酸解残渣回收矿的酸解性能研究

Study on the acidolysis properties of titanium ore recovered from acidolysis residue

以酸解残渣中通过磁选获得的磁选回收矿为原料,使用化学分析、XRD、SEM、岩相分析等手段对比了磁选回收矿与常规钛精矿在化学成分、物相结构、钛元素赋存状态等方面的差异,在此基础上,进行了酸解对比试验。结果表明:磁选回收矿TiO_(2)品位约为38%,较钛精矿低约10%,其主要物相为钛铁矿约占65%,其次为石英和硅酸盐相,钛元素主要赋存于钛铁矿中约占87%。磁选回收矿粒度较小、表面有较多裂纹,单独酸解具有较好的酸解性能,但由于品位较低,其酸解钛液浓度偏低,不利于后期浓缩;磁选回收矿可与攀枝花PT20矿进行混合酸解,对酸解率无不良影响,添加比例在10%~15%时酸解率和过滤速度综合效果最佳,但是磁选回收矿和含镁较高的白马20矿混合酸解时,较高镁含量导致钛液比重增大,含硅絮凝物不易沉降,过滤速度慢。

Using the titanium ore recovered from the acidolysis residue and the conventional titanium concentrate as raw materials,the differences in chemical compositions,phase structures and occurrence states of titanium between the materials were analyzed and compared by chemical analysis,XRD,SEM and lithofacies analyses.Based on the analyses,the acidolysis experiments were carried out.The results show that the grade of TiO_(2) in the recovered ore is about 38%,10%lower than that in the conventional titanium concentrate.The main phase is ilmenite accounting for about 65%,followed by quartz and silicate phases.Titanium mainly occurs in ilmenite,accounting for about 87%.The recovered ore has better acidolysis performance because of its smaller particle size and more cracks on the surface.However,the titanium concentration of acidolysis solution is lower due to the lower grade of the recovered ore,which is not conducive to the latter concentration.The recovered ore can be mixed with Panzhihua PT20 ore for acidolysis,which has no adverse effect on the acidolysis rate.At the addition ratio of 10%~15%,the comprehensive effects of acidolysis rate and filtration speed are the best.However,when the recovered ore is mixed with Baima 20 ore for acidolysis,the higher magnesium content in Baima 20 ore leads to the increase of titanium liquid density,and the silica-containing flocs are not easy to settle and the filtration speed is slow.