含砷难处理金精矿的催化氧化酸浸（COAL）新工艺开发

介绍了催化氧化酸浸（COAL）新工艺开发及产业化的情况,该工艺可以在100 ℃及0.4 MPa氧分压条件下对含砷金矿进行处理,金和银的回收率都可达到92%～96%。较低的工业压力和温度使设备简单、易于开工,基建投资和维修操作费用均较传统加压浸出工艺明显降低。在小型试验基础上,开发出100 m3加压浸出反应釜,并在招远金矿建成了100 t/d的工业试验及生产厂,工业试验证实金和银回收率分别为 93%～95%和 92%～96%,与小型试验结果一致。在操作参数及设备形式调整后,本工艺亦可适用于高砷高碳金精矿的处理。     

尿酸转运蛋白研究进展

体内尿酸经肾脏转运时需依赖肾小管上皮细胞上的转运蛋白。现已明确有4种尿酸盐转运蛋白参与了人近曲肾小管对尿酸盐的转运:即负责尿酸重吸收的尿酸盐阴离子转运体1(hURAT1),及负责尿酸分泌的尿酸盐转运体(UAT)和有机阴离子转运体(OAT1和OAT3)。最近,又发现了一种负责将尿酸分泌到细胞外,参与肾脏近曲小管对尿酸盐的重吸收的转运蛋白--葡萄糖转运蛋白9(GLUT9)。本文对尿酸转运蛋白的特点、功能及调节机制进行综述。     

酸受体对氯醚橡胶性能的影响

考察了几种酸受体(ZnO,MgO,CaO,PbO,Pb3O4)与1,2-亚乙基硫脲(NA-22)组成的硫化体系对氯醚橡胶性能的影响。结果表明,加入酸受体后,硫化胶的邵尔A型硬度、拉伸强度、100％定伸应力和压缩永久变形提高,其中以添加PbO,Pb3O4的效果最为显著。含ZnO硫化胶的耐热氧稳定性较差,而含CaO,PbO,Pb3O4硫化胶的耐热氧稳定性良好,且添加PbO,Pb3O4的效果最佳。除ZnO外,其他酸受体均使硫化胶的起始热分解温度和微分热重分析(DTG)峰值对应的温度提高,350℃时的热失重率减小,而含ZnO硫化胶的起始热分解温度虽提高,但DTG峰值温度降低,350℃时的热失重率增大。     

膨润土酸溶解特性研究

本文进行了膨润土与硫酸的反应特性实验研究,考察了膨润土中Ca^2＋、Mg^2＋、K^＋、Na^＋、Al^3＋离子在不同条件下的溶出特征。结果表明：膨润土中不同位置的阳离子溶出特征不同．层间阳离子溶出属一般的物理交换变化,不涉及化学键的断裂,温度的变化对其溶出量无影响;结构中的阳离子的溶出实质是化学变化过程．受溶解反应活化能的控制,温度的升高有利于离子的溶出。     

One-step synthesis of ?-caprolactam via the liquid phase catalytic nitrosation of cyclohexane in the presence of concentrated sulfuric acid

A simple and efficient approach for the synthesis of ?-caprolactam via the liquid phase nitrosation of cyclohexane and nitrosyl sulfuric acid in the presence of concentrated sulfuric acid has been developed. A series of novel AlVPO composites were prepared by an impregnation method and the composites were then employed to catalyze the nitrosation reaction of cyclohexane and nitrosyl sulfuric acid. Compared to the reaction using fuming sulfuric acid, the selectivity for the desired product was significantly improved using this one-step catalytic process. This method affords a shortcut to prepare ?-caprolactam and its analogs from cyclohexane.     

A preliminary study of the electro-oxidation of l-ascorbic acid on polycrystalline silver in alkaline solution

Electrochemical oxidation of l-ascorbic acid on polycrystalline silver in alkaline aqueous solutions is studied by cyclic voltammetry (CV), chronoamperometry (CA) and impedance spectroscopy (IS). The anodic electro-oxidation starts at −500 mV versus SCE and shows continued anodic oxidation in the cathodic half cycle in the CV regime signifying slowly oxidizing adsorbates. Diffusion coefficient of ascorbate ion measured under both voltammetric regimes is around 1.4 × 10⁻⁵ cm² s⁻¹. Impedance spectroscopy measures the capacitances associated with double layer and adsorption around 50 μF cm⁻² and 4 mF cm⁻² as well as the adsorption and decomposition resistances (rates).     

A study on lithium/air secondary batteries—Stability of NASICON-type glass ceramics in acid solutions

The stability of a NASICON-type lithium ion conducting solid electrolyte, Li_1+x+yTi_2−xAl_xP_3−ySi_yO₁₂ (LTAP), in acetic acid and formic acid solutions was examined. XRD patterns of the LTAP powders immersed in 100% acetic acid and formic acid at 50 °C for 4 months showed no change as compared to the pristine LTAP. However, the electrical conductivity of LTAP drastically decreased. On the other hand, no significant electrical conductivity change of LTAP immersed in lithium formate saturated formic acid-water solution was observed, and the electrical conductivity of LTAP immersed in lithium acetate saturated acetic acid-water increased. Cyclic voltammogram tests suggested that acetic acid was stable up to a high potential, but formic acid decomposed under the decomposition potential of water. The acetic acid solution was considered to be a candidate for the active material in the air electrode of lithium-air rechargeable batteries. The cell reaction was considered as 2Li + 2 CH₃COOH + 1/2O₂ = 2CH₃COOLi + H₂O. The energy density of this lithium-air system is calculated to be 1477 Wh kg⁻¹ from the weights of Li and CH₃COOH, and an observed open-circuit voltage of 3.69 V.     

Electrosysnthesis of poly(aniline-co-m-amino benzoic acid) for corrosion protection of steel

Conducting polymer (poly(aniline-co-m-amino benzoic acid)) has been deposited on steel surface by cyclic voltammetric technique. The copolymer film was characterized by FTIR, XPS and SEM techniques. The corrosion protection performance of copolymer film on steel was found out by impedance and tafel polarization methods in 1N HCl. The copolymer film was found to be highly corrosion resistant.     

匀浆抽提油料中油脂的初步研究

本文使用分散机匀浆,利用溶剂提取油料中的油脂,再经减压旋蒸除掉溶剂,得到油脂。通过对所得油脂的含量,酸价及过氧化值的测定,评价该方法的可行性。     

猪苍白肌游离氨基酸简易测定

运用简易测定方法,了解苍白肌中游离氨基酸的消长.