Several Cationic Flotation Study Of Anti-oxidized Iron Ore Flotation Performance

This dissertation was supported by the National Basic Research Program of China "Molecular Assembly and Synthesis of Efficient Flotation Collector for Refractory Ore". Due to the character in most of the iron oxide in China, some types of surfactants were used as collectors for hematite and magnetite reverse flotation in order to search an efficient collector, and the related mechanisms were investigated at the end of article.The flotation behavior of magnetite, hematite and quart was investigated through the pure mineral flotation experiments by using dodecylamine, tetradecylamine, octadecylamine, Gemini cationic surfactant and silicone cationic surfactant as collector. For the separation of quartz and hematite, Gemini cationic collector 31527 have a got better effect, when the collector concentration is 0.5×10-4mol/L and pH is about 7, the recovery rate hematite is as high as 99.0% while quartz is 0.3% in the flotation tank. For the separation of quartz and hematite, Gemini cationic collector 31503 have a got better effect, when the collector concentration is 0.25×10-4mol/L and pH is about 7, the recovery rate magnetite is as high as 93.4% while quartz is 0.3% in the flotation tank. For the three aliphatic amines, in the low-concentration cases, the length of hydrocarbon chain is longer the collector capacity is weaker. When putting the starch into the two systems of quartz-hematite and quartz-magnetite, the inhibition of starch for the iron ore was not obvious as the two Gemini collectors had shown enough selectivity.Artificial mixed mineral test results show that, the separation effects of the two mineral systems were not satisfactory for the independent use of Gemini collector. When adding starch as inhibitors and Gemini 31503 as collector, the magnetite concentrate grade came to 70.92% with recovery 98.14%. Similarly, when adding starch as inhibitors and Gemini 31527 as collector, the hematite concentrate grade came to 67.78% with recovery 77.21%. Mechanism analysis shows that, the adsorption of Gemini cationic surfactant on the surface of hematite, magnetite and quartz is mainly physical adsorption. And Gemini cationic surfactants preferential adsorption on the quartz surface can significantly change its zeta potential. The adsorption of Gemini cationic surfactants on the surface of magnetite and hematite changes the surface zeta potential correspondingly less, thus widening the difference of the hydrophobic between the mineral surfaces.