云南省优势矿产尾矿砂捕集及矿化封存CO_(2)潜力分析

Potential of CO_(2) capture and mineralization of dominant mineral tailings in Yunnan Province

为了解云南省尾矿库“两个清单”中保留库的碳减排潜力,使用改进的Steinour方程计算了云南省各州市不同类型尾矿砂的CO_(2)固定量,根据《IPCC国家温室气体列表指南》中提供的方法计算了云南省2011~2020年碳排放量.结果表明,红河州、玉溪市、昆明市尾矿砂的捕集及矿化封存CO_(2)的潜力较大,占云南省保留库尾矿砂CO_(2)矿化封存量的65.79%;铅锌矿、赤泥、锡矿的理论固碳量较高,分别为0.201,0.173,0.158t/t,以上3种尾矿砂的固碳量占云南省尾矿砂固碳量的79.45%;若将云南省保留库堆存的尾矿砂全部用于CO_(2)的矿化封存,可减少2011~2020年间云南省累积碳排放量的2.81%,工业碳累积排放量的3.16%,采矿业碳排放量的12.36%,具有较好的工业应用前景.

The modified Steinour equation was used to calculate the CO_(2) mineralization of different types of tailings in various cities of Yunnan Province to understand the potential for mitigating carbon emissions from the reserve ponds on the"two lists"of tailings ponds in Yunnan Province.The carbon emissions in Yunnan Province from 2011 to 2020 were estimated using the method provided in IPCC Guidelines for National Greenhouse Gas Inventory.The tailings in Honghe Prefecture,Yuxi City,and Kunming City revealed a high potential for CO_(2) sequestration,accounting for 65.79%of the total CO_(2) mineralization sequestration of tailings in Yunnan Province.The theoretical carbon sequestration rate of lead-zinc ore,red mud,and tin ore is relatively high,being 0.201,0.173,and 0.158t/t,respectively.The carbon sequestration of above three tailings accounts for 79.45%of the total carbon sequestration of tailings in Yunnan Province.By using all the reserved tailings for CO_(2) mineralization and sequestration in Yunnan Province,the accumulated carbon emissions from 2011 to 2020 will be reduced by 2.81%,3.16%from the industrial sector,and 12.36%from the mining sector.In summary,CO_(2) capture and mineralization sequestration of tailings could serve as green technologies under dual carbon targets in China.