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.     

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．     

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。     

盐酸常压直接浸出攀西地区钛铁矿制备人造金红石

以攀西地区钛铁矿为原料，采用．盐酸常压直接浸出法制备高品位人造金红石。结果表明，原矿粒度及盐酸浓度对人造金红石品位影响最大。采用液固比4：1、盐酸浓度30％、温度95℃的条件，对于球磨4h钛精矿浸出4h可得到TiO2含量94．39％的人造金红石产品，对于未磨原矿浸出10h可得TiO2含量91．78％的人造金红石产品。     

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．     

盐酸直接浸取钛铁矿制取人造金红石

研究了盐酸直接浸取钛铁矿制取金红石的方法，探讨了搅拌条件、盐酸浓度、浸取时间、温度、矿粉粒度对浸取效果的影响，利用Ｘ－粉末衍射证明所得产物实现了由锐钛型至金红石型的转型，得到了浸取过程的最佳工艺条件为盐酸浓度６．２７ｍｏｌ／Ｌ；浸取温度１１０℃；液固比４：１（质量）；颗粒粒径３００目以下