The　heavy　metal　gypsum　is　a　hazardous　solid　waste,　which　is　from　the　process　of　lead　and　zinc　metallurgical　industry.　In　this　method,　heavy　metal　gypsum　and　lead　paste　were　used　to　synthesize　PbS　by　pyrogenic　attack.　First　synthesize　CaS　by　the　reducing　of　heavy　metal　gypsum　that　the　pulverized　coal　was　used　as　a　reduction　agent.　Then　the　production　CaS　reacted　with　lead　paste　to　synthesize　PbS　and　the　product　CaO.　The　production　PbS　can　be　reused　as　raw　materials　for　the　process　of　lead　metallurgical　industry　and　CaO　can　be　used　to　replace　some　slag　forming　constituents　or　smelting　flux.　The　two-steps　method　reaction　temperatures　were　1173　K　and　1073　K　respectively　in　a　protective　atmosphere　of　nitrogen,　wherein　the　second　step　was　the　rate-controlling　step.　In　the　final　product,　the　percentage　of　lead　was　70.89%,　which　exceeded　the　standard　level　of　lead　of　industry　standard　for　the　nonferrous　industry　of　China.　At　last,　lead　element　was　almost　removed　from　waste　gypsum　as　PbS,　with　some　lead　free　about　4.5%　which　can　be　recycled　in　the　dust　catcher　system.　In　this　way,　heavy　metal　gypsum　can　be　recycled　environmentally,　economically　and　sustainably.　(c)　2017　Elsevier　Ltd.　All　rights　reserved.