Roots Ilmenite Beneficiation Test And Mechanism Researc

Titanium is considered to be a rare metal because it is widely distributed and difficult to process using existing technology.The ilmenite currently presents microfine grained,poor fine heterogeneity,low sorting efficiency,and the embedded particle size of the ore becomes fine,making it difficult to recover useful minerals,which is the main problem in ilmenite beneficiation.In this study,the process mineralogy of ilmenite ore in Roots area of Yunnan Province was studied,and the magnetic-float process was proposed based on the process mineralogy.Optional exploration and condition tests were conducted on the raw ore（the conventional weak magnetic separation-strong magnetic separation pretreatment process was selected,which includes two processes of weak magnetic separation and strong magnetic separation by Slon high gradient magnetic separator）,and the influence of each condition on the index was studied and the related reasons were analyzed.The flotation selection test was conducted on ilmenite ore,and the specific chemical system was determined,using a new oxidant sodium chlorite acting on the surface of ilmenite ore,so that the elemental valence state on the surface of ilmenite ore changed,and Fe²⁺became Fe³⁺,thus improving the flotation recovery of ilmenite ore.Titanium-bearing minerals mainly include titanomagnetite,ilmenite and veinstone minerals,most of which are in independent form in ilmenite,and a few of which exist in titanomagnetite and veinstone minerals in a homogeneous form,with quartz,chlorite and pyroxene as the main veinstone minerals.Selection test results show that with the increase of the weak magnetic field strength to 0.1 T,the Fe grade and recovery reached the peak,at which time the Fe grade and recovery are 61.83%and 14.81%,at which time the Fe resources can be recovered as much as possible.Selected using flotation,flotation raw ore for strong magnetic titanium coarse concentrate,based on the flotation open circuit test,a coarse three concentrate a sweep flotation closed circuit test,the indicators are ideal,Ti O₂grade 45.83%,operating recovery of 69.67%.The results of the whole process test of magnetic separation-flotation of ilmenite showed that the final titanium concentrate with Ti O₂ grade 45.83%and 45.11%recovery was obtained.The mechanism tests proved that the recovery of ilmenite after sodium oleate activation in the sodium oleate system was substantially increased,and the highest recovery was 83.18%at p H 8.Under the influence of both sodium chlorite and sodium oleate,the zeta potential of ilmenite tended to be more negative than that of sodium oleate alone,and the adsorption of sodium oleate on ilmenite surface increased.Infrared Spectrum（FT-IR）and X-ray photoelectron spectroscopy（XPS）results showed that sodium chlorite produced a chemical reaction on ilmenite surface,and more Fe²⁺was converted to Fe³⁺,which made the adsorption of sodium oleate more solid.Both contact angle and Atomic force microscopy（AFM）confirmed that the activation of ilmenite by sodium chlorite significantly increased the active sites on the mineral surface,and the hydrophobic layer was thicker compared with that before the activation,which improved the floatability of ilmenite.