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大西沟难选菱铁矿石综合利用新工艺

大西沟难选菱铁矿石综合利用新工艺

New Process of Comprehensive Utilization for Daxigou Refractory Siderite Ore

New Process of Comprehensive Utilization for Daxigou Refractory Siderite Ore

doi:
10.12068/j.issn.1005-3026.2018.02.020
摘要:
采用强磁预选—磁化焙烧—磁选联合工艺对大西沟难选菱铁矿石进行试验研究.结果表明:在磨矿细度-74 μm占55%、强磁粗选磁场强度318 kA/m、强磁扫选磁场强度717 kA/m的条件下,可得到TFe品位为28.47%、回收率为96.78% 的强磁精矿;强磁精矿在中性气氛中于焙烧温度700℃、焙烧时间40 min、磨矿细度-43 μm 占95%、弱磁选磁场强度104 kA/m 的综合条件下,获得 TFe 品位为59.29%、回收率87.50% 的精矿产品.XRD、光学显微镜和VSM等分析结果表明:难选菱铁矿和褐铁矿经焙烧后转变为易选磁铁矿,新生成的磁铁矿表面疏松多孔,多呈胶状,与脉石矿物紧密共生,其磁化强度和比磁化系数均显著提高.
Abstract:
Daxigou refractory siderite ore was investigated through high intensity magnetic preconcentration- magnetization roasting - magnetic separation. The results showed that high intensity magnetic concentrate with iron grade of 28.47% and recovery of 96.78% was obtained under the test conditions that the grinding fineness of 55% ores is less than 74 μm,high intensity magnetic field for roughing is 318 kA/m and magnetic field for scavenging is 717 kA/m. Iron concentrate with iron grade of 59.29% and recovery of 87.50% was obtained under roasting temperature of 700℃, roasting time of 40 min with neutral atmosphere,95% grinding fineness less than 43 μm and low intensity magnetic field intensity of 104 kA/m. The analysis results of XRD,optical microscope and VSM showed that refractory siderite and limonite are transformed into easily separated magnetite by roasted, meanwhile, the surface of the newly generated magnetite showed loose and porous, symbiosis between magnetite and gangue minerals is close, and the magnetization intensity and specific susceptibility increase greatly.
作者 张小龙 韩跃新 李艳军 唐志东
Author: ZHANG Xiao-long HAN Yue-xin LI Yan-jun TANG Zhi-dong
作者单位 东北大学 资源与土木工程学院,辽宁 沈阳,110819
期 刊: 东北大学学报(自然科学版) ISTIC EI SCI PKU CSSCI
Journal: Journal of Northeastern University(Natural Science)
年,卷(期) 2018, 39(2)
分类号 TD912
关键词: 菱铁矿 知识脉络 强磁预选 知识脉络 磁化焙烧 知识脉络 磁铁矿 知识脉络 比磁化系数 知识脉络
Keywords: siderite ore high intensity magnetic preconcentration magnetization roasting magnetite specific susceptibility
机标分类号
基金项目 国家自然科学基金资助项目,中央高校基本科研业务费专项资金资助项目
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