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钴基合金电弧离子镀NiCrAlY涂层的组织结构和抗氧化性能 周宏明,易丹青,肖来荣,叶 云 (中南大学 材料科学与工程学院,湖南 长沙,410083) 摘 要:采用电弧离子镀方法在Co基高温合金K640基体上制备NiCrAlY涂层,研究电弧离子镀涂层和真空退火后涂层的形貌,相结构及抗氧化性能.研究结果表明:电弧离子镀NiCrAlY涂层主要由γ-Ni,γ′-AlNi3和β... and oxidation resistance of NiCrAlY coating deposited on Co-based high-temperature alloy by arc ion plating technology ZHOU Hong-ming, YI Dan-qing, XIAO Lai-rong, YE Yun (School of Materials Science......
P507-P204协同萃取分离镍钴王胜1,2,王玉棉1,赵燕春2,郭鹏成3(1.甘肃省兰州市兰州理工大学甘肃省有色金属新材料省部共建国家重点实验室2.甘肃省兰州市兰州理工大学有色金属合金及加工教育部重点实验室3.核工业北京化工冶金研究院,北京 101149)摘 要:采用恒温振荡器研究复配萃取剂P507-P204协同萃取分离镍钴的工艺.确定协萃最佳工艺条件为:有机相皂化率70%~75%,皂化时间15min;有机相组成为30%复配萃取剂(VP507∶VP204为4∶1)+65%磺化煤油+5%TBP;相比(VO/VA)为2/1;平衡时间15min;水相pH为2.在此条件下,钴的一级萃取率为87.62%.关键词:冶金技术； 镍钴分离； 协同萃取； 复配萃取剂； 溶剂萃取......
Study on ceria-modified SnO2 for CO and CH4 oxidation曾宪荣1,张荣斌1,徐香兰1,王翔1,21. Department of Chemistry, Nanchang University2. Institute of Applied Chemistry, Nanchang University摘 要:Sn-Ce-O binary catalysts with different Sn/Ce molar ratios were prepared with co-precipitation method and applied for CO and CH4 oxidation. The catalysts were characterized......
Study on ceria-modified SnO2 for CO and CH4 oxidation曾宪荣1,张荣斌1,徐香兰1,王翔1,21. Department of Chemistry, Nanchang University2. Institute of Applied Chemistry, Nanchang University摘 要:Sn-Ce-O binary catalysts with different Sn/Ce molar ratios were prepared with co-precipitation method and applied for CO and CH4 oxidation. The catalysts were characterized......
钴渣制备氢氧化高钴的试验研究杨志锋巴彦淖尔紫金有色金属有限公司摘 要:某锌冶炼公司湿法一,二期系统净化工序所产钴渣含钴低(Co4%~6%),含锌高(Zn10%~13%),直接外售不经济,拟将钴,锌从渣中分离,生产氢氧化高钴成品,以提高经济效益.公司经过多次试验确定了氧化焙烧-硫酸化焙烧-酸浸-双氧水氧化除铁-过硫酸铵氧化除锰-过硫酸铵氧化沉钴-沉钴后液除镍镉的工艺,较佳工艺条件全流程试验结果为:钴总回收率91.52%,锌总回收率90.66%;所得粗氢氧化高钴含钴50.69%,纯度94.56%,将此产品酸性洗涤除去锌镉可得到含Co(OH)3> 98%纯度的工业级氢氧化高钴成品;所得除镍,镉后液质量可达到返炼锌系统净化工序的要求.关键词:钴渣;氢氧化高钴;钴回收率;锌回收率;......
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焙烧-硫酸浸出铜,钴,镍,锌-萃取分离铜-碳酸钙中和除铁-P204萃取除锌-中和沉淀富集钴,镍-钴,镍渣酸浸-氟化铵除钙镁-P204萃取除杂-Cyanex272萃取分离镍,钴的工艺,实现了铜,钴,镍,锌等有价元素的综合回收,取得了铜回收率大于89%,锌回收率大于80%,钴回收率大于93%,镍回收率约74%的实验指标. 1 实验 实验用铜钴精矿的化学成分为(%):Co 1.27,Cu...溶液的萃取分离和提高Cu,Co,Ni,Zn的浸出率. 研究表明,采用硫酸化焙烧－焙砂浸出方案,可以实现铜,钴,镍,锌等有价元素的综合回收.该工艺的各单元操作均有工业应用的实践经验,工业化简单,工艺技术风险低,是一种比较合理和经济的处理工艺. 3 冶金工艺条件的选择 3.1 精矿价值组成分析 铜钴混合精矿中,最有回收价值的金属元素是钴,以此次试验处理的物料为例,1 t......
Oxidation behavior of oxidation protective coatings for C/C-SiC composites at 1 500 ℃ YAN Zhi-qiao(闫志巧)1, 2, XIONG Xiang(熊 翔)1, XIAO Peng(肖 鹏)1, CHEN Feng(陈 峰)1, ZHANG Hong-bo(张红波)1, HUANG Bai... prepared by chemical vapor deposition(CVD) alternated with slurry painting were applied on C/C-SiC composites, respectively. The oxidation of three samples at 1 500 ℃ was compared. The results show......
担体类型对钴基催化材料的CO加氢性能与活化能的影响邢宇,刘振新,薛莹莹,吴德鹏,方少明郑州轻工业学院材料与化学工程学院河南省表界面科学重点实验室摘 要:在450550℃的还原温度下,Co/ZnO催化材料存在2种结晶态钴物种.在空速为1 500mL/g催化剂·小时,总压为2.0 MPa,H2∶CO比为2∶1的反应条件下,对比了负载在路易斯碱性担体(ZnO)和路易斯酸性担体(γ-Al2O3)上的钴基催化材料的费托合成催化性能,发现不同酸碱类型的担体对钴基催化材料的CO加氢活性,产物选择性以及表观活化能均有显著的影响.关键词:钴;催化材料;复合材料;担体;CO加氢;......
J. Cent. South Univ. (2016) 23: 2999-3005 DOI: 10.1007/s11771-016-3363-y Oxidation and roasting characteristics of artificial magnetite pellets ZHANG Han-quan(张汉泉), LU Man-man(路漫漫), FU Jin-tao(付金涛... magnetite concentrate, artificial magnetite with more lattice defects and higher activity tends to be oxidized. And the artificial magnetite pellet at the temperature of 400 °C has the oxidation......
