Solubility of Phosphate Rocks in citric Acid
F. G. M. Porto
University of Uberaba, Department of Chemical Engineering, Brazil
https://orcid.org/0000-0003-1213-1342
M.C.A. Neto
University of Uberaba, Department of Chemical Engineering, Brazil
https://orcid.org/0000-0002-4518-1138
J.R.D. Finzer
University of Uberaba, Department of Chemical Engineering, Brazil
https://orcid.org/0000-0001-6139-3619
DOI: https://doi.org/10.20448/journal.510.2018.51.32.36
Keywords: Phosphate rock, Solubility, Citric acid solution
Abstract
Taking into account that phosphate rocks can have high solubility regarding the different kinds of solvents used, dissolution of apatite from different places was applied in 2% citric acid solution. Semi analytical, 0,001g resolution scales for quantifying mass were used as well as Stolhman bottles attached to Wagner-like agitator where the extraction was carried out. Also, a digital spectrometer for doing the reading which determines the phosphate grades was used. The results consisted of a minimum value of 0,33% and a maximum of 28,2% of P2O5 varying according to the origin of the milled samples. The result can be useful for the selection of rocks to be processed.