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Pyrogallic acid: A novel depressant for bismuthinite in Mo–Bi sulfide ore flotation

Authors :
Yuehua Hu
Zhiyong Gao
Haisheng Han
Wei Sun
Shangyong Lin
Runqing Liu
Source :
Minerals Engineering. 131:237-240
Publication Year :
2019
Publisher :
Elsevier BV, 2019.

Abstract

Molybdenum ore flotation techniques are constantly challenged by the emergence of complex sulfide minerals, such as bismuthinite, in the mineral processing industry. Conventional flotation depressants, such as sodium sulfide, used in Mo–Bi-containing ore flotation require high dosages, which leads to high cost and low selectivity. Therefore, in this study, pyrogallic acid (PA), a widely distributed organic source, is tested as an alternative depressant to selectively depress bismuthinite in Mo–Bi sulfide ores from Shizhuyuan. Results show that PA has a minimal effect on molybdenite recovery; by contrast, PA has a high depressing effect on bismuthinite amelioration. At 500 g/t PA, molybdenum recovery slightly decreases by 2 percentage points, and bismuth content in molybdenum concentrate sharply declines by 34 percentage points, with respect to samples floated without PA. Batch flotation tests demonstrate that PA addition affects froth stability, as indicated by the variations of solid and water recoveries. The superior selectivity of molybdenite over bismuthinite is promoted by increasing the PA dosage. On the basis of these findings, PA is a feasible option and thus can be used as a depressant for bismuthinite in the flotation of sulfide minerals.

Details

ISSN :
08926875
Volume :
131
Database :
OpenAIRE
Journal :
Minerals Engineering
Accession number :
edsair.doi...........a0fd895f4e48b1833915681a8141440f