高结晶水锰矿粉制备高性能球团研究

来源期刊：钢铁2009年第5期

论文作者：朱德庆 徐栋梁 潘建 陈栋 张文山

文章页码：11 - 15

关键词：锰矿粉； 高结晶水； 高压辊磨； 氧化球团

Key words：manganese ore fines； high combined water； high press roll grinding； fired pellet

摘    要：以进口高结晶水含量的锰矿粉为原料,经过开路二次高压辊磨预处理,模拟链篦机-回转窑工艺制备高强度高品位氧化球团。结果表明,对于品位为w(Mn)=43.09%、铁的质量分数为6.49%、烧损14.64%及0.5～8mm占77.81%的锰矿粉,经过高压辊磨预处理,<0.045 mm占59.18%,比表面积高达2653 cm²/g,在添加2.0%的膨润土、造球时间7 min、生球水分(16±0.5)%的条件下,取得了生球落下强度23.1次/0.5 m、抗压强度10.20N/个的良好指标;球团在预热温度1050℃、预热时间10 min、焙烧温度1340℃、焙烧时间15 min的条件下在管炉内焙烧固结,成品球团矿抗压强度可达到2711 N/个。成品球团矿中w(Mn)=49.11%,S、P等有害元素含量较低,是优质的高炉或电炉原料。

Abstract: Strong fired pellets were produced by simulating grate-kiln process to supply high-quality charges from some imported manganese ore fines containing high combined water,which was preliminarily pretreated by high press roll grinding.Manganese ore fines assaying 43.09% Mn,6.49% Fe,and 14.64% LOI,and with 77.81% ranging between 0.5 mm and 8 mm site,are pretreated up to the specific surface areas of 2 653 cm²/g and 59.18% passing 0.045 mm by passing the fines through press roller twice in open circuit.The finely ground manganese fines then were mixed with 2.0% bentonite,balled at 16% moisture for 7 min in disc pelletizer,the drop number and compressive strength of green balls reach 23.1 times/0.5 m and 10.20 N per pellet,respectively.After drying in oven,green balls were preheated at 1 050 ℃ for 10 minutes and fired at 1 340 ℃ for 15 minutes in electric tube furnace,the compressive strength of fired pellets reaches 2 711 N per pellet.Therefore,these pellets are high quality burden for blast furnace or electric furnace due to high mechanical strength and high grade of Mn at 49.11% and low detrimental elements.