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Aiming at the characteristics of complex intergrowth and intimate association of various mineral phases in titanium-iron tailings, which lead to difficult mineral separation, this study adopts benzohydroxamic acid as collector, sodium hexametaphosphate as depressant and 2# oil as frother to realize flotation separation of valuable components from titanium-iron tailings. The influences of pulp pH, benzohydroxamic acid dosage, sodium hexametaphosphate dosage, 2# oil dosage and flotation stages on the mass proportion of flotation products, TiO2 recovery rate, TiO2 grade and total iron mass fraction were systematically investigated, and the corresponding reaction mechanism was further discussed. The results show that under the optimal conditions of sodium hexametaphosphate dosage of 500 g/t, benzohydroxamic acid dosage of 35 kg/t, 2# oil dosage of 1 mL and pulp pH=9, the mass proportion of floated product reaches 25.85%, the TiO2 recovery rate is up to 42.23%, the TiO2 grade is 14.93%, and the total iron mass fraction is 15.22%. After six stages of flotation, qualified flotation concentrate is prepared, with the floated product mass proportion of 71.82%, TiO2 recovery rate of 75.81%, TiO2 grade of 27.84% and total iron mass fraction of 24.49%. XRD and FT-IR analysis results demonstrate that the depressant sodium hexametaphosphate can exert an obvious inhibitory effect on pyroxene phase and silica. Benzohydroxamic acid is capable of generating adsorption behavior on the surface of titanium-iron tailings particles, which remarkably improves the overall flotation separation effect.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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