高压辊磨机边料循环工艺在球团生产中的应用  

Application of high pressure grinding roller edge recycle process in pellet production

作　　者：许宝科 胡文祥 易安南 潘建[2] XU Bao-ke;HU Wen-xiang;YI An-nan;PAN Jian(Sintering Plant,Fujian Sansteel Minguang Co.,Ltd.,Sanming 365000,Fujian,China;School of Minerals Processing and Bioengineering,Central South University,Changsha 410083,Hunan,China)

机构地区：[1]福建三钢闽光股份有限公司烧结厂,福建三明365000 [2]中南大学资源加工与生物工程学院,湖南长沙410083

出　　处：《中国冶金》2021年第8期49-53,59,共6页China Metallurgy

基　　金：广西自治区创新驱动资助项目(AAA18242003)。

摘　　要：采用边料循环工艺并结合三钢带式焙烧机生产实践,对高压辊磨机预处理铁精矿进行研究。结果表明,增加高压辊磨边料循环比例,铁精矿的比表面积得到了明显提高,成球性能显著改善。在造球水分为8%的条件下,边料循环50%的铁精矿比表面积、所制备生球以及焙烧球团矿各指标与同配比未经高压辊磨处理的铁精矿相比均有明显提高,铁精矿比表面积增加到1 650 cm^(2)/g,生球落下强度达10次/(0.5 m),返球率降至15%,成品球团矿抗压强度达到2 678 N,膨润土配比减少1.1%,满足企业生产要求的同时,实现节能降耗的目的。Using edge material circulation technology and combining with the production practice of Sansteel belt roaster, the high pressure grinding roller(HPGR)pretreatment of iron ore was studied.The results show that by increasing the high pressure roller mill edge material recycling process, the specific surface area(Blaine) of iron concentrate has been greatly increased, and its ballability has been significantly improved. The more proportion of edge material recycling, the better performance of Blaine increase and ballability. The pellet feed was pretreated by HPRG at 50% product cyclic loading in a closed flow path under the 8% moisture. Experimental results show that all indexes of green pellets, fired pellets and Blaine much higher than those of the pellets made of the same feed without the pretreating. The specific surface area of iron concentrate increase to 1 650 cm^(2)/g, the drop strength up to 10 times at 0.5 m, the return rate decrease to 15%, the compression strength of pellets was tested up to 2 678 N, and the bentonite ratio decrease by 1.1%, which not only meets the demand of strength for commercial pellets and energy saving for enterprises.

关 键 词：高压辊磨 边料循环 生球质量 带式焙烧机 焙烧性能 经济效益 

分 类 号：TF046.6[冶金工程—冶金物理化学]