硫铁硫烧渣制备氧化铁黄和氧化铁红

对利用硫铁矿烧渣制备氧化铁黄和氧化铁红进行了研究。考察了影响硫铁矿烧渣还原、酸溶、中和、氧化等过程的各种因素。结果表明，在适宜的条件下，利用烧渣可以制备出用做颜料的氧化铁黄和氧化铁红。     

硫铁矿渣中提取铁及其在纳米α-FeOOH制备中的应用

硫铁矿烧渣;碳酸盐法;硫铁矿渣中提取铁及其在纳米α-FeOOH制备中的应用     

落实核心素养的“铁及其化合物”复习项目式教学——硫铁矿烧渣的综合回收利用

以“硫铁矿烧渣的综合回收利用”为项目学习主题，以硫铁矿烧渣为原料制备绿矾晶体，并进行定性检测和定量组成测定为项目学习活动，呈现项目学习流程和项目实施过程。通过对真实问题的解决，培养学生的化学学科核心素养，促进深度学习。     

重铬酸钾容量法测定硫铁矿烧渣中铁的改进

硫铁矿烧渣是硫酸生产过程中的固体废弃物，其中铁含量在40％～60％。由于硫铁矿烧渣的量很大，其综合利用具有很高的实际意义，并已得到多方面的关注和研究。目前，硫铁矿烧渣除在冶炼、建材方面有所应用外，还作为铁系化工产品的原料。因此，烧渣中铁含量的测定是保证产品质量的关键。     

聚合硫酸铁的制备及在造纸废水处理中的应用

对用硫铁矿烧渣制备聚合硫酸铁进行了研究 ,考察了影响烧渣酸浸、水解聚合及稳定性的各种因素。中试结果表明 ,在试验条件下 ,可以得到比重为 1 .58g/mL ,浓度为 1 80 g/L的棕色粘稠高浓度和高稳定性的液体聚合硫酸铁产品。用其对造纸废水处理时 ,CODCr的去除率可达 80 %。     

固体聚合硫酸铁结构及其热变化

硫铁矿烧渣;热性能;固体聚合硫酸铁结构及其热变化     

氯酸钠氧化法制备超细氧化铁黄的研究

利用氯酸钠氧化硫酸亚铁工艺制备超细氧化铁黄,制备过程中采用低成本的氨水合成氢氧化铁。制备过程包括亚铁盐水溶液的氧化、氢氧化铁胶体的合成和转化以及产物的表面处理。产物是分布在长100～230 nm,宽15～30 nm范围的针状粒子。通过X-射线衍射鉴别晶相,利用X-射线衍射和透射电镜测定产物的粒径,考察了反应温度等多种因素对样品的色相和粒径的影响。     

硫铁矿制硫化铁机理的初步探讨

本文探讨了用硫铁矿(FeS_2)为原料,掺入适量铁屑,在还原性气氛中加热制备硫化铁的机理。用化学分析法和矿相分析法研究了硫铁矿离解的物理化学过程、矿物的物相变化以及铁屑所起的作用。从理论上阐明以硫铁矿为原料制备硫化铁的可能性。     

钛白副产物硫酸亚铁制取氧化铁红颜料及其包膜的研究

以硫酸法生产钛白的副产物硫酸亚铁为原料,用干法制备了氧化铁红颜料。用均匀沉淀法对氧化铁红颜料进行二氧化钛包膜处理,以改善其表面光泽,并分析了影响包膜的工艺因素及影响包膜氧化铁红光泽性能的工艺因素。     

硫酸烧渣氰化法提金前的氨水预处理

硫酸烧渣 (以下简称烧渣 )的综合利用 ,在国外已有专利技术 ,而国内对其综合利用的研究与开发还很不深入 ,目前仅以 2 0～ 30元 /Ｔ的价格卖给水泥厂烧制水泥 ,其有效价值未得到充分的利用。从烧渣中提取黄金是其综合利用的一项重要内容 ,在黄金的工业生产中以氰化法的工艺最为成熟 ,生产成本也最低。但烧渣中含有较高的Ｚｎ、Ｃｕ ,若不预先将其除去而直接进行氰化浸出 ,则每吨烧渣将消耗 1 5～ 1 8ｋｇＮａＣＮ。仅此一项 ,将会导致亏损。Ｃｕ的存在不仅增加ＮａＣＮ的消耗量 ,而且还会使Ａｕ的氰化浸率严重下降。国内在处理富含黄铜矿的…     

Effect of Calcium Oxide Additive on the Performance of Iron Oxide Sorbent for High-Temperature Coal Gas Desulfurization

The effect of calcium oxide additive in iron oxide sorbent for hot gas desulfurization was investigated by XRD and TPR techniques.XRD characterization showed that CaO was highly dispersed after the calcination of sorbents.Calcium sulfate formed in the desulfurization was decomposed and regenerated to CaO by reacting with CO before the next sulfidation process.Calcium participated in every sulfidation/regeneration cycle and contributed to the enhancement of sulfur capacity.The TPR results showed that the reduction temperature of the sorbent increased with the increase of the content of calcium.Calcium played a role of retarding reduction.Therefore,the addition of calcium oxide additive will benefit the utilization of iron oxide sorbent in strongly reducing atmospheres.     

Liquid-Phase Synthesis of Iron Oxide Nanostructured Materials and Their Applications

Owing to their high natural abundance, low cost, easy availability, and excellent magnetic properties, considerable interest has been devoted to the synthesis and applications of iron oxide nanostructured materials. Liquid-phase synthesis methods are economical and environmentally friendly with low energy consumption and volatile emissions, and as such have received much attention for the preparation of iron oxide nanostructured materials. Herein, the liquid-phase synthesis methods of iron oxide nanostructured materials including the co-precipitation method, microemulsion method, conventional hydrothermal and solvothermal methods, microwave-assisted heating method, sonolysis method, and other methods are summarized and reviewed. Many iron oxide nanostructured materials, self-assembled nanostructures, and nanocomposites have been successfully prepared, which are of great significance to enhance their structure-dependent properties and applications. The specific roles of liquid-phase chemical reaction parameters in regulating the chemical composition, structure, crystallinity, morphology, particle size, and dispersive behavior of the as-prepared iron oxide nanostructured materials are emphasized. The biomedical, environmental, and electrochemical energy storage applications of iron oxide nanostructured materials are discussed. Finally, challenges and perspectives are proposed for future investigations on the liquid-phase synthesis and applications of iron oxide nanostructured materials.     

纳米介孔氧化铁的制备*

纳米氧化铁的许多优异性能使其成为广泛的研究热点。本文介绍了纳米氧化铁的制备及其颗粒大小、形貌控制等方面的进展状况。综述了各种不同形态介孔氧化铁及含铁介孔纳米复合材料的研究进展,结合课题组的研究工作,重点评述了介孔氧化铁的制备进展,并对该领域的研究方向和需要解决的问题提出了自己的观点。     

氧化铁磁性纳米粒子固定化酶*

纳米粒子作为酶固定化的载体,当其具有磁性时,制备的固定化酶易于从反应体系中分离和回收,操作简便;并且利用外部磁场可以控制磁性材料固定化酶的运动方式和方向,替代传统的机械搅拌方式,提高固定化酶的催化效率。在众多纳米材料中,氧化铁因其在磁性、催化等多方面的良好特性而倍受瞩目。本文对近年来各种氧化铁磁性纳米粒子固定化酶,尤其是固定化脂肪酶和蛋白酶的制备方法及其应用做了较为详细的阐述,对这些氧化铁磁性纳米粒子固定化酶的优缺点和发展前景进行了讨论。     

Effect of Calcium Oxide Additive on Sorbent for High-Temperature the Performance of Iron Oxide Coal Gas Desulfurization

The effect of calcium oxide additive in iron oxide sorbent for hot gas desulfurization was investigated by XRD and TPR techniques. XRD characterization showed that CaO was highly dispersed after the calcination of sorbents. Calcium sulfate formed in the desulfurization was decomposed and regenerated to CaO by reacting with CO before the next sulfidation process. Calcium participated in every sulfidation/regeneration cycle and contributed to the enhancement of sulfur capacity. The TPR results showed that the reduction temperature of the sorbent increased with the increase of the content of calcium. Calcium played a role of retarding reduction. Therefore, the addition of calcium oxide additive will benefit the utilization of iron oxide sorbent in strongly reducing atmospheres.     

还原温度对氧化铁吸附性能的影响

利用脉冲气相色谱保留体积法测定了不同还原温度的氧化铁样品对水的吸附特性并和Ｘ光衍射结果进行了关联,同时测定了含铬氧化铁对水的吸附特性。结果表明,中温还原样品有比较均匀的表面,低温和高温还原样品的表面均有一定程度的不均匀性且符合焦姆金吸附方程。铬的加入降低了氧化铁对水的吸附热,并增加吸附中心的数量     

火焰原子吸收分光光度法测定五氧化二钒中铁及氧化钾、氧化钠含量

五氧化二钒样品用盐酸分解,在稀盐酸介质中,用原子吸收分光光度计分别于248.3,766.5,589.0 nm波长处,使用空气–乙炔火焰,测量五氧化二钒中铁及氧化钾、氧化钠含量。在最佳实验条件下,铁、氧化钾、氧化钠的质量浓度分别在0.05~0.20,0.05~0.80,0.20~1.0 mg/L范围内与吸光度线性关系良好,相关系数分别为0.998 6,0.994 3,0.994 2。方法检出限铁为6.7μg/L,氧化钾为1.0μg/L,氧化钠为1.4μg/L,加标回收率为95.9%~103.0%。铁、氧化钾、氧化钠测定结果的相对标准偏差分别为3.2%,4.2%,2.9%(n=6)。该方法适合五氧化二钒中铁及氧化钾、氧化钠的测定。     

Micronization of Iron Oxide Particles Using Gas Antisolvent Process

Iron oxide particles were micronized by supercritical carbon dioxide (CO₂) as an antisolvent in a batch gas antisolvent (GAS) process. In the present study, the feasibility of GAS process to micronize the iron oxide particles using dimethyl sulfoxide (DMSO) as a solvent was investigated. In this direction, particle size and morphology changes were investigated with changing solution pressure (80–150 bar), temperature (308.15–328.15 K), and concentration (1.5–6 g/l). Based on the different experimental conditions, the particle size of the original iron oxide was decreased in the range of 17.25 to 4.23 µm, which shows a the success of the GAS process to reduce the particle size of the intact iron oxide particles. Simultaneously, morphology changes were observed starting from the irregular morphology for synthesized particles to more regular shapes that included fused and spherical-fused particles.     

纳米多孔阳极氧化铁膜的形成及其形貌演变

阳极氧化法制备具有纳米多孔结构的阳极氧化铁膜因其潜在的应用价值而倍受关注。然而,在阳极氧化过程中多孔结构的形成机制至今尚不清楚。本文结合电流密度-电位响应（I-V曲线）及法拉第定律的推导,分析了形成纳米多孔阳极氧化铁膜的过程中阳极电流的组成。结果表明,离子电流（导致离子迁移形成氧化物）和电子电流（导致析出氧气）共同组成阳极电流,并且纳米多孔阳极氧化铁膜的形成与两种电流的占比相关。分段式氧化物之间的空腔以及在阳极氧化初期纳米孔道上覆盖的致密膜,表明氧气泡可能是从氧化膜内部析出。此时,阳离子和阴离子绕过作为模具的氧气泡实现传质,最终导致纳米多孔结构的形成。此外,在阳极氧化铁膜形貌演变过程中,氧气泡不断向外溢出会使表面氧化物被冲破,导致表面孔径不断增大。