摘要：连铸保护渣是以 CaO-SiO2-Al2O3为基料，Na2O、CaF2等为熔剂，碳质组分作为骨架材料的一种硅酸盐材料。主要成分为CaO，SiO2，Al2O3，Na2O (或Li2O)，CaF2及碳颗粒。保护渣的作用主要有防止钢液的二次氧化、绝热保温、吸收夹杂、润滑、均匀传热等。目前大多数保护渣采用预熔渣，而保护渣市场竞争相当激烈，为降低成本，本次研制型号7030和7030改两种混合型保护渣，并与预熔型保护渣进行了比较。实验结果表明：混合型保护渣具有制作工艺简单，能够减少预熔和喷雾造粒等高能耗工艺过程，有效的节约了资源，降低成本，提高了保护渣生产的经济效益。混合型保护渣与预熔渣相比，化学成分相当，炉渣碱度、熔点、粘度接近，所得的混合型保护渣的碱度分别为0.41、0.42，粘度为1.61、1.69(1400℃.Pa.s)，熔点为1160、1155℃，使用性能可以和预熔型保护渣相媲美。7367
关键词：保护渣；连铸；性能
Research on the mixed-flux mould powder
Abstract：Composition of mould powder is as following:CaO-SiO2-Al2O3 as the base material, Na2O, CaF2 as the flux, carbonaceous material component as a framework silicate material. Main components are CaO, SiO2, Al2O3, Na2O (or Li2O), CaF2, and carbon particles. The main function of mould powder is to prevent secondary oxidation of liquid steel, insulation, absorbing inclusions, lubrication and uniform heat transfer and so on. Now Most mould powder using premelting slag, slag and protection market is highly competitive, in order to reduce costs, To development mould 7030 and 7030 changed two kinds of mixed flux, and with the pre-melting type mould powder were compared. The experimental results showed that: mixed flux with simple fabrication process, to reduce pre-melting and high energy consumption spray granulation process, effectively save resources, reduce costs and improve the protection of slag produced economic benefits. Mixed flux as compared with the pre-slag chemical composition quite, slag basicity, melting point, viscosity, close, and the resulting hybrid protective slag basicity were 0.41,0.42, a viscosity of 1.61,1.69 (1400 ℃. Pa.s), melting point 1160,1155 ℃, the use of performance can be pre-melting slag type of protection comparable to the performance.
KeyWords：mould powder；continuous casting；viscosity
目 录
1前言    1
1.1 连铸保护渣概述    1
1.1.1 连铸保护渣技术发展概况    1
1.1.2 结晶器保护渣在连铸生产中的基本功能    1
1.2 连铸结晶器保护渣的品种及特点    2
1.3 连铸保护渣的工作机理    2
1.4 结晶器保护渣的主要理化性能    3
1.4.1 熔化温度    3
1.4.2 熔化速度    4
1.4.3 粘度    4
1.4.4结晶性能    4
1.4.5 表面张力    4
1.4.6 传热性能    5
1.4.7 粒度    5
1.5 连铸工艺参数对保护渣性能的要求    5
1.5.1钢种对保护渣性能的要求    5
1.5.2 振动对保护渣的要求    5
1.5.3 拉速对保护渣的要求    6
1.5.4 结晶器断面形状和尺寸对保护渣的要求    6
1.6 保护渣的设计原理    6
1.6.1保护渣化学成分的确定    6
1.6.2保护渣物理性能的确定    10
2 实验    14
2.1实验用原材料    14
2.2实验设备    14
2.3试验方案    15
2.3.1混合型保护渣和预熔型保护渣生产工艺的比较    15
2.3.2混合型保护渣和预熔型保护渣成本比较    15 混合型保护渣的研究+文献综述:http://www.751com.cn/cailiao/lunwen_5294.html