Reduction of P2O5 and F from Phosphogypsum by CaO addition

Sri Rachmania Juliastuti*, Nuniek Hendrianie, Yumna Dian Pawitra, Irham Raditya Putra

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

5 Citations (Scopus)

Abstract

Waste of Phosphoric acid industry, which called phosphogypsum consists of 65% gypsum, 25% water and 10% impurities. Phosphogypsum can only be used up to 15% and the rest is thrown away. The objective purpose of this study is to reduce the content of P2O5 and F using best variable CaO and stirring during coagulation process, flocculation and sedimentation. The method of this experiment is conducted by using the ratio of phosphogypsum and variable distilled water 1:1, 1:2 and 1:3, and then put it into a jar test using the variable stirring of 100 and 150 rpm. Then 11, 12 and 13 gram CaO and 50 ml distilled water is added as variables for coagulation - flocculation process. pH is kept at 6 by adding 4% NaOH. Polyalumunium chloride (PAC) 0.1% as much as 1.75 mg/l is added into the mixture and stirred at 30 rpm for 20 minutes. The separation of P2O5 and F, is done by the sedimentation process. These experimental results show that variable 1:2 (w/v), 12 gram CaO and 150 rpm stirring able to reduce fluoride and P2O5 up to 98.5% and 50% from phospogypsum.

Original languageEnglish
Article number03021
JournalMATEC Web of Conferences
Volume156
DOIs
Publication statusPublished - 14 Mar 2018
Event24th Regional Symposium on Chemical Engineering, RSCE 2017 - Semarang, Indonesia
Duration: 15 Nov 201716 Nov 2017

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