rhi回转窑用碱性砖.ppt

Contents 目录 Raw materials 原料 Magnesia 氧化镁 Properties 特性 Sources and Production 来源及生产 Types of magnesia 氧化镁的种类 Quality criterias 质量标准 Spinels 尖晶石矿物 Spinel types 尖晶石的种类 Flexibilizing effect 弹性效果 Wedge splitting test 楔形劈裂试验 Products and properties 火砖及其特性 Properties of MgO 氧化镁MgO的特性 high melting point of 2,800°C 熔点高达2,800°C (refractoriness depends of type and quantity of secondary oxides)(耐火度取决于氧化镁的类型以及二次氧化物数量) good resistance to basic slag and other hot-chemical attacks 对碱性炉渣以及其他热化学侵蚀具有良好的抵抗性 high thermal conductivity 导热率高 high thermal expansion 热膨胀率高 poor thermal shock resistance 抗热震能力不足 Improvement 改善措施 addition of a 2nd less expansive component “controlled inhomogeneous microstructure” 添加另一种膨胀率小的组分,(形成）“可控的不均匀微观结构” Spinel 尖晶石 Production of MgO from magnesite用菱镁矿生产氧化镁 Production of sintered magnesia from sea water烧结海水氧化镁的生产 Raw material magnesia 氧化镁原料 Quality criteria质量标准 Periclase crystal size方镁石晶体尺寸 Secondary phases of MgO氧化镁的二次相 CaO/SiO2 ratio钙硅(重量)比 Types of spinels尖晶石的种类 Chromite铬铁矿 MA spinel镁铝尖晶石 Hercynite, Galaxite – “Active Spinels”铁铝尖晶石, 锰铝尖晶石-“ 活性尖晶石” Mechanism of conventional spinels传统尖晶石的机理 Active spinel活性尖晶石 Wedge splitting test楔形劈裂试验 Force vs. displacement力对位移曲线图 Excellent fracture mechanical behaviour出色的断裂机械性能 Raw materials – combinations – brick types原料 - 组合 – 火砖类型 Typical microstructure of rotary kiln bricks回转窑耐火砖典型的微观结构 Product overview plant Dalian奥镁大连工厂产品 Brick properties overview耐火砖特性概况 Brick properties overview耐火砖特性概况 Lining proposal衬砌建议- 奥镁大连工厂碱性砖 28 Presentation Title Basic bricks for rotary kilns回转窑用碱性砖 Cement 水泥 ICTM. ? R. Krischanitz ? March 08 Magnesia 氧化镁 mining of magnesite 开采菱镁矿 Crushing 破碎 / sorting 选矿 Calcining煅烧 + sintering烧结 rotary kiln回转窑 or shaft kiln立窑 MgCO3 MgO + CO2 magnetic separation 磁选 sintered magnesia 烧结氧化镁 1600 – 1900°C MgCl2 + Ca(OH)2 Mg(OH)2 + CaCl2 Mg(OH)2 MgO + H2O (Kauster) D~2 g/cm3 Sintering 烧结 (1700 – 2000°C) D ~3,4 g/cm3 or fusing 电熔(2800