Optimization of wet-process phosphoric acid for high-quality phosphogypsum
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Hanjun Wu 1,2
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Hong Zhou 1,4
 
 
 
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1
School of Chemical and Environmental Engineering, Wuhan Institute of Technology, Wuhan 430073, China
 
2
Key Laboratory for Green Chemical Process of Ministry of Education, Wuhan Institute of Technology, Wuhan 430074, China
 
3
Research and Development Center, Hubei Three Gorges Laboratory, Yichang 443007, China
 
4
Hubei Yangtze Resources Recycling and Equipment Innovation R&D Center Co., Ltd, Wuhan 430223, China
 
 
Publication date: 2024-09-05
 
 
Corresponding author
Hong Zhou   

School of Chemical and Environmental Engineering, Wuhan Institute of Technology, Wuhan 430073, China
 
 
Physicochem. Probl. Miner. Process. 2024;60(5):192938
 
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ABSTRACT
The chronic accumulation of phosphogypsum (PG) has resulted in significant environmental contamination issues within the wet-process phosphoric acid (WPPA) industry. An innovative technical route for transforming PG into a resource has been achieved through the introduction of floc flotation and acid cleaning in WPPA. The floc flotation using cationic polyacrylamide as a flocculant and micro lotion, which is composed of dioctyl phthalate, polyoxyethylene(10)nonylphenyl ether, kerosene, and n-octanol as a collector, has been performed. The effect of floc flotation on product quality and the underlying mechanisms were investigated by XRF, FT-IR, SEM, and 2-dimensional fractal dimension analysis. The optimal parameters were determined through a factor experiment, which yielded the following results: floc flotation temperature 65 ℃, cationic polyacrylamide 180 g/Mg, collector 1.08 kg/Mg, and flushing sulfuric acid concentration 20%. The resulting PG exhibited a high grade of 95.01%, whiteness of 70.8%, and gypsum recovery of 93.52%. Furthermore, the soluble phosphorus and soluble fluorine levels are below 0.1%. In the flotation process, the combination of polyacrylamide and collector effectively separated fine organic matter and siliceous material with a hydrophobic bubble, facilitating their upward movement and subsequent separation from PG. The new WPPA, which exhibits enhanced product quality and reduced production costs, can be utilized extensively within the WPPA.
eISSN:2084-4735
ISSN:1643-1049
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