SHS结合热压制备TiC-Al2O3/Fe-Al复合材料

以天然钛铁矿、铝粉和石墨为主要原料,采用自蔓延高温合成技术、铝热还原法并结合热压烧结技术,制备出TiC—Al2O3／Fe—Al复合材料．研究表明：预热时间少于120s时,预热时间越长,反应燃烧波速度越大,当预热时间继续增大,对反应燃烧波速度的影响不再显著;加入添加剂Y2O3为0．2％时,金属相较均匀地弥散分布在陶瓷颗粒周围．晶粒尺寸约为2～3μm,复合材料的相对密度达到94％,抗弯强度和硬度分别为599．29MPa、83．7HRA．     

选择氯化钛铁矿制取人造金红石

研究了选择氯化钛铁矿制取人造金红石反应的Ｆｅ－Ｔｉ－Ｃ－Ｏ２－Ｃｌ２系平衡图,计算了氧与某些氯化物相互作用的自由能变化,采用“通氧一步选择氯化法”,在钛铁矿原料中配加适量的碳,并往炉内通入相应量的氧气或空气,可以解决选择氯化“自热”反应持续进行的技术关键．对反应参数,如温度、配碳量、物料粒度、氯化时间和通氧量等均进行了实验室、半工业和工业化生产试验研究．研究证明,选择氯化过程的动力学模型是“固体颗粒粒度保持不变的缩核反应模型”,动力学区的活化能为３４．３３ｋＪ／ｍｏｌ;扩散区的活化能为０．８０ｋＪ／ｍｏｌ．试验结果表明,这种选择氯化新工艺具有流程短、产能大、产品质量好、成本低、操作简单等优点．研究开发的无筛板沸腾氯化炉可以长期稳定地连续运转,生产出的人造金红石品位为９２．１０％．经摇床和磁选,品位达到９５％,钛的回收率和氯的利用率都大于９５％,床层单位炉产能达１２．４ｔ／ｍ２ｄ．该工艺和设备已成功地应用于工业生产．     

用乳化塔尔油浮选攀枝花微细粒级钛铁矿的工业试验

用乳化塔尔油作捕收剂浮选攀枝花的微细粒级钛铁矿的工业试验,获得钛精矿品位４６．４４％,回收率６０．０２％,表明乳化塔尔油是攀枝化微细粒钛铁矿较合适的捕收剂,同时亦分析了硫酸,粒度等因素对钛铁矿浮选的影响．     

Kinetics of the oxidation of ilmenite

The oxidation of ilmenite (FeTiO₃) in air and dry oxygen was investigated over the temperature interval 600 to 970°C. Dense platelets of ilmenite crystals as well as powder samples of ilmenite were oxidized. The weight data were recorded employing a thermobalance. The oxidation kinetics of ilmenite platelets were parabolic except for the initial stages during which logarithmic kinetics were observed. For powder samples the logarithmic rate law was followed primarily. The logarithmic rate law was attributed to free penetration of oxygen through cracks and short-circuit paths. The activation energies associated with the logarithmic rate law were nearly one-half of those obtained from parabolic oxidation. The growth morphology of the products of oxidation of ilmenite was observed with a scanning electron microscope. The effect of growth morphology on the kinetics is discussed, and a probable reaction mechanism is suggested for the oxidation of ilmenite.     

云南富宁良子老寨钛铁矿成矿规律和矿床成因

云南富宁地区钛铁矿是我国重要的钛铁矿矿床,成矿条件优越。本文对良子老寨矿区残坡积风化壳型钛铁砂矿床的地质特征、矿体、矿石特征进行了总结和研究,探讨了矿床的矿床成因和成矿规律。海西—印支期偏碱性基性钛辉辉长辉绿岩体为该区钛铁矿的形成提供了物质来源。富宁地区温热潮湿多雨气候有利于风化作用形成,岩体出露地表后,岩体中的钛矿物经风化剥离、水解作用、次生富集、原地残留或近距离搬运沉积,形成了残坡积风化壳型钛铁砂矿床。陡坡、临近河流区域矿体厚度薄,风化作用弱部位品位低;山脊缓坡、河谷阶地、地形低凹地段矿体厚度较大、品位高。本文研究成果能够指导滇东南地区残坡积物风化壳内钛矿的找矿工作。     

钛铁矿和高磷铁矿混合矿氧气顶吹熔融还原炼铁的工艺条件

采用氧气顶吹熔融还原法进行了高磷铁矿和钛铁矿混合矿炼铁的实验研究,考察了熔渣四元碱度、反应温度、碳氧摩尔比、通氧时间、保温时间和氧流量对炼铁效果的影响. 结果表明,提高反应温度、在一定范围内增加CaO加入量、提高碳氧摩尔比、延长通氧时间和保温时间、增加氧流量都能不同程度地提高铁还原率. 确定的合理工艺条件为：温度1500℃,碱度1.3,碳氧摩尔比1.0,保温时间30 min,通氧时间10 min,氧流量350 L/h,在此条件下渣铁分离较好,铁还原率达96.17%.     

Study on surface magnetization recover ilmenite from titanaugite using surfactant sodium oleate

ABSTRACT

Separation of ilmenite from titanaugite was investigated by magnetic coating. By enlarging magnetic difference between ilmenite and titanaugite, ilmenite was efficiently recovered. Scanning electron microscope and vibrating sample magnetometer results indicated that magnetite selectively coated onto ilmenite surface and increased its magnetism, which resulted in different magnetic separation behavior between ilmenite and titanaugite. FTIR and contact angle measurements confirmed that the adsorption difference of sodium oleate resulted in a stronger hydrophobicity on magnetite and ilmenite than titanaugite. Interaction energy analysis illustrated that hydrophobic association interaction on ilmenite was stronger than that on titanaugite, and which led to the selective coating of magnetite onto ilmenite.     

硫酸法钛白酸解尾渣工艺矿物学特性分析

采用激光粒度仪、XRD、XRF、ICP-AES、SEM-EDS、比重法、筛分法等对硫酸法钛白生产过程中酸解尾渣进行系统的工艺矿物学特性分析,旨在为回收钛资源提供理论指导。研究表明,酸解尾渣表面潮湿,液相约占45%,其中易水解的可溶钛为4.06%(以TiO₂质量分数计);固相中不溶TiO₂干基含量为17.14%,固相颗粒粒径主要分布于1～100 mm,密度为3.21 g·cm^-3,颗粒大小、形状不一,有块状、锥状及团聚絮状。通过筛分实验得知钛矿与其他杂质颗粒的粒径、密度有明显差异,少量120 mm以上颗粒含有石膏,密度约3.41 g·cm^-3;18～75 mm主要为钛铁矿,密度大于3.54 g·cm^-3,钛品位可达26%;18 mm以下颗粒主要为硅泥,密度约2.90 g·cm^-3,易团聚,与水形成黏稠物,难分离。     

ICP-OES测定钛铁矿中11种杂质元素

研究建立了用HNO3-HF-HClO4-HCl分解钛铁矿试样,利用电感耦合等离子体发射光谱仪(ICP-OES)同时测定钛铁矿中V、Cu、Mn、Pb等11种杂质元素的测定方法。确定了仪器测定最佳工作条件及分析谱线,采用Y内标元素消除钛、铁基体效应。方法的线性相关系数>0.999,相对标准偏差为0.60%～3.73%,加标回收率为94%～108%。结果表明:本法精密度和准确度较好,方法快速、简便。     

Removal of iron from ilmenite by KOH leaching-oxalate leaching method

Oxalic acid was used for the removal of iron from the intermediates of ilmenite leached by KOH liquor. Various parameters, such as pH, temperature, initial oxalate concentration, and illumination were investigated. Meanwhile, it was found that orthorhombic crystal Ti2O2(OH)2(C2O4)·H2O formed as the leaching proceeded. Scanning electronic microscope (SEM) images implied that the formation of Ti2O2(OH)2(C2O4)·H2O with good crystallinity proceeded through three stages. Calcining Ti2O2(OH)2(C2O4)·H2O, anatase (350°C) or rutile (550°C) type TiO2 was obtained, respectively. Element analysis found that the calcined product contained 94.9% TiO2 and 2.5% iron oxide, but only about 1600 ppm dissolvable iron oxide was left, which indicates that oxalic acid was comparatively effective on iron oxide removal from the intermediates. Finally, an improved route was proposed for the upgrading of ilmenite into rutile.