高钛型高炉渣与硫酸铵焙烧过程中反应产物的变化与形成机理研究     

周国彪  彭同江  孙红娟  梁亚琴 《岩石矿物学杂志》2013,32(6):893-898

高钛型高炉渣富含TiO₂,是一种重要的矿物资源。为实现其中TiO₂的富集,研究了其与硫酸铵的混合物在焙烧过程中反应产物的变化及形成机理。采用TG-DTA和XRD对高钛型高炉渣与硫酸铵混合物的热效应变化和原料及焙烧产物的物相组成进行了表征。结果表明,高钛型高炉渣主要矿物组成为钙钛矿、透辉石和镁铝尖晶石,其与硫酸铵的混合物在加热过程中存在3个明显的吸热效应,为硫酸铵自身分解反应及与高钛型高炉渣中金属氧化物的反应和所形成的中间产物的分解反应所引起。在较低的焙烧温度下,硫酸铵分解产物为(NH₄)₃H(SO₄)₂,其与钙钛矿和透辉石中的金属氧化物反应可形成CaSO₄;在焙烧温度为300～375℃时,镁铝尖晶石中的Al₂O₃与(NH₄)₂SO₄和(NH₄)₃H(SO₄)₂反应形成(NH₄)₃Al(SO₄)₃;在375～425℃时,(NH₄)₃Al(SO₄)₃与Al₂O₃反应形成NH₄Al(SO₄)₂;焙烧温度升高至500℃时,NH₄Al(SO₄)₂发生分解生成Al₂(SO₄)₃。  相似文献   

Origins of High H_2S-bearing Natural Gas in China   总被引：2，自引：0，他引：2  

ZHU Guangyou  ZHANG Shuichang  LIANG Yingbo  DAI Jinxing  LI Jian Research Institute of Petroleum Exploration  Development  China National Petroleum Corporation  Beijing 《《地质学报》英文版》2005,79(5):697-708

Natural gas containing hydrogen sulphide （H2S） has been found in several petroliferous basins in China, such as the Sichuan Basin, Bohai Bay Basin, Ordos Basin, Tarim Basin, etc. Natural gas with higher HES contents （HES 〉5 % mol.） is mostly distributed in both the gas reservoirs of Dukouhe, Luojiazhai, Puguang and Tieshanpo, which belong to the Triassic Feixianguan Formation in the northeastern Sichuan Basin and those of the Kongdian-Shahejie formations in the northeastern Jinxian Sag of the Jizhong Depression, Bohai Bay Basin. In the Sichuan Basin, the HES contents of natural gas average over 9% and some can be 17 %, while those of the Bohai Bay Basin range from 40 % to 92 %, being then one of the gas reservoirs with the highest H2S contents in the world. Based on detailed observation and sample analysis results of a total 5000 m of core from over 70 wells in the above-mentioned two basins, especially sulfur isotopic analysis of gypsum, brimstone, pyrite and natural gas, also with integrated study of the geochemical characteristics of hydrocarbons, it is thought that the natural gas with high HES contents resulted from thermochemical sulfate reduction （TSR） reactions. Among them, the natural gas in the Feixianguan Formation resulted from TSR reactions participated by hydrocarbon gas, while that in the Zhaolanzhuang of the Jinxian Sag being the product of TSR participated by crude oil. During the consumption process of hydrocarbons due to TSR, the heavy hydrocarbons were apt to react with sulfate, which accordingly resulted in the dry coefficient of natural gas increasing and the carbon isotopes becoming heavier.  相似文献   

镀镍碳为还原剂在线高温裂解法测定硫酸钡中氧同位素组成     

金贵善  刘汉彬  韩娟  李军杰  张建锋  张佳  石晓 《岩矿测试》2019,38(4):365-372

测定矿物或水中硫酸根的氧同位素组成(δ18O)能够识别物质来源及转化过程,常用的方法是将硫酸根转化为硫酸钡再用离线或在线法测试其δ18O值。目前普遍采用1420℃在线测试硫酸钡的氧同位素组成,该方法极易缩短反应炉的寿命,通过添加还原剂碳可以降低反应温度,但是已有报道对于添加还原剂后的反应温度讨论较少。本文选择镀镍碳(Ni-C)作为还原剂,将样品经Ni-C高温处理后进行一系列条件实验,确认了采用元素分析仪-稳定同位素质谱仪(EA-IRMS)测定硫酸钡中氧同位素组成的分析方法的关键技术参数:硫酸钡在线反应温度为1350℃; Ni-C与硫酸钡样品量的质量比范围选择0. 73～2. 15;为了获得更加精确的数据,硫酸钡与Ni-C用量都控制在700±100μg。在以上实验条件下,EA/HT-IRMS测定硫酸钡δ18O值的精密度为±0. 12‰～±0. 26‰,优于在线法已报道的精密度±0. 20‰～±0. 50‰。本方法在满足测试精密度的前提下,通过添加Ni-C降低了硫酸钡在线反应温度,延长了反应炉使用寿命。  相似文献   

甘糖酯对大鼠尿激酶型纤溶酶原激活物(uPA)mRNA水平的影响   总被引：2，自引：2，他引：0  

马洪明  姚子昂  姜招峰  管华诗 《中国海洋大学学报(自然科学版)》1999,(4)

从分子水平上探讨海洋新药甘糖酯的抗栓作用机理。实验以大鼠为材料,采用定量ＲＴＰＣＲ方法定量检测口服甘糖酯后大鼠尿激酶型纤溶酶原激活物（ｕＰＡ）基因ｍ ＲＮＡ水平变化。研究表明大鼠口服甘糖酯后ｕＰＡ基因ｍ ＲＮＡ 水平高于对照组,差异显著。结论认为甘糖酯可提高体内ｕＰＡ基因的ｍ ＲＮＡ 水平,从而提高ｕＰＡ蛋白的活性,激活机体的纤溶系统,达到抗栓作用。  相似文献   

适用于条斑紫菜的双向电泳样品制备方法     

赵宇鹏  周伟  赵佩佩  才金玲  朱大玲  潘光华  刘洪艳  王广策 《海洋科学》2013,37(5):19-24

为了建立适于条斑紫菜(Porphyra yezoensis)蛋白质组学分析的的样品提取方法, 作者以条斑紫菜叶状体为材料, 比较了饱和硫酸铵沉淀法、三氯乙酸/丙酮沉淀法和酚提取方法3 种方法对条斑紫菜叶状体总蛋白的提取效果。结果表明, 针对条斑紫菜叶状体细胞中含有大量多糖, 多酚化合物, 色素等干扰物质的特点, 通过酚提取方法能有效去除这些干扰杂质, 得到清晰、稳定、干净的双向电泳图谱和相对较多的蛋白质点数, 为提高其他大型海藻的总可溶性蛋白提取效率提供了重要参考。  相似文献   

Acid drainage generation and associated Ca-Fe-SO₄ minerals in a periglacial environment, Eagle Plains, Northern Yukon, Canada: A potential analogue for low-temperature sulfate formation on Mars     

Denis Lacelle  Richard Léveillé 《Planetary and Space Science》2010,58(4):509-843

Near Eagle Plains, northern Yukon, Canada, acidic Ca-Fe-Mg sulfate waters are discharging year-long from disturbed permafrosted sandstone bedrock overlying pyritiferous black shales. These acidic waters are precipitating gypsum with minor amounts of jarosite-K (Na), schwertmannite and hematite. This mineral assemblage is similar to that observed at Meridiani Planum (and other location on Mars), making this site a valuable analogue for low-temperature sulfate geochemistry and mineral formation on Mars. Stable O-S isotope analysis of the acidic waters near Eagle Plains revealed that the oxygen in the dissolved sulfate is mostly derived from water (ca. 70%), suggesting that the sulfide oxidation process could be in part biomediated (i.e., accelerated by acidophilic Fe-oxidizing bacteria). However, unlike the dissolved sulfate in the waters, the formation of the Ca-Fe-SO₄ minerals appears to be purely abiotic. The stable O-S isotope composition of the sulfate minerals is well within the predicted equilibrium range at low temperature, suggesting that they formed through physico-chemical processes (i.e., evaporation or freezing). Low-temperature geochemical modeling with FREZCHEM and PHREEQC suggests that the mineral assemblage at Eagle Plains precipitated mainly through the freezing of Ca-Fe-Mg-SO₄ acidic waters, rather than through evaporation during the dry summer season, although the latter is still possible. This suggests that the sulfate mineral assemblage observed on Mars could have also formed under a periglacial-type climate. Considering that the active layer in the zone affected by acid drainage does not freeze-over during winter, the residual talik offers a localized niche environment to support acidophilic microorganisms. Overall, the fact that acid drainage is presently active near Eagle Plains allows the direct observation of the low-temperature geochemical processes responsible for generating acid drainage conditions and precipitation of gypsum, schwertmannite, jarosite-K, jarosite-Na, goethite and hematite.  相似文献   

A Study on Sulfate Optical Properties and Direct Radiative Forcing Using LASG-IAP General Circulation Model     

LI Jiandong  Zhian SUN  LIU Yimin  Jiangnan LI  Wei-Chyung WANG  WU Guoxiong 《大气科学进展》2012,29(6):1185-1199

The direct radiative forcing(DRF) of sulfate aerosols depends highly on the atmospheric sulfate loading and the meteorology,both of which undergo strong regional and seasonal variations.Because the optical properties of sulfate aerosols are also sensitive to atmospheric relative humidity,in this study we first examine the scheme for optical properties that considers hydroscopic growth.Next,we investigate the seasonal and regional distributions of sulfate DRF using the sulfate loading simulated from NCAR CAM-Chem together with the meteorology modeled from a spectral atmospheric general circulation model(AGCM) developed by LASG-IAP.The global annual-mean sulfate loading of 3.44 mg m 2 is calculated to yield the DRF of 1.03 and 0.57 W m 2 for clear-sky and all-sky conditions,respectively.However,much larger values occur on regional bases.For example,the maximum all-sky sulfate DRF over Europe,East Asia,and North America can be up to 4.0 W m 2.The strongest all-sky sulfate DRF occurs in the Northern Hemispheric July,with a hemispheric average of 1.26 W m 2.The study results also indicate that the regional DRF are strongly affected by cloud and relative humidity,which vary considerably among the regions during different seasons.This certainly raises the issue that the biases in model-simulated regional meteorology can introduce biases into the sulfate DRF.Hence,the model processes associated with atmospheric humidity and cloud physics should be modified in great depth to improve the simulations of the LASG-IAP AGCM and to reduce the uncertainty of sulfate direct effects on global and regional climate in these simulations.  相似文献   

2006年中国地区大气气溶胶浓度分布特征的模拟研究     

银燕  崔振雷  张华  辛金元  王莉莉 《南京气象学院学报》2009,32(5):595-603

结合2006年最新的气溶胶排放源资料,以NCEP/NCAR再分析资料为气象场,驱动大气化学传输模式MATCH（Model of Atmospheric Transport and Chemistry）,模拟了2006年中国地区硫酸盐、黑碳和沙尘气溶胶的质量浓度分布及其季节变化。模拟的气溶胶光学厚度（AOD）结果与CSHNET观测网数据比较分析后发现,基于21个观测站的61组月平均数据与相应模拟结果的相关系数为0.63。模拟结果表明：2006年中国地区硫酸盐气溶胶高值区主要分布在中国的四川盆地、华北及长江流域等工业较发达地区,而且具有明显的季节变化,四川盆地及长江以南地区,硫酸盐气溶胶1月份浓度高于7月份,长江以北的大部分地区,7月份浓度高于1月份;黑碳气溶胶主要分布在黄河、长江中下游地区及华南等地区,1月份浓度高于7月份;沙尘气溶胶主要分布在内蒙古中部沙漠地区,4月份浓度最高,7月份次之,其他月份较少。  相似文献   

新疆塔木铅锌矿成矿流体特征与矿床成因   总被引：2，自引：0，他引：2  

杨向荣  彭建堂  胡瑞忠  戚华文  刘燊 《地球化学》2009,38(6)

新疆塔木铅锌矿赋存于石炭系碳酸盐岩断层破碎带中,矿体和手标本尺度呈现管/脉构造特点。管/脉壁主要由闪锌矿、方铅矿构成,管/脉中心充填白云石Ⅱ,管内可见钡-钾长石微粒,暗示成矿流体淋滤下伏地质体。充填期白云石Ⅱ较第Ⅰ期白云岩化灰岩表现出贫13C、18O的特点,反映成矿过程可能存在贫13C、18O的物质加入。鉴于白云石Ⅱ流体包裹体均一温度为119～191℃、闪锌矿流体包裹体存在CH4、C2H6、H2S气相组分、邻区达木斯乡和什拉甫剖面下石炭统有4个沥青显示点和24个荧光显示点、麦盖提斜坡海相石炭系曲1井、麦3井原油δ13C介于-34‰～-31‰之间及流体包裹体液相组分未见SO42-,可以推测成矿作用与热化学硫酸盐还原(TSR)过程相关。综合上述因素,可以认为新疆塔木铅锌矿为后生的与TSR作用相关的矿床。  相似文献   

积云对二氧化硫和硫酸盐气溶胶作用的研究   总被引：1，自引：1，他引：0  

李冰  刘小红  洪钟祥 《气候与环境研究》2000,5(1):20-24

利用一个冰雹云模式与云化学模式耦合而成的二维积云化学模式,研究对流云的输送、微物理转化、云内化学过程、湿清除对SO2及硫酸盐气溶胶的作用。云化学模式的结果表明,由于SO2在向上输送的过程中可溶解于云水和雨水中,从而阻止了SO2向上部的转移,因此对气相SO2来说,云的输送是一个相当无效的过程,而液相清除起主要作用。硫酸盐气溶胶的收支分析表明,降水清除了1.67 mol的SO2-4,占气溶胶总量的64%,其中液态降水清除了0.72 mol,固态降水清除了0.95 mol,说明了冰相过程在硫沉降中的重要性。  相似文献