Advanced Materials Research Vols. 396-398

Abstract: The technologies of ion exchange resin for ultra pure hydrogen peroxide production are more and more focused. The aim of this research was to determine suitable parameters for effective removal of Na+ impurities from aqueous hydrogen peroxide solution to produce ultra pure hydrogen peroxide. Dynamic experiments for the different operation conditions, i.e., initial concentration, flow rate, ratio of height to diameter were carried out. The concentrations of Na+ of the effluents from the ion exchange resin column were determined by ICPS-7510.The breakthrough curves of Na+ were measured and analyzed. The results shown that Na+ could be reduced effectively from the experimental aqueous hydrogen peroxide solution with the fitting conditions of ion exchange resin column, which provided the basis for determining of the suitable operating conditions of ion exchange column of a pilot plant.

Abstract: Cytochrome C is bio-oxidation process of electron transfer in vitro. Effects are similar to Coenzyme. The role is similar to coenzyme. In the case of enzymes, it can promote on oxidation and reduction as a rapid enzymatic action. In this study, Cytochrome C extraction method is discussed. By discussing the way of extracting Cytochrome C, the better methodology of extracting material and technique has been found.

Abstract: Layer-by-layer self-assembly technology has been widely used and developed recently. However, most assembly was directly carried out using polyamions and polycations which is simply based on electrostatic force. In this work, a coordination multilayer with PS ultrafiltration (UF) membrane as substrate was explored by the alternate deposition of a transition-metal-containing polyelectrolyte and a ligand-containing polymer via the formation of complexes. Desalination experiments showed that for single salt solution filtration, the prepared metal-ligand-coordinated multilayer membrane has a 85% rejection of Na2SO4 and a solution flux of 60 L/m2h at 1.0MPa, while the rejection of NaCl was only 20% and the solution flux was about 85 L/m2h at the same pressure. Continuous test indicated that the performance of the membrane is basically unchanged during the two weeks, so the prepared membrane has excellent stability and resistance to swelling.

Abstract: In this work, the extraction of astaxanthin i.e. bioactive substance in the shrimp head and shell was studied. The extraction method of astaxanthin was established: the alkali method and organic solvents method were combined to extract astaxanthin, the solvent of the alkali solution was ethanol:water =4:1, dichloromethane was selected as the extractant. The best extraction conditions for astaxanthin were optimized: the concentration of sodium hydroxide was 1.4mol / L, the optimum extaction process was at 54°C for 24 h, and the ration of solid to liquid was 8:1. In this condition, the absorption value of astaxanthin was 1.2048, the concentration of astaxanthin was 3.26μg/mL, which was equivalent to 32.6 μg/g dry shrimp shell.

Abstract: The crystal structure models of three kinds of different Al(OH)3 crystals, which are gibbsite, bayerite and nordstradite, are built respectively according to the corresponding experimental crystal lattice. Geometry optimizations are implemented by CASTEP program module using general gradient approximation (GGA) and local density approximation (LDA) methods respectively based on density functional theory (DFT). Total energy, electronic structure, atomic and bond populations are also calculated. The calculation results of total energy indicate that gibbsite is steadier than the other two from the point of view of energy, and the effect of basis set of GGA-PW91 is highest. At the same time, energy bond structure and density of states calculated at GGA-PW91 and LDA-CA-PZ levels show that the different of energy gap ΔE (ELUMO-EHOMO) at the first group of BZ is not obvious, and that the highest value of ΔE of gibbsite is more lower than the other two Al(OH)3 crystals. It may be likely to say that gibbsite may be more active than the other two crystals. According to the analysis of populations, it can be found that bond populations value of H-O and Al-O bonds of gibbsite is smallest in three different Al(OH)3 crystals, it is to say that the combination force of H-O and Al-O bonds of gibbsite is smallest and gibbsite may be more easier to be calcined theoretically.

Abstract: In this work, it was aimed to select and propose a feasible as well as an applicable method, or series of methods for the extraction of zinc. After determination of the components of the residue, water leaching, acid leaching and roasting-leaching were performed to reclaim Zn. Roasting-leaching was found to be effectively for Zn extraction by controlling acid mass, roasting duration and temperature as parameters. At the optimum conditions, 0.7 times the amount of H2SO4 at 250 °C for 150 min in roasting, 82.05% of initial Zn content was extracted.

Abstract: Hydrothermal sulfidation of pure white lead with elemental sulfur has been studied in the present paper. The variables considered in the study were temperature, time, particle size and elemental sulfur fraction in the reacting mixture. Temperature and time were the most two important factors, with an increase in temperature and holding time the sulfidation extent of lead improved greatly and the constituent of products changed a lot. At temperatures above 140°C, PbS and PbSO4 were the only stable reaction products in the sulfidation of white lead. The experimental data indicated that under the hydrothermal conditions with a particle size of -58+48 μm and sulfur fraction in reacting mixture of 8% at 140 °C for 90 min, and 86% of lead sulfidation extent was achieved.

Abstract: Arsenic contamination of water and associated health risks have been reported in many regions of China. Leaching of arsenic from industrial wastewater into groundwater may cause severe contamination, which requires proper treatment before its emission. Therefore, sulfur dioxide reduction combined diffusion dialysis method is adopted to dispose the wastewater containing high concentration of copper and arsenic. Effects of the sulfur dioxide reduction process of the flow of sulfur dioxide, reaction time, reaction temperature and stirring speed and the diffusion dialysis process of the influent acidity, water flow velocity and material flow velocity on the ratio of separation of arsenic and copper were studied in this paper. The results show that on the conditions of the flow of sulfur dioxide of 3 kg/h, reaction time of 1h, at room temperature, stirring speed of 800 r/min and influent acidity of 5 g/L, water flow velocity of 400 ml/h, material flow velocity of 400 ml/h, the integrated effect of separation is best. The separation ratio of copper reaches 94.71 % and that of arsenic is up to 95.63 %.

Abstract: The hydrodynamics in a gas-solid draft tube-lifted air-loop reactor (GSALR) was investigated systematically using experimental measurements. To demonstrate the gas-solid flow pattern, the upward particle velocity, downward particle velocity and time-averaged particle velocity in four regions of the GSALR were measured by optical fiber probe under different superficial gas velocities. The experimental results show that the downward particle velocity distributes uniformly along the radius in the four regions, but the radial distributions of upward particle velocity and time-averaged particle velocity are core-annulus or heterogeneous structure in the three regions (distributor affect region, draft tube, gas-solid diffluence region), which have the common feature of aggregative fluidization occurred in normal fluidized beds. The operating condition such as superficial gas velocity in draft tube has different effects on the radial distributions of upward particle velocity, downward particle velocity and time-averaged particle velocity in each region. Analysis of the distributions of upward particle velocity, downward particle velocity and time-averaged particle velocity leads to suggestions regarding optimization of the design and provides further theoretical basis for industry application of GSALR.

Abstract: China’s mine enterprises have gradually advanced towards the direction of collectivize and large-scale development, which requires continuous improvement and innovation on safety management. Based on the actual situation of safety management in China’s mine enterprises, this paper gave a general analysis of three principles in mine enterprises as material-oriented safety management, humanistic safety management and heart-oriented safety management and their adaptation in practice, as well as their limitations, and at last, it put forward a scientific implementation method. In addition, this paper discussed a model of Tri-intrinsic safety management which integrates three ideological principals of material-oriented safety management, humanistic safety management and heart-oriented safety management into mine enterprises. Based on Marxism theory on law of social and human development, Tri-intrinsic safety management is devoted to achieve the unification of safety values of employees and enterprises, the unification of people’s health and safety, as well as ego-development and production efficiency. Meanwhile, this model complied with the development trend of safety management in China’s mine enterprises, which can promote safety management of mine enterprises to a new level of development.