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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. 相似文献
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温旺光 《广东有色金属学报》2000,(1)
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. 相似文献
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《Minerals Engineering》1999,12(12):1407-1417
The flotation processing characteristics of pervoskite, ilmenite and rutile from igneous and sedimentary ores were examined in the course of developing a commercial treatment process. Flotability of these minerals was found to be strongly influenced by a) flotation pH, b) pulp treatment before flotation, and c) type of collector.Modified ester-based collectors, such as phosphoric acid ester, were examined. When these collectors are modified with fatty alcohol ester sulphates, petroleum sulphonate or succinamate, their flotation performance is significantly improved. Efficient flotation of perovskite was achieved with phosphoric acid ester modified with fatty alcohol ester sulphate while ilmenite was floated with phosphoric acid ester modified with petroleum sulphonate. A mixture of phosphoric acid ester and succinamate was the most effective for rutile flotation.Modified phosphoric acid ester was evaluated in both laboratory and pilot plant testwork. Because of the complex gangue compositions of the ores tested, special attention was placed on the selection and evaluation of different gangue depressants.This paper summarizes progress in the development of new collectors for flotation of titanium minerals from complex titanium ores. 相似文献
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《Minerals Engineering》1999,12(5):485-495
An important factor in producing titanium dioxide pigments by the sulphate process is the reactivity of the Ti raw material with sulphuric acid This study shows that Australian ilmenite concentrate contains poorly soluble titanium dioxide-bearing phases with an unfavourable textural distribution. The concentrate is composed of ilmenite and its alteration products, and a mixture of several alteration phases is present in most single grains. Alteration of the ilmenite grain advances to the formation of poorly soluble phases along grain boundaries and fractures that prevent the acid from reaching the soluble ilmenite. The textural relationships of the different phases prevent the liberation of highly altered phases from unaltered or slightly altered phases. The trace element (Cr, V, Si, Al, etc.) concentration increases along with alteration. Most of the deleterious materials are concentrated in the fine fraction of the concentrate. 相似文献
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《Minerals Engineering》2002,15(10):755-757
An alkali roasting process, which consists of roasting with caustic soda, water washing and sulphuric acid leaching, has been found to be an effective method for graphite purification even at low roasting temperature. With this process, a flotation fine concentrate containing 87–88% carbon could be purified to about 99.4% carbon when roasted with 25% NaOH at 250 °C and leached by 10% H2SO4 solution at room temperature. In addition to the successful removal of silicate impurities, the process was also found to be effective to eliminate sulphide impurities. For instance, the sulphur content in the end product could be reduced to below 0.05% from 0.6% by the process. Furthermore, the consumption of NaOH can be lowered by using high-grade feed. When using a feed of 95.9% carbon (upgraded by flotation), the NaOH concentration could be reduced to 10% from 25% while the product purity could reach the same purity level of over 99%. 相似文献
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介绍了纳米材料模拟研究的现状、计算机模拟研究纳米材料的优越性及模拟研究所使用的第一性原理和基于第一性原理的几种主要方法及其运用,提出了第一性原理模拟研究纳米材料所存在的问题和建议. 相似文献
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天然金红石是生产钛白粉的重要原料之一。目前,可利用的高品位天然金红石资源日渐枯竭,探索一种在较低能耗以及较小环境污染下生产人造金红石的方法已日趋迫切。微波加热技术现已广泛的应用于试验和工业生产中,与传统加热相比,有着选择性加热,加热速度快等优点。本文以云南高钛渣为原料提出一种微波加热制备高品质人造金红石产品的新工艺,并利用X射线衍射,扫描电子显微镜,能谱分析等方法对产物进行表征与分析。XRD分析结果表明,高钛渣的主要成分是铁钛氧化物的固熔体,其中的二氧化钛大多是以锐钛矿形式存在,也含少量的金红石相。经过微波焙烧后,锐钛矿的峰已经消失,金红石的峰增强。SEM-EDAX分析结果表明高钛渣表观型貌图中高钛渣颗粒表面比较光滑、平整,但经微波焙烧后物料生成了一些形状不是很规则的短棒状体,这些棒状体即为金红石相。 相似文献
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河北某超贫磁铁矿中钛品位极低,为对其进行综合利用,本试验确定了“阶段磨矿、强磁—浮选”技术路线,即首先在较粗磨矿细度下进行钛铁矿的强磁选预富集,强磁粗精矿再磨后使用新型捕收剂BK426进行钛铁矿无抑制剂浮选.采用该技术,可以从TiO2品位为4.03%的超贫磁铁矿中得到TiO2品位45.48%、回收率为41.01%的钛铁矿精矿,较好地实现了超贫磁铁矿资源中钛资源的综合回收. 相似文献
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以硫酸与氟化钠混合溶液为浸出剂,采用常压浸出工艺处理普通磁铁精矿制备超纯铁精矿。考察了浸出温度,浸出时间,硫酸浓度,氟化钠浓度,浸出液固比对铁精矿品位、回收率以及二氧化硅脱除率的影响。通过浸出前后主要化学成分对比表明:以硫酸与氟化钠混合液为浸出剂,可以有效除去杂质,提高铁精矿品位,在未加入氟化钠时,主要发生的是碱性氧化物的简单酸溶反应,二氧化硅脱除率较低,铁精矿品位提高不高。加入氟化钠有效可以除去SiO_2,随着氟化钠添加量的增加,铁精矿品位不断提高,同时二氧化硅脱除率明显提高,但氟化钠添加量不宜过多。此外,铁精矿品位浸出时间和浸出液固比的增大而提高,浸出温度不宜过高。浸出过程最佳的条件为温度60℃,浸出时间60 min,硫酸浓度60 g/L,氟化钠浓度12 g/L,液固比3:1。在此条件下SiO_2脱除率为70.53%,可以得到品位71.82%,回收率92.78%的超纯铁精矿。 相似文献
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针对攀枝花某选矿厂磁钛精矿的矿石性质,采用H2SO4—Na2SiO3—MOS药剂制度,对TiO2品位22.09%的强磁精矿进行浮选。通过浮选条件试验,确定了最佳浮选条件,然后通过比较浮选开路流程及闭路流程试验,最终获得钛铁矿精矿品位47.81%、回收率80.36%的试验指标。实验室试验获得的钛铁矿回收率与现场钛铁矿回收率相比,取得了较好的试验结果。 相似文献
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攀枝花选钛厂废弃的-0.04mm的磁选尾矿中金属分布率高达39.19%,文中论述了有效回收这部分细粒钛铁矿对充分利用国家资源和提高攀矿企业经济效益所具有的重大意义,并推荐采用离心.离心-强磁-浮硫的选别流程和建设适当规模的氧化球团厂以有效回收这部分资源。 相似文献