CN103451355A - Production technology of composite slagging agent for steelmaking - Google Patents
Production technology of composite slagging agent for steelmaking Download PDFInfo
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- CN103451355A CN103451355A CN2013104330928A CN201310433092A CN103451355A CN 103451355 A CN103451355 A CN 103451355A CN 2013104330928 A CN2013104330928 A CN 2013104330928A CN 201310433092 A CN201310433092 A CN 201310433092A CN 103451355 A CN103451355 A CN 103451355A
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- slag
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- dissolving agent
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Abstract
The invention provides a production technology of a composite slagging agent for steelmaking. Wasted aluminum-carborundum-carbon bricks are used and cooled to 0.5-30 DEG C, the bricks are placed in a PC0606 jaw crusher and are crushed to particles of 3-50mm, then the particles are placed in a mill of a 4R3216 Raymond mill and are machined to form powder of 0.1-3.0mm, the powder is mixed with iron ore powder of 3.0mm by the weight ratio of 41:59, the mixture is added into a forced stirring mixer for stirring and mixing, added is controlled in 15 minutes, after stirring for 15 minutes, the mixture is placed in a dry powder ball press machine for pressing, ball bodies of 30+/-5mm are formed, and the ball bodies are dried under the temperature of 20-50 DEG C for use. The use amount of the slagging agent is 15-19kg for each ton of slag.
Description
Technical field
The present invention relates to make steel the recycle of solid waste material, by the waste resistant material of hot metal ladle: aluminum/silicon carbide-carbon brick, be prepared into the dissolving agent of aluminium matter, in convertor steelmaking process, apply, highlight economic benefit.
Background technology
Steelmaking process is used fluorite (Calcium Fluoride (Fluorspan)) as dissolving agent, and it can make thicker slag thinning, to increase flowing of slag, make it to be easy to desulfurization, dephosphorization etc., but because Calcium Fluoride (Fluorspan) in converter slag corrodes furnace lining, cylinder-packing, and Calcium Fluoride (Fluorspan) decomposition at high temperature, certainly lead to a large amount of F
-ion, the dust-removal system by converter steelmaking enters cooling circulating water, to ecotope, water resources is produced to serious pollution.And the ore, the fluorite dissolving agent that use for a long time, quality is unstable, and causing slag difficulty increases consumption, must increase consumption, and the research and development of therefore carrying out the fluoride-free steel-smelting technology are imperative.
Searching document discloses: in the middle of (1) Huang Zhiyong, Yuan Tingwei, Yan Genfa, paper " experimental study of MnO base fluoride-free composite fluxing medium application in the husky steel converter is smelted " literary composition delivered at " the metallurgical scientific and technological Professional School in Anhui journal " 2005 the 16th volumes (1), have " cleaning of the high efficiency of converter smelting and production process; be all the core missions of 21 century steel-smelting technology development; therefore be badly in need of exploitation in converter steelmaking process, cancel fluorite and can antispray, anti-return dry; under antiseized rifle prerequisite, slag making technology fast " content.In the middle of the paper that (2) people such as Yang Zhizheng, Cao Tongyou, Qu Tie deliver at " Wuhan engineering Vocationl Technical College journal " 2011 the 23rd volumes (3) " characteristic and the application of the floride-free fusing assistant of a combined blown converter slag " literary composition, have "; Al in red bauxite
2o
3can (CaO) fusing point in slag is minimum be down to 1395 ℃ " content statement.In the middle of paper " theoretical investigation of the slag temperature of fusion " literary composition that (3) people such as Xu Ran, Song Bo, He Wei deliver on the 28th volume (4) at " China rare earth journal " in 2010, have " for high basicity slag, Al
2o
3the effect that reduces fusing point is better than FeO, and due to Wt(FeO+MnO in actual production process)<1%, should be to regulate Al so reduce high alkalinity desulfurization slag fusing point
2o
3be main " content.(4) national wealth is emerging, and Han Chunliang, in the middle of the paper that the people such as Li Yanjun deliver in " Hebei Metallurgy " 2012 (2) " research and the application of the floride-free slag making technology of a converter semi-steel making " literary composition, has " the SiO in red bauxite
2, Al
2o
3and Fe
2o
3form the compound of some low melting points with the CaO in slag charge, because dissolving agent is multicomponent, low melting point, can effectively promote the lime rapid melting, the making slag time shortens 1.3min before than test." content statement.(5) Lu Lei, Wen Jinbao, have in the middle of paper " the Mechanochemical Effect research of slag " a literary composition that Yao Qiang " steel vanadium titanium " the 26th the 2nd phase of volume in 2005 delivers that " the mechanical force and chemical reaction is the chemical reaction brought out by mechanical force.It is widely that mechanical force comprises scope, can be both the reactive force applied in crushing process, can be again general mechanical pressure, frictional force, can also be the pressure that the liquids and gases shock wave produces.Use the mechanism of production of Mechanochemical Effect, synthetic and decomposition reaction and the surface modification of especially by the method, being undertaken, have positive pushing effect to Deep processing of minerals, chemical industry, Materials science aspect.Thereby the Mechanochemical Effect research of slag is had to very important theory significance and practical value." content statement.From above-mentioned information, do not use aluminum fire resistant materials to make the case of converter steelmaking dissolving agent.
The present invention uses and contains Al in converter
2o
3dissolving agent substitute fluorite, not only can reduce fluorite to lining erosion, improve converter lining life, can reduce the harm that fluorochemical that fluorite produces causes dedusting and water quality simultaneously, environmental benefit is remarkable, field by the application of principle of mechanical force and chemical reaction to waste refractory materials, have distinctive feature, has important production practice and be worth.
Summary of the invention
The object of the invention is to: with Al
2o
3for adding a small amount of iron ore in the waste resistant material of principal constituent, preparation becomes aluminium matter dissolving agent, and use is in converter smelting, for optimizing the extremely significant economic benefit of having recycled of steelworks solid waste rubbish.
The object of the present invention is achieved like this: a kind of production technique of composite slag melting agent for steelmaking, and the 120 tons of converter production lines of take are example, implement step by step;
Preparation of raw material:
1) get discarded refractory materials, after removing the raw material of industrial refuse and iron content, be cooled to 0.5-30 ℃, be placed in the PC0606 jaw crusher, be crushed to the particle of 5-50mm, then be placed in the Raymond mill mill of 4R3216, be processed into the following powder of 3.0mm, standby; The Al of discarded refractory materials wherein
2o
3content is 71%;
2) get the following iron ore of 3.0mm standby, wherein Fe
3o
4content is 68%;
Dissolving agent is produced:
Step 1 is by above-mentioned 1) with 2) raw material mixes with mass percent 41:59, joins stirring and evenly mixing, i.e. discharging in pressure type stirring mixer; Wherein add 1 ton of compound, be controlled at 15min, maintain and stir 15-20min;
Step 2 is placed in the raw material that mixes of step 1 dry powder ball press and suppresses, and makes the spheroid of 30 ± 5mm, dries and uses at the temperature of 20-50 ℃, wherein ball material W%:Al
2o
3be 29 ± 5%; Fe
3o
4be 41 ± 5%.
Described production technique, dosing method, after converter adds slag charge 0.5-3min, add dissolving agent, and its dosage is 15-19kg/ ton slag.
Reaction mechanism of the present invention: will be with Al
2o
3for the waste resistant material of principal constituent carries out broken powder, excite its reactive behavior, then allocate iron ore into, make and become dissolving agent, in convertor steelmaking process, add.After converter adds dissolving agent, at first the heterogeneity in the middle of dissolving agent reacts to each other, and produces new component S iO
2, and Fe
2o
3, they and Al
2o
3together, form some aluminate compounds, 3CaOAl with the CaO in slag charge
2o
3, CaOAl
2o
3, CaO6Al
2o
3, 12CaO7Al
2o
3, CaO2Al
2o
3, Al
2o
3caO etc., can further with the CaO of different quantities, be combined, generate new calcium-aluminate, reduce the fusing point of slag, realize the rapid melting of slag, typical in 12CaO7Al
2o
3(C
12a
7), 1455 ℃ of fusing points, 3CaO.Al
2o
3, 1535 ℃ of fusing points.Because dissolving agent is multicomponent, low melting point, can effectively promote the lime rapid melting, realize the change slag effect in converter steelmaking process.
The present invention has studied the melting principle of lime and white clouds rock ballast auxiliary material in the convertor steelmaking process, has analyzed the lithofacies structure characteristics of converter slag, to certain material that adds 1% in the middle of CaO, makes the scope of CaO melting point depression, in Table 1.
Table 1
| Project | CaF 2 | Al 2O 3 | MgO | Na 2O | Fe 2O 3 | FeO | SiO 2 |
| The reduction fusing point/℃ | 11 | 16.7 | 7.15 | 10 | 7～12 | 20 | 17.1 |
| The scope of application/% | <20 | <50 | <20 | <20 | <40 | <60 | <38 |
Therefore, in conjunction with the characteristics of steelworks hot metal ladle waste resistant material, conceived and take the hot metal ladle waste resistant material as main raw material, with addition of iron ore partly, be auxiliary material, make the Al used in converter steelmaking process
2o
3the matter dissolving agent, this technique, utilized Al to greatest extent
2o
3reduce the effect of slag melting, both met in the convertor steelmaking process for the demand of floride-free dissolving agent, increased again the added value of hot metal ladle waste resistant material recycle, show technical progress.
Embodiment
Below in conjunction with embodiment, the invention will be further described.
Embodiment 1
Line configuration: 3 of the converters that engineered capacity is 120 tons, produce with Al every day
2o
3for 80 tons, the discarded refractory materials of principal constituent;
Technical process of the present invention: add in the discarded refractory materials (aluminum/silicon carbide-carbon brick) of steelworks → fragmentation → abrasive dust → interpolation iron ore pressure ball → oven dry → converter steelmaking process.
1) will produce discarded refractory materials (Al
2o
3content is 71%) roping is to production plant area, at first after picking out the raw material of industrial refuse wherein and iron content, treat that it is cooled to below 30 ℃, the PC0606 jaw crusher of physical dimension 1300 * 1400 * 1400mm that uses Shandong Jiu Chang heavy industry Science and Technology Ltd. to produce, be broken into 5 25 or the following particle of 50mm stand-by.
2) broken waste refractory materials particle is joined in the Raymond mill that model that Shanghai Jianshe Luqiao Machinery Co., Ltd. produces is 4R3216, be processed into 1.5 or the powder of 2.9mm stand-by.
3) purchase that 118 tons of Hami Ya Mansu mining companies produce, Fe
3o
4content 68%, the iron ore of granularity 2.9mm, roping is stand-by to output zone.
By above bi-material; hot metal ladle waste refractory materials powder: the ratio that iron ore is mass percent 41:59 adds " VI type pressure type stirs serial mixer " of being produced by Jiangxi Ren Feng mechanical means company limited; adopt the mode of operation of cycle operation formula to carry out stirring and evenly mixing, i.e. discharging; The time that wherein adds 1 ton of compound is controlled at 15min, maintains the 20min stirring and gets final product.
4) the above raw material that mixes is joined to the spheroid that the steel-making slag powder ball press produced by Zhengzhou City section China electrical equipment company limited or refractory materials ball press are pressed into 30 ± 5mm, stand-by after drying, the W(Al of ball material
2o
3) % is 29% ± 5%; W(Fe
3o
4) % is 41% ± 5%;
5) by the dissolving agent roping that makes to converter steelmaking factory auxiliary material zone, use conveyor that dissolving agent is transported to the high hopper that converter smelting uses stand-by;
6) in converter steelmaking process, slag per ton adds the 17kg dissolving agent, and the joining day is that converter adds in the later 3min of slag charge, from high hopper, adds above dissolving agent, and smelting technology gets final product according to traditional technique.
7) with the amount of 120 tons of converter ton steel 95kg slags, calculate, 120 tons of converter smeltings start, and add after slag charge lime, rhombspar in 3min, add the dissolving agent of 220kg, the purpose of can reaching slag fluxing.
Embodiment 2
Composition Wt () the %(mass percent of the hot metal ladle waste resistant material of steelworks and iron ore), see as table 2.
Table 2
Will be with Al
2o
3waste resistant material process jaw crushing crusher machine for principal constituent, then through the levigate small-particle that becomes 2.9mm of Raymond mill, mix with the iron ore of granularity at 2.9mm, use dry powder ball press to be suppressed into the spheroid of 30 ± 5mm, add in the early stage of convertor steelmaking process.
After above raw material adds converter, under the temperature condition in Converter, the Fe in spheroid
3o
4with the SiC in the middle of anti-material, with C, react, the gas of generation and thermal expansion, make the dissolving agent spheroid cracked, makes main component Al wherein
2o
3with component CaO, MgO in the middle of slag charge, react, the effect that playing slag is fluxed, the principal reaction of generation is as follows:
3Fe
3O
4+4SiC=9Fe+4SiO
2+4CO （1）
Fe
3O
4+4C=3Fe+4CO （2）
3CaO+Al
2O
3=3CaO·Al
2O
3 （3）
CaO+Al
2O
3、=CaO·Al
2O
3 （4）
CaO+6Al
2O
3、=CaO·6Al
2O
3 （5）
12CaO+7Al
2O
3=12CaO·7Al
2O
3 （6）
CaO+2Al
2O
3=CaO·2Al
2O
3 （7）
Al
2O
3+CaO=Al
2O
3·CaO （8）
MgO+SiO
2+CaO=MgO·SiO
2·CaO (9)
Wherein reaction (1), (2) are for reacting main reaction in earlier stage, can improving dissolving agent spheroid speed of response; (3), (6), (9) are for changing the basic reaction in slag stage, can reduce rapidly the fusing point of slag, play the purpose of fluxing and dissolving.
Beneficial effect of the present invention:
1) at present with Al
2o
3for the waste refractory materials of principal constituent, basically as solid waste, processed, processing cost is high, and this technique becomes the agent of fluoride-free slag by its preparation, has reduced the consumption of fluorite, turns waste into wealth, and significant environmental benefit is arranged.
2) the floride-free dissolving agent of this explained hereafter, W (Al
2o
3) % and W(Fe
3o
4) the % stable content, can avoid the negative impact of using the fluorite slag to bring, prevent that for smelting the later stage slag getting dry from having prophylactic effect.
3) owing to adopting the dissolving agent that solid waste is raw material production, be the energy-saving and cost-reducing exemplary role of having made of enterprise.
4) ferric oxide in the middle of dissolving agent, be reduced into as after metallic iron, enters metal pool, can increase the recovery rate of iron and steel stock, reduces the consumption of iron and steel stock.
5) this product is produced the steel-smelting production process of hot metal containing low silicon for the maximization blast furnace, is significantly improved effect, is embodied in the defect that SiC in the middle of product can make up the slag making difficulty that the Si in the middle of molten iron causes containing quantity not sufficient.
Claims (2)
1. the production technique of a composite slag melting agent for steelmaking, it is characterized in that: the 120 tons of converter production lines of take are example, implement step by step;
Preparation of raw material:
1) get discarded refractory materials, after removing the raw material of industrial refuse and iron content, be cooled to 0.5-30 ℃, be placed in the PC0606 jaw crusher, be crushed to the particle of 5-50mm, then be placed in the Raymond mill mill of 4R3216, be processed into the following powder of 3.0mm, standby; The Al of discarded refractory materials wherein
2o
3content is 71%;
2) get the following iron ore of 3.0mm standby, wherein Fe
3o
4content is 68%;
Dissolving agent is produced:
Step 1 is by above-mentioned 1) with 2) raw material mixes with mass percent 41:59, joins stirring and evenly mixing, i.e. discharging in pressure type stirring mixer; Wherein add 1 ton of compound, be controlled at 15min, maintain and stir 15-20min;
Step 2 is placed in the raw material that mixes of step 1 dry powder ball press and suppresses, and makes the spheroid of 30 ± 5 mm, dries and uses at the temperature of 20-50 ℃, wherein ball material W%:Al
2o
3be 29 ± 5%; Fe
3o
4be 41 ± 5%.
2. production technique according to claim 1 is characterized in that: dosing method, after converter adds slag charge 0.5-3min, add dissolving agent, and its dosage is 15-19kg/ ton slag.
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Cited By (6)
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| CN104084572A (en) * | 2014-07-18 | 2014-10-08 | 武钢集团昆明钢铁股份有限公司 | Molten iron jar melting agent and preparation method and application thereof |
| CN104789732A (en) * | 2015-05-20 | 2015-07-22 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for slagging in semisteel steelmaking converter |
| CN105586464A (en) * | 2014-10-23 | 2016-05-18 | 红安县生伦冶金矿产科技实业有限公司 | Preparation method for composite slag melting agent |
| CN109321705A (en) * | 2018-12-10 | 2019-02-12 | 攀枝花钢城集团有限公司 | Environment-friendly type pneumatic steelmaking slagging agent and preparation method thereof |
| CN114131008A (en) * | 2021-11-30 | 2022-03-04 | 河南通宇冶材集团有限公司 | Efficient slagging agent for semisteel tank and preparation method thereof |
| CN116479236A (en) * | 2023-03-15 | 2023-07-25 | 靖西天桂铝业有限公司 | Method for preparing steelmaking fluoride-free slag melting agent from tailings mud and high-iron Bayer process red mud |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104084572A (en) * | 2014-07-18 | 2014-10-08 | 武钢集团昆明钢铁股份有限公司 | Molten iron jar melting agent and preparation method and application thereof |
| CN104084572B (en) * | 2014-07-18 | 2016-05-11 | 武钢集团昆明钢铁股份有限公司 | A kind of hot metal bottle burning device capable of removing chalybeate and preparation method thereof and application |
| CN105586464A (en) * | 2014-10-23 | 2016-05-18 | 红安县生伦冶金矿产科技实业有限公司 | Preparation method for composite slag melting agent |
| CN104789732A (en) * | 2015-05-20 | 2015-07-22 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for slagging in semisteel steelmaking converter |
| CN109321705A (en) * | 2018-12-10 | 2019-02-12 | 攀枝花钢城集团有限公司 | Environment-friendly type pneumatic steelmaking slagging agent and preparation method thereof |
| CN114131008A (en) * | 2021-11-30 | 2022-03-04 | 河南通宇冶材集团有限公司 | Efficient slagging agent for semisteel tank and preparation method thereof |
| CN116479236A (en) * | 2023-03-15 | 2023-07-25 | 靖西天桂铝业有限公司 | Method for preparing steelmaking fluoride-free slag melting agent from tailings mud and high-iron Bayer process red mud |
| CN116479236B (en) * | 2023-03-15 | 2024-05-31 | 靖西天桂铝业有限公司 | Method for preparing steelmaking fluoride-free slag melting agent from tailings mud and high-iron Bayer process red mud |
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Effective date of registration: 20220621 Address after: No. 1567, Toutunhe Road, Toutunhe District, Urumqi City, Xinjiang Uygur Autonomous Region Patentee after: XINJIANG ZHONGHE DAZHENG METALLURGY TECHNOLOGY CO.,LTD. Address before: Room 202, unit 1, building 1, No. 192, Wuxing South Road, Tianshan District, Urumqi City, Xinjiang Uygur Autonomous Region Patentee before: XINJIANG ZHONGHE DAZHENG COMMERCE AND TRADE CO.,LTD. |