刚果(金)高泥氧化铜矿的絮凝沉降试验研究及技改应用

本文以刚果(金)高泥氧化铜浸出矿浆为试验对象,进行了有机高分子聚丙烯酰胺的选型试验,探究了最佳沉降效果下浸出矿浆浓度、絮凝剂种类和用量等参数指标,再针对浓密机结构进行优化改造,并取得了较好的效果。结果表明：选择1800-2300万分子量的AN905型的絮凝剂,能满足高泥氧化铜矿的生产浓缩作业要求；根据沉降试验,生产浸出矿浆浓度为20%,絮凝剂作用的沉降效果最佳,单耗为100g/吨矿；改造浓密机中心筒高度、改变絮凝剂投加方式和调整絮凝剂添加点,能有效解决高泥氧化铜浸出矿浆在浓缩过程中的絮凝沉降问题,减少有价金属量的溢流损失,降低絮凝剂用量,进一步提高生产矿石处理量,实现企业良好的经济效益。     

The Effect of Antibacterial Particle Incorporation on the Mechanical Properties,Biodegradability, and Biocompatibility of PLA and PHBV Composites

The composites based on polylactide (PLA) and poly (3‐hydroxybutyrate‐co‐3‐hydroxyvalerate) (PHBV) with the addition of antibacterial particles: silver (Ag) and copper oxide (CuO) are characterized. Basic mechanical properties and biodegradation processes, as well as biocompatibility of materials with human cells are determined. The addition of Ag or CuO to the polymers do not significantly affect their mechanical properties, flammability, or biodegradation rate. However, several differences between the base materials are observed. PLA‐based composites have higher tensile and impact strength values, while PHBV‐based ones have a higher modulus of elasticity, as well as better mechanical properties at elevated temperatures. Concerning biocompatibility, each of the tested materials support the growth of fibroblasts over time, although large differences are observed in the initial cell attachment. The analysis of hydrolytic degradation effects on the structure of materials shows that PHBV degrades much faster than PLA. The results of this study confirm the good potential of the investigated biodegradable polymer composites with antibacterial particles for future biomedical applications.     

机械合金化FeS/Cu复合材料的摩擦磨损性能

以FeS和CuSn8Ni1粉末为原料，利用机械合金化技术和粉末冶金技术制备了FeS/Cu复合材料，探讨了不同载荷情况下所制备的FeS/Cu复合材料的摩擦学性能及润滑膜与转移膜特征。结果表明：机械合金化提高了FeS与铜合金基体界面结合性能，进而提高了材料减摩耐磨性能；当载荷较小时，摩擦副表面接触不稳定，复合转移膜不连续，摩擦因数波动大；载荷较大时，复合转移膜易破损，材料的减摩耐磨性能变差；当载荷为150 N时，载荷适宜，材料表面软化，复合转移膜更加完整，摩擦因数较小。     

铜电解精炼添加剂生产实践与精细化管理探索

添加剂是铜电解精炼生产管理的最关键要素,合适的添加剂使用方案可以有效保障电解生产系统长期稳定。结合添加剂生产实践和其它电解厂添加剂管理优点,提出探索添加剂精细化管理,进一步保障和提升铜电解添加剂管理实效。     

优化作业方式提高始极片质量

针对某厂铜电解种板工序存在的始极片质量波动较大的问题,从种板系统体积控制和添加剂匹配的角度出发,分析各种因素对始极片质量的影响,做出了相应的改进措施,使种板系统运行更加稳定,始极片质量得到进一步提升。     

浅谈不同给液方式在铜电解车间的应用

不同给液方式对铜电解过程中有重要的影响,不同的循环方式会影响槽内温度分布、电解液成分及阳极泥沉降等,因此,根据铜电解生产不同情况的需要,分析对比了多种给液方式在贵冶电解车间的应用,总结了这几种给液方式的优缺点和适用条件。     

浅谈压延铜箔光面色差的成因

针对压延铜箔在表面处理过程中光面易出现色差的问题,从设备、工艺、人员操作等方面进行成因探讨,并给出了应对措施。     

Preparation of a Near-Infrared Ray Absorption Film from N-Phenylthiocarbamoyl Chitosan Derivative

We recently observed that the decanoylation of N-phenylthiocarbamoyl chitosan (2) with a mixture of decanoic anhydride and pyridine at 60 °C for 24 h afforded N,N-(decanoyl)phenythiocarbamoyl-/2-isothiocynato chitosan decanoate (3b) rather than the expected product N,N-(decanoyl)phenylthiocarbamoyl chitosan decanoate (3a). This result suggested that some of the N,N-(decanoyl)phenylthiocarmbamoyl groups had been converted to isothiocyanate groups during the decanoylation process. The subsequent reaction of compound 3b with aniline gave N,N-(decanoyl)phenylthiocarbamoyl/N-phenylthiocarbamoyl chitosan decanoate (4) in high yield. A solution of compound 4 in CHCl₃ was then added to a solution of copper decanoate (5) in the same solvent, and the resulting mixture was cast onto a glass plate to give a cast film. The film was annealed at 200 °C in an oven to give a greenish film, which showed good near-infrared absorption characteristic in the range of 800–2200 nm.     

A nanosystem of copper(II)-disulfiram for cancer treatment with high efficacy and few side effects

Developing chemotherapy drugs with high efficacy and few side effects has been a bottleneck problem that requires an efficient solution. The active cancer treatment ingredient disulfiram (DSF), inspired by the copper(II) diethyldithiocarbamate complex (CuET), can be used in a one-pot synthesis method to construct a CuET delivery nanosystem (CuET-ZIF_Cu@HA). Due to the high biocompatibility, targeting of CD44 overexpressed cancer cells, and acid response of zeolitic imidazolate framework (ZIF) materials of hyaluronic acid (HA), we realized that CuET-ZIF_Cu@HA could become an effective and highly selective cancer treatment. Both in vivo and in vitro experiments have demonstrated that CuET-ZIF_Cu@HA has robust anti-tumor properties without evident side effects. This research provided a promising strategy for DSF nanosystems that involves simple preparation and high efficacy, both of which are key to reusing DSF in cancer treatment.