用磷石膏生产建筑材料的新进展

针对湿法磷酸副产的磷石膏在建筑材料中的应用及其国内外进展，介绍了用磷石膏制高强度砌块的中间试验流程，并指出在磷石膏中搀入其他材料，采用特殊复合工艺，可生产出新型功能性建筑材料，如石膏基导电材料和石膏基磁性材料等这不仅拓展了石膏的用途，又可获得巨大的经济效益。     

气体控制参数对气体辅助成型产品翘曲的影响

从气体辅助注射成型工艺的角度探讨了气体的延迟时间和第一段压力这两个关键的参数对槽的影响进而对产品翘曲变形的影响，结果表明：虽然通过使用气体辅助注射成型技术能改善产品变形，但并不能完全消除变形；造成产品变形的原因和机理十分复杂，只有进行从设计到工艺的全方位考察才能有效的控制变形，气体手指效应也是造成产品变形的一个重要因素，工艺上可以通过调整延迟时间和气体压力来减小产品的变形量。     

骨架材料对全钢载重子午线轮胎性能的影响

讨论骨架材料的规格、结构分布及工艺控制对全钢载重子午线轮胎性能的影响。胎体帘布采用带有外缠丝的 3 + 9+ 15× 0 2 2 + 0 15规格钢丝、胎体帘线密度在 45 0～ 65 0根·m- 1 范围内 (帘线直径大于 1 2mm)以及胎体反包端点在成品外轮廓曲线的第 2或 3条装配线上等措施均有利于保证胎体强度 ;合理设计带束层结构 ,端点与胎侧肩部花纹距离取 10mm左右有利于消除应力过度集中 ;采用钢丝增强带有利于提高胎圈刚性。     

低熔点合金填充聚合物材料断口形貌研究

研究了合金元素、加工温度、金属含量、第三组分对低熔点金属填充聚合物材料断口形貌的影响。实验结果表明:不同的合金对体系的影响很大,低分子量、低结晶性聚合物,高的成型加工温度可提高材料的相容性。     

普钙产品转化率的数值计算方法

对影响普钙产品转化率的各种因素进行了分析,利用MATLAB 软件包得到了转化率的计算公式,提出了确定未分解磷矿的比例和由倍半氧化物引起的有效磷退化幅度的方法,为生产系统的预测和调整提供了一种途径。     

金平水电站坝型比选研究

根据金平水电站坝址的水文气象和地形地质条件等基本资料,对砾石土心墙堆石坝和沥青混凝土心墙堆石坝进行技术经济比较。沥青混凝土心墙堆石坝防渗土料工程量小,施工环节少,占用土地少,环境影响小,施工技术成熟,工程投资省745万元,故采用了沥青混凝土心墙堆石坝方案,金平水电站已投产发电,运行良好。     

On the behaviour of tin-containing species in cryolite–alumina melts

Tin oxide (SnO2) dissolves in cryolite–alumina melts forming tetravalent tin species, but under reducing conditions it is reduced to divalent tin and, further, to metallic tin. Freezing point depression data for SnF2 and SnO in molten cryolite (Na3AlF6) corresponded to the formation of one and two new particles, respectively. By anodic dissolution of tin into cryolite-alumina melts divalent as well as tetravalent tin was formed, depending on current density and composition. During electrolysis of SnO2-based oxygen-evolving anodes, the condensate above the melt contained both divalent (SnF2) and tetravalent (SnO2) tin species.     

HT-730改性酚醛-丁腈胶粘剂的研制

对酚醛-丁腈胶粘剂进行改性，添加5．0％的硅烷偶联剂，改善了酚醛-丁腈胶粘剂的工艺性能，提高了粘接强度，特别是降低了酚醛-丁腈胶对环境湿度的敏感性。研制的HT-730胶在环境湿度90％时仍有很高的粘接强度，同时老化性能和适用期并没有受到影响。     

Phase Assemblages of Pr α-sialon Derived from SHS-ed Powders and TEM Study on the Nucleation of Pr α-sialon

The Pr α-sialon powders prepared by self-propagating high-temperature synthesis (SHS), consisting of 55 wt% Pr α-sialon and 45 wt% of β-sialon (abbreviated as α' and β'), were hot-pressed at 1800°C for 1 h. The results showed that Pr α' phase would transfer to β' with the appearance of JEM phase (Pr(Si_{6− z} Al _z )(N_{10− z} O _z )) after sintering, thus resulting in the increase of β' phase to 86 wt%. The addition of Y₂O₃ into SHS-ed Pr α' powders as the starting materials restrains the transformation of α' to β' and prevents the formation of JEM phase as well. The nucleation mechanism of Pr α' grain during hot-pressing was investigated in terms of transmission electron microscope and energy-dispersive spectrometer analysis. Two nucleation modes of Pr α' grains were found, i.e., nucleating on the undissolved Pr α' grains and on the nuclei of (Pr, Y) α' grains precipitated from liquid phase.     

Flow regime, hydrodynamics, floc size distribution and sludge properties in activated sludge bubble column, air-lift and aerated stirred reactors

This paper presents a comparative study how reactor configuration, sludge loading and air flowrate affect flow regimes, hydrodynamics, floc size distribution and sludge solids-liquid separation properties. Three reactor configurations were studied in bench scale activated sludge bubble column reactor (BCR), air-lift reactor (ALR) and aerated stirred reactor (ASR). The ASR demonstrated the highest capacity of gas holdup and resistance, and homogeneity in flow regimes and shearing forces, resulting in producing large numbers of small and compact flocs. The fluid dynamics in the ALR created regularly directed recirculation forces to enhance the gas holdup and sludge flocculation. The BCR distributed a high turbulent flow regime and non-homogeneity in gas holdup and mixing, and generated large numbers of larger and looser flocs. The sludge size distributions, compressibility and settleability were significantly influenced by the reactor configurations associated with the flow regimes and hydrodynamics.