氢基竖炉用球团生产工艺优化  

OPTIMIZATION OF PELLET PRODUCTION PROCESS FOR HYDROGEN-BASED SHAFT FURNACES

作　　者：刘建华 Liu Jianhua(Hydrogen Metallurgy Company,HBIS Zhangxuan Technology,Xuanhua 075100,Hebei)

机构地区：[1]河钢集团张宣科技氢冶金公司,河北宣化075100

出　　处：《河北冶金》2024年第2期44-48,共5页Hebei Metallurgy

摘　　要：竖炉用高质量球团是当前研究热点,回转窑球团产线中链篦机-回转窑-环冷机各部温度优化控制是提高球团产质水平的重要环节。介绍了链篦机-回转窑-环冷机设备优化过程以及造球工艺优化措施。首先在生产工序中缩短了干燥段,延长了预热段,同时改善了环冷机热量流通,为更好的氧化焙烧奠定了基础;在造球流程改造中,将造球盘角度统一调整为46°,旋转刮刀的转速均调整为10 r/min,旋转刮刀与底衬的距离调整为30~40 mm,造球盘落料点较之前向盘内延伸100 mm,小皮带下料点到边板距离达到43 cm,最终成球效果得到明显提升。对比工艺改进前后生产球团,其还原性能有所提升,还原膨胀及低温还原粉化指数均有所改善,其还原性能有所提升,还原膨胀率有所降低,其中1号球团还原膨胀率由12.34%降低到了7.82%,低温还原粉化指数改善明显,LTD+6.3均提高了20%左右。同时造球工艺优化为我国氢基竖炉用优质铁精矿球团提供了帮助。High-quality pellets for shaft furnace are the current research hotspots,and the optimal control of the temperature of each part of the grate-rotary kiln-annular cooler in the rotary kiln pellet production line is an important link to improve the quality level of pellets.The optimization process of grate-rotary kiln-annular cooler equipment and the optimization measures of pelletizing process were introduced.In the transformation of the pelletizing process,the angle of the ball-making disc is uniformly adjusted to 46°,the rotation speed of the rotary scraper is adjusted to 10 r/min,the distance between the rotary scraper and the bottom lining is adjusted to 30~40 mm,the blanking point of the pelletizing disc extends 100 mm to the disc compared with the previous one,and the distance from the blanking point of the small belt to the side plate reaches 43 cm,the final pellet formation effect was significantly improved,compared with the production of pellets before and after the process improvement,the reduction performance was improved,the reduction expansion and low temperature reduction pulverization index were improved,the reduction performance was improved,and the reduction expansion rate of No.1 pellet was reduced from 12.34% to 7.82%,and the low temperature reduction pulverization index was significantly improved,and LTD+6.3 was increased by about 20%.At the same time,the optimization of the pelletizing process provides help for high-quality iron concentrate pellets for hydrogen-based shaft furnaces in China.

关 键 词：氢基竖炉 链篦机-回转窑 工艺优化 球团 还原膨胀率 低温还原粉化指数 

分 类 号：TF046.6[冶金工程—冶金物理化学]