agent is preferably coke or hard coal.
Further, above-mentioned carbonaceous reducing agent preferably adds at twice, adds 12～20wt% of flyash and barite fine powder gross weight before smelting, and adds the residue reductive agent after smelting 1～2h again.
Wherein, above-mentioned barite fine powder was preferably the screen underflow of 100 mesh sieves, BaSO in above-mentioned barite
4Content be preferably 95～98wt%.
Wherein, the concise method of above-mentioned alloy solution is preferably: alloy solution is added pre-melted slag refining 20～40min in ladle.Further, the add-on of pre-melted slag is preferably 4～7% of alloy solution weight.
Further, above-mentioned pre-melted slag is preferably Al
2O
3-CaO system or CaF
2-CaO is pre-melted slag.
The chemical composition of the silicon-aluminium-barium alloy that employing the inventive method is produced is Si 20～40wt%, Al 12～34wt%, Ba6～15wt%, C≤0.2wt%, S≤0.02wt%, P≤0.03wt%, surplus is iron and inevitable impurity, and carbide inclusion is few, not efflorescence.
SiC in the silicon-aluminium-barium alloy that the inventive method is produced and Al
4C
3Few Deng carbide content, the barium degree of metalization is high, and sulphur content is low, stable components, not efflorescence of alloy.When adopting the inventive method to realize the comprehensive utilization of flyash high added value, make also that alloy has that carbide inclusion is few, low-sulfur, high barium and non-chalking stability.Because flyash is industrial residue, as the raw material of producing silicon-aluminium-barium alloy, its cost is lower, has also avoided the pollution of flyash to environment.The inventive method has broad application prospects for the production of silicon-aluminium-barium alloy provides a kind of new selection.
Embodiment
The method that the present invention produces silicon-aluminium-barium alloy comprises the steps: by weight percentage the barite fine powder mixing of 60～80% flyash and 20～40% and is pressed into base or pelletizing, oven dry, then add the iron filings of flyash and barite fine powder gross weight 5～20% or iron powder, 20～35% carbonaceous reducing agent and 2～5% fluorite, smelt 1～4h again under 1800～2200 ℃, the gained alloy solution obtains silicon-aluminium-barium alloy through refining.
Wherein, the flyash of the discharging such as thermal power plant all is applicable to the present invention.Impact due to factors such as areal variation, raw materials, the chemical composition of the flyash of various places may there is some difference, but the main chemical compositions of various places flyash is all silicon-dioxide and aluminum oxide, and therefore, the difference of the chemical composition of the flyash of various places does not affect its use in the present invention.
Further, for the quality that makes the silicon-aluminium-barium alloy that the inventive method produces is higher, the main chemical compositions in above-mentioned flyash is preferably: SiO
245～55wt%, Al
2O
325～30wt%, Fe
2O
32～5wt%, C 1～5wt%, surplus is inevitable impurity.
Wherein, the higher reduction effect of the carbon content of above-mentioned carbonaceous reducing agent is better, and the impurity of bringing into is also fewer, can increase production cost but carbon content is too high.Considering cost and reduction effect, the carbon content of above-mentioned carbonaceous reducing agent is preferably 80～85wt%.
Wherein, metallurgical carbonaceous reducing agent commonly used all is applicable to the present invention, as: coke or hard coal.
Further, the disposable carbon that adds is too high, easily form the high-melting-point materials such as silicon carbide, make the temperature of reaction demand too high, and unfavorable to reaction process, therefore, above-mentioned carbonaceous reducing agent preferably adds at twice, 12～the 20wt% that adds flyash and barite fine powder gross weight before smelting adds the residue reductive agent after smelting 1～2h again.
Wherein, wherein, above-mentioned barite fine powder was preferably the screen underflow of 100 mesh sieves, BaSO in above-mentioned barite
4Content be preferably 95～98wt%.
Wherein, can to adopt ordinary method to carry out concise for above-mentioned alloy solution.In order to make scouring result better, the concise method of above-mentioned alloy solution is preferably: alloy solution is added pre-melted slag refining 20～40min in ladle.Further, the add-on of pre-melted slag is preferably 4～7% of alloy solution weight.
Further, above-mentioned pre-melted slag is preferably Al
2O
3-CaO system or CaF
2-CaO is pre-melted slag.
The chemical composition of the silicon-aluminium-barium alloy that employing the inventive method is produced is Si 20～40wt%, Al 12～34wt%, Ba6～15wt%, C≤0.2wt%, S≤0.02wt%, P≤0.03wt%, surplus is iron and inevitable impurity, and carbide inclusion is few, not efflorescence.
Below in conjunction with embodiment, the specific embodiment of the present invention is further described, does not therefore limit the present invention among described scope of embodiments.
Following executing in example, the chemical composition of flyash are SiO by weight percentage
255.48%, Al
2O
328.84%, Fe
2O
34.56%, CaO2.51%, MgO2.34%, C 2.2%, and surplus is impurity.BaSO in barite
4Content is 98.49wt%.
Embodiment 1 adopts the inventive method to produce silicon-aluminium-barium alloy
Calculate by weight percentage, flyash with 60～65% and 35～40% barite fine powder mix, add the water pelletizing, add the iron filings that add flyash and barite fine powder gross weight 5～10%, 2% fluorite and 12～15% coke after oven dry, smelt 1～1.5h at 1800～1850 ℃, then (10～15wt%) of flyash and barite fine powder gross weight improves temperature again, smelts 1～1.5h under 2000～2100 ℃ with addition of residual coke.Alloy solution adds Al in ladle
2O
3-CaO is pre-melted slag refining 0.5 hour, obtains silicon-aluminium-barium alloy after cast.
Smelt three batches, in the gained alloy, Si content is 35～37wt%, and Al content is 20%～22wt%, and Ba content is 12～15wt%, S＜0.02wt%, and P＜0.03wt%, Fe are surplus.
Embodiment 2 adopts the inventive method to produce silicon-aluminium-barium alloy
Calculate by weight percentage, flyash with 65～70% and 30～35% barite fine powder mix, briquetting, add the iron powder that adds flyash and barite fine powder gross weight 5～10%, 3% fluorite and 15～20% hard coal after oven dry, smelt 1～1.5h at 1800～1850 ℃, then (10～12wt%) of flyash and barite fine powder gross weight improves temperature again, smelts 1.5～2h under 2100～2200 ℃ with addition of residual coke.Alloy solution adds CaF in ladle
2-CaO is pre-melted slag refining 20min, obtains silicon-aluminium-barium alloy after cast.
Smelt three batches, in the gained alloy, Si content is 36～37wt%, and Al content is 23～25wt%, and Ba content is 12～14wt%, S＜0.02wt%, and P＜0.03wt%, Fe are surplus.
Embodiment 3 adopts the inventive method to produce silicon-aluminium-barium alloy
Calculate by weight percentage, flyash with 70～75% and 25～30% barite fine powder mix, add the water pelletizing, add the iron filings that add flyash and barite fine powder gross weight 15～20%, 5% fluorite and 17%～20% coke after oven dry, smelt 1h at 1850～1900 ℃, then (7～15wt%) of flyash and barite fine powder gross weight improves temperature again, smelts 1.5～2h under 2000～2100 ℃ with addition of residual coke.Alloy solution adds Al in ladle
2O
3-CaO is pre-melted slag refining 40min, obtains silicon-aluminium-barium alloy after cast.
Smelt three batches, in the gained alloy, Si content is 30～32wt%, and Al content is 18～20wt%, and Ba content is 8～9wt%, S＜0.02wt%, and P＜0.03wt%, Fe are surplus.
Embodiment 4 adopts the inventive method to produce silicon-aluminium-barium alloy
Calculate by weight percentage, flyash with 75～80% and 20～25% barite fine powder mix, add the water pelletizing, add the iron filings that add flyash and barite fine powder gross weight 5%, 5% fluorite and 12～15% coke after oven dry, smelt 1～1.5h at 1800～1850 ℃, then (10～16wt%) of flyash and barite fine powder gross weight improves temperature again, smelts 1.5～2h under 2100～2200 ℃ with addition of residual coke.Alloy solution adds Al in ladle
2O
3-CaO is pre-melted slag refining 0.5 hour, obtains silicon-aluminium-barium alloy after cast.
Smelt three batches, in the gained alloy, Si content is 35～38wt%, and Al content is 27～30wt%, and Ba is 7～8wt%, S＜0.02wt%, and P＜0.03wt%, Fe are surplus.
Claims (4)
1. produce the method for silicon-aluminium-barium alloy, it is characterized in that comprising the steps: by weight percentage the barite fine powder mixing of 60 ~ 80% flyash and 20 ~ 40% and be pressed into base or pelletizing, oven dry, then add iron filings or the iron powder of flyash and barite fine powder gross weight 5 ~ 20%, 20 ~ 35% carbonaceous reducing agent and 2 ~ 5% fluorite, smelt 1 ~ 4h again under 1800 ~ 2200 ℃, the gained alloy molten solution obtains silicon-aluminium-barium alloy through refining, the chemical composition of silicon-aluminium-barium alloy is Si 20 ~ 40wt%, Al12 ~ 34wt%, Ba6 ~ 15wt%, C≤0.2wt%, S≤0.02wt%, P≤0.03wt%, surplus is iron and inevitable impurity,
Wherein, the main chemical compositions in described flyash is: SiO
245 ~ 55wt%, Al
2O
325～30wt%, Fe
2O
32 ~ 5wt%, C 1 ~ 5wt%, surplus is inevitable impurity; Described barite fine powder was the screen underflow of 100 mesh sieves; Described carbonaceous reducing agent adds at twice, adds 12 ~ 20wt% of flyash and barite fine powder gross weight before smelting, and adds the residue reductive agent after smelting 1 ~ 2h again; The method of described alloy molten solution refining is: alloy molten solution is added pre-melted slag refining 20 ~ 40min in ladle, the add-on of pre-melted slag is 4 ~ 7% of alloy molten solution weight, and pre-melted slag is Al
2O
3-CaO system or CaF
2-CaO is pre-melted slag.
2. the method for production silicon-aluminium-barium alloy according to claim 1, it is characterized in that: the carbon content of described carbonaceous reducing agent is 80 ~ 85wt%.
3. the method for production silicon-aluminium-barium alloy according to claim 2, it is characterized in that: described carbonaceous reducing agent is coke or hard coal.
4. the method for production silicon-aluminium-barium alloy according to claim 1, is characterized in that: BaSO in described barite
4Content be 95 ~ 98wt%.
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| CN2010102933895A CN101928837B (en) | 2010-09-27 | 2010-09-27 | Method for producing silicon-aluminum-barium alloy |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1133892A (en) * | 1995-04-18 | 1996-10-23 | 河南省淅川县冶金材料厂 | Process for production of compound deoxidizer of Si-Al-Ba-Fe alloy in one-step in blast furnace |
| CN1657640A (en) * | 2005-03-07 | 2005-08-24 | 北京炎黄投资管理有限公司 | Method for preparing AL-Si-Fe alloy using powdered coal ash as raw material |
-
2010
- 2010-09-27 CN CN2010102933895A patent/CN101928837B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1133892A (en) * | 1995-04-18 | 1996-10-23 | 河南省淅川县冶金材料厂 | Process for production of compound deoxidizer of Si-Al-Ba-Fe alloy in one-step in blast furnace |
| CN1657640A (en) * | 2005-03-07 | 2005-08-24 | 北京炎黄投资管理有限公司 | Method for preparing AL-Si-Fe alloy using powdered coal ash as raw material |
Non-Patent Citations (1)
| Title |
|---|
| 熊文强等.粉煤灰制取硅铝钡铁合金.《粉煤灰综合利用》.1997,(第4期),36-39. * |
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