Advanced Materials Research Vols. 641-642

Abstract: Aiming at the petrochemical wastewater activated sludge system, using the Elman neural network modeling technology, through the improvement structure to improve the dynamic performance of the network, check and repair etc data preprocessing methods, combined with object characteristics selected input variable, construct the neural network model. The simulation results show that the neural network based on the activated sludge system model has good convergence and prediction accuracy, and can meet the control sewage treatment system reliable and stable operation of the engineering application demand.

Abstract: In the experiment a new photocatalyst AgBr/TiO₂ was prepared by modifying TiO₂ and was applied to degrade the organophosphorous pesticide wastewater . Some factors influencing the degradation were discussed. The results showed that the AgBr/TiO2 had higher photocatalytic activity; when the quality of photocatalyst was 1.2g, the initial concentration of the organophosphorous pesticide wastewater was 100mg/L, the PH was 11 and the degradation time was 100 minutes,the treatment effect of photocatalytic degradating organophosphorous pesticide wastewater was the best.

Abstract: Bi-doped TiO₂ was prepared with sol-gel method and was characterized by X-ray photoelectron spectroscopy (XPS). The photocatalytic degradation and kinetics of Methyl orange with Bi-doped TiO₂ under xenon lamp irradiation were investigated. The optimum conditions were as follows: the initial concentration of Methyl orange was 20 mg/L, the value of pH was 3.0 and the dosage of Bi-doped TiO₂ was 1.0 g/L. Under the optimal conditions, the decolorization rate of Methyl orange was 75.1 % and the kinetic constant was 0.0113 min-1.

Abstract: Hydrazine hydrate catalytic reduction (HHCR) is a green, eco-friendly method to reduce aromatic nitro compound to aromatic amine. Fe-Ni/C composite catalyst for HHCR was prepared. Preparation conditions of Fe-Ni/C composite catalyst were investigated taking o-chloronitrobenzene’s hydrazine hydrate catalytic reductions as the examples. Experimental results showed that the optimal conditions were as follows: preparation temperature is 50 °C, catalyst carrier is nitric acid treated activated carbon, w(Fe) is 5% and w(Ni) is 0.2%. During the preparation, ultrasonic treatment is also helpful to improve catalytic efficiency of Fe-Ni/C composite catalyst. The newly prepared Fe-Ni/C composite catalyst has combined the advantages of noble metal catalyst and iron-based catalyst and features good reduction selectivity and high catalytic efficiency.

Abstract: A rapid and sensitive cataluminescence (CTL)-based gas sensor using nanosized Y₂Zr_1.5O₆ as a probe was proposed for direct determination of ether in air. Trace ether was firstly absorbed on active carbon at room temperature to concentrate, then desorbed at 65°C to determine. The sensor showed high selectivity to ether at wavelength of 510nm, satisfying activity at temperature of 310°C and good stability at carrier flow rate of 110 ml/min. The linear range of CTL intensity versus concentration of ether was 2~100 mg/m³, and the detection limit (3σ) was 1.1 mg/m³. The recovery of artificial sample was 95.4%—106.7% by this method. The response to formaldehyde, benzene, NH₃ and ethanol was insignificant, and there was no response to SO₂, CO and acetone. The technique is a convenient and fast way of determining ether in air.

Abstract: According to the situation of high grade of flotation tailings in flotation process of SiJiYing Iron Mine, static-swirl micro-bubble flotation column was used in micro-fine hematite flotation tests. Tests on operation condition, reagent condition and flotation flowsheet were done. Compared with the flotation machine test, he final result was that concentrate grade was enhanced by 2.42%, recovery increased by 6.58%, and tailings grade was reduced by 2.01%,recovery rate reduced by 3.25%.Ideal beneficiation indexes were obtained.

Abstract: Two samples of mine drainage, named SY and XY respectively, were collected from Shimen Realgar Mine, Hunan province, China. In addition to physic-chemical analysis, bacterial diversities and community structures of these samples were described at genetic level by restricted fragment length polymorphisms (RFLP). A total of 66 and 76 different operational taxonomic units (OTUs) patterns were obtained from 160 clones respectively. Total 30 patterns, which were dominant or both appeared in these two samples, were re-amplified and sequenced. The sequence data and phylogenetic analysis showed that uncultured bacteria represented 62% of the population in samples due to the high concentration of arsenic. And almost all of the affiliated sequences have very close relationships with extreme environment. However, samples SY and XY contained more diverse colonies of bacteria. These diversities were characterized by the reciprocal of Simpson’s index (1/D).

Abstract: Abstract. The solubility of hydrogen in styrene-butadiene-styrene (SBS) block copolymer-cyclohexane solution was determined under 3, 6 and 10 MPa pressures and at temperatures from 50°C to 150°C respectively. The experimental results showed that the solubility of hydrogen increases with risen pressure, temperature as well as concentration of SBS polymer in the cyclohexane solvent. The measured data of gas solubility could be successfully correlated by PRSV equation of state.

Abstract: This article conducts mineral processing experimental study on a certain iron tailing ore in Hebei. According to the ore characteristics, the final flowsheet of stage grinding - weak magnetic - strong magnetic - anionic reverse flotation is determined to sort the ore. Under the conditions that grinding fineness is -200 mesh accounting for 60.0%, collector is butyl xanthate and activator is copper sulfate, this test can obtain zinc concentrate that grade is 36.25% and recovery is 84.15%

Abstract: The extraction of aluminum by the AlCl disproportionation process in vacuum was researched using the furnace designed by ourselves. The features of aluminum products were characterized by X-ray diffraction, scanning electronic microscope and energy-dispersive X-ray spectroscopy. The results indicated that the purity of aluminum products increased with decreasing condensation temperature; aluminum products could be oxidized as their size was too small; the residues of the extraction of aluminum from alumina could be further treated with this process to generate metallic aluminum with a little carbon; aluminum products with high Al₄C₃, C and Al₂O₃ impurities could be purified by this process. The conclusions could provide bases for the industrial application of the process.