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2 Physicochemical Problems of Mineral Processing

2 2022

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Experimental study on the effect of ions on the surface hydration characteristics of fine quartz

Liu Chunfu, Min Fanfei, Liu Lingyun, Chen Jun, Ren Bao, Lv Kai, Tan Yujiao

Physicochemical Problems of Mineral Processing

2022

Vol. 58, iss. 4

art. no. 150280

The fine quartz particle hydration and effects of metal ions on the hydration characteristics of fine quartz surface are investigated using the rheological experiment. Several important factors affecting hydration factors, such as particle sphericity, solution pH, ion species, ion concentration were investigated. The results show that viscosity and hydration factor of fine quartz suspension increase with the increase of solution pH. wherein quartz particles have more negative charges on the surface in alkaline environment and strong hydration repulsion; The introduction of metal ions enhances the hydration strength of fine quartz surface to a certain extent. In contrast, high valence and high concentration will increase the viscosity of fine quartz suspension, and the hydration factors of particle surface also increase. At the same ion concentration, the order of influence on the hydration factors of fine quartz particles is Mg2+ > Ca2+ > Na+ > K+. This finding has been attributed to the combination of metal ion hydration and its adsorption on the mineral surface. This study will provide the theoretical guiding significance for the refractory coal slime water and other mineral processing wastewater containing quartz particles.

Effect of Na+, Ca2+ on the hydration properties of quartz surface: a molecular dynamics simulation study

Liu Chunfu, Min Fan-fei, Chen Jun, Liu Ling-yun, Ren Bao, Lv Kai

Physicochemical Problems of Mineral Processing

2022

Vol. 58, iss. 3

art. no. 147452

Effects of metal ions on the surface hydration of fine quartz are investigated by the theoretical methodologies. The hydration layer on the quartz surface is made up of three layers of water molecules, about 8-10 Å. The interaction energy of ions changes from -1.071 eV in water to -1.821 eV (Na+) and -1.896 eV (Ca2+) when ions are present. Metal ions improve the interaction of water molecules with the quartz surface, allowing more water molecules to enter the second and third hydration layers. In the presence of Na+, the diffusivity of water molecules is greater than in Ca2+ solutions. Increased interaction between water molecules and surfaces in the order Ca2+ > Na+ is consistent with metal ions’ propensity to hydrate.