Global warming impact of the magnesium produced in China using the Pidgeon process
Global warming impact of the magnesium produced in China using the Pidgeon process
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DOI：
10.1016/j.resconrec.2004.02.003
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发表时间：
2004-08
影响因子：
13.2
通讯作者：
S. Ramakrishnan;P. Koltun
中科院分区：
文献类型：
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作者：
S. Ramakrishnan;P. Koltun
中国是世界上最大的镁生产国，目前供应世界镁需求的40-50%。目前对镁的需求增长主要是由汽车工业推动的，汽车轻量化是为了减少排放。中国的镁生产是基于一种热处理工艺，称为皮江法，最初于20世纪40年代在加拿大发明。所用的原材料是白云石，首先将其煅烧，然后使用皮江法通过供应硅铁和热能来还原煅烧的白云石，以生产纯镁冠。然后将镁冠熔化并铸造成纯镁锭，然后从中国出口，以满足不断增长的世界需求。针对全球变暖的影响，利用中国镁生产的平均数据进行了从摇篮到大门的生命周期研究。计算结果表明，中国镁锭从摇篮到大门的全球变暖影响为42 kgCO 2 eq/kgMg锭，在37- 47 kgCO 2 eq/kgMg锭的不确定范围内。中国生产的镁的影响值比铝的全球变暖影响高出60%，铝是一种竞争材料，也是中国生产的。在未来镁产品价值链的背景下讨论了计算出的对镁的影响，该价值链可能对中国生产的镁有很强的依赖性。
China is the largest producer of magnesium in the world, and supplies currently 40–50% of the world demand for magnesium. The current growth in the demand for magnesium is primarily driven by automotive industry for light weighting automobiles to reduce emissions. Magnesium production in China is based on a thermal process, known as the Pidgeon process that was originally invented in Canada in the 1940s. The raw material used is dolomite, which is initially calcined, and the calcined dolomite is reduced using the Pidgeon process by supplying ferrosilicon and thermal energy to produce pure magnesium crowns. The magnesium crowns are then melted and cast as pure magnesium ingots, which are then exported from China to meet the growing world demand. With a focus on the global warming impact, a cradle-to-gate life cycle study is conducted using averaged data for magnesium production in China. Calculations show that the cradle-to-gate global warming impact of Chinese magnesium ingots is 42kgCO2eq/kgMg ingot, within an uncertain range of 37–47kgCO2eq/kgMg ingot. The value of impact for the magnesium produced in China is ∼60% higher than the global warming impact of aluminium, a competing material that is also produced in China in abundance. The calculated impact for magnesium is discussed in the context of the future magnesium products value chain that may have a strong dependence on the magnesium produced in China.