白云鄂博氧化矿氢基矿相转化产品工艺矿物学特性研究及选别工艺论证

Mineralogical Characterization of Hydrogen-Based Ore Phase Transformation Product Process of Bayan Obo Oxide Ore and Demonstration of Separation Processes

为了更好地开发利用包钢宝山铁等资源,采用化学成分分析、SEM、MLA、X射线衍射分析等检测方法对白云鄂博预富集精矿氢基矿相转化产品(HMPT)进行工艺矿物学研究,并对该矿石进行了分离回收探索试验。结果表明,HMPT中产品TFe含量为41.10%,FeO含量15.60%,REO品位为5.69%,主要杂质成分为SiO_(2),含量为8.41%,赤褐铁矿在氢基矿相转化过程中基本还原为磁铁矿。HMPT产品中-0.074 mm粒级含量为52.23%,铁分布率为48.22%;-0.038 mmm粒级含量为39.10%,TFe品位为36.26%,铁分布率为35.06%。磁铁矿的总体解离度较差,为63.61%。其中主要与稀土氧化物或石英二相连生,尤其与稀土氧化物嵌布关系更为紧密,部分磁铁矿与白云石、独居石等矿物多相连生。独居石和稀土氧化物在-0.043 mm解离度较高,但总解离度均不足60%;萤石解离度较差,总解离度约为50%;铌矿物解离度最差,不足25%。不同矿物之间的单体解离度较低,嵌布关系较为复杂。因此推荐采用阶段磨矿—阶段磁选—反浮选试验流程,最终磁选精矿经过浮选脱氟后,可获得TFe品位65.26%、铁总回收率80.68%、F含量0.28%的技术指标,实现了铁的高效回收。

In order to better develop and utilize the resources of Baosteel Baoshan iron,fluorite and rare earths,the process mineralogical study of Baiyan Obo pre-enriched concentrate hydrogen-based mineral phase transformation(HMPT)product was carried out by using chemical composition analysis,SEM,MLA,X-ray diffraction analysis and other testing methods,and the separation and recovery of the ore was explored and tested.The results show that the product TFe content in HMPT is 41.10%,FeO content is 15.60%,REO grade is 5.69%,the main impurity component is SiO_(2)with 8.41%,and hematite is basically reduced to magnetite in the process of hydrogen-based mineral phase transformation.The content of-0.074 mm grain size in the HMPT product is 52.23%,and the iron distribution ratio is 48.22%.The content of-0.038 mmm grain size is 39.10%,the TFe grade is 36.26%,and the iron distribution rate is 35.06%.The overall dissociation of magnetite is poor,63.61%.Which is mainly associated with rare earth oxides or quartz diamictite,especially with rare earth oxides embedded more closely,part of the magnetite and dolomite,monazite and other minerals are mostly associated.Monazite and rare earth oxides in the-0.043 mm dissociation degree is high,but the total dissociation degree is less than 60%.Fluorite dissociation degree is poor,the total dissociation degree is about 50%.Niobium minerals dissociation degree is the worst,less than 25%.The dissociation degree between different minerals is low,and the embedding relationship is more complicated.Therefore,it is recommended to adopt the experimental process of stage milling-stage magnetic separation-reverse flotation,and after the final magnetic separation concentrate is defluorinated by flotation,it can obtain the technical indexes of 65.26%TFe grade,80.68%total iron recovery and 0.28%F content,which realizes the high-efficiency recovery of iron.