Technological transformation of fluorine recovery in tail gas from wet-process phosphoric acid plant
The principle of fluorine absorption in tail gas of wet-process phosphoric acid production,and the operation of tail gas washing system of phosphoric acid plant with hemihydrate-dihydrate process in Gansu Wengfu Chemical Co.,Ltd.are introduced.The problems existing in the system are analyzed,including the difficulty in continuously meeting the national emission standards for total fluorine emissions in tail gas,especially the difficulty in controlling dust fluorine emissions;System pipelines and equipment are prone to blockage,requiring a large amount of cleaning work;Insufficient washing and absorption,causing fluoride moving backwards;The process layout and washing pipeline configuration are unreasonable.A renovation plan for the existing problems is proposed.The implementation of technological optimization and transformation has achieved significant effect,with a recovery capacity of 4.7 kg fluorosilicic acid for per ton of P2O5,and exhaust emissions reaching the national standard allowable emission concentration(≤ 9 mg/m3),generating a direct economic profit of 1.128 million RMB Yuan and reducing maintenance cost by over 0.5 million RMB Yuan annually,achieving good economic and social benefits.
wet-process phosphoric acidtail gas washingfluorine recoverytechnological transformationeffect
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