April 29-May 4, 2018
A pre-concentrated xenotime sample and four selected gangue minerals, ilmenite, zircon, schorl and staurolite were used in this project. Using Octano-hydroxamic acid as a collector, the surface chemistry was investigated through surface area measurements, zeta potential tests and adsorption density determinations. The results of adsorption studies were then correlated with microflotation tests conducted at room temperature in a Partridge-Smith cell. In this paper, the surface chemistry and microflotation behaviors are then discussed based on both lab observations and a literature review.
Further, because of their selective depressing power, sodium silicate and lignosulfonate have been widely used as depressants in rare-earth mineral flotation to separate minerals from specific types of gangue minerals. In this project, the flotation of a xenotime pre-concentrate and pure samples of the gangue minerals ilmenite, zircon, schorl and staurolite using octano-hydroxamic acid and sodium oleate as collectors was conducted in a Partridge-Smith microflotation cell. The flotation of the mixed samples (weight ratio=1:1) of xenotime and each one of its gangue minerals was also investigated at room temperature and 80°C, using sodium silicate and ammonium lignosulfonate in the presence of octano-hydroxamic acid and sodium oleate respectively. The flotation results are described and compared with those observed by previous researchers. The effects of sodium silicate and ammonium lignosulfonate on weight recoveries and grade of xenotime are also discussed and compared.
Corby Anderson and Yicheng Zhang, "The Surface Chemistry and Microflotation of Xenotime and Depression of Gangue Minerals" in "Beneficiation of Phosphates VIII", Dr. Patrick Zhang, Florida Industrial and Phosphate Research Institute, USA Professor Jan Miller, University of Utah, USA Professor Laurindo Leal Filho, Vale Institute of Technology (ITV), Brazil Marius Porteus, Foskor-Mining Division, South Africa Professor Neil Snyders, Stellenbosch University, South Africa Mr. Ewan Wingate, WorleyParsons Services Pty Ltd., Australia Prof. Guven Akdogan, Stellenbosch University, South Africa Eds, ECI Symposium Series, (2018). http://dc.engconfintl.org/phosphates_viii/23