微粒嵌布难选金红石矿煤基深度还原热力学  

Coal-based deep reduction thermodynamics of micro-inlaid unsortable rutile ore

作　　者：赵凯 王彬 张巧荣 纪海健 白丽梅 师学峰 ZHAO Kai;WANG Bin;ZHANG Qiao-rong;JI Hai-jian;BAI Li-mei;SHI Xue-feng(College of Metallurgy and Energy,North China University of Science and Technology,Tangshan 063210,Heibei,China;Taishan Steel,Laiwu 271100,Shandong,China)

机构地区：[1]华北理工大学冶金与能源学院,河北唐山063210 [2]泰钢集团,山东莱芜271100

出　　处：《钢铁研究学报》2020年第4期289-296,共8页Journal of Iron and Steel Research

基　　金：国家重点研发计划资助项目(2017YFB0603800,2017YFB0603802)。

摘　　要：岩矿型金红石矿作为一种典型的含钛资源,其具有矿物粒度极细,矿物成分复杂,矿相结构相互嵌布的特点。金红石矿中TiO2常与铁氧化物和脉石伴生共存,从而导致铁、钛和硅的分离很难通过传统的加工方法实现。为将TiO2与矿物中其他组分有效分离,提出了煤基深度还原法处理金红石矿。首先基于FactSage热力学软件计算确定煤基深度还原金红石矿的可行性,其次通过分析平衡产物组成,揭示配碳比nC/nO(还原用煤粉中固定碳与铁氧化物中氧的物质的量比)、KOH和K2CO3添加量对铁和钛回收率的影响。结果表明:随nC/nO的升高,铁收得率随之升高,nC/nO为1.2时达到峰值97.97%,添加K2CO3或KOH均对金红石原矿中的钛铁分离有促进作用。为保证TiO2的高效回收,优化工艺参数为焙烧温度1200℃,配碳比1.2,K2CO3添加量为20%或KOH添加量为15%(质量分数)。As a typical type of titanium-bearing resource,rock-mineral rutile ores exhibit fine mineral crystal size,complicated phase structure,and complex mineral components and interfacial mineral structure intercalation.The valuable TiO2 often coexists with iron oxides and gangue which results in the separation of iron,titanium and silicon is difficult by traditional processing methods.In order to separate titanium from other phases in rutile ore efficiently,the coal-based deep reduction process was proposed to treat rutile ore.Thermodynamic calculations were conducted by FactSage to evaluate the feasibility of deep coal-based reduction and acquire the reduction equilibrium products.Then,the effects of nC/nO,K2CO3 and KOH addition on the separation of iron and titanium were investigated systematically.The thermodynamic calculation results show that the iron and titanium could be separated effectively with nC/nO of 1.2 and a roasting temperature of 1200℃.Also,the addition of 20 mass%K2CO3 or 15 mass%KOH could promote the separation of iron and titanium in rutile ore.

关 键 词：金红石矿 深度还原 配碳比 KOH K2CO3 

分 类 号：TD952[矿业工程—选矿] TD92