Effect of Na₂CO₃ on reduction and melting separation of ludwigite/coal composite pellet and property of boron-rich slag

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• 作者：Guang WANG ; Qing-guo XUE ; Jing-song WANG ; ^{wangjingsong@ustb.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：ludwigite ; carbon composite pellet ; reduction and melting separation ; desulfurization ; boron-rich slag ; boron extraction
• 刊名：Transactions of Nonferrous Metals Society of China
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：26
• 期：1
• 页码：282-293
• 全文大小：4911 K

文摘

The effects of Na₂CO₃ on the reduction and melting separation behavior of ludwigite/coal composite pellet, the desulfurization ratio and the property of the separated boron-rich slag were investigated at laboratory scale in the present work. Na₂CO₃ could improve the reduction rate of the composite pellet to some extent. The melting separation of the composite pellet became increasingly difficult with the increase of Na₂CO₃ in the pellet due to the sharply increasing of the melting point of slag. The sulfur content of the iron nugget gradually decreased from 0.27% to 0.084% (mass fraction) with the Na₂CO₃ content in the pellet increasing from 0 to 6%. The efficiency of extraction of boron (EEB) of the slow cooled boron-rich slag decreased from 86.46% to 59.52% synchronously. Na₂CO₃ had obviously negative effect on melting separation of the composite pellet and boron extraction of the boron-rich slag.