[中图分类号] TQ325. 3 ;TQ221. 242 ;X78 　[文献标识码] B 　[文章编号] 1009 - 7937(2004)01 - 0052 - 03The treatment and reutilization of carbide slagZHAN G You - kun , KAN G Zhao - hui , L I Xiao, Y E Zhao(Institute of Chemistry & Chemical Engineering ,Fuzhou University ,Fuzhou 350002 ,China)　　Key words :PVC;carbide slag;slurry;recovery　　 Abstract :In the production of PVC resin by calcium carbide - acetylene process ,how to treat thelarge amount of carbide slag slurry is a matter of great urgency. In this paper , the processesfor the pri2mary treatment of carbide slag slurry are introduced briefly ,such as natural settling process and me2chanical separation process;methods for the reutilization of carbide slag slurry are discussed:the wastewater can be applied to the preparation of acetylene from calcium carbide and the neutralization of acidwaste water ,while the dry carbide slag can be made into lime ,which can be used as the raw materialsfor the production of calcium carbide ,and can be calcined with coal slag to produce cement or be used ascommon building materials and waterproof coating.　　 采用电石 - 乙炔工艺生产 PVC树脂过程中会有大量的电石渣浆排出 ,1 t 电石和水反应产生的湿电石浆约为 6 t ,其中含水约为 60 %\ue00380 %,折合成干电石渣为 1.2 t 左右[1]。电石渣浆的含水量大、 碱性高 ,且流量大 ,是污水管网的重点污染源;而干电石渣的主要成分是氧化钙(约占 64 %\ue00367 %) ,是高碱性物质 ,pH值可达 14。故电石渣问题成为影响 PVC生产厂规模扩大、 生产发展的主要制约因素 ,如何将电石渣综合回用、 变废为宝已是企业迫在眉睫的课题。目前 ,对电石渣回用的研究实践主要分为渣浆的前期分离处理和电石渣的后期加工回用。