根据国内钢铁生产的特点,定义了综合相对环境指数IREI,并在此基础上建立了钢铁生产环境负荷评价的累积对比模型.将该模型应用到国内几种典型的钢铁生产流程评价中,结果表明,评价结果具有可对比性,可以定量化;与高炉-转炉流程相比,直接还原铁的IREI值为0.615,电炉流程吨粗钢的IREI值分别为0.513(特钢),具有较明显的环境优势;此外,以废钢为原料的电炉钢普钢流程的环境负荷也明显小于高炉-转炉流程,其吨粗钢IREI值为0.504.
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