拜耳法赤泥钙盐氯化还原焙烧—弱磁选提铁  被引量:2

Iron extraction from Bayer red mud using chloridizing reduction roasting—low intensity magnetic separation with calcium salts

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作  者:肖军辉[1,2,3] 邹凯 钟楠岚 高德强 李成秀 XIAO Junhui;ZOU Kai;ZHONG Nanlan;GAO Deqiang;LI Chengxiu(Sichuan Provincial Engineering Lab of Nonmetallic Mineral Powder Modification and High-Value Utilization,Southwest University of Science and Technology,Mianyang,Sichuan 621010,China;Dongfang Boiler Group Co.,Ltd.,Zigong,Sichuan 643001,China;Key Laboratory of Ministry of Education for Solid Waste Treatment and Resource Recycle,Southwest University of Science and Technology,Mianyang,Sichuan 621010,China;Applied Technology Innovation Center of Rare Earth Resources,China Geological Survey,Institute of Multipurpose Utilization of Mineral Resources,Chinese Academy of Geological Sciences,Chengdu,Sichuan 610041,China)

机构地区:[1]西南科技大学四川省非金属矿粉体改性与高质化利用工程实验室,四川绵阳621010 [2]东方电气集团东方锅炉股份有限公司,四川自贡643001 [3]西南科技大学固体废物处理与资源化利用教育部重点实验室,四川绵阳621010 [4]中国地质科学院矿产综合利用研究所中国地质调查局稀土资源应用技术创新中心,四川成都610041

出  处:《中国矿业大学学报》2023年第3期585-595,共11页Journal of China University of Mining & Technology

基  金:四川省科技计划资助项目(2022YFS0462,2021YJ0057,2021YFG0268)。

摘  要:云南文山某地拜耳法赤泥中全铁(TFe)的质量分数为26.86%,主要含铁矿物为Fe_(2)O_(3)和FeSiO3,铁是影响Sc,Ti,Ga等有价组分提取的关键金属.基于此,本研究提出钙盐氯化还原焙烧—弱磁选深度提铁工艺,将拜耳法赤泥与焦炭、氯化钙、次氯酸钙按一定比例混匀后置入焙烧炉中进行氯化还原焙烧,强化铁从弱磁性铁矿物转变为强磁性铁矿物,焙烧矿冷却后经湿式磨矿至一定细度的物料,采用弱磁选回收铁,获得铁精矿.研究结果表明:添加CaCl_(2)和Ca(ClO)2可促进FeO转变为FeCl_(3)后,在焦炭表面被还原成Fe0,方解石分解产生的CaO可促进FeSiO3被还原成Fe0,显著提高焙烧矿中金属铁的质量分数,有利于焙烧矿弱磁选回收铁.在m(赤泥)∶m(焦炭)∶m(氯化钙)∶m(次氯酸钙)=100∶16∶15∶8、焙烧温度为1373 K、焙烧时间为80 min、弱磁选磁场强度为0.18 T、弱磁选磨矿细度小于0.045 mm占比90%的综合工艺条件下,TFe质量分数为81.91%、Fe回收率为91.14%的铁精矿中的主要矿物为Fe0和Fe3O4,分别占全铁的79.62%,17.84%.The Bayer red with TFe content 26.86%in Wenshan of Yunnan province,and the main Fe-bearing minerals are Fe_(2)O_(3)and FeSiO3.Iron is the key metal affecting the extraction of valuable components such as Sc,Ti and Ga.Based on this,aprocess of chloridizing reduction roasting—low intensity magnetic separation with calcium salts was proposed to deep extract iron from the Bayer red mud.Red mud,coke,calcium chloride,and calcium hypochlorite chloride with a certain proportion were placed in roasting furnace after blending with reduction roasting,which strengthening the iron from weak magnetic iron minerals to strong magnetic iron minerals.Roasted ore was grinded by wet grinding materials to a certain fineness after cooling,then iron was recovered using low intensity magnetic separation recovery of iron,and iron concentrate was obtained.The results show that CaCl_(2)and Ca(ClO)2can promote FeO to be reduced to Fe0on coke surface after FeCl_(3)produced,and CaO produced by calcite decomposition can promote FeSiO3to be reduced to Fe0,which significantly increases the content of metal iron in the roasted ore.It is beneficial to recover iron by low intensity magnetic separation from the roasted ore.An iron concentrate with TFe content of 81.91%,and Fe recovery of 91.14%is obtained,and the main minerals in the iron concentrate are Fe0and Fe3O4,which accounted for 79.62%and 17.84%of the total iron,respectively under the comprehensive process conditions:the mass proportion of m(red mud):m(coke):m(calcium chloride):m(calcium hypochlorite)=100∶8∶16∶15,roasting temperature of 1373K,roasting time of 80 min,the low intensity magnetic field of 0.18 Tand 90%of grinding fineness less than 0.045mm.

关 键 词:拜耳法赤泥 提铁 焙烧 磁选 钙盐 

分 类 号:TD951[矿业工程—选矿] TF11[冶金工程—冶金物理化学]

 

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