摘要
化学石膏的资源化利用是保护环境、实现可持续发展的重要课题之一。磷石膏是排放量最大的化学石膏,而磷石膏中的可溶性磷和氟是影响建筑石膏性能的主要因素,采用石灰中和法将磷石膏中的可溶性磷和氟变成难溶于水的稳定物质,消除其对建筑石膏性能的影响,同时对磷石膏的煅烧工艺进行研究,并对显微结构进行了观察。结果表明,加入3%生石灰,中和预处理磷石膏,通过150℃煅烧,陈化4d所得建筑石膏性能稳定,改善了磷石膏结构疏松、空隙率大的缺陷,可达到GB9776—88《建筑石膏》优等品要求。
Resource utilization of chemical gypsum is one of the important tasks to protect environment and to achieve sustainable development. Phosphogypsum is chemical gypsum with the greatest discharge amount and the soluble phosphorus and fluorin in phosphogypsum are main factors affect the performance of building plaster. Lime neutralization process is adopted to make soluble phosphorus and fluorin in phosphogypsum into stable material that is difficult to dissolve in water, so as to eliminate their influence on performance of building plaster, and study is also made on calcining process of phosphogypsum and observes its microstructure.The result shows that building plaster that is prepared by adding 3% quicklime,neutralization pretreatment of phosphogypsum,calcining at 150 ℃ and aging for 4d has stable performance,improve the deflects of phosphogypsum such as loosen structure and high percentage of void and meets the requirement of best quality in standard GB 9776--88 ＂Building Plaster＂.
出处
《新型建筑材料》
北大核心
2007年第7期48-52,共5页
New Building Materials
关键词
磷石膏
建筑石膏
资源化
预处理工艺
phosphogypsum
building plaster
resource
pretreatment process
