Based　on　the　physical　and　chemical　properties　of　carbide　slag,　the　contents　of　heavy　metals　in　effluent　came　from　carbide　slag　drying　process　were　studied,　and　then　the　composition　of　exhaust　gas　emitted　from　the　carbide　slag　drying　process　and　calcinations　process　of　raw　materials　prepared　with　carbide　slag　was　detected,　in　order　to　know　whether　there　are　harmful　or　corrosive　gases　released　and　the　effect　of　the　emissions　on　the　environment　and　related　equipments.　The　results　indicate　that　the　exhaust　gases　emitted　from　the　calcination　process　of　raw　meal　prepared　with　carbide　slag　is　mainly　composed　of　CO2　and　water　vapor,　and　is　free　from　harmful　gases.　However,　a　lot　of　water　in　carbide　slag　during　the　pre-heat　and　decomposition　process　under　high　temperature　would　accelerate　the　corrosion　of　equipments.　Simultaneously,　a　small　number　of　heavy　metal　ions　contained　in　the　carbide　slag　can　cause　environmental　pollution　and　sulfides　would　be　adverse　to　the　cement　calcination　process　resulting　in　the　crust　blockage　of　kiln.　©　(2014)　Trans　Tech　Publications,　Switzerland.