AN APPROXIMATE ANALYTICAL PROCEDURE FOR TERNARY GIBBS-DUHEM EQUATION

In the light of estimation model for ternary excess properties,an approximate analyticalprocedure for ternary Gibbs-Duhem equation was proposed,and verification by previousternary systems as Cd-Bi-Pb and Zn-In-Cd was also made.     

FLOTATION BEHAVIOUR AND MECHANISM OF BASTNAESITE WITH N-HYDROXYL PHTHALICIMIDE

The flotation behaviour and mechanism of bastnaesite with N-hydroxyl phthalicimidewere investigated by ξ-potential measurement,infrared spectrum and quantum chemistrycalculation.The results show that 3 oxygen atoms from N-hydroxyl phthalicirnide chelatethe rare earth ions on the surface of bastnaesite to form double five-chain O=C-N-O-RE(Ⅲ)-O chelate which is chemically adsorbed on the surface of bastnasite,thus makingN-hydroxyl phthalicimide an effective collector for bastnaesite.     

SAM ANALYSIS OF NITRIDE IN 30CrNi STEEL

The nitride in 30CrNi steel and its composition along boundaries have been studied by meansof scanning Auger microprobe.The nitride identified metallographically is Zr(C,N)whichcontains a small amount of Ti and O.The interface width between the Zr(C,N)and the matrixis about 1.6 μm.An Fe-rich shell is.found on the surface of Zr(C,N)which appeared on thefracture surface.The thickness of shell is 0.1-0.8μm.The Fe concentration of its outmostlayer is 3-18 at.-% and decreases exponentially along the depth direction.     

PRJ-Z型喷浆机器人大臂机构节点力的计算

在对PRJ-Z型喷浆机器人大臂机构进行改进设计的过程中,为使其结构更为科学、合理,首先利用D-H法并结合牛顿力学平衡原理推导出大臂机构各关节处受力的通用表达式,然后对机构进行有限元分析,找到最危险状态,再利用通用表达式计算出该状态下各构件的节点力,为下一步对大臂机构中的关键构件进行精确受力分析和优化设计提供可靠的数据。     

液体除湿的经济性分析

介绍了液体除湿系统的原理，比较了液体除湿与冷冻除湿系统的初投资，认为液体除湿是一种经济节能的空调方式。     

80t顶底复合吹炼转炉的冶金效果

对比了包头钢铁（集团）公司炼钢厂80t顶底复合吹炼转炉和顶吹氧化转炉的冶金效果,结果表明,底吹气体对钢水的搅拌作远大于顶吹氧化。采用顶底复合吹炼工艺后,不仅钢水成分和温度更均匀,吹炼更平稳,而且钢水终点残余锰点含量提高。由于吹炼时间、氧化消耗量及炉渣中的FeO含量都有所降低,因此金属收得率提高,另外,通过适当提高炉渣碱度,该工艺还可取得较好的脱磷效果。     

结构中地震能量的集中与耗散

本文提出利用刚度的调整将输入结构中的地震能量转移集中于结构不太重要的部位进行耗散。并利用线性随机振动分析和非线性逐步积分的方法对结构的能量分布进行了详细的分析。求出了刚度最优调整值。数值模拟结果表明此方法是非常有效的。     

气动挡渣技术在包钢120t转炉的应用研究

介绍了转炉气动挡渣的原理以及该设备在包头钢铁（集团）有限责任公司120t转炉上的使用情况。应用初期,存在钢渣粘结并需要人工处理的情况,通过选用合适的喷涂材料,解决了这一问题。该技术使转炉下渣平均厚度南原来的97．3mm降低到46．9mm,不仅减少了钢水回磷,而且提高了合金的收得率,给企业带来了明显的经济效益。     

包钢无缝厂接箍线工艺技术特点和装备水平

包钢无缝钢管厂管加工作业区接箍生产线。是目前国内一条先进的石油套管、油管接箍供应线，能够车削范围为φ73．02-φ127．00mm的油管和范围为φ127．00-φ365．12mm的套管的各种API扣型和特殊扣型，目前已经建成并投入生产。文章从工艺流程、技术要点、设备特点等方面介绍了该生产线的特点，并提供了作业线主要设备的相关技术参数。     

Experimental and mathematical modeling of metal spray forming process

The metal spray forming process was examined using mathematical simulation and verified through the prototyping evaluation at Baosteel’s test and development facilities.The mathematical model comprised of four sections,including jet gas flow in the deposition chamber;single droplet behavior along its trajectory path;probability and statistical analysis of droplet mass behavior,and forecast of the shape and temperature distribution of the billet during the spray forming process.