NDLI: Activation Mechanism of Lead(II) to Ilmenite Flotation Using Salicylhydroxamic Acid as Collector

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Activation Mechanism of Lead(II) to Ilmenite Flotation Using Salicylhydroxamic Acid as Collector

Content Provider	MDPI
Author	Liu, Hang Zhao, Wenqing Zhai, Jihua Lu, Xiaolong Chen, Pan Ren, Xi Sun, Wei Zhang, Chenyang Chen, Wei Wan, Si
Copyright Year	2020
Description	In this study, salicylhydroxamic acid (SHA), which exhibits superior flotation performance to conventional collector benzohydroxamic acid (BHA), was first introduced in ilmenite flotation. The addition of lead(II) can significantly increase the recovery of ilmenite using SHA as collector. Thus, the adsorption mechanism of SHA on lead(II)-activated ilmenite surface was systematically studied using micro-flotation tests, adsorption analysis, zeta potential measurements, Fourier transform infrared spectroscopy (FTIR), and X-ray photoelectron spectroscopy (XPS). Micro-flotation results revealed that SHA had stronger collecting ability than BHA, and ilmenite floatability could be activated by lead ions with either SHA or BHA as collector. Ilmenite showed good floatability at pH 6–8 (over 90% recovery) in the presence of Pb2+ and SHA. In such conditions, the main lead species of Pb(OH)+ and Pb2+ acted as active sites and caused positive surface potential shifts, thereby increasing the adsorbed amounts of negatively charged SHA on the surface of the mineral. FTIR and XPS analyses suggested that the lead species was chemically adsorbed on the surface of ilmenite to form active sites chelated by SHA. Moreover, the free lead ions in solution might form the Pb–SHA complexes to adsorb on the mineral surface, thereby increasing the floatability of ilmenite.
Starting Page	567
e-ISSN	2075163X
DOI	10.3390/min10060567
Journal	Minerals
Issue Number	6
Volume Number	10
Language	English
Publisher	MDPI
Publisher Date	2020-06-24
Access Restriction	Open
Subject Keyword	Minerals Water Science and Technology Ilmenite Lead Ion Flotation Salicylhydroxamic Acid Adsorption Mechanism
Content Type	Text
Resource Type	Article

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