Calcium-based　looping　process　plays　a　vital　role　in　post-combustion　CO2　capture,　fossil　fuel　combustion　and　hydrogen　production.　Carbide　slag　(CS)　is　a　typical　high-calcium　industrial　waste　with　superior　CO2　sorption　capacity,　which　is　an　ideal　calcium　precursor.　In　this　study,　the　highly　stable　calcium-based　CO2　sorbents　were　innovatively　synthesized　via　the　liquid　precipitation　of　carbide　slag　and　binary　doping　materials　(MgO,　NiO　and　ZrO2).　The　as-synthesized　binary　doped　carbide　slag　(CS-MgO-ZrO2)　possessed　an　average　CO2　uptake　of　0.32　g-CO2·g-sorbent−1　during　20　cycles.　Even　under　the　most　severe　calcination　conditions　(at　900　°C　in　100　vol%　CO2),　it　still　maintained　a　stable　capture　capacity　with　a　final　CO2　uptake　of　0.28　g-CO2·g-sorbent−1　after　20　cycles.　Specially,　the　average　decay　rate　of　＇CS-MgO-ZrO2＇　under　the　severe　calcination　condition　was　merely　0.92%　per　cycle,　highly　decreased　by　67.75%　than　carbide　slag.　The　most　likely　stabilization　mechanism　of　binary　doping　was　studied　based　on　various　characterization　techniques,　which　was　concluded　that　MgO　could　improve　the　initial　CO2　uptake,　while　NiO　and　ZrO2　could　increase　the　cyclic　stability.　This　strategy　significantly　enhances　the　cyclic　stability　of　calcium-based　sorbents　via　binary　doping　and　realizes　the　high-value　reuse　of　carbide　slag,　and　is　thus　an　effective　approach　to　post-combustion　CO2　capture.　©　2020　Elsevier　Ltd