Abstract
In the process of industrial flotation separation, new low-TiO2 ilmenite with higher floatability than common ilmenite would reduce the TiO2 grade of the final concentrate. It was verified that sulfuric acid pretreatment could improve the floatability of common ilmenite. In this work, the sulfuric acid pretreatment was discovered to decrease the floatability of new low-TiO2 ilmenite. The results of zeta potential and contact angle analyses presented that the NaOL adsorption and the surface hydrophobicity of low-TiO2 ilmenite decreased compared to those without acid surface pretreatment. X-ray photoelectron spectroscopy (XPS) and atomic force microscopy imaging (AFM) analyses further indicated that after acid surface pretreatment, the total contents and activity including Fe, Ca, and Mg active sites on low-TiO2 ilmenite surfaces were less than those of untreated ilmenite even if Ti became the new site. These changes were responsible for the reduction in the adsorption of NaOL and flotation recovery of low-TiO2 ilmenite. Therefore, the acid surface pretreatment has an inhibiting effect on the new low-TiO2 ilmenite against common ilmenite.
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