Advanced Materials Research Vols. 347-353

Abstract: The influence of melting process on heavy metal speciation was studied. The results show that although there are different changes of heavy metals Cd, Cu, Mn and Zn after melting process, percentage of residue is increasing and others are decreasing. Before melting process, Pb exists mainly in carbonate, Fe-Mn oxide and organic matter bound fractions and in Fe-Mn oxide bound fraction after the process. The percentage distribution of Cr, As, Ba and Ni are not changed obviously before and after melting. In general, the existence forms of all testing heavy metals trend to more stable speciation after melting process.

Abstract: The purpose of this paper is to study the anti-corrosion properties of a novel pre-treatment CeO2/ZrO2 nanometric film coating on the surface of cold-rolled plate at room temperature. A novel coating agents involved elements Zr,Ce and additional surfactants were prepared and used in the field of cold-rolled plate pretreatment. The surface of the coating sample was investigated by using X-ray Photon Spectrum (XPS), X-ray Diffraction (XRD) and Scanning Electronic Microscope (SEM)，respectively. The Ce3+ doted ZrO2 nanofilm could improve the anti-corrosion performance of coated plate. This dipping coating process satisfied the energy-saving and green chemistry requirement of modern cold-rolled plate pre-treatment technology.

Abstract: The effects of process parameters of biomass grain size (ranging from 0.425 to 3.35mm), rotational speed (ranging from 20 to 60rpm) and the pyrolysis temperature (ranging from 400 to 550 oC) on the yield of bio-oil were investigated in this study by using a fast pyrolysis reactor with a single tapered screw extruder. This study gives the optimal pyrolysis temperatures and rotational speeds for different grain sizes to achieve peak bio-oil yield. The results indicate that higher feed rates are required for larger grain sizes to achieve peak bio-oil yields. For instance, a 20rpm rotational speed is for 0.425~1.18mm grain sizes (50~57% bio-oil yield), while a 40rpm rotational speed is for 1.7~3.35mm grain sizes (56~60% bio-oil yield). This implies that the productivity of bio-oil can be significantly increased in the current system. For the case of 2.5~3.35mm grain size, which corresponds to an optimal rotational speed of 40rpm, the production rate was estimated to be around 4kg/h.

Abstract: Recovering valuable metal from tailings has always been one of national resource comprehensive utilization key research subjects. There are copper-bearing magnetite which contains 43.31% of iron and 0.21% of copper in some places. After grinding-low intensity magnetic separation-flotation process can get 68.87% of iron concentrate with recovery 64.39% and copper concentrate which contain copper 12.67% with recovery of 75.30%. The experiment results will provide an effective way to comprehensive utilize the resource in one area.

Abstract: Smelting slag, a solid industrial waste, has become a major environmental pollution in Baoshan, Shanghai. This thesis makes a detailed analysis of categories, components and functions of smeling slag and puts forward approaches to treatment of steel slag waste in Baoshan District against situations in Bao Steel and its affiliates in hopes of contributing to the improvement of Shanghai’s environment.

Abstract: Elemental research of burning blended coal of Indonesia Lignite and Vietnam anthracite on a face-fired 600MW supercritical boiler is performed, which is original designed for burning high-quality bituminous coal. Maximum ratio of Vietnam anthracite can be 40 percent. With the increase of the ratio of the anthracite, the size of residue particles and the ratio of unburned carbon in residues (UBCRs) rise up markedly, the slag formation of Indonesia Lignite alleviate. The results reveal: the burnout of anthracite is more difficult than its ignition, the key way to solve this problem is to control Fineness of Pulverized Coal Powder (FPCP) of the blended coal according requirements of anthracite, but to control the Primary Air (PA) outlet temperature of mill and the mass ratio of PA to coal as flammable coal Lignite. Besides, Secondary Air (SA) Distribution mode of Centralized Oxygen Feeding(COF), Big Swirl Intensity also have obvious effects the combustion of blended coal.

Abstract: The performance of Salt-gradient solar ponds (SGSP) with and without the solar collector are investigated experimentally in this paper. Two mini solar ponds with same structure are built, and one the them is appended with an exceptive solar collector for compared study. The salinity, temperature and turbidity of solar pond are studied contrastively for the two solar ponds under the same ambient conditions. The ambient temperatures,humidity and solar radiation are investigated during the experimental period. It was found that the temperature of the lower convective zone in the solar pond coupled with a solar collector increases by about 20% due to the introduce of solar collector.

Abstract: With the widening application of solar PV power generation, a way of solar utilization, the safe operation of PV power generation system is increasingly valued. To assure the operating safety and reliability of PV power plant, monitoring system has to be installed to identify and eliminate faults of the plant immediately. Solar remote monitoring system in the architecture of internet of things (IoT) is comprised of sensing layer, information transmission layer and application layer. The sensing layer consists of sensors for monitoring environment, PV module and inverter; the information transmission layer consists of ZigBee access unit, access network, WEB server and Internet; and the application layer consists of IoT application fault diagnosis module. The remote monitoring system provides scientific decision-making reference to the safe operation and daily maintenance and management of PV power generation system through data acquisition, fusion, analysis and evaluation.

Abstract: Based on the high mining height of large cutting height workface in shallow thick coal seam and the few falling waste rock in goaf, the key roof can not be supported effectively, the facture mechanical model of key roof was established. The theoretical calculation formula of key stratum fracture step and working resistance of support were obtained by using fracture mechanics. The results show that the fracture step of key roof relate to not only the mechanical character of key roof and the load of overlaying rock seam, but also the working resistance of support and horizontal pressure in key roof. The reasonable working resistance of support and the step of roof fracture were analyzed in 1-2coalmine 51104 face of a mine in Dongsheng area. The theoretical results are well agreeable with the field measured results.

Abstract: This experiment was conducted to evaluate the effect of ensiling on fermentation quality and aerobic stability of a total mixed ration (TMR) containing wet brewers’ grains and corn straw. During the ensiling period, pH fell dramatically from 6.00 to 3.92 at the initial 3 days, then it maintained relatively stable. Lactic acid concentration firstly increased rapidly then it became slowly to reach 3.21% at day 28 post-ensiling. No propionic acid or butyric acid was observed throughout the ensiling. When exposed to air, the temperature of TMR increased quickly to reach a maximum of about 45°C at the 6-day, then it tended to decline until day 9. Later, it had another relative low peak at the 10-day, then it dropped slowly to be equal to air temperature. For TMR silage, no heat production or mold were detected in the entire period. In addition, during the days of exposure, the pH for TMR varied from 6.0-8.7, while TMR silages had no significant differences (3.86 to 3.87). The number of lactic acid bacteria (LAB) for the TMR decreased from the initial 3.2×10³ cfu g^-1 to below detectable levels and yeast counts increased by 1000 times. However, the TMR silage had no significant change in LAB and yeast counts. These results indicated that the TMR silage showed great quality and aerobic stability. Overall, fermentation plays an important part in helping total mixed ration silage forming a good aerobic stability.