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Synergistic Impact of Turkey Red Oil and Sodium Oleate on the Separation of Dolomite from Apatite
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DOI：10.1021/acs.langmuir.6c03285.png)
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Abstract
En 中文
Dolomite and apatite exhibit very similar surface chemical properties, while conventional fatty acid collectors show limited selectivity between them, making their efficient separation in phosphate rock flotation a persistent challenge. In this study, a mixed collector system (RF-25), composed mainly of sodium oleate (NaOL) and turkey red oil (TRO), was designed to enhance the separation of dolomite from apatite via reverse flotation. Micro-flotation experiments indicated that the optimal separation performance was obtained at pH 5, with an H3PO4 concentration of 8 × 10–4 mol L–1 and a NaOL:TRO ratio of 4:1. Under these conditions, when the collector concentration was 60 mg L–1, the recovery rates of dolomite and apatite differed by 90.09 percentage points. The results of mixed-mineral flotation further demonstrated the effectiveness of RF-25, where P2O5 recovery reached 95.71% while MgO recovery was reduced to 19.79%. Surface characterization analyses provided insight into the improved selectivity mechanism. TOC and contact angle measurements showed that RF-25 preferentially adsorbed onto dolomite, significantly increasing its surface hydrophobicity compared with that of apatite. FTIR and XPS results further confirmed that a more continuous and complete adsorption layer formed on the dolomite surface, whereas only weak adsorption occurred on apatite. Zeta potential measurements were consistent with these findings, indicating a more pronounced surface modification of dolomite after treatment with RF-25. Overall, the mixed collector enhanced the difference in interfacial properties between dolomite and apatite, thereby improving flotation selectivity. This work demonstrated that RF-25 provided an effective strategy for the selective removal of Mg-bearing gangue minerals in phosphate rock flotation.
Keywords:
Adsorption
Lipids
Minerals
Phosphates
Selectivity
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3.9
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10.6W
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