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根据新余钢铁集团公司第二炼钢厂的精炼渣循环利用数据,分析了热态精炼渣补加石灰后脱硫的效果。研究结果表明熔渣碱度为2~3的热态精炼废渣仍具有一定的硫容量,通过补加一定量的石灰可提高其脱硫能力。现场试验表明,向熔渣碱度为2~3的热态精炼渣中补加3~4kg/t的石灰,并加一定量的萤石,脱硫率达到80%以上;并对循环利用的精炼渣进行XRD及EDS物相分析,利用矿相显微镜查看循环利用后的渣的形貌变化,通过分析发现循环利用两次的热态渣岩相种类基本不变,主要为C2S、C3S、C2A、CA,但随着循环次数的增加,钙铝酸盐增多,熔渣混合状况得到改善。热态精炼渣的循环使用的意义不仅在于节约了成本而且降低了对环境污染的危害。
According to the recycling data of refining slag of the second steel mill of Xinyu Iron and Steel Group Company, the effect of desulfurization after adding lime by hot refining slag was analyzed. The results show that the hot slag with the basicity of 2 to 3 still possesses a certain sulfur capacity, which can be increased by adding a certain amount of lime. Field tests show that adding 3-4 kg / t of lime to a hot refining slag having a slag basicity of 2 to 3 and adding a certain amount of fluorite, the desulfurization rate reaches more than 80%; and refining of recycling The slag was analyzed by XRD and EDS, and the morphologies of the slag after recycling were observed by using the phase microscope. According to the analysis, it was found that the types of the thermal slag and rock that were recycled twice were basically the same, mainly C2S, C3S, C2A, CA, but with the increase in the number of cycles, calcium aluminate increased, slag mixing conditions improved. Recycling hot refining slag not only means that the cost savings but also reduce the hazards of environmental pollution.