ISSN 1062-7391, Journal of Mining Science, 2017, Vol. 53, No. 5, pp. 897–906. © Pleiades Publishing, Ltd., 2017.
Original Russian Text © V.A. Ignatkina, 2017, published in Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, 2017, No. 5, pp. 113–122.
__________________________________ MINERAL _________________________________
Experimental Investigation of Change in the Contrast
between Flotation Properties of Calcic Minerals
V. A . I g n a t k i n a
National University of Science and Technology–MISIS, Moscow, 119049 Russia
Received August 30, 2017
Abstract—The interaction of fatty acid sodium oleate collector and higher isoalcohols in a liquid phase and
on surface of separated scheelite and calcite minerals is investigated. The research findings on monophase
calcite and scheelite are presented with their X-ray patterns and IR spectra. The experimental data show the
contribution of the intermolecular interactions in combinations of differently ionizable oxyhydryl collectors
to the increased contrast between floatabilities of scheelite and calcite. The IR spectroscopy states that the
maximum strength of the intermolecular hydrogen bridges between oleate and isoalcohols in the range of
fits with the molar ratio of 2. Isoalcohols in the surface layer of scheelite neutralize hydrophilic
behavior of oleate micellas by means of generation of heteromolecular associates through hydrogen bridges,
loosen the hydrated layer and enhance air bubble attachability; adhesion of isoalcohol drops improves
floatability of scheelite; higher isoalcohols reduce flotation activity of calcite. The maximum contrast in
flotation properties is observed in slimes at respective oleate concentrations fitting the micelle formation process.
Keywords: Flotation, calcite, scheelite, contrast, combination of collectors, wettability, micelle formation,
The problem to produce high-grade concentrates at a wanted recovery from ores bearing a few
calcium minerals is still ranked as a hot one. The enhanced contrast in process properties of flotation-
size minerals can be gained by applying selective reagent modes [1–4]. The performance of energy
effects, let, electroimpulse monomineral pretreatment aimed to improve the contrast in flotation
properties between calcite, scheelite, and fluorite is not so good as compared to that for sulfide and
precious mineral associations. By the evidence reported in , the increments to the recovery in a
froth product were 10–12% for scheelite, 5–6% for fluorite, and 7–8% for calcite.
The heavy-medium and radiometric pretreatment aimed at rejection of rock minerals to dump
tailings at the head of the dressing process appears rather efficient at laboratory and large-scale
laboratory research levels, though introduction of this process at operating ore preparation plants
claims considerable capital investments [6, 7].
There are two approaches to the development of selective reagent modes to float nonsulfide ores
containing salt-like minerals:
— reagent modes based on different-molecular structure collectors [8–11];
— reagent modes with application of different depressors, like liquid glass, including liquid glass
modified with cations of polyvalent metals, calcium chloride, with concurrent steaming after
Petrov’s procedure; derivatives of vegetal materials, for example, starch, tannin, polyphosphates,
etc. [2, 6, 12, 13].
In [14, 15] it is demonstrated that combination of sodium oleate and higher fatty isoalcohols is
capable to modify attachment of sodium oleate at scheelite and calcite surface. This specific feature
enables to suppress flotation activity of calcite at a recleaning stage under more soft steaming