US 2026/0185174 A1Published application

Design method for high-performance lf desulfurization refining slag

AssigneesNorth China University of Technology, University of Science and Technology Beijing, Beijing University of Technology

InventorsLifeng ZHANG, Jujin WANG, Haixin YANG, Jinshu WANG, Xiaofeng LIU, Ying REN, Wen YANG, Guangtuan BAO

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Abstract

A design method for high-performance ladle furnace (LF) desulfurization refining slag is provided, including: step S1: extracting a refining slag composition of LF desulfurization refining slag, and calculating a complete melting temperature and a viscosity of the refining slag composition; step S2: based on the refining slag composition and corresponding complete melting temperature and viscosity, calculating a desulfurization capacity of each refining slag composition, and determining a desulfurization range of the refining slag composition based on desulfurization capacity results; and step S3: selecting a high-performance LF desulfurization refining slag composition based on a desulfurization capacity range of the refining slag composition, analyzing a sulfur content in steel, and completing a design of the high-performance LF desulfurization refining slag. The disclosure uses FactSage thermodynamic software to calculate the complete melting temperature and viscosity range of the refining slag, and the theoretical desulfurization capacity of the refining slag.

A design method for high-performance ladle furnace (LF) desulfurization refining slag, wherein the design method comprises:

step S1:
extracting a refining slag composition of the LF desulfurization refining slag, and calculating a complete melting temperature and a viscosity of the refining slag composition;
step S2:
based on the refining slag composition and the complete melting temperature and the viscosity of the refining slag composition, calculating a desulfurization capacity of each of the refining slag composition, and determining a desulfurization range of the refining slag composition based on desulfurization capacity results;
and
step S3:
selecting a high-performance LF desulfurization refining slag composition based on a desulfurization capacity range of the refining slag composition, then analyzing a sulfur content in steel, and completing a design of the high-performance LF desulfurization refining slag;
wherein in the step S1, a process of extracting the refining slag composition of the LF desulfurization refining slag and calculating the complete melting temperature and the viscosity of the refining slag composition comprises:
in a calcium oxide (CaO)-aluminum oxide (Al2O3)-silicon dioxide (SiO2)-magnesium oxide (MgO)-based refining slag, a main body is a CaO—Al2O3—SiO2 ternary system;
and using a Phase Diagram module in FactSage 8.2 software to calculate a complete melting range and a viscosity of the refining slag at 1400-1600 degrees Celsius (° C.) with MgO contents of 4 percent (%), 6%, 8%, and 10%;
and
a process of calculating the viscosity of the refining slag composition is:
Viscosity
(
solid
+
liquid
)
=
Viscosity
(
liquid
)
·
(
1
-
solid
⁢
fraction
)
-
2.5
,
wherein Viscosity(solid+liquid) is a viscosity of a solid-liquid mixed slag, Viscosity(liquid) is a viscosity of a liquid part of the slag, and solid fraction is a viscosity of a solid part of the slag;
and
in the step S3, a process of selecting the high-performance LF desulfurization refining slag composition based on the desulfurization capacity range of the refining slag composition, and analyzing the sulfur content in the steel comprises:
preparing a refining slag based on a selected high-performance LF desulfurization refining slag composition and performing pretreatment;
using an X-ray fluorescence (XRF) device to detect a composition of a pretreated refining slag;
and
based on composition detection results, calculating a sulfur content in molten steel using a spark discharge analyzer.

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Abstract

Claims5