Valorisation of phosphogypsum waste as K2SO4 fertiliser and portlandite Ca(OH)2. (29th January 2021)

• Record Type: Journal Article
• Authors: Alaoui-Belghiti, H. El; Zdah, I.; Ennaciri, Y.; Ouatib, R. El; Bettach, M.
• Is Part Of: International journal of environment and waste management. Volume 27:Number 3(2021)
• Page Start: 363
• Page End: 377
• Publication Date: 2021-01-29
• Subjects: phosphogypsum -- wet process -- conversion -- portlandite -- arkanite -- industrial waste; Refuse and refuse disposal -- Environmental aspects -- Periodicals; Refuse collection -- Environmental aspects -- Periodicals; Recycling (Waste, etc.) -- Periodicals; 363.72805
• Languages: English
• ISSNs: 1478-9876

Abstract

Series of experiments were performed to follow the reactivity of Moroccan phophogypsum with KOH in order to valorise this environmentally harmful solid waste. The experiments were carried out in aqueous solution under different conditions: with excess of reagent KOH or in stoichiometric proportions and by varying reaction duration at room temperature. The complete decomposition of phosphogypsum (PG) waste into portlandite Ca(OH)2 and arkanite K2 SO4 was evidenced by X-ray diffractometry and Fourier transform infrared spectroscopy. The optimum decomposition was obtained with stoichiometric mixture using 0.6 M phosphogypsum and 1.2 M KOH. The full decomposition of phosphogypsum was achieved at room temperature in one hour. The results show how phosphogypsum can efficiently converted to valuable products with high purity and in mild conditions.