转炉钢渣碳热还原的热力学模拟分析

doi:10.13228/j.boyuan.issn1006-9356.20230540

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Abstract To study the changes in phase types and contents of equilibrium products during the carbothermal reduction of converter slag, based on the variables of reduction temperature, alkalinity, and carbon ratio (coke-to-slag ratio), FactSage 7.1 thermodynamic software was used for calculation and analysis. The study reveals under a certain coke-slag ratio, with the increase of reduction temperature, the residual C content in the equilibrium phase composition shows decreasing trend, while the Fe₃C and P₂ gas content show increasing trend, indicating that the high temperature is favorable to the reduction of iron oxides and apatite, especially to the gasification of dephosphorization. With reduction temperature increasing, the contents of Fe₃P/Fe₂P in the equilibrium phase composition decrease, while the contents of Mn₂P and P₂(g) increase. This indicates that the reduction temperature has significant influence on the stability sequence of phosphorus-containing phases, with the stability enhancement order as Fe₃P→Fe₂P→Mn₂P→P₂(g). High temperature favors the gasification and removal of phosphorus. Under constant coke-to-slag ratio and reduction temperature, the increase in the alkalinity of charge leads to elevation of Fe₃C content in the equilibrium phase composition, indicating that higher alkalinity promotes the reduction of iron oxides. As the alkalinity of the mixture increase, the silicate liquid phase content in the equilibrium phase composition shows decreasing trend, and the alkalinity of 1.8 generates the largest amount of liquid phase. The alkalinity of the mixture in the range of 1.8 to 2.2 is conducive to the generation of α-C₂S and self-pulverization of the product, and the content of α-C₂S is largest when the alkalinity is 2.0. Changes in the coke-to-slag ratio have minimal impact on the phase types and contents of equilibrium products during carbothermal reduction of converter slag. Thermodynamic calculations indicates that the temperature range favorable for steel slag pulverization is 1 450-1 500 ℃, the alkalinity range is 1.8-2.2, and the coke-slag ratio range is 10∶90-15∶85. This range of conditions facilitates the generation of α-C₂S and the best pulverization of steel slag.

Key words： converter steel slag carbothermal reduction thermodynamic calculation equilibrium product physical composition

Received: 08 September 2023

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	ZHANG Bokang
	LUO Guoping
	HAO Shuai
	CHAI Yifan

Cite this article:

ZHANG Bokang,LUO Guoping,HAO Shuai等. Thermodynamic simulation analysis for carbothermal reduction of converter steel slag[J]. China Metallurgy, 2024, 34(2): 42-51.

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http://www.zgyj.ac.cn/EN/10.13228/j.boyuan.issn1006-9356.20230540 OR http://www.zgyj.ac.cn/EN/Y2024/V34/I2/42

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