摘要
利用工业固废活化非水溶性钾长石矿,矿化固定二氧化碳(CO_2)并提钾工艺,是同时处理工业固废、开发钾资源、减排CO_2等一举多得的CCUS路线。采用生命周期评价(LCA)方法,以生产含1 t K2O的钾肥为功能单元,以传统的高炉冶炼钾长石制可溶性钾肥并联产白水泥工艺作为参照,对比评价了两种钾长石-工业固废体系矿化CO_2联产钾肥工艺过程的碳减排潜力和经济性。对工艺从原料开采、运输到产品生产的生命周期的温室气体排放量(简称"碳排放")和成本进行了全流程的核算,研究了更全面的产品碳排放和成本分配方法。结果表明,无论是碳排放还是经济性,钾长石-工业固废体系矿化CO_2联产钾肥工艺均较传统工艺有很大提高,碳减排潜力分别可达81.16%和20.48%左右,成本可节约34.75%和45.11%左右。
Using industrial solid waste to calcinate non-water-soluble natural K-feldspar for CO2 mineralization and potassium extraction is a multi-functional CO2 capture, utilization and storage （CCUS） technology that can treat industrial solid waste, utilize potassium resource and reduce greenhouse-gas （GHG）emissions. Life cycle assessment （LCA） was adopted based on a functional unit of the produced potash fertilizer containing 1 ton of K20 to compare two emerging technologies of simultaneous potash fertilizer production and CO2 mineralization from K-feldspar and industrial solid waste （CaC12/phosphor-gypsum） with a traditional technology of potash fertilizer and white cement coproduction by smelting K-feldspar in blast furnace in terms of GHG-reduction potential and economic feasibility. The life-cycle （from raw material exploitation to transportation to production） GHG emissions and life-cycle cost of these technologies were accounted by using an improved allocation approach that considered the credit of avoided GHG emissions/cost from industrial solid waste treatment. The results showed that the two emerging technologies were preferred to the traditional technology in terms of both life-cycle GHG emissions and economic feasibility with GHG-reduction potential of about 81.16% and 20.48%, and cost savings of up to 34.75% and 45.11%, respectively.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2017年第6期2501-2509,共9页
CIESC Journal
基金
国家自然科学基金重点项目(21336004)~~
