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本文着重研究了栲胶对碳酸盐、硅酸盐、各种金属矿物的抑制作用,以及栲胶经进一步加工处理后的应用,为栲胶进一步在选矿方面应用指明方向。 相似文献
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研究了不同工艺条件下海南矿粉预还原烧结矿的矿物组成、含量和显微结构,阐明了预还原烧结矿的形成机理,及矿物组成对其性能的影响。研究表明,预还原烧结矿的矿物组成主要为:浮氏体、金属铁、少量磁铁矿和三元铁酸钙及少量残碳;硅酸盐渣相矿物有β-硅酸二钙、钙铁橄揽石和极少量硅酸盐玻璃相。烧结矿中金属铁相互和联结和硅酸盐渣相固结为其主要的固结方式。 相似文献
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硅酸盐矿物分类及浮游特性初探 总被引:1,自引:0,他引:1
依据硅酸盐矿物Si(Al)-O四面体骨架外金属离子类别,将硅酸盐矿物分成4类.通过对一些选矿研究成果的统计,指出了这4类硅酸盐矿物在破碎特性、表面电位、油酸及十二胺浮选体系中可浮性的差异和该分类方法对硅酸盐矿物浮选的指导作用. 相似文献
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《有色金属科学与工程》2010,(Z1)
依据硅酸盐矿物Si(Al)-O四面体骨架外金属离子类别,将硅酸盐矿物分成4类.通过对一些选矿研究成果的统计,指出了这4类硅酸盐矿物在破碎特性、表面电位、油酸及十二胺浮选体系中可浮性的差异和该分类方法对硅酸盐矿物浮选的指导作用. 相似文献
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研究了氢氟酸(HF)在油酸钠浮选体系中对五类结构九种硅酸盐矿物的调整作用.通过矿物ξ-电位和X光电子能潜(XPS)的测定,以矿物晶体化学特征和表面特性为依据.分析了氢氟酸在硅酸盐矿物浮选中的作用机理.并着重探讨了HF对石英和绿柱石的活化作用.结果表明,氢氨酸对硅酸盐矿物的调整作用与矿物的晶体化学特征具有密切的关系,HF对矿物表面的清洗作用,溶蚀矿物表面硅酸及在矿物表面Al3 形成铝氟络合物,使矿物表面性质发生改变.是氢氟酸调整作用的主要机理. 相似文献
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研究了氢氟酸(HF)在油酸钠浮选体系中对五类结构九种硅酸盐矿物的调整作用,通过矿物ζ-电位和χ光电子能谱(XPS)的测定,以矿物晶体化学特征和表面特性为依据,分析了氢氟酸在硅酸盐矿物浮选中的作用机理。并着重探讨了HF对石英和绿柱石的活化作用。结果表明,氢氟酸对硅酸盐矿物的调整作用与矿物的晶体化学特征具有密切的关系,HF对矿物表面的清洗作用,溶蚀矿物表面硅酸及在矿物表面Al^3 形成铝氟络合物,使矿物表面性质发生改变,是氢氟酸调整作用的主要机理。 相似文献
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根据生物冶金技术中金属硫化矿细菌氧化机理,分析了浸矿微生物固定化的必要性、优势和方法以及具体操作步骤等,提出了利用微生物菌种是生物浸矿的发展方向,具有巨大潜力. 相似文献
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ROSS W. SMITH MANORANJAN MISRA 《Mineral Processing and Extractive Metallurgy Review》2013,34(1):37-60
Microorganisms are finding increasing use in minerals engineering. Goals include both enhancement of mineral engineering operations and remediation of mineral industry wastes. Some of the applications, such as biologically assisted leaching of sulfide ores and biooxidation of refractory sulfide gold ores. are established commercial processes. Others, such as the use of organisms for the removal of heavy metal ions from dilute aqueous streams, are nearing commercial application. Other uses of microorganisms are potentially possible. These include use of microorganisms in leaching non-sulfide ores, the flocculation or flotation of minerals and remediation of toxic chemicals discharged from mineral engineering operations. Genetic engineering of microorganisms and adaptation of existing strains are important potential tools in many of these applications, as is also the identification of new, novel and useful organisms. 相似文献
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Chalcopyrite passivation greatly reduces the yields from leaching and bioleaching but the problem has not been successfully resolved. Passivation involves the formation of a layer of secondary minerals on chalcopyrite surface, which becomes a diffusion barrier to fluxes of reactants and products. This study aims to identify secondary minerals formed during chalcopyrite passivation in the presence of iron- and sulfur-oxidizing bacteria (Acidithiobacillus ferrooxidans) in mineral salts solution. The minerals were characterized with X-ray diffraction, Fourier transform-infrared spectroscopy, and Raman spectroscopy. Potassium jarosite was the initial product covering chalcopyrite grains, followed by the formation of ammonio-jarosite. Covellite and elemental sulfur were also detected in the passivation layer. The results suggest that passivation may be reduced by controlling jarosite precipitation and prior acclimatization of bacteria to oxidize CuS and elemental S in the presence of ferrous and ferric iron. 相似文献
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金属矿产工程地质勘察工作中,岩土水文地质探测至关重要。相关人员需要在施工前,做好充足的准备,对岩土水文地质做好探测和治理。岩土水文地质的条件与工程的建设有直接的影响。所以在工程开展之前要做好探测,对地下水文有足够的了解,掌握好情况,才能进一步展开施工。本文针对金属矿产工程地质勘察中的岩土水文地质展开进一步思考。 相似文献
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细菌浸出作为一种经济、环保的处理技术,广泛应用于金属硫化物的金属提取和预处理过程中。为进一步理解细菌在硫化物浸出过程中的作用,详细阐述了细菌在浸出过程中的作用机理及其在矿物表面的作用机制,系统描述了金属硫化物溶解的硫代硫酸盐与多硫化合物途径。同时,还重点介绍了常见浸矿细菌的生存环境,并对不同种类浸矿细菌之间的协同作用进行了分析。 相似文献
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A scanning electron microscope (SEM) study was performed to provide a visual insight into the oxidation patterns of sulfide minerals during chemical and bacterial leaching of a complex ore for 3 days. The mineral grains were studied under SEM before and after bacterial and chemical leaching with or without the addition of ferrous iron to generate ferric iron in situ by bacteria or chemical oxidant (MnO2). Both mesophilic and moderately thermophilic cultures of bacteria were used in bioleaching tests. A limited oxidation of sphalerite and pyrite, similar to those in acid leaching (control), was observed to occur when no ferrous iron was added. However, the initial addition of ferrous iron into bioleaching media was shown to significantly improve the oxidation of sphalerite and pyrite. Galena was readily oxidized in the presence or absence of bacteria. Sphalerite was oxidized more extensively/selectively than chalcopyrite and pyrite, consistent with their respective nobility/electrochemical activity. Provided that chemical/biological oxidation of sphalerite was intensive, a sulfur-rich layer appeared to form on mineral surface. But, no such layer on pyrite surfaces was discernable. Supplementary bioleaching data were also provided to support SEM observations and to further elucidate the bioleaching characteristics of these sulfide phases. It can be inferred from this study that the oxidation of sulfides proceeds most discernibly via “indirect mechanism” and the generation of ferric iron by bacteria in sufficient quantity is essential for the effective oxidation of sulfide minerals. 相似文献
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为提高胶硫钼矿中钼的生物浸出效率,研究了非离子表面活性剂吐温20对氧化亚铁硫杆菌(A.ferrooxidans)的代谢活性以及胶硫钼矿生物浸出的影响,并采用X射线衍射、扫描电镜对浸出产物进行表征.研究结果表明,吐温20对A.ferrooxidans氧化Fe2+有明显的抑制作用,但对S0的氧化则表现出一定的促进作用.吐温20对胶硫钼矿生物浸出的作用表现为:低质量浓度促进,高质量浓度抑制,当其质量浓度为30 mg·L-1时,浸出40 d,Mo的浸出率由未添加时的42.21%提高至54.10%.吐温20的加入强化了浸出过程中间产物S0的生物氧化作用,提高了体系中细菌浓度,同时削弱了矿物表面生成的黄钾铁矾和单质硫的钝化作用,从而促进了胶硫钼矿的氧化与溶解. 相似文献