高铬型钒钛铁精矿球团氧化焙烧-盐酸浸出提钒  

Extraction of vanadium from high-chromium vanadium-bearing titanomagnetite pellets by oxidation roasting-HCl leaching process

作　　者：吴恩辉 李军 徐众 侯静 黄平 李宏 Wu Enhui;Li Jun;Xu Zhong;Hou Jing;Huang Ping;Li Hong(College of Vanadium and Titanium,Panzhihua University,Panzhihua 617000,Sichuan,China;Vanadium and Titanium Resources Comprehensive Utilization Key Laboratory of Sichuan Province,Panzhihua 617000,Sichuan,China)

机构地区：[1]攀枝花学院钒钛学院,四川攀枝花617000 [2]钒钛资源综合利用四川省重点实验室,四川攀枝花617000

出　　处：《钢铁钒钛》2022年第6期14-23,共10页Iron Steel Vanadium Titanium

基　　金：四川省科技计划项目资助(2020YFH0195);攀枝花市科技计划项目资助(2021CY-G-4)。

摘　　要：以高铬型钒钛铁精矿为原料,研究其在氧化焙烧-盐酸浸出过程中球团强度与钒浸出行为之间的相互关系。热力学分析结果表明,在氧化钙存在的条件下,高铬型钒钛铁精矿中主要化合物的氧化反应顺序依次为:FeTiO_(3)>Fe_(3)O_(4)>Fe_(2)SiO_(4)>FeV_(2)O_(4)>FeCr_(2)O_(4)。氧化产物物相分析结果证实,钛铁矿比磁铁矿更易氧化,氧化产物的主要物相为Fe_(2)O_(3)和Fe_(9)TiO_(15)。氧化温度和盐酸浓度分别是氧化过程和浸出过程中影响钒浸出率和浸出后球团强度的关键因素;浸出后球团强度与V_(2)O_(5)浸出率呈现较为明显的负相关关系;返烧可以有效提升浸出后球团强度,在返烧温度1200℃,返烧时间90 min条件下,返烧后球团强度大于3000 N/球。The relationship between crushing strength of pellets and leaching behaviors of vanadium in oxidation roasting-HCl leaching process from high-chromium vanadium-bearing titanomagnetite concentrates were investigated in this work.The results of the thermodynamic analysis of oxidizing roasting process show that the order of reaction of main compounds is:FeTiO_(3)>Fe_(3)O_(4)>Fe_(2)SiO_(4)>FeV_(2)O_(4)>FeCr_(2)O_(4).The phase analysis results of oxidation roasting process show that the oxidation reaction of the ilmenite is easier to magnetite,and the main phases of oxidation pellets are Fe_(2)O_(3)and Fe_(9)TiO_(15).Experimental results indicate that the oxidation temperature and HCl concentration are the key factors affecting the leaching efficiency of vanadium and the crushing strength of leached pellets in the oxidation process and leaching process respectively.There is an obvious negative correlation between the leaching efficiency of vanadium and the crushing strength of leached pellets.The crushing strength of leached pellets can be effectively increased by return roasting process.The crushing strength of pellets after return roasting is greater than 3000 N/pellet under the condition of roasting temperature of 1200℃for 90min,which can be used as raw materials for blast furnace ironmaking.

关 键 词：提钒 高铬型钒钛铁精矿 球团 氧化焙烧 盐酸 浸出 

分 类 号：TF841.3[冶金工程—有色金属冶金]