氢气协同生物质还原钒钛磁铁矿试验研究

Experimental study on reduction of vanadium-titanium magnetite with hydrogen and biomass

针对钒钛磁铁矿所含元素较多、结构较为复杂且铁钛紧密共生等特殊的物化性质以及充分综合利用难度较大的问题,研究了高温下钒钛磁铁矿与Na_(2)CO_(3)反应之后其物相的变化,讨论了温度以及生物质木屑对还原产物金属化率的影响。结果表明,Na_(2)CO_(3)的加入可促进钒钛磁铁矿与H_(2)反应,降低H_(2)还原钒钛磁铁矿中铁钛氧化物的难度;H_(2)还原钒钛磁铁矿时,升高温度和在钒钛磁铁矿中加入生物质木屑均对还原有利。在加热温度为1100℃时,钒钛磁铁矿金属化率可达80.22%,相同条件下加入生物质木屑可使还原产物的金属化率提升至84.47%。采用H_(2)还原钒钛磁铁矿的同时加入生物质木屑,有望实现铁的高效富集。

Vanadium-titanium magnetite has its unique characteristics like containing many valuable elements,complex phase structure and close intergrowth of iron and titanium,as well as the difficulty of full comprehensive utilization.In this paper,the phase change of vanadium-titanium magnetite reacted with Na_(2)CO_(3)at high temperature were studied,and the influence of temperature and biomass sawdust on the metallization rate of the reduction product was discussed.The results show that the addition of Na_(2)CO_(3)can promote reaction of vanadium-titanium magnetite with H_(2)and favour reducing the iron-titanium oxide in vanadium-titanium magnetite with H_(2).Increasing the temperature and addition of biomass sawdust both are beneficial to reduction of vanadium-titanium magnetite by H_(2).The is.When the reducing temperature is 1100℃,the metallization rate of vanadium-titanium magnetite can reach 80.22%,and the metallization rate can be increased to 84.47%by adding biomass sawdust under same conditions.The use of H_(2)to reduce vanadium-titanium magnetite while adding biomass sawdust is expected to achieve high-efficiency enrichment of iron.