Plastic-containing materials as alternative reductants for base metal production

Shredder residue materials are produced after the removal of ferrous and non-ferrous fractions from end-of-life electronic equipment. Despite the high plastic content and metal value in the ash, high percentages of these materials are currently sent to landfills. In this study, the potential of utilising shredder residue material and other plastic-containing materials as reducing agents was studied. Plastic-containing materials were co-injected with coal into a zinc-fuming furnace in Boliden-Rönnskär smelter. The data obtained from the trial, such as the data from the chemical analysis of the slag and the steam production, are discussed. The observations indicate that plastic-containing material can replace up to 1?ton?h^?1 of coal without a significant decrease in the zinc reduction rate.     

电感耦合等离子体原子发射光谱法在钒钛磁铁矿中钒化学物相分析中的应用

钒钛磁铁矿中钒的化学物相分析一般测定硫化物中钒、钛磁铁矿中钒、硅酸盐中钒和钛铁矿中钒共4项。其中硫化物中钒利用强氧化剂分离,钛磁铁矿中钒利用其强磁性磁选分离,硅酸盐中钒利用氟化铵-硝酸分离,最后从残渣中得到钛铁矿中钒,使用电感耦合等离子体原子发射光谱法(ICP-AES)测定钒。试验对钒钛磁铁矿中钒的相态划分进行了统一,对各相态浸取溶剂进行选择及优化,确定分析谱线并计算检出限。按照实验方法测定3个矿区钒钛磁铁矿中总量钒和各相态钒,总量钒和钛磁铁矿中钒的测定结果与分光光度法测定值相一致;各相态钒测定结果的相对标准偏差(RSD,n=12)大部分在5%以内。各相态钒加和与总量钒进行比较,相对偏差在5%以内,满足《地质矿产实验室测试质量管理规范》要求。     

Catastrophic Evolution of Water Inrush from A Water-Rich Fault in Front of Roadway Development: A Case Study of The Hongcai Coal Mine

Mine Water and the Environment - A fault can be both the inrush channel and the water source. In order to better understand how such a mine disaster develops, a fluid–solid coupling analysis...     

Improved Input and State Estimation for Linear Stochastic Systems with Direct Feedthrough

This paper is concerned with the problem of joint input and state estimation for linear stochastic systems with direct feedthrough. Based on the fact that each unknown input between any two time steps is always bounded, a novel improved algorithm is proposed. Compared with existing results, this algorithm can effectively enhance estimation accuracy. Moreover, the stability of the algorithm is also discussed. Finally, an illustrative example is given to demonstrate the effectiveness of the proposed approach.     

地浸铀矿山浸出速度的影响因素

在地浸铀矿山生产过程中,铀的浸出速度是制约生产的重要参数,直接关系到矿山的服务年限。矿山生产采区往往存在严重的拖尾现象,为提高地浸铀矿山资源利用率,降低生产成本,研究了影响铀浸出速度的因素,提出了控制铀浸出速度的措施。     

基于等切共轭的弧齿锥齿轮差曲面建立与解析

对弧齿锥齿轮提出了一种新的共轭求解方法，来更方便地求解共轭小轮的齿面方程，在此基础上进行了齿面接触分析。在分析过程中提出了一种新的ease-off差曲面计算方法，即用对应点的转角误差替代直线误差进行差曲面求解，使得传动误差解析、齿面修形量的确定更为直观和准确。提取了ease-off曲面上的差曲线，以方便地确定出接触路径和边缘接触点。根据全程差曲线得到了齿面接触印痕分布情况。     

Polyoctadecylacrylate (POA) and resin-stabilized asphaltene synergistically improve the flow behavior of model waxy oils

In this paper, the effect of POA PPD together with resin-stabilized asphaltenes on the flow behavior of model waxy oils was investigated through rheological test, DSC, microscopic observation and asphaltenes precipitation test. Compared to the POA or asphaltenes alone, POA/asphaltenes cannot further decrease the wax appearance temperature of oils, but can dramatically decrease the pour point, gelation point, G′, G″ and apparent viscosity of oils. POA molecules can adsorb on the surface of asphaltenes, thus inhibiting the asphaltenes precipitation and forming the POA/asphaltenes composite particles. The composite particles can act as wax crystallization templates and then greatly change the wax crystals' morphology into large and spherical-like, thus improving the waxy oil flow behavior.     

探究智能变电站的继电保护二次回路故障诊断问题

本文即针对当前智能变电站中的故障诊断问题展开分析,主要以继电保护二次回路故障检测为主,就诊断检测系统进行阐述,总结了能够针对各种故障问题进行检测手段,意在能够借此提升变电站的智能化发展水平。     

基于特征贡献率的机械故障分类方法

为了使7075铝合金薄壁件表面喷丸加工应力得到松弛和均化，运用ANSYS建立平台式振动时效有限元模型，通过振动模态和谐响应分析，获得最佳激振频率和试样装夹位置。在此基础上，将薄壁框架件置于平台上进行振动时效处理，以验证仿真分析结果，评价其对试样表面应力作用效果。结果表明：在亚共振频率为112 Hz时，试样在平台零振幅和最大弯曲位置处分别对称布置，时效后表面均形成应力松弛，松弛率分别为29.5%和33.3%，不均匀波动分别为20.3%和20.7%，而沿振动方向松弛程度不均匀，说明激振力造成了材料表面组织屈服，且屈服程度与应力强度有关。提出再时效-位置交叠方法，使应力松弛不均匀度分别下降到9.9%和15.9%，应力均化得到改善，该研究工作为薄壁类零件表面应力均匀化提供了参考。     

煤层软硬分层吸附瓦斯性能差异性及其对瓦斯赋存的影响

为研究煤层软、硬分层吸附瓦斯性能差异性及其对瓦斯赋存的影响,分析了煤层内软分层的形成机理及结构特征,采集了我国多个煤与瓦斯突出矿井的煤样作为试验对象,应用高压容量法开展了软、硬分层煤样吸附瓦斯性能参数的对比试验,探讨了软煤、硬煤吸附性能的差异性。在此基础上,对煤层软、硬分层吸附瓦斯性能差异性与瓦斯赋存特征之间的关联进行了研究,结果表明:试验煤样软分层的极限吸附量均大于硬分层;随着瓦斯压力的增加,试验煤样软、硬分层瓦斯含量的差值逐渐增大,其曲线的变化特征与Langmuir方程类似,并且软、硬分层瓦斯含量数值的差异主要由吸附量差值构成;煤层软、硬分层吸附瓦斯性能的差异不仅对煤层原始瓦斯赋存特征有着显著的影响,同时还将影响煤巷掘进、瓦斯抽采过程中煤体内瓦斯流场的分布规律,需要根据煤层软、硬分层的组合特点,制订切实有效的瓦斯抽采技术方案。