以辉锑矿为原料放电等离子烧结快速制备黝铜矿Cu12Sb4S13及反应机理

采用辉锑矿为原料成功制备出Cu12Sb4S13块体.研究以Sb2S3矿物为原料时烧结工艺对Cu12Sb4S13合成的影响.在400～440℃温度区间内均可快速合成Cu12Sb4S13块体且二次烧结能够进一步减小中间相CuSbS2和Cu3SbS3.第二相Cu3SbS4和残留相CuS随着烧结时间的延长而降低.二次烧结前进行机械化球磨处理,干磨比湿磨更容易减小残留相.初次烧结块体的断面SEM和EDS能谱分析表明内部存在Cu或Cu2S颗粒团聚现象.适当降低Cu或CuS摩尔量(化学计量比0.1 mol)能促进烧结块表面反应进行.烧结过程中,硫磺蒸汽压的导致烧结块表面成分和内部粉末的成分不同.     

放电等离子烧结制备超细碳化钨材料

采用超细WC粉末及放电等离子(SPS)烧结工艺,制备了无粘结相硬质合金材料,并对材料密度、维氏硬度、组织形貌等进行了分析.结果表明,在1700℃的烧结温度下可制备出密度15.626g/cm3、维氏硬度为2720kg·f/mm2的无粘结相硬质合金材料.     

烧结温度对放电等离子烧结法制备IGZO靶材 的影响研究

以预烧结复合粉体为原料, 采用放电等离子烧结(SPS)方法制备IGZO靶材, 并采用密度测定、XRD、SEM等手段对不同烧结温度条件下的靶材结构性能进行了表征分析。结果表明, 在一定的烧结温度区间, 随烧结温度升高, 烧结体相对密度增加, 体积电阻率降低, 烧结温度1 100 ℃条件下烧结体的结构性能较好, 相对密度97.44%, 体积电阻率3.66 mΩ/cm³。     

放电等离子烧结制备纳米SiC_p/Al复合材料及组织性能研究

以微米级、纳米级碳化硅(SiC)颗粒和纯铝(Al)粉为原料,通过高能球磨+放电等离子烧结(SPS)工艺制备了不同质量分数的SiC颗粒增强Al基复合材料(SiC_p/Al),研究了SiC颗粒尺寸和含量对复合材料组织性能的影响。结果表明:高能球磨能促进增强颗粒的均匀分布,放电等离子烧结具有烧结温度低、保温时间短的特点,可有效减少甚至避免基体与增强体有害反应的发生。纳米级SiC增强铝基复合材料的颗粒团聚趋势较大,复合材料致密度较低,但是其细晶强化和Orowan强化效果显著,包含源缺陷和源裂纹较少,因此,复合材料硬度和屈服强度相应提高。     

Process development for the separation of tetrahedrite from chalcopyrite in the Neves-Corvo ore of Somincor S.A., Portugal

In the Somincor Neves Corvo ore, antimony occurs in the tetrahedrite-tennantite series of minerals while copper occurs in chalcopyrite and in other minerals present in minor quantities including the tetrahedrite-tennantite series. Current processing strategies do not directly address the control of antimony contamination of the final copper concentrate. The focus of this paper is to report initial findings of a major investigation undertaken on both a plant and laboratory scale.It was found that both collector type and concentration significantly affected copper/antimony selectivity. In particular, staged addition of dithiophosphate collector was required to control tetrahedrite flotation during copper roughing. However, size by size analysis showed that tetrahedrite flotation increased during scavenging due to further collector addition which was required to recover coarser chalcopyrite bearing particles. The production of separate rougher and scavenger concentrates enriched in chalcopyrite and tetrahedrite respectively, became an attractive option.It was found that oxidative treatment was required to adequately control tetrahedrite flotation. This treatment was applied to a final, low volume concentrate stream containing large quantities of tetrahedrite.In order to further enhance selectivity, fundamental work is aimed at establishing the relative ease of oxidation of chalcopyrite and tetrahedrite as well as the influence of oxidation: on the stability of the adsorbed hydrophobic species. A fiowsheet embracing these various concepts is proposed.     

锂离子电池负极材料Li4Ti5O12的制备工艺研究

本文主要研究了不同锂源、钛源制备Li4Ti5O12的反应过程,同时对不同制备工艺合成材料的晶体结构进行分析.研究结果表明:采用Li2CO3和微米级锐钛型TiO2制备的Li4Ti5O12为单一相的面心立方尖晶石结构,煅烧工艺条件为600℃保温8h,研磨后,800℃保温2h,该条件还有待于材料电性能测试结果的进一步验证.     

新型矿用聚氨酯弹性体密闭堵漏材料的反应机理及应用

分析了新型矿用聚氨酯弹性体密闭堵漏材料的组成、反应机理、性能及应用效果.     

Distribution of Sb minerals in the Cu and Zn flotation of Rockliden massive sulphide ore in north-central Sweden

The Rockliden massive sulphide Zn–Cu deposit contains minor amounts of Sb minerals. The Sb mineralogy is complex in terms of composition, micro textures and mineral associations. The main Sb minerals comprise tetrahedrite, bournonite, gudmundite and Sb–Pb sulphides such as meneghinite. The presence of these minerals is especially critical to the quality of the Cu–Pb concentrate. To study how they are distributed in a simplified flotation circuit and what controls their process behaviour Sb-rich drill core samples were selected from the Rockliden deposit and a standard laboratory flotation test was run on the composite samples. Scanning electron microscope-based automated mineralogy was used to measure the Sb mineralogy of the test products, and the particle tracking technique was applied to mass balance the different liberation classes to finally trace the distribution of liberated and locked Sb minerals. The mineralogical factors controlling the distribution of Sb minerals are mineral grain size, the degree of liberation, and associated minerals. Similarities in the distribution of specific particle types from the tested composites point towards systematics in the behaviour of particles and predictability of their distribution which is suggested to be used in a geometallurgical model of the deposit.     

工业偏钛酸为原料制备H2TiO3 锂离子筛及其吸附性能研究

层状偏钛酸(H2TiO3,简称HTO)因具有高的理论吸/脱附容量(127.27 mg/g)、对环境友好和低成本等优点,被认为是最有发展前景的液相提锂用锂离子筛(LIS).本文采用工业偏钛酸为原料制备了高性能锂离子筛,并对其进行造粒成型,有利于其工业化应用.利用X-ray粉末衍射仪、场发射扫描电子显微镜和火焰光度计对合成...     

论煤矸石烧结空心砖原料制备和码烧生产工艺的技术特点

利用煤矸石烧结空心砖是利用煤矸石这种工业废料最彻底、用量最大、最稳定的途径。在各地煤矸石空心砖的生产中存在着这样或那样的差异 ,但也存在着共同的规律。本文从生产实践经验出发 ,通过对大量的数据分析说明了煤矸石烧结空心砖原料制备和码烧生产工艺中的技术特点。提出了窑炉系数Υ的新概念 ,并论述了与煤矸石发热量的相关关系 ,对煤矸石空心砖生产厂的技术管理设定了新的衡量控制指标     

锂离子电池新型负极材料Li4Ti5O12的研究现状与进展

介绍了锂离子电池新型负极材料Li4Ti5O12的晶体结构和嵌锂特性,对Li4Ti5O12的制备方法以及掺杂、表面包覆改性研究结果进行了详细地总结和评论,最后展望了Li4Ti5O12今后发展的趋势.     

Utilization of humic acid as a depressant for hematite in the reverse flotation of iron ore

In the present work the utilization of humic acid as a depressant for hematite in the iron ore flotation process was studied taking into consideration its physicochemical properties. Contact angle measurements of hematite and quartz were performed using a computer controlled Ramé-Hart goniometer. After conditioning with humic acid at pH 10.2, at low dodecylamine concentrations, hematite presented a much lower contact angle as compared to that of quartz under the same conditions.Microflotation tests were carried out using an EMDEE flotation apparatus. Initially, the two minerals were studied individually. The results showed that, depending of the humic acid and dodecylamine concentrations, the floatability of quartz was higher than 90% and 61% of the hematite was depressed. The flotation of the mixture of the two minerals (25% quartz and 75% hematite) was subsequently studied. The hematite recovery was higher than 90% in the depressed concentrate which assayed 86.0% Fe₂O₃. The results suggest that humic acid could be used as an alternative for starch in the iron ore flotation process.     

Synthesis of 2-ethyl-2-hexenal oxime and its flotation performance for copper ore

A novel collector 2-ethyl-2-hexenal oxime was synthesized from 2-ethyl-2-hexenal and hydroxylamine hydrochloride. The yield of oxime was 78.05% under the optimum experimental conditions. The oxime was characterized by elemental analysis, infrared spectrum, mass spectrum, ¹H NMR and ¹³C NMR spectroscopy. The results of ultraviolet spectrum showed that the oxime exhibited stronger reaction affinity with Cu²⁺ than with Ni²⁺ or Fe³⁺, etc. Infrared spectroscopic analysis implicated that the oxime bound to Cu²⁺ through both the CC and CN groups. Microflotation tests of pure malachite mineral and chalcopyrite mineral indicated that the recovery of chalcopyrite was 91.16% under the flotation condition of rougher pH 10 and collector concentration of 200 mg/L, and the recovery of malachite reached 90.56% under the flotation condition of rougher pH 11.5 and collector concentration of 250 mg/L. The results of flotation tests of sulfide–oxide copper from Dexing copper mine showed that 2-ethyl-2-hexenal oxime achieved an excellent mean concentration containing 4.52% Cu with 79.54% Cu recovery, and the Cu average recovery increased by 2.35% compared to that of butyl xanthate.     

纳米Al2O3/Cu复合材料的制备及其摩擦学特性

首先采用化学镀铜工艺制备了Cu包覆纳米Al₂O₃复合粉体,分析了预处理工艺和化学镀工艺对复合粉体的组成及形貌的影响;再将均匀包覆的复合粉体与铜粉充分混合后,利用热压烧结成型工艺制备了纳米Al₂O₃弥散强化铜基复合材料,并对质量分数为2.5%的纳米Al₂O₃铜基复合材料的微观组织、摩擦磨损性能进行了研究.结果表明:通过镀前预处理工艺及对传统镀液配方的调整,成功地在纳米Al₂O₃颗粒表面包覆了厚度均匀可控的镀铜层,从而提高了纳米Al₂O₃颗粒与铜基体间的界面结合力,并实现了纳米Al₂O₃颗粒在复合材料基体中均匀分布.采用化学镀铜包覆技术制得的纳米Al₂O₃/Cu复合材料有较好的抗摩擦磨损性能,复合材料的摩擦因数较小,其相对耐磨性与钝铜相比提高了近1倍.