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Open AccessArticle

Selective Flotation of Pyrite from Galena Using Chitosan with Different Molecular Weights

by 1,2, 1,2, 1,2, 1,2,3,4,* and 1,2,*
1
School of Minerals Processing and Bioengineering, Central South University, 410083 Changsha, China
2
Key Laboratory of Hunan Province for Clean and Efficient Utilization of Strategic Calcium−Containing Mineral Resources, Central South University, 410083 Changsha, China
3
Guangdong Institute of Resources Comprehensive Utilization, 510651 Guangzhou, China
4
Guangdong Provincial Key Laboratory of Development and Comprehensive Utilization of Mineral Resources, 510651 Guangzhou, China
*
Authors to whom correspondence should be addressed.
Minerals 2019, 9(9), 549; https://doi.org/10.3390/min9090549
Received: 29 July 2019 / Revised: 5 September 2019 / Accepted: 6 September 2019 / Published: 12 September 2019
(This article belongs to the Section Mineral Processing and Metallurgy)
Pyrite is a major gangue mineral associated with galena and other valuable minerals, and it is necessary to selectively remove pyrite to upgrade the lead concentrate by froth flotation. In this study, the flotation experiments of a single mineral and mixed minerals were performed using chitosan with different molecular weights (MW = 2−3, 3−6, 10 and 100 kDa) as a depressant, ethyl xanthate as a collector, and terpineol as a frother, in a bid to testify the separation of pyrite from galena. Flotation results showed that the selective flotation of pyrite from galena can be achieved under the preferred reagent scheme, i.e., 400 g/t chitosan (10 kDa), 1600 g/t ethyl xanthate, and 100 g/t terpineol, while chitosan with other molecular weights cannot. Furthermore, the results of the zeta potential and contact angle measurements revealed that chitosan (10 kDa) has a strong adsorption on galena yet a very weak adsorption on pyrite at the dosage of 400 g/t. This study showed that chitosan (10 kDa) has great potential in the industrial flotation separation of pyrite from lead concentrates. View Full-Text
Keywords: chitosan; molecular weight; selective depression; reverse flotation; pyrite; galena chitosan; molecular weight; selective depression; reverse flotation; pyrite; galena
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MDPI and ACS Style

Zhang, W.; Sun, W.; Hu, Y.; Cao, J.; Gao, Z. Selective Flotation of Pyrite from Galena Using Chitosan with Different Molecular Weights. Minerals 2019, 9, 549.

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