磷石膏无害化处理工艺技术研究

Study of Process Technology for Safe Disposal of Phosphogypsum

以石灰化学固化磷石膏的水溶磷及游离氟,并中和其中的H+,磷石膏无害化处理工艺条件为:磷石膏与石灰质量比200∶1,磷石膏含水率25%,反应温度30℃,反应时间60 min。该工艺条件下,磷石膏浸出液中磷及氟质量浓度均小于15 mg/L,达到国家排放标准。

Lime is employed for chemical fixation of water soluble phosphorus and free fluorine in the phosphogypsum,and neutralization of the contained H+,the process conditions for safe disposal of phosphogypsum are: mass ratio between phosphogypsum and lime is 200 ∶ 1,water content of phosphogypsum is 25%,reaction temperature is 30 ℃,reaction duration is 60 min. Under such process conditions,the mass concentrations of phosphorus and fluorine in the phosphogypsum leaching solution are both below 15%,which meet the national discharge standard.