中国皮江法炼镁的资源消耗和环境影响分析

应用生命周期评价思想,结合物质流分析方法,对我国皮江法炼镁生产过程中物质能量代谢的数量特征和环境负荷状况进行研究。结果表明:皮江法炼镁工艺的资源和能源输入量较大,1 t商品镁锭的资源输入总量和资源直接输入量分别为76 t和24 t;生态包袱是资源直接输入量的3.1倍。CO2和SO2排放情况的时间序列分析表明,虽然皮江法炼镁单耗指标不断降低,但由于镁产量增加较快,导致CO2和SO2直接排放量连年增长,化石燃料的燃烧和精练保护过程是CO2和SO2直接排放的主要责任者。此外,由硅铁生产引起的资源消耗和环境影响也不容忽视。

Resource depletion and environmental impact analysis of magnesium produced using pidgeon process in China

The study aims to reveal the characteristics of material-energy metabolism and environmental impacts for magnesium produced using the Pidgeon process in China. Life cycle assessment combined with materials flow analysis was used for this study. The results show that the total materials input and direct materials input of Chinese magnesium ingots is 76 t/t Mg ingot and 24 t/t Mg ingot, respectively. The quantity of ecological rucksacks reaches 3.1 times of that of direct materials input. The time series analysis shows that the direct emissions of CO2 and SO2 increase with the rapid development of the magnesium industry, although the consumption factor unit decreases with the time passing. The direct emissions of CO2 and SO2 mainly attribute to the consumption of fossil fuels and the protection of molten magnesium. Furthermore, the material consumption and environmental impacts generated by the ferrosilicon production may not be disregarded.