湿法磷酸生产中萃取尾气氟资源回收利用
Recovery and utilization of fluorine resources from extracted tail gas in WPA production
张存康 1严达攀 1徐明成1
作者信息
- 1. 云南云天化云峰化工有限公司,云南宣威 655413
- 折叠
摘要
由于湿法磷酸装置萃取尾气洗涤系统氟资源回收有限,造成磷石膏、渣场酸性水中含氟物质不断增加,不仅对环境造成影响,而且制约其他资源的再利用.为提高磷酸生产中氟资源的回收利用率,对20万t/a磷酸装置萃取尾气洗涤装置进行改造,介绍改造方案、氟回收工艺流程及工艺指标控制.改造后每生产P2O5 1 t,尾气洗涤系统氟硅酸回收量增加10.6 kg,渣场水中w(F)降低50％左右,实现经济效益和环境效益的统一.
Abstract
Due to the limited recovery of fluorine resources in the extraction tail gas washing system of the WPA plant,the fluorine content in the phosphogypsum and acidic water of slag yard continues to increase,which not only affects the environment but also restricts the reuse of other resources.In order to improve the recovery and utilization rate of fluorine resources in phosphoric acid production,a renovation plan,fluorine recovery process flow and process index control are introduced for the extraction tail gas washing device of a 200 kt/a phosphoric acid plant.After the renovation,for every 1 ton of P2O5 produced,the yield of fluosilicic acid has been increased by 10.6 kg.The fluorine content in the slag yard water is decreased by about 50％,achieving a unity of economic and environmental benefits.
关键词
湿法磷酸/萃取尾气/氟/回收利用/效益Key words
wet-process phosphoric acid(WPA)/extracted tail gas/fluorine/recovery and utilization/benefit引用本文复制引用
出版年
2024
NETL
NSTL
万方数据