超细粉在内循环流化床中的流态化特性

在内径120 mm的半圆柱形内循环流化床中,以平均粒径387 nm的Ti O2为原料,考察了单独通入流化气、射流气和同时通入流化气和射流气三种流化方式下超细粉的流化特性以及射流气速对超细粉聚团尺寸的影响。结果表明:同时通入流化气和射流气时,流化气能促进粉体循环,消除环隙死区;高速射流能有效破碎聚团,显著减小聚团尺寸,从而使超细粉在环隙区与导流管之间形成稳定循环,小聚团在环隙区实现平稳流态化。随着射流气速的增大,聚团尺寸减小,粒度分布变窄,在射流气速分别为60,90,120,150 m/s的条件下,聚团平均直径分别为194,158,147,135μm。     

利用氧化铁皮烧结矿做炼钢氧化剂的探讨

用氧化铁皮研制烧结放代替铁矿石做炼钢氧化剂经试验表明，其理化性能均优于铁矿石，可替代铁矿石作为炼钢的氧化剂。氧化铁皮的开发利用，综合效益显著。     

烧结矿品质预报的研究

某钢厂第二烧结车间现有90m^2、105m^2的烧结机各一台,担负着2座1000m^3高炉的供矿任务。随着高炉工艺的日益发展以及节能增效的要求,高炉对烧结矿品质的要求越来高。我国生产的烧结矿与国外生产的烧结矿有很大差距,重要原因就在于烧结矿的品质指标波动性太大,这对高炉的炉况来说是很不利的。所以,烧结矿品质预报的研究是很有必要的。     

B_2O_3对五元系固结块矿物学特征及抗压强度和还原率的影响

从五元系固结块的工艺矿物学特征入手,研究了 B_2O_3对五元系固结块矿物学特征及抗压强度和还原率的影响．     

有关烧结部件表面问题的几个案例

烧结钢部件在生产过程中，尤其是烧结之后其表面有时会出现针孔、孔洞及斑痕等缺陷。本文结合PM生产的实际过程，总结了影响部件表面问题的各种因素，并举例分析如何诊断各种不同的表面问题及其解决方案。     

Effect of moisture content on curing kinetics of agglomerate cork

The curing process of Toluene 2,4-DiIsocyanate (TDI) pre-polymer with granulate cork is significantly affected by the cork moisture content since the reaction of isocyanate is highly sensitive to water. Two types of moisture are considered: the moisture contained inside the granulate cork, residual moisture, and the moisture intentionally sprayed over the granules of cork, added moisture. This study analyses the curing kinetics of TDI and granulate cork mixtures containing added moisture using Differential Scanning Calorimetry (DSC), and the reaction rate increase associated with the added moisture content (AMC). The underlying objective of this work is to reduce the time needed to obtain agglomerate cork stoppers through AMC increase.     

空间需求聚集下安全库存模型及其实证

用定量的分析方法,对安全库存模型进行了改进.讨论了当空间需求的相关系数变动时,安全库存的成本是如何变化的.当各地区需求不是呈线形正相关的情况下,建议零售商建立中心仓库.安全库存管理不再是各自为政的独立运营过程,而是利用聚集经营去给零售企业带来更大的利润.     

石英砂超细粉碎的团聚机理与抑制方法的研究

介绍了球磨法粉碎石英砂的原理和粉体颗粒的粒度分布特征,分析了球磨过程中石英粉体颗粒团聚的机理,提出了增加分散剂和分散介质解决球磨过程的团聚问题,并定量地研究了分散剂和分散介质的交互作用关系。粉体颗粒的团聚严重影响检测精度,本文结合超声波技术,研究了石英粉体超声分散方法,确定了最佳超声分散时间。     

聚凝体聚合物膨胀特性实验研究

为了解决水驱窜流严重和采收率低的问题，对聚凝体聚合物的抗酸、抗碱、抗盐以及热稳定性进行了评价实验。实验结果表明，在酸性、碱性和高盐条件下，聚凝体聚合物的吸水膨胀速度变慢，但充分吸水膨胀后的体积膨胀倍数仍能达到10倍左右，具有较强的化学稳定性和热稳定性，吸水膨胀性好，能够适应恶劣的油藏条件。岩石流动实验表明，聚凝体聚合物驱可在聚合物驱的基础上再提高采收率12％。     

Novel MMC microstructure with tailored distribution of the reinforcing phase

Saffil short fibre agglomerates with diameters of 0.4 mm to 1 mm have been prepared using a tumbling technique. These were packed and infiltrated with molten 6061 Al alloy to make a metal matrix composite (MMC) with a novel microstructure in which the composite spheres are randomly distributed in the fibre-free aluminium matrix. In parallel, a commercial preform made of identical Saffil alumina short fibres and having the same fibre volume faction was used to prepare a conventional MMC by the same technique. Microstructural observation indicates that, within the composite spheres, the local volume fraction of fibre decreases from the outer layer to the centre region.
The energy absorption during fracture was estimated by using a three point loading test on notched samples and was compared with that for conventional MMCs. Preliminary results suggest that this novel MMC possesses higher energy absorption capability and hence better damage tolerance. The fracture surfaces were examined by scanning electron microscopy in order to inform these experimental results.