Preparation and Electrical Resistance Characteristics of Electroless Copper-Nickel Alloy Deposits

Studies have been made of an electroless copper-nickel-phosphorus alloy from a citrate complex bath using hypophosphite as reducing agent and electroless copper-nickel binary alloy from a triethanolamine complex bath using formaldehyde as reducing agent. With an increase in copper content of alloy, the specific resistance of deposit decreased. The TCR of copper-nickel-phosphorus alloy increased remarkably because of the crystallization of Ni₃P after heat treatment. But the increase in TCR of copper-nickel binary alloy was moderate and not so striking as for the phosphorus containing alloy.     

高镁低品位铜镍矿氧压硫酸浸出液综合回收研究

针对高镁低品位铜镍矿氧压硫酸浸出液特点,提出“Lix984萃取提铜-MgO中和黄钠铁矾法沉淀除铁-MgO中和沉镍”综合回收工艺。结果表明,采用Lix984可选择性萃取99.79%的铜,其他金属离子基本不萃取,经模拟工业贫铜电解液反萃,铜反萃率达98.13%,得到富铜电解液,可电积制备金属铜; 萃铜余液通过MgO中和黄钠铁矾法沉淀除铁,铁沉淀率达99.20%,镍损失率仅0.60%; 沉铁后液通过MgO中和沉淀回收镍,镍沉淀率为99.91%,并得到镍含量24.13%的氢氧化镍粗产品; 沉镍后的高浓度硫酸镁沉淀后液,可用于回收镁。     

几种电磁屏蔽面料屏蔽效能的研究

选择铜镍涂层织物、银纤维交织织物、铜镍金属丝织物、不锈钢交织织物4种电磁屏蔽面料进行研究,利用同轴传输线法测试它们的电磁屏蔽效能。结果表明:材料中的金属丝比例越大,织物的电导率越大,电磁屏蔽效果越好。在金属丝含量相同的情况下,银丝的电磁屏蔽性能优于不锈钢。经洗涤后,银纤维交织织物和不锈钢交织织物的电磁屏蔽效果没有明显变化,而铜镍涂层织物和铜镍金属丝织物的电磁屏蔽性能均有明显衰减。     

内蒙古某低品位铜镍钴矿选矿试验研究

内蒙古某铜镍钴矿含铜0.17%、含镍0.28%、含钴0.021%,采用"粗磨丢尾—铜镍混合浮选—混合精矿再磨—铜镍分离"工艺流程。闭路试验获得了铜品位18.68%、回收率60.44%的铜精矿和镍品位4.52%、回收率74.42%的镍精矿,钴富集在镍精矿中,品位0.32%、回收率70.24%。     

Effect of nickel on combustion synthesized copper/fumed-SiO2 catalyst for selective reduction of CO2 to CO

In this study, we explore the effect of nickel incorporation in Cu/fumed-SiO₂ catalyst for CO₂ reduction reaction. Two catalysts, Cu and CuNi supported on fumed silica were synthesized using a novel surface restricted combustion synthesis technique, where the combustion reaction takes place on the surface of the inert fumed-SiO₂ support. An active solution consisting of a known amount of metal nitrate precursors and urea (fuel) was impregnated on fumed silica. The catalyst loading was limited to 1 wt% to ensure localized combustions on the surface of fumed-SiO₂ by restricting the combustion energy density. The synthesized catalysts were tested for CO₂ hydrogenation reaction using a tubular packed bed reactor between temperature 50°C and 650°C, where Cu/SiO₂ showed high CO₂ conversion to carbon monoxide, and the addition of Ni further improved the catalytic performance and showed some tendency for methane formation along with CO. Moreover, both the catalysts were highly stable under the reaction conditions and did not show any sign of deactivation for ~42 hours time on stream (TOS). The catalysts were characterized using X-ray diffractometer (XRD), scanning electron microscope/energy dispersive X-ray spectrometer (SEM/EDX), transmission electron microscope (TEM), and the Brunauer-Emmet-Teller (BET) surface area measurement technique to understand their structural properties and to assess the effect of CO₂ conversion reaction. In situ DRIFTS was also used to investigate the reaction pathway followed on the surface of the catalysts.     

高磁黄铁矿含量型硫化铜镍矿选矿试验研究

针对某硫化铜镍矿石磁黄铁矿含量高、铜镍品位低、嵌布粒度细的实际, 自主研发了适应该矿物浮选的高效选择性组合抑制剂及“铜镍硫混浮-精矿分离硫”新工艺。新药剂和新工艺闭路试验获得了铜品位2.69%、镍品位7.54%、铜回收率77.52%、镍回收率77.87%的铜镍混合精矿, 硫精矿硫品位34.25%。     

青海某铜镍多金属硫化矿工艺矿物学研究

本文研究了青海某铜镍多金属矿物的工艺矿物学。结果表明,矿石中铜镍为有回收价值的金属,铜矿物主要为黄铜矿,镍矿物主要为镍黄铁矿,脉石矿物主要为蛇纹石、滑石等矿物,选择-0.074 mm 70%作为较佳磨矿细度可以保证各有用矿物的单体解离。该研究对于选别铜镍多金属矿有一定的指导意义。     

广西某低品位铜镍矿石选矿工艺研究

广西某低品位铜镍矿石含铜0.25%、含镍0.43%,镍主要以镍黄铁矿形式存在,铜主要以黄铜矿形式存在,铜、镍矿物均有一定程度氧化且关系密切。为了给该矿石的开发利用提供依据,对其进行了选矿工艺研究。通过对优先浮铜再浮镍方案、铜镍混合浮选方案、铜镍混合浮选再分离方案以及磁选-铜镍混合浮选方案的对比,决定采用铜镍混合浮选方案处理该矿石。按该方案进行详细的试验研究,结果表明,在-0.074 mm占74%的磨矿细度下,以碳酸钠为矿浆调整剂、丁黄药为捕收剂、2号油为起泡剂,经1粗选2扫选2精闭路浮选,可获得铜品位为5.77%、镍品位为8.31%、铜回收率为86.33%、镍回收率为76.60%的铜镍混合精矿。     

铜镍硫化矿浮选精矿降镁研究进展

我国铜镍矿石资源主要为富含MgO硅酸盐脉石矿物的低品位硫化矿。浮选是实现铜、镍金属富集的主要途径,然而浮选精矿普遍存在MgO含量过高的问题。闪速熔炼要求MgO含量必须低于6.5%,精矿中高含量的MgO会导致冶炼炉温升高、炉渣粘度增大、炉子结瘤、渣相分离困难,导致回收率降低和冶炼成本增加。对此,国内外科研人员做了大量研究,但是普遍存在降低镁含量的同时铜镍损失率过大的问题,降低铜镍硫化矿精矿中镁含量一直是选矿的技术难题。本文就国内外铜镍硫化矿浮选精矿降镁研究进展进行了总结概述,分析了降镁机理并提出了发展趋势。     

抑制剂CMC在青海某硫化铜镍矿浮选中的应用

青海某硫化铜镍矿滑石化强蚀变现象较多,脉石矿物以辉石、橄榄石、滑石等钙镁硅酸盐矿物为主,浮选过程存在混合精矿镍、铜品位较低,氧化镁含量偏高的问题。针对这一问题,试验研究采用CMC为抑制剂使镁硅酸盐矿物得到了很好的抑制,确定精选添加CMC用量为300g/t,闭路试验获得了精矿镍、铜品位分别为5.94%、1.18%,回收率分别为82.23%、79.93%的选别指标,氧化镁含量从优化前的15.05%降至2.93%。