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model of the copper concentrate reaction in the flash smelting furnace reaction shaft was proposed by treating the shaft interior space as a system where the concentrate and oxygen-rich air achieve local... tends to go down fast first and then slow with the fall of the concentrate in the reaction shaft, and the model calculated is in good agreement with the measured data, showing that the model can wholly......
magnetite concentrate, artificial magnetite with more lattice defects and higher activity tends to be oxidized. And the artificial magnetite pellet at the temperature of 400 °C has the oxidation degree approaching to natural magnetite concentrate pellet fired at 1000 °C. Besides, two kinds of pellets displayed quite different roasting characteristics. When preheated at the same temperature......
depressant, new reagent BPB as lead collector, CuSO4 as zinc activator and ethyl xanthate as zinc collector. The associated silver is mostly concentrated to the lead concentrate. With the process utilized in this work, a lead concentrate of 51.90% Pb with a recovery of 82.34% and a zinc concentrate of 56.96% Zn with a recovery of 81.98% are produced. The silver recovery in the lead concentrate is 80.61......
which were classified as a refractory sulphide gold concentrate, an easily leachable sulphide gold concentrate, and a low grade oxide gold ore according to their leaching characteristics. The results... leachable sulphide gold concentrates, and Pb2+ and Ag+ only had co-intensifying effect on the easily leachable sulphide gold concentrate. Key words: gold leaching; co-intensification; cyanidation......
on the crushing characteristics during impact crushing were investigated by mineral liberation analyzer (MLA) and drop weight test. The results show that both ores contain pyrrhotite, sphalerite, jamesonite... of cassiterite polymetallic sulfide ore are pyrrhotite and sphalerite; lead minerals are mainly jamesonite; antimony minerals are trace pyrite, natural antimony and pyrite; tin minerals are mainly......
Ti-O薄膜表面明胶接枝改性及其细胞相容性 王进1,黄楠1,陈俊英1,翁亚军1 (1.西南交通大学材料先进技术教育部重点实验室,人工器官表面工程四川省重点实验室,成都,610031) 摘要:进行 3-氨丙基膦酸(APP)在Ti-O薄膜表面的自组装并在其表面接枝明胶分子,研究了细胞相容性.结果表明,APP自组装的最佳温度为80℃,时间为4 h,自组装后水接触角降低,表面C,N元素含量提高;表面明胶在模拟体液中前4d有少量释放,之后体系稳定,稳定后表面明胶的有效密度为2.3μg/cm2.接枝改性后的Ti-O薄膜表面促进了内皮细胞的生长和增殖,提高了表面的细胞相容性. 关键词:材料表面与界面......
胆固醇改性聚硅氧烷的合成和血液相容性 计剑1,徐建平1,沈家骢1,王晓丽1 (1.浙江大学) 摘要:合成了胆固醇基团直接键合和通过长链烷基柔性链键合的胆固醇-聚硅氧烷接枝共聚物,研究了胆固醇改性聚硅氧烷的血液相容性.结果表明,未经长链烷基键合的共聚物不能形成液晶相,而经长链烷基键合的共聚物可以形成热致液晶.侧链液晶聚硅氧烷的液晶结构和材料的血液相容性具有独特的依赖性,热处理后形成的液晶相有助于提高材料的血液相容性. 关键词:有机高分子材料; 聚硅氧烷; 胆固醇; 液晶; 血液相容性; [全文内容正在添加中] ......
聚己内酯的表面光化学接枝改性以及细胞相容性 竺亚斌1,计剑1,沈家骢1,高长有1 (1.浙江大学) 摘要:采用紫外光氧化接枝的方法将亲水性的聚甲基丙烯酸(PMAA)接枝到聚己内酯(PCL)表面,用水溶性碳化二亚胺-1-二甲基胺丙基-3-乙基碳化二亚胺作为缩合剂在接枝膜表面固定了明胶,并用衰减全反射红外光谱(ATR-FTIR)和光电子能谱(XPS)对其表面进行了表征.测量了水相动态接触角,研究了细胞相容性.结果表明,经过改性后的PCL膜表面的亲水性显著提高,内皮细胞在改性PCL表面上培养96 h后的细胞增殖率和活性均有明显提高. 关键词:聚己内酯; 甲基丙烯酸; 光化学接枝; 内皮细胞;......
双酚A型二氰酸酯及其环氧改性体系的反应性研究 张增平1,梁国正1,任鹏刚2 (1.西北工业大学,理学院应用化学系,西安,710072;2.西安理工大学,印刷包装工程学院包装工程系,西安,710048) 摘要:采用两种不同环氧树脂与双酚A型二氰酸酯树脂(BADCy)进行共聚改性,应用DSC,FTIR对BADCy及其环氧改性体系的反应机理及产物结构进行了研究,结果发现,BADCy在固化过程中仅发生自聚反应并生成三嗪环.环氧改性氰酸酯体系在低温下(＜180℃)主要发生氰酸酯自聚,嗯唑啉酮的生成及少量环氧醚化反应,而在高温下(＞200℃)主要发生噁唑啉酮结构的转变及环氧基的插入反应,并最终生成噁......
纳米CaCO3改性及其在环氧改性丙烯酸底漆中的应用 蒋登高1,王训遒1 (1.郑州大学化工学院,郑州,450002) 摘要:采用复合改性剂对纳米CaCO3进行改性,探讨了改性剂用量,乳化温度,乳化时间和保温时间等因素对纳米CaCO3改性的影响,并优化了最佳操作工艺条件:改性剂用量为4.83%(质量分数)纳米CaCO3,乳化温度为80℃,乳化时间为40min和保温时间为60min.测定了改性和未改性纳米CaCO3的活化指数,吸油量,沉降体积及其在邻苯二甲酸二辛酯(DOP)中的糊粘度,并用红外光谱对改性和未改性纳米CaCO3进行了表征,结果表明改性纳米CaCO3的亲油性显著提高.制备了纳米C......
