The Influence Of Ions And The Evolution Of Surface Properties In The Separation And Flotation Of Plagioclase And Albite

As an important petrogenic mineral,feldspar widely exists in familiar mineral deposits.As the most widely distributed feldspar,potassium feldspar and albite can be found as separate feldspar mineral and gangue in metal mine.The ratio of K₂O and Na₂O represents a clear requirement in many industries,while some feldspar mines fail to meet it.Meanwhile,potassium feldspar and albite are the valuable mineral and gangue mineral in the recovery of metallic minerals?such as rubidium?,and they should be separated.The study on the flotation behavior and surface properties of microcline and albite is required not only in the flotation of metal ore,but also the improvement of feldspar.This study helps to enhance the understanding of feldspar gangue in metal ore,optimize the separation of feldspar gangue.Moreover,it helps to deepen the understanding of the flotation separation between different feldspars,and provides new ideas to adjust the content and proportion of K₂O and Na₂O in feldspar products.As a kind of potassium feldspar,the microcline has the same spatial group?C₁ⁱ-PT?as albite,and it is a representative mineral in the separation of potassium feldspar and albite.Microcline and albite are applied as research objects in this study.The surface properties and flotation behavior of microcline and albite influenced by ions are systematically studied using the quantum chemical calculation,instrumental analysis,and flotation experiment.The research results are described as follows:1.The atomic offsets and state density characteristics of atoms on the surface of microcline and albite are studied after optimizing the crystal parameters and?001?surface via the quantum chemical calculation.The flotation behavior of microcline and albite are studied,respectively,and their flotation difference indicates the influence of ore surface properties.The analysis results of infrared spectrum and XPS reveal that diverse adsorption characteristics of dodecylamine were detected on the microcline surface.2.Ions used in this research were determined by leaching microcline and albite,and the relationship between the ion concentration and ion activity in the solution was determined through the solution chemical calculation.The adsorption characteristics of ions on the surface of microcline and albite were fitted by an adsorption equation.In addition,the adsorption of hydrated cation groups on the surface of microcline and albite was determined.3.The flotation behavior of microcline and albite at different ion concentrations was investigated by the flotation experiment.Under the condition of 10 mg/L of dodecylamine,the recovery rate of microcline and albite were 87.7%and 81.4%,respectively,with a difference of 6.3%.Their recovery difference was significantly increased by adding Cu²⁺?Zn²⁺and Pb²⁺,and the difference can achieve 20.8%at a solution containing 0.026 mol/L of Cu²⁺.By comparing the equation fitting results of the ion activity and ion adsorption,it can be speculated that the ratio of positive charges and–OH in hydrating cation groups and their adsorption on the mineral surface can greatly resulted in the flotation difference.4.The change of surface properties after adding ions and dodecylamine is systematically analyzed by the infrared spectrum and XPS.In addition,the reactivity difference of Al and Si atoms on the surface of microcline and albite is determined by comparing the changes in the infrared wavelength,atom concentration and valence state.After adding ions,N1s on the surface of microcline and albite tends to converge.