热酸球磨浸出攀枝花钛铁矿

Sulfuric Acid Dissolution of Panzhihua Ilmenite Under Simultaneous Milling

在工业矿酸比条件下,研究攀枝花钛铁矿热酸球磨快速浸出的可行性,着重考察了搅拌球磨的转速、球料比、硫酸浓度以及反应温度等因素对酸解的影响。结果表明,与未实施球磨的浸出相比(其它试验条件相同、磨浸60 min),钛的浸出率可提高64%,这是由于搅拌球磨导致钛铁矿晶格畸变以及颗粒显著细化所致。获得了磨浸的优化工艺条件为:搅拌磨的转速700 r/min,球料比5∶1,矿酸比1∶1.6,硫酸浓度70%以及温度120℃。在此条件下磨浸60 min钛的酸解率达到81%,所得钛液稳定性≥550 mL,表明70%硫酸可直接液相酸解钛铁矿,为实现水解废酸循环利用提供了一条可行途径。

The feasibility of rapid leaching of Panzhihua ilmenite in sulfuric acid through combined milling under industrially employed acid/ore mass ratio was investigated.The effects of the stirring speed of attritor,milling ball /ore mass ratio,reaction temperature and sulfuric acid concentration on the dissolution were examined.The results show that with the simultaneous milling and dissolution the 1 h Ti leaching rate was 64% higher than that without milling under the otherwise same conditions due to lattice deformation and noticeably refined particles resulted from the milling.Optimized leaching conditions were obtained as follows： stirring speed at 700 r/min,ball /ore ratio at 5∶ 1,acid/ore ratio at 1∶ 1.6,sulfuric acid concentration at 70% and temperature at 120 ℃.Under these conditions,a titanium leaching rate of 81% was reached in 60 min and the stability of the titanyl sulfate solution thus obtained was higher than 550 mL.Therefore,direct digestion of ilmenite in 70% of sulphuric acid solution is feasible,which can fully reuse the hydrolyzed waste sulfuric acid discharged in the sulfate pigment production.