Journal
MINERALS ENGINEERING
Volume 170, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.mineng.2021.106981
Keywords
Sodium tripolyphosphate; Scheelite; Calcite; Flotation separation; Adsorption
Funding
- National Natural Science Foundation of China [51904339, 51974364]
- Key Laboratory of Hunan Province for Clean and Efficient Utilization of Strategic Calcium-containing Mineral Resources [2018TP1002]
- Co-Innovation Centre for Clean and Efficient Utilization of Strategic Metal Mineral Resources, and Postgraduate independent exploration and innovation project of Central South University [2018zzts224]
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Sodium tripolyphosphate shows potential as a depressant for selectively separating scheelite from calcite in flotation process. Selective adsorption of sodium tripolyphosphate on calcite inhibits the further adsorption of FX-6, preventing calcite flotation while maintaining scheelite floatability. Sodium tripolyphosphate could be a promising alternative depressant for scheelite-calcite flotation separation.
The potential of sodium tripolyphosphate as a depressant for selective flotation separation of scheelite from calcite is investigated by the micro-flotation tests and industrial scale tests in this study. The depression mechanism of sodium tripolyphosphate is also studied by adsorption measurement, Zeta potential measurement and FTIR spectra. As suggested from the flotation test results, sodium tripolyphosphate have a good selective depression effect on calcite. The results of adsorption test, Zeta potential measurement, and FTIR spectra indicate that the selective adsorption of sodium tripolyphosphate on calcite surface hindered the further adsorption of FX6 type sodium oleate (FX-6) on calcite surface, which prevented the flotation of calcite. However, the pretreatment of sodium tripolyphosphate have little effect on the subsequent adsorption of FX-6 on the scheelite surface, and scheelite still maintain good floatability. The selective adsorption of sodium tripolyphosphate occur between phosphate and Ca2+ exposed on the calcite surface. Sodium tripolyphosphate have the potential to be used as an alternative calcite depressant to the flotation separation of scheelite and calcite.
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