w(CaO)/w(Al2O3)对钙铝基保护渣结晶性能的影响

doi:10.12068/j.issn.1005-3026.2021.12.007

东北大学学报（自然科学版） ›› 2021, Vol. 42 ›› Issue (12): 1717-1723.DOI: 10.12068/j.issn.1005-3026.2021.12.007

w(CaO)/w(Al₂O₃)对钙铝基保护渣结晶性能的影响

亓捷^1,2，刘承军^1,2，张江浩^1,2，姜茂发^1,2

(1. 东北大学多金属共生矿生态化冶金教育部重点实验室，辽宁沈阳110819; 2. 东北大学冶金学院，辽宁沈阳110819)

修回日期:2021-05-06 接受日期:2021-05-06 发布日期:2021-12-17
通讯作者: 亓捷
作者简介:亓捷(1987－ )，男，山东莱芜人，东北大学讲师；刘承军(1974－ )，男，河南获嘉人，东北大学教授，博士生导师；姜茂发(1955－ )，男，山东栖霞人，东北大学教授，博士生导师.
基金资助:
国家自然科学基金资助项目(51904064，U1908224，51974075)；中国博士后科学基金资助项目(2020T130084，2019M661114)；中央高校基本科研业务费专项资金资助项目(N2125013).

Effect of w(CaO)/w(Al₂O₃) on the Crystallization Properties of CaO-Al₂O₃-based Mold Flux

QI Jie^1,2， LIU Cheng-jun^1,2， ZHANG Jiang-hao^1,2， JIANG Mao-fa^1,2

1. Key Laboratory for Ecological Metallurgy of Multimetallic Ores

Revised:2021-05-06 Accepted:2021-05-06 Published:2021-12-17
Contact: QI Jie
About author:-
Supported by:
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摘要/Abstract

摘要： 利用热丝法测试技术，结合扫描电镜和能谱分析，研究了不同w(CaO)/w(Al₂O₃)条件下钙铝基保护渣的结晶性能.结果表明，较低w(CaO)/w(Al₂O₃)下，保护渣结晶物相为LiAlO₂和CaO·Al₂O₃.其析出由渣中的Li⁺离子和Ca²⁺离子分别对高聚合度铝氧四面体结构的电荷补偿所致.而且，Li⁺离子优先参与，LiAlO₂优先析出.较高w(CaO)/w(Al₂O₃)下，结晶物相转变为LiAlO₂和3CaO·Al₂O₃.其变化原因为，CaO相对质量分数提高，保护渣聚合度降低，Ca²⁺离子和低聚合度铝氧四面体结构单元Q²结合而形成3CaO·Al₂O₃并析出.随着w(CaO)/w(Al₂O₃)由1.13提高至1.82，钙铝基保护渣析晶能力先减弱然后增强.在w(CaO)/w(Al₂O₃)为1.50和1.82时分别具有最弱和最强的析晶能力.

关键词: 钙铝基保护渣;结晶温度;结晶物相;熔体结构;热丝法

Abstract: The crystallization properties of CaO-Al₂O₃-based mold fluxes with different values of w(CaO)/w(Al₂O₃) were studied by using single hot thermocouple technique(SHTT) and scanning electron microscope and energy dispersive spectrometer(SEM-EDS). The results showed that the crystalline phases were LiAlO₂ and CaO·Al₂O₃ with a lower w(CaO)/w(Al₂O₃). They were formed due to the charge compensation of Li⁺ions and Ca²⁺ ions to aluminum tetrahedral structure with high polymerization degree. Li⁺ions were preferentially involved， and LiAlO₂ preferentially precipitated. With higher w(CaO)/w(Al₂O₃)， the crystalline phase was transformed into LiAlO₂ and 3CaO·Al₂O₃. The reason for the change was that the relative mass fraction of CaO was increased， accordingly， the degree of polymerization of the mold flux was decreased and 3CaO·Al₂O₃ was formed and precipitated due to the combination of Ca²⁺ ions and low-polymerization tetrahedral structural unit Q². As the w(CaO)/w(Al₂O₃) was increased from 1.13 to 1.82， the crystallization ability was first weakened and then increased. The crystallization ability was the weakest and the strongest when the w(CaO)/w(Al₂O₃) was 1.50 and 1.82， respectively.

Key words: CaO-Al₂O₃-based mold flux; crystallization temperature; crystalline phase; melt structure; SHTT(single hot thermocouple technique)

中图分类号:

亓捷，刘承军，张江浩，姜茂发. w(CaO)/w(Al₂O₃)对钙铝基保护渣结晶性能的影响[J]. 东北大学学报（自然科学版）, 2021, 42(12): 1717-1723.

QI Jie， LIU Cheng-jun， ZHANG Jiang-hao， JIANG Mao-fa. Effect of w(CaO)/w(Al₂O₃) on the Crystallization Properties of CaO-Al₂O₃-based Mold Flux[J]. Journal of Northeastern University(Natural Science), 2021, 42(12): 1717-1723.

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w(CaO)/w(Al₂O₃)对钙铝基保护渣结晶性能的影响

Effect of w(CaO)/w(Al₂O₃) on the Crystallization Properties of CaO-Al₂O₃-based Mold Flux

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