CN85107824A - With the borax slag is the pouring in steel smelting covering slag of principal constituent - Google Patents

With the borax slag is the pouring in steel smelting covering slag of principal constituent Download PDF

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Publication number
CN85107824A
CN85107824A CN85107824.9A CN85107824A CN85107824A CN 85107824 A CN85107824 A CN 85107824A CN 85107824 A CN85107824 A CN 85107824A CN 85107824 A CN85107824 A CN 85107824A
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CN
China
Prior art keywords
slag
pouring
steel smelting
steel
covering slag
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Withdrawn
Application number
CN85107824.9A
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Chinese (zh)
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CN1010193B (en
Inventor
李广田
郭东章
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Northeastern University China
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Northeastern University China
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Filing date
Publication date
Application filed by Northeastern University China filed Critical Northeastern University China
Priority to CN 85107824 priority Critical patent/CN1010193B/en
Publication of CN85107824A publication Critical patent/CN85107824A/en
Publication of CN1010193B publication Critical patent/CN1010193B/en
Expired legal-status Critical Current

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  • Treatment Of Steel In Its Molten State (AREA)

Abstract

The present invention is a kind of new protection slag system that the pouring in steel smelting production process is used.This protection slag system is to have SiO concurrently with MgO33～38% that contains that the borax production process produces 2Na 2O B 2O 3Deng alkaline scrap material is main raw material, and with addition of the two or more additives such as power plant's ash, blast furnace granulated slag or carbon element below 50%, forms the pouring in steel smelting covering slag of MgO content between 15～28%.
This covering slag is except that the advantage that possesses domestic and international covering slag, and it is poor also to have water-absorbent, and the dross inclusion adsorption ability is strong, and the steel ingot of cast is sticking to mould not, advantages such as not carburetting.

Description

With the borax slag is the pouring in steel smelting covering slag of principal constituent
The present invention is the protection slag system that a kind of pouring in steel smelting production process is used.
In the pouring in steel smelting production process,, prevent the molten steel oxidation and molten steel is had the adiabatic heat-insulation effect with the topped molten steel of covering slag surface; Covering slag can adsorb the Al in the molten steel uphill process 2O 3Deng non-metallic inclusion; Between ingot mold and solidification of molten steel shell, form the uniform slag film and serve as lubricant.
Existing pouring in steel smelting is to use graphite tailing with covering slag mostly, perlite, power plant's ash and wollastonite etc. add solubility promoters such as a certain amount of soda ash, solid water glass, aluminium powder or silicon calcium powder for main raw material and heat-generating agent formulated.The chemical constitution of slag system is to rely on CaO-SiO-Al mostly 2O 3Phasor is adjusted the composition of positive slag, and the solubility promoter of adding and heat-generating agent are in order to physical and chemical performances such as the fusing point of adjusting slag, molten speed, viscosity.Though this slag system has satisfied the covering slag that pouring in steel smelting is used substantially, part still has some deficits.Show that mainly this slag system carbon content can make steel ingot, the center carburetting of steel cap oral area when higher, carbon content is crossed the low steel ingot sticking to mould after cast that makes again.For this reason, the protection slag system of selecting new pouring in steel smelting to use then is a research topic new in the metallurgical industry.
The present invention is based on having selected new protection slag system, i.e. MgO-CaO-SiO in the analysis of original protection slag system and the utilization of resources 2Slag system.
The present invention has SiO concurrently with the MgO 33～38% that contains that the borax production process produces 2Na 2O and B 2O 3Deng alkaline scrap material is main raw material, and as required with addition of the power plant's ash below 50%, two or more additives such as blast furnace granulated slag or carbon element form the pouring in steel smelting covering slag of MgO content between 15～28%.
It is composed as follows:
MgO CaO SiO 2Na 2O B 2O 3
15～28% 6～18% 20～38% 2～4% 1～3%
Al 2O 3C other
4-12% 4-16% 1-10%
Be used for the pouring in steel smelting embodiment with the covering slag of this slag system preparation:
Covering slag composition %:
MgO CaO SiO 2Al 2O 3Na 2O B 2O 3C other
22 16 37 84 2.5 5 is residual
Add at steel per ton under the situation of 25kg in order to the cast straight carbon steel, surface of steel ingot first class product rate reaches 90% and absorbs Al 2O 3Inclusion increment 200%.Steel ingot is sticking to mould not, not carburetting of ingot head.
The present invention adopts MgO-CaO-SiO 2New slag system makes the Al in the slag 2O 3Content is low, the basicity height of slag, absorption molten steel come-up Al 2O 3The inclusion ability is strong; This new slag system utilizes MgCO 3The CO that decomposes produces 2Gas is adjusted the molten speed of slag, and the spreadability of improving slag makes new slag system have good melting characteristic, thereby makes the ingot quality of cast that improvement significantly be arranged.
Starting material of the present invention are industrial residue mostly; no longer in slag, add the high materials of price such as soda ash and solid water glass; make the cost of raw and processed materials of covering slag that decline significantly be arranged, thereby reduced steel-making cost, the natural water-intake rate of slag in storage and transportation reduced.

Claims (1)

  1. The protection slag system that a kind of pouring in steel smelting is used is characterized in that it is based on borax slag that raw material is formed, its chemical constitution:
    MgO CaO SiO 2Na 2O B 2O 3Al 2O 3C
    15～28% 6～18% 20～38% 2～4% 1～3% 4～12% 4～16%
    Other
    1～10%。
CN 85107824 1985-10-17 1985-10-17 Protecting dregs made of residue of boron as the main component for steel smelt-pouring Expired CN1010193B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 85107824 CN1010193B (en) 1985-10-17 1985-10-17 Protecting dregs made of residue of boron as the main component for steel smelt-pouring

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 85107824 CN1010193B (en) 1985-10-17 1985-10-17 Protecting dregs made of residue of boron as the main component for steel smelt-pouring

Publications (2)

Publication Number Publication Date
CN85107824A true CN85107824A (en) 1987-04-22
CN1010193B CN1010193B (en) 1990-10-31

Family

ID=4795797

Family Applications (1)

Application Number Title Priority Date Filing Date
CN 85107824 Expired CN1010193B (en) 1985-10-17 1985-10-17 Protecting dregs made of residue of boron as the main component for steel smelt-pouring

Country Status (1)

Country Link
CN (1) CN1010193B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1318165C (en) * 2004-02-27 2007-05-30 宝山钢铁股份有限公司 Coverage dregs for ladle
CN102059330A (en) * 2011-02-15 2011-05-18 江苏大学 Boron-containing fluoride-free covering slag for steel continuous-casting crystallizer and preparation method thereof

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1318165C (en) * 2004-02-27 2007-05-30 宝山钢铁股份有限公司 Coverage dregs for ladle
CN102059330A (en) * 2011-02-15 2011-05-18 江苏大学 Boron-containing fluoride-free covering slag for steel continuous-casting crystallizer and preparation method thereof
CN102059330B (en) * 2011-02-15 2013-01-23 江苏大学 Boron-containing fluoride-free covering slag for steel continuous-casting crystallizer and preparation method thereof

Also Published As

Publication number Publication date
CN1010193B (en) 1990-10-31

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