Effect of calcium ions on scheelite flotation using mixed collectors. Issue 1 (2nd January 2019)

• Record Type: Journal Article
• Authors: Dong, Liuyang; Zhu, Hailing; Jiao, Fen; Qin, Wenqing; Jia, Wenhao
• Is Part Of: Separation science and technology. Volume 54:Issue 1(2019)
• Page Start: 153
• Page End: 162
• Publication Date: 2019-01-02
• Subjects: Scheelite -- calcium ions -- mixed collectors -- flotation; Separation (Technology) -- Periodicals; 660.284205
• DOI: 10.1080/01496395.2018.1467451
• Languages: English
• ISSNs: 0149-6395

Abstract

ABSTRACT: The flotation results show that Ca 2+ significantly reduces the flotation recovery of scheelite using single dodecylamine (DDA) or single sodium oleate (NaOL), whereas Ca 2+ hardly affects scheelite recovery using mixed collectors DDA/NaOL. Zeta potential measurements and solution chemistry confirm that the zeta potential of scheelite shows a significant positive shift after conditioning of Ca 2+, which hinders the adsorption of same positively charged DDA on the mineral surface. Simultaneously, the addition of Ca 2+ consumes single NaOL and generates Ca(OL)2 . As for DDA/NaOL, the predominant components are RNH3 + and RCOO − at pH 7; they form new highly active complexes through electrostatic attraction, reducing adverse effect of Ca 2+ . Fourier transform infrared spectroscopy measurements and adsorption measurements further confirm that the pre-adsorption of Ca 2+ does not interfere with the adsorption of mixed collectors.