Characteristics and Mechanism of Reduction and Smelting-separation Process of Copper Slag

Jun ZHANG,Yuan-hong QI,Ding-liu YAN,Xiang-li CHENG,Peng HE

钢铁研究学报(英文版) ›› 2015, Vol. 22 ›› Issue (2) : 121-127.

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钢铁研究学报(英文版) ›› 2015, Vol. 22 ›› Issue (2) : 121-127.
Metallurgy and Metal Working

Characteristics and Mechanism of Reduction and Smelting-separation Process of Copper Slag

  • Jun ZHANG,Yuan-hong QI,Ding-liu YAN,Xiang-li CHENG,Peng HE
作者信息 +

Characteristics and Mechanism of Reduction and Smelting-separation Process of Copper Slag

  • Jun ZHANG,Yuan-hong QI,Ding-liu YAN,Xiang-li CHENG,Peng HE
Author information +
文章历史 +

摘要

The characteristics and mechanism of the reduction and smelting-separation process of the copper slag were studied by investigating the variation rule of metallization ratio, yield as well as carbon content of iron nuggets. The formation of molten slag is necessary for slag-iron separation, and iron is in half-molten state during smelting-separation process, the carbon content of which is about 1. 25%. Carburization occurs through direct contact between carbon and iron in essence, no matter in solid or molten state. The carburization rate is slow below 1200 ℃, which is inhibited by the existence of slag. Residual FeO in molten slag tends to form fayalite with SiO2 in the copper slag, which is the root cause for the low melting temperature of copper slag. The addition of CaO improves the reducibility of the copper slag, but Al2O3 addition has no obvious effect. The melting temperature of slag affects the carburization extent in solid state, while the content of FeO in molten slag affects that in molten state, both of which co-determine the carbon content in iron nuggets.

Abstract

The characteristics and mechanism of the reduction and smelting-separation process of the copper slag were studied by investigating the variation rule of metallization ratio, yield as well as carbon content of iron nuggets. The formation of molten slag is necessary for slag-iron separation, and iron is in half-molten state during smelting-separation process, the carbon content of which is about 1. 25%. Carburization occurs through direct contact between carbon and iron in essence, no matter in solid or molten state. The carburization rate is slow below 1200 ℃, which is inhibited by the existence of slag. Residual FeO in molten slag tends to form fayalite with SiO2 in the copper slag, which is the root cause for the low melting temperature of copper slag. The addition of CaO improves the reducibility of the copper slag, but Al2O3 addition has no obvious effect. The melting temperature of slag affects the carburization extent in solid state, while the content of FeO in molten slag affects that in molten state, both of which co-determine the carbon content in iron nuggets.

关键词

copper slag / reduction and smelting-separation / carburization / iron nuggets

Key words

copper slag / reduction and smelting-separation / carburization / iron nuggets

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导出引用
张俊. Characteristics and Mechanism of Reduction and Smelting-separation Process of Copper Slag[J]. 钢铁研究学报(英文版), 2015, 22(2): 121-127
ZHANG Jun. Characteristics and Mechanism of Reduction and Smelting-separation Process of Copper Slag[J]. Journal of Iron and Steel Research International, 2015, 22(2): 121-127

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基金

National Key Basic Research and Development Program of China

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