Abstract
The delamination of montmorillonite in water leads to sliming in ore slurry, which is detrimental to mineral flotation and solid/water separation. In this work, the delamination of Na-montmorillonite (Na-MMT) has been restrained by sodium dodecyl sulfate (SDS) or octadecyl trimethyl ammonium chloride (1831) through the adsorption on the edge of the mineral. The experimental results have shown that the pretreatment by adding SDS and 1831 could greatly reduce the Stokes size percentage of −1.1 µm particles in the aqueous Na-MMT suspension. From the X-ray diffractometer (XRD) results, the interlayer spacing of the MMT pre-treated by SDS and 1831 is smaller than that of original MMT particles. Adsorption position of SDS and 1831 on MMT surfaces was analyzed by the measurements of adsorption capacity of SDS and 1831, inductively-coupled plasma spectra, and zeta potential before and after the plane surface of MMT was covered with tetraethylenepentaminecopper ([Cu(tetren)]2+). The results indicated that SDS and 1831 are adsorbed on the edge and the whole surface of Na-MMT, respectively. Delamination of MMT could be well restrained by the adsorption of SDS and 1831 on the edges of MMT.
Highlights
Na-montmorillonite (Na-MMT) is one kind of 2:1 phyllosilicates with the exchangeable Na+cation adsorbed in the interlayer space close to the tetrahedral basal oxygen atoms [1]
Na-MMT particle is immersed in water, the interlayer of MMT will be hydrated
These findings are in good agreement with quasi-elastic neutron scattering (QENS)
Summary
Na-montmorillonite (Na-MMT) is one kind of 2:1 phyllosilicates with the exchangeable Na+. The delamination of MMT appears in many separation processes, such as hydrometallurgy, with separation water molecules and the interlayer space is expanded, the Na-MMT can be exfoliated magnetic and solid-water separation [7,8]. 3(CH2)11SO4Na. Octadecyl trimethyl ammonium chloride (1831) is a edge surface before immersion of Na-MMT in water, in order to reverse the hydrophilic edge cationic surfactant with the formula C21H46NCl. In this work, SDS and 1831 was pre-adsorbed onto surface to hydrophobic, thereby, preventing water adsorption in the interlayer space and to prevent the edge surface before immersion of Na-MMT in water, in order to reverse the hydrophilic edge. Surfactant adsorption surface to hydrophobic, thereby, preventing water adsorption in the interlayer space and to prevent on MMT would notdelaminating bring any problem hydrometallurgy, Na-MMT from to super for fineseparation particles in in water. Which ([Cu(tetren)]2+) can pre-block the structural charges of MMT
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