光电化学冶金提取半导体元素——以碲为例

针对电化学冶金提取半导体元素存在的问题,提出采用光电化学冶金的方法来进行半导体元素的电化学沉积提取。结合半导体特性以及光电化学基本理论,阐述光电化学冶金的优势,并以碲提取为例验证光电化学冶金的优越性。结果表明:光电化学沉积过程中,半导体沉积物吸收能量大于其自身带隙宽度的光子后受激发产生光生电子-空穴对,光生电子从半导体流向电解液促进电化学还原,同时光生载流子可减小电阻率和能带弯曲,降低工作电极所分摊的电势差。与常规的电化学沉积相比,光电化学沉积可以强化电极过程、降低槽电压,以及提高沉积速率、电流效率和产能,具有良好的应用前景。最后指出光电化学冶金未来发展可能面临的问题,并对其内涵进行拓展。     

详述盐酸米诺环素脂质体的制备

目的考察盐酸米诺环索脂质体的制备工艺,测定脂质体的含量,并评价其质量。方法用薄膜分散法制备盐酸米诺环索脂质体,以包封率为指标,单因素优化制备工艺;以RP—HPLC测定盐酸米诺环索的含量。结果盐酸米诺环素脂质体最佳工艺为：药脂比1：30,PC—CH（8：1）,水化时间150rain,PBS体积10mL,PBS的pH6．5。平均包封率为76．5％士0．8％;平均粒径为103．2Ylm,PDI为0．211,Zeta电位为-16．5mV。结沦优化后的制备工艺可靠,可用于制备盐酸米诺环素脂质体。     

基于Domino技术的企业数据交换策略研究

随着网络技术的发展 ,企业加大了在信息基础设施方面的投入。由于历史的原因 ,企业数据一般由文件、关系型数据库、文档型数据库等构成。这些数据的共享与重用性差 ,数据之间的交换困难 ,不利于员工的使用和管理层的决策。提出了一种基于Domino技术的数据交换策略的体系结构 ,用来解决这类问题。这种结构的核心是数据接口和中间件 ,即中间件技术的应用。详细地描述了中间件技术结构设计的四个主要组成部分 :请求管理模块、连接管理模块、操作管理及评价模块、结果缓冲集 ,并提出了在实际应用中系统设计的一种可行的开发工具。     

铝电解自焙炭阳极的电催化节能

本文在实验室条件下研究了铝电解中掺杂Ｌｉ、Ｌｉ＋Ｂａ、Ｍｇ＋Ｆｅ盐的石墨电极对阳极反应的电催化作用，发现这些掺杂电极能显著降低炭阳极反应的过电压。工业应用表明。该项技术给自焙铝电解槽带来了巨大的节能增产效益，开避了高温熔盐电解节能的新领域     

Preparation of spherical cobalt carbonate powder with high tap density

1 INTRODUCTION Cobalt carbonate is an important intermediate products for preparing battery-grade Co3O4 by liquid chemical precipitation-thermal decomposition method[1?5]. The crystallization and density of cobalt carbonate have an immediate effect on electrochemistry performance of Co3O4. So, it is very important to prepare cobalt carbonate with high density and good crystallization. In the process of preparing cobalt carbonate by liquid chemical precipitation method, it is very easy to…     

Preparation of activated carbons from mesophase pitch and their electrochemical properties

The influences of molar ratio of KOH to C and activated temperature on the pore structure and electrochemical property of porous activated carbon from mesophase pitch activated by KOH were investigated. The surface areas and the pore structures of activated carbons were analyzed by nitrogen adsorption, and the electrochemical properties of the activated carbons were studied using two-electrode capacitors in organic electrolyte. The results indicate that the maximum surface area of 3 190 m2/g is obtained at molar ratio of KOH to C of 5:1, the maximum specific capacitance of 122 F/g is attained at molar ratio of KOH to C of 4:1, and 800 ℃ is the proper temperature to obtain the maximum surface area and capacitance.     

强化烧结法生产氧化铝新工艺的研究与实践

针对我国铝土矿资源特点和我国烧结法生产氧化铝的现状,论述了强化烧结法生产氧化铝新工艺.采用铝硅比为9.62的矿石,按照钙比为1.3～2.O,碱比为1进行配料,在1250℃以上进行熟料烧成.实验结果显示:烧成的熟料溶出条件宽松,二次反应程度弱;溶出浆液在170℃左右直接进行加压脱硅,脱硅后溶液的硅量指数大于200,再加入适量的石灰进行深度脱硅,即使溶液中氧化铝浓度超过200 g/L时,精液的硅量指数也大于600,且得到的水化石榴石中二氧化硅饱和系数大于O.28;通过加入晶种和采用新的碳酸化分解工艺制度,产品中的SiO2含量降至O.025%,Na2O含量小于O.37%;加入表面活性剂,不仅能将碳分母液蒸发至Na2OT浓度大于300 g/L,而且还可有效减缓表面上结疤的形成速度.部分结果已应用于工业实践中,单台窑产能提高了1 9.7%,工艺能耗降低了24.71%.     

CaO掺杂10NiO-NiFe2O4复合陶瓷的导电性能

研究添加剂CaO含量和烧结温度对CaO掺杂10NiO-NiFe2O4复合陶瓷的物相组成和电导率的影响。结果表明:CaO含量在0~4%范围内,烧结试样的X射线衍射谱仅有NiO和NiFe2O4的衍射峰;10NiO-NiFe2O4复合陶瓷在空气中升温过程存在明显的吸氧和失氧行为;CaO含量对1 473 K烧结的10NiO-NiFe2O4复合陶瓷的电导率影响显著;当CaO含量为0~1%时,随测试温度的升高,材料电导率逐渐增大,随后在773~923 K出现1~2个数量级的突降,然后重新缓慢增大;当CaO含量为2%和4%(质量分数,下同)时,材料电导率在298~1 233 K范围内随着测试温度的升高而增大;2?O掺杂10NiO-NiFe2O4复合陶瓷在不同测试温度下均具备最高电导率,1 233 K下达到16.29 S/cm,远高于未掺杂试样的1.03 S/cm;烧结温度由1 473 K提高到1 573 K时,未掺杂试样在1 233 K时电导率提高近15倍,2?O掺杂试样1 233 K时电导率略有提高。     

Electrical resistivity of NiFe_2O_4 ceramic and NiFe_2O_4 based cermets

NiFe2O4 ceramic and NiFe2O4 based cermets, expected to be used as the inert anodes in aluminum electrolysis, were prepared and their electrical resistivities were measured at different temperatures. The effects of temperature and composition on their electrical resistivities were investigated. The results indicate that the electrical resistivities of NiFe2O4 based cermets mainly depend on temperature, resistivity of ceramic matrix, composition and dispersion of the metal phase among ceramic matrix. The electrical resistivity of NiFe2O4 ceramic decreases from 10. 094 Ω · cm to 0. 475 Ω · em with increasing temperature from 573 K to 1 233 K. The electrical resistivities of NiFe2O4 based cermets are greatly lowered, but decrease with increasing the temperature with similar trend compared to that of NiFe2O4 ceramic. The resistivities of NiFe2O4 based cermets containing 5 % Ni, 5 % Cu and 5 % CuNi alloy are 0. 046 8, 0.066 8 and 0. 0532 Ω · cm at 1 233 K, respectively, which are all acceptable as inert anode materials compared to that of the current carbon anode used for aluminum electrolysis.     

聚铝沟排布对导流型铝电解槽热应力分布的影响

为了优化导流型铝电解槽聚铝沟设计方案,对槽内热应力分布特征进行研究分析。采用商用有限元计算软件ANSYS针对两种聚铝沟设计方案（即方案Ⅰ为工字型聚铝沟结构;方案Ⅱ为单聚铝沟结构）的导流槽模型进行了电-热-应力耦合计算,同时针对热应力引起的槽体形变进行模拟。结果表明：采用方案Ⅰ工字型聚铝沟结构时,槽体内部热应力较大,尤其是两端靠近横向聚铝沟的阴极炭块内部具有较大的应力集中,而采用方案Ⅱ单聚铝沟结构时,该处的应力集中得到了较好的缓和,槽体形变较小。