对某地低品位硫酸渣经还原焙烧-磁选所得磁铁精矿进行了球团试验研究,结果表明,该磁铁精矿添加1.5%的湖泗膨润土,在造球时间10 m in、生球水分16.8%的条件下,得到生球落下强度5.3次/0.5 m、抗压强度31.55 N/个、爆裂温度435℃的良好指标;球团在预热温度900℃、预热时间10 m in、焙烧温度1 200℃、焙烧时间15 m in的条件下固结,成品球团抗压强度可到达2 871N/个,还原度为83.38%,还原膨胀指数为17.86%,低温还原粉化指数RD I-3.156.12%。研究结果证明,使用该磁铁矿完全能生产出可供高炉使用的优质氧化球团,既扩大了钢铁企业原料来源,又综合利用了硫酸渣中的铁资源,具有重大的环保效益。
To acquire understanding of Ni enrichment from laterite ore,the mineralogy and crystal chemistry of a low grade limonite type nickel laterite ore sample assaying 0.97% Ni from Indonesia were studied using optical microscopy,X-ray diffraction（XRD）,scanning electron microscopy（SEM） and electron probe microanalysis（EPMA）.According to EPMA results,the mineral includes 80% goethite（（Fe,Ni,Al）O（OH）） with 0.87% Ni,15% silicate minerals with lizardite（（Mg,Fe,Ni）3Si2O5（OH）） and olivine（（Mg,Fe,Ni）2SiO4）,and 1.19% Ni,and other minor phases,such as hematite,maghemite,chromite and quartz,and no Ni was detected.The mineralogy of the laterite ore indicates that due to the complicated association of the various phases and the variable distribution of Ni,this refractory laterite ore can not be upgraded by traditional physical beneficiation processes.
