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通过细磨海砂矿研究其粒级分布、微观结构和烧结高温特性的变化,结合烧结杯试验、扫描电镜能谱分析等研究方法考察海砂矿粒级分布对烧结矿质量的作用机理.经细磨后海砂矿颗粒不规则程度增大,制粒性能得到改善.随着海砂矿粒度变细,其烧结高温特性呈现出与普通铁矿粉相反规律,其中海砂矿3(细磨25 min的海砂矿)与海砂矿1(未经细磨的海砂矿)相比,同化温度升高21℃,1280℃时液相流动性指数减小0.35,细磨后海砂矿与Ca O反应生成钙钛矿增多,阻碍同化反应进行,生成的液相黏度增大.配加8%海砂矿3的烧结矿与配加相同比例海砂矿1相比,还原性提高3.8%,细磨后海砂矿在混合料中分布更加均匀,造成烧结矿中含钛物相质点增多,还原中产生众多微细裂纹,利于还原气体扩散.
The effect of particle size distribution of sea sand on the quality of sinter was studied by studying the changes of the grain size distribution, microstructure and high temperature characteristics of sinter by finely grinding sea sand, and combining with sintering cup test and scanning electron microscopy (EDS) analysis. After the fine grinding, the degree of irregularity of the sea sand grains increases, and the granulation performance is improved.With the fineness of the sea sand grains, the high temperature sintering characteristics of the sea sand exhibits the opposite rule from the ordinary iron ore powder, and the sea sand 3 min), the assimilation temperature increased by 21 ℃ and the liquidity index decreased by 0.35 at 1280 ℃, compared with sea sand mine 1 (without finely ground sea sand mine) O reaction generated more perovskite, obstruct the assimilation reaction, the liquid phase viscosity increases with the addition of 8% of the sea ore 3 with the same proportion of the proportion of sea sand 1, reduction of 3.8% After fine grinding, the sea sand ore distributes more evenly in the mixture, resulting in the increase of the particle size of the titanium-containing phase in the sinter and the generation of numerous fine cracks in the reduction, which is favorable for the diffusion of the reducing gas.