abstract

• In this study, the effects of calcium ions on the flotation of malachite with octyl hydroxamate collector has been investigated using micro-flotation, zeta potential, contact angle, adsorption, and particle size measurements. Although the adsorption amount of collector and the hydrophobicity of malachite surface were not influenced by the addition of 1 × 10−2 mol/L CaCl2 at the optimized flotation pH 9, it was found that the malachite flotation recovery was enhanced by the addition of CaCl2 in the pH range of 6–11. In the presence of CaCl2, energy barrier between the malachite particles and the bubbles were lower, leading to the aggregation of malachite particles, and the enhanced malachite recovery. However, at pH > 11, the formation of Ca(OH) and Ca(OH)2 species on malachite surface inhibited its flotation. © 2019 Elsevier Ltd
• In this study, the effects of calcium ions on the flotation of malachite with octyl hydroxamate collector has been investigated using micro-flotation, zeta potential, contact angle, adsorption, and particle size measurements. Although the adsorption amount of collector and the hydrophobicity of malachite surface were not influenced by the addition of 1 × 10−2 mol/L CaCl2 at the optimized flotation pH 9, it was found that the malachite flotation recovery was enhanced by the addition of CaCl2 in the pH range of 6–11. In the presence of CaCl2, energy barrier between the malachite particles and the bubbles were lower, leading to the aggregation of malachite particles, and the enhanced malachite recovery. However, at pH > 11, the formation of Ca(OH)%2b and Ca(OH)2 species on malachite surface inhibited its flotation. © 2019 Elsevier Ltd

authors

• Guo B.
• Li Z.
• López Valdivieso Alejandro
• Rao F.
• Song S.
• Zuo W.

publication date

• 2019-01-01

funding provided via

• Consejo Nacional de Ciencia y Tecnología, CONACYT: 270186  Grant
• Natural Science Foundation of Hubei Province: 2016CFA013  Grant
• Wuhan Municipal Science and Technology Bureau: 2016070204020156  Grant

published in

• Minerals Engineering  Journal

keywords

• Adsorption; Aggregation; Ca2 ions, Octyl hydroxamate; Malachite flotation Adsorption; Agglomeration; Calcium; Chlorine compounds; Contact angle; Flotation; Hydrated lime; Ions; Particle size; Adsorption amounts; Calcium ions; Flotation recovery; Hydroxamate; Particle size measurement; pH range; Carbonate minerals
• Adsorption; Aggregation; Ca2+ ions, Octyl hydroxamate; Malachite flotation Adsorption; Agglomeration; Calcium; Chlorine compounds; Contact angle; Flotation; Hydrated lime; Ions; Particle size; Adsorption amounts; Calcium ions; Flotation recovery; Hydroxamate; Particle size measurement; pH range; Carbonate minerals

Digital Object Identifier (DOI)

• 10.1016/j.mineng.2019.105854

start page

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volume

• 141