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《Chemical Fertilizer Design》 2008-03
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Recovery of Fluoride in Production Process of Nitrophosphate

GAO Jian-feng,XU Chun-yan,WANG Jiu-fen(Chemistry Department,College of Science and Engineering,Northern China University,Taiyuan Sanxi 030051 China)  
Author has introduced the recovery of potassium fluorosilicate from the mother liquid using the method to add the de-fluor recovery agent in the production process of nitrophosphate.Using the orthogonal experiment,author has proved the influence of the acidity,de-fluor recovery agent,reaction time,feed temperature and adding the ammonium carbonate on the fluoride removal.The ideal conditions of the fluor recovery are: Washing the acidic insoluble in countercurrent direction three times by acidic water at atmospheric temperature,in every time the water consume is 100 ml added for each 100 g wet acidic insoluble,the water after washing is to be returned to mother liquid;the acidity(as nitric acid) of the mother liquid is 46%~40%,the adding quantity of fluor recovery agent GZ-1 is 30~60 g per liter of mother liquid,the feed reaction temperature is 30~40 ℃.Taking the fluor recovery rate being 80% as the example,20 000 t/a of potassium fluorosilicate can be recovered for a consume of phosphor ore 480 000 t/a.
【Fund】: 山西省青年基金(20031012)资助项目
【CateGory Index】: TQ442
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