高压辊磨机边料循环工艺在球团生产中的应用

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 cm2/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。

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

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 cm2/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.