CN101724733A - Synthesized slag suitable for slag-metal applied electric field pollution-free deoxygenation and preparation method thereof - Google Patents
Synthesized slag suitable for slag-metal applied electric field pollution-free deoxygenation and preparation method thereof Download PDFInfo
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- CN101724733A CN101724733A CN200910200527A CN200910200527A CN101724733A CN 101724733 A CN101724733 A CN 101724733A CN 200910200527 A CN200910200527 A CN 200910200527A CN 200910200527 A CN200910200527 A CN 200910200527A CN 101724733 A CN101724733 A CN 101724733A
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Abstract
The invention relates to synthesized slag which is suitable for slag-metal applied electric field pollution-free deoxygenation and a preparation method thereof, belonging to the technical field of ferrous metallurgy refining processes. The synthesized slag comprises the following chemical components in percentage by weight: 40-50 percent of CaO, 25-45 percent of Al2O3, 1 to 8 percent of MgO, 5-15 percent of SiO2, 0.01 to 1 percent FeO and 0 to 2 percent of MnO; and the basicity ratio of the synthesized slag, namely (CaO+MgO)/(SiO2+Al2O3) is 0.8 to 1.2. The preparation method adopts a premelting-mixing process which comprises the following steps of: evenly mixing CaO powder, MgO powder, SiO2 powder and Al2O3 powder and then premelting, and air-cooling to the room temperature to obtain a melting cake; crushing the melting cake, grinding, screening and drying, and then evenly mixing with FeO powder and MnO powder. The synthesized slag has the advantages of low melting point, high melting speed, good fluidity, less volatiles, high ionic conductivity, and the like; in addition, no dust and pollution occur in the using process; and as the components of the premelting slag are much closer to components of the traditional refining slag, the preparation method has less changes to the prior art, thereby having low cost.
Description
Technical field
The present invention relates to a kind of synthetic slag and preparation method who is applicable to the slag metal applied electric field pollution-free deoxygenation, belong to ferrous metallurgy refinery practice technical field.
Background technology
Along with the develop rapidly of science and technology, people are more and more higher to the requirement of the quality of steel.As everyone knows, the deoxidation products of smelting process is the primary pollution source in the molten steel, so steel liquid deoxidation is a very important problem in the steelmaking process.Traditional method of deoxidation can't satisfy people's requirement more and more higher to the metallic substance cleanliness factor, and some metallargists have attempted some electrochemical deoxidising methods and carried out the deoxidation of molten metal.Wherein main method concentrates on utilizes zirconia solid electrolyte, by electrolytic process, galvanic cell method and deoxidant body method etc. with oxonium ion directional guide in addition, make with solid electrolyte in reductor such as hydrogen, carbon monoxide or active metal reaction, the correlated response product as: water, carbonic acid gas or oxide compound and metal melt do not come in contact, thereby reach deoxidation and the purpose of pollution metal liquid not.Although utilize solid electrolyte for the method for deoxidation of transmission medium has advantages such as pollution-free, that deoxidation speed is fast, also exist equipment complexity, cost higher, be difficult for problem such as popularization at the scene.
Under such background, problem at existing technology existence, on the basis of solid electrolyte pollution-free deoxidizing, a kind of new pollution-free deoxidizing method has been proposed: applying direct current electric field deoxidation method between the slag gold, promptly replace solid electrolyte with slag, between the slag gold, apply electric field and strengthen deoxidation, by conduction orientation and the speed of control oxonium ion in the slag system, thereby realize the pollution-free deoxidizing of molten metal, these these methods have that equipment is simple, cost is low, can work continuously, need not advantage such as reductive agent.
The outfield deoxy technology is a kind of new deoxidation thinking that is based upon on other method of deoxidation deficiencies between the slag gold, and purpose is in order to reduce the oxygen level in the cast steel, belong to the later stage refining of steel on technology.Its metallurgy action has some similarity with ladle refining furnace (LF) refining to a certain extent.Ladle refining furnace (LF) refining slag generally all has the diffusive deoxidation ability.The adding of MnO and FeO can significantly change Slag Properties, and a spot of MnO and FeO exist, and just can significantly improve Slag Properties.Under certain condition, exist in the slag electronics and (or) electron hole, and become the speed limit link of reacting between metal and slag.All help electronics in the slag and (or) hole is in the measure of metal with the transmission of slag interface, all will improve metal and slag speed of reaction and extent of reaction mutually greatly, in the slag metal applied electric field pollution-free deoxygenation process, the adding of MnO and FeO, for improving deoxidation speed aspect obvious effects is arranged, but a large amount of MnO and the existence of FeO will cause the remarkable increase of electronic conductance in the slag, thereby reduction current efficiency reduces production efficiency.Provide a kind of synthetic slag that is applicable to the slag metal applied electric field pollution-free deoxygenation at publication number for the Chinese patent of CN101435009: CaO 40-55%, Al
2O
340-55%, MgO 1～10%, and FeO 0.01～1%, and MnO 0～1%; Silicon is inevitable element in the steel-making actual procedure, and also inevitably there is SiO in slag
2, SiO
2Performances such as viscosity to slag have significant effects.
Summary of the invention
The purpose of this invention is to provide a kind of synthetic slag and preparation method who is applicable to the slag metal applied electric field pollution-free deoxygenation.
The embodiment of the inventive method is as described below:
A kind of synthetic slag that is applicable to the slag metal applied electric field pollution-free deoxygenation, it is characterized in that the chemical constitution of this synthetic slag and weight percentage thereof are: CaO 40～50%, Al
2O
325～45%, MgO 1～8%, SiO
25～15%, FeO 0.01～1%, and MnO 0～2%; And the basicity of synthetic slag i.e. (CaO+MgO)/(SiO
2+ Al
2O
3) ratio be 0.8～1.2.
A kind of preparation method who is applicable to the synthetic slag of slag metal applied electric field pollution-free deoxygenation is characterized in that having following process and step:
The chemical composition of a, design slag: the chemical constitution of slag and weight percent dispensing thereof are: CaO 40～50%, Al
2O
325～45%, MgO 1～8%, SiO
25～15%, FeO 0.01～1%, and MnO 0～2%; The basicity of synthetic slag i.e. (CaO+MgO)/(SiO
2+ Al
2O
3) ratio be 0.8～1.2;
B, employing fritting-hybrid technique: take by weighing a certain amount of CaO, MgO, SiO by above-mentioned prescription earlier
2And Al
2O
3Powder, evenly mixed, be positioned in the electric induction furnace, be heated to 1500～1650 ℃, make its fusing, this is the fritting process;
C, with above-mentioned melt air cooling to room temperature, obtain frit; Then this frit is carried out fragmentation, grind, sieve, after the drying, a certain amount of FeO and MnO powder are mixed mutually with the fritting frit powder of gained, and make and mix; The encapsulation of dry back is standby; In use this mixture forms synthetic slag.
A spot of SiO
2Adding, can reduce the surface tension of slag, and fusing point and viscosity changes very for a short time, as being 45% time, add SiO at CaO content
2Content is 10.44% o'clock, and surface tension has reduced by 17.92%, and yield temperature has reduced by 1.39%, and viscosity has on average increased by 12.39% (seeing Fig. 1,2,3).Improve the reaction of oxygen, help the carrying out of deoxidation process at slag gold interface, but excessive SiO
2, will increase the viscosity and the fusing point of slag, worsen slag gold boundary condition, be unfavorable for the carrying out of deoxidation.
Add a certain amount of SiO
2After, synthetic slag is more near ferrous metallurgy actual production technology slag, make synthetic slag adapt to actual production more, help reducing improvement cost, be necessary to provide a kind of new synthetic slag that is applicable to the slag metal applied electric field pollution-free deoxygenation, cause at slag under last one smelting procedure takes place in the steelmaking process especially to have SiO in the slag
2The situation of content.
Characteristics of the present invention are as described below:
The composition of pre-melted slag of the present invention is all in the low melting point district, it is low to have fusing point, and burn-off rate is fast, good fluidity, the oxygen ionic conductivity height, volatilization is few, is difficult for electrolysis under the high temperature, and surface tension is little, viscosity is suitable, the characteristics of good stability, no dust pollution in the use has good energy-conservation and environment protecting.Pre-melted slag component and existing refining slag composition are more approaching in addition, and little to existing technological transformation, cost is low, can satisfy the requirement of scale operation.
Description of drawings
Fig. 1 is 45% o'clock for CaO content, under 1550 ℃, and SiO
2Content is to the capillary influence of slag
Fig. 2 is 45% o'clock for CaO content, SiO
2Content is to the influence of slag fusing point
Fig. 3 is 45% o'clock for CaO content, under the differing temps, and SiO
2Content is to the influence of viscosity coefficient of dross
Embodiment
After now specific embodiments of the invention being described in.
Embodiment 1
The chemical constitution and the weight percent thereof of the slag of setting in the present embodiment are as follows: CaO 44.25%, Al
2O
338.92%, MgO 6.20%, SiO
29.84%, FeO 0.06%, and MnO 0.01%; (CaO+MgO)/(SiO wherein
2+ Al
2O
3)=1.04.
The process of the synthetic slag of preparation 2.5kg is as follows: will be by the CaO of above-mentioned weight percent, MgO, SiO
2And Al
2O
3After powder mixes, be positioned in the electric induction furnace, be heated to 1600 ℃, make its fusing, this is the fritting process, then with above-mentioned melt air cooling to room temperature, obtain frit; This frit is carried out fragmentation, grind, sieve, after the drying, will mix mutually with the fritting frit powder of gained, and make and mix by the FeO and the MnO powder of above-mentioned weight percent; The encapsulation of dry back is standby.
The application test of synthetic slag is as described below:
The synthetic slag 0.120kg of present embodiment gained is invested in the IF molten steel of 0.937kg, and heats in high temperature process furnances, Heating temperature is 1550 ℃; Between synthetic slag and molten steel, apply the DC electric field of 2V, experience after 10 minutes, detect the total oxygen content of finding in the molten steel and drop to 48ppm by 76ppm.
Claims (2)
1. synthetic slag that is applicable to the slag metal applied electric field pollution-free deoxygenation, it is characterized in that the chemical constitution of this synthetic slag and weight percentage thereof are: CaO 40～50%, Al
2O
325～45%, MgO 1～8%, SiO
25～15%, FeO 0.01～1%, and MnO 0～2%; And the basicity of synthetic slag i.e. (CaO+MgO)/(SiO
2+ Al
2O
3) ratio be 0.8～1.2.
2. preparation method who is applicable to the synthetic slag of slag metal applied electric field pollution-free deoxygenation is characterized in that this method has following technological process and step:
A. chemical constitution and the weight percentage thereof by synthetic slag is: CaO 40～50%, Al
2O
325～45%, MgO 1～8%, SiO
25～15%, FeO 0.01～1%, and MnO 0～2%; And the basicity of synthetic slag i.e. (CaO+MgO)/(SiO
2+ Al
2O
3) ratio be 0.8～1.2 to be equipped with powder;
B. with CaO, MgO, SiO
2And Al
2O
3Powder is evenly mixed, places electric induction furnace, is heated to 1500～1650 ℃, carries out fritting, and air cooling to room temperature obtains frit;
C. the frit that step b is obtained carries out fragmentation, grinds, sieves, after the drying, mixes with FeO and MnO powder; The encapsulation of dry back is standby; In use this mixture forms synthetic slag.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910200527A CN101724733A (en) | 2009-12-22 | 2009-12-22 | Synthesized slag suitable for slag-metal applied electric field pollution-free deoxygenation and preparation method thereof |
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|---|---|---|---|
| CN200910200527A CN101724733A (en) | 2009-12-22 | 2009-12-22 | Synthesized slag suitable for slag-metal applied electric field pollution-free deoxygenation and preparation method thereof |
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Family
ID=42446277
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102010931A (en) * | 2010-10-13 | 2011-04-13 | 山西太钢不锈钢股份有限公司 | Slagging method for reducing inclusions in boiler refractory steel |
| CN102321784A (en) * | 2011-08-22 | 2012-01-18 | 辽宁天和科技股份有限公司 | Pre-molten conductive slag for electrochemical deoxidation and preparation method thereof |
| CN102399937A (en) * | 2010-09-07 | 2012-04-04 | 鞍钢股份有限公司 | Molten steel electrochemical desulphurization method and apparatus |
| CN102399939A (en) * | 2010-09-07 | 2012-04-04 | 鞍钢股份有限公司 | Premelted slag for unpolluted deoxidization with externally applied voltage between metal and slag and preparation method thereof |
| CN102719617A (en) * | 2011-03-29 | 2012-10-10 | 鞍钢股份有限公司 | Electrochemical decarburization method for iron-carbon melts and apparatus thereof |
-
2009
- 2009-12-22 CN CN200910200527A patent/CN101724733A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102399937A (en) * | 2010-09-07 | 2012-04-04 | 鞍钢股份有限公司 | Molten steel electrochemical desulphurization method and apparatus |
| CN102399939A (en) * | 2010-09-07 | 2012-04-04 | 鞍钢股份有限公司 | Premelted slag for unpolluted deoxidization with externally applied voltage between metal and slag and preparation method thereof |
| CN102399939B (en) * | 2010-09-07 | 2014-03-12 | 鞍钢股份有限公司 | Premelted slag for unpolluted deoxidization with externally applied voltage between metal and slag and preparation method thereof |
| CN102010931A (en) * | 2010-10-13 | 2011-04-13 | 山西太钢不锈钢股份有限公司 | Slagging method for reducing inclusions in boiler refractory steel |
| CN102010931B (en) * | 2010-10-13 | 2012-09-05 | 山西太钢不锈钢股份有限公司 | Slagging method for reducing inclusions in boiler refractory steel |
| CN102719617A (en) * | 2011-03-29 | 2012-10-10 | 鞍钢股份有限公司 | Electrochemical decarburization method for iron-carbon melts and apparatus thereof |
| CN102321784A (en) * | 2011-08-22 | 2012-01-18 | 辽宁天和科技股份有限公司 | Pre-molten conductive slag for electrochemical deoxidation and preparation method thereof |
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Open date: 20100609 |