低硅矿烧结高温基础特性及优化配矿研究  

Research on high temperature basic characteristics and optimized ore blending of low silicon ore sintering blending

作　　者：杨双平[1] 孙海兴 张甜甜 刘守满 刘海金 YANG Shuangping;SUN Haixing;ZHANG Tiantian;LIU Shouman;LIU Haijin(College of Metallurgical Engineering,Xi′an University of Architecture and Technology,Xi′an 710055,Shaanxi,China)

机构地区：[1]西安建筑科技大学冶金工程学院,陕西西安710055

出　　处：《钢铁研究学报》2023年第6期659-670,共12页Journal of Iron and Steel Research

基　　金：国家自然科学基金青年科学资助项目(Z20190293)。

摘　　要：随着国内优质铁矿石的减少以及铁矿石需求的上升,低价矿石进行配矿烧结成为新的选择。为提高烧结矿质量和低硅矿高效利用,对低硅矿的高温特性进行研究从而确定合适的低硅矿配矿方案。为进一步实现烧结厂降本提产的目的,基于实验所用低硅铁矿粉高温基础特性,进行不同低硅矿配比的烧结杯实验研究,同时对低硅烧结矿的矿相结构进行观测,确定低硅矿的优化搭配规律。研究表明:当矿粉中SiO_(2)质量分数低于6%时,随着SiO_(2)含量增加,液相流动性指数升高;MgO含量增加,液相流动性指数呈现降低的趋势。低硅矿配比不超过36%(质量分数)时,增加赤铁矿的配比,可以提升液相生成量,增加针状铁酸钙的生成量。因此,通过液相流动性优化配矿能够提高低硅烧结矿质量,强化烧结过程。With the decrease of high-quality iron ore in China and the increase in demand for iron ore,low-cost ore blending and sintering had become a new choice.In order to improve the quality of sinter and the efficient utilization of low silicon ore,the high-temperature characteristics of low silicon ore were studied to determine the appropriate low silicon ore blending scheme.So as to further realize the purpose of reducing cost and increasing production of sintering plant,based on the high-temperature basic characteristics of low silicon iron ore powder used in the test,a sintering cup experiment was conducted to study the different ratios of low silicon ore.At the same time,the mineral phase structure of low silicon sintered ore was observed to determine the optimal matching law of low silicon ore.The research shows that when the SiO_(2) content in the mineral powder is less than 6 mass%,the liquid phase fluidity index increases with the increase of SiO_(2) mass fraction.As the MgO content increases,and the liquid phase fluidity index shows a downward trend.When the ratio of low silica ore is not more than 36%(mass fraction),increasing the ratio of hematite can increase the production of liquid phase and acicular calcium ferrite.Therefore,optimizing ore blending through liquid phase fluidity can improve the quality of low silicon sintered ore and strengthen the sintering process.

关 键 词：低硅矿 优化配矿 液相流动性 同化性 矿相结构 

分 类 号：TF52[冶金工程—钢铁冶金]