Affiliation:
1. University of Science and Technology
2. Yuntianhua International Chemical co.Ltd
Abstract
Possible ways to remove fluoride from phosphoric acid are extraction,but there are always generated a second organic phase ,where still have small amounts of impurities such as fluoride,sulfate,iron,aluminum and heavy metals. The traditional process using pure water or dilute phosphoric acid washing the organic phase to get phosphoric acid ,but the impurities removing rate is not obvious.This study explore a new way to changes the washing detergent,using dilute alkali solution to reduce fluoride content of stripping in phosphoric acid.The optimization of experimental conditions is dilute alkali mass fraction 20%,dosage 0.4%,temperature 45°C,the defluorization rate can be 67.75% and phosphorus pentoxide yield rise to 95.50%.This study provides a new idea to improve defluorination rate in industrial production.
Publisher
Trans Tech Publications, Ltd.
Reference6 articles.
1. Sietse van der Sluis, Annie H.M. Schrijver, Frits P.C. Baak, andGerda M. van Rosmalen. Ind. Eng. Chem., Vol. 27, NO. 3, (1988).
2. Nair C.S. B; Radhakrishnan, B; Sasikumar,N. The Purification of Wet-Process Phosphoric Acid by Selective Solvent Extraction. Process of the 1nd International Congress on Phosphorus Compounds, Boston, MA, April 21-25, 1980; pp.541-556.
3. Kavitha Jayachandran I.C. Pius, Chetty K, et al: Industrial& Engineering Chemistry Research. Vol. 52(2013), pp.5418-5477.
4. A.A. EI-Bayaa N.A. Badawy A.M. Gamal I.H. Zidan A.R. Mowafy. Journal of Hazardous Materials (2011), pp.324-229.
5. L.A. Guirguis H.K. Fouad R.M. EL-Rakaiby, Purification of commercial phosphoric acid to the food grade quality by liquid/liquid solvent extraction, Mansoura J. Chem. 35(2008): 51-72.