高铁酸钾的合成及其应用研究

利用次氯酸盐氧化法合成Ｋ２ＦｅＯ４,对其合成方法进行了探索和改善。用亚砷酸钠法准确地测定了Ｋ２ＦｅＯ４ 的纯度。在不同条件下,研究了Ｋ２ＦｅＯ４ 对水样中Ｓ２－ 和ＣＮ－ 的处理效果。     

高碱度条件下FeO对烧结矿性能的影响

FeO是烧结矿的主要成分,对烧结矿强度与冶金性能有重要影响。国内外都推行低FeO烧结,如何寻求既要提高烧结矿还原性又不降低强度是研究FeO的关键。攀钢烧结矿碱度（R）达到2.5左右,进行了FeO对烧结矿性能影响与FeO的影响因素实验。实验结果表明,强度、利用系数、成品率随FeO的上升而提高,FeO达一定值后指标亦达最大值,具有典型的二次曲线特性;随FeO的上升,还原性变差,低温还原粉化率改善。w（FeO）控制在7.24％～844％可兼顾质量、能耗、冶金性能等各种指标在最佳范围。在燃料配比不变的前提下,碱度、水分、SiO2、Al2O3、返矿用量任何一个因素量的上升均会导致FeO的下降,进而影响生产技术指标,因此须适当提高配炭量。     

水热法合成Bi25FeO40纳米粉体的研究

本文以Fe(NO3)39H2O和Bi(NO3)35H2O为起始物料,NaOH为沉淀剂和矿化剂,利用水热合成技术制备了Bi25FeO40纳米粉体.利用XRD、SEM和TEM等分析测试手段对所制得Bi25FeO40粉体的物相组成和晶粒形貌等性质进行了研究,并详细讨论了水热反应温度、反应时间和矿化剂浓度等对晶体生长和粉体制备的影响.结果表明,采用这种低温水热技术制备出的产品为纯的Bi25FeO40陶瓷粉体,在微观结构上呈现出三角锥和立方体结构,最佳工艺条件为[Fe]=[Bi]=0.2mol/L,矿化剂[NaOH]=0.5mol/L,在180℃水热反应24h.     

Hydrogen production by hydrothermal oxidation of FeO under acidic conditions

The production of H₂ by oxidation of FeO, taken here as model compound for steel slags, has been investigated both in pure water and under acidic aqueous conditions in the 373–573 K temperature range. Whereas after 65 h, H₂ yield was negligible in pure water at 423 K, the reaction 3 FeO_(s) + H₂O_(l) → Fe₃O_4(s) + H_2(aq) reached near completion at the same temperature within 10 h in a solution containing 0.05 mol/l acetic acid. Increasing acetic acid concentration by one order of magnitude did not yield significantly more H₂. At identical initial pH, acetic acid was found to be more efficient than oxalic acid and hydrochloric acid at enhancing H₂ production. Acidic conditions increased FeO dissolution kinetics and, consequently, improved H₂ yield. The specific efficiency of acetic acid resides in its thermal stability as well as in the potential of ligand-promoted Fe(II) dissolution. We show that the positive kinetics effect of mild acetic acid solutions over H₂ yield evidenced on FeO does not apply directly to steel slags which buffer the pH to high values due to the presence of large amounts of CaO.     

w(SiO2)/w(V2O3)对含钒炉渣熔化温度及黏度的影响

摘要：为了对转炉提钒冶炼过程含钒炉渣熔化和流动性进行合理的控制，采用半球点法和内旋转黏度法分别测试了含钒炉渣熔化温度和黏度，采用XRD测试了含钒炉渣的物相，并采用综合碱度（BI′）反映渣中酸碱氧化物平衡关系。结果表明，在FeO质量分数一定的条件下，随着w（SiO2）/w（V2O3）增大，综合碱度由BI′>1单调下降至BI′<1，含钒炉渣熔化温度先降低后升高；随着FeO质量分数的增加，熔化温度最低点对应的w（SiO2）/w（V2O3）增大。随着w（SiO2）/w（V2O3）增大，黏度随温度变化的趋势变缓，高温熔融态含钒炉渣黏度增大，低温阶段黏度减小。综合考虑黏度对钢渣界面反应和钒渣流失的影响，FeO质量分数为44%时含钒炉渣w（SiO2）/w（V2O3）应控制为0.7。     

钛白废酸在过磷酸钙生产中的应用

硫酸法钛白粉生产会产生w（H2SO4）21％、w（FeO）5．6％的废酸,如直接用于过磷酸钙生产,因FeO存在会造成硫酸输送管道堵塞,过磷酸钙结块和有效磷退化。介绍除去废酸中FeO的工艺技术,可使酸中的Ⅲ（FeO）降至0．27％。几年来回收废酸（折纯100％）4．63万t,合计创效益3240万元。     

CaO-SiO2-Al2O3-MgO-FeO渣系FeO活度的计算模型

利用熔渣结构共存理论建立了CaO-SiO2-Al2O3-MgO-FeO渣系FeO活度的计算模型,并分析了1400℃时炉渣碱度、MgO和FeO含量对该渣系FeO活度的影响规律。结果表明：当CaO-SiO2-Al2O3-MgO-FeO渣系三元碱度为1.3,Al2O3含量为12wt%,FeO含量为2wt%条件下,随MgO含量的增加,炉渣FeO活度增大;当二元碱度为1.1,Al2O3含量为12wt%,MgO含量为10wt%时,FeO活度随随渣中FeO含量的增加呈线性增加;当渣中Al2O3、MgO和FeO含量分别为12wt%、10wt%和2wt%固定不变时,随着二元碱度的提高,炉渣FeO活度迅速增加。计算得到的上述规律和实测规律一致,说明了本模型用于分析FeO活度的正确性。     

提高武钢二烧烧结矿转鼓指数的生产实践

烧结矿转鼓指数是衡量烧结矿质量的重要指标。武钢二烧车间通过稳定原料配比、严格控制燃料粒度、加强生产操作、改善铺底料系统、改善混合料布料、提高烧结矿FeO含量稳定率和Ro稳定率等一系列有效的措施,使该车间烧结矿转鼓指数从2009年的78.84%提高到2011年的79.66%。     

绿色氧化剂K2FeO4对瓜尔胶的降解实验研究

瓜尔胶在油田压裂液中作为稠化剂被广泛使用,作业后的压裂返排液中瓜尔胶难以自然降解,对环境造成严重危害;探索绿色高效处理油田压裂返排液的方法成为研究的热点和难点.本实验以K2FeO4为绿色高效氧化剂,对模拟压裂返排液(质量浓度为0.3‰瓜尔胶溶液)进行了降解实验研究,结果表明,当K2FeO4用量为0.5 g/L,反应温度30 ℃,反应pH值为12.0时,溶液降黏率最大可达89.27%,COD去除率为36.27%,且氧化剂反应为三价铁离子,绿色无污染.     

Fe Vacancies Induced Surface FeO6 in Nanoarchitectures of N‐Doped Graphene Protected β‐FeOOH: Effective Active Sites for pH‐Universal Electrocatalytic Oxygen Reduction

Developing high‐active, good‐stable, and cost‐effective electrocatalyst for oxygen reduction reaction (ORR) in all‐pH medium is highly desired for the application of various fuel cell systems. Here, a network architecture hybrid with porous nitrogen‐doped graphene encapsulated β‐FeOOH nanoparticals (β‐FeOOH/PNGNs) as ORR electrocatalyst, which exhibits remarkable enhancement ORR performance in terms of activity and stability in pH‐universal medium is reported. Systematic characterization combining with X‐ray absorption fine structure analysis and the first principles simulations reveal that the as‐formed surface FeO₆ active sites that induced by a mass of Fe vacancies in β‐FeOOH/PNGNs can significantly lower the thermodynamic barrier of the total reaction, and hence contribute to a remarkable enhancement in ORR activity.