Study on the kinetics of the conversion of Moroccan phosphogypsum into X2SO4 (X = Na, NH4)

被引：18
作者：
Agayr, Khalid [1 ,2 ]
Chanouri, Hamza [1 ,2 ]
Achiou, Brahim [3 ]
Benhida, Rachid [1 ,2 ]
Khaless, Khaoula [1 ]
机构：
[1] Mohammed VI Polytech Univ, Dept Chem & Biochem Sci, Green Proc Engn CBSGPE, Ben Guerir 43150, Morocco
[2] Univ Cote dAzur, Inst Chim Nice, UMR CNRS 7272, F-06108 Nice, France
[3] Hassan II Univ Casablanca, Fac Sci & Technol Mohammedia, Lab Mat Membranes & Environm, Mohammadia, Morocco
来源：
JOURNAL OF MATERIAL CYCLES AND WASTE MANAGEMENT | 2022年 / 24卷 / 05期
关键词：
Phosphogypsum; Sulfate recovery; Shrinking-core model; Calcium carbonate; NATURAL RADIONUCLIDES; CALCIUM-SULFATE; RARE-EARTHS; WASTE; VALORIZATION; TEMPERATURE; SOLUBILITY; CARBONATE;
D O I：
10.1007/s10163-022-01461-2
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
Phosphoric acid production industries use the wet process, which leads to enormous quantities of phosphogypsum (PG) as a byproduct. The discharge of PG into the oceans is currently considered to be a serious and global issue not only because of environmental damage but also due to economic sulfur loss. In this study, a process of phosphogypsum (PG) conversion was investigated using sodium carbonate (Na2CO3) and ammonium bicarbonate (NH4HCO3). A kinetic study of the conversion was assessed by shrinking-core models (SCMs). The mixed model was proven to be an effective model that fits the experimental data for the conversion using both reagents well. The results reveal that the conversion is controlled by both interfacial reaction and diffusion through the product layer of PG particles. The optimum conversion rate of PG into Na2SO4 was found to be 96-98%. Meanwhile, (NH4)(2)SO4 was obtained from PG with a conversion rate of 96%. This study definitively gives the optimal limitation of two conversion processes, which shows that conversion using sodium carbonate has a good benefit for PG treatment.
引用
收藏
页码：2015 / 2029
页数：15
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