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难处理金矿石预处理方法研究现状及其发展趋势 总被引:18,自引:3,他引:15
本文对难处理金矿石进行了定义、分类,简要分析了难处理金矿石难浸的原因,指出该类金矿石浸前须进行预氧化,才能取得理想效果;详细综述了氧化焙烧、加压氧化、细菌氧化和化学氧化等难处理金矿石预处理方法在国内外的研究与应用现状,并评述了各方法的优缺点;对难处理金矿石预处理方法的未来发展趋势作了展望。 相似文献
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难处理金矿石预处理工业规模生物氧化堆的运转表明了矿石堆随黄铁矿的氧化对热流的反映。堆的温度可达75℃,这么高的温度对嗜温氧化铁细菌是致命的。JamesA.Brierley等进行了柱浸试验,比较了细茵对难处理硫化物金矿石生物氧化预处理的作用及当细菌和archaea在不同温度下生长时对温 相似文献
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难处理金矿石选冶技术现状及发展方向 总被引:22,自引:2,他引:20
我国难处理金矿资源分布较广,并且在已探明的地质储量中占有较大比例。合理,高效和环保地开发利用难处理金矿资源的关键在于难处理金矿石选冶技术的开发和工业化应用程度,从国内外金矿石冶技术的应用和发展趋势分析,焙烧氧化,细菌氧化和热压氧化3种预处理工艺将成为未来开发利用难处理金矿资源的基本工艺。针对国内难处理金矿资源的特点,进一步开展上述预处理工艺的工程化应用研究,是今后我国黄金生产工业发展的主要方向之一。 相似文献
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难浸金矿石细菌氧化的发展与革新 总被引:2,自引:1,他引:1
难浸金矿石细菌氧化的发展与革新P.C.Aswegen等前言南非通用采矿金属矿物公司(Genmin)工艺研究所发展了细菌氧化预处理难浸矿石回收金的方法。早期研究在本世纪50年代后期就已开始,当时从西兰德联合公司地下矿流出液中分离出氧化亚铁硫杆菌,但那时... 相似文献
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复杂难处理金矿石中因金被硫化矿物或脉石矿物所包裹等导致浸出过程中金浸出率低,而预处理工艺可以有效打开金的包裹,使金解离裸露,从而提高金综合回收率。介绍了5种主要的预处理工艺,包括超细磨工艺、焙烧氧化工艺、热压氧化工艺、生物氧化工艺及化学氧化工艺,阐述了各工艺的基本原理、工艺流程、研究进展及工业应用情况,并对各工艺的优缺点进行了分析比较,旨在为复杂难处理金矿石提金提供理论依据和技术参考。 相似文献
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难处理金矿石预处理方法研究进展及对策建议 总被引:9,自引:0,他引:9
周一康 《有色金属(冶炼部分)》1999,(6):33-37
综述了近年来国内外难处理金矿石预处理方法的研究和应用进展,难处理金矿石预处理的关键是预氧化和(或)去除碳质矿中碳的“劫金”作用,预氧化方法主要有焙烧法、加压氧化法、细菌氧化法、氯化法等,针对我国资源特点,提出了应采取的措施和发展对策. 相似文献
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The paper presents a solution to the problem of diffusional growth of multi-layered scale formed of phases with variable composition, densities and diffusivities. Comparison of the parabolic rate constants of wustite scale formation for moving-boundary- and quasi-steady-state growth models is given and it indicates that neglecting the moving-boundary condition may lead to systematic errors—notable in compounds showing the large deviation from stoichiometry. The solution describes the moving-boundary-state process of growth and is presented for iron-oxygen and cobalt-sulphur systems The proposed formalism may be used to describe any diffusional growth of multilayered products, e.g., for metal-metal, or metal-liquid reactions. 相似文献
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研究了310S耐热不锈钢在800、900、1000、1100、1200℃时高温循环氧化性能,采用SEM、XRD、EDS对高温循环氧化生成物进行分析。实验结果表明:1000℃以下时,钢的氧化速率较为缓慢,当温度达到1200℃时其氧化速率急剧增加。310S耐热不锈钢高温循环氧化产物分为3层,外层是FeO·Cr2O3和尖晶石结构的MnCr2O4,中间为Cr2O3,内层为SiO2氧化膜,这种结构是其具有良好耐高温氧化性能的主要原因。 相似文献
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The kinetic curve of the high-temperature oxidation of austenitic stainless steel Cr18Ni11Cu3Al3MnNb at different temperatures was measured by weighting method. It is showed that the oxidation curves at 700 and 800 ℃ followed the parabolic law, and the steel presented an excellent anti-oxidation. The surface morphology and structure of the oxide film were studied by scanning electron microscopy and X-ray diffraction methods. A dense oxide film was attained at 700 and 800 ℃, mainly composed of the hexagonal Al2O3, Fe2O3, and a small amount oxide of Cr at 700 ℃. At 900 ℃ the oxide film started to delaminate, and was composed of (Cr,Fe)2O3 and the spinel CuCrMnO4 and Fe(Cr,Al)2O4. 相似文献
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ABSTRACTAlloys with composition of Ta-10?wt.% W and Ta-10?wt.% W-6?wt.% Al, respectively, were prepared by the hot-press sintering process. The oxidation behaviour at 900°C and 1000°C was studied. The oxidation weight gain curves of the Ta–10%W alloy followed the linear law and the final oxidation product was Ta2O5 solid solution. Meanwhile, due to the addition of Al, the oxidation weight gain curves of the Ta–10%W–6%Al alloy followed the parabolic law. The final oxidation products at 900°C formed a dense outer layer Al2O3 and an inner layer. However, after being oxidised at 1000°C, the oxidation products included Al2O3, AlTaO4 and Ta22W4O67. Since the dense Al2O3 oxide film was consumed by the generation of AlTaO4, the inward diffusion of oxygen cannot be prevented. The oxidation resistance degraded at 1000°C. The addition of Al significantly improved the oxidation resistance of the Ta-W-based alloy system. 相似文献
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Crofer22 APU铁素体不锈钢是固体燃料电池连接体的备选材料之一。通过增重法研究了Crofer22 APU铁素体不锈钢在800℃空气中的抗高温氧化动力学,并结合X射线衍射(XRD)、扫描电镜(SEM)、能谱分析(EDS)等手段,对氧化膜的形貌和组成进行了分析。结果发现,Crofer22 APU 铁素体不锈钢在800℃下 0~100h 的平均氧化速率为0.032g/(m2·h);100~450h的平均氧化速率为0.0091g/(m2·h);450~550h的平均氧化速率为50×10-4g/(m2·h)。氧化膜分为内外两层,内层主要是含SiO2的氧化物,外层主要是含Cr2O3的氧化物。 相似文献
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混合基体炭/炭复合材料的低温氧化行为 总被引:1,自引:0,他引:1
研究了混合基体C/C复合材料在静态空气和流动氧气2种环境中的氧化动力学,探讨了氧化速率与时间、温度的关系,并对材料氧化后的显微形貌进行分析。研究结果表明:在静态空气气氛和流动氧气气氛中,氧化失重曲线都是非线性的;材料在流动氧气中的起始氧化温度约为650℃;在氧化反应的开始阶段氧化速率大于氧化稳定后的速率;氧化优先从界面、缺陷以及孔隙处开始,并向纵深发展。 相似文献
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G. N. Komratov 《Powder Metallurgy and Metal Ceramics》2000,39(1-2):67-72
The effect of powdered nickel additions (10–33 mass %) on the oxidation kinetics of double titanium-chromium carbide produced
by the method of self-propagating high-temperature synthesis, and also that of plating the synthesized carbide powder with
nickel (26 mass %) was studied. The effect of nickel concentration and powder particle size on the oxidation resistance at
different temperatures was different. However, it can be stated that plating the carbide powder with nickel increased its
oxidation resistance at all temperatures in the range 600–1000°C, excepting 700°C. The degree of oxidation of the carbide
and nickel constituents were estimated. Activation energies for the initial and parabolic stages of oxidation were determined.
Translated from Poroshkovaya Metallurgiya. Nos. 1/2(411), pp. 76–82, January–February, 2000. 相似文献