Journal
RESULTS IN PHYSICS
Volume 9, Issue -, Pages 1096-1101Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.rinp.2018.04.014
Keywords
Flotation; Adsorption; Bis(2-hydroxy-3-chloropropyl) dodecylamine; Quartz; Hematite
Funding
- State Key Laboratory of Mineral Processing [BGRIMM-KJSKL-2016-01]
- Fundamental Research Funds for Central Universities [N160105001, N160106003, N150101001]
- National Natural Science Foundation of China [51374051]
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In order to clarify the effect of polar group modification on flotation performance of amine collector, flotation properties of quartz and hematite using bis(2-hydroxy-3-chloropropyl) dodecylamine (N23) as a collector were investigated. And the adsorption mechanism of N23 on quartz surface was established by zeta potential measurements, SEM/EDS measurements, and molecular structure analysis. Single mineral flotation results indicated that N23 showed stronger collecting ability on quartz and hematite than DDA-CH3COOH. However, starch could depress the flotation of hematite. Flotation recovery of 98.10% for quartz could be achieved, when N23 concentration was 43.33 mg/L and starch concentration was 16.67 mg/L at natural slurry pH. Separation of artificially mixed minerals of hematite and quartz was achieved effectively using N23 as the collector. The optimized separation result with 66.29% iron grade and 90.06% iron recovery in concentrate was obtained when slurry pH was 7.34 with 43.33 mg/L N23 and 23.33 mg/L starch. The interaction energies of N23 with mineral surface also showed well consistency with flotation results. SEM/EDS analyses and zeta potential measurements revealed that N23 could absorb on quartz surface in the forms of strong electrostatic and hydrogen bonding interaction. Compared with DDA, N23 had a higher HLB value and better water-solubility, which resulted in better dispersion in water and stronger adsorption on mineral surface.
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