首页|Recovery of scandium from silicate minerals by high-pressure leaching in sulfuric acid
Recovery of scandium from silicate minerals by high-pressure leaching in sulfuric acid
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This study investigated the leaching of scandium from a Sc-bearing silicate ore.The Sc concentrate obtained by beneficiation pre-enrichment has 1.03 × 10-4 wt％Sc and 14.66 wt％Fe.The main Sc-bearing minerals are limonite,chlorite,sericite,and hornblende,in the form of isomorphism.High-pressure leaching(HPL)with sulfuric acid(98 wt％)and NaF was used to dispose this samples.The Sc leaching efficiency of 91.82％was obtained under the optimum conditions,which are pressure of 5.0 × 105 Pa,A/O value of 1.1,L/S value of 1.8,NaF dosage of 2 wt％,at 130 ℃ for 6 h.The X-ray diffraction(XRD)and scanning electron microscopy(SEM)results show that the residue is mainly quartz phase in the multi-hole shape.Compared with ordinary leaching for silicate,high-pressure leaching has significant ad-vantages in saving acid and energy consumption.
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