低品位硼镁铁共生矿中镁资源逐级提取富集新工艺（英文）
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摘要
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。
A novel and clean technological route for the comprehensive utilization of low-grade ludwigite ore was proposed, in which magnesium was extracted by metallizing reduction-magnetic separation, sulfuric acid leaching and ethanol precipitation operation. Meanwhile, iron-rich product, silicon-rich product and boron-rich product were obtained, respectively. In the process of metallizing reduction-magnetic separation, 94.6% of magnesium was enriched in the non-magnetic substance from the ore reduced at 1250 °C 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 was leached at 90 °C for 15 min with the liquid-to-solid ratio of 7:1, 87.4% of magnesium was leached into the liquor separated from silicon gathering in leaching residue. The ethanol precipitation was conducted for 30 min with the ethanol-to-original liquid volume ratio 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 form of MgSO4·7 H2 O.
A novel and clean technological route for the comprehensive utilization of low-grade ludwigite ore was proposed, in which magnesium was extracted by metallizing reduction-magnetic separation, sulfuric acid leaching and ethanol precipitation operation. Meanwhile, iron-rich product, silicon-rich product and boron-rich product were obtained, respectively. In the process of metallizing reduction-magnetic separation, 94.6% of magnesium was enriched in the non-magnetic substance from the ore reduced at 1250 °C 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 was leached at 90 °C for 15 min with the liquid-to-solid ratio of 7:1, 87.4% of magnesium was leached into the liquor separated from silicon gathering in leaching residue. The ethanol precipitation was conducted for 30 min with the ethanol-to-original liquid volume ratio 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 form of MgSO4·7 H2 O.
引文
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[22]FUXiao-jiao,ZHAOJia-qi,CHENShuang-yin,LIUZheng-gen,GUOTong-lai,CHUMan-sheng.Comprehensiveutilizationof ludwigite ore based on metallizing reduction and magnetic separation[J].JournalofIronandSteelResearch,International,2015,22(8):672-680.
[23]WANG Guang, XUE Qing-guo, WANG Jing-song. Volume shrinkage ofludwigite/coalcompositepelletduringisothermaland non-isothermalreduction[J].ThermochimicaActa,2015,621:90-98.
[24]JIANG Tao, ZHANG Qiao-yi, LIU Ya-jin, XUE Xiang-xin, DUAN Pei-ning.Influenceofmicrowaveirradiationonboronconcentrate activationwithanemphasisonsurfaceproperties[J].Applied Surface Science, 2016, 385:88-98.
[25]LIJie,FANZhan-guo,LIUYan-li,LIUSu-lan,JIANGTao,XI Zheng-ping. Preparation of boric acid from low-grade ascharite and recovery of magnesium sulfate[J]. Transaction of Nonferrous Metals Society of China, 2010, 20(6):1161-1165.
[26]LI Jie, GUO Xue-dong, GUANG Ming, JIANG Tao. Preparation of boric acid and magnesium sulfate monohydrate from boron-rich slag bysulfuricacidleachingmethod[J].TheChineseJournalof Nonferrous Metals, 2014, 24(11):2943-2950.(in Chinese)
[27]ACARKAN N, BULUT G, KANGAL O, ONAL G. A new process for upgrading boron content and recovery of borax concentrate[J].Minerals Engineering, 2005, 18(7):739-741.
[28]LIANGBin-jun,LIGuang-hui,RAOMing-jun,PENGZhi-wei,ZHANGYuan-bo,JIANGTao.Waterleachingofboronform soda-ash-activatedludwigiteore[J].Hydrometallurgy,2017,167:101-106.
[29]LI Guang-hui, LIANG Bin-jun, RAO Ming-jun, ZHANG Yuan-bo,JIANGTao.Aninnovativeprocessforextractingboronand simultaneousrecoveringmetallicironfromludwigiteore[J].Minerals Engineering, 2014, 56:57-60.
[30]WANG Guang, XUE Qing-guo, WANG Jing-song. Effect of Na2CO3onreductionandmeltingseparationofludwigite/coalcomposite pellet and property of boron-rich slag[J]. Transactions of Nonferrous Metals Society of China, 2016, 26(1):282-293.
[31]HUQing-fu.Productionandutilizationofmagnesiumcompounds[M]. Beijing:Chemical Industry Press, 2004.(in Chinese)
[32]ZHENGXue-jia.Ahandbookofboroncompounds[M].Beijing:Chemical Industry Press, 2010.(in Chinese)
[2]ANJing,XUEXiang-xin.Lifecycleenvironmentalimpact assessment of borax and boric acid production in China[J]. Journal of Cleaner Production, 2014, 66:121-127.
[3]YUPei-feng,YANGXi-yun,XUHui,SHIXi-chang,CHENYa,YANGuo-chun.Separationtechniqueforboronandmagnesium from salt lake brine and preparation of high-purity magnesium oxide[J]. The Chinese Journal of Nonferrous Metals, 2013, 23(2):568-576.(in Chinese)
[4]PENGQi-ming,PALMERMR.ThepaleoproterozoicMgand Mg-FeboratedepositsofLiaoningandJilinprovinces,Northeast China[J]. Economic Geology, 2002, 97(1):93-108.
[5]PENG Qi-ming, PALMER M R. The paleoproterozoic boron deposits ineasternLiaoning,China:Ametamorphosedevapotire[J].Precambrian Research, 1995, 72(3-4):185-197.
[6]LUYuan-fa,CHENGYu-chuan,LIHua-qing,XUEChun-ji,CHENG Fu-wen. Metallogenic chronology of boron deposits in the EasternLiaoningPaleoproterozoicRiftZone[J].ActaGeologica Sinica(English edition), 2005, 79(3):414-425.
[7]ZHANGRan,XIEYing-ming,SONGJian-feng,XINGLi-xin,KONGDing-feng, LI Xue-mei, HETao. Extraction of boron from salt lake brine using 2-ethylhexanol[J]. Hydrometallurgy, 2016, 160:129-136.
[8]LI Zhi-hang, HAN Yue-xin, LI Yan-jun, GAO Peng. Mechanism of agglomeration and dispersion during flotation process of serpentine and ascharite[J]. The Chinese Journal of Nonferrous Metals, 2014,24(11):613-620.(in Chinese)
[9]ZHENG Xue-jia. Boron iron ore processing[M]. Beijing:Chemical Industry Press, 2009.(in Chinese)
[10]LIZhi-hang,HANYue-xin,LIYan-jun,GAOPeng.Effectof serpentine and sodium hexametaphosphate on ascharite flotation[J].TransactionsofNonferrousMetalsSocietyofChina,2017,27(8):1841-1848.
[11]LIUSu-lan,CUIChuan-meng,ZHANGXian-peng.Pyrometallurgical separation of boron from iron in ludwigite ore[J].ISIJ International, 1998, 38(10):1077-1079.
[12]YANGZhong-dong,LIUSu-lan,LIZhe-fu,XUEXiang-xin.Oxidation of silicon and boron in boron containing molten iron[J].Journal of Iron and Steel Research, International, 2007, 14(6):32-36.
[13]SUIZhi-tong,ZHANGPei-xin,YAMAUCHIC.Precipitation selectivity of boron compounds from slags[J]. Acta Materialia, 1999,47(4):1337-1344.
[14]JIANG Tao, XUE Xiang-xin. Synthesis of(Ca, Mg)-α'-Sialon-AlNBNpowdersfromboron-richblastfurnaceslagbymicrowave carbothermalreduction-nitridation[J].TransactionsofNonferrous Metals Society of China, 2012, 22(12):2984-2990.
[15]JIANGTao,WUJun-bin,XUEXiang-xin,DUANPei-ning,CHU Man-sheng. Carbothermal formation and microstructural evolution ofα'-Sialon-AlN-BNpowdersfromboron-richblastfurnaceslag[J].Advanced Powder Technology, 2012, 23:406-413.
[16]LIYong-li,QUJing-kui,WEIGuang-ye,QITao.Influenceof Na2CO3 as additive on direct reduction of boron-bearing magnetite concentrate[J].JournalofIronandSteelResearch,International,2016, 23(2):103-108.
[17]DINGYin-gui,WANGJing-song,WANGGuang,MASai,XUE Qing-guo.Comprehensiveutilizationofpaigeiteoreusingiron nuggetmakingprocess[J].JournalofIronandSteelResearch,International, 2012, 19(6):9-13.
[18]YU Jian-wen, HAN Yue-xin, GAO Peng, LI Yan-jun. Recovery of boron from high-boron iron concentrate using reduction roasting and magneticseparation[J].JournalofIronandSteelResearch,International, 2017, 24(2):131-137.
[19]FUXiao-jiao,YUHong-xiang,LIUZheng-gen,CHUMan-sheng.Experimentalstudyonnewprocessforselectivereductionand separationofboron-bearingironconcentrate[J].Journalof Northeastern University(Natural Science), 2013, 34(7):966-970.(in Chinese)
[20]YU Jian-wen, HAN Yue-xin, GAO Peng. Thermodynamic behavior of boron minerals in iron concentrate during direct reduction[J]. The Chinese Journal of Nonferrous Metals, 2015, 25(7):1966-1977.(in Chinese)
[21]WANGGuang,WANGJing-song,DINGYin-gui,MASai,XUE Qing-guo. New separation method of boron and iron from ludwigite based on carbon bearing pellet reduction and melting technology[J].ISIJ International, 2012, 52(1):45-51.
[22]FUXiao-jiao,ZHAOJia-qi,CHENShuang-yin,LIUZheng-gen,GUOTong-lai,CHUMan-sheng.Comprehensiveutilizationof ludwigite ore based on metallizing reduction and magnetic separation[J].JournalofIronandSteelResearch,International,2015,22(8):672-680.
[23]WANG Guang, XUE Qing-guo, WANG Jing-song. Volume shrinkage ofludwigite/coalcompositepelletduringisothermaland non-isothermalreduction[J].ThermochimicaActa,2015,621:90-98.
[24]JIANG Tao, ZHANG Qiao-yi, LIU Ya-jin, XUE Xiang-xin, DUAN Pei-ning.Influenceofmicrowaveirradiationonboronconcentrate activationwithanemphasisonsurfaceproperties[J].Applied Surface Science, 2016, 385:88-98.
[25]LIJie,FANZhan-guo,LIUYan-li,LIUSu-lan,JIANGTao,XI Zheng-ping. Preparation of boric acid from low-grade ascharite and recovery of magnesium sulfate[J]. Transaction of Nonferrous Metals Society of China, 2010, 20(6):1161-1165.
[26]LI Jie, GUO Xue-dong, GUANG Ming, JIANG Tao. Preparation of boric acid and magnesium sulfate monohydrate from boron-rich slag bysulfuricacidleachingmethod[J].TheChineseJournalof Nonferrous Metals, 2014, 24(11):2943-2950.(in Chinese)
[27]ACARKAN N, BULUT G, KANGAL O, ONAL G. A new process for upgrading boron content and recovery of borax concentrate[J].Minerals Engineering, 2005, 18(7):739-741.
[28]LIANGBin-jun,LIGuang-hui,RAOMing-jun,PENGZhi-wei,ZHANGYuan-bo,JIANGTao.Waterleachingofboronform soda-ash-activatedludwigiteore[J].Hydrometallurgy,2017,167:101-106.
[29]LI Guang-hui, LIANG Bin-jun, RAO Ming-jun, ZHANG Yuan-bo,JIANGTao.Aninnovativeprocessforextractingboronand simultaneousrecoveringmetallicironfromludwigiteore[J].Minerals Engineering, 2014, 56:57-60.
[30]WANG Guang, XUE Qing-guo, WANG Jing-song. Effect of Na2CO3onreductionandmeltingseparationofludwigite/coalcomposite pellet and property of boron-rich slag[J]. Transactions of Nonferrous Metals Society of China, 2016, 26(1):282-293.
[31]HUQing-fu.Productionandutilizationofmagnesiumcompounds[M]. Beijing:Chemical Industry Press, 2004.(in Chinese)
[32]ZHENGXue-jia.Ahandbookofboroncompounds[M].Beijing:Chemical Industry Press, 2010.(in Chinese)