Study on surface magnetization recover ilmenite from titanaugite using surfactant sodium oleate

ABSTRACT

Separation of ilmenite from titanaugite was investigated by magnetic coating. By enlarging magnetic difference between ilmenite and titanaugite, ilmenite was efficiently recovered. Scanning electron microscope and vibrating sample magnetometer results indicated that magnetite selectively coated onto ilmenite surface and increased its magnetism, which resulted in different magnetic separation behavior between ilmenite and titanaugite. FTIR and contact angle measurements confirmed that the adsorption difference of sodium oleate resulted in a stronger hydrophobicity on magnetite and ilmenite than titanaugite. Interaction energy analysis illustrated that hydrophobic association interaction on ilmenite was stronger than that on titanaugite, and which led to the selective coating of magnetite onto ilmenite.     

某钒钛磁铁矿尾矿资源化利用

承德市某钒钛磁铁矿尾矿钛含量较高,潜在回收价值可观。采用化学分析、XRD衍射分析、粒度分析、矿物解离分析仪(MLA)等手段研究了该尾矿的矿物学特性及钛的赋存状态。在工艺矿物学研究基础上,通过试验研究确立了重选短流程回收钛、选钛尾矿差异化分级利用的综合利用技术工艺,获得含TiO234.60%、回收率53.43%的钛铁矿精矿以及产率66.22%的建筑用商品砂,实现了铁尾矿的资源化综合回收利用,有助于矿山与社会环境和谐发展。     

云南富宁良子老寨钛铁矿成矿规律和矿床成因

云南富宁地区钛铁矿是我国重要的钛铁矿矿床,成矿条件优越。本文对良子老寨矿区残坡积风化壳型钛铁砂矿床的地质特征、矿体、矿石特征进行了总结和研究,探讨了矿床的矿床成因和成矿规律。海西—印支期偏碱性基性钛辉辉长辉绿岩体为该区钛铁矿的形成提供了物质来源。富宁地区温热潮湿多雨气候有利于风化作用形成,岩体出露地表后,岩体中的钛矿物经风化剥离、水解作用、次生富集、原地残留或近距离搬运沉积,形成了残坡积风化壳型钛铁砂矿床。陡坡、临近河流区域矿体厚度薄,风化作用弱部位品位低;山脊缓坡、河谷阶地、地形低凹地段矿体厚度较大、品位高。本文研究成果能够指导滇东南地区残坡积物风化壳内钛矿的找矿工作。     

某钒钛磁铁矿尾矿中钛铁矿的选矿研究

某钒钛磁铁矿尾矿品位较低,TiO2品位为3.2%,试样中钛铁矿的含量为5%。试样中TiO2在细级别中分布较多。试样经磁选预选可有效的抛除大量尾矿,钛粗精矿经分级后的重选效果较好,然后采用高压电选工艺,可获得品位大于38%的钛精矿。"磁选-重选-电选"综合条件试验可获得TiO2品位为39.28%,回收率13.87%的钛精矿。     

硫酸法钛白酸解尾渣工艺矿物学特性分析

采用激光粒度仪、XRD、XRF、ICP-AES、SEM-EDS、比重法、筛分法等对硫酸法钛白生产过程中酸解尾渣进行系统的工艺矿物学特性分析,旨在为回收钛资源提供理论指导。研究表明,酸解尾渣表面潮湿,液相约占45%,其中易水解的可溶钛为4.06%(以Ti O2质量分数计);固相中不溶Ti O2干基含量为17.14%,固相颗粒粒径主要分布于1~100μm,密度为3.21 g·cm-3,颗粒大小、形状不一,有块状、锥状及团聚絮状。通过筛分实验得知钛矿与其他杂质颗粒的粒径、密度有明显差异,少量120μm以上颗粒含有石膏,密度约3.41 g·cm-3;18~75μm主要为钛铁矿,密度大于3.54 g·cm-3,钛品位可达26%;18μm以下颗粒主要为硅泥,密度约2.90 g·cm-3,易团聚,与水形成黏稠物,难分离。     

低镁钒钛磁铁矿的还原机理

为开发利用辽宁朝阳地区低镁钒钛磁铁矿资源,本文以石墨粉为还原剂,研究还原温度、碳氧比等因素对内配碳球团还原过程的影响,并采用X射线衍射(XRD)和扫描电镜(SEM)等分析方法对还原机理进行分析.研究结果表明,低镁钒钛磁铁矿与攀西地区钒钛磁铁矿相比,易于还原.当还原温度超过1 150℃时,球团均能快速进行反应;配碳比增加有利于反应分数的提高.随着反应时间的延长,球团内部先后出现浮氏体、新生钛铁矿和FeTi2O5等过渡相,还原产生的金属铁从矿物颗粒外表面到内部依次析出,金属铁相不断增加并聚集长大,球团内部新生相界面逐渐清晰.     

Synthesis of Ti(C,O, N) from ilmenite at low temperature by a novel reducing and carbonitriding approach

The clean and effective utilization of titanium-bearing minerals has challenged the titanium industry all over the world. In order to realize the high-efficiency, clean, and high value-added comprehensive utilization of ilmenite concentrate, a novel process has been proposed in this study by reducing and carbonitriding ilmenite with the CH₄-N₂-H₂ gas mixture at low temperature. Carbonitride performance and mechanism have been investigated experimentally and theoretically. The obtained results showed that the reaction process could be divided into three stages: formation of metallic iron, reduction of titanium oxide to titanium suboxides, and formation of Ti(C, O, N). The metallic iron congregated at the first two stages, but dispersed once the Ti(C, O, N) formed. The effects of both reaction temperature and preoxidation treatment on the reaction have been studied as well. It was found that the increase of temperature was conducive to the formation of Ti(C,O), and the ilmenite could be reduced completely to Ti(C,O) at 1170°C for 8 hours. The preoxidation treatment could improve the kinetics of reduction. At 1170°C, the introduction of N₂ could apparently increase the reduction rate, with the complete reduction time decreasing from 8 hours in CH₄-H₂ gas mixture to 3 hours in CH₄-N₂-H₂ gas mixture. The proposed novel process has been assessed and it showed many potential advantages and feasibility.     

30MVA直流电弧炉冶炼钛渣配碳比研究

工业生产中,为生产出合格的钛渣必须加入适量的碳作为还原剂,将高价氧化物还原为低价氧化物。云南某公司30 MVA大型密闭直流电弧炉(DC炉)生产运行过程中,通过控制无烟煤用量与钛精矿用量之比——配碳比(ratio of anthracite to ilmenite,简称AIR),使生产在输入能量一定、钛精矿成分稳定的条件下力求获得良好的产品品质。生产通过中空石墨电极将钛精矿和无烟煤加入DC炉内,熔炼温度控制为1973～2023 K;熔炼输入功率为15 MVA;入炉钛精矿粒度为0.1～0.33 mm;入炉无烟煤粒径为5～25 mm的比例大于85%。理论上熔炼还原1 t钛精矿,将会产出526 kg渣和368 kg金属铁,O/I比率约为89.4%,理论配碳比约为7.895%。通过生产物料衡算得出,一定熔炼周期内的AIR平均值为12.228%,O/I比率平均值为81.317%。在配碳量不足的情况下,钛精矿中的FeO易于离解出氧并与碳结合,使FeO还原反应优先于TiO2等氧化物,碳最大可能的消耗在FeO的还原上;配碳量越高,则碳将用于还原难还原的氧化物(如MgO,CaO,MnO等)上,使FeO的还原受到抑制。配碳比还会影响DC电炉熔渣流动性和挂渣层。试生产熔炼周期内,通过调整AIR,实现了钛渣中TiO2品质的提高,其含量可从82%提高到89%以上。     

X射线荧光光谱法测定还原钛铁矿中11种组分

将X射线荧光光谱法（XRF应用于还原钛铁矿中TiO₂、TFe、P₂O₅、SiO₂、Al₂O₃、MnO、CaO、MgO、ZrO₂、Nb₂O₅、V₂O₅的同时快速测定。以光谱纯试剂人工合成标样，解决了还原钛铁矿没有标准样品的问题。试样经过850 ℃氧化处理20 min后，以四硼酸锂(Li₂B₄O₇作熔剂，碘化铵（NH₄I作脱模剂，样品和熔剂的质量比为1∶15，于1 150 ℃的高频熔炉中熔融16 min，所得熔片均匀、强度高、成型良好。本法用于还原钛铁矿中各组分的测定，结果同理论值相吻合，相对标准偏差（n=10均小于2.5%，能够满足还原钛铁矿各组分的测定要求，特别能大大提高磷测定的准确性。     

四川某钒钛磁铁矿选铁尾矿选钛试验研究

某钒钛磁铁矿选铁尾矿含TiO213.93%,矿石属于高钛型钒钛磁铁矿,矿石组成复杂,金属矿物主要为钛铁矿、钛磁铁矿,脉石矿物主要为辉石、斜长石和橄榄石。针对该选铁尾矿性质,采用强磁选—浮选联合工艺流程,经强磁抛尾作业后,强磁精矿作为浮选物料经一粗三精三扫作业,最终可获得TiO2品位48.87%、浮选作业回收率85.51%(对选铁尾矿回收率68.97%)的合格钛精矿,选钛技术指标较好,实现了该矿综合回收利用。