基于LIBS技术结合内标法的烧结矿碱度测量研究  

Study on Alkalinity Measurement of Sinter Based on LIBS Technology Combined with Internal Standard Method

作　　者：王金梅[1] 卢健树 郑培超[1] 刘少剑 李刚 陈光辉 Wang Jinmei;Lu Jianshu;Zheng Peichao;Liu Shaojian;Li Gang;Chen Guanghui(Chongqing Municipal Key Laboratory of Photoelectric Information Sensing and Transmission Technology,College of Optoelectronic Engineering,Chongqing University of Posts and Telecommunications,Chongqing 400065,China)

机构地区：[1]重庆邮电大学光电工程学院光电信息感测与传输技术重庆重点实验室,重庆400065

出　　处：《中国激光》2023年第22期167-174,共8页Chinese Journal of Lasers

基　　金：国家自然科学基金(32171627,62105050);重庆市自然科学基金(cstc2020jcyj-msxmX0147);重庆市教委科技研究项目(KJQN202000640,KJZD-M202200602)。

摘　　要：对检测烧结矿的实验参数进行优化,使其光谱信号的相对标准偏差(RSD)维持在4%左右。再结合内标法,分别选择合适的Fe元素谱线作为Ca、Si元素的内标谱线,利用内标后的比值与碱度值进行拟合分析。相比于无内标方法,其校准模型的决定系数(R2)从0.468提升至0.951,且预测值的相对误差最高为1.14%。结果表明,在实验条件优化下,内标法对烧结矿碱度的预测精确度高。Objective Sinter is made from a variety of iron-containing raw materials and is the main raw material for blast-furnace ironmaking in China.Iron-containing raw materials account for nearly 70%of the blast-furnace ironmaking cost,sinter for more than 70%(mass fraction)of the blast-furnace ironmaking materials,and the sintering process for 6%-10%of the total energy consumption of iron and steel enterprises.Therefore,sinter production has a significant impact on blast-furnace ironmaking from the perspectives of cost,burden proportion,and energy savings.Alkalinity is an important parameter of sinter,which is closely related to the quality,output,and energy consumption of blast-furnace smelting.Conventional sinter alkalinity analysis methods have some limitations;therefore,it is necessary to find novel technical methods to measure sinter alkalinity.Laser-induced breakdown spectroscopy(LIBS)is used in many fields,especially in raw material screening and product analysis in the metallurgical industry,owing to its advantages of realtime,rapid,and in-situ detection,simultaneous multi-element analysis without complex sample pretreatment,and remote detection.LIBS is known as the future chemical analysis superstar and has attracted the attention of numerous researchers recently.Methods Ten sinter samples with different alkalinity values are obtained by spiking SiO2 and CaO standard samples.The experiment is conducted under atmospheric conditions.Continuous spectrum acquisition is performed at 120 different positions on the surface of each sinter sample.To obtain a better signal-to-background ratio(RSD),each spectrum is averaged from 10 consecutive pulsed laser ablation signals,and 12 spectra are obtained for each sample.Six sinter samples are used to establish the calibration model for alkalinity,and the remaining four are used as error analysis samples.The spectral lines of Fe,Si,and Ca with low interference and good stability are selected as reference spectral lines for the experimental parameter study.The effects of press

关 键 词：光谱学 激光诱导击穿光谱 内标法 烧结矿碱度 稳定性 

分 类 号：O433.4[机械工程—光学工程]