典型金属矿山选矿药剂与重金属污染综述

通过分析我国钼矿与铅锌矿重金属及选矿药剂的污染研究进展,及其交互作用的研究现状,得出金属矿山的污染研究应当同时重视金属元素的长期效应和选矿药剂的隐蔽污染性;同时应当结合矿山整体环境条件以及根据不同的矿种,从机理研究入手,彻底有效地降低金属矿山的污染现状。     

矿山选矿药剂及重金属污染研究综述

矿产资源开发在满足日益增长的消费需求的同时给环境保护带来了巨大压力。分析了矿山选矿过程中使用的选矿药剂可能造成的污染，综述了矿区土壤和水体重金属污染机理及治理方法。矿山重金属污染治理应避免出现二次污染，未来应加强选矿药剂与重金属交互作用机理研究。     

广东省金属矿山的数量、类型、分布,以及导致的土壤重金属的污染状况

广东省地处岭南成矿带,矿产资源丰富。本文概述了广东省金属矿山的数量、类型、分布等方面,重点对金属矿山对其附近的土壤造成的污染进行阐述,并针对此状况提出了一些今后在金属矿山开发过程中的应对策略。     

磷矿选矿废水中浮选药剂的回收与水深度处理的研究

以国内某磷矿选矿废水为处理对象,采用“隔油—超滤—反渗透”工艺对其进行处理.研究发现,隔油工艺可有效回收水中近90％的浮选药剂,超滤膜可有效去除水中绝大部分与水发生乳化作用的浮选药剂,反渗透可进一步去除选矿废水中的残余浮选药剂和离子.实验结果表明,处理后的选矿废水,产水可以满足排放水的要求,同时回收了大部分的浮选药剂.     

矿区土壤重金属污染的化学修复治理研究进展

金属矿区及周边土壤重金属污染已成为严重的环境问题之一。目前,修复重金属污染土壤的方法很多,文章介绍了目前常用的两种化学修复技术,并对金属矿山重金属污染土壤的化学修复指出进一步发展方向。     

我国金属矿山固体废弃物处理与处置技术进展

在保护环境的倡导以及可持续发展战略目标的影响下,我国金属矿山固体废弃物的处理技术已经有了一定的基础与成绩,在以后的发展过程中,我们需要继续对此予以重视并不断改进我国金属矿山固体废弃物的处理技术。文章首先介绍了我国金属矿山资源的利用现状,然后从三个方面分析了我国金属矿山固体废弃物的处理方法。     

胶磷矿选矿工艺和药剂研究进展

通过搜集国内外近几年文献和课题组近年研究成果,系统总结了胶磷矿选矿工艺和药剂研究现状,并进行了评述。     

1982年无锡选矿学术报告会

报告会由江苏冶金研究所、江苏省冶金科技情报站、《国外金属矿选矿》编辑部联合召开,于5月25～30日在江苏无锡举行,160个单位250名代表出席。会议收到60多篇论文,涉及金属与非金属矿浮选、重磁选、光电选、药剂、节能、基础理论等方面,并交流介绍了国内外选矿厂节能经验和我国节     

矿山土壤环境污染与修复技术研究进展

随着工业化的发展,我国土壤环境污染现象不断加剧.土壤环境质量变化较大,土壤中污染物数量和种类不断增加,污染的地域和规模在逐渐扩大.文章主要通过金属矿山的开采方面阐述了我国土壤污染的现状.介绍了当前矿山土壤污染的一些修复技术,主要包括植物修复技术、生物修复技术和BS活性土壤生态修复技术等.同时针对我国土壤污染日益严重的状况,探讨了今后我国矿山废弃地土壤生态恢复工作的发展方向.     

《矿产综合利用》(季刊)一九八四年征订启事

报导内容;主要是国内矿产综合利用科学技术研究、生产成果及有关的综合地质评价、矿石物质组成、选冶工艺、选矿药剂、学术论文和经验总结。并开展矿产综合利用科学技术的学术讨论等。同时针对国内矿产综合利用现状的需要,选登有关译文。     

用于吸附贵重金属、有色金属、有毒金属及稀有金属的有机硅吸附剂

概述了有机硅吸附剂的结构、类型及其官能团的种类与被吸附元素的关系,详细介绍了用于吸附贵重金属、有色金属和有毒金属、稀土元素及放射性元素的有机硅吸附剂的官能团种类及其吸附特性,以及在化工废水、冶金污水、腐蚀性废水的无害化处理中的应用。     

金属预合金粉末与单质粉末在应用中的配伍特点研究

针对金属结合剂超硬材料工具常用单质Fe、Cu及预合金粉末的性能特点,结合生产实践,总结分析了其在生产实际中的应用特点及二者在配合应用过程中的配伍特性,从粉末的氧含量、粒度、形貌、松比的配合要求等方面开展了一些基本研究,阐述了二者协同作用时所应控制的一些基本要素,为单质及预合金粉末在生产实践中的应用提供了指导帮助。     

负载型金属催化剂表面金属分散度的测定

简要介绍了几种催化剂表面金属分散度的测定方法,包括静态化学吸附法、动态化学吸附法、X射线光电子能谱法(XPS)、X射线衍射宽化法(XRD)和透射电子显微镜法(TEM)。同时,对这几种方法的适用范围、局限性和测定结果的一致性进行了讨论和总结。     

Metal and metal oxide nanoparticle synthesis from metal organic frameworks (MOFs): finding the border of metal and metal oxides

Herein, for the first time, we report a generalized strategy for the successful synthesis of highly crystalline metal and metal oxide nanoparticles embedded in a carbon matrix by the controlled thermolysis of metal organic frameworks (MOFs). The rationalized synthesis strategy of a broad range of metal and metal oxides nanoparticles, such as Cu/CuO, Co/Co(3)O(4), ZnO, Mn(2)O(3), MgO and CdS/CdO, by thermolysis of MOFs demonstrates for the first time that metal ions with a reduction potential of -0.27 volts or higher present in MOFs always form pure metal nanoparticles during thermolysis in N(2), whereas metal ions with a reduction potential lower than -0.27 volts form metal oxide nanoparticles during thermolysis in N(2). Another point of interest is the fact that we have found a unique relationship between the nanoparticle size and the distance between the secondary building units inside the MOF precursors. Interestingly, the crystallinity of the carbon matrix was also found to be greatly influenced by the environment (N(2) and air) during thermolysis. Moreover, these nanoparticles dispersed in a carbon matrix showed promising H(2) and CO(2) adsorption properties depending on the environment used for the thermolysis of MOFs.     

Stability of supported metal and supported metal oxide combustion catalysts

Catalysts used for high-temperature combustion of light hydrocarbons must maintain high activity over long time intervals by avoiding excessive sintering and deactivation in the hot and corrosive combustion environment. The sintering resistance and chemical stability of catalytically active phases is a key technical problem that must be solved for the development of commercially viable combustion catalysts. All noble metals and transition metal oxides that are catalytically active rapidly sinter at temperatures required for high combustion rates. Advanced materials used in the development of stable catalysts include highly sintering-resistant hexaaluminate supports for dispersion of noble metals, chemically and thermally stable supporting oxides for active transition metal oxides, and single-phase, substitutionally activated, sintering-resistant complex metal oxides. This paper will review deactivating phenomena, such as sintering and vapor transport and assess recent progress in the development of durable combustion catalysts.     

Faradaic rectification study of the metal/metal ion reactions

The kinetic parameters for Ag⁺/Ag and Cu²⁺/Cu reactions at the equilibrium potential and in the absence of dc polarisation have been obtained using the faradaic rectification method at audio frequencies. The values of transfer coefficients, ion exchange current densities and apparent rate constants, obtained for the two reactions at 27°C using 1·0mM of each of the Ag⁺ and Cu²⁺ in 1·0M KNO₃, are respectively 0·22; 7·3mA/cm²; 3·6·10^?3 cm/s and 0·45; 10·7 mA/cm²; 1·1×10^?4cm/s. These data are comparable to those reported in the literature. For obtaining reliable and reproducible results for the studies with metal/metal ion reactions suitable experimental conditions have been described.     

In-situ TEM observation of internal metal inside metal filled carbon fiber

There has been a considerable amount of research on MFCNTs and MFCNFs; however, research on the behavior of the internal metal used in MFCNF under heating has been limited. Therefore, in this study, an MFCNF was heated and the behavior of the internal metal was investigated using in-situ TEM observations. The internal metal used in the MFCNF did not melt. It was supposed that the non-melting was because of the high pressure of the internal metal resulting from a difference in the coefficients of linear thermal expansion of the graphite wall of the MFCNF and the internal metal. The pressure of the internal metal was calculated; it was approximately 12 GPa when the MFCNF was heated at 1500 °C.     

Fracture of metal/polymer/metal assemblies: Viscoelastic effects

The purpose of this work is to link the polymer viscoelastic properties (especially its relaxation time) and the adhesive behaviour of steel/polymer/steel assemblies. A wedge test device developed in the laboratory allows one to introduce the wedge into the assembly at a controlled speed and to follow the crack propagation with a camera-equipped microscope. The adherence energy (calculated from the equilibrium crack length) and the crack propagation rate are measured for different wedge introduction rates. Polymer equivalent relaxation time is determined for each introduction rate according to the time-temperature superposition principle. Relations between adherence energy, crack propagation rate, and calculated equivalent relaxation time values are proposed. These quantitative relations confirm the major influence of polymer viscoelastic properties on the rate sensitivity of adhesive behaviour.     

Effects of metal source in metal substitution of lithium manganese oxide spinel

Usefulness of W substitution for improvement of battery performance of LiMn₂O₄ cathode was investigated. Small amounts of tungsten were incorporated into LiMn₂O₄ spinel instead of available Mn. For this purpose, two sources of tungsten (metallic W or WO₃) were examined. W concentration and source have significant influence on both morphology and electrochemical behavior of W-substituted LiMn₂O₄ spinels. W substitution of LiMn₂O₄ spinel can lead to the formation of uniform spinel particles and improved battery performance. Cyclic voltammetric behaviors of the samples were examined in an aqueous solution, and Li diffusion process was investigated for different cases. The best case was the LiW_0.01Mn_1.99O₄ spinel prepared from metallic W powder, as exhibits excellent rate capability, but better cycleability was observed for the LiW_0.01Mn_1.99O₄ spinel prepared from WO₃. This means that because of significant influence of the dopant source, this parameter should be chosen in respect with the desire improvement.