转炉热熔渣中底吹喷粉行为研究

采用数值模拟方法,针对转炉溅渣护炉前向熔渣底吹喷粉过程,研究了粉气比、粒径以及底吹流量对粉剂分布的影响规律。模拟结果表明,熔池中颗粒具有随动特性,基本分布于熔池流场环流区域;粉气比从55 kg/m^3提高到75 kg/m^3,可小幅度提高颗粒在环流区域内的分布范围。颗粒的粒度过大会抑制流场的湍动强度,颗粒1 mm时,影响近渣面层颗粒的均匀分布。底吹流量增加,熔池中横向流增加,环流流速增加,死区变小有利于颗粒均匀分布。

Electrochemical behaviors of lomefloxacin at a single-wall carbon nanotube-modified electrode and its interaction with bovine serum albumin

The electrochemical behaviors of lomefloxacin at a single-wall carbon nanotube-modified glassy carbon electrode have been investigated by cyclic voltammetry.In a Britton-Robinson buffer (pH 4.5),lomefloxacin yields a sensitive and well-defined oxidation peak at ca.1.24 V (vs.SCE) on the modified electrode.Compared with the bare glassy carbon electrode,the oxidation peak current of lomefloxacin significantly increases and the oxidation peak potential positively shifts.Under the optimal conditions,the interaction of lomefloxacin with bovine serum albumin is also investigated.The results indicate that an electrochemically inactive supramolecular complex is formed and the formation of complex between lomefloxacin and bovine serum albumin is an intercalation mechanism.The proposed methods offer a reference for the studies on the biological effects and action mechanism of lomefloxacin with albumins in vivo.

含硼低熔化温度非晶母合金精炼渣系分析及试验研究

针对熔点为1250℃的非晶母合金,在CaO-SiO_(2)-Al_(2)O_(3)基础渣系中添加B_(2)O_(3),设计了含硼低熔化温度渣系;采用FactSage7.2软件模拟计算,研究了CaO-SiO_(2)-Al_(2)O_(3)-B_(2)O_(3)四元精炼渣系相图,B_(2)O_(3)比例从7%增加到19%时,相图中的低熔化温度区面积比由5%增大至46%;B_(2)O_(3)含量控制在13%~16%时,熔化温度为1100~1200℃,适宜非晶母合金的冶炼;采用熔化温度测定仪开展了热态试验,试验熔化温度在1150±25℃,与模拟结果符合。