Interaction between typical anions/cations and structural differences in crystal structure of magnesite in flotation systems
Magnesite in nature mainly exists in two structures,crystalline and cryptocrystalline.The difference in crystal structure causes minerals to exhibit different surface properties,such as solubility and hydrophobicity,during the flotation process.In the flotation process,the commonly used anion and cation regulators will promote different interactions between the two crystalline structures magnesite and the collector,but the specific influence mechanism on the two crystal structures is not clear.In this paper,the effects of anions and cations,such as Fe3+,Ca2+,SiO32- and CO32-,on the floatability of two crystalline magnesites were studied under the action of dodecamine cation collector and sodium oleate anion collector.The results show that Fe3+has obvious inhibitory effect on minerals in dodecamine system,the recovery rates of crystalline magnesite and cryptocrystalline magnesite decrease by 70％and 10％,respectively.Ca2+,SiO32- and CO32- have certainly activating effects,among which CO32- has the strongest effect,and the recovery rates of two crystalline magnesites increases by 70％and 40％,respectively.In the sodium oleate system,Fe3+ and Ca2+ have inhibitory effects on the flotation of minerals,the recovery rates of the two minerals decreases by 55％and 20％,respectively,when Fe3+is reacted.Ca2+ and Mg2+ have the activating effect on the surface of minerals,and the recovery rates of crystalline and cryptocrystalline magnesite increase by 10％and 25％,respectively.The different crystalline structures of magnesite affect its flotation characteristics under ionic conditions.The addition of CO32- will promote the adsorption of sodium oleate on the surface of the mineral,thereby improve the recovery rates of the minerals.The addition of Fe3+ will promote the dissolution of magnesite and form a hydration layer on the surface of the particles,hinder the adsorption of collectors on the surface of the particles,thereby reduce the recovery rates of minerals.
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