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应用超基性岩尾矿封存CO2——以金川铜镍矿尾矿为例

DOI: 10.3969/j.issn.1001-7410.2011.03.09, PP. 464-472

Keywords: 二氧化碳,矿物封存,超基性岩尾矿,金川铜镍矿,碳酸盐化,五水菱镁矿,综合利用

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Abstract:

通过CO2矿物封存可以降低人类活动产生的温室气体的排放,富镁硅酸盐矿物经碳酸盐化作用转化为镁碳酸盐矿物可以实现CO2的封存,而超基性岩尾矿是CO2矿物封存的理想原料。我国可用于封存CO2的超基性岩尾矿包括铜镍矿尾矿、石棉尾矿、蛇纹石尾矿以及钒钛磁铁矿尾矿等。本文重点介绍金川铜镍矿尾矿的粒度、矿物组成、常量和微量元素,以及其自然风化固碳能力和CO2封存潜力。该研究通过对金川铜镍矿1号尾矿坝和2号尾矿坝样品的粒度、元素、红外光谱、扫描电镜、X-射线衍射以及选择性淋溶结果分析,发现1号尾矿坝和2号尾矿坝中五水菱镁矿(lansfordite)的平均含量分别为4.19wt%和1.95wt%,初步估算出金川铜镍矿尾矿自然风化固定大气中CO2的量高达70.68×104t。对尾矿中所含有价金属进行综合利用可以极大的降低CO2矿物封存成本。

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