摘要:
氧化焙烧能够有效脱除钛铁矿中的有害元素S。对攀枝花钛铁矿中S元素的存在形式、氧化脱硫的工艺条件和脱硫机理进行了详细地研究。结果表明,攀枝花钛铁矿中大部分S以FeS形式存在,少量S固溶在FeTiO3和硅酸盐相中。在氧化焙烧过程中,钛铁矿中的FeS首先被脱除,然后才是固溶S被脱除。当氧化温度在650~750℃时,氧化焙烧仅发生FeS的脱除,脱硫反应速率快,钛铁矿脱硫率最高为85%~87%。固溶S的脱除需要更高的焙烧温度,且反应速率相对较慢。当氧化温度升至950~1 050℃时,钛铁矿经过60 min焙烧,即可脱除大部分FeS和固溶S,脱硫率达到96%~98%。
Abstract:
The oxidation roasting can effectively remove the harmful element S of the ilmenite.In this work,the existence form of S element,process conditions of oxidative desulfurization and desulfurization mechanism for Panzhihua ilmenite were studied in detail.The results show that most of S for Panzhihua il-menite exists in the form of FeS and a small amount of S exists in the solid solutions of FeTiO3 and sili-cate.In the oxidation roasting process,FeS of ilmenite is first removed and then S existed in the solid so-lutions is removed.When the oxidation temperature is between 650 and 750℃,only FeS is removed in the oxidation process;the rate of desulfurization reaction is great and the highest desulfurization ratio of ilmenite is about 85%~87%.The removal of S existed in the solid solutions requires much higher roastingt emperature and its reaction rate is relatively slower.When the oxidation temperature reaches to 950~1 050℃,most of FeS and S existed in the solid solutions could be removed after ilmenite is roasted for 60 min and the desulfurization ratio reaches to 96%~98%.
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