Abstract
The effects and mechanism of magnetized kerosene on the flotation behaviors of molybdenite were studied by micro-flotation, ultraviolet spectrum, infrared spectrum, surface tension, and liquid viscosity. According to the results of micro-flotation, magnetized kerosene improved the flotation recovery of molybdenite, and the improvements were more obvious with smaller molybdenite particles. Spectral analysis showed that the magnetization did not change the chemical composition of kerosene, but transformed the linear aliphatic hydrocarbons in kerosene into linear isomers and reduced the lengths of the carbon chains. Moreover, the magnetization reduced the viscosity of kerosene and oil/water interfacial tension, and improved the dispersion of kerosene in the pulp. The external magnetic field transformed the disorder of the additional magnetic moment in the kerosene molecules into order, and reduced the compactness of the kerosene molecules. The experimental results provided a theoretical explanation for the role of magnetization in mineral flotation.
Highlights
Molybdenum is a rare metal with a high melting point, high strength, and high elastic coefficient
Nonpolar hydrocarbon oils are used as collectors to enhance the hydrophobicity of molybdenite faces, and the molybdenite’s flotation. since these oils are readily to adsorb on molybdenite faces through hydrophobic interactions and van der Waals forces
Magnetized kerosene improved the flotation recovery of molybdenite, and the improvement increased as the molybdenite particle size decreased
Summary
Molybdenum is a rare metal with a high melting point, high strength, and high elastic coefficient. As a strategic mineral resource, molybdenum is widely used in the fields of iron and steel, petroleum, chemical industry, electrical and electronic technology, medicine, and agriculture [1,2,3]. The flotation behaviors and differences in different particle size of molybdenite are worthy of in-depth study. The floatability of molybdenite particles depends on the relative surface exposure of hydrophobic faces and hydrophilic edges [9,12]. Nonpolar hydrocarbon oils are used as collectors to enhance the hydrophobicity of molybdenite faces, and the molybdenite’s flotation. Since these oils are readily to adsorb on molybdenite faces through hydrophobic interactions and van der Waals forces.
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