硫酸浸取钛铁矿动力学研究

Leaching Kinetics of Ilmenite in Sulfuric Acid Solution

以攀枝花钛铁矿、硫酸为原料,研究了钛铁矿在硫酸中浸取的反应动力学行为,并利用扫描电镜、矿物分析仪及X射线衍射仪对钛铁矿和浸取残渣进行了表征。研究结果表明:反应温度83~111℃,反应酸浓度23.5%~45.8%,酸矿比为6.2∶1,钛铁矿在硫酸中浸取反应模型为未反应收缩核模型,浸取速率控制步骤为混合控制,反应活化能为62.2 k J/mol;钛铁矿部分以单独物相存在,部分与其它物相夹杂;钛铁矿酸浸后,少部分钛铁矿物外表面比较规整,大部分钛铁矿物外表面为蜂窝状;钛铁矿主要物相为钛铁矿,酸浸取后增加了灰石物相和石英物相。

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.