摘要:
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。
关键词:
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钛铁矿 /
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酸解 /
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球磨 /
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液相 /
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TiO2
Abstract:
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.
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