石灰石替代部分石灰进行脱磷的实验分析

为了研究石灰石替代石灰的比例(即石灰石替代比)及加入方式对脱磷效果的影响,通过调整石灰石加入量在真空感应炉内进行热态实验。实验结果表明:采用石灰石替代石灰进行造渣炼钢是切实可行的,而且石灰石加入方式对脱磷效果有显著影响;石灰石替代比为40%时脱磷效果最好,终点磷含量由初始的0.12%降低至0.012%,相比石灰石替代比为0%的原方案脱磷率提高24.17%;石灰石替代比为80%时出现严重的炉渣结壳现象,冶炼无法正常进行。石灰石脱磷较适宜方案有2种:一是强调降低生产成本,60%石灰石替代比进行冶炼;二是强调提高产品质量,40%石灰石替代比进行冶炼。

Laboratory study on dephosphorization with limestone substituting for some lime

To investigate the effect of the quantity of limestone added to and the way of limestone added into the furnace on dephosphorization efficiency,thermal experiment is carried out in a vacuum induction furnace by changing the quantity of added limestone.The experiment results show that it is feasible to substitute limestone for lime to slag,and how the limestone is added to the furnace plays a significant influence on dephosphorization.When the substitution ratio is 40%,thermal experiment gets the best result of dephosphorization efficiency with the final phosphorus content reaching 0.012% from the initial number of 0.12%,and the dephosphorization rate increasing by 24.17%.However,much of the slag is in incrustation state,thus the experiment couldn’t be carried out normally when the ratio reaches 80%. Furthermore,the optimum scheme for dephosphorization with limestone can be described as follows:steelmaking with the substitution ratio of 60% is the best one when lowering production cost is the first concern,while 40% is the best when the quality is cared most.