四川某锂辉石浸出渣工艺矿物学特征及磁选试验研究OA

With the rapid development of the global new energy industry,the demand for lithium resources has increased dramatically,resulting in an increasing stock of lithium slag.Magnetic separation has the dual functions of impurity removal and recovery in the treatment of lithium slag.The quality of lithium slag is improved by separating magnetic impurities,which creates good conditions for its high-value utilization in building materials,ceramics,metal-lurgy and other fields.In this paper,a typical lithium slag in Sichuan was taken as the research object,and its process mineralogy characteristics were analyzed by means of X-ray diffractometer(XRD),X-ray fluorescence spectrometer(XRF)and scanning electron microscope(SEM).On this basis,the magnetic separation iron removal process was studied.The results show that the lithium slag is mainly composed of SiO2 and Al2O3(accounting for 92.57%),and the iron impurities are weakly magnetic minerals in the coarse fraction(+0.025 mm),which are cemented with the aluminosilicate matrix.Through a magnetic separation(0.6 T)+high intensity magnetic separation(1.2 T)process,a silicon-aluminum powder product with a yield of 87.11%,a Fe2O3 grade of 0.33%,and a whiteness of 80.42%was obtained.The lithium slag particles are fine,disseminated iron impurities,and the occurrence form is complex.After magnetic separation,the Fe2O3 grade is reduced to 0.33%and it is difficult to further remove.The process realizes the efficient removal of iron impurities and the recovery of tantalum and niobium simultaneously,which provides a technical reference for the high-value utilization of lithium slag.