CN103451429A - Method for smelting aluminum-calcium-iron alloy - Google Patents
Method for smelting aluminum-calcium-iron alloy Download PDFInfo
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- CN103451429A CN103451429A CN2013103654239A CN201310365423A CN103451429A CN 103451429 A CN103451429 A CN 103451429A CN 2013103654239 A CN2013103654239 A CN 2013103654239A CN 201310365423 A CN201310365423 A CN 201310365423A CN 103451429 A CN103451429 A CN 103451429A
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- calcium
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- reducing agent
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Abstract
The invention discloses a method for smelting an aluminum-calcium-iron alloy, belonging to the technical field of metal material metallurgy. The method is characterized by firstly taking lime (CaO) and a carbonaceous reducing agent as raw materials, generating calcium carbide (CaC2) in a submerged arc furnace and then taking liquid calcium carbide (CaC2), Al2O3, Fe2O3 and a small amount of carbonaceous reducing agent as raw materials to smelt the aluminum-calcium-iron alloy in the same submerged arc furnace. The aluminum-calcium-iron alloy smelt by the method comprises the following components by mass percent: 35-40% of calcium, 20-25% of aluminum and the balance of iron. The aluminum-calcium-iron alloy produced by the method has the characteristics of low energy consumption and long smelting period in the submerged arc furnace, is simultaneously used for steelmaking and deoxygenation, can form low-melting-point calcium aluminate, is favorable for adsorbing desulfurization products, increases the desulfurization rate, and reduces the content of inclusions in molten steel.
Description
Technical field:
The present invention relates to a kind of method of smelting Al-Ca-Fe alloy, belong to the metallic substance metallurgical technology field.
Background technology:
For effectively steel being carried out to deoxidation, to nonmetallic inclusionsin steel controlled, sex change and removal, must select the alloy of " high purity, high precision, high function " according to the demand of requirement and the steel-making of steel grade, guarantee carrying out smoothly of steel-making, continuous casting.To the production of high-quality steel, steel alloy, Clean Steel, special steel, often adopt SiMn, A1Mn, SiAlFe, AlFe, A1 etc. to carry out the deoxidation operation to steel, thereby easily cause Al higher in molten steel
2o
3be mingled with and high residual aluminium amount, finally often need further with the Ca alloy, to carry out the Ca processing, if to Al
2o
3be mingled with and deal with improperly, the consequences such as dross, water blocking mouthh in the time of can causing cast.When directly adopting AlCa series composite alloy to carry out deoxidation to steel, can carry out the Ca processing, change Al
2o
3the form of inclusion, reduce nonmetal inclusion in steel, improves the quality of steel.The deoxidation potentiality of AlCa composite deoxidant are large, can control and save the alloy consumption, reduce steel-making cost, thereby promote iron alloy science and technology to advance.
At present, the method of smelting Al-Ca-Fe alloy is mainly to the method for mixing, with remelting acquisition in electric furnace after " Al powder+pure Ca powder+Fe powder " mechanical mixture, the method needs pure aluminium and calcium metal, not only increased the loss of calcium metal in the secondary remelting, also increased the remelting hear rate, complex technical process, cost is higher.In addition, part Study personnel have proposed relevant improvement technique, kalzium metal as number of patent application 201010158375.2 deoxidation in steel making, it comprises metal aluminum shot, silicon carbide, Wingdale, calcium slag, in the kalzium metal of deoxidation in steel making, A1 weight percentage >=18%, Si >=12%, Ca >=10%.In kalzium metal prepared by the method, calcium contents is lower, and do not avoid adopting the shortcoming of pure metal raw material fully, although energy consumption is compared lower slightly with direct doping method, but whole raw materials cost is still higher, contain the Si that surpasses 12% in alloy, be unfavorable for smelting the conditional steel grade of silicone content, application has certain limitation.Number of patent application 201010256500.3 is for the iron alclad calcium alloy and preparation method thereof of steel-making, for strengthening the proportion of kalzium metal, avoid directly adopting doping method to produce the serious present situation of Al-Ca-Fe alloy process scaling loss, employing coats kalzium metal method with steel plate, improve the deoxidation effect of kalzium metal, but the method still be take doping method as basis, does not fundamentally improve the production method of kalzium metal.
Summary of the invention:
The principle of C-O reaction between Main Basis high temperature lattice of the present invention, realize in same stove directly smelting Al-Ca-Fe alloy.The purpose of this invention is to provide a kind of Al-Ca-Fe alloy that can reduce power consumption, reduction labour intensity, improve steelmaking process deoxidation efficiency, substitute the main production technique with doping method production kalzium metal at present.
At first technical scheme of the present invention is achieved in that, in the mineral hot furnace stove, with lime (CaO) and carbonaceous reducing agent, generates calcium carbide (CaC
2), CaO content>=85% in lime wherein, carbonaceous reducing agent can be selected charcoal, bituminous coal or coke, guarantees CaC in product
2content>=96%, for improving the mobility of slag, with addition of the CaF of total quantity of slag 8%-15%
2; Second step is with liquid calcium carbide (CaC
2), Al
2o
3, Fe
2o
3, a small amount of carbonaceous reducing agent is raw material, in same ore deposit heat, protects interior smelting Al-Ca-Fe alloy.
The main chemical reactions formula that Al-Ca-Fe alloy is smelted in this invention is:
CaO+3C=CaC
2+CO △G
0=111315-56.8T
Al
2O
3+Fe
2O
3+3CaC
2=3Ca+2Al+2Fe+6CO △G
0=415600-251.63T
The first step main purpose of this invention is to prepare high-purity C aC
2take lime as raw material, with addition of a certain amount of carbonaceous reducing agent (charcoal, bituminous coal, coke or three's mixture), guarantee CaO: the rich carbon operation of fixation of C (mol ratio)=1:3.3-3.6, guarantee temperature of reaction T>=1600 ℃, the reaction times is 30-45min simultaneously;
Second step is to prepare CaC in the first step
2on the basis of content>=96%, toward the electrode centers zone, add Al
2o
3, Fe
2o
3and carbonaceous reducing agent, wherein in reactant, the add-on of each material is respectively CaC
230-40%, Fe
2o
320-35%, Al
2o
330-45%, carbonaceous reducing agent 3-5%.
The operating procedure of this invention is:
(1) CaC
2preparation section
The 1 zero rich carbon batchings in strict accordance with mixed carbon comtent 3.3-3.6, according to reaction process slag mobility status, with addition of the CaF of 8%-15%
2, guarantee CaO content>=85% in lime simultaneously;
2 zero join around electrode after furnace charge is mixed, and smoldering lifts temperature to more than 1600 ℃, guarantee that the reaction times is between 30-45min, sampling analysis product C aC
2content;
(2) Al-Ca-Fe alloy preparation section
1 zero work as CaC
2content is determined CaC in stove by analytical results and Theoretical Calculation after reaching processing requirement (>=96%)
2content, in proportion toward the electrode centers zone with addition of Al
2o
3, Fe
2o
3, for preventing smelting process, the carbon phenomenon appears losing, need simultaneously toward electrode centers with addition of a small amount of carbonaceous reducing agent;
2 zero further promote furnace temperature to 1800-1900 ℃, guarantee that the reaction times is 60-90min;
3 zero tap a blast furnace and pour into a mould;
This invention smelted furnace cinder is mainly containing CaC
2aluminate, CaC wherein
2≤ 10%, total quantity of slag is controlled at<and 15%.After tapping a blast furnace, add immediately washery slag agent (the mass ratio CaF of product Al-Ca-Fe alloy total amount 5%
2: Fe
2o
3: C=45:45:10) molten slag removal and arrangement furnace bottom.
This invention compared with prior art has following advantage:
1 zero have realized smelting Al-Ca-Fe alloy in same stove, can utilize CaC
2sensible heat in the preparation section stove, the traditional technology energy consumption of having avoided the employing pure metal to smelt is high, secondary remelting process valuable metal loses large shortcoming;
In 2 zero alloys, the reduction of Al, Fe metal is mainly Al
2o
3, Fe
2o
3with liquid CaC
2at high temperature interaction produces, and intermediate product do not occur, has reduced the working of a furnace unusual phenomenon caused because producing intermediate product;
3 zero Fe
2o
3add to play simultaneously and reduce reaction initial temperature and slag viscosity, improve the effect of slag fluidity, thereby created good kinetics and thermodynamic condition for reaction in furnace, reduced CaF
2add-on, improved operating environment.
Embodiment
Embodiment 1:
Press lime (CaO content 88.3%): 180kg, coke (fixation of C 83.5%): 159kg, CaF
2: 27kg, CaO:C=1:3.3 wherein, CaF
2add-on 8%.Join after mixing in mineral hot furnace and smelt 40min, preparation CaC
2, analyze its CaC
2content is 96.5%, meets the subsequent technique requirement.Be converted into CaC fully with Ca
2for benchmark is determined CaC
2after growing amount, by every hundred kilograms of ingredient compositions, calculate, at liquid CaC
2on basis for 40kg, add Al
2o
3: 30kg, Fe
2o
3: 27kg, coke (fixation of C 83.5%): 3kg, be warming up to 1800-1900 ℃, and reaction 60-90min, to CaC in slag
2during content≤10%, scarfing cinder is tapped a blast furnace, and the casting mold chemical examination, obtain Al-Ca-Fe alloy, and its chemical composition (%) is: Ca40, and Al20, Fe32, other impurity are not done chemical examination.
Embodiment 2:
Press lime (CaO content 88.3%): 180kg, coke (fixation of C 83.5%): 173kg, CaF
2: 54kg, CaO:C=1:3.6 wherein, CaF
2add-on 15%.Join after mixing in mineral hot furnace and smelt 40min, preparation CaC
2, analyze its CaC
2content is 97.3%, meets the subsequent technique requirement.Be converted into CaC fully with Ca
2for benchmark is determined CaC
2after growing amount, by every hundred kilograms of ingredient compositions, calculate, at liquid CaC
2on basis for 35kg, add Al
2o
3: 45kg, Fe
2o
3: 15kg, coke (fixation of C 83.5%): 5kg, be warming up to 1800-1900 ℃, and reaction 60-90min, to CaC in slag
2during content≤10%, scarfing cinder is tapped a blast furnace, and the casting mold chemical examination, obtain Al-Ca-Fe alloy, and its chemical composition (%) is: Ca35, and Al25, Fe27, other impurity are not done chemical examination.
Embodiment 3:
Press lime (CaO content 88.3%): 180kg, coke (fixation of C 83.5%): 163kg, CaF
2: 34kg, CaO:C=1:3.4 wherein, CaF
2add-on 10%.Join after mixing in mineral hot furnace and smelt 40min, preparation CaC
2, analyze its CaC
2content is 96.9%, meets the subsequent technique requirement.Be converted into CaC fully with Ca
2for benchmark is determined CaC
2after growing amount, by every hundred kilograms of ingredient compositions, calculate, at liquid CaC
2on basis for 38kg, add Al
2o
3: 40kg, Fe
2o
3: 18kg, coke (fixation of C 83.5%): 4kg, be warming up to 1800-1900 ℃, and reaction 60-90min, to CaC in slag
2during content≤10%, scarfing cinder is tapped a blast furnace, and the casting mold chemical examination, obtain Al-Ca-Fe alloy, and its chemical composition (%) is: Ca37, and Al22, Fe29, other impurity are not done chemical examination.
Claims (6)
1. a method of smelting Al-Ca-Fe alloy is characterized in that: first take lime (CaO) and carbonaceous reducing agent in same stove is raw material, adopts rich carbon operation, generation CaC
2, then by a certain percentage to liquid CaC in stove
2in add Al
2o
3, Fe
2o
3with a small amount of carbonaceous reducing agent, smelt Al-Ca-Fe alloy; CaC
2generating portion Raw mol ratio CaO:C=1:3.3-3.6, process is rich carbon operation, for improving the mobility of slag, with addition of the CaF of total quantity of slag 8%-15%
2, improve Performance of Slag.
2. the method for smelting Al-Ca-Fe alloy according to claim 1, is characterized in that carbonaceous reducing agent used can be coke, charcoal, bituminous coal and three's mixture, CaO mass content >=wt% in lime used.
3. the method for smelting Al-Ca-Fe alloy according to claim 1, is characterized in that liquid CaC
2, Al
2o
3, Fe
2o
3be respectively CaC with the ingredients by weight ratio of a small amount of carbonaceous reducing agent
230-40%, Fe
2o
320-35%, Al
2o
330-45%, carbonaceous reducing agent 3-5%.
4. the method for smelting Al-Ca-Fe alloy according to claim 1, is characterized in that the first step CaC
2the temperature of generating portion is controlled at more than 1600 ℃, product C aC
2mass content>=96%, the generation temperature of second step Al-Ca-Fe alloy is controlled at 1800-1900 ℃.
5. the method for smelting Al-Ca-Fe alloy according to claim 1, in the Al-Ca-Fe alloy that it is characterized in that smelting, the mass percent of each element is: calcium 35-40%, aluminium 20-25%, all the other are iron.
6. the method for smelting Al-Ca-Fe alloy according to claim 1, the reduction that it is characterized in that ferro-aluminum is mainly Al
2o
3, Fe
2o
3with liquid CaC
2in mineral hot furnace, interaction produces.
。
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013103654239A CN103451429A (en) | 2013-08-21 | 2013-08-21 | Method for smelting aluminum-calcium-iron alloy |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013103654239A CN103451429A (en) | 2013-08-21 | 2013-08-21 | Method for smelting aluminum-calcium-iron alloy |
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|---|---|
| CN103451429A true CN103451429A (en) | 2013-12-18 |
Family
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103706958A (en) * | 2013-12-26 | 2014-04-09 | 中国铝业股份有限公司 | Aluminum steel interface reductant |
| CN112029959A (en) * | 2020-07-31 | 2020-12-04 | 唐山飞迪冶金材料有限公司 | Aluminium carbide and its production method and use |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53134718A (en) * | 1977-04-28 | 1978-11-24 | Denki Kagaku Kogyo Kk | Low-melting calcium carbide |
| CN101260455A (en) * | 2008-04-28 | 2008-09-10 | 谢廷声 | Preparation of calcium-iron alloy by using calcium carbide as raw material and calcium-containing composite desoxidant |
| CN101260454A (en) * | 2008-04-23 | 2008-09-10 | 谢廷声 | Preparation of calcium-iron alloy for smelting steel by using calcium carbide as raw material and calcium-containing composite desoxidant |
| CN102827997A (en) * | 2011-06-13 | 2012-12-19 | 谢应旭 | Calcium carbide ferro-aluminium alloy used for smelting steel, and preparation method thereof |
-
2013
- 2013-08-21 CN CN2013103654239A patent/CN103451429A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53134718A (en) * | 1977-04-28 | 1978-11-24 | Denki Kagaku Kogyo Kk | Low-melting calcium carbide |
| CN101260454A (en) * | 2008-04-23 | 2008-09-10 | 谢廷声 | Preparation of calcium-iron alloy for smelting steel by using calcium carbide as raw material and calcium-containing composite desoxidant |
| CN101260455A (en) * | 2008-04-28 | 2008-09-10 | 谢廷声 | Preparation of calcium-iron alloy by using calcium carbide as raw material and calcium-containing composite desoxidant |
| CN102827997A (en) * | 2011-06-13 | 2012-12-19 | 谢应旭 | Calcium carbide ferro-aluminium alloy used for smelting steel, and preparation method thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103706958A (en) * | 2013-12-26 | 2014-04-09 | 中国铝业股份有限公司 | Aluminum steel interface reductant |
| CN103706958B (en) * | 2013-12-26 | 2016-05-25 | 中国铝业股份有限公司 | The agent of aluminum steel Interface Reduction |
| CN112029959A (en) * | 2020-07-31 | 2020-12-04 | 唐山飞迪冶金材料有限公司 | Aluminium carbide and its production method and use |
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Application publication date: 20131218 |