Full
Outline
Due to the characteristics of low grade and fine disseminated particle size, lean hematite is prone to overgrinding in grinding operations, resulting in a large number of fine-grained minerals. Due to the small particle size and large specific surface area, such fine-grained minerals are prone to coverage and surface adsorption competition effects during the flotation process, which significantly weakens the selective adsorption capacity of flotation reagents. Aiming at the problem of selective inhibition in the separation process of fine-grained hematite, a new K+ starch inhibitor was developed. Based on the flotation tests of pure minerals of quartz and hematite, combined with contact angle, Zeta potential, Fourier transform infrared spectroscopy and scanning electron microscopy (SEM)-EDS analysis, the inhibition mechanism of new K+ starch on fine-grained hematite was systematically revealed. The results showed that when the dosage of K+ starch was 150 mg·L-1, the dosage of activator CaO was 100 mg·L-1, and the dosage of collector sodium oleate was 200 mg·L-1, the recovery rate of quartz was 83.5%, which was 4.00 percentage points higher than that of traditional corn starch, while the recovery rate of hematite decreased to 15.85%. In the flotation of mixed magnetic concentrate, the concentrate grade and recovery rate obtained under the action of new K+starch were 7.28 percentage points and 5.30 percentage points higher than those of corn starch, respectively. The mechanism analysis showed that K+ starch combined with O2- to form K—O- bond when K+ starch adsorbed onto hematite surface, which reduced the contact angle of hematite surface to 22.31° and formed a hydrophilic film, thus realizing the selective inhibition of hematite. The research results provided the design concept and theoretical basis of new environmentally friendly inhibitors for the efficient separation of fine-grained hematite.
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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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