Thermodynamic Study on Process in Copper Converters(The slag-making stage)

The so-called Goto's model was modified by introducing a parameter of the oxygen efficiency from industrial trials, as well as the selected and newly re-assessed thermodynamic data. The application of the model to copper converters in Guixi Smelter has been carried out by the combination of thermodynamic calculations with the mass and heat balance using the plant data obtained in industrial trials for many heats. For the slag-making stage, good agreements have been reached betWeen the calculated and measured temperature, blowing time as well as the contents for main elements in the matte and the slag. Relativel}' large deviations for contents of Zn and Pb in the slag may be caused by the complex chemical composition of the real molten slag, which ma}; result in a large difference of γzn. and γPb,adopted with their real values. It is noted that the model can simulate the slag-making stage of copper converting process in industrial Pierce-Smith converters well.     

增强IVR有效性的堆内注水策略研究

熔融物堆内滞留（IVR）是一项核电厂重要的严重事故管理措施,通过将熔融物滞留在压力容器内,以保证压力容器完整性,并防止某些可能危及安全壳完整性的堆外现象。对于高功率和熔池中金属量相对不足的反应堆,若下封头形成3层熔池结构,则其顶部薄金属层导致的聚焦效应可能对压力容器完整性带来更大的威胁。本文考虑通过破口倒灌及其他工程措施实现严重事故下熔池顶部水冷却,建立熔池传热模型,分析顶部注水的带热能力,建立事件树,分析顶部注水措施的成功概率及IVR的有效性。结果表明,通过压力容器内外同时水冷熔融物,能显著增强IVR措施的有效性。     

一种少见的稀土矿物:斯坦硅石

斯坦硅石(Steenstrupine),又称菱黑稀土矿,是一种十分少见的稀土矿物,其化学式为Na14Mn2(Fe,Mn)2 REE6ZrSi12O36(PO4)7·3H2O,目前主要报道于格陵兰岛南部的伊犁马萨克地区和科罗半岛的罗沃泽洛和希比内.斯坦硅石富含铀和稀土,著名的伊犁马萨克岩体中斯坦硅石REO含量31.5％～44.9％,平均35.9％,以轻稀土为主,含少量重稀土,U3O8含量0.2％～1％,Th含量很高,为0.5％,是生产铀、锆、铪、稀土等更有潜力的矿物,具有较高的价值.斯坦硅石形成主要与高钠质碱性岩浆有关,形成于锆石之前,Na2O含量在0～14％,各向异性环晶Na含量高于晶核,表明矿物对Na的二次富集.自然界斯坦硅石产出的三种类型,反映斯坦硅石的形成需要一定范围的温度和压力.斯坦硅石易被独居石、铀钍石取代,其非均质环带边主要有原生和次生两种解释.     

LSGM固体电解质研究进展

综述了有关Sr、Mg掺杂镓酸镧(LSGM)固体电解质的研究进展,分析了LSGM的合成、结构及导电性,描述了LSGM基础上掺杂其他金属离子的研究结果,指出了存在的问题及今后研究的发展方向.     

Thermally tunable catalytic and optical properties of gold-hydrogel nanocomposites

We have developed a very simple approach for preparing physically embedded gold cores in a temperature-responsive hydrogel polymer nanoparticle under fluorescent light irradiation. The complete encapsulation of the multiple gold core nanoparticles is confirmed by the catalytic reduction of 4-nitrophenol, whose reactivity is significantly retarded above the lower critical solution temperature (LSCT) due to the deswelled polymer structure; its increased hydrophobicity slows the access of hydrophilic reactants to the cores. Since these gold cores are physically embedded in the polymer nanoparticles, further growth of the cores is reliably achieved in situ under light irradiation. Interestingly, the resulting composite nanoparticles exhibit reversible solution color changes as well as absorption bands from the visible to near-IR regions below and above the LSCT.     

Structural and electrical properties of La2−xBaxMo2O9−x/2 (x = 0-0.18)

La_2−xBa_xMo₂O_9−x/2 (x ≤ 0.18) have been prepared by solid state reaction method. The lattice parameter of La_2−xBa_xMo₂O_9−x/2 (x ≤ 0.18) determined by XRD data refinement shows a linear dependence on the dopant Ba content x. For the specimen with a La/Ba molar ratio of 0.18-0.2, additional reflection of secondary phase exists in the XRD pattern, so the value of solubility limit for Ba in La₂Mo₂O₉ is defined in range of 0.18 < x < 0.2. As the replacement degree of La³⁺ by Ba²⁺ increases, the bulk conductivity of La_2−xBa_xMo₂O_9−x/2 (x ≤ 0.18) decreases initially and then increases, a minimum value at La_1.9Ba_0.1Mo₂O_8.95 exists. Hebb-Wagner studies in argon atmosphere, which use an oxide-ion blocking electrode, show that La_2−xBa_xMo₂O_9−x/2 (x ≤ 0.18) are predominantly oxide-ion conducting in the temperature ranging from 773 to 1173 K. The average thermal expansion coefficient of La_1.84Ba_0.16Mo₂O_8.92 determined by high-temperature XRD was deduced as great as 17.5 × 10⁻⁶ K⁻¹ between 298 and 1173 K.     

四川某金矿选矿试验研究

为解决四川某金矿选厂对该地区金矿回收率较低的问题,对该金矿进行了全面的矿石性质分析研究,并根据矿石性质的特点研究了回收该矿石中有用矿物的最佳工艺流程方案,并进行了多方案选矿对比试验。通过柱浸试验、浮选试验、重选试验、全泥氰化浸出试验的选金工艺方案对比试验结果表明:该矿可浸性很好,浸出试验金浸出率大于97%,重选、浮选回收率较低,最终确定了氰化浸出工艺流程。该工艺流程简单,可操作性强,对该地区的金矿回收具有指导作用。     

The Wind Effect on the Transport and Burning of Firebrands

Firebrands, controlling spot fires, are often responsible for fast damages in wildland and urban fires. However, the behaviours of firebrands are difficult to predict. In this study, we conduct experiments in a wind tunnel to investigate the effect of wind on the smouldering burning and transport of firebrands. Three different sizes of disc wood particles (weighing about 1 g) are heated to generate smouldering firebrands, and then blown out by a horizontal wind of 5 or 7 m/s. In each experiment the transport distance (in the order of 1 m) and mass loss of firebrands are measured to examine their burning behaviours. For the first time, a bimodal distribution (burning and extinction modals) is observed for small firebrands under certain wind speeds (firebrands of 12-mm diameter and 5-mm thickness under a wind speed of 7 m/s in this work). Both the firebrand transport distance and mass loss in the extinction modal are smaller than those in the burning modal. The heat transfer analysis shows that there is a critical wind speed to quench the firebrand and produce a bimodal distribution, and its value increases with both the particle size and the heating duration. The predicted critical wind speed agrees well with experimental measurements.     

“一带一路”国家黑色金属、有色金属冶炼加工产业合作优选评价

"一带一路"倡议为我国企业走出去合作提供了良好契机。为了我国企业与"一带一路"国家更好地开展黑色金属、有色金属的产能合作,本文从投资环境、冶炼加工产业合作基础、市场需求前景以及地缘战略意义四个方面建立了三层冶炼加工产能合作优选评价指标。通过对各国各项指标对比赋值,利用特征值分析法,得到了"一带一路"沿线中的62个国家的评价结果,并将其分为最适宜投资国、较适宜投资国、一般投资国和谨慎投资国四类,以期为我国企业展开有利的产能合作提供指导。     

SiO_2与KH-560共同改性对水性UV木器涂料性能的影响

本文采用SiO_2和KH560对水性紫外光(UV)固化木器涂料进行共同改性,通过优化工艺参数制备了水性UV固化木器涂层,并对涂层的力学性能(硬度、附着力和耐冲击强度)和光泽度进行了测试。发现当KH560含量为3.0%,SiO_2含量在2.0%左右,烘干温度为40℃,干燥时间为10min,用2盏UV灯辐射1 min时,水性UV固化木器涂层力学性能(硬度、附着力和抗冲击强度)良好。但是当SiO_2含量高于3.0%时水性UV固化木器涂层的力学性能反而下降。光泽度结果表明,水性UV固化涂层的光泽度与SiO_2含量成反比。当SiO_2的含量位于2.0%左右,水性UV固化木器涂层的光泽度呈现亚光。