钒钛磁铁矿利用新工艺的理论分析

Theoretical Analysis on Use of V-Ti Magnetite in a New Route

通过热力学分析,探讨钠化-碳热还原一步法处理钒钛磁铁矿实现资源综合回收的可行性,基于计算结果,提出了合理的工艺路线,并针对钒、钛产品品质的提高提出了相应的措施。分析结果表明,在850~1 155℃的温度范围内进行钠碱反应—低于1 400℃的温度下进行深度还原处理钒钛磁铁矿的新工艺是合理的。同时,钠化剂的加入在热力学上有利于铁矿物的还原,碳的存在促进了钠化反应的发生。通过调整铝硅比可以降低浸出液的杂质含量,大幅提高钒、钛产品的品质,如何实现钒、钛分离是今后努力的方向。采取Na OH溶液与Na HCO3双循环工艺,可以避免蒸发浓缩过程,大幅度降低了能耗。

The feasibility of resources comprehensive recycling from V-Ti magnetite by sodium alkali reaction and carbothermic reduction in one-step was discussed through thermodynamics analysis. Based on the calculation,rational process route was proposed,and corresponding measurements were put forward to improve the product qualities of vanadium and titanium. The calculation results show that,the treatment of V-Ti magnetite by sodium alkali reaction in range of 850 ~ 1 155 ℃ and deep reduction below 1 400 ℃is rational. Meanwhile,the addition of sodium salt is favorable for the reduction of iron bearing minerals,and the carbon enhances the sodium reaction. The impurity content in leaching liquid decreases and the quality of V-Ti product is improved greatly via controlling the ratio of aluminum to silicon,and how to realize the separation between vanadium and titanium is the direction of future efforts. When the sodium agent is cycled in the form of Na OH solution and Na HCO3,the evaporation process is avoided,and the energy consumption can be greatly reduced.