Study on the Flotation Purification and Whitening Test of a Low-grade Phosphogypsum in Hubei Province
Phosphogypsum is a solid waste generated by the wet process phosphoric acid process.Aiming at the problems of poor quality,low whiteness,and hardly utilization of phosphogypsum,systematic process mineralogy research by multiple a-nalysis methods including XRD,SEM and micro morphology for a phosphogypsum in Hubei were conducted.Based on which,improving purification removing impurities experiments was conducted.The results indicated that the main mineral composition of the tested phosphogypsum is calcium sulfate dihydrate with main gangue mineral of quartz,meanwhile the small amount of carbon particles,organic matter and water-soluble phosphorus and fluorine is also existed.With the usage of 800 g/t of kero-sene and 10 g/t of 2#oil for carbon removal,100 g/t of 1231 and 300 g/t of MIBC for silicates removal,a full process of"double reverse flotation,regrinding and reselection"could be used for obtaining good indicators of phosphogypsum concentrate with 97.28%purity and 58.15%whiteness.The indexes is better and purity and impurity content of phosphogypsum concen-trate all meet the first class product in Chinese national standard.The success of the experiment points out the direction for large-scale and high value-added utilization of phosphogypsum solid waste.
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