Influence of the Iron Ore Pellets Macrostructure on Their Strength

Q4 Materials Science Steel in Translation Pub Date : 2024-02-29 DOI:10.3103/s0967091223110062

I. S. Bersenev, S. I. Pokolenko, E. R. Sabirov, N. A. Spirin, A. V. Borisenko, A. R. Kurochkin

{"title":"Influence of the Iron Ore Pellets Macrostructure on Their Strength","authors":"I. S. Bersenev, S. I. Pokolenko, E. R. Sabirov, N. A. Spirin, A. V. Borisenko, A. R. Kurochkin","doi":"10.3103/s0967091223110062","DOIUrl":null,"url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The quality of iron ore pellets significantly affects the efficiency of pig iron and HBI production. The purpose of the work is to assess the potential for increasing the strength of iron ore pellets based on their macrostructure control. As a result of the study, it is found that the compressive strength of the pellets decreases monotonically at 20 daN/pel for each percentage of porosity. The external manifestations of structural defects (small crack, large crack, pellet fragments, pellet adhesions) are studied. It is revealed that the bulk of industrial pellets have optically detectable structural defects. At the same time, there is a lower content of fractured pellets and a higher proportion of aggregations in samples from a rich in iron concentrate. The crack orientation also depends on the degree of concentrate enrichment: in pellets with a higher iron content, the cracks are predominantly concentric, and with a decrease in the mass fraction of iron in the pellets, radial cracks predominate. Controlling the macrostructure parameters and the pellet strength is possible by forming a given porosity by adding fluxes and using polymer binders, minimizing the number and height of raw pellet overloads, obtaining dense row pellets with minimal porosity, organization of heat treatment of pellets with limited conditions for the defect formation—drying and firing rate, uniform thermal field across the width and height of the layer; cooling rate.</p>","PeriodicalId":21903,"journal":{"name":"Steel in Translation","volume":"16 1","pages":""},"PeriodicalIF":0.0000,"publicationDate":"2024-02-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Steel in Translation","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.3103/s0967091223110062","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"Materials Science","Score":null,"Total":0}

引用次数: 0

Abstract

The quality of iron ore pellets significantly affects the efficiency of pig iron and HBI production. The purpose of the work is to assess the potential for increasing the strength of iron ore pellets based on their macrostructure control. As a result of the study, it is found that the compressive strength of the pellets decreases monotonically at 20 daN/pel for each percentage of porosity. The external manifestations of structural defects (small crack, large crack, pellet fragments, pellet adhesions) are studied. It is revealed that the bulk of industrial pellets have optically detectable structural defects. At the same time, there is a lower content of fractured pellets and a higher proportion of aggregations in samples from a rich in iron concentrate. The crack orientation also depends on the degree of concentrate enrichment: in pellets with a higher iron content, the cracks are predominantly concentric, and with a decrease in the mass fraction of iron in the pellets, radial cracks predominate. Controlling the macrostructure parameters and the pellet strength is possible by forming a given porosity by adding fluxes and using polymer binders, minimizing the number and height of raw pellet overloads, obtaining dense row pellets with minimal porosity, organization of heat treatment of pellets with limited conditions for the defect formation—drying and firing rate, uniform thermal field across the width and height of the layer; cooling rate.

Abstract Image

查看原文

微信好友朋友圈 QQ好友复制链接

本刊更多论文

铁矿石颗粒宏观结构对其强度的影响

摘要铁矿球团的质量极大地影响着生铁和氢氧化铝的生产效率。这项工作的目的是评估基于宏观结构控制提高铁矿球团强度的潜力。研究结果发现，球团的抗压强度在 20 daN/pel 时，孔隙度的百分比会单调下降。研究了结构缺陷的外部表现（小裂缝、大裂缝、颗粒碎片、颗粒粘连）。结果表明，大部分工业球团都存在可通过光学检测的结构缺陷。同时，在富含铁精矿的样品中，碎裂球团的含量较低，聚集的比例较高。裂纹的走向也取决于精矿的富集程度：在铁含量较高的球团中，裂纹主要为同心裂纹，而随着球团中铁质量分数的降低，径向裂纹则占主导地位。控制宏观结构参数和球团强度的方法有：通过添加助熔剂和使用聚合物粘合剂形成一定的孔隙率；尽量减少生球团过载的数量和高度；获得孔隙率最小的致密行球团；在有限的缺陷形成条件下组织球团的热处理--干燥和烧成速度；整个层宽度和高度上的均匀热场；冷却速度。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文去求助

来源期刊

Steel in Translation Materials Science-Materials Science (all)

CiteScore

0.60

自引率

0.00%

发文量

期刊介绍： Steel in Translation is a journal that represents a selection of translated articles from two Russian metallurgical journals: Stal’ and Izvestiya Vysshikh Uchebnykh Zavedenii. Chernaya Metallurgiya . Steel in Translation covers new developments in blast furnaces, steelmaking, rolled products, tubes, and metal manufacturing as well as unconventional methods of metallurgy and conservation of resources. Papers in materials science and relevant commercial applications make up a considerable portion of the journal’s contents. There is an emphasis on metal quality and cost effectiveness of metal production and treatment.