Effect of Na_2CO_3 on reduction and melting separation of ludwigite/coal composite pellet and property of boron-rich slag  

Na_2CO_3对硼铁矿含碳球团还原熔分行为及富硼渣性能的影响（英文）

作　　者：王广[1] 薛庆国[1] 王静松[1] 

机构地区：[1]北京科技大学钢铁冶金新技术国家重点实验室,北京100083

出　　处：《Transactions of Nonferrous Metals Society of China》2016年第1期282-293,共12页中国有色金属学报（英文版）

基　　金：Project(51274033) supported by the National Natural Science Foundation of China

摘　　要：The effects of Na_2CO_3 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. Na_2CO_3 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 Na_2CO_3 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 Na_2CO_3 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. Na_2CO_3 had obviously negative effect on melting separation of the composite pellet and boron extraction of the boron-rich slag.在实验室条件下研究了Na_2CO_3对硼铁矿含碳球团还原熔分行为、脱硫率以及熔分富硼渣性能的影响。Na_2CO_3在一定程度上可以提高硼铁矿含碳球团的还原速率。随着Na_2CO_3配比的增加,含碳球团的熔分效果逐渐变差,主要原因在于Na_2CO_3会显著提高富硼渣的熔点,导致球团难以熔分。当球团中Na_2CO_3的质量分数从0增加至6%时,珠铁中的硫含量(质量分数)逐渐从0.27%降低至0.084%。与此同时,缓冷富硼渣的萃取率从86.46%降低至59.52%。实验结果表明,Na_2CO_3的加入会对硼铁矿含碳球团的熔分效果和富硼渣中硼的提取产生不利影响。

关 键 词：LUDWIGITE carbon composite pellet reduction and melting separation DESULFURIZATION boron-rich slag boron extraction 

分 类 号：TF046.6[冶金工程—冶金物理化学]