Technological and Kinetic Study for Oxidation Pretreatment Process of Copper-bearing Refractory Gold Concentrate under Atmospheric Pressure

随着高品位、易选冶金矿资源的日益减少，如何开发利用复杂难处理金矿资源已成为亟需解决的重要课题。因传统火法冶金工艺的高能耗与高污染等问题日益凸显，湿法冶金技术成为了当前研究与应用的热点。对于难处理含铜金矿，湿法冶金的关键是将影响提金的含铜矿物分解浸出（称之为氧化预处理）。目前的研究绝大多数集中在热压浸出与生物浸出预处理方法上，而常压化学氧化预处理过程的研究相对较少。 本文中采用硫酸–氧介质于常压条件下对主要含黄铜矿与黄铁矿的铜金精矿进行氧化预处理，全面考察了铜金精矿氧化浸出工艺参数的影响并优化了工艺条件；系统研究了氧化浸出过程宏观动力学；深入分析了氧化浸出过程若干机理；初步探索了难处理金精矿中...With dwindling reserves of high grade and easily workable gold mineral resources, recovery of gold from deposits with complex mineralogy has emerged as an important subject which needs to be solved urgently. Recently, out of energy and environmental consideration, focus is being shifted from the conventional roasting processes to the hydrometallurgical systems. With regard to the hydrometallurgy o...学位：工学博士院系专业：化学化工学院化学工程与生物工程系_工业催化学号：2062008015014

饲用二甲酸钾的研究进展

抗生素自20 世纪50 年代应用于养殖业以来，极大 地促进了养殖业生产的快速发展。但抗生素的长期使用， 往往会引发动物体内产生耐药菌株，并导致药物残留。 因此，抗生素促生长剂的使用逐渐受到限制甚至禁止， 欧盟已于2006 年1 月全面禁止在饲料中使用抗生素促生 长剂。二甲酸钾是欧盟批准使用的第一种用于替代抗生 素促生长剂的饲料添加剂。二甲酸钾由于其具有优良的 抑菌促长性，且具有很好的安全性，成为理想的替代抗 生素促生长剂的绿色饲料添加剂。此文系统介绍了饲用 二甲酸钾的研究进展，并对其中存在的主要问题及发展 前景进行了简要的评述。厦门大学创新性实验计划资助项

Preparation of potassium diformate by methyl formate and potassium hydroxide

联系人：李清彪. 第一作者：詹国武（1986—），男，学士.[中文文摘]本研究采用甲酸甲酯、氢氧化钾、甲酸为原料，一步反应制备二甲酸钾。系统地考察了影响产品收率的主要因素，优化了工艺条件，结果表明，当n(MF)/n(KOH)=1.20，n(HCOOH)/n(KOH)=1.44，反应时间为30min，反应温度为55℃时，二甲酸钾产品收率可达 98.8%。产品经红外光谱分析及成分测定，符合质量标准。[英文文摘]In this study, methyl formate, potassium hydroxide and formic acid were used as raw materials for one-step synthesis of potassium diformate. The main factors affecting the quality and yield of product were investigated. The optimal conditions for reaction were: molar ratio of MF to KOH 1.20:1, molar ratio of HCOOH to KOH 1.44:1, reaction time 30 min and reaction temperature 55℃. The product met the quality standard of potassium diformate after infrared spectrum analysis and composition determination.厦门大学创新性实验计划资助项

Biosynthesis of Silver Nanoparticles from Various Medicinal Plant Extracts and Their Antibacterial Properties

作者简介:林源(1985－)，女，硕士研究生。联系人:李清彪(1963－),教授，博士生导师，电话:0592－ 2189595，E－mail:kelqb@xmu．[中文摘要]分别以中草药丁香、山茱萸、地榆和乌梅的提取液为还原剂和保护剂合成银纳米颗粒,利用紫外-可见吸收光谱(UV-vis)、透射电镜(TEM)以及X射线粉末衍射(XRD)对产物进行了表征。结果表明,所得银纳米颗粒呈近球形,提高提取液的pH有利于获得粒径较小、分散性好、稳定性高的银纳米颗粒。进一步考察制得的银纳米颗粒的抗菌性能,结果表明,其对大肠杆菌和金黄色葡萄球菌有很强的抑制作用,最小抑菌质量浓度(M IC)分别可达1.69和3.38 mg/L。[英文摘要]Quasi-spherical silver nanoparticles(AgNPs) were synthesized from the extracts of different medicinal plants including Syzygium aromaticum,Cornus officinalis,Prunus mume and Sanguisorba officinalis,and were subsequently characterized by means of UV-visible spectroscopy,transmission electron microscopy and X-ray diffraction.When pH values of the extracts were adjusted to 10,the biosynthesized AgNPs were well-dispersed,highly stable,and relatively small in size.Thus obtained AgNPs were found to demonstrate good antibacterial activity against Escherichia coli and Staphylococcus aureus，with minimum inhibitory concentrations of 1.69 and 3.38 mg /L required，respectively．国家自然科学基金重点项目(21036004);国家自然科学基金面上项目(20976146);福建省科技计划重点项目(2009H0041

基于并行小种群差分进化算法的水火电力系统短期优化调度

为解决水火电力系统短期发电优化调度中存在的问题,提出基于MPI平台的并行小种群差分进化算法。该算法将进化种群分为若干个小种群(单个种群规模为3~10个),每个进化种群由不同的CPU进程独立执行差分进化算法,并在种群间引入集合、分散操作以协调各小种群的寻优过程;为降低小种群初始化和进化过程中多样性的损失,引入正交化初始化方法和种群重构技术;最后以典型案例验证了算法的有效性。结果表明,该方法在求解精度、收敛速度和求解耗时上均较有竞争力。国家自然科学基金项目(61403321);;广东省自然科学基金项目(2014A030310003

Green Synthesis of Potassium Diformate

以甲酸和氢氧化钾为原料,不外加任何溶剂一步合成二甲酸钾。通过单因素实验,考察了原料配比、反应温度和反应时间对产品质量与收率的影响。采用正交实验进一步优化了合成工艺,确定了最佳工艺条件:n(HCOOH)/n(KOH)=2.2、反应温度70℃、反应时间30 m in,在该条件下,二甲酸钾产品收率达98%以上。所得产品经红外光谱分析及熔点测定,其结果与文献报道一致。反应过程绿色化,有很好的原子经济性。Potassium diformate was synthesized without solvent,using formic acid and potassium hydroxide as raw materials.The optimal conditions for the reaction were:molar ratio of HCOOH to KOH 2.2∶1,reaction temperature 70 ℃ and reaction time 30 min.Yield of the process was over 98% under the optimal conditions.The infrared spectrum and melting range of the product were in good agreement with those reported in literature.The technology developed in this study could be an environmentally benign synthesis route with efficient atom economy

Effects of Aqueous Extracts of Coptis Chinensis Franch and Prunus Mume on Intestinal Bacteria in Vitro

通过滤纸片法初步测定了黄连和乌梅水提液的抗菌性能,用比浊法进一步考察了它们对5种肠道菌体外生长的影响。结果表明,0.001 g/mL黄连和乌梅水提液均能够有效抑制产气荚膜梭菌和金黄色葡萄球菌的生长,轻微促进干酪乳杆菌的生长,但对嗜酸乳杆菌的生长只有微弱的抑制作用。0.01 g/mL黄连水提液对大肠杆菌的生长影响不大。而0.001 g/mL乌梅水提液可促进大肠杆菌的生长,但当质量浓度升高至0.005 g/mL时,则对大肠杆菌的生长表现出抑制作用。因此,黄连、乌梅水提液可能是潜在的益生元,是功能性食品配料、绿色饲料添加剂的候选者。The effects of aqueous extracts from C.chinensis Franch root(Coptis root)-derived and P.mume fruit-derived materials on the growth of intestinal bacteria were examined firstly by using impregnated paper disk method,and further by using spectrophotometric method.Both Coptis root and P.mume extracts exhibited potent inhibition against Clostridium perfringens and Staphylococcus aureus at mass concentration as low as 0.001 g/mL,whereas only weak inhibitory activity was detected against Lactobacillus acidophilus.Moreover,growth of Lactobacillus casei was slightly promoted by both extracts at the same mass concentration.No inhibition against Escherichia coli was observed from treatment with Coptis root extracts even at 0.01 g/mL.On the contrary,P.mume extracts showed slight stimulation effects on the growth of E.coli at 0.001 g/mL,but exhibited significant growth inhibition at 0.005 g/mL.These results indicated that Coptis extracts and P.mume extracts may be potential prebiotics,and could be alternatives for functional food additives and green feed additives

Biosynthesis of Silver Nanoparticles Using Extract of Pichia Pastoris

侍者简介:洪露薇(1987一) .女，本科生，李消彪(1963一) .男，博士，数授，博士生导师，通讯联系人. E-mail: [email protected][中文文摘]采用毕赤酵母的提取液与银氨溶液反应制备银纳米颗粒(AgNPs),并考察了pH值对AgNPs的影响。结果表明:酸性条件下,反应速率缓慢,且生成的AgNPs呈多分散性;在一定范围内(pH值小于12.50),碱性条件有利于提高反应速率,且随着pH值的提高,AgNPs粒径分布变窄;当pH值继续提高(pH值为12.80),AgNPs发生团聚沉淀。[英文文摘]The Ag nanoparticles(AgNPs) were synthesized by the extract of Pichia pastoris,a non-pathogenic yeast,and the effects of pH on the reaction were investigated.The results showed that under acidic condition the reaction rate was slow and the AgNPs were polydisperse.When pH was below 12.50,the reaction rate increased with the increasing of pH and the distribution of the particle size was narrow;when pH reached 12.80 or above 12.80,aggregation of AgNPs appeared.国家高技术研究发展计划(2007AA03Z347);国家自然科学基金(20776120);福建省自然科学基金(2008J0169