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Abstract
Froth washing tests at the first and second carbonate cleaner banks were performed from November 30 to December 9, 1989 for Niobec. The objective was to minimize the Nb2O5 loss in the carbonate flotation, which is 5¾ at a grade of 0.18%. The old circuit was washed with a perforated pipe distributor on both sides of the cell. Froth washing always achieved lower Nb2O5 grades at the carbonate concentrate. The maximum decrease in Nb2O5 grade was 34% relative. There was significant variation in recoveries. The use of Nb2O5 and P2O5 recovery/recovery curves showed that it was possible to achieve a higher P2O5 recovery at the same Nb2O5 loss with froth washing. Both carbonate cleaner banks have to be washed for better metallurgical performance. Metallurgical improvements with froth washing were supported by vertical froth grade profiles. For the pyrochlore circuit, a two-hour test showed a 1.2% increase in Nb2O5 recovery at a slightly higher grade. SiO2 and P2O5 recoveries are 3% and 9% lower with froth washing, respectively. A two-day test showed significant increase in Nb2O5 grade and decrease in SiO2 grade.

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	All Years to Access Full-Text Export citations Froth washing tests at Niobec By Muammer Kaya, Samad Banisi and A. Laplante Published in Report' Submitted to the services T. M. G. Inc., McGill Univ., 1990 at 1990 Direct link: http://kmpchemmat.ir/pii/32457 Abstract Froth washing tests at the first and second carbonate cleaner banks were performed from November 30 to December 9, 1989 for Niobec. The objective was to minimize the Nb2O5 loss in the carbonate flotation, which is 5¾ at a grade of 0.18%. The old circuit was washed with a perforated pipe distributor on both sides of the cell. Froth washing always achieved lower Nb2O5 grades at the carbonate concentrate. The maximum decrease in Nb2O5 grade was 34% relative. There was significant variation in recoveries. The use of Nb2O5 and P2O5 recovery/recovery curves showed that it was possible to achieve a higher P2O5 recovery at the same Nb2O5 loss with froth washing. Both carbonate cleaner banks have to be washed for better metallurgical performance. Metallurgical improvements with froth washing were supported by vertical froth grade profiles. For the pyrochlore circuit, a two-hour test showed a 1.2% increase in Nb2O5 recovery at a slightly higher grade. SiO2 and P2O5 recoveries are 3% and 9% lower with froth washing, respectively. A two-day test showed significant increase in Nb2O5 grade and decrease in SiO2 grade.