CN100587095C - Direct feed-in-stove application method for dust separation briquetting of stainless steel - Google Patents
Direct feed-in-stove application method for dust separation briquetting of stainless steel Download PDFInfo
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- CN100587095C CN100587095C CN200810139070A CN200810139070A CN100587095C CN 100587095 C CN100587095 C CN 100587095C CN 200810139070 A CN200810139070 A CN 200810139070A CN 200810139070 A CN200810139070 A CN 200810139070A CN 100587095 C CN100587095 C CN 100587095C
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Abstract
The invention discloses a direct inputting application method of stainless steel dust-removing ash pressed block. The direct inputting application method is characterized in that stainless steel dust-removing ashes, aluminum powder, mechanically processed iron chips, silicon calcium alloy powder, a bonding agent, lime stone powder and fluorspar are blended according to the proportion that the stainless steel dust-removing ashes account for 50 to 80 percent, the aluminum powder accounts for 5 to 8 percent, the mechanically processed iron chips occupy 5 to 10 percent, the silicon calcium alloy powder accounts for 6 to 13 percent, the bonding agent accounts for 1 to 3 percent, the lime stone powder accounts for 0 to 10 percent, and the fluorspar accounts for 1 to 8 percent, the components aremixed and pressed into blocks in a sealing way to obtain the stainless steel dust-removing ash pressed block, the manufactured stainless steel dust-removing ash pressed block is directly applied intothe stainless steel electric furnace smelting production and the weather-resistant steel converter production, the secondary powder pollution does not exist through the method, the waste iron chips generated during the machining process can be also comprehensively utilized, the utilizable elements in the stainless steel dust-removing ashes can directly participate in the reaction, a great amountof heat is generated to maintain the furnace temperature, therefore the utilizable metal elements are fully applied, and the production cost is greatly reduced. And the invention can be comprehensively applied in the stainless steel electric furnace smelting production and the weather-resistant steel converter production.
Description
Technical field
The present invention relates to a kind of dedusting ash of stainless steel application method that is produced in electric furnace production stainless steel process, the method that particularly a kind of dust separation briquetting of stainless steel is used directly into stove can be widely used in the process of electric furnace and converter production.
Technical background
Adopt electric furnace and converter steelmaking, it is the production process of a kind of high energy consumption, high pollution, after the flue dust that produces in the production process is handled by dust-removal system, a large amount of dedusting ash will be produced, put down in writing according to pertinent data, produce one ton of stainless steel average generation 30-40kg dedusting ash, in this dedusting ash, contain the Cr of 40-60% on the one hand
2O
3, available elements such as NiO, FeO, on the other hand again because of the Cr in the dedusting ash
6+Ion is poisonous pollutant component, can cause poisonous pollution to environment.At present, for the common treating method of dedusting ash in smelting stainless steel or the weathering steel process is that transportation is toppled over, obviously, the weak point that adopts transportation to topple over method is: can produce a large amount of airborne dusts in transportation He in the toppling process, contaminate environment, simultaneously, the utilized element in the dedusting ash is wasted, and has improved production cost.In order to prevent the pollution of dedusting ash, can utilize available element wherein again, at present the method that adopts has following several: the one, in dedusting ash of stainless steel with addition of the aluminium ash (byproduct of metallic aluminium production process of 30-40%, mainly be aluminium sesquioxide and metallic aluminium), drop into electric furnace behind the briquetting and use, the shortcoming of this method is that the smelting process quantity of slag obviously increases, prolongs the electrosmelting time; The 2nd, dedusting ash of stainless steel is pressed into ball, the electric furnace of directly packing into, again with addition of a small amount of steel scrap, the fusing back adds chromium, the nickel metal in ferrosilicon and the metallic aluminium reduction dedusting ash of stainless steel, is cast into ingot then, uses as the stainless steel smelting raw material, this recovery method can only be used as raw materials for metallurgy, smelting cycle is long, and the electric power consumption per ton steel height can reach 〉=2000kWh; The 3rd, the method for a kind of smelting chromium-nickel-iron alloy from stainless steel dust-removing ash that number of patent application 200710139520.0 provides, cardinal principle is: according to Cr
2O
3NiO, metal oxides such as FeO are easily by carbon, the principle of Si reduction, with carbon as reductive agent, utilize the electric-arc heating temperature can be up to the characteristics more than 2000 ℃, dissolve into mother liquor at electrosmelting home scrap in early stage, in mother liquor, mix briquetting then by batch adding dedusting ash of stainless steel and carbon steel dedusting ash, while is with addition of the charred ashes of 1-2kg/t, send electric 15-20min power failure thermometric at every turn, sampling analysis, observe the working of a furnace, add the ferrosilicon powder of 2.0-3.0kg/t and the lime of 0.5-1.0kg/t simultaneously, thereby reach the purpose of utilizing dedusting ash of stainless steel, but the deficiency of this method is: pure dust separation briquetting of stainless steel is to utilize ash and silicon to remove to reduce useful metal element in the dedusting ash of stainless steel under hot conditions, so waste time and energy, be not easy to operation, owing to must at high temperature carry out, cost can not get reducing; The 4th, chromium, nickel element electrosmelting recovery method in the number of patent application 200710062144.X dedusting ash of stainless steel, directly dedusting ash of stainless steel is added and be pressed into ball after the water of 4%-6% and 3%-5% binding agent mix, the dust separation briquetting of stainless steel that when batching, adds all iron and steel stock weight 2%-15%, mixed carbon comtent is controlled at the 1.5%-2.5% of shove charge iron and steel stock weight in the electrosmelting process, add 8kg-15kg/ ton steel and reduce, utilize under the hot conditions and reduce with carbon and ferrosilicon.
Summary of the invention
The object of the present invention is to provide a kind of can overcome dedusting ash of stainless steel directly transportation topple over the problem of environmental pollution that brings, the heat that can utilize in the id reaction again to be produced is kept furnace temperature, directly make full use of useful element wherein, and time saving and energy saving, be convenient to the method that a kind of dedusting ash of stainless steel of operating, can effectively reducing production costs is used directly into stove.
For reaching above purpose, the technical solution adopted in the present invention is: the method that this a kind of dedusting ash of stainless steel is used directly into stove is characterized in that being finished by following steps:
(1), take by weighing raw material: its weight proportion is: dedusting ash of stainless steel is that 50-80%, aluminium powder are that the iron filings of 5-8%, mechanical workout are that 5-10%, silicocalcium powder are that 6-13%, binding agent are that 1-3%, limestone powder are that 0-10%, fluorite are 1-8%, has taken by weighing behind each raw material standby by this weight proportion by the proportioning raw materials of dust separation briquetting of stainless steel;
(2), sealing mixes, produce mixed powder: at first will be set by step ratio takes by weighing in (1) dedusting ash of stainless steel, aluminium powder, the iron filings of mechanical workout, silicocalcium powder, limestone powder, fluorite contain in the container of sealing and mixed 5-30 minute, make it even, add the binding agent that takes by weighing by proportioning again, continued to mix 5-10 minute, and promptly made mixed powder;
(3), the compacting of dust separation briquetting of stainless steel: with the middle mixed powder for preparing of step (2), place in the pressing mold, adopt pressing machine to be pressed into bulk, promptly make dust separation briquetting of stainless steel, the weight of every stainless steel dedusting briquetting is 1-10kg;
(4), throwing stove uses: the dust separation briquetting of stainless steel that makes in step (3) be applied directly to the electrosmelting stainless steel produce in the time, behind the melt portions molten steel, have a power failure, drop into the dust separation briquetting of stainless steel of the 18-21% of batching total amount in batches, press the conventional smelting technology melting of electric furnace again; The dust separation briquetting of stainless steel that makes in step (3) is applied directly to converter when producing in the weathering steel, and the stainless steel dedusting that adds tap 2-5% in smelting process can briquetting, directly into stove, reduces the add-on of ferrochrome, ferronickel, ferrophosphorus.
After dust separation briquetting of stainless steel was gone into stove, its reaction principle was: under the furnace high-temperature condition, and the Cr in the dust separation briquetting of stainless steel
2O
3, NiO, FeO are reduced agent aluminium and silicon, calcium reduce, and emits a large amount of heats, carries out rapid reaction with the iron filings of mechanical workout, forms the composition that contains chromium nickel and directly enters molten steel, a large amount of heat energy of emitting in this reaction are kept furnace temperature;
Its chemical equation is:
2AL+Cr
2O
3=Al
2O
3+ Cr+ heat
2AL+3NiO=Al
2O
3+ 3Ni+ heat
2Si+Ca+5FeO=2SiO
2+ CaO+5Fe+ heat
Its reaction heat energy can form melt metal solution;
Silicocalcium powder in the dust separation briquetting of stainless steel in adition process with stove in melting slag reaction, guarantee to add the reducing atmosphere at dust separation briquetting of stainless steel position;
Fluorite in the dust separation briquetting of stainless steel mainly is the fusing point of the bits of dust separation briquetting of stainless steel that reduction adds, and increases the velocity of separation of metal and bits;
Basicity of slag keeps high basicity in the limestone powder principal security reaction process in the dust separation briquetting of stainless steel;
The effect of the binding agent in the dust separation briquetting of stainless steel mainly is as binding agent various raw materials to be bondd, and guarantees good cold strength, can further reduce the fusing point that forms bits, and the promotion bits separate with metallic solution; Employed binding agent is a water glass in the dust separation briquetting of stainless steel.
The present invention can be applied to the weathering steel that converter production contains chromium nickel according to different add-ons, also can be used as electric furnace and produces stainless raw material directly into the chromium nickel content in the stove increase molten steel.
Beneficial effect of the present invention is: compared following advantage with the treatment process of present dedusting ash: 1, can use, can not produce the secondary dust pollution directly into stove, and also convenient to the processing of dedusting ash of stainless steel; 2, can fully utilize the waste iron filing material that is produced in the mechanical processing process, reduce of the pollution of waste iron filing material environment; 3, make and to utilize element in stove, directly to participate in reaction in the dedusting ash of stainless steel, and produce a large amount of heat energy, keep furnace temperature.So method not only makes useful metallic elements obtain abundant application, also significantly reduced production cost.
Embodiment
Embodiment 1
Adopt electric furnace to produce 06Cr19Ni10, the chemical ingredients of dedusting ash of stainless steel is as follows: TFe 42, FeO23, CaO 12.5, SiO
26.2, MgO 4.2, Al
2O
312, MnO 2.8, Cr
2O
315.78, NiO 3.87, P
2O
50.025, S 0.10.
The above-mentioned dedusting ash that is produced is aborning melted down application according to the following steps:
(1), take by weighing each raw material, its weight proportion is: the iron filings 7% of dedusting ash of stainless steel 72%, aluminium powder 6%, mechanical workout, silicocalcium powder 8%, water glass 1%, fluorite 2%, limestone powder 4% by the proportioning raw materials of dust separation briquetting of stainless steel;
(2), sealing mixes, produce mixed powder: dedusting ash of stainless steel, aluminium powder, the iron filings of mechanical workout, silicocalcium powder, limestone powder, fluorite of earlier will set by step taking by weighing than row in (1) are contained in sealed can, mixed 20 minutes, in sealed can, add water glass again, mixed again 8 minutes, and promptly made mixed powder;
(3), the compacting of dust separation briquetting of stainless steel: the mixed powder of producing in the step (2) is placed in the pressing mold, utilize pressing machine that mixed powder directly is pressed into bulk, promptly get dust separation briquetting of stainless steel, every weight is 5kg;
(4), throwing stove uses: in 70 tons of uhp electric arc furnaces smelting 06Cr19Ni10, can drop into the 65T material, by 20% input amount that calculates dust separation briquetting of stainless steel that drops into material is 13T, behind 10 tons of Cr18Ni19 stainless steel steel scraps of fusing, have a power failure earlier, drop into dust separation briquetting of stainless steel in batches, until 13T is all dropped into, keep temperature in the stove by id reaction heat, by the sampling analysis molten steel composition, it changes as following table:
| Stage | C | Si | p | Cr | Ni |
| The melting stainless steel steel scrap | 0.08 | 0.65 | 0.40 | 17.82 | 7.65 |
| After adding dust separation briquetting of stainless steel | 0.10 | 0.68 | 0.38 | 18.52 | 7.58 |
The variation of contrast composition, the chromium in the molten steel fuses in the molten steel through reduction, has improved the chrome content of molten steel, and nickel element slightly reduces.
Behind sampling analysis, concrete recovery rate is as follows:
| Principal element | Fe | Cr | Ni |
| Recovery rate | 96％ | 85％ | 97％ |
The recovery rate of element is higher than employing carbon and ferrosilicon reductive recovery rate.
Add other furnace charges of residue according to routine operation then, produce qualified 06Cr19Ni10 stainless steel at last.
Reduce furnace power in process of production, utilize the heat of molten steel to carry out rapid reaction, no longer produce flue dust, brownout 2100 degree, the add-on of 4.34 tons of stainless steel waste materials of minimizing directly reduces by 22395 yuan/stove, amounts to 344.5 yuan of/ton stainless steels that reduce cost.
Embodiment 2
Adopt converter to produce weathering steel 09CuPCrNi, the chemical ingredients of dedusting ash of stainless steel is as follows: TFe 41, FeO 20, CaO 10.5, SiO2 7.2, MgO 4.2, Al
2O
31.5, MnO3.2, Cr
2O
317.28, NiO 2.57, P
2O
50.055, S 0.08
The above-mentioned dedusting ash that is produced is aborning used according to the following steps:
(1), take by weighing each raw material, its weight proportion is: the iron filings 8% of dedusting ash of stainless steel 78%, aluminium powder 5%, mechanical workout, silicocalcium powder 6.5%, binding agent 1.5%, fluorite 1% by the proportioning raw materials of dust separation briquetting of stainless steel;
(2), sealing mixes, produce mixed powder: dedusting ash of stainless steel, aluminium powder, the iron filings of mechanical workout, silicocalcium powder, fluorite of earlier will set by step taking by weighing than row in (1) are contained in sealed can, mixed 15 minutes, in sealed can, add binding agent again, proceeded again to mix 8 minutes, and promptly made mixed powder;
(3), the compacting of dust separation briquetting of stainless steel: the mixed powder of producing in the step (2) is placed in the pressing mold, utilize pressing machine that mixed powder directly is pressed into bulk, promptly get dust separation briquetting of stainless steel, the weight of every stainless steel dedusting briquetting is 4kg;
(4), throwing stove uses: in 60 tons of converters of smelting 09CuPCrNi-A, according to 55 tons of calculating of tap, every stove reduces 180kg ferrochrome (containing chromium 60%), every stove reduces the smelting of preparing burden of 30kg nickel plate, in the tapping process, drop into the dust separation briquetting 1200kg of tap 2.2% with tapping process, reduce ferrophosphorus (containing P the is 20%) add-on of 50kg simultaneously, change as following table by the sampling analysis molten steel composition:
In dust separation briquetting of stainless steel, do not add limestone powder, reduced the basicity of bits in the ladle, make the phosphorus in the bits partly turn back in the molten steel, chromium element in the comparative analysis dedusting ash of stainless steel and nickel element fuse in the molten steel through reduction, increase principal element phosphorus, chromium and nickel element content in the weathering steel composition, in view of this can replace the respective numbers alloy to satisfy the composition requirement of weathering steel.
Add other furnace charges of residue according to routine operation order of addition(of ingredients), produce qualified 09CuPCrNi-A weathering steel at last.
No longer produce flue dust in process of production, every stove is saved 180 kilograms of ferrochrome, 30 kilograms of nickel plates, 50 kilograms ferrophosphorus, directly reduces by 7176 yuan/stove, amounts to 130.5 yuan of/ton weathering steels that reduce cost.
Claims (1)
1, a kind of dust separation briquetting of stainless steel is characterized in that being finished by following steps directly into the method for stove application:
(1), take by weighing raw material: its weight proportion is: dedusting ash of stainless steel is that 50-80%, aluminium powder are that the iron filings of 5-8%, mechanical workout are that 5-10%, silicocalcium powder are that 6-13%, water glass are that 1-3%, limestone powder are that 0-10%, fluorite are 1-8%, has taken by weighing behind each raw material standby by this weight proportion by the proportioning raw materials of dust separation briquetting of stainless steel;
(2), sealing mixes, produce mixed powder: at first will be set by step ratio takes by weighing in (1) dedusting ash of stainless steel, aluminium powder, the iron filings of mechanical workout, silicocalcium powder, limestone powder, fluorite contain in the container of sealing and mixed 5-30 minute, make it even, add the water glass that takes by weighing by proportioning again, continued to mix 5-10 minute, and promptly made mixed powder;
(3), the compacting of dust separation briquetting of stainless steel: with the middle mixed powder for preparing of step (2), place in the pressing mold, adopt pressing machine to be pressed into bulk, promptly make dust separation briquetting of stainless steel, the weight of every stainless steel dedusting briquetting is 1-10kg;
(4), throwing stove uses: the dust separation briquetting of stainless steel that makes in step (3) be applied directly to the electrosmelting stainless steel produce in the time, behind the melt portions molten steel, have a power failure, drop into the dust separation briquetting of stainless steel of the 18-21% of batching total amount in batches, press the conventional smelting technology melting of electric furnace again; The dust separation briquetting of stainless steel that makes in step (3) is applied directly to converter when producing in the weathering steel, adds the dust separation briquetting of stainless steel of tap 2-5% in smelting process, directly into stove, reduces the add-on of ferrochrome, ferronickel, ferrophosphorus.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810139070A CN100587095C (en) | 2008-08-29 | 2008-08-29 | Direct feed-in-stove application method for dust separation briquetting of stainless steel |
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|---|---|---|---|
| CN200810139070A CN100587095C (en) | 2008-08-29 | 2008-08-29 | Direct feed-in-stove application method for dust separation briquetting of stainless steel |
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| CN100587095C true CN100587095C (en) | 2010-02-03 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101665868B (en) * | 2009-07-30 | 2011-04-27 | 山西太钢不锈钢股份有限公司 | Method for utilizing stainless steel removed dust as ironmaking raw material |
| CN102127616B (en) * | 2011-03-01 | 2012-12-19 | 中冶赛迪工程技术股份有限公司 | Method for comprehensively treating iron-containing dust by using electric arc furnace |
| CN103014356B (en) * | 2012-12-27 | 2014-11-05 | 四川西南不锈钢有限责任公司 | Method for recovering chromium and nickel from settled dust of stainless steel |
| CN105506271B (en) * | 2014-09-24 | 2018-05-08 | 宝钢不锈钢有限公司 | Chrome ore composite pellet and its production method and application are used in a kind of argon oxygen decarburizing furnace reduction |
| CN105671309A (en) * | 2016-04-05 | 2016-06-15 | 石嘴山市宝马兴庆特种合金有限公司 | Process research for producing multi-component composite material by virtue of silicon powder |
| CN111139332B (en) * | 2020-01-21 | 2021-04-27 | 鞍钢股份有限公司 | Slag former and light and thin scrap steel mixed processing furnace entering process |
| CN113584253B (en) * | 2021-06-21 | 2022-07-08 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Method for producing chromium-containing high-carbon steel by using stainless steel dedusting ash |
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2008
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