武汉工程大学学报2023，Vol.45Issue(6)：620-627,8.DOI:10.19843/j.cnki.CN42-1779/TQ.202302002
氧化钙对磷石膏中可溶磷和可溶氟固化性能的影响
Effect of Calcium Oxide on Solidification Properties of Soluble Phosphorus and Soluble Fluorine in Phosphogypsum
摘要
Abstract
Phosphogypsum is a large-scale solid waste produced in wet-process production of phosphoric acid,which is mainly composed of CaSO4·2H2O.The migration of soluble phosphorus and fluorine in the phosphogypsum stack will cause environmental pollution.In this paper,calcium oxide was used to solidify soluble phosphorus and fluorine in phosphogypsum.Response surface analysis shows that the solidification efficiency of soluble phosphorus and soluble fluorine is positively correlated with CaO mass fraction and reaction time,the influence of various factors on the solidification efficiency is in the order of CaO mass fraction>liquid-solid ratio>reaction time.The optimized parameters are CaO mass fraction of 3.30%,liquid-solid ratio of 1.90 and reaction time of 110 min.And the solidification efficiencies of soluble phosphorus and soluble fluorine are 98.6%and 99.7%,respectively.The results of solution chemical calculation show that soluble fluorine is precipitated prior to soluble phosphorus in the solidification process.The results of X-ray diffraction and scanning electron microscopy show that soluble phosphorus is mainly precipitated in the form of CaHPO4∙2H2O,while soluble fluorine in the form of amorphous CaF2.关键词
磷石膏/氧化钙/可溶磷/可溶氟/固化性能Key words
phosphogypsum/calcium oxide/soluble phosphorus/soluble fluorine/solidification properties分类
资源环境引用本文复制引用
董万强,邓祥意,张秋桐,史抒扬,吴康,池汝安..氧化钙对磷石膏中可溶磷和可溶氟固化性能的影响[J].武汉工程大学学报,2023,45(6):620-627,8.基金项目
湖北三峡实验室开放/创新基金(SK211002) （SK211002）
国家重点研发计划重点专项(2022YFC3902702) （2022YFC3902702）
湖南省重点实验室开放基金(2018TP1002) （2018TP1002）
