The　use　of　calcium　carbide　sludge　(CCS)　as　a　substitute　for　limestone　is　an　effective　method　for　reducing　CO2　emissions　in　the　cement　industry.　In　this　study,　a　life　cycle　assessment　(LCA)　was　performed　to　assess　the　greenhouse　gas　(GHG)　emission　reduction　potential　of　CCS　cement　clinker　compared　to　that　of　Portland　cement　clinker.　The　results　showed　that　the　global　warming　potential　(GWP)　of　CCS　cement　clinker　was　approximately　31%　lower　than　that　of　Portland　cement　clinker.　However,　this　may　have　other　environmental　impacts　owing　to　the　extra　energy　used　for　CCS　pretreatment.　The　environmental　impacts　of　three　typical　CCS　cement　clinker　production　scenarios　were　compared,　and　the　results　demonstrated　that　Scenario　2　(CCS　pretreated　by　mechanical　dehydration　and　dried　using　a　coal-drying　machine)　was　the　best　among　these　three　scenarios　from　the　perspective　of　environmental　performance.　An　optimization　scheme　for　CCS　pre-drying　system　(using　waste　heat　from　clinker　kiln　for　drying　CCS)　in　Scenario　2　was　also　proposed　and　had　the　potential　to　decrease　the　environmental　impact.　Finally,　sensitivity　analysis　revealed　that　other　factors　(e.g.,　CCS　transport　distance,　CCS　content)　may　affect　the　GHG　emissions　and　other　environmental　impacts　of　CCS　cement　clinker,　which　should　be　considered　in　practical　applications.　This　case　study　demonstrates　that　non-carbonate　alternative　materials　should　be　actively　explored　for　their　application　in　the　cement　industry,　and　a　series　of　emission-reduction　technologies　should　be　developed　for　GHG　generated　from　industrial　process.