Study on the change of main mineral phase in the pre-oxidation process of low calcium and high magnesium titanium concentrate
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针对攀西地区钛精矿的低钙高镁问题,本文采用补充空气和不补充空气两种方式对其进行预氧化焙烧,利用MLA矿物分析系统对不同焙烧温度、焙烧时间和氛围的钛精矿焙烧产物进行矿物组成、显微结构嵌布特征等分析,并在此基础上对物料特性进行讨论.结果表明,在不补充空气条件下,钛精矿中的磁铁矿氧化成赤铁矿,并与未氧化的钛铁矿固溶形成钛赤铁矿,具备固溶体分离结构.随着焙烧温度升高,钛铁矿的连生体矿物比例增加,单体比例减小,解离度变差.在补充空气条件下,先结晶生成的金红石呈他形,颗粒尺寸约6 μm;后结晶生成的铁板钛矿呈自形与半自形,颗粒尺寸约10 μm.铁板钛矿包裹金红石等矿物颗粒,具备粒状嵌晶结构,其解离效果差.钛精矿经氧化焙烧后,矿物间形成的晶界、孔洞改善了其冶金动力学及热力学条件.相比之下,补充空气氧化比不补充空气氧化效果好,适宜的氧化焙烧参数为焙烧温度1 200 ℃、保温时间80 min.
Aiming at the problem of low calcium and high magnesium in titanium concentrate in Panxi area,this paper uses air supplement and no air supplement to pre-oxidize the titanium concentrate.The mineral composition and microstructure of the roasting products of titanium concentrate with different roasting temperature,roasting time and atmosphere were analyzed by MLA mineral analysis system,and the material characteristics were discussed on this basis.The results show that under the condition of no air supplement,the magnetite in the titanium concentrate is oxidized to hematite,which is dissolved with the unoxidizedilmenite to form titanium hematite,which has a solid solution separation structure.With the increase of roasting temperature,the proportion of intergrowth minerals of ilmenite increases,the proportion of monomer decreases,and the degree of dissociation becomes worse.Under the condition of adding air,the rutile formed by the first crystallization is in his shape,and the particle size is about 6μm.The iron-brookite formed by post-crystallization is self-shaped and semi-self-shaped,and the particle size is about 10 μm.Iron brookite encapsulates mineral particles such as rutile,with granular embedded crystal structure,and its dissociation effect is poor.After the oxidation roasting of titanium concentrate,the grain boundaries and pores formed between the minerals improve the metallurgical kinetics and thermodynamic conditions.In contrast,the effect of supplementary air oxidation is better than that of non-supplementary air oxidation.The suitable oxidation roasting parameters are roasting temperature of 1 200 ℃ and holding time of 80 min.
Panxi titanium concentratelow calcium and high magnesiumoxidation roastingmineral analysisphase transitionembedding featuresmaterial properties
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