CN1264745A - Final slag modifier for smelting steel in converter - Google Patents
Final slag modifier for smelting steel in converter Download PDFInfo
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- CN1264745A CN1264745A CN 00112705 CN00112705A CN1264745A CN 1264745 A CN1264745 A CN 1264745A CN 00112705 CN00112705 CN 00112705 CN 00112705 A CN00112705 A CN 00112705A CN 1264745 A CN1264745 A CN 1264745A
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- slag
- smelting
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Abstract
A final slag modifier for smelting steel in converter contains MgO (45-55 wt.%), CaO (4-9 wt.%), C (3-10 wt.%) and SiO2 (3-10 wt.%), as well as additive. It serves to convert the low-smelting-point slag whose main phase is ferrite to the higher-smelting-point slag whose main phase is dicalcium silicate or tricalcium silicate,so increasing the smelting point and viscosit of final slag.
Description
The invention belongs to the field of smelting of steel, particularly a kind ofly be used to improve the steel-making furnace lining final slag modifier in work-ing life.
Splashing slag in converter usually is used to improve the work-ing life of converter; its method is to stay slag (being called finishing slag in the metallurgy industry) behind converter tapping; it is blown to splash form protective layer on the furnace wall, resist once more to reach that slag prolongs the work-ing life of furnace lining to the erosion of furnace lining in the smelting process.Usually the method that adopts is to add corresponding regulator in finishing slag, improves the MgO content in the finishing slag, reduces FeO content, to improve the fusing point and the viscosity of finishing slag, obtains and spatters the slag effect preferably.Chinese patent 97109079.3 discloses a kind of steel-making converter finishing slag modifying material and producing and manufacturing technique thereof, though can improve the fusing point and the viscosity of steel-making finishing slag, but it is better that its modifying material is used for calcareous slag system effect, and when being used for the irony slag system, because irony slag system molten steel consumption is low, finishing slag all iron content height, fusing point is low, be difficult for sticking on the furnace wall or adhesiving effect poor, the erosion that can not resist once more the high temperature slag of smelting, the effect that slag is spattered in influence.
The purpose of this invention is to provide a kind of final slag modifier for smelting steel in converter.It can make wustite is that the low melting point slag of main ore deposit phase changes into Dicalcium Phosphate (Feed Grade) and tricalcium silicate to be the slag of main ore deposit higher melt mutually, can to improve the fusing point and the viscosity of irony slag system finishing slag, and easy to use.
For achieving the above object, of the present inventionly it is characterized in that the consisting of of modification agent (below be weight percentage): MgO 45-55%; CaO 4-9%; C 3-10%; SiO
23-10%, the weight percent sum of above-mentioned substance and additive and impurity is absolutely.
MgO can saturated finishing slag in the mentioned component of the present invention, improves the viscosity of finishing slag, and finishing slag is adhered on the furnace wall firmly; Reduction reaction takes place in the FeO in C and the finishing slag, reduces the wherein content of FeO, to reduce the content of wustite in the slag, is beneficial to and improves the temperature that sticks to finishing slag on the furnace lining, to resist once more the erosion of slag produced from steel-smelting to furnace lining; Can suitably improve the basicity of finishing slag after the CaO fusing, help forming Dicalcium Phosphate (Feed Grade) and tricalcium silicate, form dystectic thing phase, make it at high temperature absorb a large amount of FeO, reduce the content of FeO in the finishing slag and can improve the viscosity of finishing slag, finishing slag is sticked on the furnace lining preferably.
The present invention is described further below in conjunction with embodiment.
Embodiment
Get material in table 1 ratio, add the water allotment and be pressed into pelletizing, go into stove before finishing slag spatters slag, add additive, the finishing slag add-on is adjusted according to the content of FeO in finishing slag amount and the slag.
Each component concentration table of table 1 final slag modifier of the present invention (following is the weight meter)
| Sequence number | ??MgO％ | ??CaO％ | ??C％ | ??SiO 2％ |
| ????1. | ????45 | ????9 | ????10 | ????10 |
| ????2. | ????48 | ????6 | ????8 | ????8 |
| ????3. | ????50 | ????10 | ????10 | ????4 |
| ????4. | ????55 | ????4 | ????6 | ????3 |
The preferred light-magnesite powder of MgO of the present invention, the preferred ground dolomite of CaO, C can be coke powder, coal dust, Graphite Powder 99, SiO
2Preferred silicon powder.
Analytical results is carried out in the sampling of finishing slag before and after the finishing slag upgrading is:
| ??CaO | ??SiO 2 | ??MgO | ??FeO | ??P 2O 5 | ????R | Fusing point ℃ | |
| Before the upgrading | ??44.4 | ??11.04 | ??6.14 | ??23.58 | ????1.58 | ????3.33 | ????1372 |
| Behind the upgrading | ??47.28 | ??11.93 | ??9.68 | ??17.73 | ????1.6 | ????3.45 | ????1408 |
The upgrading effect:
1.FeO reduce by 5.58% (FeO is reduced to 3.97% in Chinese patent 97109079.3 disclosed a kind of steel-making converter finishing slag modifying material and the producing and manufacturing technique thereof).The reduction of FeO content makes the slag retrogradation, is easy to stick on the furnace lining;
2.MgO increase by 3.04% (MgO increases by 2.5% in Chinese patent 97109079.3 disclosed a kind of steel-making converter finishing slag modifying material and the producing and manufacturing technique thereof).The raising of MgO content makes the slag retrogradation equally, is easy to stick on the furnace lining;
3. the basicity of slag slightly improves, and helps forming Dicalcium Phosphate (Feed Grade) and tricalcium silicate, improves the fusing point of slag, reduces the superheating temperature of slag;
4. the fusing point of slag has improved 36 ℃, has improved the refractoriness and the anti-erosional competency of smelting high temperature furnace slag once more of slag.
Use the ore deposit of modification agent of the present invention front and back finishing slag to compare:
| Calucium Silicate powder | The RO phase | Wustite | Periclasite | |
| Before the upgrading | ??38-43 | ????8-10 | ????42-48 | ????3-4 |
| Behind the upgrading | ??52-56 | ??18-25 | ????15-24 | ????5-6 |
Modification agent of the present invention makes the weave construction Calucium Silicate powder of finishing slag improve 13～14%, and wustite has reduced by 24～28%, and periclasite improves 2%, and fusing point improves 36 ℃.Finishing slag carries out change in organization through modification agent of the present invention; helping forming high-melting-point Dicalcium Phosphate (Feed Grade), tricalcium silicate and periclasite is skeleton; with RO mutually and wustite be the slag blanket that spatters in conjunction with mutually; fusing point is 1405～1411 ℃; the refractoriness and the anti-erosional competency of smelting high temperature furnace slag once more of spattering slag blanket have been improved; can protect furnace lining, prolong life of converter, have and spatter the slag effect preferably.
Claims (1)
1. final slag modifier for smelting steel in converter is characterized in that the consisting of of modification agent (below be weight percentage): MgO 45-55%; CaO 4-9%; C 3-10%; SiO
23-10%; The weight percent sum of above-mentioned substance and additive and impurity is absolutely.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00112705 CN1264745A (en) | 2000-02-22 | 2000-02-22 | Final slag modifier for smelting steel in converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00112705 CN1264745A (en) | 2000-02-22 | 2000-02-22 | Final slag modifier for smelting steel in converter |
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| Publication Number | Publication Date |
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| CN1264745A true CN1264745A (en) | 2000-08-30 |
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| CN 00112705 Pending CN1264745A (en) | 2000-02-22 | 2000-02-22 | Final slag modifier for smelting steel in converter |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100340677C (en) * | 2004-11-30 | 2007-10-03 | 宝山钢铁股份有限公司 | Slag regulating agent for super high power large electric furnace smelting |
| CN100396799C (en) * | 2005-09-20 | 2008-06-25 | 孟宪民 | Synthetic adding ball and its preparing method |
| CN101603117B (en) * | 2008-06-12 | 2011-06-15 | 攀钢集团钢铁钒钛股份有限公司 | Slag modifier and preparation method and using method thereof |
| CN102586536A (en) * | 2012-03-27 | 2012-07-18 | 辽宁科技大学 | Converter steel-making final slag modifier utilizing magnesite tailings to serve as raw material and production method thereof |
| CN102719575A (en) * | 2011-03-29 | 2012-10-10 | 鞍钢股份有限公司 | Converter steel slag modifier and manufacturing and using methods thereof |
| CN102912070A (en) * | 2012-10-31 | 2013-02-06 | 攀钢集团研究院有限公司 | Slag splashing furnace protection method for vanadium extraction converter |
| CN102912072A (en) * | 2012-10-31 | 2013-02-06 | 攀钢集团研究院有限公司 | Low-cost slag regulating agent for vanadium-extracting converter splash protection |
| CN102943143A (en) * | 2012-12-12 | 2013-02-27 | 沈阳东北大学冶金技术研究所有限公司 | Slag stopping material, slag stopping method and combined technology method of slag stopping and slag splashing protection |
| CN103952508A (en) * | 2014-04-29 | 2014-07-30 | 首钢京唐钢铁联合有限责任公司 | Operation method for adding modifier before tapping |
| CN103993122A (en) * | 2014-05-15 | 2014-08-20 | 攀钢集团攀枝花钢铁研究院有限公司 | Converter final slag modifier, preparation method thereof and converter steelmaking method |
| CN104131130A (en) * | 2014-07-17 | 2014-11-05 | 攀钢集团西昌钢钒有限公司 | Converter final-slag modifier and use thereof |
| CN105385803A (en) * | 2015-11-20 | 2016-03-09 | 武汉钢铁(集团)公司 | Converter final slag modifier and preparing method |
| CN110129512A (en) * | 2019-06-17 | 2019-08-16 | 河钢股份有限公司承德分公司 | A kind of final slag modifier and converter semi-steel making finishing slag method for modifying |
-
2000
- 2000-02-22 CN CN 00112705 patent/CN1264745A/en active Pending
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100340677C (en) * | 2004-11-30 | 2007-10-03 | 宝山钢铁股份有限公司 | Slag regulating agent for super high power large electric furnace smelting |
| CN100396799C (en) * | 2005-09-20 | 2008-06-25 | 孟宪民 | Synthetic adding ball and its preparing method |
| CN101603117B (en) * | 2008-06-12 | 2011-06-15 | 攀钢集团钢铁钒钛股份有限公司 | Slag modifier and preparation method and using method thereof |
| CN102719575A (en) * | 2011-03-29 | 2012-10-10 | 鞍钢股份有限公司 | Converter steel slag modifier and manufacturing and using methods thereof |
| CN102586536A (en) * | 2012-03-27 | 2012-07-18 | 辽宁科技大学 | Converter steel-making final slag modifier utilizing magnesite tailings to serve as raw material and production method thereof |
| CN102912070B (en) * | 2012-10-31 | 2014-09-03 | 攀钢集团研究院有限公司 | Slag splashing furnace protection method for vanadium extraction converter |
| CN102912070A (en) * | 2012-10-31 | 2013-02-06 | 攀钢集团研究院有限公司 | Slag splashing furnace protection method for vanadium extraction converter |
| CN102912072A (en) * | 2012-10-31 | 2013-02-06 | 攀钢集团研究院有限公司 | Low-cost slag regulating agent for vanadium-extracting converter splash protection |
| CN102912072B (en) * | 2012-10-31 | 2014-08-06 | 攀钢集团研究院有限公司 | Low-cost slag regulating agent for vanadium-extracting converter splash protection |
| CN102943143A (en) * | 2012-12-12 | 2013-02-27 | 沈阳东北大学冶金技术研究所有限公司 | Slag stopping material, slag stopping method and combined technology method of slag stopping and slag splashing protection |
| CN103952508A (en) * | 2014-04-29 | 2014-07-30 | 首钢京唐钢铁联合有限责任公司 | Operation method for adding modifier before tapping |
| CN103952508B (en) * | 2014-04-29 | 2016-07-27 | 首钢京唐钢铁联合有限责任公司 | Operation method for adding modifier before tapping |
| CN103993122A (en) * | 2014-05-15 | 2014-08-20 | 攀钢集团攀枝花钢铁研究院有限公司 | Converter final slag modifier, preparation method thereof and converter steelmaking method |
| CN103993122B (en) * | 2014-05-15 | 2015-11-18 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of converter final slag modifier and preparation method thereof and converter steel making method |
| CN104131130A (en) * | 2014-07-17 | 2014-11-05 | 攀钢集团西昌钢钒有限公司 | Converter final-slag modifier and use thereof |
| CN105385803A (en) * | 2015-11-20 | 2016-03-09 | 武汉钢铁(集团)公司 | Converter final slag modifier and preparing method |
| CN110129512A (en) * | 2019-06-17 | 2019-08-16 | 河钢股份有限公司承德分公司 | A kind of final slag modifier and converter semi-steel making finishing slag method for modifying |
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