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Journal of Mining Sciences

2016 year, number 6

Impulse Energy Inputs to Modify Subsurface Structure and Functions and Process Properties of Calcium-Bearing Minerals

M. V. RYAZANTSEVA, I. ZH. BUNIN, E. V. KOPORULINA
Institute of Integrated Mineral Development-IPKON, Russian Academy of Sciences, Kryukovskii tupik 4, Moscow, 111020 Russia
Keywords: кальцит, флюорит, шеелит, высоковольтные наносекундные импульсы, метод кислотно-основных индикаторов Гаммета, рентгенолюминесценция, микроскопия, мономинеральная флотация, calcite, fluorite, scheelite, high-voltage nanosecond impulses, Hammett acid-base indicators, X-ray fluorescence, microscopy, mono-mineral fraction

Abstract

Using Hammett indicators, X-ray fluorescence spectroscopy and atomic force microscopy, the authors analyze influence of high-voltage nanosecond impulses on structure and chemistry of surface and on process properties of calcium-bearing minerals. As a result of impulse energy inputs for t ≤ 30 s, the change in the structure and functions of mineral surface includes: enhancement of electron-donor capacity and formation of structural defects on the surface of fluorite, and enhancement of acceptor capacity of the surface of calcite and scheelite. Pre-treatment of mono-mineral samples by electrical impulses increases flotation ability of calcium-bearing minerals: increment in froth recovery makes 10–12% for scheelite, 5–6% for fluorite and 7–8% for calcite.