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采用化学纯试剂配制保护渣,运用工艺矿物学方法分析测试了不同Na_2O配加量的试验粘度和对应的渣膜矿相结构。结果表明:等温条件下,保护渣粘度随Na_2O含量的增多呈现降低的趋势;Na_2O含量相同时,保护渣温度升高,熔渣粘度逐渐减小。不同Na_2O含量的保护渣所对应渣膜的矿物种类基本相同,主要为枪晶石、硅灰石和黄长石,且随Na_2O增加,渣膜结晶率不断增大,黄长石含量增多,晶体逐渐发育;枪晶石和硅灰石的结晶受到抑制,含量不断减少,晶形逐渐变小。建议浇注中碳钢、包晶钢等裂纹敏感性钢种时,适当提高Na_2O在保护渣中的比例,以协调渣膜的润滑和传热,减少铸坯质量缺陷的发生。
Chemical pure reagent was used to prepare the mold powder. The test viscosity and the corresponding slag film phase structure of the different amount of Na 2 O were analyzed by the method of technological mineralogy. The results showed that under the isothermal condition, the viscosity of the flux decreased with the increase of Na_2O content. When the content of Na_2O was the same, the temperature of the flux increased and the viscosity of the flux decreased gradually. The different types of slag with different Na_2O content have the same mineral species, mainly gunite, wollastonite and yellow feldspar. With the increase of Na_2O, the crystallization rate of slag film increases, the content of yellow feldspar increases and the crystal grows gradually. The crystallization of stone and wollastonite was suppressed, the content decreased and the crystal form became smaller. Proposed casting medium carbon steel, peritectic steel and other crack sensitive steel, the appropriate increase in the proportion of Na_2O in the mold powder to coordinate the lubrication and heat transfer of the film to reduce the occurrence of slab quality defects.