Leaching Kinetics of Ilmenite in Sulfuric Acid Solution

Using Panzhihua ilmenite and sulfuric acid as raw materials,the leaching kinetics of the ilmenite in sulfuric acid was studied,and the ilmenite coupled with the leaching residue was characterized by SEM,mineral analyzer and XRD.The research results show that at the reaction temperature of 83 ～ 111 ℃,the acid concentration of 23.5% ～ 45.8% and the acid-ore ratio of 6.2 ∶ 1,the leaching reaction is under the unreacted shrinking core model,with a mixed control step and 62.2 k J/mol of the activation energy.The ilmenite mainly exists as a separate phase or mixed state with other phases.Except for small part of ilmenite with a smooth surface,most of the ilmenite has a honeycombed surface,after the acid leaching.The ilmenite ore,primarily composed of ilmenite phase,has the limestone and quartz phases exposed after acid leaching.