硅类物质在铁水脱磷过程中的影响特征

为探索硅类物质对铁水脱磷的影响，分别利用硅铁和SiO2配制不同硅/SiO2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、SiO2和CaSiO3)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SiO2含量对脱磷率的影响并不明显。此外，在硅、SiO2和CaSiO3物质的量相同的条件下，使用含CaSiO3脱磷剂的铁水脱磷实验能够获得更高的磷的总传质系数。

Characteristics of silicon-based substances effect on hot-metal dephosphorization process

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 SiO2 to prepare hot-metals containing different mass fraction of silicon and dephosphorizers containing different mass fraction of SiO2. 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, SiO2 and CaSiO3, 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 0.3wt%, when the initial hot-metal silicon content was 0.4wt%, the highest dephosphorization efficiency can be obtained. The effect of initial SiO2 content in the dephosphorizer on dephosphorization efficiency can be ignored. In addition, under the condition that the molar amounts of silicon, SiO2 and CaSiO3 were the same, a higher overall mass transfer coefficient of phosphorus can be obtained in the hot-metal dephosphorization by using the dephosphorizer containing CaSiO3.