阳离子聚丙烯酰胺强化铝酸钠溶液种分附聚过程的机理

为了揭示阳离子聚丙烯酰胺强化铝酸钠溶液种分附聚过程的机理,采用硝酸钠作为外标物,用红外光谱法半定量检测种分附聚过程中各种铝酸根离子浓度的变化.结果表明:在种分附聚过程的前期,添加阳离子聚丙烯酰胺的铝酸钠溶液的峰值比Al(OH)4-/Al2O(OH)62-高于空白,但是在后期,其比值低于空白.在种分附聚过程的前期,添加阳离子聚丙烯酰胺的铝酸钠溶液的分解率一直低于空白,而在后期,其分解率一直高于空白.结合种分实验及红外光谱的结果,认为阳离子聚丙烯酰胺促进了铝酸钠溶液中Al(OH)4-→Al2O(OH)62-→Al(OH)3转化,从而强化了种分附聚过程.     

用作渣油降粘剂的丙烯酸酯类聚合物的合成及降粘性能研究

以丙烯酸异辛酯、丙烯酸十二酯、丙烯酸十六酯和丙烯酸十八酯为单体 ,用过氧化苯甲酰为引发剂 ,通过溶液聚合法 ,合成了 5种降粘剂。其中降粘剂丙烯酸十二酯—丙烯酸十六酯共聚物降粘效果最好。其添加量为 0 3%时 ,6 0℃下降粘率达 2 9 7% ;添加 0 9%时 ,6 0℃下的降粘率达 37 5 %。     

Preparation, characterization and photocatalytic behavior of WO3-TiO2/Nb2O5 catalysts

TiO2/Nb2O5 photocatalyst loaded with WO3 (WO3-TiO2/Nb2O5) was prepared by a modified hydrolysis process, and characterized by X-ray diffractometry, transmission electron microscopy, Raman spectra and UV-Vis diffuse refraction spectroscopy. The photocatalytic activity of WO3-TiO2/Nb2O5 was investigated by employing splitting of water for O2 evolution. The results indicate that WO3 loading can pronouncedly improve the photocatalytic activity of TiO2/Nb2O5 by using Fe3 as an electron acceptor under UV irradiation. The optimum molar fraction of the loaded WO3 is 2%, and the largest speed of O2 evolution for 2% WO3-TiO2/Nb2O5 catalyst is 151.8 μmol/(L·h).     

机械活化和氧化-还原处理对攀西钛铁矿精矿盐酸浸出的影响(英文)

研究机械活化和氧化-还原处理对攀西钛铁矿精矿盐酸浸出过程的影响。结果表明:机械活化和氧化-还原处理均可明显提高钛铁矿精矿中铁、钙和镁的浸出;氧化-还原处理的钛铁矿经盐酸浸出后得到的人造金红石,其钙镁含量过高,不能满足沸腾氯化法的要求;经机械活化处理的氧化-还原钛铁矿,能进一步降低盐酸浸出渣的钙镁含量,所得到的人造金红石含TiO290.50%、全铁1.37%、钙镁总量1.00%,完全满足沸腾氯化法的生产要求。最佳的氧化还原处理条件为:在900℃氧气气氛中氧化15min,在750℃氢气气氛中还原30min。     

ICP-AES测定铝土矿中低含量氧化钙—酸溶和碱熔预处理方法比较

废渣矿物组成较为复杂,并有较多玻璃质、微晶质和不同矿物的过渡相存在。废渣中锌主要分布在硅酸盐和锌铁尖晶石中;铅含量低,主要以铅矾形式存在;铁的主要物相为赤褐铁矿和硅酸铁;废渣含碳量高,烧失量较大。根据废渣含锌量及浸出毒性结果,将废渣分为两类处理。锌含量低且浸出毒性在国标规定范围的这一类废渣,金属回收价值不高,可作为建筑材料的原料(如水泥、混凝土及烧结砖)。另一类锌含量较高或浸出毒性超出国标规定范围的废渣,进行还原焙烧回收有价金属,90%以上的Zn和85%以上的Pb挥发进入烟尘,得到锌铅含量低且浸出毒性在国标规定范围的残渣,可用于建筑材料。     

短期负荷预测在无锡地区的应用

阐述了负荷预测在电力市场中的重要作用及负荷预测的一般过程,介绍了无锡地区负荷预测系统的算法原理、特点及解决的技术难点。指出负荷预测系统的算法全面、界面友好、操作方便、实用性强,是调度工作的得力助手。     

发生炉煤气水分夹带原因探讨

通过对生产过程的分析、测算,分析了冷煤气中夹带水分的主要原因,制定了相应的降低煤气中水分含量的整改措施,达到了预期目标。     

Mechanism of mechanical activation for sulfide ores

Structural changes for mechanically activated pyrite,sphalerite,galena and molybdenite with or without the exposure to ambient air,were systematically investigated using X-ray diffraction analysis(XRD),particle size analysis,gravimetrical method, X-ray photo-electron spectroscopy(XPS)and scanning electron microscopy(SEM),respectively.Based on the above structural changes for mechanically activated sulfide ores and related reports by other researchers,several qualitative rules of the mechanisms and the effects of mechanical activation for sulfide ores are obtained.For brittle sulfide ores with thermal instability,and incomplete cleavage plane or extremely incomplete cleavage plane,the mechanism of mechanical activation is that a great amount of surface reactive sites are formed during their mechanical activation.The effects of mechanical activation are apparent.For brittle sulfide ores with thermal instability,and complete cleavage plane,the mechanism of mechanical activation is that a great amount of surface reactive sites are formed,and lattice deformation happens during their mechanical activation.The effects of mechanical activation are apparent.For brittle sulfide ores with excellent thermal stability,and complete cleavage plane,the mechanism of mechanical activation is that lattice deformation happens during their mechanical activation.The effects of mechanical activation are apparent. For sulfide ores with high toughness,good thermal stability and very excellent complete cleavage plane,the mechanism of mechanical activation is that lattice deformation happens during their mechanical activation,but the lattice deformation ratio is very small.The effects of mechanical activation are worst.     

离心分离高岭土中铁钛杂质

用离心法脱除耒阳高岭土中铁，钛着色杂质的扩大试验表明，采用离心分离方法可有效地除去高岭土中的铁钛杂质，铁脱除率为３５．７％，钛脱除率为５６．４％，从而使高岭土白度显著提高。     

TBP对LIX84由Cu2+-NH3-Cl——H2O系萃取铜及氨的影响

以Cu2+-NH3-Cl--H2O氨性溶液为被萃水相,在LIX84中添加磷酸三丁酯(TBP),考察了有机相中TBP浓度、被萃水相铜离子浓度、总氨浓度和pH值及相比、LIX84浓度对铜萃取率、共萃氨量的影响. 结果表明,随LIX84中TBP浓度升高,铜萃取率变化不大,负载有机相的共萃氨量明显降低. 有机相中TBP浓度为0.1 mol/L、LIX84浓度为40%、被萃水相铜离子浓度25 g/L、总氨浓度3 mol/L及pH值9.1、相比1:1、萃取时间30 min时,铜萃取率约为81%,与未添加TBP时基本一致,而负载有机相的共萃氨量由未添加TBP时的260 mg/L降至添加TBP后的85 mg/L.