钛铁矿选择氯化法制取人造金红石的热力学与动力学

研究了钛铁矿选择氯化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”，解决了选择氯化“自热”反应持续进行的技术关键，对反应参数进行了实验室，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”，动力学区的活性能为34．33kJ/mol；扩散区的活化能为0．80kJ/mol，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％，床层单位炉产能达12．4t/(m2.d)，该工艺和设备已成功地应用于工业生产。     

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.     

Extraction behaviours of titanium and other impurities in the decompositio process of ilmenite by highly concentrated KOH solution

To effectively utilize ilmenite and recycle KOH solution,the extraction behaviours of titanium and other associated impurities in the decomposition process of ilmenite by highly concentrated KOH solution were studied.Experiments on the extraction behaviours of titanium as well as other associated impurities of ilmenite such as iron,silicon,calcium,and aluminiurn were carried out.The effects of various parameters,including reaction temperature,KOH concentration,reaction time,alkali-to-ore mass ratio,and particle size on the extraction rate of titanium and other impurities were examined.When the finely ground ore (58-75 μm) reacted with KOH solution (80wt％) in an alkali-to-ore mass ratio of 7:1 at 260°C for 60 min,almost complete extraction of titanium was achieved,while the extraction rate of aluminium was 78％ and that of other impurities was less than 22％.Moreover,high purity (98.2wt％) TiO2 with the anatase structure could be gained in the purification process.     

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．     

从钛浮选尾矿中回收钛铁矿的试验研究

对攀钢选钛厂细粒级钛铁矿浮选尾矿采用强磁－磨矿－浮选工艺，得到的钛精矿品位46．34％，产率3．12％，并建议采用“浮钛尾矿强磁选 富集，磨矿后返回原强磁－浮选流程”工艺回收尾矿中钛铁矿。     

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．     

某钒钛磁铁矿尾矿资源化利用

承德市某钒钛磁铁矿尾矿钛含量较高,潜在回收价值可观。采用化学分析、XRD衍射分析、粒度分析、矿物解离分析仪(MLA)等手段研究了该尾矿的矿物学特性及钛的赋存状态。在工艺矿物学研究基础上,通过试验研究确立了重选短流程回收钛、选钛尾矿差异化分级利用的综合利用技术工艺,获得含TiO234.60%、回收率53.43%的钛铁矿精矿以及产率66.22%的建筑用商品砂,实现了铁尾矿的资源化综合回收利用,有助于矿山与社会环境和谐发展。     

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.     

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。     

Wetting between molten iron and prereduced ilmenite with carbon

An interfacial study between molten iron and the prereduced ilmenite with carbon was conducted at different melting temperatures by the sessile droplet method. The wetting characteristics between molten iron and the prereduced ilmenites with carbon were investigated by measuring contact angle of the droplet of molten iron on the prereduced ilmenite substrate. The images of the interface were also examined by the optical microscope and SEM equipped with EDS. The volume of molten iron increased with the melting temperature increasing when titania or high-content titania slag was used as the substrate. The contact angle decreased with the melting temperature increasing and it was independent on time at constant temperature. The contact angle was positively correlated with the reduction degree of the ilmenite, but the work of adhesion was negatively correlated with it. Higher smelting temperature was beneficial to the separation of iron and Ti oxides. The permeability of molten iron into the prereduced ilmenite with carbon was more obvious with reduction degree increasing owing to the high porosity of prereduced ilmenite.