One-step scalable preparation of graphene nanosheets and high-thermal-conductivity flexible graphene films

It is well known that graphene nanosheets (GNSs) have many excellent properties. However, it has been a difficult thing to exfoliate graphite into GNSs in a controllable and scalable manner. In this research, a new strategy named xylitol-assisted ball milling exfoliation (XABME) was developed for the scalable preparation of GNSs. The experimental results characterized by a series of measurements showed that GNSs were successfully exfoliated by the XABME strategy. The structure of the prepared nanosheets was featured by large lateral size and ultra-small thickness. Furthermore, the prepared GNSs easily achieved high production yield (≈54%). Lastly, the as-obtained GNSs and cellulose nanofibers (CNF) were compounded to form some nanomaterial films. The prepared films exhibited excellent flexibility and higher thermal conductivity, with the in-plane thermal conductivity of 90 wt% GNS film (8.0 W/(m·K)) being 11.4 times higher than that of the film without GNSs. This shows that GNSs could effectively enhance the thermal conductivity of the CNF matrix and indicate that these prepared films have great potentials in the thermal management of portable mobile devices.     

VO2-ZnO composite films with enhanced thermochromic properties for smart windows

VO₂ film is a promising thermochromic material in smart windows due to its reversible metal to insulator transition (MIT) accompanied with an abrupt change of transmittance in near-infrared region at around 68 °C (T>68 °C, translucent; T < 68 °C, transparent), but which has not been widely applied because its low luminous transmittance (<60%) and solar modulation efficiency (<10%) are difficult to be improved simultaneously. In order to solve this problem, the ZnO-VO₂ composite film was prepared by a facile method, in which commercial ZnO nanoparticles (NPs) and VO₂ micro-particles were mixed by ball milling method to form the composites. By introducing ZnO NPs into the composite film, the luminous transmittance (T_lum) of the composite film was increased by 16.9% (from 54.9% to 63.9%) and the solar modulation efficiency (ΔT_sol) was increased by 14.1% (from 9.9% to 11.3%) compared to the pure VO₂ composite film. This was because ZnO NPs not only played the role of antireflection, but also prevented VO₂ particles from agglomeration by dispersing around VO₂ particles. Furthermore, the two-layered film based on ZnO-VO₂ composites exhibited an astonishing ΔT_sol of 18.8%, while maintaining excellent T_lum of 54.3%. This work could provide a simple and novel idea for us to improve the thermochromic properties of VO₂ films and simultaneously to promote their practical application.     

球磨机筒体变形修复与衬板改造

介绍了采取阶梯挖补修复球磨机筒体变形及改变衬板形状的具体情况 ,改造后使用效果较好     

对W.B.B.商品用球粘土注浆性能的研究

本采用XRD,DTA－TG,沉降法颗粒分析,粘土－水系统流动性,触变性和Zeta电位测定,试样干燥强度,干燥收缩和烧成收缩测定等手段对WBB清远华建陶瓷厂矿物有限公司生产的卫生瓷专用球粘土的化学组成,矿物组成,颗粒组成及工艺性能进行了系统的研究,结果表明该球粘土性能优良,完全适用于卫生瓷注浆成型工艺,有利于提高成型性能和生坯强度,有利于提高生产效率和产品质量。     

高效快速纤维球过滤器的应用

介绍了纤维球过滤器的特点、工作原理及其在脱盐水装置中的应用效果。     

Relationships between Bond's grindability (Gbg) and breakage parameters of grinding kinetic on limestone

The grindability of a material is the only factor used to determine the required size of a grinding machine. Although, Bond's grindabilty test is widely used to the estimate power required of an industrial grinding mill. Recently, kinetic model has been mostly used to the design of grinding circuits.In this study, the relationship between the Bond's grindability (G_bg) and breakage parameters (S_i, a_T, γ and β) were examined. The validity of the obtained relationship parameters of S_i, a_T, γ and β has been confirmed with correlation coefficients of 0.96, 0.92, 0.90 and 0.78, respectively, through a regression analysis of samples of limestone.     

改性双基球形药的制备工艺研究

介绍了改性双基球形药的悬浮法制备工艺,探讨了增能物质含量及其改性物质的粉碎程度对球形药假密度和粒径的影响,并对溶剂用量、脱水剂浓度及驱溶速度的影响进行了讨论。     

高温氧气用金属硬密封球阀的研究与设计

介绍了高温氧气用金属硬密封球阀的原理与结构特点,阐述了其设计重点和生产控制过程。     

Modeling and simulation of a fully air swept ball mill in a raw material grinding circuit

A raw material grinding circuit was modeled using plant data. Samples were collected from around the circuit and, following a crash stop, from inside the mill. The size distributions of the samples were determined down to a few microns. Using the data from inside the mill a modeling approach, based on perfect mixing, was developed. The modelling approach implicitly assumes that the mixture of feed materials broken is homogenous from the breakage point of view. The air classification around the circuit was modeled using the efficiency curve approach. In order to measure the success of the method the circuit performance was predicted by simulation studies while it was operating at different conditions. The results were then compared with the measured data. It is concluded that modeling gives a useful quantitative indication of what may occur in fully air swept mills.