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A high-pressure grinding roll (HPGR) was adopted for dry milling of the weakly magnetic iron ore from Jingtieshan prior to magnetizing roasting. The results indicate that compared to wet milling, the dry milling process can reduce production costs and energy consumption. The extrusion pressure of the HPGR exerts a direct impact on the shape of the obtained cake and the subsequent breaking process. In contrast to single extrusion, multiple extrusions lead to a significant reduction in power consumption of the main machine. With the pressure of 4 MPa, the final powder with approximately 53% of passing size of-0.074 mm will require the main machine with power consumption of 6.74 kWh/t, and a circulating load of about 330%. It can meet the requirement of particle size for the subsequent roasting process.

, authors=Zhirong ZHANG, Yilin CHEN, Zebin GAO, authorsList=Zhirong ZHANG, Yilin CHEN, Zebin GAO, authorCompany=null, correspAuthors=null, authorNote=null, correspAuthorsNote=null, copyrightStatement=null, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=null, pdfFileSize=null, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, fund=null), CN=ArticleExt(id=1314907217069961578, articleId=1314907215891362152, tenantId=1146029695717560320, journalId=1235980550691926019, language=CN, title=弱磁性铁矿石干式制粉试验研究, columnId=1236276107125780707, journalTitle=矿冶工程杂志, columnName=选矿, runingTitle=null, highlight=null, articleAbstract=

采用高压辊磨机对镜铁山弱磁性铁矿进行磁化焙烧前干式制粉。结果表明，相对湿式制粉，采用干式制粉工艺可降低生产成本和能耗；高压辊磨挤压压力对料饼形状和后续打散有直接影响；与单次挤压相比，多次挤压的主机电耗明显降低；工作压力4 MPa，粉料-0.074 mm粒级占53%左右时，主机电耗为6.74 kWh/t，循环负荷约330%，满足后续焙烧粒度的要求。

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张志荣（1971—），男，陕西人，硕士，正高级工程师，主要从事难选铁矿工艺研究和选矿工程技术应用。E-mail: zhangzhirong@jiugang.com

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张志荣（1971—），男，陕西人，硕士，正高级工程师，主要从事难选铁矿工艺研究和选矿工程技术应用。E-mail: zhangzhirong@jiugang.com

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