Journal
MINERALS
Volume 7, Issue 9, Pages -Publisher
MDPI AG
DOI: 10.3390/min7090157
Keywords
flotation; water glass modulus; hetero-coagulation; fluorite; quartz
Funding
- Major State Basic Research Development Program of China (973 Program)
- Innovation Driven Plan of Central South University [2015CX005]
- Collaborative Innovation Center for Clean and Efficient Utilization of Strategic Metal Mineral Resources
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Fluorite is the principal mineral of fluorine and usually coexists with quartz in deposits. The removal of fine quartz in fluorite concentrate is the main problem in fluorite flotation. In this study, the flotation tests on fluorite, quartz and a weight equivalent mixture (all less than 10 m) using water glass (with different modulus) as depressants and sodium oleate as collector were conducted. The mechanism of fine quartz entering the fluorite concentrate was investigated through optional observations and rheology measurements on the flotation pulp. The particle interactions between fine fluorite and quartz under flotation-related conditions were analyzed through zeta potential measurements and DLVO calculations. The results revealed that there existed strong hetero-coagulation between fluorite and quartz particles in the flotation pulp, which could be the main reason for the quartz entering the fluorite concentrate in the flotation process. Water glass with higher modulus could eliminate the hetero-coagulation more totally but inevitably influences the flotability of fluorite.
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