【作者】 杨成洁；

【导师】 娄太平； 张力；

【作者基本信息】 东北大学 ， 化学工艺， 2008， 硕士

【摘要】 金红石是制取金属钛及钛白粉的重要原料。虽然钛铁矿精矿可以制备钛渣,但品位低,难以作为氯化法制备钛白的原料,需富集处理获得高品位的富钛料—高品位钛渣或人造金红石。为实现低品位高钛渣的富集与分离,东北大学提出了电炉钛渣改性处理金红石化的选择性分离技术。在前期改性实验过程中,实现了钛组分的选择性富集与长大。改性后仅含有两个钛矿物相：金红石,硅酸盐玻璃相(Ti02<5%),实现了富集。本课题以改性高钛渣(高钛渣：以钒钛磁铁精矿为原料,通过转底炉-电炉还原制备的高钛渣,35-50% Ti02)为原料,通过选矿分离方法,完成电炉钛渣金红石化的选择性分离技术的第三个环节—改性高钛渣中钛组分-金红石相的选择性分离。在重选抛尾实验中,确定最佳磨矿粒度为38μm,且通过重选改性高钛渣粗精矿Ti02品位由35.72%提高到56.55%。在粗精矿浮选实验中,以烷基羟肟酸钠为捕收剂,当硫酸用量1000g/t(pH=2.8),捕收剂用量800g/t,活化剂硝酸铅用量200g/t,抑制剂淀粉用量800g/t时,浮选精矿Ti02品位从56.55%提高到61.69%。在浮选精矿的常压酸浸出实验中,主要研究常压酸浸出过程的影响因素：酸浸剂、浸出时间、浸出温度、矿液比,并分析精矿经酸解过滤后滤液中钛的含量。实验结果表明,当用稀盐酸作为酸浸剂,浸出温度为65℃,浸出时间为3小时,矿液比为1：20时,酸浸效果最佳,其浸出后金红石精矿Ti02品位可高达96.56%。本研究根据改性钛渣的矿物组成相对简单,目的矿物与其硅酸盐矿物在比重上的差异更加明显,从而利用重选进行初步富集,然后通过浮选、常压酸浸出进行精选,即采用“重选—浮选—酸浸出”的联合工艺,有效地提高了改性钛渣的金红石品位,得到合格精矿(Ti02品位97.45%)。更多还原

【Abstract】 Although ilmenite concentration can be directly used as raw materials for titania slag, due to low grade, it is difficult that titania slag used as raw materials for chloride method. Hence it is necessary to obtain high-grade titanium slag or man-made rutile through metallurgy method. Northeastern University presented selective separation technology for making the low-grade modified titania slag to be rutile.During the process of modified experiments at the early time, the modification made Ti components selectively enrichment into rutile phase, which could be growth and coarsen. Modified slag only had two titanium minerals phase:rutile, silicate glass (TiO2<5%), and then achieved the enrichment.This subject uses the modified titanium slag as the raw materials (titania slag:vanadium and titanium magnetite concentrate for raw materials, through the rotary hearth furnace-electric furnace reduction of the titania slag,35-50% TiO2), processing through the mineral separation method, completed the third session of the selective separation technology for preparing rutile from electric furnace titanium slag.Throw ore tailing experiment during the gravity dressing is to determine the optimal size for the grinding 38μm. Through the gravity dressing of the modified titanium slag, the crude concentrate can be increased from 35.72 percent to 56.55 percent.In the flotation experiments of the crude concentrate, the alkyl hydroxamic sodium was employed as collector, when the amount of sulfate is 1000g/t(pH=2.8), collector 800g/t, activation of lead nitrate 200g/t, inhibitors of amylase 800g/t, the flotation concentrate grade of TiO2 from 56.55 percent to 61.69 percent.In the experiments of atmospheric acid leaching, the crude concentrate from gravity dressing, the effect factors on atmospheric acid leaching process were studied, such as acid leaching agent, leaching time, leaching temperature, the ratio of slag to acid, and analysising the content of titanium of the acid solution in the filter after filtrating. The results show that, when dilute hydrochloric acid as the acid leaching agent, leaching temperature of 65℃, leaching time of three hours, the ratio of slag to acid of 1:20, acid leaching effect was best, after leaching, the TiO2 grade in rutile concentrate can reach to 96.56 percent.Because the mineral phases in the modified slag is relatively simple, and the density difference between the tutile phase and silicate mineral phase is very obvious, gravity dressing is firstly used, and then concentrating through flotation and atmospheric acid leaching, that is to say, the j oint process of "gravity separation-flotation-acid leaching", can obtain eligible rutile concentrate (TiO2 concentrate 96.56 percent).更多还原