中国东部典型铁镁质尾矿的潜在固碳能力评估

利用铁镁质尾矿与CO2 反应，形成稳定的碳酸盐矿物，是一种新型的、有前途的固定二氧化碳方法，而对于这些尾
矿固碳潜力的评价则是正确利用尾矿的前提。该文通过我国东部两个典型超基性岩带（东海-日照岩带和赤城-朝阳岩带）
10 个矿床尾矿的矿物组分、粒度分布以及相关元素的测定分析，评估不同矿床尾矿的潜在固碳能力。分析结果显示 ：在东海-
日照岩带，尾矿中MgO 的含量较高（36.81%~41.39%），且多以蛇纹石为主，粗粒物质相对较多；而在赤城-朝阳岩带，尾
矿中MgO 含量中等（5.84%~15.60%），而CaO 含量偏高（5.68%~19.28%），矿物组分以各种角闪石为主，尾矿颗粒较细。结
合野外调研和计算，估计赤城-朝阳岩带可以用于封存CO2 的尾矿潜力为4.0×108 t，远远高于东海-日照岩带。综合化学
成分、比表面积、尾矿储量等各方面因素，赤城-朝阳超基性岩带具有很大CO2 封存潜力

Evaluation on Potential Carbon Sequestration Capability of Typical Mafic Tailings in Eastern China

The carbon sequestration by interaction of mafic tailings with CO2 to form a stable carbonate minerals is a new and
promising method for reducing CO2 emission. The evaluation of CO2 sequestration potential of mafic tailings is the essential premise for the reasonable utilization of these tailings. This paper mainly aims at 10 tailings in two typical ultrabasic rock belts (Donghai-Rizhao rock belt and Chicheng-Chaoyang rock belt) of eastern China, and analyzes mineral components, size distributions and major elements of tailing samples. Then a comprehensive evaluation about the carbon sequestration potential is taken for these mafic tailings in the two rock belts based on analysis results. In the Donghai-Rizhao rock belt, tailings are dominated by the serpentine, with higher MgO content (36.81%-41.39%) and relative coarser sizes. Compared with minerals in Donghai-Rizhao tailings, a variety of hornblende are the common minerals in the Chicheng-Chaoyang tailings, with moderate MgO content (5.84%-15.60%), higher CaO content (5.68%-19.28%) and finer sizes. By field survey and calculation with the chemical equation, the carbon sequestration capacity of Chicheng-Chaoyang tailings is estimated about 4.0×108 t, which is much bigger than Donghai-Rizhao tailings. Considering chemical composition, specific surface area, the tailings resources and other factors comprehensively, mafic tailings in Chicheng-Chaoyang rock belt has the large carbon sequestration potential and can be served as one of the most promising storage sites for carbon sequestration.