Exploring the potential of olivine-containing copper-nickel slag for carbon dioxide mineralization in cementitious materials

Water-quenched copper-nickel metallurgical slag enriched with olivine minerals exhibits promising potential for the production of CO_(2)-mineralized cementitious materials.In this work,copper-nickel slag-based cementitious material(CNCM)was synthesized by using different chemical activation methods to enhance its hydration reactivity and CO_(2) mineralization capacity.Different water curing ages and carbonation conditions were explored related to their carbonation and mechanical properties development.Meanwhile,thermogravimetry differential scanning calorimetry and X-ray diffraction methods were applied to evaluate the CO_(2) adsorption amount and carbonation products of CNCM.Microstructure development of carbonated CNCM blocks was examined by backscattered electron imaging(BSE)with energy-dispersive X-ray spectrometry.Results showed that among the studied samples,the CNCM sample that was subjected to water curing for 3 d exhibited the highest CO_(2) sequestration amount of 8.51wt%at 80℃and 72 h while presenting the compressive strength of 39.07 MPa.This result indicated that 1 t of this CNCM can sequester 85.1 kg of CO_(2) and exhibit high compressive strength.Although the addition of citric acid did not improve strength development,it was beneficial to increase the CO_(2) diffusion and adsorption amount under the same carbonation conditions from BSE results.This work provides guidance for synthesizing CO_(2)-mineralized cementitious materials using large amounts of metallurgical slags containing olivine minerals.

Process mineralogy of copper-nickel sulphide flotation by a cyclonic-static micro-bubble flotation column

In our study we investigated a refractory copper-nickel sulfide ore separation by using a cyclonic-static micro-bubble flotation column (FCSMC). The process mineralogy of the main products was studied. Using a scanning electron microscope-energy dispersive system (SEM-EDS) and an X-ray spectrometer the mineral category and content of samples were analyzed. By using a mineral liberation analyzer (MLA) the mineral liberation characteristics were revealed. It is shown that in roughing feed the monomers liberation degree of nickel pyrite and chalcopyrite take up 84.11% and 88.82%, respectively. In tailings, the lost nickel pyrite and chalcopyrite are mainly monomers. Therefore, strengthening the micro-fine particle recovery capacity is the key to increase recovery.

Processing Map of C71500 Copper-nickel Alloy and Application in Production Practice

The isothermal compression tests of C71500 copper-nickel alloy at different temperatures (1 073-1 273 K) and strain rates (0.01-10 s^-1) were carried out on Gleeble-3500 thermo-mechanical simulator.The real stress-strain data were obtained.On the basis of dynamic material model,the power dissipation was established.The peak efficiency of the power dissipation is 57%.At the same time,Prasad’s,Murty’s and Babu’s instability criteria based on Ziegler’s expectant rheology theory,and Gegel’s and Malas’s instability criteria based on Lyaponov’s function theory,were used to predict the unstable regions in the processing map.The maximum entropy generation rate and large plastic deformation principle are more in line with the hot deformation process of C71500 alloy,so the accuracy of Prasad’s instability criterion is much better.According to the obtained macro-crack and micro-metallographic structure morphologies,the temperature range of 1 098-1 156 K and the strain rate range of 2.91-10 s^-1,and the temperature range of 1 171-1 273 K and the strain rate range of 0.01-0.33 s^-1 are more suitable for the processing area of C71500 alloy.The accuracy of the above conclusions were verified by the forging of materials and the analysis of hot piercing tubes.The significance of this paper is to provide theoretical basis and technological conditions for hot-press processing of C71500 alloy.

Geophysical prospecting of copper-nickel deposits in Beishan rift zone, Xinjiang

The Beishan rift zone in Xinjiang Uygur Autonomous Region was formed due to strong activities of faults on the basement of the Tarim continental crust.Despite the fact that many geological research results of the rift zone have been achieved,only a few studies have been conducted on its regional geophysical characteristics.In this paper,the gravity and magnetic anomalies of the rift zone were highlighted through specific data processing of 1∶50000 high-precision aeromagnetic data and gravity data with a grid spacing of 2 km×2 km.Based on this,the geophysical evidence for the scope and internal structures of the Beishan rift zone was obtained for the first time.The distinct characteristics of magnetic and gravity fields in the areas to the north and south of the Beishan rift zone reveal that deep faults exist between the Beishan rift zone and the geological units on the southern and northern sides.Furthermore,the faults on the two areas contain the bidirectional thrusts and have flower-shaped structures according to the characteristics of the magnetic and gravity fields.The Beishan rift zone can be divided into two tectonomagmatic zones,namely the Zhongposhan-Bijiashan-Cihai-Baishanliang zone(the northern zone)and the Bayiquan-Qixin-Baishan zone(the southern zone).The northern zone can be further subdivided into three comet-shaped anomaly groups(tectonomagmatic areas),while the southern zone can be further subdivided into two tectonomagmatic areas.According to the characteristics of aeromagnetic anomalies and gravity field,19 mafic-ultramafic complexes were delineated.The known Pobei,Hongshishan,and Qixin complexes are all located within the inferred complexes,with estimates of total explored resources of Ni,Cu,and Au of 3×10^(6) t,10×10^(3) t and 10 t,respectively.The prospecting of high-grade copper-nickel deposits should focus on the periphery and deep parts of the known and inferred mafic-ultramafic complexes.Among them,the peripheral strata of the complexes specifically have great prospecting potential of large-scale high-grade copper-nickel deposits of magma injection type.Finally,this paper analyzed the application effects of the rapid airborne-ground-drilling synergetic exploration method in the prospecting of copper-nickel deposits in Qixin,Beishan,Xinjiang,which will provide references for further exploration of copper-nickel deposits in Beishan area,Xinjiang.

Structures, stabilities and magnetic moment of small copper-nickel clusters

This paper obtains the lowest-energy geometric structures and the electronic and magnetic properties of small CuNiN clusters by using all-electron density functional theory. The calculated results reveal that the Cu atom prefers to occupy the apical site when N ≤ 9 and for the clusters with N = 10, the Cu atom starts to encapsulate in the cage. The CuNi7 and CuNi9 are magic clusters. The magnetism correlates closely with the symmetry of the clusters. For these clusters, the charge tends to transfer from the nickel atoms to the copper atoms. It finds that the doping of Cu atom decreases the stability of pure NiN clusters.

The Inhibitive Effect of 3-Methyl 4-Amino 1,2,4 Triazole on the Corrosion of Copper-Nickel 70 - 30 in NaCl 3% Solution

The effect of 3-methyl 4-amino 1,2,4 triazole (MATA) on the corrosion behaviour of copper-nickel 70 - 30 (Monel) in NaCl 3% solution is investigated at 298 K by weight loss measurements, potentiodynamic polarisation and impedance spectroscopy (EIS′) methods. Preliminary screening of the inhibition efficiency (ECR) was carried out with using weight- loss measurements. Polarization measurements showed that the organic compound investigated is mixed type inhibitor (it acts on the cathodic and the cathodic reactions), inhibiting the corrosion of Monel by blocking the active sites of the metal surface. Changes in the impedance parameters charge transfer resistance (Rct) and double layer capacitance (Cdl) are related to adsorption of organic inhibitor of the metal surface, leading to the formation of protective film, which grows with increasing exposure time. Inhibition efficiencies obtained from cathodic Tafel plots, gravimetric and EIS methods are in good agreement. Results obtained shows that the (MATA) is good inhibitor for copper – nickel, and its efficiency reaches more than 95% at 60 ppm after 30 mn of immersion.

Nano-sized Mineral Phases in Copper-nickel Ores of the Central Pai-Khoi(Nenets Autonomous District,Russia)

The characteristics of previously determined and a number of new,unknown before,mineral phases are presented.On this area in sulphide ores of the Central the Pai-Khoi dolerite bodies.In the process of intrusion formation and sulphidic magma crystallization the subtraction of such elements as lead, stibium,cobalt,arsenic,and accordingly migration and concentration of minerals of platinum

A Genetic Model for Ore Magma of the Chibaisong Copper-Nickel Sulphide Deposit, Jilin

In the early 1980's, the author proposed his view that copper-nickel sulphide deposts are of ore magma origin. For more than ten years, this view has aroused attention of his colleagues at home and abroad. In this paper an attempt is made to deal with the genetic model for ore magma of copper-nickel sulphide deposits in more details on the basis of geological, geochemical, petrophysico - chemical and thermodynamic studies of the Chibaisong copper-nickel sulphide deposit in the Changbai Mountains, Jilin province.

GEOCHEMICAL CHARACTERISTICS OF PLATINUM GROUP ELEMENTS IN JINCHUAN SUPER-LARGE SULFIDE COPPER-NICKEL DEPOSIT, JINCHANG CITY, GANSU PROVINCE, CHINA

The platinum-group element geochemistry of rocks and ores from Jinchuan super-large copper-nickel sulfide deposit is systemically studied in this paper. The Cu/Pd mean ratio of Jinchuan intrusion is lower than that of original mantle magma, which indicates that these ultrabasic rocks were crystallized from magma that lost Pd in the form of melting segregation of sulfides. The PGE of the rocks show trend of partial melting, similar to that of mantle peridotite, which shows that magma formation occurs during rock-forming and ore-forming processes. The chondrite normalized PGE patterns of the rocks and ores are well related to each other, which signifies the signatures of multi-episode magmatic intrusion, melting and differentiation in the formation processes of rocks and ores. In addition, analyses about the relation between PGE and S, and study on Re-Os isotopes indicate that few contamination of the crustal substances occurred during the magmatic intrusion and the formation of deposit. However, contamination by crustal substances helps to supply part of the S for the enrichment of PGE. Meanwhile, the hydrothermal process is also advantageous for the enrichment of PGE, especially lbr Pt and Pd, due to deep melting segregation. The characteristic parameters （such as Pt/（Pt＋Pd）, （Pt＋Pd）/（Ru＋Ir＋Os）, Pd/Ir, Cu/（Ni＋Cu）, and so on.） for platinum-group elements for Jinchuan sulfide copper-nickel deposit show the same features as those for sulfide copper-nickel deposit related to basic magma, which also illustrates its original magma property representative of Mg-high tholeiite. Therefore, it is the marie （not ultramafic） magma that resulted in the formation of the superlarge sulfide copper-nickel deposit enriched in Cu and PGE. To sum up, the geochemical characteristics of platinum-group elements in rocks and ores from Jinchuan copper-nickel sulfide deposit are constrained by the continental rift tectonic environment, the parent magma features, the enriched mantel magma source, the complex metallogenesis and PGE geochemical signatures, and this would be rather significant for the study about the genetic mechanism of copper-nickel sulfide deposits.

尼龙6的络合与解络合

为了用超高分子质量尼龙6制备高强高模纤维,对超高分子质量尼龙6分子间的酰胺基氢键的屏蔽和再生进行了研究.以三氯化镓在硝基甲烷中络合超高分子质量尼龙6以屏蔽氢键,提高拉伸倍数;考察了水、氢氧化钠水溶液和乙醇对络合体系再生的效果;采用XRD、元素分析、DSC以及FTIR法对溶液体系和再生物进行了表征.结果表明:采用上述方法可以制得无定型三氯化镓-硝基甲烷-超高分子质量尼龙6络合物,超高分子质量尼龙6分子间的氢键被屏蔽,络合物薄膜能拉伸到近20倍;上述3种解络合剂对络合物解络合得到的再生物可以恢复其常规尼龙6的结晶性能.

铕-芳香羧酸-丙烯腈三元配合物的合成及发光性能研究

以对甲基苯甲酸、大茴香酸、间氯苯甲酸、苯甲酸和对羟基苯甲酸为第一配体,丙烯腈为反应型配体,合成了五种新的铕-芳香羧酸-丙烯腈三元配合物。通过元素分析,EDTA配位滴定分析,热分析,红外、紫外和荧光光谱分析对目标配合物的组成、结构进行了表征,并研究了它们的发光性能。结果表明,五种新的反应型铕三元配合物均具有良好的发光性能,各芳香羧酸向铕离子传递光能的能力为:对甲基苯甲酸>苯甲酸>间氯苯甲酸>对羟基苯甲酸>大茴香酸,将这些含反应型配体丙烯腈的发光铕配合物引入高分子化合物中可望合成出键合型铕高分子发光材料。

离子印迹技术及其在重金属污染治理和回收中的应用

综述了国内外离子印迹技术在金属离子污染治理和回收利用方面的研究现状和进展。对本体聚合、原位聚合、沉淀聚合、表面分子印迹技术、膜技术、微乳液聚合、原子转移自由基聚合等离子印迹聚合物的制备方法进行了比较、分析和总结,重点对离子印迹技术在重金属污染治理和回收利用方面进行述评。除了报道离子印迹技术在Cu^(2+)、Fe^(3+)、Hg^(2+)、Zn^(2+)、Cd^(2+)、U^(6+)等金属离子污染治理的成功案例外,还特别介绍了几种表面离子印迹聚合物制备采用的材料,如壳聚糖、硅胶、菌丝体。研究表明,与传统方法制备的聚合物相比,离子印迹聚合物的吸附容量和吸附速率大幅提高,尤其是离子印迹聚合物微球和表面印迹聚合物,对目标离子有突出的选择性。离子印迹聚合物因其可靠的机械稳定性、识别能力、易解吸和再生等性能,在离子分离、净化和回收领域已广为人们所接受,并为金属离子污染治理和回收的工业应用提供了技术基础。最后探讨了离子印迹技术研究领域面临的问题和趋势。

超声辐照法合成二氯苯基膦

以苯、PC l3为原料,以无水A lC l3为催化剂采用频率40 kHz、声压159 kPa下超声辐射合成二氯苯基膦。以NaC l作为A lC l3的络合剂,经2步反应合成二氯苯基膦。以石油醚作为萃取剂,减压蒸馏出萃取剂后,在1.33×103Pa(沸点为90℃)下,其馏分即为二氯苯基膦。反应4 h的产率达92.3%,比无超声处理的普通反应的收率提高6.6%,产品经气相色谱分析,纯度达99.7%。

聚乙烯亚胺与钴离子的络合行为

采用光谱法研究了聚乙烯亚胺(PEI)与钴离子在水溶液中络合的行为。研究了不同温度下水溶液中生成的PEI-Co络合物浓度随时间的变化,发现随温度升高,达到络合平衡所需要的时间缩短,而生成的PEI-Co络合物浓度增加。分别在钴离子或PEI中亚胺基过量的情况下,研究了PEI与钴离子络合的初始速率与亚胺基或钴离子浓度的关系,发现PEI与钴离子的络合反应对钴离子和PEI中亚胺基均是一级反应。求出了不同温度下PEI与钴离子络合反应和解络合反应的速率常数,以及络合反应的平衡常数。根据Arrhenius方程计算得到PEI与钴离子络合反应的活化能为21.2kJ·mol-1。基于Van’tHoff方程,求出了络合反应的摩尔反应焓和熵,其值分别为55.3kJ·mol-1和218J·mol-1·K-1。

复杂断块油藏地质建模难点及对策

复杂断块油藏的精确定量表征是目前储层地质建模技术发展的难点和研究热点。文中以枣园油田枣北构造孔一段枣Ⅱ油组复杂断块油藏地质建模为例,充分利用已有的地质研究、测井解释、地震解释等成果,以RMS软件为依托,将软件特有的建模技术手段与基础地质研究相结合,针对构造模拟、微相模拟及属性模拟中的难点提出了相应的研究对策,准确合理地将地质认识转化为约束条件,并综合应用多种方法对各阶段模型进行验证,有效解决了复杂构造、强非均质性储层建模的难点,提高了复杂断块油藏随机模拟精度,使所建模型接近地下地质实际,为该区下一步数值模拟研究和目标挖潜提供了可靠的地质依据。

次贷危机的系统科学分析

本文从梳理次贷危机的形成要素出发,运用系统科学的思想和方法对产生次贷危机的深层次原因进行讨论,分析透过次贷危机反应出来的世界经济系统的演化规律。本文认为基于信息技术的金融业过度发展强化了世界经济系统的复杂性,加大了世界经济系统的整体风险,而这种过度发展是当代国际经济分工的必然结果,这次次贷危机本身是当代国际经济新格局发展过程中的一次大调整。

对苯二酚铜、钴(Ⅱ)配合物的合成及表征

采用半固相法合成一水合对苯二酚铜(Ⅱ)和一水合对苯二酚钴(Ⅱ),分别用碘量法和EDTA滴定法测定配合物中铜、钴的含量,通过元素分析、红外光谱、紫外吸收光谱、荧光光谱表征两种配合物的组成.结果表明:采用半固相反应法可以合成一水合对苯二酚铜(Ⅱ)和一水合对苯二酚钴(Ⅱ),在两种配合物的荧光光谱中都出现2个激发峰和1个荧光发射峰,说明过渡金属的对苯二酚配合物可用做潜在的发光材料.

世界航空客运网络的节点度分布特征

根据世界航空客运的海量样本数据,以153个国家(地区)为节点,以国家(地区)间客运航线为边,建立了世界航空客运网络,并对其复杂性进行了分析。分别考察了世界航空客运网络复杂性的指标——路径长度、网络集聚系数和幂律分布系数。特别对客运网络度的分布特征进行详细考察,从无向、有向和点强度等三个方面探讨了该网络的度分布特征,证明它们均服从幂律分布,说明世界航空客运网络的度分布存在着较高的不均匀性,是一个无标度网络。

新型Gemini表活剂的合成及其降低油水界面张力性能

以胱氨酸钠和油酰氯为原料,通过1步反应合成了一种新型阴离子Gemini表面活性剂———二油酰胺基胱氨酸钠(Sodium dioleoylamino cystine,SDOLC),并利用界面张力仪研究了SDOLC降低油水界面张力性能。结果表明,利用地层水配制质量分数为0.10%的SDOLC溶液,可以在低碱质量分数下与大庆油田原油达到10-2mN/m量级的界面张力。Ca2+和Mg2+的存在使体系油水界面张力升高,络合剂羟基乙叉二膦酸四钠HEDP.Na4可以屏蔽Ca2+和Mg2+对界面张力的影响,增强体系的耐Ca2+和Mg2+能力,并降低碱剂的用量。

面向协同装配规划的信息模型研究

为解决复杂产品的装配设计团队和装配规划团队间的协同工作,提出了装配结点概念,用以集成描述产品装配信息,利用装配结建立了产品的装配联系图模型,通过图模型中顶点和边的属性,分别独立描述零件和装配信息。给出了一个基于割顶点的装配联系图层次分解算法,构建了基于共享零件的产品结构层次树模型。基于结构层次树模型,描述了协同装配规划中的协同工作信息。利用实例说明了面向协同装配规划的信息建模过程及模型的有效性。