Fe/污泥基生物炭持久活化过硫酸盐降解酸性橙G

利用污泥基生物炭（SDBC）固定铁物质制备了一种污泥基非均相催化剂（Fe-SDBC）,用于活化过硫酸盐（PS）以降解酸性橙G（OG）.Fe-SDBC/PS体系显示出对OG优异的降解性能.评价了影响降解的因素（Fe-SDBC金属负载量、Fe-SDBC投加量、初始pH值和PS浓度）.并通过X射线荧光光谱仪（XRF）、傅立叶变换红外分析仪（FT-IR）和拉曼光谱仪（Raman）对Fe-SDBC进行了表征.自由基清除剂实验表明,SO₄^·-和OH·自由基均在降解过程中生成,且活化PS历程主要发生在非均质催化剂表面.分析Fe-SDBC活化PS的潜在机理,表明不同形式的铁物质是PS分解的主要贡献者,Fe²⁺/Fe³⁺的转化循环提高了Fe-SDBC持久活化PS的效果.Fe-SDBC循环实验表明其对活化PS具有较好的可重用性,连续3次24h降解高浓度污染物仍能发挥作用.综上所述,Fe-SDBC作为一种污泥基非均相催化剂可以持久活化PS,从而实现OG的降解.     

膜分离技术在钢铁废水处理中的应用研究

针对我国钢铁行业产生的废水特征,分析了膜分离法在废水处理中的应用,包括微滤法在去除废水中的悬浮物、胶体和微生物的应用,超滤法在冷轧废水中除油的工艺和超滤在反渗透进水前的预处理过程,以及反渗透法对废水的脱盐工艺;总结了膜分离技术存在的问题。     

FeS-Fe0纳米复合材料活化过硫酸盐降解双酚S的研究

双酚S(BPS)是一种新兴的内分泌干扰物,在环境中广泛存在,并对自然环境和人体健康有严重危害。制备了FeS-Fe⁰纳米复合材料作为催化剂,明确了FeS-Fe⁰纳米复合材料活化PS体系(FeS-Fe⁰/PS体系)的反应条件对去除BPS的影响,包括材料中FeS与Fe⁰摩尔比、材料投加量、PS浓度、溶液初始pH值等,并应用X射线衍射分析、X射线光电子能谱分析等技术表征该复合材料,通过反应体系对比实验、Fe离子溶出实验、PS的消耗实验、猝灭实验、电子顺磁共振波谱检测,探究了FeS-Fe⁰纳米复合材料的活化机理。实验结果表明:FeS-Fe⁰/PS体系降解BPS的最优条件为溶液初始pH=3、FeS与Fe⁰摩尔比1∶25、材料投加量0.10 g/L、PS浓度1.0 mM;FeS-Fe⁰/PS体系中产生的硫酸根自由基(SO₄^·-)和羟基自由基(HO·)可降解BPS,且HO·占主导作用;FeS-Fe⁰纳米复合材料表面的FeS促进了铁离子的溶出和循环,因此其活化能力优于纳米零价铁。     

钢铁企业安全生产现状与问题分析

随着我国钢铁企业安全生产标准化的不断深入开展，钢铁企业安全生产状况趋于稳步好转。本文分析了钢铁企业安全生产的现状，并就近年来大中型钢铁企业安全生产事故情况进行了统计分析，对存在的问题进行了深入的探讨，提出了相应的改进对策与建议。     

Effect of sulfur and composted manure on SO4-S,P and micronutrient availability in a calcareous saline–sodic soil

A factorial design with different levels of elemental S and cow manure was used to investigate the effects of S and manure on SO₄-S, P and micronutrient availability in a calcareous saline–sodic soil. The results revealed that the recovery of SO₄-S increased significantly (p≤0.05) in all treatments as elemental S increased, particularly when in combination with manure. The interactional effects of S° and manure application rates resulted in a decrease in soil pH of 0.1 to 0.9 units and increases in soil EC from 0.1 to 2.6 dS m^?1 as result of an increase in the number of oxidisers and the oxidation rate of elemental S. Application of S° in combination with manure led to an increase in soil-available-P (0.6–40 mg kg^?1), DTPA-Zn (0.2–3.9 mg kg^?1) and DTPA-Fe (0.1–5.6 mg kg^?1).     

腐殖酸对As(V)在覆铁砂介质中吸附行为的影响

对腐殖酸(HA)进行了成分分析及红外表征,并从HA浓度、pH值、As(Ⅴ)初始浓度等方面,研究了HA对As(Ⅴ)在覆铁砂介质中吸附行为的影响.结果表明,随着HA浓度的升高,总砷去除率逐渐降低.当HA浓度增加到25mg.l-1时,与不存在HA条件下相比,总砷去除率降低了12%左右.溶液pH值影响As(Ⅴ)的去除,pH值从6升高到8时,总砷去除率从52.1%降到了39%.其中的作用机理主要是HA与As(Ⅴ)在覆铁砂表面形成竞争吸附,HA争夺了As(Ⅴ)的吸附点位.此外,HA与Fe(Ⅲ)的络合作用也是导致覆铁砂对砷的去除率降低的一个重要原因.     

有机酸-铁改性活性炭去除饮用水中的砷

利用有机酸(柠檬酸和EDTA)螯合铁加载来改性活性炭,采用动态活性炭小柱进行吸附穿透实验来检测改性后活性炭对砷的吸附能力.研究表明,加载到活性炭上的铁的量随着有机酸和铁浓度增加而增加,在EDTA和铁的浓度分别为0.1mol/L时,活性炭上的铁含量从未加载时的0.24%升至6.18%.改性后的活性炭对砷吸附能力有显著增加,EDTA-Fe改性后的活性炭对As(V)和As(III)穿透时,运行的床体积达到未改性活性炭的10倍.一般情况下,低pH对As(V)的吸附有利.在水体常见pH值范围内(pH 6~9),As(III)的吸附受到影响较小.活性炭上用有机酸螯合法加载的铁大部分以不定形的形式存在,且晶体化效果不明显.     

钢渣中磁性矿物的赋存特性对分选效果的影响研究

对新余钢铁公司0～10 mm的细粒钢渣干式磁选分离所得到的产品进行扫描电镜检测、分析,找出了影响细粒钢渣干式磁选指标难以得到提高的原因,用于指导生产实践。研究结果表明:钢渣在干式磁选过程中,包裹有微细粒的金属铁或与金属铁连生的浮氏体以及具有一定磁性的铁酸盐容易进入磁性分离物中,这些物质自身铁品位较低,从而造成了磁性分离物中铁品位的降低。     

Phytoaccumulation of iron by callus tissue of Clerodendrum indicum (L)

Clerodendrum indicum (L.) is one of the important medicinal plants, originating in India. The plant is used as medicine for bronchitis, asthma and different immunological disease. Micro-propagation is a quick method, producing a huge number of plants. Apical leaf of Clerodendrum indicum (L.) was used as an explant for callogenesis. The combinations of different plant growth regulators (2,4-D, NAA, KN) in MS (Murashige and Skoog) medium produced two types of calli: one was friable and loose and the other was green, embryogenic and compact. Heavy metals cause pollution and health hazards. The plant absorbs heavy metals, which is very useful for controlling environmental pollution. Iron is a major nutrient for both plants and animals, but hyper accumulation of iron is injurious to health. Calli were used to study the optimum conditions of iron uptake in presence of different chemical environments. The different environments were created by using different chemical reagents such as (HCL, HNO₃, H₃PO₄ and KNO₃). Iron (III) was spiked with radioactive Fe-59 and dynamics of uptake was followed by measuring radioactivity by gamma-ray spectrometer. The best condition of iron uptake corresponded to 1 mol L^?1 KNO₃ after 4 hour of equilibration.     

Acid mine drainage attenuation by inhibition of pyrite bioleaching using limestone and olive pomace

The control and inhibition of pyrite bioleaching involved in the generation of acid mine drainage was studied. Inhibition of pyrite bioleaching was performed by varying the pyrite concentration in the medium (substrate inhibition) and/or by addition of limestone (inhibition by pH increase) and olive pomace (inhibition by organic compounds). Inhibition tests of pyrite bioleaching were performed according to a full factorial design with three factors (pyrite, limestone and olive pomace) taken at two levels. Preliminary pyrite bioleaching tests showed the ability of the available inoculum to oxidise the mineral. Subsequently, experimental data for total soluble iron denoted strong inhibition under all the different operating conditions of the factorial design, except when larger pyrite concentrations were used. In particular, inhibition by limestone was due to the increase in pH which negatively affects microorganisms, while inhibition by olive pomace may be related to the antioxidant properties of polyphenols. Interactions among operating conditions were specifically assessed by analysis of variance. Only limestone and/or pomace addition resulted in a significant (95%) diminution of iron extraction.