中低品位磷矿生产磷酸联产石膏晶须技术现状

Present Status of Technology for Co-Production of Phosphoric Acid and Gypsum Whiskers from Medium- and Low-Grade Phosphate Rock

阐述了中低品位磷矿生产磷酸联产石膏晶须工艺技术的意义,并介绍了该工艺技术的基本原理和应用前景。采用盐酸和硫酸萃取磷矿并添加活性添加剂提高磷矿萃取速度和磷矿分解率,分离酸不溶物和部分杂质(铁、铝、镁),然后采用硫酸脱钙获得石膏晶须和磷酸,为中低品位磷矿综合利用提供了一条可行的途径。

A description is given of the technology for the co-production gypsum whiskers from medium- and low-grade phosphate rock and its of phosphoric acid and significance, also the fundamental principles of the technology and prospects for its use. Hydrochloric acid and sulfuric acid react with phosphate rock with the addition of an active additive to increase the extraction rate and decomposition rate of the rock, the acid-insolubles and some impurities （iron, aluminum and magnesium） are separated acid and gypsum whiskers, out, and then sulfuric acid is used for decalcification to obtain phosphoric thereby providing a feasible route for comprehensive utilization of medium- and low-grade phosphate rock.