攀枝花钛渣氧化焙烧试验研究

Experimental study on oxidative roasting of Panzhihua titanium slag

采用XRD、扫描电镜等检测方法对攀枝花钛渣进行深度分析,得出钛渣主要由铁黑钛石相和硅酸盐相组成。通过差热热重试验确定了氧化焙烧参数,完成了不同温度焙烧试验研究,并对氧化后钛渣进行了Raman、XRD、SEM分析。研究表明氧化焙烧过程中,攀枝花钛渣主要含钛物相依次发生低价钛氧化物-锐钛型TiO2-金红石转化,铁黑钛石相转化成金红石和板钛矿相,随着温度升高,氧化速度加快。在强氧化过程中,黑钛石固溶体产生了大量的细小孔洞和微裂纹,在850~1100℃区间内,氧化温度越高,形成的表面微裂纹及内部小孔洞越多,黑钛石固溶体晶格的破坏程度就越大。

The titanium slag of Panzhihua was analyzed by XRD and SEM.The results showed that the titanium slag mainly composed of ferro-biotite phase and silicate phase.The oxidation roasting parameters were determined by DTG,and the roasting experiments at different temperatures were carried out.Raman,XRD and SEM were used to analyze the oxidation modified titanium slag.The results show that low-valent titanium oxide-anatase titanium dioxide-rutile occurs successively in the main titanium-bearing phase of Panzhihua titanium slag during the roasting process,and ferro-biotite phase is transformed into rutile and slate phase,and the oxidation rate increases with the increase of temperature.In the process of strong oxidation,a large number of small holes and microcracks were produced in the solid solution of biotite.In the range of 850~1 100 ℃,the higher the oxidation temperature,the more surface microcracks and internal microcracks were formed,and the more destructive the lattice of biotite solid solution was.