定向爆破技术在沿空留巷中的应用

为解决平煤二矿煤层顶板坚硬而导致回采巷道围岩较难控制的问题，采用D型聚能管定向断裂爆破技术，通过理论分析定向断裂爆破技术原理、现场试验、钻孔窥视等手段，研究了D型聚能管定向断裂爆破技术对控制沿空留巷围岩变形中的积极作用，确定了平煤二矿沿空留巷中合理的爆破、装药等工艺参数，并进行了现场工业性试验。结果表明：采用D型聚能管定向断裂爆破技术可以达到定向爆破的目的，切顶预裂成缝效果良好，能够有效切断沿空留巷中的基本顶，提高巷道自身的承载力，保障动压影响期间留巷围岩稳定，提高沿空留巷支护的可靠性和安全程度，有利于安全生产，对于同类条件下矿井聚能预裂爆破参数的选择有一定的工程参考价值。     

川北某黑色页岩型铼矿工艺矿物学研究

通过矿相显微镜、扫描电镜、电子探针、X射线能谱元素面分析等多种手段综合研究了川北某黑色页岩型铼矿中铼的赋存状态。样品为黑色页岩,有机碳含量较高。粘土矿物总量为14.6%,黄铁矿含量16.2%,石英含量37.7%。样品具典型的粘土结构,矿物粒度微细。铼有两种赋存状态,一种呈类质同象形式赋存于黄铁矿内,另一种则以分散形式存在。典型黄铁矿测点Re平均含量为0.024%。黄铁矿是Re的重要载体矿物。建议通过浮选分离黄铁矿,从而实现Re的富集。      

焦化厂初冷器工艺冷却中余热的回收和利用

从某焦化厂初冷器的原生产工艺冷却过程入手,探讨了采用热水驱动型溴化锂制冷设备对初冷器高温段产生的废热进行回收的可行性,并对改造后的生产工艺冷却过程及溴化锂机组主要技术参数进行了分析,最后阐述了改造后所取得的实际节能效果。     

Room Temperature Ferromagnetism in Co-doped CuAlO2 Nanofibers Fabricated by Electrospinning

One-dimensional, diluted magnetic semiconductor nanofibers have attracted increasing attention for their unique magnetic properties, large specific surface area, and high porosity. These qualities lead to excellent performance in magneto-optical devices, magnetic resonance imaging, ferrofluids and magnetic separation. The purpose of this study is to fabricate P-type one dimensional CuAlO2-based diluted magnetic semiconductor nanofibers. First, we fabricated Cu Al0.95Co0.05O2 nanofibers with an average diameter of 1 μm with the electrospinning method. The annealed nanofibers were thermally treated at a temperature of 1 100 ℃ and then shrunk to a diameter of about 650 nm. We used X-ray diffraction measurements and Raman spectra to confirm that the Cu Al0.95Co0.05O2 nanofibers had a single impurity free delafossite phase. The X-ray photoelectron spectroscopy analysis indicates that Co was present in the +2 oxidation state, resulting in an room temperature ferromagnetism in the Cu Al0.95Co0.05O2 fiber. This contrasts with nonmagnetism in pristine CuAlO2 fiber. The coercivity(Hc) value of 65.26 Oe and approximate saturation magnetization(Ms) of 0.012 emu/g demonstrate good evidence of ferromagnetism at room temperature for Cu Al0.95Co0.05O2 nanofibers.     

一种氯磺化聚乙烯橡胶及其生产工艺

户外鞋底加工用轻质防滑型橡胶纤维复合材料