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首页> 外文期刊>Metallurgical Research & Technology >Influence of alkaline additives on main minerals in Baotou rare earth tailings in the process of coal-based magnetizing roasting
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Influence of alkaline additives on main minerals in Baotou rare earth tailings in the process of coal-based magnetizing roasting

机译：碱性添加剂对包头稀土尾矿主要矿物质在煤基磁化焙烧过程中的影响

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摘要

The influence of NaOH-Ca(OH)(2) on magnetizing roasting of iron minerals and on the decomposition reactions of rare earth minerals during coal-based magnetizing roasting is explored in the present work. The effect of alkaline additives was determined by means of SEM-EDS and X-ray diffraction methods in NaOH-Ca (OH)(2)-coal-tailings mixtures under optimal magnetizing roasting conditions (mass ratio of NaOH, Ca(OH)(2), coal and tailings equal to 2.5: 4.5: 2.5: 100, roasting at 650 degrees C for 2.5 h). Although NaOH results in an adverse impact on magnetizing roasting of hematite, iron in silicate minerals could be released by NaOH-Ca(OH)(2) additive as a form of hematite, which is further reduced to ferromagnetic magnetite. Moreover, the reduction ability of gas is improved in presence of coal and water from decomposition reaction of Ca(OH)(2). Regarding the decomposition of bastanasite, no evident effect of NaOH-Ca(OH)(2) is observed. The roasted products of pristine bastnasite particles are mainly composed of rare earth oxides (REO) with little fluorine, independent on the use of alkaline additives. No high purity REO were determined in the monazite particle by SEM-EDS, which is mainly decomposed into REO and REFeO3.
机译：NaOH-Ca（OH）（2）对铁矿物磁化烘烤的影响及对稀土矿物质在稀土矿化过程中的分解反应的影响在本工作中探讨。碱性添加剂的效果通过在最佳磁化焙烧条件下的NaOH-Ca（OH）（2）颗尾部混合物中的SEM-EDS和X射线衍射方法测定（2）块尾矿混合物（NaOH，Ca的质量比（OH）（ 2），煤和尾矿等于2.5：4.5：2.5：100，烘烤650℃，持续2.5小时）。虽然NaOH导致对赤铁矿磁化烘烤的不利影响，但是硅酸盐矿物中的铁可以通过NaOH-Ca（OH）（2）添加剂作为赤铁矿形式释放，其进一步减少到铁磁磁铁矿。此外，从Ca（OH）（2）的分解反应的煤和水存在下改善气体的减少能力。关于Bastanasite的分解，观察到NaOH-Ca（OH）（2）的明显作用。原始的韧带颗粒的烘焙产品主要由稀土氧化物（REO）组成，氟少，与碱性添加剂的使用无关。通过SEM-EDS在Monazite颗粒中确定了NO高纯度REO，其主要分解为REO和REFEO3。

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