摘要
山东某电厂产生的脱硫石膏目前仅作为水泥及其制品的常规掺和料和普通石膏制品的生产原料直接出售,售价低廉。为提高该脱硫石膏的综合利用附加值,对其进行了常压NaCl盐溶液水热法制备α-半水石膏的试验研究。试验以制品结晶水含量和制品中结晶体的微观形貌为判据,对工艺条件进行了优化,最终确定的盐溶液浓度为20%,料浆浓度为20%,料浆pH为自然状态,反应温度为100℃,反应时间为3 h。在此条件下,所得制品的结晶水含量为8.74%,结晶为平均长径比=4∶1的柱状体。X射线衍射分析结果证明,制品中的主要物相确实为α-半水石膏。
The desulfurated gypsum produced by a power station in Shandong is normally sold in lower price as common mixture of cement and the relate product,as well as raw material for making common gypsum product.In order to increase the added value of the desulfurated gypsum products,experiments on preparation of α-hemi-hydrate gypsum（α-HH） by NaCl salt solution at normal pressure were carried out.Based on the crystal water content and crystal microstructure of the product,the process was optimized to finally determine the concentration of salt solution 20%,slurry concentration 20%,natural pH value,and reaction temperature of 100 ℃ for 3 h.Under this condition,the cylindrical crystallization with crystal water content of 8.74% and average length to diameter ratio of 4∶ 1 were achieved.XRD analysis proved that the main phase in the product is α-HH indeed.
出处
《金属矿山》
CAS
北大核心
2014年第8期175-180,共6页
Metal Mine
基金
2013年地方高校国家级大学生创新创业训练计划项目(编号:201310433026)
关键词
脱硫石膏
Α-半水石膏
常压盐溶液水热法
结晶水含量
微观形貌
Desulfurated gypsum
α-hemi-hydrate gypsum
Hydrothermal method in salt solution at atmospheric pressure
Crystal water content
Microstructure
