摘要
为探索硅类物质对铁水脱磷的影响,分别利用硅铁和SiO_(2)配制不同硅/SiO_(2)含量的铁水和脱磷剂,研究其对脱磷率的影响。同时,为了解渣-铁体系中不同硅类物质作为初始条件时的铁水脱磷特征,选取了脱硅反应所涉及的三种硅类物质(硅铁、SiO_(2)和CaSiO_(3))作为铁水或脱磷剂添加物进行铁水脱磷取样实验,并对各实验中磷的总传质系数进行计算。结果表明,在温度为1400℃、铁水含磷0.3wt%的条件下,当铁水初始硅含量在0.4wt%时,能够获得超过90%的脱磷率。而脱磷剂中初始SiO_(2)含量对脱磷率的影响并不明显。此外,在硅、SiO_(2)和CaSiO_(3)物质的量相同的条件下,使用含CaSiO_(3)脱磷剂的铁水脱磷实验能够获得更高的磷的总传质系数。
In the context of increasing domestic demand for hot-metal dephosphorization and advocating the utilization of solid waste,it is of great practical value to understand the effect of silicon impurities on the hot-metal dephosphorization when industrial solid waste is used to prepare dephosphorizer.Therefore,in order to explore the effect of silicon-based substances on dephosphorization efficiency,the dephosphorization experiments were carried out by using ferrosilicon and SiO_(2) to prepare hot-metals containing different mass fraction of silicon and dephosphorizers containing different mass fraction of SiO_(2).Meanwhile,to further understand the characteristics of hot-metal dephosphorization when different silicon-based substances were used as initial conditions in the slag-iron system,under the condition of ensuring the same molar amount of silicon-based substances,the dephosphorization experiments were carried out by selecting different silicon-based substances involved in desiliconization process as an additive to hot-metal or dephosphorizer,including ferrosilicon,SiO_(2) and CaSiO_(3),and the overall mass transfer coefficient of phosphorus in the three experiments was calculated by theoretical derivation and curve fitting.The results had shown that under the conditions of temperature 1400℃and initial hot-metal phosphorus content of 0.3 wt%,when the initial hot-metal silicon content was 0.4 wt%,the highest dephosphorization efficiency can be obtained.The effect of initial SiO_(2) content in the dephosphorizer on dephosphorization efficiency can be ignored.In addition,under the condition that the molar amounts of silicon,SiO_(2) and CaSiO_(3) were the same,a higher overall mass transfer coefficient of phosphorus can be obtained in the hot-metal dephosphorization by using the dephosphorizer containing CaSiO_(3).
作者
孙国斌
向晓东
Guobin SUN;Xiaodong XIANG(School of Resource and Environmental Engineering,Wuhan University of Science and Technology,Wuhan,Hubei 430081,China;Hubei Provincial Industrial Safety Engineering Technology Research Center,Wuhan,Hubei 430081,China)
出处
《过程工程学报》
CAS
CSCD
北大核心
2021年第8期944-950,共7页
The Chinese Journal of Process Engineering
基金
武汉市应用基础研究计划项目(编号:2016060101010071)。
关键词
铁水
脱磷
硅铁
SIO2
CaSiO3
传质系数
hot-metal
dephosphorization
ferrosilicon
silicon dioxide
calcium silicate
mass transfer coefficient
