钛铁矿碳热反应原位合成GT35钢结硬质合金的热力学分析

充分利用天然矿物钛铁矿(FeTiO3)中的铁和钛,采用原位合成反应烧结技术,成功制备了TiC基钢结硬质合金GT35.在真空炉中实现了合成与烧结一体化,为钢结硬质合金的低成本制备进行了有益的探索研究.对钛铁矿-碳体系的热力学过程进行了详细的理论分析,研究表明:体系主要发生碳热还原反应,中间产物为多种钛的氧化物,热力学上最为稳定的物相为TiC和Fe固溶体.通过实验证实,获得了界面结合良好、组织致密的钢结硬质合金.     

钛铁矿原位碳热还原合成TiC/Fe的热力学过程及合成条件研究

以天然矿物钛铁矿（ＦｅＴｉＯ_３）、Ｃ（石墨）为原料,采用原位碳热还原法,实现合成与烧结一体化,真空烧结制备了ＴｉＣ／Ｆｅ复合材料,探索了一条低成本合成高性能ＴｉＣ／Ｆｅ复合材料的新途径．对反应的热力学过程进行理论分析和实验研究,探讨了产物的合成条件．研究表明,ＴｉＣ的反应形成机理是：首先,ＦｅＴｉＯ_３被Ｃ还原生成Ｔｉ_ｘＯ_ｙ和α－Ｆｅ;然后,Ｃ继续与Ｔｉ_ｘＯ_ｙ反应,将氧一步一步还原出来,直至生成ＴｉＣ;ＴｉＣ颗粒长大的过程是,先形成富Ｔｉ缺Ｃ的ＴｉＣ_ｘ,然后ＴｉＣ_ｘ继续与Ｃ反应形成接近化学计量比的ＴｉＣ．烧结温度范围在１５００～１６００℃之间,随温度的升高,产物的硬度和密度稍有提高．Ｍｏ的加入可以改善金属相对ＴｉＣ的润湿性．产物中有少量游离碳存在．     

人造金红石生产近况

叙述了人造金红石生产的工艺概况,各主要生产公司的发展近况、对钛铁矿原料的要求以及生产高品位人造金红石的趋势.     

攀枝花细粒钛铁矿浮选工艺在生产中应用探讨

介绍了攀枝花细粒钛铁矿浮选回收工艺技术近几年所取得的突破,对在现场应用浮选工艺的必要性进行了论述。并对现场应用采取的分级粒度界限及工艺流程进行了探讨,提出了粗粒重选－电选、细粒强磁选－浮选的思路。     

微波碳热还原钛铁矿扩试研究

在小试已获得最佳工艺条件的基础上,通过微波推板窑设备,进行微波碳热还原钛铁矿的扩大实验。钛铁矿、复合还原剂、添加剂混合物料依次经过微波推板窑的预热段、加热段、保温段,到达冷却段时,完成还原反应。实验结果表明:碳热还原温度1150℃,还原时间80min,腔体内微负压条件下,FeTiO3中的氧化铁90%被还原成Fe,TiO2含量提高至60%~65%,TiO2、FeO、C、S、P含量都符合制备焊条药皮原料标准,微波推板窑的利用系数为25.8ψt/(m3·d),采用复合还原剂还原每吨钛铁矿成本可降低184~490元,并且微波推板窑可以实现连续生产。     

SLon磁选机分选攀钢微细粒钛铁矿的工业试验

赣州有色冶金研究所与攀钢选钛厂合作，应用ＳＬｏｎ－１５００立环脉动高梯度磁选机进行了微细粒级钛铁矿磁选－浮选流程中磁选部分的工业试验，当给矿品位为１１．０３％ＴｉＯ２时，经一次磁选作业，获钛精矿品位为２１．２％ＴｉＯ２、回收率为７６．２４％的指标，为浮选获最终钛精矿奠定了坚实的基础。     

Phase Evolution during Carbothermic Reduction Process of Ilmenite for TiC_xN_(1-x) Composite Powders

As cutting materials and wear-resistant materials, the composites reinforced by Ti(C,N) have very high performances. The super-high cost of these composites, however, limits apparently their wider application to industry due to use of very expensive Ti(C,N) powders. Therefore, it is very necessary to develop a new process technology with low fabrication cost. In the present work, ilmenite (FeTiO3), which is very cheap and very rich in China, was used to fabricate the Ti(C,N) powder directly. The phase evolu...     

流化床内氧化钛铁矿过程的非等温行为

本文以流化床反应器的两相模型理论为基础．建立了描述在流化床内氧化钛铁矿反应的非等温数学模型．根据由实验测定的氧化反应表观速率常数和反应热效应，以及用经验公式估算的其它参数值，采用Ｒｕｎｇｅ－Ｋｕｔｔａ法求解该动力学模型．计算结果表明，床层内温度的计算值与实测值基本吻合．流化床内最高温度值随人炉气体（Ｏ２－Ｎ２）中氧气浓度线性增大，流化床的散热主要是通过床展与器壁间的传热实现的．     

Impact of barite and ilmenite mixture on enhancing the drilling mud weight

It is common knowledge in the technology of drilling fluids, monitoring of the drilling mud weight is critical in developing a mud system that yields good well stability. Alternative weighting materials should be in demand to offer superior properties such as barite, available in sufficient reserves to meet field requirements and be competitively priced. A weighting material that can be sourced locally to substitute barite would be a good innovation in the drilling industry. The present work was performed for enhancement the weighting of the drilling fluids by using mixture of barite and ilmenite. Micro-sized ilmenite ore (FeTiO₃) particles were obtained by a direct solid phase milling process to replace a certain percentage of barite as weighting material of the drilling mud. X-ray diffraction (XRD) analysis was carried out to underline the phase identification of the crystalline ilmenite, used drilling mud weighting agent as barite and Na-bentonite particles. The lamellar shape and the arrangement in overlapping plates of ilmenite particles, Platy-like shaped Na-bentonite grains against sub-angular and square-shaped barite particles were confirmed by scanning electron microscope (SEM) technique. Three mud samples with different densities were prepared which be made up of fresh water, sodium bentonite and weighting material. The weighting materials were added up to the mud separately to form the required mud density ranges between 8.65 and 18?lb/gal. The first sample was water-based mud with barite; second sample was water-based mud with local ilmenite ore and third sample was water-based with barite and ilmenite in which were added in parts as 50:50 by ratios. These samples were investigated at different temperatures (normal, 120, 160, 180?°F) and the employed mud density range to determine solid content, density, rheological properties and filtration losses. The study showed that the rheological properties of barite/ilmenite mixture were found to give comparable results as barite and has the potential to be used as alternative weighting material especially in a heavier drilling mud. Two significant advantages could be observed through using the mixture; it produces lower solids content and fluid loss which in turns reduces the formation damage, respectively.     

攀枝花密地选钛厂细粒钛精矿生产线优化改造

分析了攀枝花密地选钛厂细粒钛精矿生产线存在的主要问题, 对浮选准备作业和选别作业提出了相应的优化措施。经过优化改造, 细粒钛精矿实际产率和回收率分别提高到3.28%与18.55%, 同时生产成本大幅降低, 取得了良好的经济效益。