铬渣烧结矿炼制含铬生铁工业化生产试验研究

采用铬渣烧结矿作为熔剂,在３０ｍ＾３小高炉上进行了冶炼含铬生铁的工业化生产试验,铬河中六价铬的还原率接近１００％,总铬的金属化还原率大于９４％,平均每吨产品铁吃渣量为２．２９８ｔ,最高达２．７８５ｔ。炼制含铬最大于１０％铁含铬生铁,需同时配入铬铁矿增铬,保持１４８０Ｋ以上的炉温,控制较低的碱度,配入辅料降低炉渣溶点,可显著善炉渣的流动性,成功地实现渣,铁分离排放。监测了试验过程的二次污染,需控制高     

硫铁矿烧渣制取铁红

研究了以硫铁矿烧渣为原料制备铁红的工艺过程及原理,详细探讨了合成反应的各种影响因素及煅烧工艺条件。采用该工艺可使烧渣中氧化铁浸出率达92％,铁红纯度达96．5％。铁红产品质量符合GB1863-89一级品标准。     

污垢系数对热交换器的影响

环保、冶金及建材行业余热利用中的热交换器,常因管内污垢系数上升、换热面粘附粉尘而失效.研制用于某硅铁电炉高温烟尘治理余热利用中设有脉冲喷吹自动清灰装置的热交换器,可有效解决因粉尘粘附而导致的传热系数下降,从而保证了换热器长期稳定运行.     

高炉原料矿槽槽上除尘方式综述

槽上卸料车及矿槽口尘源点具有移动性特征,有效的矿槽槽口密闭以及可靠的随卸料车移动的风管连接装置,是保证除尘良好效果的要点.常用的除尘方法各有其特点和适用条件,应根据作业方式及矿槽结构状况有针对性的采用.     

涂铁石英砂吸附水中Cr（Ⅵ）的研究

采用静态吸附和动态过滤的试验方法研究了涂铁石英砂（IOCS）滤料对水中Cr（Ⅵ）的去除,并探讨其吸附机理。研究结果表明,Cr（Ⅵ）在IOCS上的吸附平衡符合Langmuir吸附模型。经氧化铁改性滤料表面电位带正电荷,对水中的Cr（Ⅵ）有良好的去除效果。pH值对Cr（Ⅵ）的去除影响较大,随着溶液的pH值升高,滤料表面电位减小,Cr（Ⅵ）的吸附率也减小。IOCS滤料去除Cr（Ⅵ）机理主要为静电吸附。     

Effects of initial iron corrosion rate on long-term performance of iron permeable reactive barriers: Column experiments and numerical simulation

Column experiments and numerical simulation were conducted to test the hypothesis that iron material having a high corrosion rate is not beneficial for the long-term performance of iron permeable reactive barriers (PRBs) because of faster passivation of iron and greater porosity loss close to the influent face of the PRBs. Four iron materials (Connelly, Gotthart-Maier, Peerless, and ISPAT) were used for the column experiments, and the changes in reactivity toward cis-dichloroethene (cis-DCE) degradation in the presence of dissolved CaCO₃ were evaluated. The experimental results showed that the difference in distribution of the accumulated precipitates, resulting from differences in iron corrosion rate, caused a difference in the migration rate of the cis-DCE profiles and a significant difference in the pattern of passivation, indicating a faster passivation in the region close to the influent end for the material having a higher corrosion rate. For the numerical simulation, the accumulation of secondary minerals and reactivity loss of iron were coupled using an empirically-derived relationship that was incorporated into a multi-component reactive transport model. The simulation results provided a reasonable representation of the evolution of iron reactivity toward cis-DCE treatment and the changes in geochemical conditions for each material, consistent with the observed data. The simulations for long-term performance were also conducted to further test the hypothesis and predict the differences in performance over a period of 40 years under typical groundwater conditions. The predictions showed that the cases of higher iron corrosion rates had earlier cis-DCE breakthrough and more reduction in porosity starting from near the influent face, due to more accumulation of carbonate minerals in that region. Therefore, both the experimental and simulation results appear to support the hypothesis and suggest that reactivity changes of iron materials resulting from evolution of geochemical conditions should be considered in the design of iron PRBs.     

一种新型光催化剂用于降解腈纶废水研究

将1,10菲啰啉和铁Fe2+溶液配成络合物负载到D113树脂上作为可见光催化剂,利用该催化剂对腈纶废水进行了降解研究,考察了该负载型铁氮配合物催化剂处理腈纶废水的影响因素。由实验结果可知,该催化剂处理腈纶废水最佳条件为：过氧化氢浓度为400 mg/L,催化剂用量为5 g/L,最佳pH值范围为4～9,COD降解率可达68.7%,实现了在温和的反应条件下,即常温、常压、宽pH范围进行反应,充分利用了可见光来处理难降解有机物。     

钢铁企业开放空间煤气扩散规律研究

研究目的是探索钢铁企业开放空间煤气泄漏的扩散规律和影响范围。采用matlab模拟煤气泄漏后CO的浓度分布和扩散距离规律。通过建立煤气泄漏扩散数学模型,对其影响煤气气扩散的主要因素进行了分析、探讨了煤气毒性范围的划分,并以某钢铁企业为实例进行数值模拟和计算。模拟结果显示,大气稳定度、风速对煤气泄漏扩散的浓度影响起着非常重要的作用。大气稳定度和风速会显著改变有害气体的扩散状态。在风速和泄漏增大时,煤气在开放空间扩散距离大,影响范围广,应合理布置煤气监控点,预防煤气中毒。     

Anaerobic biodegradation of benzene series compounds by mixed cultures based on optional electronic acceptors

A series of batch experiments were performed using mixed bacterial consortia to investigate biodegradation performance of benzene, toluene, ethylbenzene and three xylene isomers （BTEX） under nitrate, sulfate and ferric iron reducing conditions. The results showed that toluene, ethylbenzene, m-xylene and o-xylene could be degraded independently by the mixed cultures coupled to nitrate, sulfate and ferric iron reduction. Under ferric iron reducing conditions the biodegradation of benzene and p-xylene could be occurred only in the presence of other alkylbenzenes. Alkylbenzenes can serve as the primary subs＇rates to stimulate the transformation of benzene and p-xylene under anaerobic conditions. Benzene and p-xylene are more toxic than toluene and ethylbenzene, under the three terminal electron acceptors conditions, the degradation rates decreased with toluene 〉 ethylbenzene 〉 m-xylene 〉 o-xylene〉 benzene 〉 p- xylene. Nitrate was a more favorable electron acceptor compared to sulfate and ferric iron. The ratio between sulfate consumed and the loss of benzene, toluene, ethylbenzene, o-xylene, m-xylene, p-xylene was 4.44, 4.51, 4.42, 4.32, 4.37 and 4.23, respectively; the ratio between nitrate consumed and the loss of these substrates was 7.53, 6.24, 6.49, 7.28, 7.81, 7.61, respectively; the ratio between the consumption of ferric iron and the loss of toluene, ethylbenzene, o-xylene, m-xylene was 17.99, 18.04, 18.07, 17.97, respectively.     

Suwannee河黄腐酸光化学生成溶解无机碳的研究

用模拟太阳光照射Suwannee河黄腐酸以模拟光氧化过程,研究了溶解氧浓度、模拟太阳光波长范围和铁浓度对溶解无机碳产量的影响.结果表明,氧气饱和样品的溶解无机碳生成速率比空气饱和条件下(3.32 μmol/(L·h))增加了40.1%(以照射过程中线性回归的生成速率计算); 实验以Mylar-D、有机玻璃UF-3和有机玻璃UF-4为滤光片研究了波长范围对溶解无机碳产量的影响,近似计算的结果表明UV-B、UV-A 和可见光部分分别占全波段模拟太阳光光化学生成无机碳产量的43%、42% 和 15%; 当样品铁浓度达到10 μmol/L时,其溶解无机碳的生成速率约为初始样品(Suwannee河黄腐酸铁浓度为1.90 μmol/L)的2.8倍,证实了铁在光化学氧化过程中的催化作用.