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贵州某高硫铝土矿中硫的溶出及影响因素 被引量:3
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作者 张念炳 黎志英 丁彤 《有色金属工程》 CAS CSCD 北大核心 2012年第5期33-35,共3页
研究贵州某高硫铝土矿硫的溶出和影响因素。结果表明,在高硫铝土矿溶出时,解离的黄铁矿先溶出,被铝土矿包裹的黄铁矿在氧化铝溶出后期才溶出,且溶出量较小。硫溶出率受黄铁矿粒度、解离度、溶液成分和溶出条件等因素的影响。
关键词 铝土矿 黄铁矿 解离度
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高硫铝土矿溶出过程中硫的行为研究 被引量:29
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作者 张念炳 蒋宏石 吴贤熙 《轻金属》 CSCD 北大核心 2007年第7期7-10,共4页
本文研究了高硫型高品位铝土矿溶出过程中硫的行为,考查了石灰添加量、溶出温度、苛性碱浓度和溶出时间对铝土矿中硫溶出率的影响。实验结果表明,在溶出高硫铝土矿时,硫溶出率最小的最佳条件是:温度240℃,碱浓度195g/l,时间50min,石灰... 本文研究了高硫型高品位铝土矿溶出过程中硫的行为,考查了石灰添加量、溶出温度、苛性碱浓度和溶出时间对铝土矿中硫溶出率的影响。实验结果表明,在溶出高硫铝土矿时,硫溶出率最小的最佳条件是:温度240℃,碱浓度195g/l,时间50min,石灰添加量CaO16%。此时,硫的溶出率仅为7.05%,同时又能保证氧化铝溶出率不低于81%。处理高硫型高品位铝土矿时,需要综合考虑影响氧化铝溶出率的各方面因素,既要保证高的氧化铝溶出率,又要取得较低的硫溶出率。从而减轻硫进入溶液所导致的除硫负担,减少脱硫剂用量,降低除硫费用。 展开更多
关键词 型高品位铝土矿 氧化铝
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贵州高硫高品位铝土矿硫溶出性能研究 被引量:2
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作者 黎志英 《贵州大学学报(自然科学版)》 2009年第4期63-65,共3页
对不同硫含量的贵州高硫铝土矿硫的溶出率进行了研究。在铝土矿硫含量一定的条件下,考查石灰添加量、溶出温度、苛性碱浓度和溶出时间等对硫的溶出率的影响,得出对硫溶出率影响较大的影响因素。实验结果表明,中等硫含量的高硫铝土矿能... 对不同硫含量的贵州高硫铝土矿硫的溶出率进行了研究。在铝土矿硫含量一定的条件下,考查石灰添加量、溶出温度、苛性碱浓度和溶出时间等对硫的溶出率的影响,得出对硫溶出率影响较大的影响因素。实验结果表明,中等硫含量的高硫铝土矿能得到较低硫溶出率,较适宜的溶出条件为溶出温度260℃,碱浓度195 g/l,石灰添加量CaO12%,时间50 min. 展开更多
关键词 高品位铝土矿 出性能
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高硫高有机物型黑灰铝土矿溶出特性研究 被引量:3
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作者 李桂兰 林齐 方建川 《轻金属》 CSCD 北大核心 2010年第8期9-11,16,共4页
对具有代表性的高硫不含有机物、高硫并携带有机物的两种黑灰铝土矿溶出特性进行了研究,考察了它们在高压溶出过程中硫、有机物和氧化铝溶出率概况,以及溶出温度、碱浓度、石灰添加量等因素的影响,为开发黑灰铝土矿脱硫脱有机物净化技术... 对具有代表性的高硫不含有机物、高硫并携带有机物的两种黑灰铝土矿溶出特性进行了研究,考察了它们在高压溶出过程中硫、有机物和氧化铝溶出率概况,以及溶出温度、碱浓度、石灰添加量等因素的影响,为开发黑灰铝土矿脱硫脱有机物净化技术,使其能直接用于拜耳系统提供了初始数据。 展开更多
关键词 黑灰铝土矿 有机物 出特性
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渤海某油田硫垢问题治理的研究
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作者 宋晓莉 尤秋彦 +3 位作者 牛心蕙 周立山 滕大勇 赵新星 《天然气与石油》 2018年第6期37-41,共5页
针对渤海某油田在脱硫过程中产生的严重硫垢沉积问题,以二甲基二硫醚(DMDS)为主剂,加入氢氧化钠(NaOH)、二甲基甲酰胺(DMF)和水进行复配得到复合硫溶剂,研究组分配比、药剂用量、溶解温度、溶解时间对溶硫率的影响,得出复合硫溶剂的最... 针对渤海某油田在脱硫过程中产生的严重硫垢沉积问题,以二甲基二硫醚(DMDS)为主剂,加入氢氧化钠(NaOH)、二甲基甲酰胺(DMF)和水进行复配得到复合硫溶剂,研究组分配比、药剂用量、溶解温度、溶解时间对溶硫率的影响,得出复合硫溶剂的最佳配比DMDS∶NaOH∶DMF∶水=1∶2∶4∶3,治理硫垢的最佳条件:药剂用量为硫垢重量的20倍,溶解温度为45℃,溶解时间为50 min,在此条件下,溶硫率可达到100%。现场条件模拟实验证实了该硫溶剂具有优异的除硫性能。 展开更多
关键词 复合 溶硫率 性能
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Pressure leaching of bismuth sulfide concentrate containing molybdenum and tungsten in alkaline solution 被引量:3
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作者 张杜超 杨天足 +1 位作者 刘伟锋 吴江华 《Journal of Central South University》 SCIE EI CAS 2012年第12期3390-3395,共6页
The leaching results of bismuth sulfide concentrate containing molybdenum and tungsten in air-H2O2-NaOH system, pressure-O2-Na2CO3 system and pressure-O2-NaOH system were investigated. The results show that the extrac... The leaching results of bismuth sulfide concentrate containing molybdenum and tungsten in air-H2O2-NaOH system, pressure-O2-Na2CO3 system and pressure-O2-NaOH system were investigated. The results show that the extraction of molybdenum, tungsten and sulfur goes up with the increase of NaOH concentration, oxygen partial pressure and reaction time. The extraction of molybdenum and tungsten also rises up with temperature, but the leaching ratio of sulfur increases initially to a peak of 98% at 150℃ and then decreases with the increase of temperature. Under the optimal conditions, the extraction of molybdenum, tungsten and sulfur is more than 95.6%, 93.8% and 96.0%, respectively, and the main phases of residue are Bi2O3 and Fe2O3. Therefore, the method of pressure leaching in alkaline solution is provided as an effective separation of molybdenum, tungsten and sulfur from bismuth and a beneficial pretreatment for consequent process. 展开更多
关键词 bismuth sulfide concentrate MOLYBDENUM TUNGSTEN pressure leaching sodium hydroxide
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Chemical dissolution resistance of anodic oxide layers formed on aluminum 被引量:5
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作者 W.BENSALAH M.FEKI +1 位作者 M.WERY H.F.AYEDI 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2011年第7期1673-1679,共7页
Chemically resistant anodic oxide layers were formed on pure aluminum substrates in oxalic acid-sulphuric acid bath.Acid dissolution tests of the obtained anodic layers were achieved in accordance with the ASTM B 680-... Chemically resistant anodic oxide layers were formed on pure aluminum substrates in oxalic acid-sulphuric acid bath.Acid dissolution tests of the obtained anodic layers were achieved in accordance with the ASTM B 680-80 specifications:35mL/L 85% H3PO4+20g/L CrO3 at 38℃.Influence of oxalic acid concentration,bath temperature and anodic current density on dissolution rate and coating ratio was examined,when the sulphuric acid concentration was maintained at 160g/L.It was found that chemically resistant and compact oxide layers were produced under low operational temperature (5℃) and high current densities (3A/dm^2).A beneficial effect was observed concerning the addition of oxalic acid (18g/L).The morphology and the composition of the anodic oxide layer were examined by scanning electron microscopy (SEM),atomic force microscopy (AFM) and glow-discharge optical emission spectroscopy (GDOES). 展开更多
关键词 ALUMINUM anodic oxide layer oxalic acid-sulphuric anodization dissolution rate coating ratio
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Rapid Regeneration of Chelated Iron Desulfurization Solution Using Electrochemical Reactor with Rotating Cylindrical Electrodes 被引量:1
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作者 于永 刘有智 祁贵生 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2014年第2期136-140,共5页
A new electrochemical reactor with rotating cylindrical electrodes was designed and used to increase the regeneration efficiency of chelated iron desulfurization solution.The influence of operating parameters,such as ... A new electrochemical reactor with rotating cylindrical electrodes was designed and used to increase the regeneration efficiency of chelated iron desulfurization solution.The influence of operating parameters,such as the rotation speed of electrode,voltage,and inlet air and liquid flow rates,on the regeneration rate was investigated.Compared with the traditional tank-type reactor,the regeneration rate with the new electrochemical reactor was increased significantly.Under the optimum conditions,the regeneration rate was increased from 45.3%to 84.8%.Experimental results of continuous operation indicated that the new electrochemical regeneration method had some merits including higher regeneration efficiency,smaller equipment size and good stability in operation. 展开更多
关键词 regeneration^desulfurization chelated iron ELECTROCHEMISTRY reactor
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Mechanism study on the effect of different surfactants on dissolution rate of recrystallized prednisolone in various concentrations
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作者 Soheyla Honary Pouneh Ebrahimi Mohammad Alimohamadi 《Journal of Chemistry and Chemical Engineering》 2009年第6期54-62,共9页
The effects of re-crystallization of prednisolone as a poorly water-soluble drug in aqueous surfactant solutions on its dissolution rate were investigated. A significant enhancement was observed for crystal dissolutio... The effects of re-crystallization of prednisolone as a poorly water-soluble drug in aqueous surfactant solutions on its dissolution rate were investigated. A significant enhancement was observed for crystal dissolution rate in hydrophilic surfactants such as tween 80 and sodium lauryl sulfate (SLS). Differential scanning calorimetry (DSC) and Fourier transform infrared spectroscopy (FT-IR) indicated the existence of both form Ⅰ and Ⅱ ofprednisolone in SLS treated crystals. The FT-IR results also showed that, only form Ⅱ could be detected in prednisolone crystals without surfactant and prednisolone form Ⅲ was produced in tween 80 treated crystals. These results were also confirmed by X-ray (XRD) diffraction and scanning electron microscopy (SEM). In general, the results indicated that the presence of hydrophilic surfactants could generate forms Ⅱ and Ⅲ of the crystals. These forms would give rlse to the increase of prednisolone's dissolution rate owing to their physicochemical instability and more hydrophilic property in comparison with stable polymorph of form Ⅰ. 展开更多
关键词 PREDNISOLONE POLYMORPHISM dissolution rate SURFACTANT
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