The Baotou Iron Ore of China contains very high niobium. This paper reported the results through laboratory and practical experiments on niobium enrichment in blast furnace. The effect of temperature, constituents of slag and silicon content in hot metal on niobium recovery was studied and the results had been verified by blast furnace operation. According to the reaserch, a comprehensive extraction process that extraction combines with ore dressing and with pyro--hydro-metallurgy should be adopted for Baotou niobium resource which is difficult to concentrating. The methods of increase in niobium recovey were also suggested in this paper

研究了轧后中温缓慢冷却与中温等温两种不同的热机械控制工艺(thermomechanical control process,TMCP)对硅锰系贝氏体钢的组织与性能的影响.通过拉伸试验机测试试验钢的力学性能,利用扫描电子显微镜、电子背散射衍射等分析手段对试验钢进行显微组织结构分析,并利用X射线衍射测定残余奥氏体含量.结果表明:随着轧后连续缓慢冷却开始温度的升高,贝氏体钢的抗拉强度、硬度及拉伸应变硬化指数n值有所提高,伸长率和冲击韧性降低,屈强比先降低后升高.随着轧后等温时间的延长,贝氏体钢的抗拉强度与屈强比先降低后升高,伸长率及冲击韧性先升高后降低.相对于等温制度,连续缓慢冷却可得到更好的综合力学性能,强塑积明显高于前者,伸长率比前者高20%以上

5.2.1基本结构 5.2.2设计计算

4.6.1可靠性设计 4.6.2优化设计 4.6.3计算机辅助设计

4.4.1概述 4.4.2压力容器的应力分类 4.4.3应力强度计算 4.4.4应力强度限制 4.4.5分析设计的应用

西安石油大学：《过程设备设计基础 Basic Theory and Design of Process Equipments》课程教学资源（电子课件）第四章 压力容器设计 4.3 常规设计 4.3.5开孔和开孔补强设计

西安石油大学：《过程设备设计基础 Basic Theory and Design of Process Equipments》课程教学资源（电子课件）第四章 压力容器设计 4.3 常规设计 4.3.3 封头设计

4.3.1概述 4.3.2 圆筒设计

西安石油大学：《过程设备设计基础 Basic Theory and Design of Process Equipments》课程教学资源（电子课件）第四章 压力容器设计 第一节 概述

3.3.1温度 3.3.2介质 3.3.3加载速率