Effect of Fe3+on dispersion behavior of fine smithsonite and calcite
The cover of calcite slime and the presence of high-valent metal cations were the challenges in the sorting effect of fine-grained smithsonite with particle size of-20 μm.Both of them deteriorated the dispersion and sorting environment of the smithsonite by changing its surface properties.In this paper,the common metal cation ion(iron ion)in smithsonite was selected as the object of study.The pattern and form of action of iron ion on the dispersion behavior of smithsonite and calcite were investigated by adsorption test,zeta potential,XPS analysis,and DLVO theoretical calculation.The results show that the adsorption behavior of both minerals for iron ions is basically the same.However,the effect of iron ions on the dispersion behavior of smithsonite is greater than calcite.The dispersion behavior of smithsonite is destroyed when the concentration of iron ions is 5×10-4 mol/L.The solution chemical analysis and DLVO theoretical calculations indicate that the adsorption of iron ions on the mineral surface form hydroxyl complexes or Fe(OH)3 leading to a smaller inter-particle interaction force of smithsonite than calcite.This is the main reason why iron ions disrupt the dispersion behavior of smithsonite and deteriorate the sorting of fine-grained smithsonite with particle size of-20 μm.
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