【作者】 吴拓； 张延玲； 袁方； 张康晖；

【Author】 Wu Tuo;Zhang Yanling;Yuan Fang;Zhang Kanghui;State Key Laboratory of Advanced Metallurgy;

【机构】 钢铁冶金新技术国家重点实验室；

【摘要】 针对某企业的不锈钢渣的分析表明,（Fe+Cr+Mn）含量为12.8%,其中Cr主要存在于含铬尖晶石相中。在小型感应炉中进行了不锈钢渣的高温还原实验,重点考察了还原剂种类以及加入方式、终点渣碱度以及Al₂O₃含量、温度对渣中残铬以及铬还原率的影响。结果表明,1550℃下,加入固态还原剂后渣中铬显著降低,Al和过量的硅铁可将渣中的铬还原至0.12%;以C为主要还原剂时,配加少量的硅铁可以促进铬的还原。本实验条件下,最佳渣碱度为1.2,Al₂O₃含量对铬的还原影响不大,温度越高越有利于降低渣中的铬含量。在1650℃下,以Fe-2.0C为金属熔池,按n_C∶n_O=1.0和n_Si∶n_O=0.1配加还原剂,调节渣碱度为1.2后,得到的Fe-7.5%Cr-C合金可以作为不锈钢冶炼的原料使用。更多还原

【Abstract】 An analysis for the stainless steel slag from an enterprise showed that the total content of（Fe+Cr+Mn） is 12.8%, and Cr mainly existed in the Cr-containing spinel phase. A small induction furnace was used to carry out the high temperature reduction experiment on the stainless steel slag. The effects of reductants type and addition way, slag basicity, Al₂O₃ content and temperature on the residual Cr and chromium reduction rate were investigated. The results indicated that solid reductants significantly reduced the chromium in the slag, especially aluminum and excess Si Fe could reduce the chromium to 0.12% at 1550 ℃. If C was chosen as the main reductant, additional small amount of ferrosilicon promoted the reduction of chromium. Under the current experimental conditions, the optimum slag basicity was 1.2, and the content of Al₂O₃ had little effect on the reduction of chromium. The increase in temperature was beneficial for reducing residual Cr in the slag. At 1650 ℃, with Fe-2.0 C as the metal pool, and with reductants by n_C∶n_O = 1.0 and n_Si∶n_O = 0.1, adjusting slag basicity to 1.2, the Fe-7.5% Cr-C alloy can be obtained and will be used as a raw material for stainless steel smelting.更多还原