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 K2O to compare two emerging technologies of simultaneous potash fertilizer production and CO2 mineralization from K-feldspar and industrial solid waste (CaCl2/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.