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石膏是生产水泥的重要原料,在水泥中用作缓凝剂。目前,各水泥厂使用的主要是二水石膏(CaSO_4·2H_2O),其产地大部分在我国西北。东北与沿海地区水泥厂使用的石膏需经过长途运输,距离远,成本高,如交通运输不畅通,还影响水泥生产。硬石膏(CaSO_4)资源在东北、华东、华北等贮量丰富,如何就地取材,利用硬石膏作水泥缓凝剂是一个急待解决的具有实践意义的研究课题。在过去研究、试用硬石膏的基础上,为了保证水泥与混凝土的质量,使采用硬石膏作水
Gypsum is an important raw material for the production of cement and is used as a retarder in cement. At present, the cement plants mainly use dihydrated gypsum (CaSO_4·2H_2O), and most of their production sites are in the northwest of China. The gypsum used in cement plants in the northeast and coastal areas needs to be transported over long distances. The distance is long and the cost is high. If the transportation is not smooth, it also affects cement production. The resources of anhydrite (CaSO 4 ) are abundant in the Northeast, East China, and North China. How to obtain materials locally and use anhydrite as a cement retarder is a practical research topic that needs urgent solution. In the past, on the basis of researching and testing anhydrite, in order to ensure the quality of cement and concrete, anhydrite was used as water.