Geochemical Characteristics of a Carbonatite Dyke Rich in Rare Earths from Bayan Obo, China

Since the discovery of the carbonatitedykes at Bayan Oho of inner Mongolia, Chi..[l], more and more evidence from geologicaland geochemical investigations reveal that theore-hosted dolomite marble of the Bayan OboRE-Nb-Fe giant mineral deposit is similar tocarbonatite in origin['~7]. Although it is notfully clear at present whether there is a realpetrogenetic linkage between the formation ofthe ore deposit and the intrusion of the carbonatite dykes, there is no doubt that the studiesof the …     

CeO_2含量对白云鄂博西尾矿为原料制备的微晶玻璃力学性能的影响

以白云鄂博西尾矿和粉煤灰为主要原料,采用熔铸法制备了高性能的CaO-MgO-Al2O3-SiO2(CAMS)系微晶玻璃。研究了不同晶化温度下CeO2含量对CAMS系微晶玻璃析晶行为、显微结构和力学性能的影响。结果表明:Ce4+离子可以置换辉石相主晶相中Ca2+形成置换固溶体;质量分数为0.6%的CeO2可以降低微晶玻璃的晶化温度、提高辉石相结晶度、促进其形成交错咬合的枝晶结构,从而提高微晶玻璃样品的抗折强度和显微硬度;过量的CeO2富集于辉石相晶间并进而形成Ca2Ce8(SiO4)6O2第二相晶间相,阻碍辉石相的形成和长大,从而使样品的力学性能有所降低。添加0.6%CeO2的微晶玻璃样品经870℃晶化2 h后,抗折强度和显微硬度分别达到234 MPa和6.982 GPa。     

膨润土对白云鄂博铁精矿球团矿生球及成品球强度影响

膨润土主要作为黏结剂用于球团矿生产过程以提高球团矿强度,不同膨润土对球团矿生球及成品球强度有不同的影响.在测定两种膨润土的理化性能和化学成分基础上,将其与白云鄂博铁精矿混合造球,试验测定生球及焙烧后的成品球强度.分析可知,膨润土中胶质价含量越高,白云鄂博铁精矿球团矿生球强度越大;膨润土的吸水率高有利于提高球团矿生球抗压...     

白云鄂博多金属矿含铁矿物嵌布特性研究

白云鄂博多金属矿是我国复杂难选铁矿资源之一,近年来对多金属矿进行技术攻关,但铁资源利用率较低。为了解矿石性质的变化,采用化学分析、矿物参数自动定量分析系统、偏光显微镜、扫描电子显微镜等方法及设备对多金属矿中铁矿物进行嵌布特性研究。结果表明：多金属矿中TFe含量为31.55%,主要含铁矿物为磁铁矿、赤铁矿、褐铁矿、黄铁矿（磁黄铁矿）、菱铁矿,其中磁铁矿含量占9.467%,赤铁矿含量占31.280%。矿石中铁矿物以磁性铁和赤褐铁两种铁物相为主,磁性率为49.15%,为混合铁矿石类型。矿石中磁铁矿多与脉石相互交织形成网状嵌布,且夹杂少量黄铁矿,而赤铁矿多以斑状、粒状、浸染状、鳞片状集合体嵌布,两者中存在微细包裹体结构。铁矿物粒度不均,在-0.040mm粒级约55%,且磁铁矿、赤铁矿与28种矿物嵌连,主要是萤石,赤铁矿、磁铁矿、稀土、石英、重晶石、方解石、铁白云石。在-0.074mm占60%的磨矿细度下,铁矿物解离度达82.78%,但微细粒铁矿物包裹体与脉石、微细粒脉石矿物包裹体与铁矿物均解离困难,阶段磨矿及充分细磨是铁矿物高效回收的关键。     

白云鄂博西矿白云石型低品位铁矿石利用研究

白云鄂博西矿白云石型低品位铁矿TFe含量为20.55%,铁主要赋存于磁铁矿中,其占有率为70.02%。为充分开发利用该矿石,拟采用磁滚筒干式磁选抛尾对该矿石进行预处理,减少矿石处理量,然后采用粗磨—弱磁选和细磨—弱磁选工艺进行选别,提高铁精矿品位。系统考察了磁辊筒转速、抛尾粒度、抛尾段数、磨矿细度等因素对干式抛尾—粗磨—弱磁选和细磨—弱磁选工艺的影响。结果表明,通过干式抛尾—粗磨—弱磁选、细磨—弱磁选工艺可获得TFe品位为68.09%、TFe回收率为56.90%、MFe回收率为79.84%的铁精矿。研究结果为白云鄂博西矿白云石型低品位铁矿石的开发利用提供技术借鉴和参考。     

白云鄂博尾矿库及其资源利用研究概况

本文围绕白云鄂博尾矿库,从尾矿库基本情况,尾矿资源特性,尾矿资源利用研究进展等方面进行综述,以期为今后白云鄂博尾矿资源的更好利用奠定基础。      

利用白云鄂博含铌尾矿制备铌铁工艺的研究

分析了白云鄂博稀土铌铁复合矿中铌资源的赋存特点,总结了铌铁生产原理与方法以及我国现有以白云鄂博含铌尾矿为原料的铌铁制备工艺流程.在此基础上,针对现有工艺中的不足,提出了一种新型铌铁制备工艺流程,为解决我国白云鄂博矿铌资源的综合利用问题提供了一种新的思路.     

Effect of bastnaesite as reductant on hematite reduction during in-situ suspension magnetization roasting of refractory iron ore under neutral atmosphereOA

The iron tailings of Bayan Obo mines are solid waste,which occupies land area and also causes environmental pollution;however,this waste can be recycled.In this study,based on the characteristics of iron minerals and fluorocarbonate contained in Bayan Obo iron tailings,clean magnetization roasting of iron minerals by bastnaesite from iron tailings during in-situ suspension magnetization roasting in a neutral atmosphere was explored.The results show that for iron tailings with a mass of 12 g, a N...     

Gaseous hydrogen storage properties of Mg-Y-Ni-Cu alloys prepared by melt spinning

For purpose of promoting the hydrogen absorption and desorption thermodynamics and kinetics properties of Mg-Ni-based alloys, partially substituting Y and Cu for Mg and Ni respectively and melt spinning technique were applied for getting Mg_(25-x)Y_xNi_9 Cu(χ = 0-7) alloys. Their microstructures and phases were characterized with the help of X-ray diffraction and transmission electron microscopy. Their hydrogen absorbing and desorbing properties were tested by a Sievert apparatus, DSC, and TGA, which were connected with a H_2 detector. In order to estimate the dehydrogenation activation energy of alloy hydride, both Arrhenius and Kissinger methods were applied for calculation. It is found that their hydriding kinetics notably declines, however, their hydrogen desorption kinetics conspicuously improves, with spinning rate and Y content increasing. Their hydrogen desorption activation energy markedly decreases under the same constraint, and it is found that melt spinning and Y substituting Mg improve the real driving force for dehydrogenation. As for the tendency of hydrogen absorption capacity,it presents an elevation firstly and soon after a decline with the rising of spinning rate, however, it always lowers with Y content growing. With Y content and spinning rate increasing, their thermodynamic parameters(△H and △S absolute values) visibly decrease, and the starting hydrogen desorption temperatures of alloy hydrides obviously lower.     

白云鄂博东矿霓石型矿石中铌的分布规律研究

采用化学分析、偏光显微镜、扫描电镜、能谱仪等手段对白云鄂博东矿霓石型矿石中铌分布规律进行研究。研究结果表明,矿石中含铌矿物主要是黄绿石、铌铁矿、铌铁金红石、易解石、褐钇铌矿和包头矿;铌元素在矿物中分布率分别为黄绿石46.89%、铌铁金红石11.46%、褐钇铌矿5.89%、易解石4.57%、铌铁矿3.91%和包头矿2.35%;铌矿物嵌布粒度细;铌矿物与稀土矿物、铁矿物、霓石和闪石等脉石矿物嵌布关系密切。矿物粒度细、矿物种类多、矿物之间嵌布关系复杂是后期分选难题。