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为了在“全三脱”工艺流程中实现炉渣的高效循环利用,将w((P2O5))较低的热态脱碳炉终渣通过渣罐兑入脱磷炉继续发挥脱磷作用。分析结果表明,提高返回渣量及脱磷渣磷分配比均可显著降低脱磷炉石灰消耗量,当渣钢磷分配比及返回渣量控制合适时,脱磷炉可不加入石灰而使半钢磷质量分数达到目标值。对脱碳炉渣在脱磷炉冶炼中的再熔化过程进行计算分析,随着铁水中硅元素的氧化,脱碳渣碱度降低而不断熔化,逐渐发挥脱磷作用。在“全三脱”工艺流程中成功开发了转炉渣热态循环利用工艺,脱磷率提高约6%,返回脱碳渣加入量约为67.13 kg/t,石灰、轻烧白云石和萤石分别节约9.37、1.15和2.45 kg/t,半钢温度提高约7℃。
In order to realize the efficient recycling of slag in the process of “full three-off”, dephosphorization is continued to be carried out by entering into the dephosphorization furnace through a slag pot which has a lower w ((P2O5)). The results show that increasing the amount of return slag and the ratio of dephosphorization slag and phosphorus can significantly reduce the lime consumption of the dephosphorization furnace. When the phosphorus distribution ratio of slag steel and the control of return slag amount are suitable, the dephosphorization furnace can make the semi-steel The phosphorus content reaches the target value. The remelting process of decarburized slag in the smelting of dephosphorization furnace is calculated and analyzed. With the oxidation of silicon in molten iron, the basicity of decarburization slag is reduced and melted continuously, and the dephosphorization effect is gradually exerted. In the “full three off ” process successfully developed converter slag thermal recycling technology, dephosphorization rate increased by about 6%, the amount of returned decontaminated slag is about 67.13 kg / t, lime, light burning dolomite and firefly Stones save 9.37, 1.15 and 2.45 kg / t, respectively, and the semi-steel temperature increases about 7 ° C.