Stepwise recovery of magnesium from low-grade ludwigite ore based on innovative and clean technological route  

低品位硼镁铁共生矿中镁资源逐级提取富集新工艺（英文）

作　　者：Xiao-jiao FU Man-sheng CHU Li-hua GAO Zheng-gen LIU 付小佼;储满生;高立华;柳政根(东北大学冶金学院,沈阳110819)

机构地区：School of Metallurgy,Northeastern University,Shenyang 110819,China

出　　处：《Transactions of Nonferrous Metals Society of China》2018年第11期2384-2396,共13页中国有色金属学报（英文版）

基　　金：Project(20100042110004)supported by the Specialized Research Fund for the Doctoral Program of Higher Education of China;Projects(N090502004,N140206003)supported by Fundamental Research Funds for the Central University,China

摘　　要：A novel and clean technological route for the comprehensive utilization of low-grade ludwigite ore was proposed, inwhich magnesium was extracted by metallizing reduction？magnetic separation, sulfuric acid leaching and ethanol precipitationoperation. Meanwhile, iron-rich product, silicon-rich product and boron-rich product were obtained, respectively. In the process ofmetallizing reduction-magnetic separation, 94.6% of magnesium was enriched in the non-magnetic substance from the ore reducedat 1250 ℃ for 60 min with the ore size of 0.50-2.00 mm and coal size of 0.50-1.50 mm. When the non-magnetic substance wasleached at 90 ℃ for 15 min with the liquid-to-solid ratio of 7：1, 87.4% of magnesium was leached into the liquor separated fromsilicon gathering in leaching residue. The ethanol precipitation was conducted for 30 min with the ethanol-to-original liquid volumeratio of 1.5：1 at room temperature. 97.2% of magnesium was precipitated out with the initial concentration of 0.8 mol/L in the formof MgSO4·7H2O.实现低品位硼镁铁共生矿的综合利用,提出新的清洁生产工艺路线,通过金属化还原-磁选分离、硫酸浸出和浸出液加入乙醇结晶,提取其中的镁资源,可分别得到富铁产品、富硅产品和富硼产品。金属化还原-磁选环节中,在还原温度1250°C、还原时间60 min、矿粒度0.50～2.00 mm和煤粒度0.50～1.50 mm条件下,原矿中94.6%的镁可富集到非磁性产物中。非磁性产物在浸出温度90°C、浸出时间15 min和液固比7:1的条件下和硫酸反应,87.4%的镁可富集到溶液中,从而与残留在浸出渣中的硅分离。镁离子浓度为0.8 mol/L的浸出液常温下加入原始溶液体积1.5倍的乙醇静置30 min后,97.2%的镁以Mg SO4·7H2O的形式结晶析出。

关 键 词：LUDWIGITE MAGNESIUM metallizing reduction leaching precipitation RECOVERY 

分 类 号：TF822[冶金工程—有色金属冶金]