CaCl_2-CaF_2熔盐的CaO溶解度及吸水性能研究

采用不同真空脱水工艺制备了CaCl_2-CaF_2熔盐,对CaO在熔盐中的溶解度和熔盐吸水性能进行了研究。结果表明,随着熔盐脱水温度的升高、脱水时间的增加,熔盐中H_2O、CaO的含量逐渐降低,且表现出相同的变化趋势;熔盐中CaO的溶解度随着熔盐温度、溶解时间的增加逐渐增加,CaO在不同脱水工艺制备的熔盐中的溶解度有所差异,随着熔盐中H_2O含量的增加,CaO的溶解度逐渐降低;不同脱水工艺制备的熔盐表现出不同的吸水性能,熔盐中H_2O含量越低,吸水性能越强。     

尼龙11研究的发展与展望

综述了尼龙１１的合成与研究应用情况,并对尼龙１１的研究与发展提出了展望。     

Influence of grain-boundary pre-precipitation and corrosion characteristics of inter-granular phases on corrosion behaviors of an Al–Zn–Mg–Cu alloy

In this paper the influence of high-temperature pre-precipitation treatment on corrosion behaviors of 7055 aluminum alloy is investigated. High-temperature pre-precipitation treatment enhances the discontinuing distribution of the coarse precipitates along the grain boundary, and increases the Cu content of grain-boundary precipitates, which obviously improves stress corrosion resistance, suppresses the serve fracture of sub-grain boundary under the stress corrosion and reduces inter-granular corrosion (IGC) susceptibility with the same strength and ductility. The electrochemical corrosion results of inter-granular phases indicate that the Cu-rich, discrete and coarse grain-boundary precipitates and the decreasing potential difference among inter-granular phases in the grain boundary are responsible for the enhancement of corrosion resistance of 7055 alloy.     

内蒙古某复杂铅锌多金属矿浮选试验研究

对内蒙古某复杂铅锌多金属矿进行了详细的工艺矿物学研究,研究发现该矿石中矿物种类繁多,矿物间嵌布关系复杂,可回收有价金属元素为铅、锌、银,分别以方铅矿、闪锌矿、自然银和硫化银的形式存在;通过浮选试验研究得到最佳的工艺流程和药剂制度：磨矿细度-0.074mm占65%,铅回路粗选pH为10.7,硫酸锌和亚硫酸钠为锌抑制剂,BM-3为捕收剂,控制矿浆电位-320mv,精选2次,扫选2次;锌回路粗选pH大于12,硫酸铜为活化剂,丁基黄药为捕收剂,精选2次,扫选2次,闭路可得到铅品位68.81%,铅回收率90.76%的铅精矿和锌品位52.83%,锌回收率89.91%的锌精矿,其中铅精矿、锌精矿种银的总回收率为82.54%,优于生产指标,同时还大幅缩短了工艺流程。     

Finding Starting Points for Tracing Surface Intersections

To find starting points for all the intersection curves, one of the surfaces is subdivided into some small surface patches. Based on a correlative algorithm of computing the minimum distance of two surfaces, the intersections of every patch with another surface are detected, and starting points are calculated by dichotomy. This algorithm shows superior efficiency in the computational complexity and number of iterations needed. It can be used to determine exact starting points on all possible solution curves between any kinds of parametric sculptured surfaces.