盾构泥除铁技术研究

提高废弃渣土和低品位原料在陶瓷生产的使用率是解决陶瓷原料短缺的重要途径。盾构施工产生的大量盾构渣土,但其较高的铁含量影响陶瓷制品的白度,故盾构泥不能直接用于陶瓷生产。本论文针对盾构泥铁含量过高的问题进行了详细的除铁技术研究。采用物理磁选除铁技术,盾构泥中的铁含量降低了26.64%,陶瓷的白度达到21.08%;利用0.5 mol/L草酸浸泡4 h的化学反应除铁技术,盾构泥中的铁含量降低了77.37%,陶瓷的白度达到31.43%。本研究为盾构泥及低品位原料的除铁技术提供了一些新思路。     

高岭土生产硫酸铝及沉淀法除铁的研究

对工业品硫酸铝的制备及沉淀法除铁的工艺进行了研究。实验结果表明，硫酸原料的质量分数可提高至６３％，用高锰酸钾作为除铁剂可除去产品中４５％～５０％的铁。     

二次铝灰制备低铁硫酸铝工艺研究

本文以固体二次铝灰为主要原料,通过预处理、酸浸、除铁、浓缩蒸发得到低铁硫酸铝,浸出过程重点考察了浸出时间、温度、酸浓度、配料比等实验条件对铝的浸出率的影响,浸出后采用亚铁氰化钾沉淀法除铁,主要考察了配料比对除铁效果的影响。当硫酸浓度25%~30%(质量分数),反应温度100℃,浸出时间6 h,铝灰的铝提取率可达到76%。除铁配料比达到1.4时,除铁效果达到98%,Fe含量仅为0.005%,可得到低铁硫酸铝产品。     

铁铝尖晶石的合成及应用研究进展

较系统地介绍了铁铝尖晶石的合成机制,并对铁铝尖晶石的合成方法特点进行了对比,同时还对比了以铁铝尖晶石为原料制备的氧化镁-铁铝尖晶石砖与其他水泥回转窑烧成带常用砖的基本性能与特点,指出铁铝尖晶石是一种非常有使用前景的水泥回转窑衬砖用耐火原料。     

硫酸铝采用低碳脂肪酸萃取除铁试验

硫酸铝的铁含量是一项重要的质量指标。其含量高低对造纸的影响很大。目前国内在硫酸铝的生产中多以原料钒中的铁含量来调节。为摆脱硫酸铝产品质量为钒土质量所左右的局面,能以低品位原料生产优质产品,以满足造纸、印染等工业的要求,数年前开始进行了硫酸铝除铁工艺的试验研究。曾选用过冷冻结晶法等除铁方法,但均不适应工业化大生产的要求。近年来在贵阳铝镁设计院脂肪酸除铁的小试基础上进行了中试,取得了一定成果,情况如下:     

锆英石脱硅精化技术

以锆英石精矿为原料，加脱硅复合不原剂，外加剂等，经电弧炉一次熔融脱硅并除铁，钛，将熔炼了的富锆液喷式成球。对脱硅反应过程了研究，并对工艺参数的选择进行了优化试验。生产的电熔脱硅锆解决了我国这种原料长期信赖进口的局面，大大改善了玻璃窑用熔铸造耐火制品的产品性能。     

活性二氧化锰除铁在无铁硫酸铝生产中的应用

杂质铁是影响硫酸铝产品质量的主要元素,随着优质铝土矿资源的紧张和品位的下降,如何低成本、高效地除铁对生产合格的硫酸铝产品和充分利用低品位铝土矿有着重要意义.利用活性二氧化锰除铁技术,以硫酸分解铝土矿法生产的硫酸铝为原料,经过调碱、除铁、分离过程生产出无铁硫酸铝产品,并建成了一条年产5 000 t的生产线.总结出当硫酸铝的碱度控制在碱式硫酸铝质量浓度3.0 g/L(以Al2O3计)、二氧化锰与铁的物质的量比为(2:1)～(4:1)、反应温度在90℃左右、吸附共沉时间控制在30 min左右时有最佳的除铁效果.实践表明:用活性二氧化锰除铁生产无铁硫酸铝的方法是切实可行的,所得产品质量完全符合HG/T 2225-2000<工业硫酸铝标准>固体Ⅱ型合格品和一级品要求.这种生产方法简单,易控制,成本低,有较好的经济效益.     

纯碱生产中的硫化物除铁工艺技术探讨

本文介绍了两种通过加硫工艺设计,降低纯碱生产中母液铁含量的工艺技术。详细比较了以硫化钠为原料和以硫化氢为原料的加硫工艺过程及原理,分别阐述了两种工艺的优缺点,分析了纯碱母液除铁的工艺设计中应注意的问题。     

不含致癌物的再生矿物所生产的高炉铁沟料

取得了完全由再生矿物制造的、供给高炉铁水沟及其它热工窑炉内衬用生态纯净的耐火浇注料的配料配方，其性能指标不亚于由天然原料(或者以天然原料为基础人工合成的原料)制造的传统粉料的同类指标，而且其生产成本较低。     

卤水-石灰法制氢氧化镁除铁工艺研究

以卤水为原料,以石灰乳为沉淀剂制备氢氧化镁.系统考察了反应温度、络合剂用量、还原剂用量、反应时间等工艺条件对氢氧化镁除铁过程的影响,通过正交试验,得到优化除铁工艺条件,即反应温度为40 ℃,络合剂用量为0.15 g,还原剂用量为0.10 g,反应时间为10 min,在此条件下,所得氢氧化镁产品铁的质量分数小于5×10-4.该工艺用于碳酸钙、轻质碳酸镁、高岭土等无机粉体材料的除铁均取得较好的效果.     

磁化复混肥料的磁化工艺及磁性稳定性研究

实验室条件下以粉煤灰、钢渣粉、选铁尾矿粉为磁性材料,研究了磁性材料的磁化性能、生产磁化复混肥的磁化工艺及肥料磁性的稳定性,并测定了磁化复混肥料的重金属含量。结果表明,磁化工艺以先造粒后磁化为佳;以选铁尾矿粉为磁性材料,在磁化场强为8 000 mT下磁化10 s生产的磁化复混肥料磁化效果最佳,且放置时间对肥料的磁感应强度影响弱;以三种磁性材料制成的磁化复混肥料的重金属含量均低于国家标准,使用安全。     

Tumour Cell Labelling by Magnetic Nanoparticles with Determination of Intracellular Iron Content and Spatial Distribution of the Intracellular Iron

Magnetically labelled cells are used for in vivo cell tracking by MRI, used for the clinical translation of cell-base therapies. Studies involving magnetic labelled cells may include separation of labelled cells, targeted delivery and controlled release of drugs, contrast enhanced MRI and magnetic hyperthermia for the in situ ablation of tumours. Dextran-coated super-paramagnetic iron oxide (SPIO) ferumoxides are used clinically as an MR contrast agents primarily for hepatic imaging. The material is also widely used for in vitro cell labelling, as are other SPIO-based particles. Our results on the uptake by human cancer cell lines of ferumoxides indicate that electroporation in the presence of protamine sulphate (PS) results in rapid high uptake of SPIO nanoparticles (SPIONs) by parenchymal tumour cells without significant impairment of cell viability. Quantitative determination of cellular iron uptake performed by colorimetric assay is in agreement with data from the literature. These results on intracellular iron content together with the intracellular distribution of SPIONs by magnetic force microscopy (MFM) following in vitro uptake by parenchymal tumour cells confirm the potential of this technique for clinical tumour cell detection and destruction.     

磁力旋流器磁系的磁场分析

设计了一种中心吸附铁化合物的磁力旋流器，利用试验和数值模拟的方法，对比分析了磁力旋流器磁场强度和分离性能。在试验中，简化了磁力旋流器磁系的结构，改变导磁铁片厚度、铁芯结构、磁系结构等参数，分析磁系对含铁化合物的吸附能力。利用数值模拟方法得到磁系的磁场强度，为分离能力预测提供依据。结果表明：磁场强度与导磁铁片的厚度成反比，随着导磁铁片厚度增大，磁场强度减小，磁力旋流器对铁化合物颗粒的吸附能力减弱，试验中导磁铁片的厚度为2mm时分离效果最好；铁棒铁芯磁系与铁管铁芯磁系相比具有更大的磁场强度；挤压式磁系与普通磁系相比具有更大的磁场强度。导磁铁片厚度的增大会使磁系端面漏磁量减少，铁芯侧面漏磁量增大；铁棒铁芯磁系的漏磁量相对较小，挤压式磁系的漏磁相对较小。     

Materials Characterization of Feraheme/Ferumoxytol and Preliminary Evaluation of Its Potential for Magnetic Fluid Hyperthermia

Feraheme, is a recently FDA-cleared superparamagnetic iron oxide nanoparticle (SPION)-based MRI contrast agent that is also employed in the treatment of iron deficiency anemia. Feraheme nanoparticles have a hydrodynamic diameter of 30 nm and consist of iron oxide crystallites complexed with a low molecular weight, semi-synthetic carbohydrate. These features are attractive for other potential biomedical applications such as magnetic fluid hyperthermia (MFH), since the carboxylated polymer coating affords functionalization of the particle surface and the size allows for accumulation in highly vascularized tumors via the enhanced permeability and retention effect. This work presents morphological and magnetic characterization of Feraheme by transmission electron microscopy (TEM), Energy dispersive X-ray spectroscopy (EDX), and superconducting quantum interference device (SQUID) magnetometry. Additionally, the results of an initial evaluation of the suitability of Feraheme for MFH applications are described, and the data indicate the particles possess promising properties for this application.     

Beneficiation of micro-fine magnetic minerals from reductive iron ore with ultrafine grinding-magnetic flocculation separation

Beneficiation of micro-fine magnetic minerals from reductive iron ore was investigated. Sample characteristics and main force analysis of magnetic floc were conducted. The results indicated that the iron phase in reductive iron ores was predominantly metallic iron (below 20 μm). By applying ultrafine grinding-magnetic flocculation separation (MFS) to the raw ore (29.85% Fe), a concentrate assaying 74.12% Fe with 81.45% iron recovery was obtained. The iron recovery increased by 6.68% compared with the conventional magnetic separation (CMS). The high efficiency in beneficiation may be attributed to an increase in magnetic force on the micro-fine iron minerals in the form of flocs.     

基于强磁预选的某氰化尾渣磁化焙烧-磁选工艺

以TFe品位为30.71%的河南某焙烧氰化尾渣为原料,采用湿式强磁预选?磁化焙烧?磁选联合工艺制备铁精粉. 结果表明,当强磁预选的磁场强度为1511.54 kA/m时,得到TFe品位44.96%、回收率78.27%的粗精矿;以该粗精矿为磁化焙烧原料,配10wt%焦粉,于750℃下磁化焙烧45 min,焙烧样经二段磨矿、二段弱磁选,当二段磨矿细度小于0.028 mm占63.9%时,可得TFe品位61.71%、回收率68.66%的铁精粉;产率为16.79%的弱磁选尾矿不含氰化物,转化为一般工业固体废物. 焙烧温度低于700℃时,部分赤铁矿未还原;焙烧温度超过800℃时,生成的磁铁矿转化成镁铁矿、铁橄榄石和方铁矿,磁铁矿含量降低,导致铁损失;焙烧温度为750℃时,磁铁矿含量最高.     

强磁选机介质形式对玻璃硅砂除铁的影响

采用两种不同形式的磁介质进行了玻璃砂强磁选除铁效果对比试验，结果表明磁介质形式对除铁效果影响显著。建议选择磁介质时不能只强调介质形式对分选磁场的影响，还应同时考虑对矿浆流动性的影响，这对于磁选机选型具有很好的参考意义。     

铁纤维的常用制备方法及应用

从铁纤维的形成原理和制备与控制技术的角度出发，介绍了制备铁纤维的传统方法和还原法，模板法，磁场引导法等几种常用的化学方法，并简述了铁纤维在一般工业领域以及吸波和磁记录领域中的应用。     

Investigation into recovery of iron values from red mud dumps

The waste generated during the alumina production by Bayer’s process is popularly called red mud. This red mud is a rich source of iron values. Generally, the iron content in the red mud varies between 20% and 45% depending on the bauxite source. The present investigation was carried out to recover iron values from red mud. Red mud contains ultrafine particles and is highly alkaline in nature because of which it is difficult to recover the iron values from it using conventional beneficiation techniques. In the present investigation, the iron values were successfully recovered by reduction roasting followed by magnetic separation. During the process, the hematitic and goethitic iron-phase minerals present in the red mud sample are converted into magnetite and metallic irons, which are subsequently recovered using low-intensity magnetic separator. The results showed that an iron recovery of 61.85% with an iron content of 65.93% of iron concentrate could be obtained at roasting temperature of 1150°C, roasting time of 60 min, and magnetic field intensity of 0.18 Tesla.     

逆流式铁粉末磁选机及其在镀锌线循环水处理中的应用

钢铁厂在钢带表面镀锌之前需要对钢带进行清洗,在冷轧过程中需要对钢带表面进行冷却。循环使用的清洗液和冷却液中含有大量的铁粉末。循环液中的铁粉末会导致镀锌缺陷和轧制缺陷。介绍了一种逆流式铁粉末磁选机,并将其用于去除循环液中含有的铁粉末。该设备在马钢股份公司1#镀锌生产线3 a的实际使用中,单循环除铁率高达98.7%,其性能完全满足钢铁厂对于除铁的要求。